/* 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;
var twoDimTable = [
[
-1,
-1
],
[
-1,
-1
],
[
7,
twoDimVertL3
],
[
7,
twoDimVertR3
],
[
6,
twoDimVertL2
],
[
6,
twoDimVertL2
],
[
6,
twoDimVertR2
],
[
6,
twoDimVertR2
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
4,
twoDimPass
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimHoriz
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertL1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
3,
twoDimVertR1
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
],
[
1,
twoDimVert0
]
];
var whiteTable1 = [
[
-1,
-1
],
[
12,
ccittEOL
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
11,
1792
],
[
11,
1792
],
[
12,
1984
],
[
12,
2048
],
[
12,
2112
],
[
12,
2176
],
[
12,
2240
],
[
12,
2304
],
[
11,
1856
],
[
11,
1856
],
[
11,
1920
],
[
11,
1920
],
[
12,
2368
],
[
12,
2432
],
[
12,
2496
],
[
12,
2560
]
];
var whiteTable2 = [
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
8,
29
],
[
8,
29
],
[
8,
30
],
[
8,
30
],
[
8,
45
],
[
8,
45
],
[
8,
46
],
[
8,
46
],
[
7,
22
],
[
7,
22
],
[
7,
22
],
[
7,
22
],
[
7,
23
],
[
7,
23
],
[
7,
23
],
[
7,
23
],
[
8,
47
],
[
8,
47
],
[
8,
48
],
[
8,
48
],
[
6,
13
],
[
6,
13
],
[
6,
13
],
[
6,
13
],
[
6,
13
],
[
6,
13
],
[
6,
13
],
[
6,
13
],
[
7,
20
],
[
7,
20
],
[
7,
20
],
[
7,
20
],
[
8,
33
],
[
8,
33
],
[
8,
34
],
[
8,
34
],
[
8,
35
],
[
8,
35
],
[
8,
36
],
[
8,
36
],
[
8,
37
],
[
8,
37
],
[
8,
38
],
[
8,
38
],
[
7,
19
],
[
7,
19
],
[
7,
19
],
[
7,
19
],
[
8,
31
],
[
8,
31
],
[
8,
32
],
[
8,
32
],
[
6,
1
],
[
6,
1
],
[
6,
1
],
[
6,
1
],
[
6,
1
],
[
6,
1
],
[
6,
1
],
[
6,
1
],
[
6,
12
],
[
6,
12
],
[
6,
12
],
[
6,
12
],
[
6,
12
],
[
6,
12
],
[
6,
12
],
[
6,
12
],
[
8,
53
],
[
8,
53
],
[
8,
54
],
[
8,
54
],
[
7,
26
],
[
7,
26
],
[
7,
26
],
[
7,
26
],
[
8,
39
],
[
8,
39
],
[
8,
40
],
[
8,
40
],
[
8,
41
],
[
8,
41
],
[
8,
42
],
[
8,
42
],
[
8,
43
],
[
8,
43
],
[
8,
44
],
[
8,
44
],
[
7,
21
],
[
7,
21
],
[
7,
21
],
[
7,
21
],
[
7,
28
],
[
7,
28
],
[
7,
28
],
[
7,
28
],
[
8,
61
],
[
8,
61
],
[
8,
62
],
[
8,
62
],
[
8,
63
],
[
8,
63
],
[
8,
0
],
[
8,
0
],
[
8,
320
],
[
8,
320
],
[
8,
384
],
[
8,
384
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
10
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
5,
11
],
[
7,
27
],
[
7,
27
],
[
7,
27
],
[
7,
27
],
[
8,
59
],
[
8,
59
],
[
8,
60
],
[
8,
60
],
[
9,
1472
],
[
9,
1536
],
[
9,
1600
],
[
9,
1728
],
[
7,
18
],
[
7,
18
],
[
7,
18
],
[
7,
18
],
[
7,
24
],
[
7,
24
],
[
7,
24
],
[
7,
24
],
[
8,
49
],
[
8,
49
],
[
8,
50
],
[
8,
50
],
[
8,
51
],
[
8,
51
],
[
8,
52
],
[
8,
52
],
[
7,
25
],
[
7,
25
],
[
7,
25
],
[
7,
25
],
[
8,
55
],
[
8,
55
],
[
8,
56
],
[
8,
56
],
[
8,
57
],
[
8,
57
],
[
8,
58
],
[
8,
58
],
[
6,
192
],
[
6,
192
],
[
6,
192
],
[
6,
192
],
[
6,
192
],
[
6,
192
],
[
6,
192
],
[
6,
192
],
[
6,
1664
],
[
6,
1664
],
[
6,
1664
],
[
6,
1664
],
[
6,
1664
],
[
6,
1664
],
[
6,
1664
],
[
6,
1664
],
[
8,
448
],
[
8,
448
],
[
8,
512
],
[
8,
512
],
[
9,
704
],
[
9,
768
],
[
8,
640
],
[
8,
640
],
[
8,
576
],
[
8,
576
],
[
9,
832
],
[
9,
896
],
[
9,
960
],
[
9,
1024
],
[
9,
1088
],
[
9,
1152
],
[
9,
1216
],
[
9,
