pdfjs-dist/lib/core/cmap.js

/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';
var sharedUtil = require('../shared/util.js');
var corePrimitives = require('./primitives.js');
var coreStream = require('./stream.js');
var coreParser = require('./parser.js');
var Util = sharedUtil.Util;
var assert = sharedUtil.assert;
var warn = sharedUtil.warn;
var error = sharedUtil.error;
var isInt = sharedUtil.isInt;
var isString = sharedUtil.isString;
var MissingDataException = sharedUtil.MissingDataException;
var CMapCompressionType = sharedUtil.CMapCompressionType;
var isEOF = corePrimitives.isEOF;
var isName = corePrimitives.isName;
var isCmd = corePrimitives.isCmd;
var isStream = corePrimitives.isStream;
var Stream = coreStream.Stream;
var Lexer = coreParser.Lexer;
var BUILT_IN_CMAPS = [
 'Adobe-GB1-UCS2',
 'Adobe-CNS1-UCS2',
 'Adobe-Japan1-UCS2',
 'Adobe-Korea1-UCS2',
 '78-EUC-H',
 '78-EUC-V',
 '78-H',
 '78-RKSJ-H',
 '78-RKSJ-V',
 '78-V',
 '78ms-RKSJ-H',
 '78ms-RKSJ-V',
 '83pv-RKSJ-H',
 '90ms-RKSJ-H',
 '90ms-RKSJ-V',
 '90msp-RKSJ-H',
 '90msp-RKSJ-V',
 '90pv-RKSJ-H',
 '90pv-RKSJ-V',
 'Add-H',
 'Add-RKSJ-H',
 'Add-RKSJ-V',
 'Add-V',
 'Adobe-CNS1-0',
 'Adobe-CNS1-1',
 'Adobe-CNS1-2',
 'Adobe-CNS1-3',
 'Adobe-CNS1-4',
 'Adobe-CNS1-5',
 'Adobe-CNS1-6',
 'Adobe-GB1-0',
 'Adobe-GB1-1',
 'Adobe-GB1-2',
 'Adobe-GB1-3',
 'Adobe-GB1-4',
 'Adobe-GB1-5',
 'Adobe-Japan1-0',
 'Adobe-Japan1-1',
 'Adobe-Japan1-2',
 'Adobe-Japan1-3',
 'Adobe-Japan1-4',
 'Adobe-Japan1-5',
 'Adobe-Japan1-6',
 'Adobe-Korea1-0',
 'Adobe-Korea1-1',
 'Adobe-Korea1-2',
 'B5-H',
 'B5-V',
 'B5pc-H',
 'B5pc-V',
 'CNS-EUC-H',
 'CNS-EUC-V',
 'CNS1-H',
 'CNS1-V',
 'CNS2-H',
 'CNS2-V',
 'ETHK-B5-H',
 'ETHK-B5-V',
 'ETen-B5-H',
 'ETen-B5-V',
 'ETenms-B5-H',
 'ETenms-B5-V',
 'EUC-H',
 'EUC-V',
 'Ext-H',
 'Ext-RKSJ-H',
 'Ext-RKSJ-V',
 'Ext-V',
 'GB-EUC-H',
 'GB-EUC-V',
 'GB-H',
 'GB-V',
 'GBK-EUC-H',
 'GBK-EUC-V',
 'GBK2K-H',
 'GBK2K-V',
 'GBKp-EUC-H',
 'GBKp-EUC-V',
 'GBT-EUC-H',
 'GBT-EUC-V',
 'GBT-H',
 'GBT-V',
 'GBTpc-EUC-H',
 'GBTpc-EUC-V',
 'GBpc-EUC-H',
 'GBpc-EUC-V',
 'H',
 'HKdla-B5-H',
 'HKdla-B5-V',
 'HKdlb-B5-H',
 'HKdlb-B5-V',
 'HKgccs-B5-H',
 'HKgccs-B5-V',
 'HKm314-B5-H',
 'HKm314-B5-V',
 'HKm471-B5-H',
 'HKm471-B5-V',
 'HKscs-B5-H',
 'HKscs-B5-V',
 'Hankaku',
 'Hiragana',
 'KSC-EUC-H',
 'KSC-EUC-V',
 'KSC-H',
 'KSC-Johab-H',
 'KSC-Johab-V',
 'KSC-V',
 'KSCms-UHC-H',
 'KSCms-UHC-HW-H',
 'KSCms-UHC-HW-V',
 'KSCms-UHC-V',
 'KSCpc-EUC-H',
 'KSCpc-EUC-V',
 'Katakana',
 'NWP-H',
 'NWP-V',
 'RKSJ-H',
 'RKSJ-V',
 'Roman',
 'UniCNS-UCS2-H',
 'UniCNS-UCS2-V',
 'UniCNS-UTF16-H',
 'UniCNS-UTF16-V',
 'UniCNS-UTF32-H',
 'UniCNS-UTF32-V',
 'UniCNS-UTF8-H',
 'UniCNS-UTF8-V',
 'UniGB-UCS2-H',
 'UniGB-UCS2-V',
 'UniGB-UTF16-H',
 'UniGB-UTF16-V',
 'UniGB-UTF32-H',
 'UniGB-UTF32-V',
 'UniGB-UTF8-H',
 'UniGB-UTF8-V',
 'UniJIS-UCS2-H',
 'UniJIS-UCS2-HW-H',
 'UniJIS-UCS2-HW-V',
 'UniJIS-UCS2-V',
 'UniJIS-UTF16-H',
 'UniJIS-UTF16-V',
 'UniJIS-UTF32-H',
 'UniJIS-UTF32-V',
 'UniJIS-UTF8-H',
 'UniJIS-UTF8-V',
 'UniJIS2004-UTF16-H',
 'UniJIS2004-UTF16-V',
