diff --git a/streaming_form_data/_parser.c b/streaming_form_data/_parser.c
index ed2ca24a..0297b28f 100644
--- a/streaming_form_data/_parser.c
+++ b/streaming_form_data/_parser.c
@@ -1486,21 +1486,22 @@ enum __pyx_t_19streaming_form_data_7_parser_FinderState {
   __pyx_e_19streaming_form_data_7_parser_FS_END
 };
 
-/* "streaming_form_data/_parser.pyx":28
- * # 300..399: problems with parsing particular part headers
- * # 400..499: problems with unregistered parts
- * cpdef enum ErrorGroup:             # <<<<<<<<<<<<<<
- *     Internal = 100
- *     Delimiting = 200
- */
-enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup {
-  __pyx_e_19streaming_form_data_7_parser_Internal = 0x64,
-  __pyx_e_19streaming_form_data_7_parser_Delimiting = 0xC8,
-  __pyx_e_19streaming_form_data_7_parser_PartHeaders = 0x12C,
-  __pyx_e_19streaming_form_data_7_parser_UnexpectedPart = 0x190
+/* "streaming_form_data/_parser.pyx":24
+ * 
+ * 
+ * cpdef enum ErrorCode:             # <<<<<<<<<<<<<<
+ *     """
+ *     Error codes returned by the parser
+ */
+enum __pyx_t_19streaming_form_data_7_parser_ErrorCode {
+  __pyx_e_19streaming_form_data_7_parser_E_OK,
+  __pyx_e_19streaming_form_data_7_parser_E_INTERNAL,
+  __pyx_e_19streaming_form_data_7_parser_E_DELIMITING,
+  __pyx_e_19streaming_form_data_7_parser_E_PART_HEADERS,
+  __pyx_e_19streaming_form_data_7_parser_E_UNEXPECTED_PART
 };
 
-/* "streaming_form_data/_parser.pyx":162
+/* "streaming_form_data/_parser.pyx":45
  * 
  * 
  * cdef enum ParserState:             # <<<<<<<<<<<<<<
@@ -1522,7 +1523,7 @@ enum __pyx_t_19streaming_form_data_7_parser_ParserState {
   __pyx_e_19streaming_form_data_7_parser_PS_ERROR
 };
 
-/* "streaming_form_data/_parser.pyx":35
+/* "streaming_form_data/_parser.pyx":65
  * 
  * 
  * cdef class Finder:             # <<<<<<<<<<<<<<
@@ -1540,7 +1541,7 @@ struct __pyx_obj_19streaming_form_data_7_parser_Finder {
 };
 
 
-/* "streaming_form_data/_parser.pyx":92
+/* "streaming_form_data/_parser.pyx":122
  * 
  * 
  * cdef class Part:             # <<<<<<<<<<<<<<
@@ -1554,7 +1555,7 @@ struct __pyx_obj_19streaming_form_data_7_parser_Part {
 };
 
 
-/* "streaming_form_data/_parser.pyx":127
+/* "streaming_form_data/_parser.pyx":157
  * 
  * 
  * cdef class AsyncPart:             # <<<<<<<<<<<<<<
@@ -1568,7 +1569,7 @@ struct __pyx_obj_19streaming_form_data_7_parser_AsyncPart {
 };
 
 
-/* "streaming_form_data/_parser.pyx":182
+/* "streaming_form_data/_parser.pyx":192
  * 
  * 
  * cdef class _Parser:             # <<<<<<<<<<<<<<
@@ -1592,7 +1593,7 @@ struct __pyx_obj_19streaming_form_data_7_parser__Parser {
 };
 
 
-/* "streaming_form_data/_parser.pyx":149
+/* "streaming_form_data/_parser.pyx":179
  *             target.multipart_content_type = value
  * 
  *     async def start(self):             # <<<<<<<<<<<<<<
@@ -1608,7 +1609,7 @@ struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct__start {
 };
 
 
-/* "streaming_form_data/_parser.pyx":153
+/* "streaming_form_data/_parser.pyx":183
  *             await target.start()
  * 
  *     async def data_received(self, bytes chunk):             # <<<<<<<<<<<<<<
@@ -1625,7 +1626,7 @@ struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct_1_data_receiv
 };
 
 
-/* "streaming_form_data/_parser.pyx":157
+/* "streaming_form_data/_parser.pyx":187
  *             await target.data_received(chunk)
  * 
  *     async def finish(self):             # <<<<<<<<<<<<<<
@@ -1641,7 +1642,7 @@ struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct_2_finish {
 };
 
 
-/* "streaming_form_data/_parser.pyx":229
+/* "streaming_form_data/_parser.pyx":239
  *         self.active_part.start()
  * 
  *     async def async_set_active_part(self, part, str filename):             # <<<<<<<<<<<<<<
@@ -1656,7 +1657,7 @@ struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct_3_async_set_a
 };
 
 
-/* "streaming_form_data/_parser.pyx":239
+/* "streaming_form_data/_parser.pyx":249
  *         self.active_part = None
  * 
  *     async def async_unset_active_part(self):             # <<<<<<<<<<<<<<
@@ -1669,7 +1670,7 @@ struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct_4_async_unset
 };
 
 
-/* "streaming_form_data/_parser.pyx":248
+/* "streaming_form_data/_parser.pyx":258
  *             self.active_part.data_received(value)
  * 
  *     async def async_on_body(self, bytes value):             # <<<<<<<<<<<<<<
@@ -1683,12 +1684,12 @@ struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct_5_async_on_bo
 };
 
 
-/* "streaming_form_data/_parser.pyx":268
+/* "streaming_form_data/_parser.pyx":278
  *         return self._parse(chunk, index)
  * 
  *     async def async_data_received(self, bytes data):             # <<<<<<<<<<<<<<
  *         if not data:
- *             return 0
+ *             return ErrorCode.E_OK
  */
 struct __pyx_obj_19streaming_form_data_7_parser___pyx_scope_struct_6_async_data_received {
   PyObject_HEAD
@@ -1712,7 +1713,7 @@ struct __pyx_obj___Pyx_EnumMeta {
 
 
 
-/* "streaming_form_data/_parser.pyx":35
+/* "streaming_form_data/_parser.pyx":65
  * 
  * 
  * cdef class Finder:             # <<<<<<<<<<<<<<
@@ -1731,7 +1732,7 @@ struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder {
 static struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *__pyx_vtabptr_19streaming_form_data_7_parser_Finder;
 
 
-/* "streaming_form_data/_parser.pyx":182
+/* "streaming_form_data/_parser.pyx":192
  * 
  * 
  * cdef class _Parser:             # <<<<<<<<<<<<<<
@@ -2698,7 +2699,7 @@ static CYTHON_INLINE PyObject* __Pyx_PyInt_From_unsigned_char(unsigned char valu
 static CYTHON_INLINE PyObject* __Pyx_PyInt_From_long(long value);
 
 /* CIntToPy.proto */
-static CYTHON_INLINE PyObject* __Pyx_PyInt_From_enum____pyx_t_19streaming_form_data_7_parser_ErrorGroup(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup value);
+static CYTHON_INLINE PyObject* __Pyx_PyInt_From_enum____pyx_t_19streaming_form_data_7_parser_ErrorCode(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode value);
 
