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BinTextEnc.pas
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BinTextEnc.pas
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{-------------------------------------------------------------------------------
This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.
-------------------------------------------------------------------------------}
{===============================================================================
Binary data to text encoding and decoding
- Base16, Base32(Hex) and Base64(URL) encodings should be compliant with
RFC 4648
- Base85 encoding is using Z85 alphabet with undescore ("_", #95) as an
all-zero compression character
- Base16 corresponds to usual hexadecimal encoding
- Base10 only encodes to three-digit decimal number representing given byte
- when using Base85 and ASCII85, the decoded data migh end or start (in
case of reversed data reading) with zeroes that were not part of the
original data (a result of these encodings being block-based, these
zeroes are block padding)
Version 2.1.3 (2024-04-14)
Last change 2024-04-28
©2015-2024 František Milt
Contacts:
František Milt: [email protected]
Support:
If you find this code useful, please consider supporting its author(s) by
making a small donation using the following link(s):
https://www.paypal.me/FMilt
Changelog:
For detailed changelog and history please refer to this git repository:
github.com/TheLazyTomcat/Lib.BinTextEnc
Dependencies:
AuxClasses - github.com/TheLazyTomcat/Lib.AuxClasses
* AuxExceptions - github.com/TheLazyTomcat/Lib.AuxExceptions
AuxTypes - github.com/TheLazyTomcat/Lib.AuxTypes
StrRect - github.com/TheLazyTomcat/Lib.StrRect
Library AuxExceptions is required only when rebasing local exception classes
(see symbol BinTextEnc_UseAuxExceptions for details).
Library AuxExceptions might also be required as an indirect dependency.
Indirect dependencies:
SimpleCPUID - github.com/TheLazyTomcat/Lib.SimpleCPUID
UInt64Utils - github.com/TheLazyTomcat/Lib.UInt64Utils
WinFileInfo - github.com/TheLazyTomcat/Lib.WinFileInfo
===============================================================================}
unit BinTextEnc;
{
BinTextEnc_UseAuxExceptions
If you want library-specific exceptions to be based on more advanced classes
provided by AuxExceptions library instead of basic Exception class, and don't
want to or cannot change code in this unit, you can define global symbol
BinTextEnc_UseAuxExceptions to achieve this.
}
{$IF Defined(BinTextEnc_UseAuxExceptions)}
{$DEFINE UseAuxExceptions}
{$IFEND}
//------------------------------------------------------------------------------
{$IFDEF FPC}
{$MODE ObjFPC}
{$MODESWITCH DuplicateLocals+}
{$DEFINE FPC_DisableWarns}
{$MACRO ON}
{$ENDIF}
{$H+}
{$IFOPT Q+}
{$DEFINE OverflowChecks}
{$ENDIF}
interface
uses
SysUtils, Classes,
AuxTypes, AuxClasses{$IFDEF UseAuxExceptions}, AuxExceptions{$ENDIF};
{===============================================================================
Library-specific exceptions
===============================================================================}
type
EBTEException = class({$IFDEF UseAuxExceptions}EAEGeneralException{$ELSE}Exception{$ENDIF});
EBTEInvalidValue = class(EBTEException);
EBTEInvalidState = class(EBTEException);
EBTETooMuchData = class(EBTEException);
EBTEBufferTooSmall = class(EBTEException);
EBTEProcessingError = class(EBTEException);
{===============================================================================
--------------------------------------------------------------------------------
TBTETranscoder
--------------------------------------------------------------------------------
===============================================================================}
type
TBTEEncoding = (encUnknown,encBase2,encBase4,encBase8,encBase10,encBase16,
encBase32,encBase32Hex,encBase64,encBase64URL,encBase85,
encASCII85);
{
efReversible encoding supports reversed data reading
efPadding encoding supports padding
efCompression encoding supports compression
efTrim encoding supports trimming
efOutputSize it is possible to obtain length of encoded string or