 'UniJIS2004-UTF32-H',
 'UniJIS2004-UTF32-V',
 'UniJIS2004-UTF8-H',
 'UniJIS2004-UTF8-V',
 'UniJISPro-UCS2-HW-V',
 'UniJISPro-UCS2-V',
 'UniJISPro-UTF8-V',
 'UniJISX0213-UTF32-H',
 'UniJISX0213-UTF32-V',
 'UniJISX02132004-UTF32-H',
 'UniJISX02132004-UTF32-V',
 'UniKS-UCS2-H',
 'UniKS-UCS2-V',
 'UniKS-UTF16-H',
 'UniKS-UTF16-V',
 'UniKS-UTF32-H',
 'UniKS-UTF32-V',
 'UniKS-UTF8-H',
 'UniKS-UTF8-V',
 'V',
 'WP-Symbol'
];
var CMap = function CMapClosure() {
 function CMap(builtInCMap) {
  this.codespaceRanges = [
   [],
   [],
   [],
   []
  ];
  this.numCodespaceRanges = 0;
  this._map = [];
  this.name = '';
  this.vertical = false;
  this.useCMap = null;
  this.builtInCMap = builtInCMap;
 }
 CMap.prototype = {
  addCodespaceRange: function (n, low, high) {
   this.codespaceRanges[n - 1].push(low, high);
   this.numCodespaceRanges++;
  },
  mapCidRange: function (low, high, dstLow) {
   while (low <= high) {
    this._map[low++] = dstLow++;
   }
  },
  mapBfRange: function (low, high, dstLow) {
   var lastByte = dstLow.length - 1;
   while (low <= high) {
    this._map[low++] = dstLow;
    dstLow = dstLow.substr(0, lastByte) + String.fromCharCode(dstLow.charCodeAt(lastByte) + 1);
   }
  },
  mapBfRangeToArray: function (low, high, array) {
   var i = 0, ii = array.length;
   while (low <= high && i < ii) {
    this._map[low] = array[i++];
    ++low;
   }
  },
  mapOne: function (src, dst) {
   this._map[src] = dst;
  },
  lookup: function (code) {
   return this._map[code];
  },
  contains: function (code) {
   return this._map[code] !== undefined;
  },
  forEach: function (callback) {
   var map = this._map;
   var length = map.length;
   var i;
   if (length <= 0x10000) {
    for (i = 0; i < length; i++) {
     if (map[i] !== undefined) {
      callback(i, map[i]);
     }
    }
   } else {
    for (i in this._map) {
     callback(i, map[i]);
    }
   }
  },
  charCodeOf: function (value) {
   return this._map.indexOf(value);
  },
  getMap: function () {
   return this._map;
  },
  readCharCode: function (str, offset, out) {
   var c = 0;
   var codespaceRanges = this.codespaceRanges;
   var codespaceRangesLen = this.codespaceRanges.length;
   for (var n = 0; n < codespaceRangesLen; n++) {
    c = (c << 8 | str.charCodeAt(offset + n)) >>> 0;
    var codespaceRange = codespaceRanges[n];
    for (var k = 0, kk = codespaceRange.length; k < kk;) {
     var low = codespaceRange[k++];
     var high = codespaceRange[k++];
     if (c >= low && c <= high) {
      out.charcode = c;
      out.length = n + 1;
      return;
     }
    }
   }
   out.charcode = 0;
   out.length = 1;
  },
  get length() {
   return this._map.length;
  },
  get isIdentityCMap() {
   if (!(this.name === 'Identity-H' || this.name === 'Identity-V')) {
    return false;
   }
   if (this._map.length !== 0x10000) {
    return false;
   }
   for (var i = 0; i < 0x10000; i++) {
    if (this._map[i] !== i) {
     return false;
    }
   }
   return true;
  }
 };
 return CMap;
}();
var IdentityCMap = function IdentityCMapClosure() {
