pdfjs-dist/lib/core/stream.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 coreJbig2 = require('./jbig2.js');
var coreJpg = require('./jpg.js');
var coreJpx = require('./jpx.js');
var Util = sharedUtil.Util;
var error = sharedUtil.error;
var info = sharedUtil.info;
var isInt = sharedUtil.isInt;
var isArray = sharedUtil.isArray;
var createObjectURL = sharedUtil.createObjectURL;
var shadow = sharedUtil.shadow;
var isSpace = sharedUtil.isSpace;
var Dict = corePrimitives.Dict;
var isDict = corePrimitives.isDict;
var isStream = corePrimitives.isStream;
var Jbig2Image = coreJbig2.Jbig2Image;
var JpegImage = coreJpg.JpegImage;
var JpxImage = coreJpx.JpxImage;
var Stream = function StreamClosure() {
 function Stream(arrayBuffer, start, length, dict) {
  this.bytes = arrayBuffer instanceof Uint8Array ? arrayBuffer : new Uint8Array(arrayBuffer);
  this.start = start || 0;
  this.pos = this.start;
  this.end = start + length || this.bytes.length;
  this.dict = dict;
 }
 Stream.prototype = {
  get length() {
   return this.end - this.start;
  },
  get isEmpty() {
   return this.length === 0;
  },
  getByte: function Stream_getByte() {
   if (this.pos >= this.end) {
    return -1;
   }
   return this.bytes[this.pos++];
  },
  getUint16: function Stream_getUint16() {
   var b0 = this.getByte();
   var b1 = this.getByte();
   if (b0 === -1 || b1 === -1) {
    return -1;
   }
   return (b0 << 8) + b1;
  },
  getInt32: function Stream_getInt32() {
   var b0 = this.getByte();
   var b1 = this.getByte();
   var b2 = this.getByte();
   var b3 = this.getByte();
   return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
  },
  getBytes: function Stream_getBytes(length) {
   var bytes = this.bytes;
   var pos = this.pos;
   var strEnd = this.end;
   if (!length) {
    return bytes.subarray(pos, strEnd);
   }
   var end = pos + length;
   if (end > strEnd) {
    end = strEnd;
   }
   this.pos = end;
   return bytes.subarray(pos, end);
  },
  peekByte: function Stream_peekByte() {
   var peekedByte = this.getByte();
   this.pos--;
   return peekedByte;
  },
  peekBytes: function Stream_peekBytes(length) {
   var bytes = this.getBytes(length);
   this.pos -= bytes.length;
   return bytes;
  },
  skip: function Stream_skip(n) {
   if (!n) {
    n = 1;
   }
   this.pos += n;
  },
  reset: function Stream_reset() {
   this.pos = this.start;
  },
  moveStart: function Stream_moveStart() {
   this.start = this.pos;
  },
  makeSubStream: function Stream_makeSubStream(start, length, dict) {
   return new Stream(this.bytes.buffer, start, length, dict);
  }
 };
 return Stream;
}();
var StringStream = function StringStreamClosure() {
 function StringStream(str) {
  var length = str.length;
  var bytes = new Uint8Array(length);
  for (var n = 0; n < length; ++n) {
   bytes[n] = str.charCodeAt(n);
  }
  Stream.call(this, bytes);
 }
 StringStream.prototype = Stream.prototype;
 return StringStream;
}();
var DecodeStream = function DecodeStreamClosure() {
 var emptyBuffer = new Uint8Array(0);
 function DecodeStream(maybeMinBufferLength) {
  this.pos = 0;
  this.bufferLength = 0;
  this.eof = false;
  this.buffer = emptyBuffer;
  this.minBufferLength = 512;
  if (maybeMinBufferLength) {
   while (this.minBufferLength < maybeMinBufferLength) {
    this.minBufferLength *= 2;
   }
  }
 }
 DecodeStream.prototype = {
  get isEmpty() {
   while (!this.eof && this.bufferLength === 0) {
    this.readBlock();
   }
   return this.bufferLength === 0;
  },
  ensureBuffer: function DecodeStream_ensureBuffer(requested) {
   var buffer = this.buffer;
   if (requested <= buffer.byteLength) {
    return buffer;
   }
   var size = this.minBufferLength;
   while (size < requested) {
    size *= 2;
   }
   var buffer2 = new Uint8Array(size);
   buffer2.set(buffer);
   return this.buffer = buffer2;
  },
  getByte: function DecodeStream_getByte() {
   var pos = this.pos;
   while (this.bufferLength <= pos) {
    if (this.eof) {
     return -1;
    }
    this.readBlock();
   }
   return this.buffer[this.pos++];
  },
  getUint16: function DecodeStream_getUint16() {
   var b0 = this.getByte();
   var b1 = this.getByte();
   if (b0 === -1 || b1 === -1) {
    return -1;
   }
   return (b0 << 8) + b1;
  },
  getInt32: function DecodeStream_getInt32() {
   var b0 = this.getByte();
   var b1 = this.getByte();
   var b2 = this.getByte();
   var b3 = this.getByte();
   return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
  },
  getBytes: function DecodeStream_getBytes(length) {
   var end, pos = this.pos;
   if (length) {
    this.ensureBuffer(pos + length);
    end = pos + length;
    while (!this.eof && this.bufferLength < end) {
     this.readBlock();
    }
    var bufEnd = this.bufferLength;
    if (end > bufEnd) {
     end = bufEnd;
    }
   } else {
    while (!this.eof) {
     this.readBlock();
    }
    end = this.bufferLength;
   }
   this.pos = end;
   return this.buffer.subarray(pos, end);
  },
  peekByte: function DecodeStream_peekByte() {
   var peekedByte = this.getByte();
   this.pos--;
   return peekedByte;
  },
  peekBytes: function DecodeStream_peekBytes(length) {
   var bytes = this.getBytes(length);
   this.pos -= bytes.length;
   return bytes;
  },
  makeSubStream: function DecodeStream_makeSubStream(start, length, dict) {
   var end = start + length;
   while (this.bufferLength <= end && !this.eof) {
    this.readBlock();
   }
   return new Stream(this.buffer, start, length, dict);
  },
  skip: function DecodeStream_skip(n) {
   if (!n) {
    n = 1;
   }
   this.pos += n;
  },
  reset: function DecodeStream_reset() {
   this.pos = 0;
  },
  getBaseStreams: function DecodeStream_getBaseStreams() {
   if (this.str && this.str.getBaseStreams) {
    return this.str.getBaseStreams();
   }
   return [];
  }
 };
 return DecodeStream;
}();
var StreamsSequenceStream = function StreamsSequenceStreamClosure() {
 function StreamsSequenceStream(streams) {
  this.streams = streams;
  DecodeStream.call(this, null);
 }
 StreamsSequenceStream.prototype = Object.create(DecodeStream.prototype);
 StreamsSequenceStream.prototype.readBlock = function streamSequenceStreamReadBlock() {
  var streams = this.streams;
  if (streams.length === 0) {
   this.eof = true;
   return;
  }
  var stream = streams.shift();
  var chunk = stream.getBytes();
  var bufferLength = this.bufferLength;
  var newLength = bufferLength + chunk.length;
  var buffer = this.ensureBuffer(newLength);
  buffer.set(chunk, bufferLength);
  this.bufferLength = newLength;
 };
 StreamsSequenceStream.prototype.getBaseStreams = function StreamsSequenceStream_getBaseStreams() {
  var baseStreams = [];
  for (var i = 0, ii = this.streams.length; i < ii; i++) {
   var stream = this.streams[i];
   if (stream.getBaseStreams) {
    Util.appendToArray(baseStreams, stream.getBaseStreams());
   }
  }
  return baseStreams;
 };
 return StreamsSequenceStream;
}();
var FlateStream = function FlateStreamClosure() {
 var codeLenCodeMap = new Int32Array([
  16,
  17,
  18,
  0,
  8,
  7,
  9,
  6,
  10,
  5,
  11,
  4,
  12,
  3,
  13,
  2,
  14,
  1,
  15
 ]);
 var lengthDecode = new Int32Array([
  0x00003,
  0x00004,
  0x00005,
  0x00006,
  0x00007,
  0x00008,
  0x00009,
  0x0000a,
  0x1000b,
  0x1000d,
  0x1000f,