size of decoded data
efSlowOutputSize same as efOutputSize, but the data/string must be
scanned to obtain the size, this can be slow
efInpreciseOutputSize reported encoded length or decoded size can be
inprecise (note that it will never be smaller), it is
usually rounded to some boundary (eg. block)
}
TBTEEncodingFeature = (efReversible,efPadding,efCompression,efTrim,
efOutputSize,efSlowOutputSize,efInpreciseOutputSize);
TBTEEncodingFeatures = set of TBTEEncodingFeature;
TBTEEncodingTable = array of Char;
TBTEDecodingTable = array[0..127] of Byte;
{===============================================================================
TBTETranscoder - class declaration
===============================================================================}
type
TBTETranscoder = class(TCustomObject)
protected
fEncodedString: String;
fIsProcessing: Boolean;
fBreakProcessing: Boolean;
// encoding settings
fHeader: Boolean;
fReversed: Boolean;
fPadding: Boolean;
fPaddingChar: Char;
fCompression: Boolean;
fCompressionChar: Char;
fTrim: Boolean;
// processing variables
fEncodedStringPos: TStrOff;
// events
fProgressCoef: Integer;
fOnProgressEvent: TFloatEvent;
fOnProgressCallback: TFloatCallback;
// getters/setters
Function GetEncodedString: String; virtual;
procedure SetEncodedString(const Value: String); virtual;
procedure SetPadding(Value: Boolean); virtual;
procedure SetReversed(Value: Boolean); virtual;
procedure SetPaddingChar(Value: Char); virtual;
procedure SetCompression(Value: Boolean); virtual;
procedure SetCompressionChar(Value: Char); virtual;
procedure SetTrim(Value: Boolean); virtual;
procedure SetHeader(Value: Boolean); virtual;
// events firing
procedure DoProgress(Progress: Double); virtual;
// initialization, finalization
procedure InitializeTable; virtual; abstract;
procedure Initialize; virtual;
procedure Finalize; virtual;
// header methods
class Function HeaderNumberExtract(const EncodedString: String; out HeaderNumber: UInt16): Boolean; virtual;
// auxiliary
Function ResolveDataPointer(Ptr: Pointer; Size: TMemSize; RevOffset: UInt32 = 1): Pointer; virtual;
procedure AdvanceDataPointer(var Ptr: Pointer; Delta: TMemSize = 1); virtual;
public
{
Use following to build encoding table type from other types.
}
class Function CreateEncodingTable(const Source: array of Char): TBTEEncodingTable; overload; virtual;
class Function CreateEncodingTable(const Source: String): TBTEEncodingTable; overload; virtual;
{
DataLimit returns maximum number of bytes that can be processed by a
particular encoder.
If you try to encode or even get encoded length for more data, an
EBTETooMuchData exception will be raised.
This limit is here to prevent potential out-of-memory errors and severe
rounding errors in some calculations when encoding.
Note that this limit changes for each encoding, and is selected so that
encoded string can reach a maximum of about 512M characters in length.
}
class Function DataLimit: TMemSize; virtual; abstract;
{
CharLimit sets limit on how long a string can be assigned to the property
EncodedString. If you try to assign longer string, an EBTETooMuchData
exception will be raised.
Currently it is always 512M characters.
}
class Function CharLimit: TStrSize; virtual;
{
Encoding returns what encoding the class is providing.
}
class Function Encoding: TBTEEncoding; virtual; abstract;
{
EncodingFeatures returns set of fetures the particular encoder or decoder
is supporting.
To test for support of specific feature, use the "in" set operator.
If the feature is supported, then the appropriate enumeration values will
be included, otherwise the value will not be included in the returned set.
See decription of type TBTEEncoding for detailed description of indvidual
features.
}
class Function EncodingFeatures: TBTEEncodingFeatures; virtual; abstract;
{
EncodingTableLength returns strict length of the encoding table (sometimes
also termed "alphabet").
}
class Function EncodingTableLength: Integer; virtual; abstract;
{
HeaderLength returns length, in characters, of the header that can be
stored at the beginning of encoded strings.
It will always return 6.