 function IdentityCMap(vertical, n) {
  CMap.call(this);
  this.vertical = vertical;
  this.addCodespaceRange(n, 0, 0xffff);
 }
 Util.inherit(IdentityCMap, CMap, {});
 IdentityCMap.prototype = {
  addCodespaceRange: CMap.prototype.addCodespaceRange,
  mapCidRange: function (low, high, dstLow) {
   error('should not call mapCidRange');
  },
  mapBfRange: function (low, high, dstLow) {
   error('should not call mapBfRange');
  },
  mapBfRangeToArray: function (low, high, array) {
   error('should not call mapBfRangeToArray');
  },
  mapOne: function (src, dst) {
   error('should not call mapCidOne');
  },
  lookup: function (code) {
   return isInt(code) && code <= 0xffff ? code : undefined;
  },
  contains: function (code) {
   return isInt(code) && code <= 0xffff;
  },
  forEach: function (callback) {
   for (var i = 0; i <= 0xffff; i++) {
    callback(i, i);
   }
  },
  charCodeOf: function (value) {
   return isInt(value) && value <= 0xffff ? value : -1;
  },
  getMap: function () {
   var map = new Array(0x10000);
   for (var i = 0; i <= 0xffff; i++) {
    map[i] = i;
   }
   return map;
  },
  readCharCode: CMap.prototype.readCharCode,
  get length() {
   return 0x10000;
  },
  get isIdentityCMap() {
   error('should not access .isIdentityCMap');
  }
 };
 return IdentityCMap;
}();
var BinaryCMapReader = function BinaryCMapReaderClosure() {
 function hexToInt(a, size) {
  var n = 0;
  for (var i = 0; i <= size; i++) {
   n = n << 8 | a[i];
  }
  return n >>> 0;
 }
 function hexToStr(a, size) {
  if (size === 1) {
   return String.fromCharCode(a[0], a[1]);
  }
  if (size === 3) {
   return String.fromCharCode(a[0], a[1], a[2], a[3]);
  }
  return String.fromCharCode.apply(null, a.subarray(0, size + 1));
 }
 function addHex(a, b, size) {
  var c = 0;
  for (var i = size; i >= 0; i--) {
   c += a[i] + b[i];
   a[i] = c & 255;
   c >>= 8;
  }
 }
 function incHex(a, size) {
  var c = 1;
  for (var i = size; i >= 0 && c > 0; i--) {
   c += a[i];
   a[i] = c & 255;
   c >>= 8;
  }
 }
 var MAX_NUM_SIZE = 16;
 var MAX_ENCODED_NUM_SIZE = 19;
 function BinaryCMapStream(data) {
  this.buffer = data;
  this.pos = 0;
  this.end = data.length;
  this.tmpBuf = new Uint8Array(MAX_ENCODED_NUM_SIZE);
 }
 BinaryCMapStream.prototype = {
  readByte: function () {
   if (this.pos >= this.end) {
    return -1;
   }
   return this.buffer[this.pos++];
  },
  readNumber: function () {
   var n = 0;
   var last;
   do {
    var b = this.readByte();
    if (b < 0) {
     error('unexpected EOF in bcmap');
    }
    last = !(b & 0x80);
    n = n << 7 | b & 0x7F;
   } while (!last);
   return n;
  },
  readSigned: function () {
   var n = this.readNumber();
   return n & 1 ? ~(n >>> 1) : n >>> 1;
  },
  readHex: function (num, size) {
   num.set(this.buffer.subarray(this.pos, this.pos + size + 1));
   this.pos += size + 1;
  },
  readHexNumber: function (num, size) {
   var last;
   var stack = this.tmpBuf, sp = 0;
   do {
    var b = this.readByte();
    if (b < 0) {
     error('unexpected EOF in bcmap');
    }
    last = !(b & 0x80);