 /* CIntToPy.proto */
 static CYTHON_INLINE PyObject* __Pyx_PyInt_From_int(int value);
@@ -2768,7 +2769,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser___pyx_unpickle_Finder__s
 static PyObject *__pyx_f_19streaming_form_data_7_parser___pyx_unpickle_Part__set_state(struct __pyx_obj_19streaming_form_data_7_parser_Part *, PyObject *); /*proto*/
 static PyObject *__pyx_f_19streaming_form_data_7_parser___pyx_unpickle_AsyncPart__set_state(struct __pyx_obj_19streaming_form_data_7_parser_AsyncPart *, PyObject *); /*proto*/
 static PyObject *__pyx_f_19streaming_form_data_7_parser___pyx_unpickle__Parser__set_state(struct __pyx_obj_19streaming_form_data_7_parser__Parser *, PyObject *); /*proto*/
-static PyObject *__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup); /*proto*/
+static PyObject *__Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode); /*proto*/
 static PyObject *__pyx_unpickle___Pyx_EnumMeta__set_state(struct __pyx_obj___Pyx_EnumMeta *, PyObject *); /*proto*/
 /* #### Code section: typeinfo ### */
 /* #### Code section: before_global_var ### */
@@ -2795,6 +2796,7 @@ static const char __pyx_k_new[] = "__new__";
 static const char __pyx_k_res[] = "res";
 static const char __pyx_k_s_s[] = "%s.%s";
 static const char __pyx_k_str[] = "__str__";
+static const char __pyx_k_E_OK[] = "E_OK";
 static const char __pyx_k_HTTP[] = "HTTP";
 static const char __pyx_k_Part[] = "Part";
 static const char __pyx_k_args[] = "args";
@@ -2854,7 +2856,6 @@ static const char __pyx_k_parents[] = "parents";
 static const char __pyx_k_prepare[] = "__prepare__";
 static const char __pyx_k_EnumBase[] = "EnumBase";
 static const char __pyx_k_EnumType[] = "EnumType";
-static const char __pyx_k_Internal[] = "Internal";
 static const char __pyx_k_Parser_2[] = "_Parser";
 static const char __pyx_k_filename[] = "filename";
 static const char __pyx_k_getstate[] = "__getstate__";
@@ -2868,6 +2869,7 @@ static const char __pyx_k_register[] = "register";
 static const char __pyx_k_set_name[] = "__set_name__";
 static const char __pyx_k_setstate[] = "__setstate__";
 static const char __pyx_k_AsyncPart[] = "AsyncPart";
+static const char __pyx_k_ErrorCode[] = "ErrorCode";
 static const char __pyx_k_chunk_len[] = "chunk_len";
 static const char __pyx_k_chunk_ptr[] = "chunk_ptr";
 static const char __pyx_k_delimiter[] = "delimiter";
@@ -2876,8 +2878,7 @@ static const char __pyx_k_isenabled[] = "isenabled";
 static const char __pyx_k_metaclass[] = "__metaclass__";
 static const char __pyx_k_pyx_state[] = "__pyx_state";
 static const char __pyx_k_reduce_ex[] = "__reduce_ex__";
-static const char __pyx_k_Delimiting[] = "Delimiting";
-static const char __pyx_k_ErrorGroup[] = "ErrorGroup";
+static const char __pyx_k_E_INTERNAL[] = "E_INTERNAL";
 static const char __pyx_k_NullTarget[] = "NullTarget";
 static const char __pyx_k_Part_start[] = "Part.start";
 static const char __pyx_k_ValueError[] = "ValueError";
@@ -2887,12 +2888,12 @@ static const char __pyx_k_pyx_vtable[] = "__pyx_vtable__";
 static const char __pyx_k_skip_count[] = "skip_count";
 static const char __pyx_k_Finder_feed[] = "Finder.feed";
 static const char __pyx_k_OrderedDict[] = "OrderedDict";
-static const char __pyx_k_PartHeaders[] = "PartHeaders";
 static const char __pyx_k_Part_finish[] = "Part.finish";
 static const char __pyx_k_PickleError[] = "PickleError";
 static const char __pyx_k_collections[] = "collections";
 static const char __pyx_k_match_start[] = "match_start";
 static const char __pyx_k_mro_entries[] = "__mro_entries__";
+static const char __pyx_k_E_DELIMITING[] = "E_DELIMITING";
 static const char __pyx_k_Finder_found[] = "Finder.found";
 static const char __pyx_k_Pyx_EnumBase[] = "__Pyx_EnumBase";
 static const char __pyx_k_Pyx_FlagBase[] = "__Pyx_FlagBase";
@@ -2912,8 +2913,8 @@ static const char __pyx_k_class_getitem[] = "__class_getitem__";
 static const char __pyx_k_data_received[] = "data_received";
 static const char __pyx_k_init_subclass[] = "__init_subclass__";
 static const char __pyx_k_reduce_cython[] = "__reduce_cython__";
+static const char __pyx_k_E_PART_HEADERS[] = "E_PART_HEADERS";
 static const char __pyx_k_Parser_on_body[] = "_Parser.on_body";
-static const char __pyx_k_UnexpectedPart[] = "UnexpectedPart";
 static const char __pyx_k_matched_length[] = "matched_length";
 static const char __pyx_k_AsyncPart_start[] = "AsyncPart.start";
 static const char __pyx_k_Finder_inactive[] = "Finder.inactive";
@@ -2925,6 +2926,7 @@ static const char __pyx_k_set_active_part[] = "set_active_part";
 static const char __pyx_k_setstate_cython[] = "__setstate_cython__";
 static const char __pyx_k_AsyncPart_finish[] = "AsyncPart.finish";
 static const char __pyx_k_get_content_type[] = "get_content_type";
+static const char __pyx_k_E_UNEXPECTED_PART[] = "E_UNEXPECTED_PART";
 static const char __pyx_k_pyx_unpickle_Part[] = "__pyx_unpickle_Part";
 static const char __pyx_k_unset_active_part[] = "unset_active_part";
 static const char __pyx_k_Part_data_received[] = "Part.data_received";
@@ -2974,6 +2976,7 @@ static const char __pyx_k_Pyx_EnumMeta___reduce_cython[] = "__Pyx_EnumMeta.__red
 static const char __pyx_k_Parser_async_unset_active_part[] = "_Parser.async_unset_active_part";
 static const char __pyx_k_Pyx_EnumMeta___setstate_cython[] = "__Pyx_EnumMeta.__setstate_cython__";
 static const char __pyx_k_AsyncPart_set_multipart_content[] = "AsyncPart.set_multipart_content_type";
+static const char __pyx_k_Error_codes_returned_by_the_par[] = "\n    Error codes returned by the parser\n    ";
 static const char __pyx_k_Part_set_multipart_content_type[] = "Part.set_multipart_content_type";
 static const char __pyx_k_streaming_form_data__parser_pyx[] = "streaming_form_data/_parser.pyx";
 static const char __pyx_k_AsyncPart_set_multipart_filename[] = "AsyncPart.set_multipart_filename";
@@ -3122,11 +3125,16 @@ typedef struct {
   PyObject *__pyx_n_s_AsyncPart_set_multipart_content;
   PyObject *__pyx_n_s_AsyncPart_set_multipart_filename;
   PyObject *__pyx_n_s_AsyncPart_start;
-  PyObject *__pyx_n_s_Delimiting;
+  PyObject *__pyx_n_s_E_DELIMITING;
+  PyObject *__pyx_n_s_E_INTERNAL;
+  PyObject *__pyx_n_s_E_OK;
+  PyObject *__pyx_n_s_E_PART_HEADERS;
+  PyObject *__pyx_n_s_E_UNEXPECTED_PART;
   PyObject *__pyx_kp_u_Empty_values_not_allowed;
   PyObject *__pyx_n_s_EnumBase;
   PyObject *__pyx_n_s_EnumType;
-  PyObject *__pyx_n_s_ErrorGroup;
+  PyObject *__pyx_n_s_ErrorCode;
+  PyObject *__pyx_kp_s_Error_codes_returned_by_the_par;
   PyObject *__pyx_n_s_Finder;
   PyObject *__pyx_n_s_Finder___reduce_cython;
   PyObject *__pyx_n_s_Finder___setstate_cython;
@@ -3141,7 +3149,6 @@ typedef struct {
   PyObject *__pyx_kp_s_Incompatible_checksums_0x_x_vs_0_4;
   PyObject *__pyx_n_s_IntEnum;
   PyObject *__pyx_n_s_IntFlag;
-  PyObject *__pyx_n_s_Internal;
   PyObject *__pyx_n_s_NullTarget;
   PyObject *__pyx_n_s_OrderedDict;
   PyObject *__pyx_n_s_Parser;
@@ -3159,7 +3166,6 @@ typedef struct {
   PyObject *__pyx_n_s_Parser_set_active_part;
   PyObject *__pyx_n_s_Parser_unset_active_part;
   PyObject *__pyx_n_s_Part;
-  PyObject *__pyx_n_s_PartHeaders;
   PyObject *__pyx_n_s_Part___reduce_cython;
   PyObject *__pyx_n_s_Part___setstate_cython;
   PyObject *__pyx_n_s_Part_add_target;
@@ -3179,7 +3185,6 @@ typedef struct {
   PyObject *__pyx_n_s_Pyx_FlagBase___new;
   PyObject *__pyx_n_s_Pyx_FlagBase___repr;
   PyObject *__pyx_n_s_Pyx_FlagBase___str;
-  PyObject *__pyx_n_s_UnexpectedPart;
   PyObject *__pyx_kp_s_Unknown_enum_value_s;
   PyObject *__pyx_n_s_ValueError;
   PyObject *__pyx_kp_b__12;
@@ -3315,7 +3320,6 @@ typedef struct {
   PyObject *__pyx_n_s_v;
   PyObject *__pyx_n_s_value;
   PyObject *__pyx_n_s_values;
-  PyObject *__pyx_int_0;
   PyObject *__pyx_int_8739453;
   PyObject *__pyx_int_12740226;
   PyObject *__pyx_int_12977755;
@@ -3472,11 +3476,16 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_AsyncPart_set_multipart_content);
   Py_CLEAR(clear_module_state->__pyx_n_s_AsyncPart_set_multipart_filename);
   Py_CLEAR(clear_module_state->__pyx_n_s_AsyncPart_start);
-  Py_CLEAR(clear_module_state->__pyx_n_s_Delimiting);
+  Py_CLEAR(clear_module_state->__pyx_n_s_E_DELIMITING);
+  Py_CLEAR(clear_module_state->__pyx_n_s_E_INTERNAL);
+  Py_CLEAR(clear_module_state->__pyx_n_s_E_OK);
+  Py_CLEAR(clear_module_state->__pyx_n_s_E_PART_HEADERS);
+  Py_CLEAR(clear_module_state->__pyx_n_s_E_UNEXPECTED_PART);
   Py_CLEAR(clear_module_state->__pyx_kp_u_Empty_values_not_allowed);
   Py_CLEAR(clear_module_state->__pyx_n_s_EnumBase);
   Py_CLEAR(clear_module_state->__pyx_n_s_EnumType);
-  Py_CLEAR(clear_module_state->__pyx_n_s_ErrorGroup);
+  Py_CLEAR(clear_module_state->__pyx_n_s_ErrorCode);
+  Py_CLEAR(clear_module_state->__pyx_kp_s_Error_codes_returned_by_the_par);
   Py_CLEAR(clear_module_state->__pyx_n_s_Finder);
   Py_CLEAR(clear_module_state->__pyx_n_s_Finder___reduce_cython);
   Py_CLEAR(clear_module_state->__pyx_n_s_Finder___setstate_cython);
@@ -3491,7 +3500,6 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_kp_s_Incompatible_checksums_0x_x_vs_0_4);
   Py_CLEAR(clear_module_state->__pyx_n_s_IntEnum);
   Py_CLEAR(clear_module_state->__pyx_n_s_IntFlag);
-  Py_CLEAR(clear_module_state->__pyx_n_s_Internal);
   Py_CLEAR(clear_module_state->__pyx_n_s_NullTarget);
   Py_CLEAR(clear_module_state->__pyx_n_s_OrderedDict);
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser);
@@ -3509,7 +3517,6 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser_set_active_part);
   Py_CLEAR(clear_module_state->__pyx_n_s_Parser_unset_active_part);
   Py_CLEAR(clear_module_state->__pyx_n_s_Part);
-  Py_CLEAR(clear_module_state->__pyx_n_s_PartHeaders);
   Py_CLEAR(clear_module_state->__pyx_n_s_Part___reduce_cython);
   Py_CLEAR(clear_module_state->__pyx_n_s_Part___setstate_cython);
   Py_CLEAR(clear_module_state->__pyx_n_s_Part_add_target);
@@ -3529,7 +3536,6 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_Pyx_FlagBase___new);
   Py_CLEAR(clear_module_state->__pyx_n_s_Pyx_FlagBase___repr);
   Py_CLEAR(clear_module_state->__pyx_n_s_Pyx_FlagBase___str);
-  Py_CLEAR(clear_module_state->__pyx_n_s_UnexpectedPart);
   Py_CLEAR(clear_module_state->__pyx_kp_s_Unknown_enum_value_s);
   Py_CLEAR(clear_module_state->__pyx_n_s_ValueError);
   Py_CLEAR(clear_module_state->__pyx_kp_b__12);
@@ -3665,7 +3671,6 @@ static int __pyx_m_clear(PyObject *m) {
   Py_CLEAR(clear_module_state->__pyx_n_s_v);
   Py_CLEAR(clear_module_state->__pyx_n_s_value);
   Py_CLEAR(clear_module_state->__pyx_n_s_values);
-  Py_CLEAR(clear_module_state->__pyx_int_0);
   Py_CLEAR(clear_module_state->__pyx_int_8739453);
   Py_CLEAR(clear_module_state->__pyx_int_12740226);
   Py_CLEAR(clear_module_state->__pyx_int_12977755);
@@ -3800,11 +3805,16 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_AsyncPart_set_multipart_content);
   Py_VISIT(traverse_module_state->__pyx_n_s_AsyncPart_set_multipart_filename);
   Py_VISIT(traverse_module_state->__pyx_n_s_AsyncPart_start);
-  Py_VISIT(traverse_module_state->__pyx_n_s_Delimiting);
+  Py_VISIT(traverse_module_state->__pyx_n_s_E_DELIMITING);
+  Py_VISIT(traverse_module_state->__pyx_n_s_E_INTERNAL);
+  Py_VISIT(traverse_module_state->__pyx_n_s_E_OK);
+  Py_VISIT(traverse_module_state->__pyx_n_s_E_PART_HEADERS);
+  Py_VISIT(traverse_module_state->__pyx_n_s_E_UNEXPECTED_PART);
   Py_VISIT(traverse_module_state->__pyx_kp_u_Empty_values_not_allowed);
   Py_VISIT(traverse_module_state->__pyx_n_s_EnumBase);
   Py_VISIT(traverse_module_state->__pyx_n_s_EnumType);
-  Py_VISIT(traverse_module_state->__pyx_n_s_ErrorGroup);
+  Py_VISIT(traverse_module_state->__pyx_n_s_ErrorCode);
+  Py_VISIT(traverse_module_state->__pyx_kp_s_Error_codes_returned_by_the_par);
   Py_VISIT(traverse_module_state->__pyx_n_s_Finder);
   Py_VISIT(traverse_module_state->__pyx_n_s_Finder___reduce_cython);
   Py_VISIT(traverse_module_state->__pyx_n_s_Finder___setstate_cython);
@@ -3819,7 +3829,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_kp_s_Incompatible_checksums_0x_x_vs_0_4);
   Py_VISIT(traverse_module_state->__pyx_n_s_IntEnum);
   Py_VISIT(traverse_module_state->__pyx_n_s_IntFlag);
-  Py_VISIT(traverse_module_state->__pyx_n_s_Internal);
   Py_VISIT(traverse_module_state->__pyx_n_s_NullTarget);
   Py_VISIT(traverse_module_state->__pyx_n_s_OrderedDict);
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser);
@@ -3837,7 +3846,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser_set_active_part);
   Py_VISIT(traverse_module_state->__pyx_n_s_Parser_unset_active_part);
   Py_VISIT(traverse_module_state->__pyx_n_s_Part);
-  Py_VISIT(traverse_module_state->__pyx_n_s_PartHeaders);
   Py_VISIT(traverse_module_state->__pyx_n_s_Part___reduce_cython);
   Py_VISIT(traverse_module_state->__pyx_n_s_Part___setstate_cython);
   Py_VISIT(traverse_module_state->__pyx_n_s_Part_add_target);
@@ -3857,7 +3865,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_Pyx_FlagBase___new);
   Py_VISIT(traverse_module_state->__pyx_n_s_Pyx_FlagBase___repr);
   Py_VISIT(traverse_module_state->__pyx_n_s_Pyx_FlagBase___str);
-  Py_VISIT(traverse_module_state->__pyx_n_s_UnexpectedPart);
   Py_VISIT(traverse_module_state->__pyx_kp_s_Unknown_enum_value_s);
   Py_VISIT(traverse_module_state->__pyx_n_s_ValueError);
   Py_VISIT(traverse_module_state->__pyx_kp_b__12);
@@ -3993,7 +4000,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
   Py_VISIT(traverse_module_state->__pyx_n_s_v);
   Py_VISIT(traverse_module_state->__pyx_n_s_value);
   Py_VISIT(traverse_module_state->__pyx_n_s_values);
-  Py_VISIT(traverse_module_state->__pyx_int_0);
   Py_VISIT(traverse_module_state->__pyx_int_8739453);
   Py_VISIT(traverse_module_state->__pyx_int_12740226);
   Py_VISIT(traverse_module_state->__pyx_int_12977755);
@@ -4138,11 +4144,16 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_AsyncPart_set_multipart_content __pyx_mstate_global->__pyx_n_s_AsyncPart_set_multipart_content
 #define __pyx_n_s_AsyncPart_set_multipart_filename __pyx_mstate_global->__pyx_n_s_AsyncPart_set_multipart_filename
 #define __pyx_n_s_AsyncPart_start __pyx_mstate_global->__pyx_n_s_AsyncPart_start
-#define __pyx_n_s_Delimiting __pyx_mstate_global->__pyx_n_s_Delimiting
+#define __pyx_n_s_E_DELIMITING __pyx_mstate_global->__pyx_n_s_E_DELIMITING
+#define __pyx_n_s_E_INTERNAL __pyx_mstate_global->__pyx_n_s_E_INTERNAL
+#define __pyx_n_s_E_OK __pyx_mstate_global->__pyx_n_s_E_OK
+#define __pyx_n_s_E_PART_HEADERS __pyx_mstate_global->__pyx_n_s_E_PART_HEADERS
+#define __pyx_n_s_E_UNEXPECTED_PART __pyx_mstate_global->__pyx_n_s_E_UNEXPECTED_PART
 #define __pyx_kp_u_Empty_values_not_allowed __pyx_mstate_global->__pyx_kp_u_Empty_values_not_allowed
 #define __pyx_n_s_EnumBase __pyx_mstate_global->__pyx_n_s_EnumBase
 #define __pyx_n_s_EnumType __pyx_mstate_global->__pyx_n_s_EnumType
-#define __pyx_n_s_ErrorGroup __pyx_mstate_global->__pyx_n_s_ErrorGroup
+#define __pyx_n_s_ErrorCode __pyx_mstate_global->__pyx_n_s_ErrorCode
+#define __pyx_kp_s_Error_codes_returned_by_the_par __pyx_mstate_global->__pyx_kp_s_Error_codes_returned_by_the_par
 #define __pyx_n_s_Finder __pyx_mstate_global->__pyx_n_s_Finder
 #define __pyx_n_s_Finder___reduce_cython __pyx_mstate_global->__pyx_n_s_Finder___reduce_cython
 #define __pyx_n_s_Finder___setstate_cython __pyx_mstate_global->__pyx_n_s_Finder___setstate_cython
@@ -4157,7 +4168,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_kp_s_Incompatible_checksums_0x_x_vs_0_4 __pyx_mstate_global->__pyx_kp_s_Incompatible_checksums_0x_x_vs_0_4
 #define __pyx_n_s_IntEnum __pyx_mstate_global->__pyx_n_s_IntEnum
 #define __pyx_n_s_IntFlag __pyx_mstate_global->__pyx_n_s_IntFlag
-#define __pyx_n_s_Internal __pyx_mstate_global->__pyx_n_s_Internal
 #define __pyx_n_s_NullTarget __pyx_mstate_global->__pyx_n_s_NullTarget
 #define __pyx_n_s_OrderedDict __pyx_mstate_global->__pyx_n_s_OrderedDict
 #define __pyx_n_s_Parser __pyx_mstate_global->__pyx_n_s_Parser
@@ -4175,7 +4185,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_Parser_set_active_part __pyx_mstate_global->__pyx_n_s_Parser_set_active_part
 #define __pyx_n_s_Parser_unset_active_part __pyx_mstate_global->__pyx_n_s_Parser_unset_active_part
 #define __pyx_n_s_Part __pyx_mstate_global->__pyx_n_s_Part
-#define __pyx_n_s_PartHeaders __pyx_mstate_global->__pyx_n_s_PartHeaders
 #define __pyx_n_s_Part___reduce_cython __pyx_mstate_global->__pyx_n_s_Part___reduce_cython
 #define __pyx_n_s_Part___setstate_cython __pyx_mstate_global->__pyx_n_s_Part___setstate_cython
 #define __pyx_n_s_Part_add_target __pyx_mstate_global->__pyx_n_s_Part_add_target
@@ -4195,7 +4204,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_Pyx_FlagBase___new __pyx_mstate_global->__pyx_n_s_Pyx_FlagBase___new
 #define __pyx_n_s_Pyx_FlagBase___repr __pyx_mstate_global->__pyx_n_s_Pyx_FlagBase___repr
 #define __pyx_n_s_Pyx_FlagBase___str __pyx_mstate_global->__pyx_n_s_Pyx_FlagBase___str
-#define __pyx_n_s_UnexpectedPart __pyx_mstate_global->__pyx_n_s_UnexpectedPart
 #define __pyx_kp_s_Unknown_enum_value_s __pyx_mstate_global->__pyx_kp_s_Unknown_enum_value_s
 #define __pyx_n_s_ValueError __pyx_mstate_global->__pyx_n_s_ValueError
 #define __pyx_kp_b__12 __pyx_mstate_global->__pyx_kp_b__12
@@ -4331,7 +4339,6 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 #define __pyx_n_s_v __pyx_mstate_global->__pyx_n_s_v
 #define __pyx_n_s_value __pyx_mstate_global->__pyx_n_s_value
 #define __pyx_n_s_values __pyx_mstate_global->__pyx_n_s_values
-#define __pyx_int_0 __pyx_mstate_global->__pyx_int_0
 #define __pyx_int_8739453 __pyx_mstate_global->__pyx_int_8739453
 #define __pyx_int_12740226 __pyx_mstate_global->__pyx_int_12740226
 #define __pyx_int_12977755 __pyx_mstate_global->__pyx_int_12977755
@@ -4415,13 +4422,13 @@ static int __pyx_m_traverse(PyObject *m, visitproc visit, void *arg) {
 
 /* "EnumTypeToPy":3
  * 
- * @cname("__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py")
- * cdef __Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py(ErrorGroup c_val):             # <<<<<<<<<<<<<<
+ * @cname("__Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py")
+ * cdef __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(ErrorCode c_val):             # <<<<<<<<<<<<<<
  *     cdef object __pyx_enum
- *     __pyx_enum = ErrorGroup
+ *     __pyx_enum = ErrorCode
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-static PyObject *__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup __pyx_v_c_val) {
+static PyObject *__Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode __pyx_v_c_val) {
   PyObject *__pyx_v___pyx_enum = 0;
   int __pyx_v_underlying_c_val;
   PyObject *__pyx_r = NULL;
@@ -4434,39 +4441,39 @@ static PyObject *__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderp
   int __pyx_lineno = 0;
   const char *__pyx_filename = NULL;
   int __pyx_clineno = 0;
-  __Pyx_RefNannySetupContext("__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py", 1);
+  __Pyx_RefNannySetupContext("__Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py", 1);
 
   /* "EnumTypeToPy":5
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+ * cdef __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(ErrorCode c_val):
  *     cdef object __pyx_enum
- *     __pyx_enum = ErrorGroup             # <<<<<<<<<<<<<<
+ *     __pyx_enum = ErrorCode             # <<<<<<<<<<<<<<
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  *     if 0:
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-  __Pyx_GetModuleGlobalName(__pyx_t_1, __pyx_n_s_ErrorGroup); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 5, __pyx_L1_error)
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   /* "EnumTypeToPy":7
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+ *     __pyx_enum = ErrorCode
  * 
  *     if 0:             # <<<<<<<<<<<<<<
  *         pass
- *     elif c_val == ErrorGroup.Internal:
+ *     elif c_val == ErrorCode.E_OK:
  */
   switch (__pyx_v_c_val) {
-    case __pyx_e_19streaming_form_data_7_parser_Internal:
+    case __pyx_e_19streaming_form_data_7_parser_E_OK:
 