}
class Function HeaderLength: TStrSize; virtual;
{
HeaderPresent returns true when EncodedString starts with a substring that
can be an encoded string header. False otherwise.
When CheckEncoding is set to true, and the string contains a pattern
compatible with header, the function will also check whether the header
contains a valid encoding number or not.
}
class Function HeaderPresent(const EncodedString: String; CheckEncoding: Boolean = False): Boolean; virtual;
{
HeaderEncoding reads header from provided encoded string and returns which
encoding is stored in this header.
If the string does not contain a valid header or the stored encoding is not
known/valid, it will return encUnknown.
}
class Function HeaderEncoding(const EncodedString: String): TBTEEncoding; virtual;
{
HeaderReversed reads header from provided encoded string and returns whether
the encoded string was constructed with reversed data read (see description
of Reversed property for details) or not.
}
class Function HeaderReversed(const EncodedString: String): Boolean; virtual;
{
EncodingTableIsValid checs validity of passed encoding table.
It checks length of the table, ordinal values of all characters (must be
below or equal to 127), and that no character repeats. Note that some
encodings might require stricter rules, they are then checked too.
}
class Function EncodingTableIsValid(const EncodingTable: TBTEEncodingTable): Boolean; virtual;
constructor Create;
destructor Destroy; override;
Function BreakProcessing: Boolean; virtual;
// properties
property EncodedString: String read GetEncodedString write SetEncodedString;
property IsProcessing: Boolean read fIsProcessing;
{
Encoder
When set to true, the encoded string will start with a header sequence
that stores used encoding scheme and some other encoding options (namely
reversed flag).
Decoder
Read-only property (can be set to a different value, but that is of no
use).
Value of this property is set when decoding or when obtaining decoded
size. It is set to true when the encoded string contained a valid header,
false otherwise.
}
property Header: Boolean read fHeader write SetHeader;
{
Encoder
When set to true, then the data being encoded are read in reverse (from
the last byte/block to the first). When false, reading is done in normal
order (from first byte/block to last).
Decoder
If the encoded string contains a valid header, then this value is set
according to a reverse flag in this header (true when the flag is set,
false otherwise).
If you use encoded string that does NOT contain a header, then you must
set this property to a value used during encoding, otherwise the decoded
data will be completely wrong.
}
property Reversed: Boolean read fReversed write SetReversed;
{
Encoder
When set to true, and when the encoding supports padding, then the
produced encoded string will be padded (missing characters at the end
replaced by PaddingCharacter) to certain length.
Decoder
Read-only property.
Value is set when decoding or when obtaining decoded size. It is set to
true when the encoded string ends with one or more PaddingCharacter,
false otherwise.
Note that this does not reflect whether padding was active during
encoding, only whether there is padding character(s) or not.
}
property Padding: Boolean read fPadding write SetPadding;
property PaddingCharacter: Char read fPaddingChar write SetPaddingChar;
{
Encoder
When set to true, and when the encoding supports compression, then some
of the encoded data can be compressed when encoding.
Decoder
Read-only property.
Value is set when decoding or when obtaining decoded size. It is set to
true when the encoded string contains one or more CompressionCharacter,
false otherwise.
Note that this does not reflect whether compression was active during
encoding, only whether there is compression character(s) or not.
}
property Compression: Boolean read fCompression write SetCompression;
property CompressionCharacter: Char read fCompressionChar write SetCompressionChar;
{
Encoder
When set to true, and when the encoding supports trimming, then some
the resulting encoded string might be shortened by characters that are
not carrying any information about the encoded data.
Decoder
Read-only property.
Value is set when decoding or when obtaining decoded size. It is set to
true when the encoded string seems to be trimmed (is shorter than is
expected), false otherwise.
Note that this does not reflect whether trimming was active during
encoding, only whether there are some missing characters.