  0x10011,
  0x20013,
  0x20017,
  0x2001b,
  0x2001f,
  0x30023,
  0x3002b,
  0x30033,
  0x3003b,
  0x40043,
  0x40053,
  0x40063,
  0x40073,
  0x50083,
  0x500a3,
  0x500c3,
  0x500e3,
  0x00102,
  0x00102,
  0x00102
 ]);
 var distDecode = new Int32Array([
  0x00001,
  0x00002,
  0x00003,
  0x00004,
  0x10005,
  0x10007,
  0x20009,
  0x2000d,
  0x30011,
  0x30019,
  0x40021,
  0x40031,
  0x50041,
  0x50061,
  0x60081,
  0x600c1,
  0x70101,
  0x70181,
  0x80201,
  0x80301,
  0x90401,
  0x90601,
  0xa0801,
  0xa0c01,
  0xb1001,
  0xb1801,
  0xc2001,
  0xc3001,
  0xd4001,
  0xd6001
 ]);
 var fixedLitCodeTab = [
  new Int32Array([
   0x70100,
   0x80050,
   0x80010,
   0x80118,
   0x70110,
   0x80070,
   0x80030,
   0x900c0,
   0x70108,
   0x80060,
   0x80020,
   0x900a0,
   0x80000,
   0x80080,
   0x80040,
   0x900e0,
   0x70104,
   0x80058,
   0x80018,
   0x90090,
   0x70114,
   0x80078,
   0x80038,
   0x900d0,
   0x7010c,
   0x80068,
   0x80028,
   0x900b0,
   0x80008,
   0x80088,
   0x80048,
   0x900f0,
   0x70102,
   0x80054,
   0x80014,
   0x8011c,
   0x70112,
   0x80074,
   0x80034,
   0x900c8,
   0x7010a,
   0x80064,
   0x80024,
   0x900a8,
   0x80004,
   0x80084,
   0x80044,
   0x900e8,
   0x70106,
   0x8005c,
   0x8001c,
   0x90098,
   0x70116,
   0x8007c,
   0x8003c,
   0x900d8,
   0x7010e,
   0x8006c,
   0x8002c,
   0x900b8,
   0x8000c,
   0x8008c,
   0x8004c,
   0x900f8,
   0x70101,
   0x80052,
   0x80012,
   0x8011a,
   0x70111,
   0x80072,
   0x80032,
   0x900c4,
   0x70109,
   0x80062,
   0x80022,
   0x900a4,
   0x80002,
   0x80082,
   0x80042,
   0x900e4,
   0x70105,
   0x8005a,
   0x8001a,
   0x90094,
   0x70115,
   0x8007a,
   0x8003a,
   0x900d4,
   0x7010d,
   0x8006a,
   0x8002a,
   0x900b4,
   0x8000a,
   0x8008a,
   0x8004a,
   0x900f4,
   0x70103,
   0x80056,
   0x80016,
   0x8011e,
   0x70113,
   0x80076,
   0x80036,
   0x900cc,
   0x7010b,
   0x80066,
   0x80026,
   0x900ac,
   0x80006,
   0x80086,
   0x80046,
   0x900ec,
   0x70107,
   0x8005e,
   0x8001e,
   0x9009c,
   0x70117,
   0x8007e,
   0x8003e,
   0x900dc,
   0x7010f,
   0x8006e,
   0x8002e,
   0x900bc,
   0x8000e,
   0x8008e,
   0x8004e,
   0x900fc,
   0x70100,
   0x80051,
   0x80011,
   0x80119,
   0x70110,
   0x80071,
   0x80031,
   0x900c2,
   0x70108,
   0x80061,
   0x80021,
   0x900a2,
   0x80001,
   0x80081,
   0x80041,
   0x900e2,
   0x70104,
   0x80059,
   0x80019,
   0x90092,
   0x70114,
   0x80079,
   0x80039,
   0x900d2,
   0x7010c,
   0x80069,
   0x80029,
   0x900b2,
   0x80009,
   0x80089,
   0x80049,
   0x900f2,
   0x70102,
   0x80055,
   0x80015,
   0x8011d,
   0x70112,
   0x80075,
   0x80035,
   0x900ca,
   0x7010a,
   0x80065,
   0x80025,
   0x900aa,
   0x80005,
   0x80085,
   0x80045,
   0x900ea,
   0x70106,
   0x8005d,
   0x8001d,
   0x9009a,
   0x70116,
   0x8007d,
   0x8003d,
   0x900da,
   0x7010e,
   0x8006d,
   0x8002d,
   0x900ba,
   0x8000d,
   0x8008d,
   0x8004d,
   0x900fa,
   0x70101,
   0x80053,
   0x80013,
   0x8011b,
   0x70111,
   0x80073,
   0x80033,
   0x900c6,
   0x70109,
   0x80063,
   0x80023,
   0x900a6,
   0x80003,
   0x80083,
   0x80043,
   0x900e6,
   0x70105,
   0x8005b,
   0x8001b,
   0x90096,
   0x70115,
   0x8007b,
   0x8003b,
   0x900d6,
   0x7010d,
   0x8006b,
   0x8002b,
   0x900b6,
   0x8000b,
   0x8008b,
   0x8004b,
   0x900f6,
   0x70103,
   0x80057,
   0x80017,
   0x8011f,
   0x70113,
   0x80077,
   0x80037,
   0x900ce,
   0x7010b,
   0x80067,
   0x80027,
   0x900ae,
   0x80007,
   0x80087,
   0x80047,
   0x900ee,
   0x70107,
   0x8005f,
   0x8001f,
   0x9009e,
   0x70117,
   0x8007f,
   0x8003f,
   0x900de,
   0x7010f,
   0x8006f,
   0x8002f,
   0x900be,
   0x8000f,
   0x8008f,
   0x8004f,
   0x900fe,
   0x70100,
   0x80050,
   0x80010,
   0x80118,
   0x70110,
   0x80070,
   0x80030,
   0x900c1,
   0x70108,
   0x80060,
   0x80020,
   0x900a1,
   0x80000,
   0x80080,
   0x80040,
   0x900e1,
   0x70104,
   0x80058,
   0x80018,
   0x90091,
   0x70114,
   0x80078,
   0x80038,
   0x900d1,
   0x7010c,
   0x80068,
   0x80028,
   0x900b1,
   0x80008,
   0x80088,
   0x80048,
   0x900f1,
   0x70102,
   0x80054,
   0x80014,
   0x8011c,
   0x70112,
   0x80074,
   0x80034,
   0x900c9,
   0x7010a,
   0x80064,
   0x80024,
   0x900a9,
   0x80004,
   0x80084,
   0x80044,
   0x900e9,
   0x70106,
   0x8005c,
   0x8001c,
   0x90099,
   0x70116,
   0x8007c,
   0x8003c,
   0x900d9,
   0x7010e,
   0x8006c,
   0x8002c,
   0x900b9,
   0x8000c,
   0x8008c,
   0x8004c,
   0x900f9,
   0x70101,
   0x80052,
   0x80012,
   0x8011a,
   0x70111,
   0x80072,
   0x80032,
   0x900c5,
   0x70109,
   0x80062,
   0x80022,
   0x900a5,
   0x80002,
   0x80082,
   0x80042,
   0x900e5,
   0x70105,
   0x8005a,
   0x8001a,
   0x90095,
   0x70115,
   0x8007a,
   0x8003a,
   0x900d5,
   0x7010d,
   0x8006a,
   0x8002a,
   0x900b5,
   0x8000a,
   0x8008a,
   0x8004a,
   0x900f5,
   0x70103,
   0x80056,
   0x80016,
   0x8011e,
   0x70113,
   0x80076,
   0x80036,
   0x900cd,
   0x7010b,
   0x80066,
   0x80026,
   0x900ad,
   0x80006,
   0x80086,
   0x80046,
   0x900ed,
   0x70107,
   0x8005e,
   0x8001e,
   0x9009d,
   0x70117,
   0x8007e,
   0x8003e,
   0x900dd,
   0x7010f,
   0x8006e,
   0x8002e,
   0x900bd,
   0x8000e,
   0x8008e,
   0x8004e,
   0x900fd,
   0x70100,
   0x80051,
   0x80011,
   0x80119,
   0x70110,
   0x80071,
   0x80031,
   0x900c3,
   0x70108,
   0x80061,
   0x80021,
   0x900a3,
   0x80001,
   0x80081,
   0x80041,
   0x900e3,
   0x70104,
   0x80059,
   0x80019,
   0x90093,
   0x70114,
   0x80079,
   0x80039,
   0x900d3,
   0x7010c,
   0x80069,
   0x80029,
   0x900b3,
   0x80009,
   0x80089,
   0x80049,
   0x900f3,
   0x70102,
   0x80055,
   0x80015,
   0x8011d,
   0x70112,
   0x80075,
   0x80035,
   0x900cb,
   0x7010a,
   0x80065,
   0x80025,
   0x900ab,
   0x80005,
   0x80085,
   0x80045,
   0x900eb,
   0x70106,
   0x8005d,
   0x8001d,
   0x9009b,
   0x70116,
   0x8007d,
   0x8003d,
   0x900db,
   0x7010e,
   0x8006d,
   0x8002d,
   0x900bb,
   0x8000d,
   0x8008d,
   0x8004d,
   0x900fb,
   0x70101,
   0x80053,
   0x80013,
   0x8011b,
   0x70111,
   0x80073,
   0x80033,
   0x900c7,
   0x70109,
   0x80063,
   0x80023,
   0x900a7,
   0x80003,
   0x80083,
   0x80043,
   0x900e7,
   0x70105,
   0x8005b,
   0x8001b,
   0x90097,
   0x70115,
   0x8007b,
   0x8003b,
   0x900d7,
   0x7010d,
   0x8006b,
   0x8002b,
   0x900b7,
   0x8000b,
   0x8008b,
   0x8004b,
   0x900f7,
   0x70103,
   0x80057,
   0x80017,
   0x8011f,
   0x70113,
   0x80077,
   0x80037,
   0x900cf,
   0x7010b,
   0x80067,
   0x80027,
   0x900af,
   0x80007,
   0x80087,
   0x80047,
   0x900ef,
   0x70107,
   0x8005f,
   0x8001f,
   0x9009f,
   0x70117,
   0x8007f,
   0x8003f,
   0x900df,
   0x7010f,
   0x8006f,
   0x8002f,
   0x900bf,
   0x8000f,
   0x8008f,
   0x8004f,
   0x900ff
  ]),
  9
 ];
 var fixedDistCodeTab = [
  new Int32Array([
   0x50000,
   0x50010,
   0x50008,
   0x50018,
   0x50004,
   0x50014,
   0x5000c,
   0x5001c,
   0x50002,
   0x50012,
   0x5000a,
   0x5001a,
   0x50006,
   0x50016,
   0x5000e,
   0x00000,
   0x50001,
   0x50011,
   0x50009,
   0x50019,
   0x50005,
   0x50015,
   0x5000d,
   0x5001d,
   0x50003,
   0x50013,
   0x5000b,
   0x5001b,
   0x50007,
   0x50017,
   0x5000f,
   0x00000
  ]),
  5
 ];