    stack[sp++] = b & 0x7F;
   } while (!last);
   var i = size, buffer = 0, bufferSize = 0;
   while (i >= 0) {
    while (bufferSize < 8 && stack.length > 0) {
     buffer = stack[--sp] << bufferSize | buffer;
     bufferSize += 7;
    }
    num[i] = buffer & 255;
    i--;
    buffer >>= 8;
    bufferSize -= 8;
   }
  },
  readHexSigned: function (num, size) {
   this.readHexNumber(num, size);
   var sign = num[size] & 1 ? 255 : 0;
   var c = 0;
   for (var i = 0; i <= size; i++) {
    c = (c & 1) << 8 | num[i];
    num[i] = c >> 1 ^ sign;
   }
  },
  readString: function () {
   var len = this.readNumber();
   var s = '';
   for (var i = 0; i < len; i++) {
    s += String.fromCharCode(this.readNumber());
   }
   return s;
  }
 };
 function processBinaryCMap(data, cMap, extend) {
  return new Promise(function (resolve, reject) {
   var stream = new BinaryCMapStream(data);
   var header = stream.readByte();
   cMap.vertical = !!(header & 1);
   var useCMap = null;
   var start = new Uint8Array(MAX_NUM_SIZE);
   var end = new Uint8Array(MAX_NUM_SIZE);
   var char = new Uint8Array(MAX_NUM_SIZE);
   var charCode = new Uint8Array(MAX_NUM_SIZE);
   var tmp = new Uint8Array(MAX_NUM_SIZE);
   var code;
   var b;
   while ((b = stream.readByte()) >= 0) {
    var type = b >> 5;
    if (type === 7) {
     switch (b & 0x1F) {
     case 0:
      stream.readString();
      break;
     case 1:
      useCMap = stream.readString();
      break;
     }
     continue;
    }
    var sequence = !!(b & 0x10);
    var dataSize = b & 15;
    assert(dataSize + 1 <= MAX_NUM_SIZE);
    var ucs2DataSize = 1;
    var subitemsCount = stream.readNumber();
    var i;
    switch (type) {
    case 0:
     stream.readHex(start, dataSize);
     stream.readHexNumber(end, dataSize);
     addHex(end, start, dataSize);
     cMap.addCodespaceRange(dataSize + 1, hexToInt(start, dataSize), hexToInt(end, dataSize));
     for (i = 1; i < subitemsCount; i++) {
      incHex(end, dataSize);
      stream.readHexNumber(start, dataSize);
      addHex(start, end, dataSize);
      stream.readHexNumber(end, dataSize);
      addHex(end, start, dataSize);
      cMap.addCodespaceRange(dataSize + 1, hexToInt(start, dataSize), hexToInt(end, dataSize));
     }
     break;
    case 1:
     stream.readHex(start, dataSize);
     stream.readHexNumber(end, dataSize);
     addHex(end, start, dataSize);
     code = stream.readNumber();
     for (i = 1; i < subitemsCount; i++) {
      incHex(end, dataSize);
      stream.readHexNumber(start, dataSize);
      addHex(start, end, dataSize);
      stream.readHexNumber(end, dataSize);
      addHex(end, start, dataSize);
      code = stream.readNumber();
     }
     break;
    case 2:
     stream.readHex(char, dataSize);
     code = stream.readNumber();
     cMap.mapOne(hexToInt(char, dataSize), code);
     for (i = 1; i < subitemsCount; i++) {
      incHex(char, dataSize);
      if (!sequence) {
       stream.readHexNumber(tmp, dataSize);
       addHex(char, tmp, dataSize);
      }