1280
],
[
9,
1344
],
[
9,
1408
],
[
7,
256
],
[
7,
256
],
[
7,
256
],
[
7,
256
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
2
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
4,
3
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
128
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
8
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
5,
9
],
[
6,
16
],
[
6,
16
],
[
6,
16
],
[
6,
16
],
[
6,
16
],
[
6,
16
],
[
6,
16
],
[
6,
16
],
[
6,
17
],
[
6,
17
],
[
6,
17
],
[
6,
17
],
[
6,
17
],
[
6,
17
],
[
6,
17
],
[
6,
17
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
4
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
4,
5
],
[
6,
14
],
[
6,
14
],
[
6,
14
],
[
6,
14
],
[
6,
14
],
[
6,
14
],
[
6,
14
],
[
6,
14
],
[
6,
15
],
[
6,
15
],
[
6,
15
],
[
6,
15
],
[
6,
15
],
[
6,
15
],
[
6,
15
],
[
6,
15
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
5,
64
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
6
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
],
[
4,
7
]
];
var blackTable1 = [
[
-1,
-1
],
[
-1,
-1
],
[
12,
ccittEOL
],
[
12,
ccittEOL
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
-1,
-1
],
[
11,
1792
],
[
11,
1792
],
[
11,
1792
],
[
11,
1792
],
[
12,
1984
],
[
12,
1984
],
[
12,
2048
],
[
12,
2048
],
[
12,
2112
],
[
12,
2112
],
[
12,
2176
],
[
12,
2176
],
[
12,
2240
],
[
12,
2240
],
[
12,
2304
],
[
12,
2304
],
[
11,
1856
],
[
11,
1856
],
[
11,
1856
],
[
11,
1856
],
[
11,
1920
],
[
11,
1920
],
[
11,
1920
],
[
11,
1920
],
[
12,
2368
],
[
12,
2368
],
[
12,
2432
],
[
12,
2432
],
[
12,
2496
],
[
12,
2496
],
[
12,
2560
],
[
12,
2560
],
[
10,
18
],
[
10,
18
],
[
10,
18
],
[
10,
18
],
[
10,
18
],
[
10,
18
],
[
10,
18
],
[
10,
18
],
[
12,
52
],
[
12,
52
],
[
13,
640
],
[
13,
704
],
[
13,
768
],
[
13,
832
],
[
12,
55
],
[
12,
55
],
[
12,
56
],
[
12,
56
],
[
13,
1280
],
[
13,
1344
],
[
13,
1408
],
[
13,
1472
],
[
12,
59
],
[
12,
59
],
[
12,
60
],
[
12,
60
],
[
13,
1536
],
[
13,
1600
],
[
11,
24
],
[
11,
24
],
[
11,
24
],
[
11,
24
],
[
11,
25
],
[
11,
25
],
[
11,
25
],
[
11,
25
],
[
13,
1664
],
[
13,
1728
],
[
12,
320
],
[
12,
320
],
[
12,
384
],
[
12,
384
],
[
12,
448
],
[
12,
448
],
[
13,
512
],
[
13,
576
],
[
12,
53
],
[
12,
53
],
[
12,
54
],
[
12,
54
],
[
13,
896
],
[
13,
960
],
[
13,
1024
],
[
13,
1088
],
[
13,
1152
],
[
13,
1216
],
[
10,
64
],
[
10,
64
],
[
10,
64
],
[
10,
64
],
[
10,
64
],
[
10,
64
],
[
10,
64
],
[
10,
64
]
];
var blackTable2 = [
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
8,
13
],
[
11,
23
],
[
11,
23
],
[
12,
50
],
[
12,
51
],
[
12,
44
],
[
12,
45
],
[
12,
46
],
[
12,
47
],
[
12,
57
],
[
12,
58
],
[
12,
61
],
[
12,
256
],
[
10,
16
],
[
10,
16
],
[
10,
16
],
[
10,
16
],
[
10,
17
],
[
10,
17
],
[
10,
17
],
[
10,
17
],
[
12,
48
],
[
12,
49
],
[
12,
62
],
[
12,
63
],
[
12,
30
],
[
12,
31
],
[
12,
32
],
[
12,
33
],
[
12,
40
],
[
12,
41
],
[
11,
22
],
[
11,
22
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
8,
14
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
7,
10
],
[
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
],
[
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;