     /* "EnumTypeToPy":10
  *         pass
- *     elif c_val == ErrorGroup.Internal:
- *         return __pyx_enum.Internal             # <<<<<<<<<<<<<<
- *     elif c_val == ErrorGroup.Delimiting:
- *         return __pyx_enum.Delimiting
+ *     elif c_val == ErrorCode.E_OK:
+ *         return __pyx_enum.E_OK             # <<<<<<<<<<<<<<
+ *     elif c_val == ErrorCode.E_INTERNAL:
+ *         return __pyx_enum.E_INTERNAL
  */
     __Pyx_XDECREF(__pyx_r);
-    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_Internal); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 10, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_E_OK); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 10, __pyx_L1_error)
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     __pyx_t_1 = 0;
@@ -4475,87 +4482,111 @@ static PyObject *__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderp
     /* "EnumTypeToPy":9
  *     if 0:
  *         pass
- *     elif c_val == ErrorGroup.Internal:             # <<<<<<<<<<<<<<
- *         return __pyx_enum.Internal
- *     elif c_val == ErrorGroup.Delimiting:
+ *     elif c_val == ErrorCode.E_OK:             # <<<<<<<<<<<<<<
+ *         return __pyx_enum.E_OK
+ *     elif c_val == ErrorCode.E_INTERNAL:
  */
     break;
-    case __pyx_e_19streaming_form_data_7_parser_Delimiting:
+    case __pyx_e_19streaming_form_data_7_parser_E_INTERNAL:
 
     /* "EnumTypeToPy":12
- *         return __pyx_enum.Internal
- *     elif c_val == ErrorGroup.Delimiting:
- *         return __pyx_enum.Delimiting             # <<<<<<<<<<<<<<
- *     elif c_val == ErrorGroup.PartHeaders:
- *         return __pyx_enum.PartHeaders
+ *         return __pyx_enum.E_OK
+ *     elif c_val == ErrorCode.E_INTERNAL:
+ *         return __pyx_enum.E_INTERNAL             # <<<<<<<<<<<<<<
+ *     elif c_val == ErrorCode.E_DELIMITING:
+ *         return __pyx_enum.E_DELIMITING
  */
     __Pyx_XDECREF(__pyx_r);
-    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_Delimiting); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 12, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_E_INTERNAL); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 12, __pyx_L1_error)
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     /* "EnumTypeToPy":11
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- *         return __pyx_enum.Internal
- *     elif c_val == ErrorGroup.Delimiting:             # <<<<<<<<<<<<<<
- *         return __pyx_enum.Delimiting
- *     elif c_val == ErrorGroup.PartHeaders:
+ *     elif c_val == ErrorCode.E_OK:
+ *         return __pyx_enum.E_OK
+ *     elif c_val == ErrorCode.E_INTERNAL:             # <<<<<<<<<<<<<<
+ *         return __pyx_enum.E_INTERNAL
+ *     elif c_val == ErrorCode.E_DELIMITING:
  */
     break;
-    case __pyx_e_19streaming_form_data_7_parser_PartHeaders:
+    case __pyx_e_19streaming_form_data_7_parser_E_DELIMITING:
 
     /* "EnumTypeToPy":14
- *         return __pyx_enum.Delimiting
- *     elif c_val == ErrorGroup.PartHeaders:
- *         return __pyx_enum.PartHeaders             # <<<<<<<<<<<<<<
- *     elif c_val == ErrorGroup.UnexpectedPart:
- *         return __pyx_enum.UnexpectedPart
+ *         return __pyx_enum.E_INTERNAL
+ *     elif c_val == ErrorCode.E_DELIMITING:
+ *         return __pyx_enum.E_DELIMITING             # <<<<<<<<<<<<<<
+ *     elif c_val == ErrorCode.E_PART_HEADERS:
+ *         return __pyx_enum.E_PART_HEADERS
  */
     __Pyx_XDECREF(__pyx_r);
-    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_PartHeaders); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 14, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_E_DELIMITING); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 14, __pyx_L1_error)
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     /* "EnumTypeToPy":13
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- *     elif c_val == ErrorGroup.PartHeaders:             # <<<<<<<<<<<<<<
- *         return __pyx_enum.PartHeaders
- *     elif c_val == ErrorGroup.UnexpectedPart:
+ *     elif c_val == ErrorCode.E_INTERNAL:
+ *         return __pyx_enum.E_INTERNAL
+ *     elif c_val == ErrorCode.E_DELIMITING:             # <<<<<<<<<<<<<<
+ *         return __pyx_enum.E_DELIMITING
+ *     elif c_val == ErrorCode.E_PART_HEADERS:
  */
     break;
-    case __pyx_e_19streaming_form_data_7_parser_UnexpectedPart:
+    case __pyx_e_19streaming_form_data_7_parser_E_PART_HEADERS:
 
     /* "EnumTypeToPy":16
- *         return __pyx_enum.PartHeaders
- *     elif c_val == ErrorGroup.UnexpectedPart:
- *         return __pyx_enum.UnexpectedPart             # <<<<<<<<<<<<<<
+ *         return __pyx_enum.E_DELIMITING
+ *     elif c_val == ErrorCode.E_PART_HEADERS:
+ *         return __pyx_enum.E_PART_HEADERS             # <<<<<<<<<<<<<<
+ *     elif c_val == ErrorCode.E_UNEXPECTED_PART:
+ *         return __pyx_enum.E_UNEXPECTED_PART
+ */
+    __Pyx_XDECREF(__pyx_r);
+    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_E_PART_HEADERS); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 16, __pyx_L1_error)
+    __Pyx_GOTREF(__pyx_t_1);
+    __pyx_r = __pyx_t_1;
+    __pyx_t_1 = 0;
+    goto __pyx_L0;
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+    /* "EnumTypeToPy":15
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+ *         return __pyx_enum.E_DELIMITING
+ *     elif c_val == ErrorCode.E_PART_HEADERS:             # <<<<<<<<<<<<<<
+ *         return __pyx_enum.E_PART_HEADERS
+ *     elif c_val == ErrorCode.E_UNEXPECTED_PART:
+ */
+    break;
+    case __pyx_e_19streaming_form_data_7_parser_E_UNEXPECTED_PART:
+
+    /* "EnumTypeToPy":18
+ *         return __pyx_enum.E_PART_HEADERS
+ *     elif c_val == ErrorCode.E_UNEXPECTED_PART:
+ *         return __pyx_enum.E_UNEXPECTED_PART             # <<<<<<<<<<<<<<
  *     else:
  *         underlying_c_val = <int>c_val
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     __Pyx_XDECREF(__pyx_r);
-    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_UnexpectedPart); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 16, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_GetAttrStr(__pyx_v___pyx_enum, __pyx_n_s_E_UNEXPECTED_PART); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 18, __pyx_L1_error)
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- *     elif c_val == ErrorGroup.UnexpectedPart:             # <<<<<<<<<<<<<<
- *         return __pyx_enum.UnexpectedPart
+    /* "EnumTypeToPy":17
+ *     elif c_val == ErrorCode.E_PART_HEADERS:
+ *         return __pyx_enum.E_PART_HEADERS
+ *     elif c_val == ErrorCode.E_UNEXPECTED_PART:             # <<<<<<<<<<<<<<
+ *         return __pyx_enum.E_UNEXPECTED_PART
  *     else:
  */
     break;
     default:
 
-    /* "EnumTypeToPy":18
- *         return __pyx_enum.UnexpectedPart
+    /* "EnumTypeToPy":20
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@@ -4563,14 +4594,14 @@ static PyObject *__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderp
  */
     __pyx_v_underlying_c_val = ((int)__pyx_v_c_val);
 
-    /* "EnumTypeToPy":19
+    /* "EnumTypeToPy":21
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+ * @cname("__Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py")
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-  __Pyx_AddTraceback("EnumTypeToPy.__Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py", __pyx_clineno, __pyx_lineno, __pyx_filename);
+  __Pyx_AddTraceback("EnumTypeToPy.__Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py", __pyx_clineno, __pyx_lineno, __pyx_filename);
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 }
 
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-  __Pyx_RaiseArgtupleInvalid("__init__", 1, 1, 1, __pyx_nargs); __PYX_ERR(0, 41, __pyx_L3_error)
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-    /* "streaming_form_data/_parser.pyx":43
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-    __PYX_ERR(0, 43, __pyx_L1_error)
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-    /* "streaming_form_data/_parser.pyx":42
+    /* "streaming_form_data/_parser.pyx":72
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  *     def __init__(self, target):
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@@ -7414,14 +7445,14 @@ static int __pyx_pf_19streaming_form_data_7_parser_6Finder___init__(struct __pyx
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-  /* "streaming_form_data/_parser.pyx":45
+  /* "streaming_form_data/_parser.pyx":75
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-  if (!(likely(PyBytes_CheckExact(__pyx_v_target))||((__pyx_v_target) == Py_None) || __Pyx_RaiseUnexpectedTypeError("bytes", __pyx_v_target))) __PYX_ERR(0, 45, __pyx_L1_error)
+  if (!(likely(PyBytes_CheckExact(__pyx_v_target))||((__pyx_v_target) == Py_None) || __Pyx_RaiseUnexpectedTypeError("bytes", __pyx_v_target))) __PYX_ERR(0, 75, __pyx_L1_error)
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-  /* "streaming_form_data/_parser.pyx":46
+  /* "streaming_form_data/_parser.pyx":76
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  *         self.target_ptr = self.target             # <<<<<<<<<<<<<<
@@ -7439,12 +7470,12 @@ static int __pyx_pf_19streaming_form_data_7_parser_6Finder___init__(struct __pyx
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-  /* "streaming_form_data/_parser.pyx":47
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  *         self.target_len = len(self.target)             # <<<<<<<<<<<<<<
@@ -7455,13 +7486,13 @@ static int __pyx_pf_19streaming_form_data_7_parser_6Finder___init__(struct __pyx
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-  /* "streaming_form_data/_parser.pyx":48
+  /* "streaming_form_data/_parser.pyx":78
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  *         self.target_len = len(self.target)
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@@ -7470,7 +7501,7 @@ static int __pyx_pf_19streaming_form_data_7_parser_6Finder___init__(struct __pyx
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   __pyx_v_self->index = 0;
 
-  /* "streaming_form_data/_parser.pyx":49
+  /* "streaming_form_data/_parser.pyx":79
  *         self.target_len = len(self.target)
  *         self.index = 0
  *         self.state = FinderState.FS_START             # <<<<<<<<<<<<<<
@@ -7479,7 +7510,7 @@ static int __pyx_pf_19streaming_form_data_7_parser_6Finder___init__(struct __pyx
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   __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_FS_START;
 
-  /* "streaming_form_data/_parser.pyx":41
+  /* "streaming_form_data/_parser.pyx":71
  *     cdef FinderState state
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  *     def __init__(self, target):             # <<<<<<<<<<<<<<
@@ -7499,7 +7530,7 @@ static int __pyx_pf_19streaming_form_data_7_parser_6Finder___init__(struct __pyx
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 }
 
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  * 
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@@ -7537,11 +7568,11 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-      __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_feed); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 51, __pyx_L1_error)
+      __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_feed); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 81, __pyx_L1_error)
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-        __pyx_t_3 = __Pyx_PyInt_From_unsigned_char(__pyx_v_byte); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 51, __pyx_L1_error)
+        __pyx_t_3 = __Pyx_PyInt_From_unsigned_char(__pyx_v_byte); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 81, __pyx_L1_error)
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@@ -7563,7 +7594,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-          if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 51, __pyx_L1_error)
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-  /* "streaming_form_data/_parser.pyx":52
+  /* "streaming_form_data/_parser.pyx":82
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  *     cpdef feed(self, Byte byte):
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@@ -7595,7 +7626,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-    /* "streaming_form_data/_parser.pyx":53
+    /* "streaming_form_data/_parser.pyx":83
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@@ -7605,7 +7636,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-      /* "streaming_form_data/_parser.pyx":54
+      /* "streaming_form_data/_parser.pyx":84
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@@ -7614,7 +7645,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-      /* "streaming_form_data/_parser.pyx":55
+      /* "streaming_form_data/_parser.pyx":85
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@@ -7623,7 +7654,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-      /* "streaming_form_data/_parser.pyx":61
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@@ -7633,7 +7664,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-        /* "streaming_form_data/_parser.pyx":62
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-        /* "streaming_form_data/_parser.pyx":63
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@@ -7651,7 +7682,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-        /* "streaming_form_data/_parser.pyx":61
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  *                 if byte == self.target_ptr[0]:             # <<<<<<<<<<<<<<
@@ -7660,7 +7691,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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       }
 
-      /* "streaming_form_data/_parser.pyx":53
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@@ -7669,7 +7700,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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-    /* "streaming_form_data/_parser.pyx":52
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  *     cpdef feed(self, Byte byte):
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@@ -7679,7 +7710,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
     goto __pyx_L3;
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-  /* "streaming_form_data/_parser.pyx":65
+  /* "streaming_form_data/_parser.pyx":95
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  *             self.state = FinderState.FS_WORKING             # <<<<<<<<<<<<<<
@@ -7689,7 +7720,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
   /*else*/ {
     __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_FS_WORKING;
 
-    /* "streaming_form_data/_parser.pyx":66
+    /* "streaming_form_data/_parser.pyx":96
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  *             self.index += 1             # <<<<<<<<<<<<<<
@@ -7698,7 +7729,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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     __pyx_v_self->index = (__pyx_v_self->index + 1);
 
-    /* "streaming_form_data/_parser.pyx":68
+    /* "streaming_form_data/_parser.pyx":98
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  *             if self.index == self.target_len:             # <<<<<<<<<<<<<<
@@ -7708,7 +7739,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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     if (__pyx_t_7) {
 
-      /* "streaming_form_data/_parser.pyx":69
+      /* "streaming_form_data/_parser.pyx":99
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  *             if self.index == self.target_len:
  *                 self.state = FinderState.FS_END             # <<<<<<<<<<<<<<
@@ -7717,7 +7748,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
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       __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_FS_END;
 
-      /* "streaming_form_data/_parser.pyx":68
+      /* "streaming_form_data/_parser.pyx":98
  *             self.index += 1
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  *             if self.index == self.target_len:             # <<<<<<<<<<<<<<
@@ -7728,7 +7759,7 @@ static PyObject *__pyx_f_19streaming_form_data_7_parser_6Finder_feed(struct __py
   }
   __pyx_L3:;
 
-  /* "streaming_form_data/_parser.pyx":51
+  /* "streaming_form_data/_parser.pyx":81
  *         self.state = FinderState.FS_START
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  *     cpdef feed(self, Byte byte):             # <<<<<<<<<<<<<<
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           (void)__Pyx_Arg_NewRef_FASTCALL(values[0]);
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-        else if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 51, __pyx_L3_error)
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+    __pyx_v_byte = __Pyx_PyInt_As_unsigned_char(values[0]); if (unlikely((__pyx_v_byte == (unsigned char)-1) && PyErr_Occurred())) __PYX_ERR(0, 81, __pyx_L3_error)
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@@ -7858,7 +7889,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_6Finder_2feed(struct __
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-  /* "streaming_form_data/_parser.pyx":239
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 }
 
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@@ -15983,7 +16019,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
     __pyx_t_3 = (__pyx_v_idx < __pyx_v_chunk_len);
     if (!__pyx_t_3) break;
 
-    /* "streaming_form_data/_parser.pyx":310
+    /* "streaming_form_data/_parser.pyx":320
  *         idx = index
  *         while idx < chunk_len:
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@@ -15992,7 +16028,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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     __pyx_v_byte = (__pyx_v_chunk_ptr[__pyx_v_idx]);
 
-    /* "streaming_form_data/_parser.pyx":312
+    /* "streaming_form_data/_parser.pyx":322
  *             byte = chunk_ptr[idx]
  * 
  *             if self.state == ParserState.PS_START:             # <<<<<<<<<<<<<<
@@ -16002,7 +16038,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
     switch (__pyx_v_self->state) {
       case __pyx_e_19streaming_form_data_7_parser_PS_START:
 
-      /* "streaming_form_data/_parser.pyx":313
+      /* "streaming_form_data/_parser.pyx":323
  * 
  *             if self.state == ParserState.PS_START:
  *                 if byte == c_hyphen:             # <<<<<<<<<<<<<<
@@ -16012,7 +16048,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       __pyx_t_3 = (__pyx_v_byte == __pyx_v_19streaming_form_data_7_parser_c_hyphen);
       if (__pyx_t_3) {
 
-        /* "streaming_form_data/_parser.pyx":314
+        /* "streaming_form_data/_parser.pyx":324
  *             if self.state == ParserState.PS_START:
  *                 if byte == c_hyphen:
  *                     buffer_start = idx             # <<<<<<<<<<<<<<
@@ -16021,7 +16057,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         __pyx_v_buffer_start = __pyx_v_idx;
 
-        /* "streaming_form_data/_parser.pyx":315
+        /* "streaming_form_data/_parser.pyx":325
  *                 if byte == c_hyphen:
  *                     buffer_start = idx
  *                     self.state = ParserState.PS_STARTING_BOUNDARY             # <<<<<<<<<<<<<<
@@ -16030,7 +16066,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_STARTING_BOUNDARY;
 
