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-rw-r--r--apps/files_pdfviewer/js/pdfjs/src/stream.js2294
1 files changed, 0 insertions, 2294 deletions
diff --git a/apps/files_pdfviewer/js/pdfjs/src/stream.js b/apps/files_pdfviewer/js/pdfjs/src/stream.js
deleted file mode 100644
index 48c462fb2c3..00000000000
--- a/apps/files_pdfviewer/js/pdfjs/src/stream.js
+++ /dev/null
@@ -1,2294 +0,0 @@
-/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
-
-'use strict';
-
-var Stream = (function StreamClosure() {
- function Stream(arrayBuffer, start, length, dict) {
- this.bytes = new Uint8Array(arrayBuffer);
- this.start = start || 0;
- this.pos = this.start;
- this.end = (start + length) || this.bytes.length;
- this.dict = dict;
- }
-
- // required methods for a stream. if a particular stream does not
- // implement these, an error should be thrown
- Stream.prototype = {
- get length() {
- return this.end - this.start;
- },
- getByte: function Stream_getByte() {
- if (this.pos >= this.end)
- return null;
- return this.bytes[this.pos++];
- },
- // returns subarray of original buffer
- // should only be read
- 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);
- },
- lookChar: function Stream_lookChar() {
- if (this.pos >= this.end)
- return null;
- return String.fromCharCode(this.bytes[this.pos]);
- },
- getChar: function Stream_getChar() {
- if (this.pos >= this.end)
- return null;
- return String.fromCharCode(this.bytes[this.pos++]);
- },
- 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);
- },
- isStream: true
- };
-
- 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;
-})();
-
-// super class for the decoding streams
-var DecodeStream = (function DecodeStreamClosure() {
- function DecodeStream() {
- this.pos = 0;
- this.bufferLength = 0;
- this.eof = false;
- this.buffer = null;
- }
-
- DecodeStream.prototype = {
- ensureBuffer: function DecodeStream_ensureBuffer(requested) {
- var buffer = this.buffer;
- var current = buffer ? buffer.byteLength : 0;
- if (requested < current)
- return buffer;
- var size = 512;
- while (size < requested)
- size <<= 1;
- var buffer2 = new Uint8Array(size);
- for (var i = 0; i < current; ++i)
- buffer2[i] = buffer[i];
- return (this.buffer = buffer2);
- },
- getByte: function DecodeStream_getByte() {
- var pos = this.pos;
- while (this.bufferLength <= pos) {
- if (this.eof)
- return null;
- this.readBlock();
- }
- return this.buffer[this.pos++];
- },
- 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;
-
- // checking if bufferLength is still 0 then
- // the buffer has to be initialized
- if (!end)
- this.buffer = new Uint8Array(0);
- }
-
- this.pos = end;
- return this.buffer.subarray(pos, end);
- },
- lookChar: function DecodeStream_lookChar() {
- var pos = this.pos;
- while (this.bufferLength <= pos) {
- if (this.eof)
- return null;
- this.readBlock();
- }
- return String.fromCharCode(this.buffer[this.pos]);
- },
- getChar: function DecodeStream_getChar() {
- var pos = this.pos;
- while (this.bufferLength <= pos) {
- if (this.eof)
- return null;
- this.readBlock();
- }
- return String.fromCharCode(this.buffer[this.pos++]);
- },
- 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;
- }
- };
-
- return DecodeStream;
-})();
-
-var FakeStream = (function FakeStreamClosure() {
- function FakeStream(stream) {
- this.dict = stream.dict;
- DecodeStream.call(this);
- }
-
- FakeStream.prototype = Object.create(DecodeStream.prototype);
- FakeStream.prototype.readBlock = function FakeStream_readBlock() {
- var bufferLength = this.bufferLength;
- bufferLength += 1024;
- var buffer = this.ensureBuffer(bufferLength);
- this.bufferLength = bufferLength;
- };
-
- FakeStream.prototype.getBytes = function FakeStream_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 {
- this.eof = true;
- end = this.bufferLength;
- }
-
- this.pos = end;
- return this.buffer.subarray(pos, end);
- };
-
- return FakeStream;
-})();
-