 function FlateStream(str, maybeLength) {
  this.str = str;
  this.dict = str.dict;
  var cmf = str.getByte();
  var flg = str.getByte();
  if (cmf === -1 || flg === -1) {
   error('Invalid header in flate stream: ' + cmf + ', ' + flg);
  }
  if ((cmf & 0x0f) !== 0x08) {
   error('Unknown compression method in flate stream: ' + cmf + ', ' + flg);
  }
  if (((cmf << 8) + flg) % 31 !== 0) {
   error('Bad FCHECK in flate stream: ' + cmf + ', ' + flg);
  }
  if (flg & 0x20) {
   error('FDICT bit set in flate stream: ' + cmf + ', ' + flg);
  }
  this.codeSize = 0;
  this.codeBuf = 0;
  DecodeStream.call(this, maybeLength);
 }
 FlateStream.prototype = Object.create(DecodeStream.prototype);
 FlateStream.prototype.getBits = function FlateStream_getBits(bits) {
  var str = this.str;
  var codeSize = this.codeSize;
  var codeBuf = this.codeBuf;
  var b;
  while (codeSize < bits) {
   if ((b = str.getByte()) === -1) {
    error('Bad encoding in flate stream');
   }
   codeBuf |= b << codeSize;
   codeSize += 8;
  }
  b = codeBuf & (1 << bits) - 1;
  this.codeBuf = codeBuf >> bits;
  this.codeSize = codeSize -= bits;
  return b;
 };
 FlateStream.prototype.getCode = function FlateStream_getCode(table) {
  var str = this.str;
  var codes = table[0];
  var maxLen = table[1];
  var codeSize = this.codeSize;
  var codeBuf = this.codeBuf;
  var b;
  while (codeSize < maxLen) {
   if ((b = str.getByte()) === -1) {
    break;
   }
   codeBuf |= b << codeSize;
   codeSize += 8;
  }
  var code = codes[codeBuf & (1 << maxLen) - 1];
  var codeLen = code >> 16;
  var codeVal = code & 0xffff;
  if (codeLen < 1 || codeSize < codeLen) {
   error('Bad encoding in flate stream');
  }
  this.codeBuf = codeBuf >> codeLen;
  this.codeSize = codeSize - codeLen;
  return codeVal;
 };
 FlateStream.prototype.generateHuffmanTable = function flateStreamGenerateHuffmanTable(lengths) {
  var n = lengths.length;
  var maxLen = 0;
  var i;
  for (i = 0; i < n; ++i) {
   if (lengths[i] > maxLen) {
    maxLen = lengths[i];
   }
  }
  var size = 1 << maxLen;
  var codes = new Int32Array(size);
  for (var len = 1, code = 0, skip = 2; len <= maxLen; ++len, code <<= 1, skip <<= 1) {
   for (var val = 0; val < n; ++val) {
    if (lengths[val] === len) {
     var code2 = 0;
     var t = code;
     for (i = 0; i < len; ++i) {
      code2 = code2 << 1 | t & 1;
      t >>= 1;
     }
     for (i = code2; i < size; i += skip) {
      codes[i] = len << 16 | val;
     }
     ++code;
    }
   }
  }
  return [
   codes,
   maxLen
  ];
 };
 FlateStream.prototype.readBlock = function FlateStream_readBlock() {
  var buffer, len;
  var str = this.str;
  var hdr = this.getBits(3);
  if (hdr & 1) {
   this.eof = true;
  }
  hdr >>= 1;
  if (hdr === 0) {
   var b;
   if ((b = str.getByte()) === -1) {
    error('Bad block header in flate stream');
   }
   var blockLen = b;
   if ((b = str.getByte()) === -1) {
    error('Bad block header in flate stream');
   }
   blockLen |= b << 8;
   if ((b = str.getByte()) === -1) {
    error('Bad block header in flate stream');
   }
   var check = b;
   if ((b = str.getByte()) === -1) {
    error('Bad block header in flate stream');
   }
   check |= b << 8;
   if (check !== (~blockLen & 0xffff) && (blockLen !== 0 || check !== 0)) {
    error('Bad uncompressed block length in flate stream');
   }
   this.codeBuf = 0;
   this.codeSize = 0;
   var bufferLength = this.bufferLength;
   buffer = this.ensureBuffer(bufferLength + blockLen);
   var end = bufferLength + blockLen;
   this.bufferLength = end;
   if (blockLen === 0) {
    if (str.peekByte() === -1) {
     this.eof = true;
    }
   } else {
    for (var n = bufferLength; n < end; ++n) {
     if ((b = str.getByte()) === -1) {
      this.eof = true;
      break;
     }
     buffer[n] = b;
    }
   }
   return;
  }
  var litCodeTable;
  var distCodeTable;
  if (hdr === 1) {
   litCodeTable = fixedLitCodeTab;
   distCodeTable = fixedDistCodeTab;
  } else if (hdr === 2) {
   var numLitCodes = this.getBits(5) + 257;
   var numDistCodes = this.getBits(5) + 1;
   var numCodeLenCodes = this.getBits(4) + 4;
   var codeLenCodeLengths = new Uint8Array(codeLenCodeMap.length);
   var i;
   for (i = 0; i < numCodeLenCodes; ++i) {
    codeLenCodeLengths[codeLenCodeMap[i]] = this.getBits(3);
   }
   var codeLenCodeTab = this.generateHuffmanTable(codeLenCodeLengths);
   len = 0;
   i = 0;
   var codes = numLitCodes + numDistCodes;
   var codeLengths = new Uint8Array(codes);
   var bitsLength, bitsOffset, what;
   while (i < codes) {
    var code = this.getCode(codeLenCodeTab);
    if (code === 16) {
     bitsLength = 2;
     bitsOffset = 3;
     what = len;
    } else if (code === 17) {
     bitsLength = 3;
     bitsOffset = 3;
     what = len = 0;
    } else if (code === 18) {
     bitsLength = 7;
     bitsOffset = 11;
     what = len = 0;
    } else {
     codeLengths[i++] = len = code;
     continue;
    }
    var repeatLength = this.getBits(bitsLength) + bitsOffset;
    while (repeatLength-- > 0) {
     codeLengths[i++] = what;
    }
   }
   litCodeTable = this.generateHuffmanTable(codeLengths.subarray(0, numLitCodes));
   distCodeTable = this.generateHuffmanTable(codeLengths.subarray(numLitCodes, codes));
  } else {
   error('Unknown block type in flate stream');
  }
  buffer = this.buffer;
  var limit = buffer ? buffer.length : 0;
  var pos = this.bufferLength;
  while (true) {
   var code1 = this.getCode(litCodeTable);
   if (code1 < 256) {
    if (pos + 1 >= limit) {
     buffer = this.ensureBuffer(pos + 1);
     limit = buffer.length;
    }
    buffer[pos++] = code1;
    continue;
   }
   if (code1 === 256) {
    this.bufferLength = pos;
    return;
   }
   code1 -= 257;
   code1 = lengthDecode[code1];
   var code2 = code1 >> 16;
   if (code2 > 0) {
    code2 = this.getBits(code2);
   }
   len = (code1 & 0xffff) + code2;
   code1 = this.getCode(distCodeTable);
   code1 = distDecode[code1];
   code2 = code1 >> 16;
   if (code2 > 0) {
    code2 = this.getBits(code2);
   }
   var dist = (code1 & 0xffff) + code2;
   if (pos + len >= limit) {
    buffer = this.ensureBuffer(pos + len);
    limit = buffer.length;
   }
   for (var k = 0; k < len; ++k, ++pos) {
    buffer[pos] = buffer[pos - dist];
   }
  }
 };
 return FlateStream;
}();
var PredictorStream = function PredictorStreamClosure() {
 function PredictorStream(str, maybeLength, params) {
  if (!isDict(params)) {
   return str;
  }
  var predictor = this.predictor = params.get('Predictor') || 1;
  if (predictor <= 1) {
   return str;
  }
  if (predictor !== 2 && (predictor < 10 || predictor > 15)) {
   error('Unsupported predictor: ' + predictor);
  }
  if (predictor === 2) {
   this.readBlock = this.readBlockTiff;
  } else {
   this.readBlock = this.readBlockPng;
  }
  this.str = str;
  this.dict = str.dict;
  var colors = this.colors = params.get('Colors') || 1;
  var bits = this.bits = params.get('BitsPerComponent') || 8;
  var columns = this.columns = params.get('Columns') || 1;
  this.pixBytes = colors * bits + 7 >> 3;
  this.rowBytes = columns * colors * bits + 7 >> 3;
  DecodeStream.call(this, maybeLength);
  return this;
 }
 PredictorStream.prototype = Object.create(DecodeStream.prototype);
 PredictorStream.prototype.readBlockTiff = function predictorStreamReadBlockTiff() {