-        /* "streaming_form_data/_parser.pyx":313
+        /* "streaming_form_data/_parser.pyx":323
  * 
  *             if self.state == ParserState.PS_START:
  *                 if byte == c_hyphen:             # <<<<<<<<<<<<<<
@@ -16040,7 +16076,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
         goto __pyx_L5;
       }
 
-      /* "streaming_form_data/_parser.pyx":316
+      /* "streaming_form_data/_parser.pyx":326
  *                     buffer_start = idx
  *                     self.state = ParserState.PS_STARTING_BOUNDARY
  *                 elif byte == c_cr:             # <<<<<<<<<<<<<<
@@ -16050,7 +16086,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       __pyx_t_3 = (__pyx_v_byte == __pyx_v_19streaming_form_data_7_parser_c_cr);
       if (__pyx_t_3) {
 
-        /* "streaming_form_data/_parser.pyx":317
+        /* "streaming_form_data/_parser.pyx":327
  *                     self.state = ParserState.PS_STARTING_BOUNDARY
  *                 elif byte == c_cr:
  *                     self.state = ParserState.PS_START_CR             # <<<<<<<<<<<<<<
@@ -16059,7 +16095,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_START_CR;
 
-        /* "streaming_form_data/_parser.pyx":316
+        /* "streaming_form_data/_parser.pyx":326
  *                     buffer_start = idx
  *                     self.state = ParserState.PS_STARTING_BOUNDARY
  *                 elif byte == c_cr:             # <<<<<<<<<<<<<<
@@ -16069,27 +16105,27 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
         goto __pyx_L5;
       }
 
-      /* "streaming_form_data/_parser.pyx":319
+      /* "streaming_form_data/_parser.pyx":329
  *                     self.state = ParserState.PS_START_CR
  *                 else:
  *                     self.mark_error()             # <<<<<<<<<<<<<<
- *                     return ErrorGroup.Delimiting + 1
+ *                     return ErrorCode.E_DELIMITING
  * 
  */
       /*else*/ {
-        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 319, __pyx_L1_error)
+        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 329, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_4);
         __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-        /* "streaming_form_data/_parser.pyx":320
+        /* "streaming_form_data/_parser.pyx":330
  *                 else:
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 1             # <<<<<<<<<<<<<<
+ *                     return ErrorCode.E_DELIMITING             # <<<<<<<<<<<<<<
  * 
  *             elif self.state == ParserState.PS_START_CR:
  */
         __Pyx_XDECREF(__pyx_r);
-        __pyx_t_4 = __Pyx_PyInt_From_long((__pyx_e_19streaming_form_data_7_parser_Delimiting + 1)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 320, __pyx_L1_error)
+        __pyx_t_4 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_DELIMITING); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 330, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_4);
         __pyx_r = __pyx_t_4;
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@@ -16097,7 +16133,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       }
       __pyx_L5:;
 
-      /* "streaming_form_data/_parser.pyx":312
+      /* "streaming_form_data/_parser.pyx":322
  *             byte = chunk_ptr[idx]
  * 
  *             if self.state == ParserState.PS_START:             # <<<<<<<<<<<<<<
@@ -16107,7 +16143,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
       case __pyx_e_19streaming_form_data_7_parser_PS_START_CR:
 
-      /* "streaming_form_data/_parser.pyx":323
+      /* "streaming_form_data/_parser.pyx":333
  * 
  *             elif self.state == ParserState.PS_START_CR:
  *                 if byte == c_lf:             # <<<<<<<<<<<<<<
@@ -16117,7 +16153,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       __pyx_t_3 = (__pyx_v_byte == __pyx_v_19streaming_form_data_7_parser_c_lf);
       if (__pyx_t_3) {
 
-        /* "streaming_form_data/_parser.pyx":324
+        /* "streaming_form_data/_parser.pyx":334
  *             elif self.state == ParserState.PS_START_CR:
  *                 if byte == c_lf:
  *                     self.state = ParserState.PS_START             # <<<<<<<<<<<<<<
@@ -16126,7 +16162,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_START;
 
-        /* "streaming_form_data/_parser.pyx":323
+        /* "streaming_form_data/_parser.pyx":333
  * 
  *             elif self.state == ParserState.PS_START_CR:
  *                 if byte == c_lf:             # <<<<<<<<<<<<<<
@@ -16136,27 +16172,27 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
         goto __pyx_L6;
       }
 
-      /* "streaming_form_data/_parser.pyx":326
+      /* "streaming_form_data/_parser.pyx":336
  *                     self.state = ParserState.PS_START
  *                 else:
  *                     self.mark_error()             # <<<<<<<<<<<<<<
- *                     return ErrorGroup.Delimiting + 4
+ *                     return ErrorCode.E_DELIMITING
  * 
  */
       /*else*/ {
-        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 326, __pyx_L1_error)
+        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 336, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_4);
         __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-        /* "streaming_form_data/_parser.pyx":327
+        /* "streaming_form_data/_parser.pyx":337
  *                 else:
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 4             # <<<<<<<<<<<<<<
+ *                     return ErrorCode.E_DELIMITING             # <<<<<<<<<<<<<<
  * 
  *             elif self.state == ParserState.PS_STARTING_BOUNDARY:
  */
         __Pyx_XDECREF(__pyx_r);
-        __pyx_t_4 = __Pyx_PyInt_From_long((__pyx_e_19streaming_form_data_7_parser_Delimiting + 4)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 327, __pyx_L1_error)
+        __pyx_t_4 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_DELIMITING); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 337, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_4);
         __pyx_r = __pyx_t_4;
         __pyx_t_4 = 0;
@@ -16164,8 +16200,8 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       }
       __pyx_L6:;
 
-      /* "streaming_form_data/_parser.pyx":322
- *                     return ErrorGroup.Delimiting + 1
+      /* "streaming_form_data/_parser.pyx":332
+ *                     return ErrorCode.E_DELIMITING
  * 
  *             elif self.state == ParserState.PS_START_CR:             # <<<<<<<<<<<<<<
  *                 if byte == c_lf:
@@ -16174,52 +16210,52 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
       case __pyx_e_19streaming_form_data_7_parser_PS_STARTING_BOUNDARY:
 
-      /* "streaming_form_data/_parser.pyx":330
+      /* "streaming_form_data/_parser.pyx":340
  * 
  *             elif self.state == ParserState.PS_STARTING_BOUNDARY:
  *                 if byte != c_hyphen:             # <<<<<<<<<<<<<<
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 2
+ *                     return ErrorCode.E_DELIMITING
  */
       __pyx_t_3 = (__pyx_v_byte != __pyx_v_19streaming_form_data_7_parser_c_hyphen);
       if (__pyx_t_3) {
 
-        /* "streaming_form_data/_parser.pyx":331
+        /* "streaming_form_data/_parser.pyx":341
  *             elif self.state == ParserState.PS_STARTING_BOUNDARY:
  *                 if byte != c_hyphen:
  *                     self.mark_error()             # <<<<<<<<<<<<<<
- *                     return ErrorGroup.Delimiting + 2
+ *                     return ErrorCode.E_DELIMITING
  * 
  */
-        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 331, __pyx_L1_error)
+        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 341, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_4);
         __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-        /* "streaming_form_data/_parser.pyx":332
+        /* "streaming_form_data/_parser.pyx":342
  *                 if byte != c_hyphen:
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 2             # <<<<<<<<<<<<<<
+ *                     return ErrorCode.E_DELIMITING             # <<<<<<<<<<<<<<
  * 
  *                 self.state = ParserState.PS_READING_BOUNDARY
  */
         __Pyx_XDECREF(__pyx_r);
-        __pyx_t_4 = __Pyx_PyInt_From_long((__pyx_e_19streaming_form_data_7_parser_Delimiting + 2)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 332, __pyx_L1_error)
+        __pyx_t_4 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_DELIMITING); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 342, __pyx_L1_error)
         __Pyx_GOTREF(__pyx_t_4);
         __pyx_r = __pyx_t_4;
         __pyx_t_4 = 0;
         goto __pyx_L0;
 
-        /* "streaming_form_data/_parser.pyx":330
+        /* "streaming_form_data/_parser.pyx":340
  * 
  *             elif self.state == ParserState.PS_STARTING_BOUNDARY:
  *                 if byte != c_hyphen:             # <<<<<<<<<<<<<<
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 2
+ *                     return ErrorCode.E_DELIMITING
  */
       }
 
-      /* "streaming_form_data/_parser.pyx":334
- *                     return ErrorGroup.Delimiting + 2
+      /* "streaming_form_data/_parser.pyx":344
+ *                     return ErrorCode.E_DELIMITING
  * 
  *                 self.state = ParserState.PS_READING_BOUNDARY             # <<<<<<<<<<<<<<
  *             elif self.state == ParserState.PS_READING_BOUNDARY:
@@ -16227,8 +16263,8 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
       __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_READING_BOUNDARY;
 
-      /* "streaming_form_data/_parser.pyx":329
- *                     return ErrorGroup.Delimiting + 4
+      /* "streaming_form_data/_parser.pyx":339
+ *                     return ErrorCode.E_DELIMITING
  * 
  *             elif self.state == ParserState.PS_STARTING_BOUNDARY:             # <<<<<<<<<<<<<<
  *                 if byte != c_hyphen:
@@ -16237,7 +16273,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
       case __pyx_e_19streaming_form_data_7_parser_PS_READING_BOUNDARY:
 
-      /* "streaming_form_data/_parser.pyx":336
+      /* "streaming_form_data/_parser.pyx":346
  *                 self.state = ParserState.PS_READING_BOUNDARY
  *             elif self.state == ParserState.PS_READING_BOUNDARY:
  *                 if byte == c_cr:             # <<<<<<<<<<<<<<
@@ -16247,7 +16283,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       __pyx_t_3 = (__pyx_v_byte == __pyx_v_19streaming_form_data_7_parser_c_cr);
       if (__pyx_t_3) {
 
-        /* "streaming_form_data/_parser.pyx":337
+        /* "streaming_form_data/_parser.pyx":347
  *             elif self.state == ParserState.PS_READING_BOUNDARY:
  *                 if byte == c_cr:
  *                     self.state = ParserState.PS_ENDING_BOUNDARY             # <<<<<<<<<<<<<<
@@ -16256,7 +16292,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_ENDING_BOUNDARY;
 
-        /* "streaming_form_data/_parser.pyx":336
+        /* "streaming_form_data/_parser.pyx":346
  *                 self.state = ParserState.PS_READING_BOUNDARY
  *             elif self.state == ParserState.PS_READING_BOUNDARY:
  *                 if byte == c_cr:             # <<<<<<<<<<<<<<
@@ -16265,7 +16301,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
       }
 
-      /* "streaming_form_data/_parser.pyx":335
+      /* "streaming_form_data/_parser.pyx":345
  * 
  *                 self.state = ParserState.PS_READING_BOUNDARY
  *             elif self.state == ParserState.PS_READING_BOUNDARY:             # <<<<<<<<<<<<<<
@@ -16275,106 +16311,106 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
       case __pyx_e_19streaming_form_data_7_parser_PS_ENDING_BOUNDARY:
 
-      /* "streaming_form_data/_parser.pyx":340
+      /* "streaming_form_data/_parser.pyx":350
  * 
  *             elif self.state == ParserState.PS_ENDING_BOUNDARY:
  *                 if byte != c_lf:             # <<<<<<<<<<<<<<
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 3
+ *                     return ErrorCode.E_DELIMITING
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       __pyx_t_3 = (__pyx_v_byte != __pyx_v_19streaming_form_data_7_parser_c_lf);
       if (__pyx_t_3) {
 
-        /* "streaming_form_data/_parser.pyx":341
+        /* "streaming_form_data/_parser.pyx":351
  *             elif self.state == ParserState.PS_ENDING_BOUNDARY:
  *                 if byte != c_lf:
  *                     self.mark_error()             # <<<<<<<<<<<<<<
- *                     return ErrorGroup.Delimiting + 3
+ *                     return ErrorCode.E_DELIMITING
  * 
  */
-        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 341, __pyx_L1_error)
+        __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 351, __pyx_L1_error)
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         __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
 
-        /* "streaming_form_data/_parser.pyx":342
+        /* "streaming_form_data/_parser.pyx":352
  *                 if byte != c_lf:
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 3             # <<<<<<<<<<<<<<
+ *                     return ErrorCode.E_DELIMITING             # <<<<<<<<<<<<<<
  * 
  *                 # ensure we have read correct starting delimiter
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         __Pyx_XDECREF(__pyx_r);
-        __pyx_t_4 = __Pyx_PyInt_From_long((__pyx_e_19streaming_form_data_7_parser_Delimiting + 3)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 342, __pyx_L1_error)
+        __pyx_t_4 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_DELIMITING); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 352, __pyx_L1_error)
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         __pyx_t_4 = 0;
         goto __pyx_L0;
 
-        /* "streaming_form_data/_parser.pyx":340
+        /* "streaming_form_data/_parser.pyx":350
  * 
  *             elif self.state == ParserState.PS_ENDING_BOUNDARY:
  *                 if byte != c_lf:             # <<<<<<<<<<<<<<
  *                     self.mark_error()
- *                     return ErrorGroup.Delimiting + 3
+ *                     return ErrorCode.E_DELIMITING
  */
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-      /* "streaming_form_data/_parser.pyx":345
+      /* "streaming_form_data/_parser.pyx":355
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  *                 # ensure we have read correct starting delimiter
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  *                     self.mark_error()
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+ *                     return ErrorCode.E_DELIMITING
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@@ -16667,37 +16703,37 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-        /* "streaming_form_data/_parser.pyx":373
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-        __pyx_t_9 = __Pyx_PyObject_IsTrue(__pyx_v_name); if (unlikely((__pyx_t_9 < 0))) __PYX_ERR(0, 373, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":374
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+          __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->_part_for(__pyx_v_self, ((PyObject*)__pyx_v_name)); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 384, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":375
+          /* "streaming_form_data/_parser.pyx":385
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@@ -16707,7 +16743,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-            /* "streaming_form_data/_parser.pyx":376
+            /* "streaming_form_data/_parser.pyx":386
  *                         part = self._part_for(name)
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@@ -16719,7 +16755,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-            /* "streaming_form_data/_parser.pyx":377
+            /* "streaming_form_data/_parser.pyx":387
  *                         if part is None:
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@@ -16728,14 +16764,14 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
             if (__pyx_v_self->strict) {
 
-              /* "streaming_form_data/_parser.pyx":378
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  *                             part = self.default_part
  *                             if self.strict:
  *                                 self.unexpected_part_name = name             # <<<<<<<<<<<<<<
  *                                 self.mark_error()
- *                                 return ErrorGroup.UnexpectedPart
+ *                                 return ErrorCode.E_UNEXPECTED_PART
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@@ -16744,32 +16780,32 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
               __pyx_v_self->unexpected_part_name = ((PyObject*)__pyx_t_6);
               __pyx_t_6 = 0;
 
-              /* "streaming_form_data/_parser.pyx":379
+              /* "streaming_form_data/_parser.pyx":389
  *                             if self.strict:
  *                                 self.unexpected_part_name = name
  *                                 self.mark_error()             # <<<<<<<<<<<<<<
- *                                 return ErrorGroup.UnexpectedPart
+ *                                 return ErrorCode.E_UNEXPECTED_PART
  * 
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-              __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 379, __pyx_L1_error)
+              __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 389, __pyx_L1_error)
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-              /* "streaming_form_data/_parser.pyx":380
+              /* "streaming_form_data/_parser.pyx":390
  *                                 self.unexpected_part_name = name
  *                                 self.mark_error()
- *                                 return ErrorGroup.UnexpectedPart             # <<<<<<<<<<<<<<
+ *                                 return ErrorCode.E_UNEXPECTED_PART             # <<<<<<<<<<<<<<
  * 
  *                         self.set_active_part(part, params.get("filename"))
  */
               __Pyx_XDECREF(__pyx_r);
-              __pyx_t_6 = __Pyx_Enum_54f4e2__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorGroup__etc_to_py(__pyx_e_19streaming_form_data_7_parser_UnexpectedPart); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 380, __pyx_L1_error)
+              __pyx_t_6 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_UNEXPECTED_PART); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 390, __pyx_L1_error)
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-              /* "streaming_form_data/_parser.pyx":377
+              /* "streaming_form_data/_parser.pyx":387
  *                         if part is None:
  *                             part = self.default_part
  *                             if self.strict:             # <<<<<<<<<<<<<<
@@ -16778,7 +16814,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
             }
 