-var StreamsSequenceStream = (function StreamsSequenceStreamClosure() {
- function StreamsSequenceStream(streams) {
- this.streams = streams;
- DecodeStream.call(this);
- }
-
- 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;
- };
-
- return StreamsSequenceStream;
-})();
-
-var FlateStream = (function FlateStreamClosure() {
- var codeLenCodeMap = new Uint32Array([
- 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
- ]);
-
- var lengthDecode = new Uint32Array([
- 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 Uint32Array([
- 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 Uint32Array([
- 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 Uint32Array([
- 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(stream) {
- var bytes = stream.getBytes();
- var bytesPos = 0;
-
- this.dict = stream.dict;
- var cmf = bytes[bytesPos++];
- var flg = bytes[bytesPos++];
- 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.bytes = bytes;
- this.bytesPos = bytesPos;
-
- this.codeSize = 0;
- this.codeBuf = 0;
-
- DecodeStream.call(this);
- }
-
- FlateStream.prototype = Object.create(DecodeStream.prototype);
-
- FlateStream.prototype.getBits = function FlateStream_getBits(bits) {
- var codeSize = this.codeSize;
- var codeBuf = this.codeBuf;
- var bytes = this.bytes;
- var bytesPos = this.bytesPos;
-
- var b;
- while (codeSize < bits) {
- if (typeof (b = bytes[bytesPos++]) == 'undefined')
- error('Bad encoding in flate stream');
- codeBuf |= b << codeSize;
- codeSize += 8;
- }
- b = codeBuf & ((1 << bits) - 1);
- this.codeBuf = codeBuf >> bits;
- this.codeSize = codeSize -= bits;
- this.bytesPos = bytesPos;
- return b;
- };
-
- FlateStream.prototype.getCode = function FlateStream_getCode(table) {
- var codes = table[0];
- var maxLen = table[1];
- var codeSize = this.codeSize;
- var codeBuf = this.codeBuf;
- var bytes = this.bytes;
- var bytesPos = this.bytesPos;
-
- while (codeSize < maxLen) {
- var b;
- if (typeof (b = bytes[bytesPos++]) == 'undefined')
- error('Bad encoding in flate stream');
- codeBuf |= (b << codeSize);
- codeSize += 8;
- }
- var code = codes[codeBuf & ((1 << maxLen) - 1)];
- var codeLen = code >> 16;
- var codeVal = code & 0xffff;
- if (codeSize == 0 || codeSize < codeLen || codeLen == 0)
- error('Bad encoding in flate stream');
- this.codeBuf = (codeBuf >> codeLen);
- this.codeSize = (codeSize - codeLen);
- this.bytesPos = bytesPos;
- return codeVal;
- };
-
- FlateStream.prototype.generateHuffmanTable =
- function flateStreamGenerateHuffmanTable(lengths) {
- var n = lengths.length;
-
- // find max code length
- var maxLen = 0;
- for (var i = 0; i < n; ++i) {
- if (lengths[i] > maxLen)
- maxLen = lengths[i];
- }
-
- // build the table
- var size = 1 << maxLen;
- var codes = new Uint32Array(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) {
- // bit-reverse the code
- var code2 = 0;
- var t = code;
- for (var i = 0; i < len; ++i) {
- code2 = (code2 << 1) | (t & 1);
- t >>= 1;
- }
-
- // fill the table entries
- for (var i = code2; i < size; i += skip)
- codes[i] = (len << 16) | val;
-
- ++code;
- }
- }
- }
-
- return [codes, maxLen];
- };
-
- FlateStream.prototype.readBlock = function FlateStream_readBlock() {
- // read block header
- var hdr = this.getBits(3);
- if (hdr & 1)
- this.eof = true;
- hdr >>= 1;
-
- if (hdr == 0) { // uncompressed block
- var bytes = this.bytes;
- var bytesPos = this.bytesPos;
- var b;
-
- if (typeof (b = bytes[bytesPos++]) == 'undefined')
- error('Bad block header in flate stream');
- var blockLen = b;
- if (typeof (b = bytes[bytesPos++]) == 'undefined')
- error('Bad block header in flate stream');
- blockLen |= (b << 8);
- if (typeof (b = bytes[bytesPos++]) == 'undefined')
- error('Bad block header in flate stream');
- var check = b;
- if (typeof (b = bytes[bytesPos++]) == 'undefined')
- error('Bad block header in flate stream');
- check |= (b << 8);
- if (check != (~blockLen & 0xffff))
- error('Bad uncompressed block length in flate stream');