      code = stream.readSigned() + (code + 1);
      cMap.mapOne(hexToInt(char, dataSize), code);
     }
     break;
    case 3:
     stream.readHex(start, dataSize);
     stream.readHexNumber(end, dataSize);
     addHex(end, start, dataSize);
     code = stream.readNumber();
     cMap.mapCidRange(hexToInt(start, dataSize), hexToInt(end, dataSize), code);
     for (i = 1; i < subitemsCount; i++) {
      incHex(end, dataSize);
      if (!sequence) {
       stream.readHexNumber(start, dataSize);
       addHex(start, end, dataSize);
      } else {
       start.set(end);
      }
      stream.readHexNumber(end, dataSize);
      addHex(end, start, dataSize);
      code = stream.readNumber();
      cMap.mapCidRange(hexToInt(start, dataSize), hexToInt(end, dataSize), code);
     }
     break;
    case 4:
     stream.readHex(char, ucs2DataSize);
     stream.readHex(charCode, dataSize);
     cMap.mapOne(hexToInt(char, ucs2DataSize), hexToStr(charCode, dataSize));
     for (i = 1; i < subitemsCount; i++) {
      incHex(char, ucs2DataSize);
      if (!sequence) {
       stream.readHexNumber(tmp, ucs2DataSize);
       addHex(char, tmp, ucs2DataSize);
      }
      incHex(charCode, dataSize);
      stream.readHexSigned(tmp, dataSize);
      addHex(charCode, tmp, dataSize);
      cMap.mapOne(hexToInt(char, ucs2DataSize), hexToStr(charCode, dataSize));
     }
     break;
    case 5:
     stream.readHex(start, ucs2DataSize);
     stream.readHexNumber(end, ucs2DataSize);
     addHex(end, start, ucs2DataSize);
     stream.readHex(charCode, dataSize);
     cMap.mapBfRange(hexToInt(start, ucs2DataSize), hexToInt(end, ucs2DataSize), hexToStr(charCode, dataSize));
     for (i = 1; i < subitemsCount; i++) {
      incHex(end, ucs2DataSize);
      if (!sequence) {
       stream.readHexNumber(start, ucs2DataSize);
       addHex(start, end, ucs2DataSize);
      } else {
       start.set(end);
      }
      stream.readHexNumber(end, ucs2DataSize);
      addHex(end, start, ucs2DataSize);
      stream.readHex(charCode, dataSize);
      cMap.mapBfRange(hexToInt(start, ucs2DataSize), hexToInt(end, ucs2DataSize), hexToStr(charCode, dataSize));
     }
     break;
    default:
     reject(new Error('processBinaryCMap: Unknown type: ' + type));
     return;
    }
   }
   if (useCMap) {
    resolve(extend(useCMap));
    return;
   }
   resolve(cMap);
  });
 }
 function BinaryCMapReader() {
 }
 BinaryCMapReader.prototype = { process: processBinaryCMap };
 return BinaryCMapReader;
}();
var CMapFactory = function CMapFactoryClosure() {
 function strToInt(str) {
  var a = 0;
  for (var i = 0; i < str.length; i++) {
   a = a << 8 | str.charCodeAt(i);
  }
  return a >>> 0;
 }
 function expectString(obj) {
  if (!isString(obj)) {
   error('Malformed CMap: expected string.');
  }
 }
 function expectInt(obj) {
  if (!isInt(obj)) {
   error('Malformed CMap: expected int.');
  }
 }
 function parseBfChar(cMap, lexer) {
  while (true) {
   var obj = lexer.getObj();
   if (isEOF(obj)) {
    break;
   }
   if (isCmd(obj, 'endbfchar')) {
    return;
   }
   expectString(obj);