  var rowBytes = this.rowBytes;
  var bufferLength = this.bufferLength;
  var buffer = this.ensureBuffer(bufferLength + rowBytes);
  var bits = this.bits;
  var colors = this.colors;
  var rawBytes = this.str.getBytes(rowBytes);
  this.eof = !rawBytes.length;
  if (this.eof) {
   return;
  }
  var inbuf = 0, outbuf = 0;
  var inbits = 0, outbits = 0;
  var pos = bufferLength;
  var i;
  if (bits === 1 && colors === 1) {
   for (i = 0; i < rowBytes; ++i) {
    var c = rawBytes[i] ^ inbuf;
    c ^= c >> 1;
    c ^= c >> 2;
    c ^= c >> 4;
    inbuf = (c & 1) << 7;
    buffer[pos++] = c;
   }
  } else if (bits === 8) {
   for (i = 0; i < colors; ++i) {
    buffer[pos++] = rawBytes[i];
   }
   for (; i < rowBytes; ++i) {
    buffer[pos] = buffer[pos - colors] + rawBytes[i];
    pos++;
   }
  } else {
   var compArray = new Uint8Array(colors + 1);
   var bitMask = (1 << bits) - 1;
   var j = 0, k = bufferLength;
   var columns = this.columns;
   for (i = 0; i < columns; ++i) {
    for (var kk = 0; kk < colors; ++kk) {
     if (inbits < bits) {
      inbuf = inbuf << 8 | rawBytes[j++] & 0xFF;
      inbits += 8;
     }
     compArray[kk] = compArray[kk] + (inbuf >> inbits - bits) & bitMask;
     inbits -= bits;
     outbuf = outbuf << bits | compArray[kk];
     outbits += bits;
     if (outbits >= 8) {
      buffer[k++] = outbuf >> outbits - 8 & 0xFF;
      outbits -= 8;
     }
    }
   }
   if (outbits > 0) {
    buffer[k++] = (outbuf << 8 - outbits) + (inbuf & (1 << 8 - outbits) - 1);
   }
  }
  this.bufferLength += rowBytes;
 };
 PredictorStream.prototype.readBlockPng = function predictorStreamReadBlockPng() {
  var rowBytes = this.rowBytes;
  var pixBytes = this.pixBytes;
  var predictor = this.str.getByte();
  var rawBytes = this.str.getBytes(rowBytes);
  this.eof = !rawBytes.length;
  if (this.eof) {
   return;
  }
  var bufferLength = this.bufferLength;
  var buffer = this.ensureBuffer(bufferLength + rowBytes);
  var prevRow = buffer.subarray(bufferLength - rowBytes, bufferLength);
  if (prevRow.length === 0) {
   prevRow = new Uint8Array(rowBytes);
  }
  var i, j = bufferLength, up, c;
  switch (predictor) {
  case 0:
   for (i = 0; i < rowBytes; ++i) {
    buffer[j++] = rawBytes[i];
   }
   break;
  case 1:
   for (i = 0; i < pixBytes; ++i) {
    buffer[j++] = rawBytes[i];
   }
   for (; i < rowBytes; ++i) {
    buffer[j] = buffer[j - pixBytes] + rawBytes[i] & 0xFF;
    j++;
   }
   break;
  case 2:
   for (i = 0; i < rowBytes; ++i) {
    buffer[j++] = prevRow[i] + rawBytes[i] & 0xFF;
   }
   break;
  case 3:
   for (i = 0; i < pixBytes; ++i) {
    buffer[j++] = (prevRow[i] >> 1) + rawBytes[i];
   }
   for (; i < rowBytes; ++i) {
    buffer[j] = (prevRow[i] + buffer[j - pixBytes] >> 1) + rawBytes[i] & 0xFF;
    j++;
   }
   break;
  case 4:
   for (i = 0; i < pixBytes; ++i) {
    up = prevRow[i];
    c = rawBytes[i];
    buffer[j++] = up + c;
   }
   for (; i < rowBytes; ++i) {
    up = prevRow[i];
    var upLeft = prevRow[i - pixBytes];
    var left = buffer[j - pixBytes];
    var p = left + up - upLeft;
    var pa = p - left;
    if (pa < 0) {
     pa = -pa;
    }
    var pb = p - up;
    if (pb < 0) {
     pb = -pb;
    }
    var pc = p - upLeft;
    if (pc < 0) {
     pc = -pc;
    }
    c = rawBytes[i];
    if (pa <= pb && pa <= pc) {
     buffer[j++] = left + c;
    } else if (pb <= pc) {
     buffer[j++] = up + c;
    } else {
     buffer[j++] = upLeft + c;
    }
   }
   break;
  default:
   error('Unsupported predictor: ' + predictor);
  }
  this.bufferLength += rowBytes;
 };
 return PredictorStream;
}();
var JpegStream = function JpegStreamClosure() {
 function JpegStream(stream, maybeLength, dict, params) {
  var ch;
  while ((ch = stream.getByte()) !== -1) {
   if (ch === 0xFF) {
    stream.skip(-1);
    break;
   }
  }
  this.stream = stream;
  this.maybeLength = maybeLength;
  this.dict = dict;
  this.params = params;
  DecodeStream.call(this, maybeLength);
 }
 JpegStream.prototype = Object.create(DecodeStream.prototype);
 Object.defineProperty(JpegStream.prototype, 'bytes', {
  get: function JpegStream_bytes() {
   return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
  },
  configurable: true
 });
 JpegStream.prototype.ensureBuffer = function JpegStream_ensureBuffer(req) {
  if (this.bufferLength) {
   return;
  }
  var jpegImage = new JpegImage();
  var decodeArr = this.dict.getArray('Decode', 'D');
  if (this.forceRGB && isArray(decodeArr)) {
   var bitsPerComponent = this.dict.get('BitsPerComponent') || 8;
   var decodeArrLength = decodeArr.length;
   var transform = new Int32Array(decodeArrLength);
   var transformNeeded = false;
   var maxValue = (1 << bitsPerComponent) - 1;
   for (var i = 0; i < decodeArrLength; i += 2) {
    transform[i] = (decodeArr[i + 1] - decodeArr[i]) * 256 | 0;
    transform[i + 1] = decodeArr[i] * maxValue | 0;
    if (transform[i] !== 256 || transform[i + 1] !== 0) {
     transformNeeded = true;
    }
   }
   if (transformNeeded) {
    jpegImage.decodeTransform = transform;
   }
  }
  if (isDict(this.params)) {
   var colorTransform = this.params.get('ColorTransform');
   if (isInt(colorTransform)) {
    jpegImage.colorTransform = colorTransform;
   }
  }
  jpegImage.parse(this.bytes);
  var data = jpegImage.getData(this.drawWidth, this.drawHeight, this.forceRGB);
  this.buffer = data;
  this.bufferLength = data.length;
  this.eof = true;
 };
 JpegStream.prototype.getBytes = function JpegStream_getBytes(length) {
  this.ensureBuffer();
  return this.buffer;
 };
 JpegStream.prototype.getIR = function JpegStream_getIR(forceDataSchema) {
  return createObjectURL(this.bytes, 'image/jpeg', forceDataSchema);
 };
 return JpegStream;
}();
var JpxStream = function JpxStreamClosure() {
 function JpxStream(stream, maybeLength, dict, params) {
  this.stream = stream;
  this.maybeLength = maybeLength;
  this.dict = dict;
  this.params = params;
  DecodeStream.call(this, maybeLength);
 }
 JpxStream.prototype = Object.create(DecodeStream.prototype);
 Object.defineProperty(JpxStream.prototype, 'bytes', {
  get: function JpxStream_bytes() {
   return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
  },
  configurable: true
 });
 JpxStream.prototype.ensureBuffer = function JpxStream_ensureBuffer(req) {
  if (this.bufferLength) {
   return;
  }
  var jpxImage = new JpxImage();
  jpxImage.parse(this.bytes);
  var width = jpxImage.width;
  var height = jpxImage.height;
  var componentsCount = jpxImage.componentsCount;
  var tileCount = jpxImage.tiles.length;
  if (tileCount === 1) {
   this.buffer = jpxImage.tiles[0].items;
  } else {
   var data = new Uint8Array(width * height * componentsCount);
   for (var k = 0; k < tileCount; k++) {
    var tileComponents = jpxImage.tiles[k];
    var tileWidth = tileComponents.width;
    var tileHeight = tileComponents.height;
    var tileLeft = tileComponents.left;
    var tileTop = tileComponents.top;
    var src = tileComponents.items;
    var srcPosition = 0;
    var dataPosition = (width * tileTop + tileLeft) * componentsCount;
    var imgRowSize = width * componentsCount;
    var tileRowSize = tileWidth * componentsCount;
    for (var j = 0; j < tileHeight; j++) {