-
- this.codeBuf = 0;
- this.codeSize = 0;
-
- var bufferLength = this.bufferLength;
- var buffer = this.ensureBuffer(bufferLength + blockLen);
- var end = bufferLength + blockLen;
- this.bufferLength = end;
- for (var n = bufferLength; n < end; ++n) {
- if (typeof (b = bytes[bytesPos++]) == 'undefined') {
- this.eof = true;
- break;
- }
- buffer[n] = b;
- }
- this.bytesPos = bytesPos;
- return;
- }
-
- var litCodeTable;
- var distCodeTable;
- if (hdr == 1) { // compressed block, fixed codes
- litCodeTable = fixedLitCodeTab;
- distCodeTable = fixedDistCodeTab;
- } else if (hdr == 2) { // compressed block, dynamic codes
- var numLitCodes = this.getBits(5) + 257;
- var numDistCodes = this.getBits(5) + 1;
- var numCodeLenCodes = this.getBits(4) + 4;
-
- // build the code lengths code table
- var codeLenCodeLengths = new Uint8Array(codeLenCodeMap.length);
-
- for (var i = 0; i < numCodeLenCodes; ++i)
- codeLenCodeLengths[codeLenCodeMap[i]] = this.getBits(3);
- var codeLenCodeTab = this.generateHuffmanTable(codeLenCodeLengths);
-
- // build the literal and distance code tables
- var len = 0;
- var i = 0;
- var codes = numLitCodes + numDistCodes;
- var codeLengths = new Uint8Array(codes);
- while (i < codes) {
- var code = this.getCode(codeLenCodeTab);
- if (code == 16) {
- var bitsLength = 2, bitsOffset = 3, what = len;
- } else if (code == 17) {
- var bitsLength = 3, bitsOffset = 3, what = (len = 0);
- } else if (code == 18) {
- var 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');
- }
-
- var 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);
- var 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(stream, params) {
- var predictor = this.predictor = params.get('Predictor') || 1;
-
- if (predictor <= 1)
- return stream; // no prediction
- if (predictor !== 2 && (predictor < 10 || predictor > 15))
- error('Unsupported predictor: ' + predictor);
-
- if (predictor === 2)
- this.readBlock = this.readBlockTiff;
- else
- this.readBlock = this.readBlockPng;
-
- this.stream = stream;
- this.dict = stream.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);
- 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.stream.getBytes(rowBytes);
-
- var inbuf = 0, outbuf = 0;
- var inbits = 0, outbits = 0;
- var pos = bufferLength;
-
- if (bits === 1) {
- for (var i = 0; i < rowBytes; ++i) {
- var c = rawBytes[i];
- inbuf = (inbuf << 8) | c;
- // bitwise addition is exclusive or
- // first shift inbuf and then add
- buffer[pos++] = (c ^ (inbuf >> colors)) & 0xFF;
- // truncate inbuf (assumes colors < 16)
- inbuf &= 0xFFFF;
- }
- } else if (bits === 8) {
- for (var 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 (var 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.stream.getByte();
- var rawBytes = this.stream.getBytes(rowBytes);
-
- 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 j = bufferLength;
- switch (predictor) {
- case 0:
- for (var i = 0; i < rowBytes; ++i)
- buffer[j++] = rawBytes[i];
- break;
- case 1:
- for (var 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 (var i = 0; i < rowBytes; ++i)
- buffer[j++] = (prevRow[i] + rawBytes[i]) & 0xFF;
- break;
- case 3:
- for (var 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:
- // we need to save the up left pixels values. the simplest way
- // is to create a new buffer
- for (var i = 0; i < pixBytes; ++i) {
- var up = prevRow[i];
- var c = rawBytes[i];
- buffer[j++] = up + c;
- }
- for (; i < rowBytes; ++i) {
- var 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;
-
- var 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;
-})();
-
-/**
- * Depending on the type of JPEG a JpegStream is handled in different ways. For
- * JPEG's that are supported natively such as DeviceGray and DeviceRGB the image
- * data is stored and then loaded by the browser. For unsupported JPEG's we use
- * a library to decode these images and the stream behaves like all the other
- * DecodeStreams.