}
property Trim: Boolean read fTrim write SetTrim;
property ProgressCoefficient: Integer read fProgressCoef write fProgressCoef;
property OnProgressEvent: TFloatEvent read fOnProgressEvent write fOnProgressEvent;
property OnProgressCallback: TFloatCallback read fOnProgressCallback write fOnProgressCallback;
property OnProgress: TFloatEvent read fOnProgressEvent write fOnProgressEvent;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBTEEncoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBTEEncoder - class declaration
===============================================================================}
type
TBTEEncoder = class(TBTETranscoder)
protected
fEncodingTable: TBTEEncodingTable;
Function GetEncodingTable: TBTEEncodingTable; virtual;
procedure SetEncodingTable(const Value: TBTEEncodingTable); virtual;
procedure AssignEncodingTable(const EncodingTable: TBTEEncodingTable); virtual;
// processing
procedure WriteHeader; virtual;
procedure WriteChar(C: Char); virtual;
procedure WritePadding; virtual;
procedure Encode(const Buffer; Size: TMemSize); virtual;
procedure EncodeSpecific(const Buffer; Size: TMemSize); virtual; abstract;
public
// resulting string length
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; virtual; abstract;
Function EncodedLengthFromMemory(Mem: Pointer; Size: TMemSize): TStrSize; virtual;
Function EncodedLengthFromStream(Stream: TStream; Count: Int64 = -1): TStrSize; virtual;
Function EncodedLengthFromFile(const FileName: String): TStrSize; virtual;
// processing
procedure EncodeFromBuffer(const Buffer; Size: TMemSize); virtual;
procedure EncodeFromMemory(Mem: Pointer; Size: TMemSize); virtual;
procedure EncodeFromStream(Stream: TStream; Count: Int64 = -1); virtual;
procedure EncodeFromFile(const FileName: String); virtual;
property EncodingTable: TBTEEncodingTable read GetEncodingTable write SetEncodingTable;
end;
TBTEEncoderClass = class of TBTEEncoder;
{===============================================================================
--------------------------------------------------------------------------------
TBTEDecoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBTEDecoder - class declaration
===============================================================================}
type
TBTEDecoder = class(TBTETranscoder)
protected
fDecodingTable: TBTEDecodingTable;
// processing
procedure ReadHeader; virtual; // sets properties Header and Reversed (if header is present)
Function ReadChar: Char; virtual;
procedure RollBack; virtual;
Function ResolveChar(C: Char): Byte; virtual;
Function CountPadding: TStrSize; virtual;
procedure Decode(out Buffer; Size: TMemSize); virtual;
procedure DecodeSpecific(out Buffer; Size: TMemSize); virtual; abstract;
public
procedure ConstructDecodingTable(const EncodingTable: TBTEEncodingTable); virtual;
// resulting data size
Function DecodedSize: TMemSize; virtual; abstract; // sets properties Padding, Compression and Trim
//processing
Function DecodeIntoBuffer(out Buffer; Size: TMemSize): TMemSize; virtual;
Function DecodeIntoMemory(Mem: Pointer; Size: TMemSize): TMemSize; overload; virtual;
Function DecodeIntoMemory(out Mem: Pointer): TMemSize; overload; virtual;
Function DecodeIntoStream(Stream: TStream): TMemSize; virtual;
Function DecodeIntoFile(const FileName: String): TMemSize; virtual;
property DecodingTable: TBTEDecodingTable read fDecodingTable write fDecodingTable;
end;
TBTEDecoderClass = class of TBTEDecoder;
{===============================================================================
--------------------------------------------------------------------------------
TBase2Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase2Encoder - class declaration
===============================================================================}
type
TBase2Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase2Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase2Decoder - class declaration
===============================================================================}
type
TBase2Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase4Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase4Encoder - class declaration
===============================================================================}
type
TBase4Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase4Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase4Decoder - class declaration
===============================================================================}
type
TBase4Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase8Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase8Encoder - class declaration
===============================================================================}
type
TBase8Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase8Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase8Decoder - class declaration
===============================================================================}
type
TBase8Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase10Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase10Encoder - class declaration
===============================================================================}
type
TBase10Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase10Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase10Decoder - class declaration
===============================================================================}
type
TBase10Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase16Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase16Encoder - class declaration
===============================================================================}