     var rowBytes = src.subarray(srcPosition, srcPosition + tileRowSize);
     data.set(rowBytes, dataPosition);
     srcPosition += tileRowSize;
     dataPosition += imgRowSize;
    }
   }
   this.buffer = data;
  }
  this.bufferLength = this.buffer.length;
  this.eof = true;
 };
 return JpxStream;
}();
var Jbig2Stream = function Jbig2StreamClosure() {
 function Jbig2Stream(stream, maybeLength, dict, params) {
  this.stream = stream;
  this.maybeLength = maybeLength;
  this.dict = dict;
  this.params = params;
  DecodeStream.call(this, maybeLength);
 }
 Jbig2Stream.prototype = Object.create(DecodeStream.prototype);
 Object.defineProperty(Jbig2Stream.prototype, 'bytes', {
  get: function Jbig2Stream_bytes() {
   return shadow(this, 'bytes', this.stream.getBytes(this.maybeLength));
  },
  configurable: true
 });
 Jbig2Stream.prototype.ensureBuffer = function Jbig2Stream_ensureBuffer(req) {
  if (this.bufferLength) {
   return;
  }
  var jbig2Image = new Jbig2Image();
  var chunks = [];
  if (isDict(this.params)) {
   var globalsStream = this.params.get('JBIG2Globals');
   if (isStream(globalsStream)) {
    var globals = globalsStream.getBytes();
    chunks.push({
     data: globals,
     start: 0,
     end: globals.length
    });
   }
  }
  chunks.push({
   data: this.bytes,
   start: 0,
   end: this.bytes.length
  });
  var data = jbig2Image.parseChunks(chunks);
  var dataLength = data.length;
  for (var i = 0; i < dataLength; i++) {
   data[i] ^= 0xFF;
  }
  this.buffer = data;
  this.bufferLength = dataLength;
  this.eof = true;
 };
 return Jbig2Stream;
}();
var DecryptStream = function DecryptStreamClosure() {
 function DecryptStream(str, maybeLength, decrypt) {
  this.str = str;
  this.dict = str.dict;
  this.decrypt = decrypt;
  this.nextChunk = null;
  this.initialized = false;
  DecodeStream.call(this, maybeLength);
 }
 var chunkSize = 512;
 DecryptStream.prototype = Object.create(DecodeStream.prototype);
 DecryptStream.prototype.readBlock = function DecryptStream_readBlock() {
  var chunk;
  if (this.initialized) {
   chunk = this.nextChunk;
  } else {
   chunk = this.str.getBytes(chunkSize);
   this.initialized = true;
  }
  if (!chunk || chunk.length === 0) {
   this.eof = true;
   return;
  }
  this.nextChunk = this.str.getBytes(chunkSize);
  var hasMoreData = this.nextChunk && this.nextChunk.length > 0;
  var decrypt = this.decrypt;
  chunk = decrypt(chunk, !hasMoreData);
  var bufferLength = this.bufferLength;
  var i, n = chunk.length;
  var buffer = this.ensureBuffer(bufferLength + n);
  for (i = 0; i < n; i++) {
   buffer[bufferLength++] = chunk[i];
  }
  this.bufferLength = bufferLength;
 };
 return DecryptStream;
}();
var Ascii85Stream = function Ascii85StreamClosure() {
 function Ascii85Stream(str, maybeLength) {
  this.str = str;
  this.dict = str.dict;
  this.input = new Uint8Array(5);
  if (maybeLength) {
   maybeLength = 0.8 * maybeLength;
  }
  DecodeStream.call(this, maybeLength);
 }
 Ascii85Stream.prototype = Object.create(DecodeStream.prototype);
 Ascii85Stream.prototype.readBlock = function Ascii85Stream_readBlock() {
  var TILDA_CHAR = 0x7E;
  var Z_LOWER_CHAR = 0x7A;
  var EOF = -1;
  var str = this.str;
  var c = str.getByte();
  while (isSpace(c)) {
   c = str.getByte();
  }
  if (c === EOF || c === TILDA_CHAR) {
   this.eof = true;
   return;
  }
  var bufferLength = this.bufferLength, buffer;
  var i;
  if (c === Z_LOWER_CHAR) {
   buffer = this.ensureBuffer(bufferLength + 4);
   for (i = 0; i < 4; ++i) {
    buffer[bufferLength + i] = 0;
   }
   this.bufferLength += 4;
  } else {
   var input = this.input;
   input[0] = c;
   for (i = 1; i < 5; ++i) {
    c = str.getByte();
    while (isSpace(c)) {
     c = str.getByte();
    }
    input[i] = c;
    if (c === EOF || c === TILDA_CHAR) {
     break;
    }
   }
   buffer = this.ensureBuffer(bufferLength + i - 1);
   this.bufferLength += i - 1;
   if (i < 5) {
    for (; i < 5; ++i) {
     input[i] = 0x21 + 84;
    }
    this.eof = true;
   }
   var t = 0;
   for (i = 0; i < 5; ++i) {
    t = t * 85 + (input[i] - 0x21);
   }
   for (i = 3; i >= 0; --i) {
    buffer[bufferLength + i] = t & 0xFF;
    t >>= 8;
   }
  }
 };
 return Ascii85Stream;
}();
var AsciiHexStream = function AsciiHexStreamClosure() {
 function AsciiHexStream(str, maybeLength) {
  this.str = str;
  this.dict = str.dict;
  this.firstDigit = -1;
  if (maybeLength) {
   maybeLength = 0.5 * maybeLength;
  }
  DecodeStream.call(this, maybeLength);
 }
 AsciiHexStream.prototype = Object.create(DecodeStream.prototype);
 AsciiHexStream.prototype.readBlock = function AsciiHexStream_readBlock() {
  var UPSTREAM_BLOCK_SIZE = 8000;
  var bytes = this.str.getBytes(UPSTREAM_BLOCK_SIZE);
  if (!bytes.length) {
   this.eof = true;
   return;
  }
  var maxDecodeLength = bytes.length + 1 >> 1;
  var buffer = this.ensureBuffer(this.bufferLength + maxDecodeLength);
  var bufferLength = this.bufferLength;
  var firstDigit = this.firstDigit;
  for (var i = 0, ii = bytes.length; i < ii; i++) {
   var ch = bytes[i], digit;
   if (ch >= 0x30 && ch <= 0x39) {
    digit = ch & 0x0F;
   } else if (ch >= 0x41 && ch <= 0x46 || ch >= 0x61 && ch <= 0x66) {
    digit = (ch & 0x0F) + 9;
   } else if (ch === 0x3E) {
    this.eof = true;
    break;
   } else {
    continue;
   }
   if (firstDigit < 0) {
    firstDigit = digit;
   } else {
    buffer[bufferLength++] = firstDigit << 4 | digit;
    firstDigit = -1;
   }
  }
  if (firstDigit >= 0 && this.eof) {
   buffer[bufferLength++] = firstDigit << 4;
   firstDigit = -1;
  }
  this.firstDigit = firstDigit;
  this.bufferLength = bufferLength;
 };
 return AsciiHexStream;
}();
var RunLengthStream = function RunLengthStreamClosure() {
 function RunLengthStream(str, maybeLength) {
  this.str = str;
  this.dict = str.dict;
  DecodeStream.call(this, maybeLength);
 }
 RunLengthStream.prototype = Object.create(DecodeStream.prototype);
 RunLengthStream.prototype.readBlock = function RunLengthStream_readBlock() {
  var repeatHeader = this.str.getBytes(2);
  if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] === 128) {
   this.eof = true;
   return;
  }
  var buffer;
  var bufferLength = this.bufferLength;
  var n = repeatHeader[0];
  if (n < 128) {
   buffer = this.ensureBuffer(bufferLength + n + 1);
   buffer[bufferLength++] = repeatHeader[1];
   if (n > 0) {
    var source = this.str.getBytes(n);
    buffer.set(source, bufferLength);
    bufferLength += n;
   }
  } else {
   n = 257 - n;
   var b = repeatHeader[1];
   buffer = this.ensureBuffer(bufferLength + n + 1);
   for (var i = 0; i < n; i++) {
    buffer[bufferLength++] = b;
   }
  }
  this.bufferLength = bufferLength;
 };
 return RunLengthStream;
}();
var CCITTFaxStream = function CCITTFaxStreamClosure() {
 var ccittEOL = -2;
 var ccittEOF = -1;
 var twoDimPass = 0;
 var twoDimHoriz = 1;
 var twoDimVert0 = 2;
 var twoDimVertR1 = 3;
 var twoDimVertL1 = 4;
 var twoDimVertR2 = 5;
 var twoDimVertL2 = 6;
 var twoDimVertR3 = 7;
 var twoDimVertL3 = 8;
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  [
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   -1
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   twoDimVertL2
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   twoDimVertR2