-            /* "streaming_form_data/_parser.pyx":375
+            /* "streaming_form_data/_parser.pyx":385
  *                     if name:
  *                         part = self._part_for(name)
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@@ -16787,16 +16823,16 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
           }
 
-          /* "streaming_form_data/_parser.pyx":382
- *                                 return ErrorGroup.UnexpectedPart
+          /* "streaming_form_data/_parser.pyx":392
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  * 
  *                         self.set_active_part(part, params.get("filename"))             # <<<<<<<<<<<<<<
  *                 elif "content-type" in message:
  *                     if self.active_part:
  */
-          __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_set_active_part); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 382, __pyx_L1_error)
+          __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_set_active_part); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 392, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_5);
-          __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_v_params, __pyx_n_s_get); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 382, __pyx_L1_error)
+          __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_v_params, __pyx_n_s_get); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 392, __pyx_L1_error)
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           __pyx_t_10 = NULL;
           __pyx_t_8 = 0;
@@ -16816,7 +16852,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
             PyObject *__pyx_callargs[2] = {__pyx_t_10, __pyx_n_u_filename};
             __pyx_t_7 = __Pyx_PyObject_FastCall(__pyx_t_4, __pyx_callargs+1-__pyx_t_8, 1+__pyx_t_8);
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-            if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 382, __pyx_L1_error)
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@@ -16839,13 +16875,13 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
             __pyx_t_6 = __Pyx_PyObject_FastCall(__pyx_t_5, __pyx_callargs+1-__pyx_t_8, 2+__pyx_t_8);
             __Pyx_XDECREF(__pyx_t_4); __pyx_t_4 = 0;
             __Pyx_DECREF(__pyx_t_7); __pyx_t_7 = 0;
-            if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 382, __pyx_L1_error)
+            if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 392, __pyx_L1_error)
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           }
           __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
 
-          /* "streaming_form_data/_parser.pyx":373
+          /* "streaming_form_data/_parser.pyx":383
  *                     name = params.get("name")
  * 
  *                     if name:             # <<<<<<<<<<<<<<
@@ -16854,7 +16890,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         }
 
-        /* "streaming_form_data/_parser.pyx":365
+        /* "streaming_form_data/_parser.pyx":375
  *                 )
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  *                 if "content-disposition" in message:             # <<<<<<<<<<<<<<
@@ -16864,44 +16900,44 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
         goto __pyx_L13;
       }
 
-      /* "streaming_form_data/_parser.pyx":383
+      /* "streaming_form_data/_parser.pyx":393
  * 
  *                         self.set_active_part(part, params.get("filename"))
  *                 elif "content-type" in message:             # <<<<<<<<<<<<<<
  *                     if self.active_part:
  *                         self.active_part.set_multipart_content_type(
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-      __pyx_t_9 = (__Pyx_PySequence_ContainsTF(__pyx_kp_u_content_type, __pyx_v_message, Py_EQ)); if (unlikely((__pyx_t_9 < 0))) __PYX_ERR(0, 383, __pyx_L1_error)
+      __pyx_t_9 = (__Pyx_PySequence_ContainsTF(__pyx_kp_u_content_type, __pyx_v_message, Py_EQ)); if (unlikely((__pyx_t_9 < 0))) __PYX_ERR(0, 393, __pyx_L1_error)
       if (__pyx_t_9) {
 
-        /* "streaming_form_data/_parser.pyx":384
+        /* "streaming_form_data/_parser.pyx":394
  *                         self.set_active_part(part, params.get("filename"))
  *                 elif "content-type" in message:
  *                     if self.active_part:             # <<<<<<<<<<<<<<
  *                         self.active_part.set_multipart_content_type(
  *                             message.get_content_type()
  */
-        __pyx_t_9 = __Pyx_PyObject_IsTrue(__pyx_v_self->active_part); if (unlikely((__pyx_t_9 < 0))) __PYX_ERR(0, 384, __pyx_L1_error)
+        __pyx_t_9 = __Pyx_PyObject_IsTrue(__pyx_v_self->active_part); if (unlikely((__pyx_t_9 < 0))) __PYX_ERR(0, 394, __pyx_L1_error)
         if (__pyx_t_9) {
 
-          /* "streaming_form_data/_parser.pyx":385
+          /* "streaming_form_data/_parser.pyx":395
  *                 elif "content-type" in message:
  *                     if self.active_part:
  *                         self.active_part.set_multipart_content_type(             # <<<<<<<<<<<<<<
  *                             message.get_content_type()
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  */
-          __pyx_t_5 = __Pyx_PyObject_GetAttrStr(__pyx_v_self->active_part, __pyx_n_s_set_multipart_content_type); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 385, __pyx_L1_error)
+          __pyx_t_5 = __Pyx_PyObject_GetAttrStr(__pyx_v_self->active_part, __pyx_n_s_set_multipart_content_type); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 395, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_5);
 
-          /* "streaming_form_data/_parser.pyx":386
+          /* "streaming_form_data/_parser.pyx":396
  *                     if self.active_part:
  *                         self.active_part.set_multipart_content_type(
  *                             message.get_content_type()             # <<<<<<<<<<<<<<
  *                         )
  * 
  */
-          __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_v_message, __pyx_n_s_get_content_type); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 386, __pyx_L1_error)
+          __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_v_message, __pyx_n_s_get_content_type); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 396, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_4);
           __pyx_t_10 = NULL;
           __pyx_t_8 = 0;
@@ -16921,7 +16957,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
             PyObject *__pyx_callargs[2] = {__pyx_t_10, NULL};
             __pyx_t_7 = __Pyx_PyObject_FastCall(__pyx_t_4, __pyx_callargs+1-__pyx_t_8, 0+__pyx_t_8);
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-            if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 386, __pyx_L1_error)
+            if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 396, __pyx_L1_error)
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@@ -16944,13 +16980,13 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
             __pyx_t_6 = __Pyx_PyObject_FastCall(__pyx_t_5, __pyx_callargs+1-__pyx_t_8, 1+__pyx_t_8);
             __Pyx_XDECREF(__pyx_t_4); __pyx_t_4 = 0;
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-            if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 385, __pyx_L1_error)
+            if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 395, __pyx_L1_error)
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           }
           __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
 
-          /* "streaming_form_data/_parser.pyx":384
+          /* "streaming_form_data/_parser.pyx":394
  *                         self.set_active_part(part, params.get("filename"))
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  *                     if self.active_part:             # <<<<<<<<<<<<<<
@@ -16959,7 +16995,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
         }
 
-        /* "streaming_form_data/_parser.pyx":383
+        /* "streaming_form_data/_parser.pyx":393
  * 
  *                         self.set_active_part(part, params.get("filename"))
  *                 elif "content-type" in message:             # <<<<<<<<<<<<<<
@@ -16969,7 +17005,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       }
       __pyx_L13:;
 
-      /* "streaming_form_data/_parser.pyx":389
+      /* "streaming_form_data/_parser.pyx":399
  *                         )
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@@ -16978,7 +17014,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
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-      /* "streaming_form_data/_parser.pyx":391
+      /* "streaming_form_data/_parser.pyx":401
  *                 buffer_start = idx + 1
  * 
  *                 self.state = ParserState.PS_ENDED_HEADER             # <<<<<<<<<<<<<<
@@ -16987,7 +17023,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
       __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_ENDED_HEADER;
 
-      /* "streaming_form_data/_parser.pyx":356
+      /* "streaming_form_data/_parser.pyx":366
  *                     self.state = ParserState.PS_ENDING_HEADER
  * 
  *             elif self.state == ParserState.PS_ENDING_HEADER:             # <<<<<<<<<<<<<<
@@ -16997,7 +17033,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
       case __pyx_e_19streaming_form_data_7_parser_PS_ENDED_HEADER:
 
-      /* "streaming_form_data/_parser.pyx":393
+      /* "streaming_form_data/_parser.pyx":403
  *                 self.state = ParserState.PS_ENDED_HEADER
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  *                 if byte == c_cr:             # <<<<<<<<<<<<<<
@@ -17007,7 +17043,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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       if (__pyx_t_9) {
 
-        /* "streaming_form_data/_parser.pyx":394
+        /* "streaming_form_data/_parser.pyx":404
  *             elif self.state == ParserState.PS_ENDED_HEADER:
  *                 if byte == c_cr:
  *                     self.state = ParserState.PS_ENDING_ALL_HEADERS             # <<<<<<<<<<<<<<
@@ -17016,7 +17052,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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         __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_ENDING_ALL_HEADERS;
 
-        /* "streaming_form_data/_parser.pyx":393
+        /* "streaming_form_data/_parser.pyx":403
  *                 self.state = ParserState.PS_ENDED_HEADER
  *             elif self.state == ParserState.PS_ENDED_HEADER:
  *                 if byte == c_cr:             # <<<<<<<<<<<<<<
@@ -17026,7 +17062,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
         goto __pyx_L19;
       }
 
-      /* "streaming_form_data/_parser.pyx":396
+      /* "streaming_form_data/_parser.pyx":406
  *                     self.state = ParserState.PS_ENDING_ALL_HEADERS
  *                 else:
  *                     self.state = ParserState.PS_READING_HEADER             # <<<<<<<<<<<<<<
@@ -17038,7 +17074,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       }
       __pyx_L19:;
 
-      /* "streaming_form_data/_parser.pyx":392
+      /* "streaming_form_data/_parser.pyx":402
  * 
  *                 self.state = ParserState.PS_ENDED_HEADER
  *             elif self.state == ParserState.PS_ENDED_HEADER:             # <<<<<<<<<<<<<<
@@ -17048,52 +17084,52 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
       case __pyx_e_19streaming_form_data_7_parser_PS_ENDING_ALL_HEADERS:
 
-      /* "streaming_form_data/_parser.pyx":399
+      /* "streaming_form_data/_parser.pyx":409
  * 
  *             elif self.state == ParserState.PS_ENDING_ALL_HEADERS:
  *                 if byte != c_lf:             # <<<<<<<<<<<<<<
  *                     self.mark_error()
- *                     return ErrorGroup.PartHeaders + 2
+ *                     return ErrorCode.E_PART_HEADERS
  */
       __pyx_t_9 = (__pyx_v_byte != __pyx_v_19streaming_form_data_7_parser_c_lf);
       if (__pyx_t_9) {
 
-        /* "streaming_form_data/_parser.pyx":400
+        /* "streaming_form_data/_parser.pyx":410
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  *                 if byte != c_lf:
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-        /* "streaming_form_data/_parser.pyx":399
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-      /* "streaming_form_data/_parser.pyx":403
- *                     return ErrorGroup.PartHeaders + 2
+      /* "streaming_form_data/_parser.pyx":413
+ *                     return ErrorCode.E_PART_HEADERS
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@@ -17101,7 +17137,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-      /* "streaming_form_data/_parser.pyx":405
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@@ -17110,7 +17146,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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       __pyx_v_self->state = __pyx_e_19streaming_form_data_7_parser_PS_READING_BODY;
 
-      /* "streaming_form_data/_parser.pyx":398
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@@ -17120,39 +17156,39 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-      /* "streaming_form_data/_parser.pyx":407
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-      /* "streaming_form_data/_parser.pyx":410
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-        /* "streaming_form_data/_parser.pyx":411
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-        /* "streaming_form_data/_parser.pyx":413
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-          /* "streaming_form_data/_parser.pyx":413
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-        /* "streaming_form_data/_parser.pyx":417
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+        /* "streaming_form_data/_parser.pyx":427
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-        /* "streaming_form_data/_parser.pyx":419
+        /* "streaming_form_data/_parser.pyx":429
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-          /* "streaming_form_data/_parser.pyx":420
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  *                     if match_start >= buffer_start:
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@@ -17240,20 +17276,20 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-              /* "streaming_form_data/_parser.pyx":421
+              /* "streaming_form_data/_parser.pyx":431
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  *                             self.on_body(chunk[buffer_start: match_start])             # <<<<<<<<<<<<<<
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  *                             self.mark_error()
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-              __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_on_body); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 421, __pyx_L24_error)
+              __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_on_body); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 431, __pyx_L24_error)
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@@ -17274,13 +17310,13 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-                if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 421, __pyx_L24_error)
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-              /* "streaming_form_data/_parser.pyx":420
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@@ -17299,7 +17335,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-            /* "streaming_form_data/_parser.pyx":422
+            /* "streaming_form_data/_parser.pyx":432
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@@ -17309,23 +17345,23 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-              if (__Pyx_GetException(&__pyx_t_6, &__pyx_t_5, &__pyx_t_7) < 0) __PYX_ERR(0, 422, __pyx_L26_except_error)
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-              /* "streaming_form_data/_parser.pyx":423
+              /* "streaming_form_data/_parser.pyx":433
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-              __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 423, __pyx_L26_except_error)
+              __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 433, __pyx_L26_except_error)
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-              /* "streaming_form_data/_parser.pyx":424
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@@ -17337,11 +17373,11 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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+            /* "streaming_form_data/_parser.pyx":430
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@@ -17357,7 +17393,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-          /* "streaming_form_data/_parser.pyx":426
+          /* "streaming_form_data/_parser.pyx":436
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  *                         buffer_start = idx + 1             # <<<<<<<<<<<<<<
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-          /* "streaming_form_data/_parser.pyx":419
+          /* "streaming_form_data/_parser.pyx":429
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  *                     if match_start >= buffer_start:             # <<<<<<<<<<<<<<
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-        /* "streaming_form_data/_parser.pyx":428
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  *                         buffer_start = idx + 1
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- *                         return ErrorGroup.Internal + 2
+ *                         return ErrorCode.E_INTERNAL
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+          __pyx_t_7 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 438, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":429
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  *                         self.mark_error()
- *                         return ErrorGroup.Internal + 2             # <<<<<<<<<<<<<<
+ *                         return ErrorCode.E_INTERNAL             # <<<<<<<<<<<<<<
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  *                     self.unset_active_part()
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+          __pyx_t_7 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_INTERNAL); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 439, __pyx_L1_error)
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-        /* "streaming_form_data/_parser.pyx":431
- *                         return ErrorGroup.Internal + 2
+        /* "streaming_form_data/_parser.pyx":441
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  *                     self.unset_active_part()             # <<<<<<<<<<<<<<
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-        __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_unset_active_part); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 431, __pyx_L1_error)
+        __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_unset_active_part); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 441, __pyx_L1_error)
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@@ -17431,24 +17467,24 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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@@ -17458,17 +17494,17 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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@@ -17477,60 +17513,60 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-        /* "streaming_form_data/_parser.pyx":437
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-          /* "streaming_form_data/_parser.pyx":438
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-          /* "streaming_form_data/_parser.pyx":437
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  *                         self.mark_error()
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+ *                         return ErrorCode.E_INTERNAL
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-        /* "streaming_form_data/_parser.pyx":440
+        /* "streaming_form_data/_parser.pyx":450
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-        /* "streaming_form_data/_parser.pyx":442
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-          /* "streaming_form_data/_parser.pyx":443
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@@ -17556,20 +17592,20 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-              /* "streaming_form_data/_parser.pyx":444
+              /* "streaming_form_data/_parser.pyx":454
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@@ -17590,13 +17626,13 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-                if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 444, __pyx_L36_error)
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-              /* "streaming_form_data/_parser.pyx":443
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@@ -17615,7 +17651,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-            /* "streaming_form_data/_parser.pyx":445
+            /* "streaming_form_data/_parser.pyx":455
  *                         try:
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@@ -17625,23 +17661,23 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-              if (__Pyx_GetException(&__pyx_t_7, &__pyx_t_5, &__pyx_t_6) < 0) __PYX_ERR(0, 445, __pyx_L38_except_error)
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-              /* "streaming_form_data/_parser.pyx":446
+              /* "streaming_form_data/_parser.pyx":456
  *                             self.on_body(chunk[buffer_start: match_start])
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  *                             self.mark_error()             # <<<<<<<<<<<<<<
  *                             raise
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-              __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 446, __pyx_L38_except_error)
+              __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 456, __pyx_L38_except_error)
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-              /* "streaming_form_data/_parser.pyx":447
+              /* "streaming_form_data/_parser.pyx":457
  *                         except Exception:
  *                             self.mark_error()
  *                             raise             # <<<<<<<<<<<<<<
@@ -17653,11 +17689,11 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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             goto __pyx_L38_except_error;
 