type
TBase16Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase16Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase16Decoder - class declaration
===============================================================================}
type
TBase16Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase32Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase32Encoder - class declaration
===============================================================================}
type
TBase32Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase32Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase32Decoder - class declaration
===============================================================================}
type
TBase32Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase32HexEncoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase32HexEncoder - class declaration
===============================================================================}
type
TBase32HexEncoder = class(TBase32Encoder)
protected
procedure InitializeTable; override;
public
class Function Encoding: TBTEEncoding; override;
class Function EncodingTableLength: Integer; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase32HexDecoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase32HexDecoder - class declaration
===============================================================================}
type
TBase32HexDecoder = class(TBase32Decoder)
protected
procedure InitializeTable; override;
public
class Function Encoding: TBTEEncoding; override;
class Function EncodingTableLength: Integer; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase64Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase64Encoder - class declaration
===============================================================================}
type
TBase64Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase64Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase64Decoder - class declaration
===============================================================================}
type
TBase64Decoder = class(TBTEDecoder)
protected
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase64URLEncoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase64URLEncoder - class declaration
===============================================================================}
type
TBase64URLEncoder = class(TBase64Encoder)
protected
procedure InitializeTable; override;
public
class Function Encoding: TBTEEncoding; override;
class Function EncodingTableLength: Integer; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase64URLDecoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase64URLDecoder - class declaration
===============================================================================}
type
TBase64URLDecoder = class(TBase64Decoder)
protected
procedure InitializeTable; override;
public
class Function Encoding: TBTEEncoding; override;
class Function EncodingTableLength: Integer; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase85Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase85Encoder - class declaration
===============================================================================}
type
TBase85Encoder = class(TBTEEncoder)
protected
procedure InitializeTable; override;
procedure EncodeSpecific(const Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
class Function EncodingTableIsValid(const EncodingTable: TBTEEncodingTable): Boolean; override;
Function EncodedLengthFromBuffer(const Buffer; Size: TMemSize): TStrSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TBase85Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TBase85Decoder - class declaration
===============================================================================}
type
TBase85Decoder = class(TBTEDecoder)
protected
Function ReadChar: Char; override;
procedure InitializeTable; override;
procedure DecodeSpecific(out Buffer; Size: TMemSize); override;
public
class Function DataLimit: TMemSize; override;
class Function Encoding: TBTEEncoding; override;
class Function EncodingFeatures: TBTEEncodingFeatures; override;
class Function EncodingTableLength: Integer; override;
class Function EncodingTableIsValid(const EncodingTable: TBTEEncodingTable): Boolean; override;
Function DecodedSize: TMemSize; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TASCII85Encoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TASCII85Encoder - class declaration
===============================================================================}
type
TASCII85Encoder = class(TBase85Encoder)
protected
procedure InitializeTable; override;
public
class Function Encoding: TBTEEncoding; override;
class Function EncodingTableLength: Integer; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
TASCII85Decoder
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
TASCII85Decoder - class declaration
===============================================================================}
type
TASCII85Decoder = class(TBase85Decoder)
protected
procedure InitializeTable; override;
public
class Function Encoding: TBTEEncoding; override;
class Function EncodingTableLength: Integer; override;
end;
{===============================================================================
--------------------------------------------------------------------------------
Procedural interface
--------------------------------------------------------------------------------
===============================================================================}
{===============================================================================
Procedural interface - specialized functions declaration