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  [
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   twoDimPass
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   twoDimHoriz
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   twoDimHoriz
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   twoDimHoriz
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   3,
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   3,
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   3,
   twoDimHoriz
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   3,
   twoDimHoriz
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  [
   3,
   twoDimHoriz
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  [
   3,
   twoDimHoriz
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  [
   3,
   twoDimHoriz
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   twoDimVertL1
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   twoDimVertL1
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   3,
   twoDimVertL1
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   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   3,
   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   twoDimVertR1
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   3,
   twoDimVertR1
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  [
   3,
   twoDimVertR1
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   twoDimVert0
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   twoDimVert0
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  [
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   twoDimVert0
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   twoDimVert0
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   1,
   twoDimVert0
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   1,
   twoDimVert0
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   1,
   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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  [
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   twoDimVert0
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  [
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   twoDimVert0
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  [
   1,
   twoDimVert0
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  [
   1,
   twoDimVert0
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  [
   1,
   twoDimVert0
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   twoDimVert0
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  [
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   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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   1,
   twoDimVert0
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   1,
   twoDimVert0
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   1,
   twoDimVert0
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  [
   1,
   twoDimVert0
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  [
   1,
   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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   twoDimVert0
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  [
   1,
   twoDimVert0
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  [
   1,
   twoDimVert0
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  [
   1,
   twoDimVert0
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  [
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  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   7,
   11
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   9,
   15
  ],
  [
   12,
   128
  ],
  [
   12,
   192
  ],
  [
   12,
   26
  ],
  [
   12,
   27
  ],
  [
   12,
   28
  ],
  [
   12,
   29
  ],
  [
   11,
   19
  ],
  [
   11,
   19
  ],
  [
   11,
   20
  ],
  [
   11,
   20
  ],
  [
   12,
   34
  ],
  [
   12,
   35
  ],
  [
   12,
   36
  ],
  [
   12,
   37
  ],
  [
   12,
   38
  ],
  [
   12,
   39
  ],
  [
   11,
   21
  ],
  [
   11,
   21
  ],
  [
   12,
   42
  ],
  [
   12,
   43
  ],
  [
   10,
   0
  ],
  [
   10,
   0
  ],
  [
   10,
   0
  ],
  [
   10,
   0
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ],
  [
   7,
   12
  ]
 ];
 var blackTable3 = [
  [
   -1,
   -1
  ],
  [
   -1,
   -1
  ],
  [
   -1,
   -1
  ],
  [
   -1,
   -1
  ],
  [
   6,
   9
  ],
  [
   6,
   8
  ],
  [
   5,
   7
  ],
  [
   5,
   7
  ],
  [
   4,
   6
  ],
  [
   4,
   6
  ],
  [
   4,
   6
  ],
  [
   4,
   6
  ],
  [
   4,
   5
  ],
  [
   4,
   5
  ],
  [
   4,
   5
  ],
  [
   4,
   5
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   1
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   3,
   4
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   3
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ],
  [
   2,
   2
  ]
 ];
 function CCITTFaxStream(str, maybeLength, params) {
  this.str = str;
  this.dict = str.dict;
  params = params || Dict.empty;
  this.encoding = params.get('K') || 0;
  this.eoline = params.get('EndOfLine') || false;
  this.byteAlign = params.get('EncodedByteAlign') || false;
  this.columns = params.get('Columns') || 1728;
  this.rows = params.get('Rows') || 0;
  var eoblock = params.get('EndOfBlock');
  if (eoblock === null || eoblock === undefined) {
   eoblock = true;
  }
  this.eoblock = eoblock;
  this.black = params.get('BlackIs1') || false;
  this.codingLine = new Uint32Array(this.columns + 1);
  this.refLine = new Uint32Array(this.columns + 2);
  this.codingLine[0] = this.columns;
  this.codingPos = 0;
  this.row = 0;
  this.nextLine2D = this.encoding < 0;
  this.inputBits = 0;
  this.inputBuf = 0;
  this.outputBits = 0;
  var code1;
  while ((code1 = this.lookBits(12)) === 0) {
   this.eatBits(1);
  }
  if (code1 === 1) {
   this.eatBits(12);
  }
  if (this.encoding > 0) {
   this.nextLine2D = !this.lookBits(1);
   this.eatBits(1);
  }
  DecodeStream.call(this, maybeLength);
 }
 CCITTFaxStream.prototype = Object.create(DecodeStream.prototype);
 CCITTFaxStream.prototype.readBlock = function CCITTFaxStream_readBlock() {
  while (!this.eof) {
   var c = this.lookChar();
   this.ensureBuffer(this.bufferLength + 1);
   this.buffer[this.bufferLength++] = c;
  }
 };
 CCITTFaxStream.prototype.addPixels = function ccittFaxStreamAddPixels(a1, blackPixels) {
  var codingLine = this.codingLine;
  var codingPos = this.codingPos;
  if (a1 > codingLine[codingPos]) {
   if (a1 > this.columns) {
    info('row is wrong length');
    this.err = true;
    a1 = this.columns;
   }
   if (codingPos & 1 ^ blackPixels) {
    ++codingPos;
   }
   codingLine[codingPos] = a1;
  }
  this.codingPos = codingPos;
 };
 CCITTFaxStream.prototype.addPixelsNeg = function ccittFaxStreamAddPixelsNeg(a1, blackPixels) {
  var codingLine = this.codingLine;
  var codingPos = this.codingPos;
  if (a1 > codingLine[codingPos]) {
   if (a1 > this.columns) {
    info('row is wrong length');
    this.err = true;
    a1 = this.columns;
   }
   if (codingPos & 1 ^ blackPixels) {
    ++codingPos;
   }
   codingLine[codingPos] = a1;
  } else if (a1 < codingLine[codingPos]) {
   if (a1 < 0) {
    info('invalid code');
    this.err = true;
    a1 = 0;
   }
   while (codingPos > 0 && a1 < codingLine[codingPos - 1]) {