-            /* "streaming_form_data/_parser.pyx":443
+            /* "streaming_form_data/_parser.pyx":453
  * 
  *                     if match_start >= buffer_start:
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@@ -17673,7 +17709,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-          /* "streaming_form_data/_parser.pyx":442
+          /* "streaming_form_data/_parser.pyx":452
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  *                     if match_start >= buffer_start:             # <<<<<<<<<<<<<<
@@ -17683,27 +17719,27 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
           goto __pyx_L35;
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-        /* "streaming_form_data/_parser.pyx":449
+        /* "streaming_form_data/_parser.pyx":459
  *                             raise
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  *                         self.mark_error()             # <<<<<<<<<<<<<<
- *                         return ErrorGroup.Internal + 4
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+          __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 459, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":450
+          /* "streaming_form_data/_parser.pyx":460
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  *                         self.mark_error()
- *                         return ErrorGroup.Internal + 4             # <<<<<<<<<<<<<<
+ *                         return ErrorCode.E_INTERNAL             # <<<<<<<<<<<<<<
  * 
  *                     buffer_start = idx + 1
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           __Pyx_XDECREF(__pyx_r);
-          __pyx_t_6 = __Pyx_PyInt_From_long((__pyx_e_19streaming_form_data_7_parser_Internal + 4)); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 450, __pyx_L1_error)
+          __pyx_t_6 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_INTERNAL); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 460, __pyx_L1_error)
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@@ -17711,8 +17747,8 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
         }
         __pyx_L35:;
 
-        /* "streaming_form_data/_parser.pyx":452
- *                         return ErrorGroup.Internal + 4
+        /* "streaming_form_data/_parser.pyx":462
+ *                         return ErrorCode.E_INTERNAL
  * 
  *                     buffer_start = idx + 1             # <<<<<<<<<<<<<<
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@@ -17720,14 +17756,14 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-        /* "streaming_form_data/_parser.pyx":454
+        /* "streaming_form_data/_parser.pyx":464
  *                     buffer_start = idx + 1
  * 
  *                     self.unset_active_part()             # <<<<<<<<<<<<<<
  *                     self.ender_finder.reset()
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  */
-        __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_unset_active_part); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 454, __pyx_L1_error)
+        __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_unset_active_part); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 464, __pyx_L1_error)
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@@ -17747,24 +17783,24 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-          if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 454, __pyx_L1_error)
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-        /* "streaming_form_data/_parser.pyx":455
+        /* "streaming_form_data/_parser.pyx":465
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  *                     self.unset_active_part()
  *                     self.ender_finder.reset()             # <<<<<<<<<<<<<<
  * 
  *                 else:
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-        __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->ender_finder->__pyx_vtab)->reset(__pyx_v_self->ender_finder); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 455, __pyx_L1_error)
+        __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->ender_finder->__pyx_vtab)->reset(__pyx_v_self->ender_finder); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 465, __pyx_L1_error)
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-        /* "streaming_form_data/_parser.pyx":434
+        /* "streaming_form_data/_parser.pyx":444
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  *                 elif self.ender_finder.found():             # <<<<<<<<<<<<<<
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         goto __pyx_L21;
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-      /* "streaming_form_data/_parser.pyx":463
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  *                     if self.delimiter_finder.inactive():             # <<<<<<<<<<<<<<
@@ -17782,20 +17818,20 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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+        __pyx_t_9 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->inactive(__pyx_v_self->delimiter_finder, 0); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 473, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":464
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-          __pyx_t_14 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->rewind_fast_forward(__pyx_v_self, __pyx_v_chunk_ptr, (__pyx_v_idx + 1), (__pyx_v_chunk_len - 1)); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 464, __pyx_L1_error)
+          __pyx_t_14 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->rewind_fast_forward(__pyx_v_self, __pyx_v_chunk_ptr, (__pyx_v_idx + 1), (__pyx_v_chunk_len - 1)); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 474, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":467
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-          /* "streaming_form_data/_parser.pyx":463
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  *                     if self.delimiter_finder.inactive():             # <<<<<<<<<<<<<<
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-      /* "streaming_form_data/_parser.pyx":406
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  *                 self.state = ParserState.PS_READING_BODY
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@@ -17825,48 +17861,50 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-      /* "streaming_form_data/_parser.pyx":470
+      /* "streaming_form_data/_parser.pyx":480
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- *                 return 0             # <<<<<<<<<<<<<<
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       __Pyx_XDECREF(__pyx_r);
-      __Pyx_INCREF(__pyx_int_0);
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-      /* "streaming_form_data/_parser.pyx":469
+      /* "streaming_form_data/_parser.pyx":479
  *                         idx += skip_count
  * 
  *             elif self.state == ParserState.PS_END:             # <<<<<<<<<<<<<<
- *                 return 0
+ *                 return ErrorCode.E_OK
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-      /* "streaming_form_data/_parser.pyx":472
- *                 return 0
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+ *                 return ErrorCode.E_OK
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- *                 return ErrorGroup.Internal + 5
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-      /* "streaming_form_data/_parser.pyx":473
+      /* "streaming_form_data/_parser.pyx":483
  *             else:
  *                 self.mark_error()
- *                 return ErrorGroup.Internal + 5             # <<<<<<<<<<<<<<
+ *                 return ErrorCode.E_INTERNAL             # <<<<<<<<<<<<<<
  * 
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@@ -17874,8 +17912,8 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
       break;
     }
 
-    /* "streaming_form_data/_parser.pyx":475
- *                 return ErrorGroup.Internal + 5
+    /* "streaming_form_data/_parser.pyx":485
+ *                 return ErrorCode.E_INTERNAL
  * 
  *             idx += 1             # <<<<<<<<<<<<<<
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@@ -17884,96 +17922,96 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-  /* "streaming_form_data/_parser.pyx":477
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  *             idx += 1
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  *         if idx != chunk_len:             # <<<<<<<<<<<<<<
  *             self.mark_error()
- *             return ErrorGroup.Internal + 6
+ *             return ErrorCode.E_INTERNAL
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-    /* "streaming_form_data/_parser.pyx":478
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  *             self.mark_error()             # <<<<<<<<<<<<<<
- *             return ErrorGroup.Internal + 6
+ *             return ErrorCode.E_INTERNAL
  * 
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-    /* "streaming_form_data/_parser.pyx":479
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  *             self.mark_error()
- *             return ErrorGroup.Internal + 6             # <<<<<<<<<<<<<<
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-    /* "streaming_form_data/_parser.pyx":477
+    /* "streaming_form_data/_parser.pyx":487
  *             idx += 1
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  *         if idx != chunk_len:             # <<<<<<<<<<<<<<
  *             self.mark_error()
- *             return ErrorGroup.Internal + 6
+ *             return ErrorCode.E_INTERNAL
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-  /* "streaming_form_data/_parser.pyx":481
- *             return ErrorGroup.Internal + 6
+  /* "streaming_form_data/_parser.pyx":491
+ *             return ErrorCode.E_INTERNAL
  * 
  *         if buffer_start > chunk_len:             # <<<<<<<<<<<<<<
  *             self.mark_error()
- *             return ErrorGroup.Internal + 7
+ *             return ErrorCode.E_INTERNAL
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-    /* "streaming_form_data/_parser.pyx":482
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  * 
  *         if buffer_start > chunk_len:
  *             self.mark_error()             # <<<<<<<<<<<<<<
- *             return ErrorGroup.Internal + 7
+ *             return ErrorCode.E_INTERNAL
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-    __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 482, __pyx_L1_error)
+    __pyx_t_6 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 492, __pyx_L1_error)
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-    /* "streaming_form_data/_parser.pyx":483
+    /* "streaming_form_data/_parser.pyx":493
  *         if buffer_start > chunk_len:
  *             self.mark_error()
- *             return ErrorGroup.Internal + 7             # <<<<<<<<<<<<<<
+ *             return ErrorCode.E_INTERNAL             # <<<<<<<<<<<<<<
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+    __pyx_t_6 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_INTERNAL); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 493, __pyx_L1_error)
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-    /* "streaming_form_data/_parser.pyx":481
- *             return ErrorGroup.Internal + 6
+    /* "streaming_form_data/_parser.pyx":491
+ *             return ErrorCode.E_INTERNAL
  * 
  *         if buffer_start > chunk_len:             # <<<<<<<<<<<<<<
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- *             return ErrorGroup.Internal + 7
+ *             return ErrorCode.E_INTERNAL
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-  /* "streaming_form_data/_parser.pyx":485
- *             return ErrorGroup.Internal + 7
+  /* "streaming_form_data/_parser.pyx":495
+ *             return ErrorCode.E_INTERNAL
  * 
  *         if self.state == ParserState.PS_READING_BODY:             # <<<<<<<<<<<<<<
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@@ -17982,25 +18020,25 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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   if (__pyx_t_9) {
 
-    /* "streaming_form_data/_parser.pyx":488
+    /* "streaming_form_data/_parser.pyx":498
  *             matched_length = max(
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  *                 self.ender_finder.matched_length()             # <<<<<<<<<<<<<<
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+    __pyx_t_14 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->ender_finder->__pyx_vtab)->matched_length(__pyx_v_self->ender_finder); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 498, __pyx_L1_error)
 
-    /* "streaming_form_data/_parser.pyx":487
+    /* "streaming_form_data/_parser.pyx":497
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-    __pyx_t_15 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->matched_length(__pyx_v_self->delimiter_finder); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 487, __pyx_L1_error)
+    __pyx_t_15 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->matched_length(__pyx_v_self->delimiter_finder); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 497, __pyx_L1_error)
 
-    /* "streaming_form_data/_parser.pyx":488
+    /* "streaming_form_data/_parser.pyx":498
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@@ -18015,7 +18053,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
     }
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-    /* "streaming_form_data/_parser.pyx":490
+    /* "streaming_form_data/_parser.pyx":500
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  *             match_start = idx - matched_length             # <<<<<<<<<<<<<<
@@ -18024,7 +18062,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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     __pyx_v_match_start = (__pyx_v_idx - __pyx_v_matched_length);
 
-    /* "streaming_form_data/_parser.pyx":492
+    /* "streaming_form_data/_parser.pyx":502
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  * 
  *             if match_start >= buffer_start + c_min_file_body_chunk_size:             # <<<<<<<<<<<<<<
@@ -18034,7 +18072,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-      /* "streaming_form_data/_parser.pyx":493
+      /* "streaming_form_data/_parser.pyx":503
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  *             if match_start >= buffer_start + c_min_file_body_chunk_size:
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@@ -18050,20 +18088,20 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-          /* "streaming_form_data/_parser.pyx":494
+          /* "streaming_form_data/_parser.pyx":504
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+          __pyx_t_5 = __Pyx_PyObject_GetAttrStr(((PyObject *)__pyx_v_self), __pyx_n_s_on_body); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 504, __pyx_L51_error)
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-          __pyx_t_7 = PySequence_GetSlice(__pyx_v_chunk, __pyx_v_buffer_start, __pyx_v_match_start); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 494, __pyx_L51_error)
+          __pyx_t_7 = PySequence_GetSlice(__pyx_v_chunk, __pyx_v_buffer_start, __pyx_v_match_start); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 504, __pyx_L51_error)
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@@ -18084,13 +18122,13 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-          /* "streaming_form_data/_parser.pyx":493
+          /* "streaming_form_data/_parser.pyx":503
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@@ -18109,7 +18147,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-        /* "streaming_form_data/_parser.pyx":495
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@@ -18119,23 +18157,23 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-          if (__Pyx_GetException(&__pyx_t_6, &__pyx_t_5, &__pyx_t_7) < 0) __PYX_ERR(0, 495, __pyx_L53_except_error)
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-          /* "streaming_form_data/_parser.pyx":496
+          /* "streaming_form_data/_parser.pyx":506
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-          __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 496, __pyx_L53_except_error)
+          __pyx_t_4 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser__Parser *)__pyx_v_self->__pyx_vtab)->mark_error(__pyx_v_self); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 506, __pyx_L53_except_error)
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-          /* "streaming_form_data/_parser.pyx":497
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@@ -18147,11 +18185,11 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-        /* "streaming_form_data/_parser.pyx":493
+        /* "streaming_form_data/_parser.pyx":503
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-      /* "streaming_form_data/_parser.pyx":499
+      /* "streaming_form_data/_parser.pyx":509
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@@ -18176,7 +18214,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-      /* "streaming_form_data/_parser.pyx":492
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-    /* "streaming_form_data/_parser.pyx":485
- *             return ErrorGroup.Internal + 7
+    /* "streaming_form_data/_parser.pyx":495
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  *         if self.state == ParserState.PS_READING_BODY:             # <<<<<<<<<<<<<<
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@@ -18194,7 +18232,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-  /* "streaming_form_data/_parser.pyx":501
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@@ -18204,18 +18242,18 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
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-    /* "streaming_form_data/_parser.pyx":502
+    /* "streaming_form_data/_parser.pyx":512
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  *         if idx - buffer_start > 0:
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- *         return 0
+ *         return ErrorCode.E_OK
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+      __PYX_ERR(0, 512, __pyx_L1_error)
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-    __pyx_t_7 = PySequence_GetSlice(__pyx_v_chunk, __pyx_v_buffer_start, __pyx_v_idx); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 502, __pyx_L1_error)
+    __pyx_t_7 = PySequence_GetSlice(__pyx_v_chunk, __pyx_v_buffer_start, __pyx_v_idx); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 512, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_7);
     __Pyx_GIVEREF(__pyx_t_7);
     __Pyx_GOTREF(__pyx_v_self->_leftover_buffer);
@@ -18223,7 +18261,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
     __pyx_v_self->_leftover_buffer = ((PyObject*)__pyx_t_7);
     __pyx_t_7 = 0;
 
-    /* "streaming_form_data/_parser.pyx":501
+    /* "streaming_form_data/_parser.pyx":511
  *                 buffer_start = match_start
  * 
  *         if idx - buffer_start > 0:             # <<<<<<<<<<<<<<
@@ -18232,19 +18270,21 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
  */
   }
 
-  /* "streaming_form_data/_parser.pyx":504
+  /* "streaming_form_data/_parser.pyx":514
  *             self._leftover_buffer = chunk[buffer_start: idx]
  * 
- *         return 0             # <<<<<<<<<<<<<<
+ *         return ErrorCode.E_OK             # <<<<<<<<<<<<<<
  * 
  *     # rewind_fast_forward searches for the '\r\n--' sequence in the provided
  */
   __Pyx_XDECREF(__pyx_r);
-  __Pyx_INCREF(__pyx_int_0);
-  __pyx_r = __pyx_int_0;
+  __pyx_t_7 = __Pyx_Enum_77593a__19streaming_form_data_7_parser_enum__dunderpyx_t_19streaming_form_data_7_parser_ErrorCode__etc_to_py(__pyx_e_19streaming_form_data_7_parser_E_OK); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 514, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_t_7);
+  __pyx_r = __pyx_t_7;
+  __pyx_t_7 = 0;
   goto __pyx_L0;
 
-  /* "streaming_form_data/_parser.pyx":298
+  /* "streaming_form_data/_parser.pyx":308
  *         return (chunk, index)
  * 
  *     def _parse(self, bytes chunk, size_t index):             # <<<<<<<<<<<<<<
@@ -18271,7 +18311,7 @@ static PyObject *__pyx_pf_19streaming_form_data_7_parser_7_Parser_24_parse(struc
   return __pyx_r;
 }
 
-/* "streaming_form_data/_parser.pyx":511
+/* "streaming_form_data/_parser.pyx":521
  *     # update Finder object states.
  * 
  *     cdef size_t rewind_fast_forward(             # <<<<<<<<<<<<<<
@@ -18293,7 +18333,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("rewind_fast_forward", 1);
 
-  /* "streaming_form_data/_parser.pyx":519
+  /* "streaming_form_data/_parser.pyx":529
  * 
  *         # we need at least 4 characters in buffer
  *         if pos_first + 3 > pos_last:             # <<<<<<<<<<<<<<
@@ -18303,7 +18343,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
   __pyx_t_1 = ((__pyx_v_pos_first + 3) > __pyx_v_pos_last);
   if (__pyx_t_1) {
 
-    /* "streaming_form_data/_parser.pyx":520
+    /* "streaming_form_data/_parser.pyx":530
  *         # we need at least 4 characters in buffer
  *         if pos_first + 3 > pos_last:
  *             return 0             # <<<<<<<<<<<<<<
@@ -18313,7 +18353,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
     __pyx_r = 0;
     goto __pyx_L0;
 
-    /* "streaming_form_data/_parser.pyx":519
+    /* "streaming_form_data/_parser.pyx":529
  * 
  *         # we need at least 4 characters in buffer
  *         if pos_first + 3 > pos_last:             # <<<<<<<<<<<<<<
@@ -18322,7 +18362,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
   }
 