===============================================================================}
Function EncodedLength_Base2(const Buffer; Size: TMemSize; Header: Boolean = False): TStrSize;
Function Encode_Base2(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False): String;
Function DecodedSize_Base2(const EncodedString: String): TMemSize;
Function Decode_Base2(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base4(const Buffer; Size: TMemSize; Header: Boolean = False): TStrSize;
Function Encode_Base4(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False): String;
Function DecodedSize_Base4(const EncodedString: String): TMemSize;
Function Decode_Base4(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base8(const Buffer; Size: TMemSize; Header: Boolean = False; Padding: Boolean = False): TStrSize;
Function Encode_Base8(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Padding: Boolean = False): String;
Function DecodedSize_Base8(const EncodedString: String): TMemSize;
Function Decode_Base8(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base10(const Buffer; Size: TMemSize; Header: Boolean = False): TStrSize;
Function Encode_Base10(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False): String;
Function DecodedSize_Base10(const EncodedString: String): TMemSize;
Function Decode_Base10(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base16(const Buffer; Size: TMemSize; Header: Boolean = False): TStrSize;
Function Encode_Base16(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False): String;
Function DecodedSize_Base16(const EncodedString: String): TMemSize;
Function Decode_Base16(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base32(const Buffer; Size: TMemSize; Header: Boolean = False; Padding: Boolean = False): TStrSize;
Function Encode_Base32(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Padding: Boolean = False): String;
Function DecodedSize_Base32(const EncodedString: String): TMemSize;
Function Decode_Base32(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base32Hex(const Buffer; Size: TMemSize; Header: Boolean = False; Padding: Boolean = False): TStrSize;
Function Encode_Base32Hex(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Padding: Boolean = False): String;
Function DecodedSize_Base32Hex(const EncodedString: String): TMemSize;
Function Decode_Base32Hex(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base64(const Buffer; Size: TMemSize; Header: Boolean = False; Padding: Boolean = False): TStrSize;
Function Encode_Base64(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Padding: Boolean = False): String;
Function DecodedSize_Base64(const EncodedString: String): TMemSize;
Function Decode_Base64(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base64URL(const Buffer; Size: TMemSize; Header: Boolean = False; Padding: Boolean = False): TStrSize;
Function Encode_Base64URL(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Padding: Boolean = False): String;
Function DecodedSize_Base64URL(const EncodedString: String): TMemSize;
Function Decode_Base64URL(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_Base85(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Compression: Boolean = False; Trim: Boolean = False): TStrSize;
Function Encode_Base85(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Compression: Boolean = False; Trim: Boolean = False): String;
Function DecodedSize_Base85(const EncodedString: String): TMemSize;
Function Decode_Base85(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
//------------------------------------------------------------------------------
Function EncodedLength_ASCII85(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Compression: Boolean = False; Trim: Boolean = False): TStrSize;
Function Encode_ASCII85(const Buffer; Size: TMemSize; Header: Boolean = False; Reversed: Boolean = False; Compression: Boolean = False; Trim: Boolean = False): String;
Function DecodedSize_ASCII85(const EncodedString: String): TMemSize;
Function Decode_ASCII85(const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize;
{===============================================================================
Procedural interface - universal functions declaration
===============================================================================}
Function EncodedLength(Encoding: TBTEEncoding; const Buffer; Size: TMemSize; Header: Boolean = False;
Reversed: Boolean = False; Padding: Boolean = False; Compression: Boolean = False; Trim: Boolean = False): TStrSize;
Function Encode(Encoding: TBTEEncoding; const Buffer; Size: TMemSize; Header: Boolean = False;
Reversed: Boolean = False; Padding: Boolean = False; Compression: Boolean = False; Trim: Boolean = False): String;
Function DecodedSize(Encoding: TBTEEncoding; const EncodedString: String): TMemSize; overload;
{
Buffer must be already allocated to accommodate all data (pass allocated size
in Size parameter). To get the required size, use function DecodedSize.
}
Function Decode(Encoding: TBTEEncoding; const EncodedString: String; out Buffer; Size: TMemSize; Reversed: Boolean = False): TMemSize; overload;
//------------------------------------------------------------------------------
// retuns encUnknown if the string does not contain a valid header
Function HeaderEncoding(const EncodedString: String): TBTEEncoding;
Function DecodedSize(const EncodedString: String): TMemSize; overload;
Function Decode(const EncodedString: String; out Buffer; Size: TMemSize): TMemSize; overload;
//------------------------------------------------------------------------------
Function EncoderFromEncoding(Encoding: TBTEEncoding): TBTEEncoderClass;