    --codingPos;
   }
   codingLine[codingPos] = a1;
  }
  this.codingPos = codingPos;
 };
 CCITTFaxStream.prototype.lookChar = function CCITTFaxStream_lookChar() {
  var refLine = this.refLine;
  var codingLine = this.codingLine;
  var columns = this.columns;
  var refPos, blackPixels, bits, i;
  if (this.outputBits === 0) {
   if (this.eof) {
    return null;
   }
   this.err = false;
   var code1, code2, code3;
   if (this.nextLine2D) {
    for (i = 0; codingLine[i] < columns; ++i) {
     refLine[i] = codingLine[i];
    }
    refLine[i++] = columns;
    refLine[i] = columns;
    codingLine[0] = 0;
    this.codingPos = 0;
    refPos = 0;
    blackPixels = 0;
    while (codingLine[this.codingPos] < columns) {
     code1 = this.getTwoDimCode();
     switch (code1) {
     case twoDimPass:
      this.addPixels(refLine[refPos + 1], blackPixels);
      if (refLine[refPos + 1] < columns) {
       refPos += 2;
      }
      break;
     case twoDimHoriz:
      code1 = code2 = 0;
      if (blackPixels) {
       do {
        code1 += code3 = this.getBlackCode();
       } while (code3 >= 64);
       do {
        code2 += code3 = this.getWhiteCode();
       } while (code3 >= 64);
      } else {
       do {
        code1 += code3 = this.getWhiteCode();
       } while (code3 >= 64);
       do {
        code2 += code3 = this.getBlackCode();
       } while (code3 >= 64);
      }
      this.addPixels(codingLine[this.codingPos] + code1, blackPixels);
      if (codingLine[this.codingPos] < columns) {
       this.addPixels(codingLine[this.codingPos] + code2, blackPixels ^ 1);
      }
      while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
       refPos += 2;
      }
      break;
     case twoDimVertR3:
      this.addPixels(refLine[refPos] + 3, blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       ++refPos;
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case twoDimVertR2:
      this.addPixels(refLine[refPos] + 2, blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       ++refPos;
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case twoDimVertR1:
      this.addPixels(refLine[refPos] + 1, blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       ++refPos;
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case twoDimVert0:
      this.addPixels(refLine[refPos], blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       ++refPos;
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case twoDimVertL3:
      this.addPixelsNeg(refLine[refPos] - 3, blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       if (refPos > 0) {
        --refPos;
       } else {
        ++refPos;
       }
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case twoDimVertL2:
      this.addPixelsNeg(refLine[refPos] - 2, blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       if (refPos > 0) {
        --refPos;
       } else {
        ++refPos;
       }
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case twoDimVertL1:
      this.addPixelsNeg(refLine[refPos] - 1, blackPixels);
      blackPixels ^= 1;
      if (codingLine[this.codingPos] < columns) {
       if (refPos > 0) {
        --refPos;
       } else {
        ++refPos;
       }
       while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
        refPos += 2;
       }
      }
      break;
     case ccittEOF:
      this.addPixels(columns, 0);
      this.eof = true;
      break;
     default:
      info('bad 2d code');
      this.addPixels(columns, 0);
      this.err = true;
     }
    }
   } else {
    codingLine[0] = 0;
    this.codingPos = 0;
    blackPixels = 0;
    while (codingLine[this.codingPos] < columns) {
     code1 = 0;
     if (blackPixels) {
      do {
       code1 += code3 = this.getBlackCode();
      } while (code3 >= 64);
     } else {
      do {
       code1 += code3 = this.getWhiteCode();
      } while (code3 >= 64);
     }
     this.addPixels(codingLine[this.codingPos] + code1, blackPixels);
     blackPixels ^= 1;
    }
   }
   var gotEOL = false;
   if (this.byteAlign) {
    this.inputBits &= ~7;
   }
   if (!this.eoblock && this.row === this.rows - 1) {
    this.eof = true;
   } else {
    code1 = this.lookBits(12);
    if (this.eoline) {
     while (code1 !== ccittEOF && code1 !== 1) {
      this.eatBits(1);
      code1 = this.lookBits(12);
     }
    } else {
     while (code1 === 0) {
      this.eatBits(1);
      code1 = this.lookBits(12);
     }
    }
    if (code1 === 1) {
     this.eatBits(12);
     gotEOL = true;
    } else if (code1 === ccittEOF) {
     this.eof = true;
    }
   }
   if (!this.eof && this.encoding > 0) {
    this.nextLine2D = !this.lookBits(1);
    this.eatBits(1);
   }
   if (this.eoblock && gotEOL && this.byteAlign) {
    code1 = this.lookBits(12);
    if (code1 === 1) {
     this.eatBits(12);
     if (this.encoding > 0) {
      this.lookBits(1);
      this.eatBits(1);
     }
     if (this.encoding >= 0) {
      for (i = 0; i < 4; ++i) {
       code1 = this.lookBits(12);
       if (code1 !== 1) {
        info('bad rtc code: ' + code1);
       }
       this.eatBits(12);
       if (this.encoding > 0) {
        this.lookBits(1);
        this.eatBits(1);
       }
      }
     }
     this.eof = true;
    }
   } else if (this.err && this.eoline) {
    while (true) {
     code1 = this.lookBits(13);
     if (code1 === ccittEOF) {
      this.eof = true;
      return null;
     }
     if (code1 >> 1 === 1) {
      break;
     }
     this.eatBits(1);
    }
    this.eatBits(12);
    if (this.encoding > 0) {
     this.eatBits(1);
     this.nextLine2D = !(code1 & 1);
    }
   }
   if (codingLine[0] > 0) {
    this.outputBits = codingLine[this.codingPos = 0];
   } else {
    this.outputBits = codingLine[this.codingPos = 1];
   }
   this.row++;
  }
  var c;
  if (this.outputBits >= 8) {
   c = this.codingPos & 1 ? 0 : 0xFF;
   this.outputBits -= 8;
   if (this.outputBits === 0 && codingLine[this.codingPos] < columns) {
    this.codingPos++;
    this.outputBits = codingLine[this.codingPos] - codingLine[this.codingPos - 1];
   }
  } else {
   bits = 8;
   c = 0;
   do {
    if (this.outputBits > bits) {
     c <<= bits;
     if (!(this.codingPos & 1)) {
      c |= 0xFF >> 8 - bits;
     }
     this.outputBits -= bits;
     bits = 0;
    } else {
     c <<= this.outputBits;
     if (!(this.codingPos & 1)) {
      c |= 0xFF >> 8 - this.outputBits;
     }
     bits -= this.outputBits;
     this.outputBits = 0;
     if (codingLine[this.codingPos] < columns) {
      this.codingPos++;
      this.outputBits = codingLine[this.codingPos] - codingLine[this.codingPos - 1];
     } else if (bits > 0) {
      c <<= bits;
      bits = 0;
     }
    }
   } while (bits);
  }
  if (this.black) {
   c ^= 0xFF;
  }
  return c;
 };
 CCITTFaxStream.prototype.findTableCode = function ccittFaxStreamFindTableCode(start, end, table, limit) {
  var limitValue = limit || 0;
  for (var i = start; i <= end; ++i) {
   var code = this.lookBits(i);
   if (code === ccittEOF) {
    return [
     true,
     1,
     false
    ];
   }
   if (i < end) {
    code <<= end - i;
   }
   if (!limitValue || code >= limitValue) {
    var p = table[code - limitValue];
    if (p[0] === i) {
     this.eatBits(i);
     return [
      true,
      p[1],