-  /* "streaming_form_data/_parser.pyx":524
+  /* "streaming_form_data/_parser.pyx":534
  *         # calculate pointer to the first character of the buffer and the
  *         # pointer to a character after the end of the buffer
  *         ptr = chunk_ptr + pos_first + 3             # <<<<<<<<<<<<<<
@@ -18331,7 +18371,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
   __pyx_v_ptr = ((__pyx_v_chunk_ptr + __pyx_v_pos_first) + 3);
 
-  /* "streaming_form_data/_parser.pyx":525
+  /* "streaming_form_data/_parser.pyx":535
  *         # pointer to a character after the end of the buffer
  *         ptr = chunk_ptr + pos_first + 3
  *         ptr_end = chunk_ptr + pos_last + 1             # <<<<<<<<<<<<<<
@@ -18340,7 +18380,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
   __pyx_v_ptr_end = ((__pyx_v_chunk_ptr + __pyx_v_pos_last) + 1);
 
-  /* "streaming_form_data/_parser.pyx":526
+  /* "streaming_form_data/_parser.pyx":536
  *         ptr = chunk_ptr + pos_first + 3
  *         ptr_end = chunk_ptr + pos_last + 1
  *         skipped = 0             # <<<<<<<<<<<<<<
@@ -18349,7 +18389,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
   __pyx_v_skipped = 0;
 
-  /* "streaming_form_data/_parser.pyx":533
+  /* "streaming_form_data/_parser.pyx":543
  *         # is found.
  * 
  *         while True:             # <<<<<<<<<<<<<<
@@ -18358,7 +18398,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
   while (1) {
 
-    /* "streaming_form_data/_parser.pyx":534
+    /* "streaming_form_data/_parser.pyx":544
  * 
  *         while True:
  *             if ptr >= ptr_end:             # <<<<<<<<<<<<<<
@@ -18368,7 +18408,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
     __pyx_t_1 = (__pyx_v_ptr >= __pyx_v_ptr_end);
     if (__pyx_t_1) {
 
-      /* "streaming_form_data/_parser.pyx":537
+      /* "streaming_form_data/_parser.pyx":547
  *                 # normalize pointer value because we could jump few characters
  *                 # past the buffer end
  *                 ptr = ptr_end - 1             # <<<<<<<<<<<<<<
@@ -18377,7 +18417,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
       __pyx_v_ptr = (__pyx_v_ptr_end - 1);
 
-      /* "streaming_form_data/_parser.pyx":542
+      /* "streaming_form_data/_parser.pyx":552
  *                 # keep up to 3 characters in the buffer until next chunk
  *                 # guess we will skip all characters in the buffer
  *                 skipped = pos_last - pos_first + 1             # <<<<<<<<<<<<<<
@@ -18386,7 +18426,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
       __pyx_v_skipped = ((__pyx_v_pos_last - __pyx_v_pos_first) + 1);
 
-      /* "streaming_form_data/_parser.pyx":544
+      /* "streaming_form_data/_parser.pyx":554
  *                 skipped = pos_last - pos_first + 1
  * 
  *                 if ptr[0] == c_cr:             # <<<<<<<<<<<<<<
@@ -18396,7 +18436,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
       __pyx_t_1 = ((__pyx_v_ptr[0]) == __pyx_v_19streaming_form_data_7_parser_c_cr);
       if (__pyx_t_1) {
 
-        /* "streaming_form_data/_parser.pyx":545
+        /* "streaming_form_data/_parser.pyx":555
  * 
  *                 if ptr[0] == c_cr:
  *                     skipped = skipped - 1             # <<<<<<<<<<<<<<
@@ -18405,7 +18445,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
         __pyx_v_skipped = (__pyx_v_skipped - 1);
 
-        /* "streaming_form_data/_parser.pyx":544
+        /* "streaming_form_data/_parser.pyx":554
  *                 skipped = pos_last - pos_first + 1
  * 
  *                 if ptr[0] == c_cr:             # <<<<<<<<<<<<<<
@@ -18415,7 +18455,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
         goto __pyx_L7;
       }
 
-      /* "streaming_form_data/_parser.pyx":546
+      /* "streaming_form_data/_parser.pyx":556
  *                 if ptr[0] == c_cr:
  *                     skipped = skipped - 1
  *                 elif ptr[0] == c_lf and ptr[-1] == c_cr:             # <<<<<<<<<<<<<<
@@ -18433,7 +18473,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
       __pyx_L8_bool_binop_done:;
       if (__pyx_t_1) {
 
-        /* "streaming_form_data/_parser.pyx":547
+        /* "streaming_form_data/_parser.pyx":557
  *                     skipped = skipped - 1
  *                 elif ptr[0] == c_lf and ptr[-1] == c_cr:
  *                     skipped = skipped - 2             # <<<<<<<<<<<<<<
@@ -18442,7 +18482,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
         __pyx_v_skipped = (__pyx_v_skipped - 2);
 
-        /* "streaming_form_data/_parser.pyx":546
+        /* "streaming_form_data/_parser.pyx":556
  *                 if ptr[0] == c_cr:
  *                     skipped = skipped - 1
  *                 elif ptr[0] == c_lf and ptr[-1] == c_cr:             # <<<<<<<<<<<<<<
@@ -18452,7 +18492,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
         goto __pyx_L7;
       }
 
-      /* "streaming_form_data/_parser.pyx":549
+      /* "streaming_form_data/_parser.pyx":559
  *                     skipped = skipped - 2
  *                 elif (
  *                     ptr[0] == c_hyphen             # <<<<<<<<<<<<<<
@@ -18466,7 +18506,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
         goto __pyx_L10_bool_binop_done;
       }
 
-      /* "streaming_form_data/_parser.pyx":550
+      /* "streaming_form_data/_parser.pyx":560
  *                 elif (
  *                     ptr[0] == c_hyphen
  *                     and ptr[-1] == c_lf             # <<<<<<<<<<<<<<
@@ -18480,7 +18520,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
         goto __pyx_L10_bool_binop_done;
       }
 
-      /* "streaming_form_data/_parser.pyx":551
+      /* "streaming_form_data/_parser.pyx":561
  *                     ptr[0] == c_hyphen
  *                     and ptr[-1] == c_lf
  *                     and ptr[-2] == c_cr             # <<<<<<<<<<<<<<
@@ -18491,7 +18531,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
       __pyx_t_1 = __pyx_t_2;
       __pyx_L10_bool_binop_done:;
 
-      /* "streaming_form_data/_parser.pyx":548
+      /* "streaming_form_data/_parser.pyx":558
  *                 elif ptr[0] == c_lf and ptr[-1] == c_cr:
  *                     skipped = skipped - 2
  *                 elif (             # <<<<<<<<<<<<<<
@@ -18500,7 +18540,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
       if (__pyx_t_1) {
 
-        /* "streaming_form_data/_parser.pyx":553
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  */
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-        /* "streaming_form_data/_parser.pyx":548
+        /* "streaming_form_data/_parser.pyx":558
  *                 elif ptr[0] == c_lf and ptr[-1] == c_cr:
  *                     skipped = skipped - 2
  *                 elif (             # <<<<<<<<<<<<<<
@@ -18519,7 +18559,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
       }
       __pyx_L7:;
 
-      /* "streaming_form_data/_parser.pyx":554
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  *                 ):
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  *                 break             # <<<<<<<<<<<<<<
@@ -18528,7 +18568,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
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       goto __pyx_L5_break;
 
-      /* "streaming_form_data/_parser.pyx":534
+      /* "streaming_form_data/_parser.pyx":544
  * 
  *         while True:
  *             if ptr >= ptr_end:             # <<<<<<<<<<<<<<
@@ -18537,7 +18577,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
     }
 
-    /* "streaming_form_data/_parser.pyx":556
+    /* "streaming_form_data/_parser.pyx":566
  *                 break
  * 
  *             if ptr[0] != c_hyphen:             # <<<<<<<<<<<<<<
@@ -18547,7 +18587,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
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     if (__pyx_t_1) {
 
-      /* "streaming_form_data/_parser.pyx":557
+      /* "streaming_form_data/_parser.pyx":567
  * 
  *             if ptr[0] != c_hyphen:
  *                 ptr += 2             # <<<<<<<<<<<<<<
@@ -18556,7 +18596,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
       __pyx_v_ptr = (__pyx_v_ptr + 2);
 
-      /* "streaming_form_data/_parser.pyx":556
+      /* "streaming_form_data/_parser.pyx":566
  *                 break
  * 
  *             if ptr[0] != c_hyphen:             # <<<<<<<<<<<<<<
@@ -18566,7 +18606,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
       goto __pyx_L13;
     }
 
-    /* "streaming_form_data/_parser.pyx":559
+    /* "streaming_form_data/_parser.pyx":569
  *                 ptr += 2
  *             else:
  *                 if ptr[-1] != c_hyphen:             # <<<<<<<<<<<<<<
@@ -18577,7 +18617,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
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       if (__pyx_t_1) {
 
-        /* "streaming_form_data/_parser.pyx":560
+        /* "streaming_form_data/_parser.pyx":570
  *             else:
  *                 if ptr[-1] != c_hyphen:
  *                     ptr += 1             # <<<<<<<<<<<<<<
@@ -18586,7 +18626,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
  */
         __pyx_v_ptr = (__pyx_v_ptr + 1);
 
-        /* "streaming_form_data/_parser.pyx":559
+        /* "streaming_form_data/_parser.pyx":569
  *                 ptr += 2
  *             else:
  *                 if ptr[-1] != c_hyphen:             # <<<<<<<<<<<<<<
@@ -18596,7 +18636,7 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
         goto __pyx_L14;
       }
 
-      /* "streaming_form_data/_parser.pyx":562
+      /* "streaming_form_data/_parser.pyx":572
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  *                 else:
  *                     if ptr[-2] == c_lf and ptr[-3] == c_cr:             # <<<<<<<<<<<<<<
@@ -18615,117 +18655,117 @@ static size_t __pyx_f_19streaming_form_data_7_parser_7_Parser_rewind_fast_forwar
         __pyx_L16_bool_binop_done:;
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-          /* "streaming_form_data/_parser.pyx":563
+          /* "streaming_form_data/_parser.pyx":573
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  *                     if ptr[-2] == c_lf and ptr[-3] == c_cr:
  *                         self.delimiter_finder.reset()             # <<<<<<<<<<<<<<
  *                         self.delimiter_finder.feed(c_cr)
  *                         self.delimiter_finder.feed(c_lf)
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-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->reset(__pyx_v_self->delimiter_finder); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 563, __pyx_L1_error)
+          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->reset(__pyx_v_self->delimiter_finder); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 573, __pyx_L1_error)
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-          /* "streaming_form_data/_parser.pyx":564
+          /* "streaming_form_data/_parser.pyx":574
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  *                         self.delimiter_finder.feed(c_cr)             # <<<<<<<<<<<<<<
  *                         self.delimiter_finder.feed(c_lf)
  *                         self.delimiter_finder.feed(c_hyphen)
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-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_cr, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 564, __pyx_L1_error)
+          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_cr, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 574, __pyx_L1_error)
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           __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 
-          /* "streaming_form_data/_parser.pyx":565
+          /* "streaming_form_data/_parser.pyx":575
  *                         self.delimiter_finder.reset()
  *                         self.delimiter_finder.feed(c_cr)
  *                         self.delimiter_finder.feed(c_lf)             # <<<<<<<<<<<<<<
  *                         self.delimiter_finder.feed(c_hyphen)
  *                         self.delimiter_finder.feed(c_hyphen)
  */
-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_lf, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 565, __pyx_L1_error)
+          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_lf, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 575, __pyx_L1_error)
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           __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 
-          /* "streaming_form_data/_parser.pyx":566
+          /* "streaming_form_data/_parser.pyx":576
  *                         self.delimiter_finder.feed(c_cr)
  *                         self.delimiter_finder.feed(c_lf)
  *                         self.delimiter_finder.feed(c_hyphen)             # <<<<<<<<<<<<<<
  *                         self.delimiter_finder.feed(c_hyphen)
  * 
  */
-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_hyphen, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 566, __pyx_L1_error)
+          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_hyphen, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 576, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_3);
           __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 
-          /* "streaming_form_data/_parser.pyx":567
+          /* "streaming_form_data/_parser.pyx":577
  *                         self.delimiter_finder.feed(c_lf)
  *                         self.delimiter_finder.feed(c_hyphen)
  *                         self.delimiter_finder.feed(c_hyphen)             # <<<<<<<<<<<<<<
  * 
  *                         self.ender_finder.reset()
  */
-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_hyphen, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 567, __pyx_L1_error)
+          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->delimiter_finder->__pyx_vtab)->feed(__pyx_v_self->delimiter_finder, __pyx_v_19streaming_form_data_7_parser_c_hyphen, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 577, __pyx_L1_error)
           __Pyx_GOTREF(__pyx_t_3);
           __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 
-          /* "streaming_form_data/_parser.pyx":569
+          /* "streaming_form_data/_parser.pyx":579
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  *                         self.ender_finder.feed(c_cr)
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  *                         self.ender_finder.feed(c_lf)
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  *                         self.ender_finder.feed(c_hyphen)
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  *                         self.ender_finder.feed(c_lf)
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  *                         self.ender_finder.feed(c_hyphen)
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-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->ender_finder->__pyx_vtab)->feed(__pyx_v_self->ender_finder, __pyx_v_19streaming_form_data_7_parser_c_hyphen, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 572, __pyx_L1_error)
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  *                         self.ender_finder.feed(c_hyphen)             # <<<<<<<<<<<<<<
  * 
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-          __pyx_t_3 = ((struct __pyx_vtabstruct_19streaming_form_data_7_parser_Finder *)__pyx_v_self->ender_finder->__pyx_vtab)->feed(__pyx_v_self->ender_finder, __pyx_v_19streaming_form_data_7_parser_c_hyphen, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 573, __pyx_L1_error)
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-    /* "streaming_form_data/_parser.pyx":585
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  *         if self.active_part:             # <<<<<<<<<<<<<<
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-  /* "streaming_form_data/_parser.pyx":582
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  *     cdef mark_error(self):             # <<<<<<<<<<<<<<
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-    {&__pyx_n_s_ErrorGroup, __pyx_k_ErrorGroup, sizeof(__pyx_k_ErrorGroup), 0, 0, 1, 1},
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+    {&__pyx_kp_s_Error_codes_returned_by_the_par, __pyx_k_Error_codes_returned_by_the_par, sizeof(__pyx_k_Error_codes_returned_by_the_par), 0, 0, 1, 0},
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     {&__pyx_n_s_Parser_set_active_part, __pyx_k_Parser_set_active_part, sizeof(__pyx_k_Parser_set_active_part), 0, 0, 1, 1},
     {&__pyx_n_s_Parser_unset_active_part, __pyx_k_Parser_unset_active_part, sizeof(__pyx_k_Parser_unset_active_part), 0, 0, 1, 1},
     {&__pyx_n_s_Part, __pyx_k_Part, sizeof(__pyx_k_Part), 0, 0, 1, 1},
-    {&__pyx_n_s_PartHeaders, __pyx_k_PartHeaders, sizeof(__pyx_k_PartHeaders), 0, 0, 1, 1},
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@@ -23582,7 +23625,6 @@ static int __Pyx_CreateStringTabAndInitStrings(void) {
     {&__pyx_n_s_Pyx_FlagBase___new, __pyx_k_Pyx_FlagBase___new, sizeof(__pyx_k_Pyx_FlagBase___new), 0, 0, 1, 1},
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     {&__pyx_n_s_Pyx_FlagBase___str, __pyx_k_Pyx_FlagBase___str, sizeof(__pyx_k_Pyx_FlagBase___str), 0, 0, 1, 1},
-    {&__pyx_n_s_UnexpectedPart, __pyx_k_UnexpectedPart, sizeof(__pyx_k_UnexpectedPart), 0, 0, 1, 1},
     {&__pyx_kp_s_Unknown_enum_value_s, __pyx_k_Unknown_enum_value_s, sizeof(__pyx_k_Unknown_enum_value_s), 0, 0, 1, 0},
     {&__pyx_n_s_ValueError, __pyx_k_ValueError, sizeof(__pyx_k_ValueError), 0, 0, 1, 1},
     {&__pyx_kp_b__12, __pyx_k__12, sizeof(__pyx_k__12), 0, 0, 0, 0},
@@ -23724,7 +23766,7 @@ static int __Pyx_CreateStringTabAndInitStrings(void) {
 }
 /* #### Code section: cached_builtins ### */
 static CYTHON_SMALL_CODE int __Pyx_InitCachedBuiltins(void) {
-  __pyx_builtin_ValueError = __Pyx_GetBuiltinName(__pyx_n_s_ValueError); if (!__pyx_builtin_ValueError) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_builtin_ValueError = __Pyx_GetBuiltinName(__pyx_n_s_ValueError); if (!__pyx_builtin_ValueError) __PYX_ERR(0, 73, __pyx_L1_error)
   return 0;
   __pyx_L1_error:;
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-  /* "streaming_form_data/_parser.pyx":43
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-  __pyx_tuple__4 = PyTuple_Pack(1, __pyx_kp_u_Empty_values_not_allowed); if (unlikely(!__pyx_tuple__4)) __PYX_ERR(0, 43, __pyx_L1_error)
+  __pyx_tuple__4 = PyTuple_Pack(1, __pyx_kp_u_Empty_values_not_allowed); if (unlikely(!__pyx_tuple__4)) __PYX_ERR(0, 73, __pyx_L1_error)
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-  /* "streaming_form_data/_parser.pyx":51
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  *     cpdef feed(self, Byte byte):             # <<<<<<<<<<<<<<
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-  __pyx_tuple__31 = PyTuple_Pack(2, __pyx_n_s_self, __pyx_n_s_byte); if (unlikely(!__pyx_tuple__31)) __PYX_ERR(0, 51, __pyx_L1_error)
+  __pyx_tuple__31 = PyTuple_Pack(2, __pyx_n_s_self, __pyx_n_s_byte); if (unlikely(!__pyx_tuple__31)) __PYX_ERR(0, 81, __pyx_L1_error)
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-  /* "streaming_form_data/_parser.pyx":215
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-  /* "streaming_form_data/_parser.pyx":224
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-  /* "streaming_form_data/_parser.pyx":229
+  /* "streaming_form_data/_parser.pyx":239
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-  /* "streaming_form_data/_parser.pyx":234
+  /* "streaming_form_data/_parser.pyx":244
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-  /* "streaming_form_data/_parser.pyx":239
+  /* "streaming_form_data/_parser.pyx":249
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-  /* "streaming_form_data/_parser.pyx":244
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-  /* "streaming_form_data/_parser.pyx":248
+  /* "streaming_form_data/_parser.pyx":258
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-  /* "streaming_form_data/_parser.pyx":257
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-  /* "streaming_form_data/_parser.pyx":268
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  *     async def async_data_received(self, bytes data):             # <<<<<<<<<<<<<<
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-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_test, __pyx_t_4) < 0) __PYX_ERR(0, 1, __pyx_L1_error)
-  __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
+  __pyx_t_6 = __Pyx_PyDict_NewPresized(0); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 1, __pyx_L1_error)
+  __Pyx_GOTREF(__pyx_t_6);
+  if (PyDict_SetItem(__pyx_d, __pyx_n_s_test, __pyx_t_6) < 0) __PYX_ERR(0, 1, __pyx_L1_error)
+  __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
 