   var src = strToInt(obj);
   obj = lexer.getObj();
   expectString(obj);
   var dst = obj;
   cMap.mapOne(src, dst);
  }
 }
 function parseBfRange(cMap, lexer) {
  while (true) {
   var obj = lexer.getObj();
   if (isEOF(obj)) {
    break;
   }
   if (isCmd(obj, 'endbfrange')) {
    return;
   }
   expectString(obj);
   var low = strToInt(obj);
   obj = lexer.getObj();
   expectString(obj);
   var high = strToInt(obj);
   obj = lexer.getObj();
   if (isInt(obj) || isString(obj)) {
    var dstLow = isInt(obj) ? String.fromCharCode(obj) : obj;
    cMap.mapBfRange(low, high, dstLow);
   } else if (isCmd(obj, '[')) {
    obj = lexer.getObj();
    var array = [];
    while (!isCmd(obj, ']') && !isEOF(obj)) {
     array.push(obj);
     obj = lexer.getObj();
    }
    cMap.mapBfRangeToArray(low, high, array);
   } else {
    break;
   }
  }
  error('Invalid bf range.');
 }
 function parseCidChar(cMap, lexer) {
  while (true) {
   var obj = lexer.getObj();
   if (isEOF(obj)) {
    break;
   }
   if (isCmd(obj, 'endcidchar')) {
    return;
   }
   expectString(obj);
   var src = strToInt(obj);
   obj = lexer.getObj();
   expectInt(obj);
   var dst = obj;
   cMap.mapOne(src, dst);
  }
 }
 function parseCidRange(cMap, lexer) {
  while (true) {
   var obj = lexer.getObj();
   if (isEOF(obj)) {
    break;
   }
   if (isCmd(obj, 'endcidrange')) {
    return;
   }
   expectString(obj);
   var low = strToInt(obj);
   obj = lexer.getObj();
   expectString(obj);
   var high = strToInt(obj);
   obj = lexer.getObj();
   expectInt(obj);
   var dstLow = obj;
   cMap.mapCidRange(low, high, dstLow);
  }
 }
 function parseCodespaceRange(cMap, lexer) {
  while (true) {
   var obj = lexer.getObj();
   if (isEOF(obj)) {
    break;
   }
   if (isCmd(obj, 'endcodespacerange')) {
    return;
   }
   if (!isString(obj)) {
    break;
   }
   var low = strToInt(obj);
   obj = lexer.getObj();
   if (!isString(obj)) {
    break;
   }
   var high = strToInt(obj);
   cMap.addCodespaceRange(obj.length, low, high);
  }
  error('Invalid codespace range.');
 }
 function parseWMode(cMap, lexer) {
  var obj = lexer.getObj();
  if (isInt(obj)) {
   cMap.vertical = !!obj;
  }
 }
 function parseCMapName(cMap, lexer) {
  var obj = lexer.getObj();
  if (isName(obj) && isString(obj.name)) {
   cMap.name = obj.name;
  }
 }
 function parseCMap(cMap, lexer, fetchBuiltInCMap, useCMap) {
  var previous;
  var embededUseCMap;
  objLoop:
   while (true) {
    try {
     var obj = lexer.getObj();
     if (isEOF(obj)) {
      break;
     } else if (isName(obj)) {
      if (obj.name === 'WMode') {
       parseWMode(cMap, lexer);
      } else if (obj.name === 'CMapName') {
       parseCMapName(cMap, lexer);
      }
      previous = obj;
     } else if (isCmd(obj)) {
      switch (obj.cmd) {
      case 'endcmap':
       break objLoop;
      case 'usecmap':
       if (isName(previous)) {
        embededUseCMap = previous.name;
       }
       break;
      case 'begincodespacerange':
       parseCodespaceRange(cMap, lexer);
       break;
