cfdjs_wasm_jsonapi.js

const ccallCfd = async function(module, func, returnType, argTypes, args) {
  const UTF8Decoder = typeof TextDecoder !== 'undefined' ? new TextDecoder('utf8') : undefined;
  const stringToUTF8Array = function(str, heap, outIdx, maxBytesToWrite) {
    if (!(maxBytesToWrite > 0)) return 0;
    const startIdx = outIdx;
    const endIdx = outIdx + maxBytesToWrite - 1;
    for (let i = 0; i < str.length; ++i) {
      let u;
      if (str.charCodeAt) {
        u = str.charCodeAt(i);
        if (u >= 55296 && u <= 57343) {
          const u1 = str.charCodeAt(++i);
          u = 65536 + ((u & 1023) << 10) | u1 & 1023;
        }
      } else {
        u = str[i];
        if (u >= 55296 && u <= 57343) {
          const u1 = str[++i];
          u = 65536 + ((u & 1023) << 10) | u1 & 1023;
        }
      }
      if (u <= 127) {
        if (outIdx >= endIdx) break;
        heap[outIdx++] = u;
      } else if (u <= 2047) {
        if (outIdx + 1 >= endIdx) break;
        heap[outIdx++] = 192 | u >> 6;
        heap[outIdx++] = 128 | u & 63;
      } else if (u <= 65535) {
        if (outIdx + 2 >= endIdx) break;
        heap[outIdx++] = 224 | u >> 12;
        heap[outIdx++] = 128 | u >> 6 & 63;
        heap[outIdx++] = 128 | u & 63;
      } else {
        if (outIdx + 3 >= endIdx) break;
        heap[outIdx++] = 240 | u >> 18;
        heap[outIdx++] = 128 | u >> 12 & 63;
        heap[outIdx++] = 128 | u >> 6 & 63;
        heap[outIdx++] = 128 | u & 63;
      }
    }
    heap[outIdx] = 0;
    return outIdx - startIdx;
  };
  const stringToUTF8 = function(str, outPtr, maxBytesToWrite) {
    return stringToUTF8Array(str, module['HEAPU8'], outPtr, maxBytesToWrite);
  };
  const UTF8ArrayToString = function(heap, idx, maxBytesToRead) {
    const endIdx = idx + maxBytesToRead;
    let endPtr = idx;
    let str = '';
    while (heap[endPtr] && !(endPtr >= endIdx)) ++endPtr;
    if (endPtr - idx > 16 && heap.subarray && UTF8Decoder) {
      return UTF8Decoder.decode(heap.subarray(idx, endPtr));
    } else {
      while (idx < endPtr) {
        let u0 = heap[idx++];
        if (!(u0 & 128)) {
          str += String.fromCharCode(u0);
          continue;
        }
        const u1 = heap[idx++] & 63;
        if ((u0 & 224) == 192) {
          str += String.fromCharCode((u0 & 31) << 6 | u1);
          continue;
        }
        const u2 = heap[idx++] & 63;
        if ((u0 & 240) == 224) {
          u0 = (u0 & 15) << 12 | u1 << 6 | u2;
        } else {
          u0 = (u0 & 7) << 18 | u1 << 12 | u2 << 6 | heap[idx++] & 63;
        }
        if (u0 < 65536) {
          str += String.fromCharCode(u0);
        } else {
          const ch = u0 - 65536;
          str += String.fromCharCode(55296 | ch >> 10, 56320 | ch & 1023);
        }
      }
    }
    return str;
  };
  const UTF8ToString = function(ptr, maxBytesToRead) {
    return ptr ? UTF8ArrayToString(module['HEAPU8'], ptr, maxBytesToRead) : '';
  };
  const writeArrayToMemory = function(array, buffer) {
    module['HEAPU8'].set(array, buffer);
  };
  const toC = {
    'string': function(str) {
      let ret = 0;
      if (str !== null && str !== undefined && str !== 0) {
        const len = (str.length << 2) + 1;
        ret = module['stackAlloc'](len);
        stringToUTF8(str, ret, len);
      }
      return ret;
    },
    'array': function(arr) {
      const ret = module['stackAlloc'](arr.length);
      writeArrayToMemory(arr, ret);
      return ret;
    },
  };

  const convertReturnValue = function(ret) {
    if (returnType === 'string') {
      const result = UTF8ToString(ret);
      module['_cfdjsFreeString'](ret);
      return result;
    }
    if (returnType === 'boolean') return Boolean(ret);
    return ret;
  };
  // const func = getCFunc(ident);
  const cArgs = [];
  let stack = 0;
  if (args) {
    for (let i = 0; i < args.length; i++) {
      const converter = toC[argTypes[i]];
      if (converter) {
        if (stack === 0) stack = module['stackSave']();
        cArgs[i] = converter(args[i]);
      } else {
        cArgs[i] = args[i];
      }
    }
  }

  // eslint-disable-next-line prefer-spread
  let ret = func.apply(null, cArgs);
  ret = convertReturnValue(ret);
  if (stack !== 0) module['stackRestore'](stack);
  return ret;
};

const callJsonApi = async function(wasmModule, reqName, arg) {
  let retObj;
  try {
    // stringify all arguments
    let argStr = '';
    if (arg) {
      argStr = JSON.stringify(arg, (key, value) =>
            typeof value === 'bigint' ? value.toString() : value);
    }

    const retJson = await ccallCfd(wasmModule, wasmModule['_cfdjsJsonApi'],
        'string', ['string', 'string'], [reqName, argStr]);
    retObj = JSON.parse(retJson);
  } catch (err) {
    console.log(err);
    throw new Error('ERROR: Invalid function call:' +
      ` func=[${reqName}], args=[${args}]`);
  }

  if (retObj.hasOwnProperty('error')) {
    throw new Error(JSON.stringify(retObj.error));
  }
  return retObj;
};

const PLATFORM_IS_NODE = typeof process === 'object' &&
    typeof process.versions === 'object' &&
    typeof process.versions.node === 'string';
if (PLATFORM_IS_NODE) {
  if (typeof module !== 'undefined') {
    module['exports'] = {
      callJsonApi: callJsonApi,
      ccallCfd: ccallCfd,
    };
  }
}