   /*--- Wrapped vars code ---*/
 
@@ -26234,6 +26358,7 @@ if (!__Pyx_RefNanny) {
   __Pyx_XDECREF(__pyx_t_5);
   __Pyx_XDECREF(__pyx_t_6);
   __Pyx_XDECREF(__pyx_t_7);
+  __Pyx_XDECREF(__pyx_t_8);
   if (__pyx_m) {
     if (__pyx_d && stringtab_initialized) {
       __Pyx_AddTraceback("init streaming_form_data._parser", __pyx_clineno, __pyx_lineno, __pyx_filename);
@@ -33844,31 +33969,31 @@ static void __Pyx_AddTraceback(const char *funcname, int c_line,
 }
 
 /* CIntToPy */
-  static CYTHON_INLINE PyObject* __Pyx_PyInt_From_enum____pyx_t_19streaming_form_data_7_parser_ErrorGroup(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup value) {
+  static CYTHON_INLINE PyObject* __Pyx_PyInt_From_enum____pyx_t_19streaming_form_data_7_parser_ErrorCode(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode value) {
 #ifdef __Pyx_HAS_GCC_DIAGNOSTIC
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wconversion"
 #endif
-    const enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup neg_one = (enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) -1, const_zero = (enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) 0;
+    const enum __pyx_t_19streaming_form_data_7_parser_ErrorCode neg_one = (enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) -1, const_zero = (enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) 0;
 #ifdef __Pyx_HAS_GCC_DIAGNOSTIC
 #pragma GCC diagnostic pop
 #endif
     const int is_unsigned = neg_one > const_zero;
     if (is_unsigned) {
-        if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) < sizeof(long)) {
+        if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) < sizeof(long)) {
             return PyInt_FromLong((long) value);
-        } else if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) <= sizeof(unsigned long)) {
+        } else if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) <= sizeof(unsigned long)) {
             return PyLong_FromUnsignedLong((unsigned long) value);
 #ifdef HAVE_LONG_LONG
-        } else if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) <= sizeof(unsigned PY_LONG_LONG)) {
+        } else if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) <= sizeof(unsigned PY_LONG_LONG)) {
             return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG) value);
 #endif
         }
     } else {
-        if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) <= sizeof(long)) {
+        if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) <= sizeof(long)) {
             return PyInt_FromLong((long) value);
 #ifdef HAVE_LONG_LONG
-        } else if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup) <= sizeof(PY_LONG_LONG)) {
+        } else if (sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode) <= sizeof(PY_LONG_LONG)) {
             return PyLong_FromLongLong((PY_LONG_LONG) value);
 #endif
         }
@@ -33877,14 +34002,14 @@ static void __Pyx_AddTraceback(const char *funcname, int c_line,
         int one = 1; int little = (int)*(unsigned char *)&one;
         unsigned char *bytes = (unsigned char *)&value;
 #if !CYTHON_COMPILING_IN_LIMITED_API && PY_VERSION_HEX < 0x030d0000
-        return _PyLong_FromByteArray(bytes, sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup),
+        return _PyLong_FromByteArray(bytes, sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode),
                                      little, !is_unsigned);
 #else
         PyObject *from_bytes, *result = NULL;
         PyObject *py_bytes = NULL, *arg_tuple = NULL, *kwds = NULL, *order_str = NULL;
         from_bytes = PyObject_GetAttrString((PyObject*)&PyLong_Type, "from_bytes");
         if (!from_bytes) return NULL;
-        py_bytes = PyBytes_FromStringAndSize((char*)bytes, sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorGroup));
+        py_bytes = PyBytes_FromStringAndSize((char*)bytes, sizeof(enum __pyx_t_19streaming_form_data_7_parser_ErrorCode));
         if (!py_bytes) goto limited_bad;
         order_str = PyUnicode_FromString(little ? "little" : "big");
         if (!order_str) goto limited_bad;
diff --git a/streaming_form_data/_parser.pyx b/streaming_form_data/_parser.pyx
index 8ce76570..ea4f4312 100644
--- a/streaming_form_data/_parser.pyx
+++ b/streaming_form_data/_parser.pyx
@@ -21,15 +21,45 @@ cdef enum FinderState:
     FS_START, FS_WORKING, FS_END
 
 
-# 100..199: internal program errors (asserts)
-# 200..299: problems with delimiting multipart stream into parts
-# 300..399: problems with parsing particular part headers
-# 400..499: problems with unregistered parts
-cpdef enum ErrorGroup:
-    Internal = 100
-    Delimiting = 200
-    PartHeaders = 300
-    UnexpectedPart = 400
+cpdef enum ErrorCode:
+    """
+    Error codes returned by the parser
+    """
+
+    # All good
+    E_OK,
+
+    # Internal program errors (asserts that should not fail)
+    E_INTERNAL,
+
+    # Problems with delimiting multipart stream into parts
+    E_DELIMITING,
+
+    # Problems with parsing specific part headers
+    E_PART_HEADERS,
+
+    # Problems with unregistered parts
+    E_UNEXPECTED_PART
+
+
+cdef enum ParserState:
+    PS_START,
+    PS_START_CR,
+
+    PS_STARTING_BOUNDARY,
+    PS_READING_BOUNDARY,
+    PS_ENDING_BOUNDARY,
+
+    PS_READING_HEADER,
+    PS_ENDING_HEADER,
+    PS_ENDED_HEADER,
+    PS_ENDING_ALL_HEADERS,
+
+    PS_READING_BODY,
+
+    PS_END,
+
+    PS_ERROR
 
 
 cdef class Finder:
@@ -159,26 +189,6 @@ cdef class AsyncPart:
             await target.finish()
 
 
-cdef enum ParserState:
-    PS_START,
-    PS_START_CR,
-
-    PS_STARTING_BOUNDARY,
-    PS_READING_BOUNDARY,
-    PS_ENDING_BOUNDARY,
-
-    PS_READING_HEADER,
-    PS_ENDING_HEADER,
-    PS_ENDED_HEADER,
-    PS_ENDING_ALL_HEADERS,
-
-    PS_READING_BODY,
-
-    PS_END,
-
-    PS_ERROR
-
-
 cdef class _Parser:
     cdef ParserState state
 
@@ -256,7 +266,7 @@ cdef class _Parser:
 
     def data_received(self, bytes data):
         if not data:
-            return 0
+            return ErrorCode.E_OK
 
         cdef bytes chunk
         cdef size_t index
@@ -267,7 +277,7 @@ cdef class _Parser:
 
     async def async_data_received(self, bytes data):
         if not data:
-            return 0
+            return ErrorCode.E_OK
 
         cdef bytes chunk
         cdef size_t index
@@ -317,19 +327,19 @@ cdef class _Parser:
                     self.state = ParserState.PS_START_CR
                 else:
                     self.mark_error()
-                    return ErrorGroup.Delimiting + 1
+                    return ErrorCode.E_DELIMITING
 
             elif self.state == ParserState.PS_START_CR:
                 if byte == c_lf:
                     self.state = ParserState.PS_START
                 else:
                     self.mark_error()
-                    return ErrorGroup.Delimiting + 4
+                    return ErrorCode.E_DELIMITING
 
             elif self.state == ParserState.PS_STARTING_BOUNDARY:
                 if byte != c_hyphen:
                     self.mark_error()
-                    return ErrorGroup.Delimiting + 2
+                    return ErrorCode.E_DELIMITING
 
                 self.state = ParserState.PS_READING_BOUNDARY
             elif self.state == ParserState.PS_READING_BOUNDARY:
@@ -339,12 +349,12 @@ cdef class _Parser:
             elif self.state == ParserState.PS_ENDING_BOUNDARY:
                 if byte != c_lf:
                     self.mark_error()
-                    return ErrorGroup.Delimiting + 3
+                    return ErrorCode.E_DELIMITING
 
                 # ensure we have read correct starting delimiter
                 if b"\r\n" + chunk[buffer_start: idx + 1] != self.delimiter_finder.target:
                     self.mark_error()
-                    return ErrorGroup.Delimiting + 5
+                    return ErrorCode.E_DELIMITING
 
                 buffer_start = idx + 1
 
@@ -356,7 +366,7 @@ cdef class _Parser:
             elif self.state == ParserState.PS_ENDING_HEADER:
                 if byte != c_lf:
                     self.mark_error()
-                    return ErrorGroup.PartHeaders + 1
+                    return ErrorCode.E_PART_HEADERS
 
                 message = Parser(policy=HTTP).parsestr(
                     chunk[buffer_start: idx + 1].decode("utf-8")
@@ -365,7 +375,7 @@ cdef class _Parser:
                 if "content-disposition" in message:
                     if not message.get_content_disposition() == "form-data":
                         self.mark_error()
-                        return ErrorGroup.PartHeaders + 1
+                        return ErrorCode.E_PART_HEADERS
 
                     params = message["content-disposition"].params
                     name = params.get("name")
@@ -377,7 +387,7 @@ cdef class _Parser:
                             if self.strict:
                                 self.unexpected_part_name = name
                                 self.mark_error()
-                                return ErrorGroup.UnexpectedPart
+                                return ErrorCode.E_UNEXPECTED_PART
 
                         self.set_active_part(part, params.get("filename"))
                 elif "content-type" in message:
@@ -398,7 +408,7 @@ cdef class _Parser:
             elif self.state == ParserState.PS_ENDING_ALL_HEADERS:
                 if byte != c_lf:
                     self.mark_error()
-                    return ErrorGroup.PartHeaders + 2
+                    return ErrorCode.E_PART_HEADERS
 
                 buffer_start = idx + 1
 
@@ -412,7 +422,7 @@ cdef class _Parser:
 
                     if idx + 1 < self.delimiter_length:
                         self.mark_error()
-                        return ErrorGroup.Internal + 1
+                        return ErrorCode.E_INTERNAL
 
                     match_start = idx + 1 - self.delimiter_length
 
@@ -426,7 +436,7 @@ cdef class _Parser:
                         buffer_start = idx + 1
                     else:
                         self.mark_error()
-                        return ErrorGroup.Internal + 2
+                        return ErrorCode.E_INTERNAL
 
                     self.unset_active_part()
                     self.delimiter_finder.reset()
@@ -436,7 +446,7 @@ cdef class _Parser:
 
                     if idx + 1 < self.ender_length:
                         self.mark_error()
-                        return ErrorGroup.Internal + 3
+                        return ErrorCode.E_INTERNAL
                     match_start = idx + 1 - self.ender_length
 
                     if match_start >= buffer_start:
@@ -447,7 +457,7 @@ cdef class _Parser:
                             raise
                     else:
                         self.mark_error()
-                        return ErrorGroup.Internal + 4
+                        return ErrorCode.E_INTERNAL
 
                     buffer_start = idx + 1
 
@@ -467,20 +477,20 @@ cdef class _Parser:
                         idx += skip_count
 
             elif self.state == ParserState.PS_END:
-                return 0
+                return ErrorCode.E_OK
             else:
                 self.mark_error()
-                return ErrorGroup.Internal + 5
+                return ErrorCode.E_INTERNAL
 
             idx += 1
 
         if idx != chunk_len:
             self.mark_error()
-            return ErrorGroup.Internal + 6
+            return ErrorCode.E_INTERNAL
 
         if buffer_start > chunk_len:
             self.mark_error()
-            return ErrorGroup.Internal + 7
+            return ErrorCode.E_INTERNAL
 
         if self.state == ParserState.PS_READING_BODY:
             matched_length = max(
@@ -501,7 +511,7 @@ cdef class _Parser:
         if idx - buffer_start > 0:
             self._leftover_buffer = chunk[buffer_start: idx]
 
-        return 0
+        return ErrorCode.E_OK
 
     # rewind_fast_forward searches for the '\r\n--' sequence in the provided
     # buffer. It returns the number of characters which can be skipped before
@@ -511,6 +521,11 @@ cdef class _Parser:
     cdef size_t rewind_fast_forward(
         self, const Byte *chunk_ptr, size_t pos_first, size_t pos_last
     ):
+        """
+        Return the number of characters that can be skipped before the delimiter starts
+        (including potential 4-byte match). It may also update Finder object states.
+        """
+
         cdef const Byte *ptr
         cdef const Byte *ptr_end
         cdef size_t skipped
diff --git a/streaming_form_data/parser.py b/streaming_form_data/parser.py
index 38d7cb7d..29abc3f5 100644
--- a/streaming_form_data/parser.py
+++ b/streaming_form_data/parser.py
@@ -1,7 +1,7 @@
 from email.message import EmailMessage
 from typing import Mapping
 
-from streaming_form_data._parser import ErrorGroup, _Parser  # type: ignore
+from streaming_form_data._parser import ErrorCode, _Parser  # type: ignore
 from streaming_form_data.targets import BaseTarget
 
 
@@ -93,16 +93,16 @@ async def async_data_received(self, data: bytes):
         self._check(error_code)
 
     def _check(self, error_code: int):
-        if error_code == 0:
+        if error_code == ErrorCode.E_OK:
             return
 
-        if ErrorGroup.Internal <= error_code < ErrorGroup.Delimiting:
+        if error_code == ErrorCode.Internal:
             message = "internal errors"
-        elif ErrorGroup.Delimiting <= error_code < ErrorGroup.PartHeaders:
+        elif error_code == ErrorGroup.Delimiting:
             message = "delimiting multipart stream into parts"
-        elif ErrorGroup.PartHeaders <= error_code < ErrorGroup.UnexpectedPart:
+        elif error_code == ErrorGroup.PartHeaders:
             message = "parsing specific part headers"
-        elif ErrorGroup.UnexpectedPart == error_code:
+        elif error_code == ErrorGroup.UnexpectedPart:
             part = self._parser.unexpected_part_name
             raise UnexpectedPartException(
                 f"parsing unexpected part '{part}' in strict mode", part