      case 'beginbfchar':
       parseBfChar(cMap, lexer);
       break;
      case 'begincidchar':
       parseCidChar(cMap, lexer);
       break;
      case 'beginbfrange':
       parseBfRange(cMap, lexer);
       break;
      case 'begincidrange':
       parseCidRange(cMap, lexer);
       break;
      }
     }
    } catch (ex) {
     if (ex instanceof MissingDataException) {
      throw ex;
     }
     warn('Invalid cMap data: ' + ex);
     continue;
    }
   }
  if (!useCMap && embededUseCMap) {
   useCMap = embededUseCMap;
  }
  if (useCMap) {
   return extendCMap(cMap, fetchBuiltInCMap, useCMap);
  }
  return Promise.resolve(cMap);
 }
 function extendCMap(cMap, fetchBuiltInCMap, useCMap) {
  return createBuiltInCMap(useCMap, fetchBuiltInCMap).then(function (newCMap) {
   cMap.useCMap = newCMap;
   if (cMap.numCodespaceRanges === 0) {
    var useCodespaceRanges = cMap.useCMap.codespaceRanges;
    for (var i = 0; i < useCodespaceRanges.length; i++) {
     cMap.codespaceRanges[i] = useCodespaceRanges[i].slice();
    }
    cMap.numCodespaceRanges = cMap.useCMap.numCodespaceRanges;
   }
   cMap.useCMap.forEach(function (key, value) {
    if (!cMap.contains(key)) {
     cMap.mapOne(key, cMap.useCMap.lookup(key));
    }
   });
   return cMap;
  });
 }
 function createBuiltInCMap(name, fetchBuiltInCMap) {
  if (name === 'Identity-H') {
   return Promise.resolve(new IdentityCMap(false, 2));
  } else if (name === 'Identity-V') {
   return Promise.resolve(new IdentityCMap(true, 2));
  }
  if (BUILT_IN_CMAPS.indexOf(name) === -1) {
   return Promise.reject(new Error('Unknown cMap name: ' + name));
  }
  assert(fetchBuiltInCMap, 'Built-in CMap parameters are not provided.');
  return fetchBuiltInCMap(name).then(function (data) {
   var cMapData = data.cMapData, compressionType = data.compressionType;
   var cMap = new CMap(true);
   if (compressionType === CMapCompressionType.BINARY) {
    return new BinaryCMapReader().process(cMapData, cMap, function (useCMap) {
     return extendCMap(cMap, fetchBuiltInCMap, useCMap);
    });
   }
   assert(compressionType === CMapCompressionType.NONE, 'TODO: Only BINARY/NONE CMap compression is currently supported.');
   var lexer = new Lexer(new Stream(cMapData));
   return parseCMap(cMap, lexer, fetchBuiltInCMap, null);
  });
 }
 return {
  create: function (params) {
   var encoding = params.encoding;
   var fetchBuiltInCMap = params.fetchBuiltInCMap;
   var useCMap = params.useCMap;
   if (isName(encoding)) {
    return createBuiltInCMap(encoding.name, fetchBuiltInCMap);
   } else if (isStream(encoding)) {
    var cMap = new CMap();
    var lexer = new Lexer(encoding);
    return parseCMap(cMap, lexer, fetchBuiltInCMap, useCMap).then(function (parsedCMap) {
     if (parsedCMap.isIdentityCMap) {
      return createBuiltInCMap(parsedCMap.name, fetchBuiltInCMap);
     }
     return parsedCMap;
    });
   }
   return Promise.reject(new Error('Encoding required.'));
  }
 };
}();
exports.CMap = CMap;
exports.CMapFactory = CMapFactory;
exports.IdentityCMap = IdentityCMap;