      true
     ];
    }
   }
  }
  return [
   false,
   0,
   false
  ];
 };
 CCITTFaxStream.prototype.getTwoDimCode = function ccittFaxStreamGetTwoDimCode() {
  var code = 0;
  var p;
  if (this.eoblock) {
   code = this.lookBits(7);
   p = twoDimTable[code];
   if (p && p[0] > 0) {
    this.eatBits(p[0]);
    return p[1];
   }
  } else {
   var result = this.findTableCode(1, 7, twoDimTable);
   if (result[0] && result[2]) {
    return result[1];
   }
  }
  info('Bad two dim code');
  return ccittEOF;
 };
 CCITTFaxStream.prototype.getWhiteCode = function ccittFaxStreamGetWhiteCode() {
  var code = 0;
  var p;
  if (this.eoblock) {
   code = this.lookBits(12);
   if (code === ccittEOF) {
    return 1;
   }
   if (code >> 5 === 0) {
    p = whiteTable1[code];
   } else {
    p = whiteTable2[code >> 3];
   }
   if (p[0] > 0) {
    this.eatBits(p[0]);
    return p[1];
   }
  } else {
   var result = this.findTableCode(1, 9, whiteTable2);
   if (result[0]) {
    return result[1];
   }
   result = this.findTableCode(11, 12, whiteTable1);
   if (result[0]) {
    return result[1];
   }
  }
  info('bad white code');
  this.eatBits(1);
  return 1;
 };
 CCITTFaxStream.prototype.getBlackCode = function ccittFaxStreamGetBlackCode() {
  var code, p;
  if (this.eoblock) {
   code = this.lookBits(13);
   if (code === ccittEOF) {
    return 1;
   }
   if (code >> 7 === 0) {
    p = blackTable1[code];
   } else if (code >> 9 === 0 && code >> 7 !== 0) {
    p = blackTable2[(code >> 1) - 64];
   } else {
    p = blackTable3[code >> 7];
   }
   if (p[0] > 0) {
    this.eatBits(p[0]);
    return p[1];
   }
  } else {
   var result = this.findTableCode(2, 6, blackTable3);
   if (result[0]) {
    return result[1];
   }
   result = this.findTableCode(7, 12, blackTable2, 64);
   if (result[0]) {
    return result[1];
   }
   result = this.findTableCode(10, 13, blackTable1);
   if (result[0]) {
    return result[1];
   }
  }
  info('bad black code');
  this.eatBits(1);
  return 1;
 };
 CCITTFaxStream.prototype.lookBits = function CCITTFaxStream_lookBits(n) {
  var c;
  while (this.inputBits < n) {
   if ((c = this.str.getByte()) === -1) {
    if (this.inputBits === 0) {
     return ccittEOF;
    }
    return this.inputBuf << n - this.inputBits & 0xFFFF >> 16 - n;
   }
   this.inputBuf = this.inputBuf << 8 | c;
   this.inputBits += 8;
  }
  return this.inputBuf >> this.inputBits - n & 0xFFFF >> 16 - n;
 };
 CCITTFaxStream.prototype.eatBits = function CCITTFaxStream_eatBits(n) {
  if ((this.inputBits -= n) < 0) {
   this.inputBits = 0;
  }
 };
 return CCITTFaxStream;
}();
var LZWStream = function LZWStreamClosure() {
 function LZWStream(str, maybeLength, earlyChange) {
  this.str = str;
  this.dict = str.dict;
  this.cachedData = 0;
  this.bitsCached = 0;
  var maxLzwDictionarySize = 4096;
  var lzwState = {
   earlyChange: earlyChange,
   codeLength: 9,
   nextCode: 258,
   dictionaryValues: new Uint8Array(maxLzwDictionarySize),
   dictionaryLengths: new Uint16Array(maxLzwDictionarySize),
   dictionaryPrevCodes: new Uint16Array(maxLzwDictionarySize),
   currentSequence: new Uint8Array(maxLzwDictionarySize),
   currentSequenceLength: 0
  };
  for (var i = 0; i < 256; ++i) {
   lzwState.dictionaryValues[i] = i;
   lzwState.dictionaryLengths[i] = 1;
  }
  this.lzwState = lzwState;
  DecodeStream.call(this, maybeLength);
 }
 LZWStream.prototype = Object.create(DecodeStream.prototype);
 LZWStream.prototype.readBits = function LZWStream_readBits(n) {
  var bitsCached = this.bitsCached;
  var cachedData = this.cachedData;
  while (bitsCached < n) {
   var c = this.str.getByte();
   if (c === -1) {
    this.eof = true;
    return null;
   }
   cachedData = cachedData << 8 | c;
   bitsCached += 8;
  }
  this.bitsCached = bitsCached -= n;
  this.cachedData = cachedData;
  this.lastCode = null;
  return cachedData >>> bitsCached & (1 << n) - 1;
 };
 LZWStream.prototype.readBlock = function LZWStream_readBlock() {
  var blockSize = 512;
  var estimatedDecodedSize = blockSize * 2, decodedSizeDelta = blockSize;
  var i, j, q;
  var lzwState = this.lzwState;
  if (!lzwState) {
   return;
  }
  var earlyChange = lzwState.earlyChange;
  var nextCode = lzwState.nextCode;
  var dictionaryValues = lzwState.dictionaryValues;
  var dictionaryLengths = lzwState.dictionaryLengths;
  var dictionaryPrevCodes = lzwState.dictionaryPrevCodes;
  var codeLength = lzwState.codeLength;
  var prevCode = lzwState.prevCode;
  var currentSequence = lzwState.currentSequence;
  var currentSequenceLength = lzwState.currentSequenceLength;
  var decodedLength = 0;
  var currentBufferLength = this.bufferLength;
  var buffer = this.ensureBuffer(this.bufferLength + estimatedDecodedSize);
  for (i = 0; i < blockSize; i++) {
   var code = this.readBits(codeLength);
   var hasPrev = currentSequenceLength > 0;
   if (code < 256) {
    currentSequence[0] = code;
    currentSequenceLength = 1;
   } else if (code >= 258) {
    if (code < nextCode) {
     currentSequenceLength = dictionaryLengths[code];
     for (j = currentSequenceLength - 1, q = code; j >= 0; j--) {
      currentSequence[j] = dictionaryValues[q];
      q = dictionaryPrevCodes[q];
     }
    } else {
     currentSequence[currentSequenceLength++] = currentSequence[0];
    }
   } else if (code === 256) {
    codeLength = 9;
    nextCode = 258;
    currentSequenceLength = 0;
    continue;
   } else {
    this.eof = true;
    delete this.lzwState;
    break;
   }
   if (hasPrev) {
    dictionaryPrevCodes[nextCode] = prevCode;
    dictionaryLengths[nextCode] = dictionaryLengths[prevCode] + 1;
    dictionaryValues[nextCode] = currentSequence[0];
    nextCode++;
    codeLength = nextCode + earlyChange & nextCode + earlyChange - 1 ? codeLength : Math.min(Math.log(nextCode + earlyChange) / 0.6931471805599453 + 1, 12) | 0;
   }
   prevCode = code;
   decodedLength += currentSequenceLength;
   if (estimatedDecodedSize < decodedLength) {
    do {
     estimatedDecodedSize += decodedSizeDelta;
    } while (estimatedDecodedSize < decodedLength);
    buffer = this.ensureBuffer(this.bufferLength + estimatedDecodedSize);
   }
   for (j = 0; j < currentSequenceLength; j++) {
    buffer[currentBufferLength++] = currentSequence[j];
   }
  }
  lzwState.nextCode = nextCode;
  lzwState.codeLength = codeLength;
  lzwState.prevCode = prevCode;
  lzwState.currentSequenceLength = currentSequenceLength;
  this.bufferLength = currentBufferLength;
 };
 return LZWStream;
}();
var NullStream = function NullStreamClosure() {
 function NullStream() {
  Stream.call(this, new Uint8Array(0));
 }
 NullStream.prototype = Stream.prototype;
 return NullStream;
}();
exports.Ascii85Stream = Ascii85Stream;
exports.AsciiHexStream = AsciiHexStream;
exports.CCITTFaxStream = CCITTFaxStream;
exports.DecryptStream = DecryptStream;
exports.DecodeStream = DecodeStream;
exports.FlateStream = FlateStream;
exports.Jbig2Stream = Jbig2Stream;
exports.JpegStream = JpegStream;
exports.JpxStream = JpxStream;
exports.NullStream = NullStream;
exports.PredictorStream = PredictorStream;
exports.RunLengthStream = RunLengthStream;
exports.Stream = Stream;
exports.StreamsSequenceStream = StreamsSequenceStream;
exports.StringStream = StringStream;
exports.LZWStream = LZWStream;