- */
-var JpegStream = (function JpegStreamClosure() {
- function isAdobeImage(bytes) {
- var maxBytesScanned = Math.max(bytes.length - 16, 1024);
- // Looking for APP14, 'Adobe'
- for (var i = 0; i < maxBytesScanned; ++i) {
- if (bytes[i] == 0xFF && bytes[i + 1] == 0xEE &&
- bytes[i + 2] == 0x00 && bytes[i + 3] == 0x0E &&
- bytes[i + 4] == 0x41 && bytes[i + 5] == 0x64 &&
- bytes[i + 6] == 0x6F && bytes[i + 7] == 0x62 &&
- bytes[i + 8] == 0x65 && bytes[i + 9] == 0x00)
- return true;
- // scanning until frame tag
- if (bytes[i] == 0xFF && bytes[i + 1] == 0xC0)
- break;
- }
- return false;
- }
-
- function fixAdobeImage(bytes) {
- // Inserting 'EMBED' marker after JPEG signature
- var embedMarker = new Uint8Array([0xFF, 0xEC, 0, 8, 0x45, 0x4D, 0x42, 0x45,
- 0x44, 0]);
- var newBytes = new Uint8Array(bytes.length + embedMarker.length);
- newBytes.set(bytes, embedMarker.length);
- // copy JPEG header
- newBytes[0] = bytes[0];
- newBytes[1] = bytes[1];
- newBytes.set(embedMarker, 2);
- return newBytes;
- }
-
- function JpegStream(bytes, dict, xref) {
- // TODO: per poppler, some images may have 'junk' before that
- // need to be removed
- this.dict = dict;
-
- this.isAdobeImage = false;
- this.colorTransform = dict.get('ColorTransform') || -1;
-
- if (isAdobeImage(bytes)) {
- this.isAdobeImage = true;
- bytes = fixAdobeImage(bytes);
- }
-
- this.bytes = bytes;
-
- DecodeStream.call(this);
- }
-
- JpegStream.prototype = Object.create(DecodeStream.prototype);
-
- JpegStream.prototype.ensureBuffer = function JpegStream_ensureBuffer(req) {
- if (this.bufferLength)
- return;
- try {
- var jpegImage = new JpegImage();
- if (this.colorTransform != -1)
- jpegImage.colorTransform = this.colorTransform;
- jpegImage.parse(this.bytes);
- var width = jpegImage.width;
- var height = jpegImage.height;
- var data = jpegImage.getData(width, height);
- this.buffer = data;
- this.bufferLength = data.length;
- } catch (e) {
- error('JPEG error: ' + e);
- }
- };
- JpegStream.prototype.getIR = function JpegStream_getIR() {
- return bytesToString(this.bytes);
- };
- JpegStream.prototype.getChar = function JpegStream_getChar() {
- error('internal error: getChar is not valid on JpegStream');
- };
- /**
- * Checks if the image can be decoded and displayed by the browser without any
- * further processing such as color space conversions.
- */
- JpegStream.prototype.isNativelySupported =
- function JpegStream_isNativelySupported(xref, res) {
- var cs = ColorSpace.parse(this.dict.get('ColorSpace'), xref, res);
- // when bug 674619 lands, let's check if browser can do
- // normal cmyk and then we won't need to decode in JS
- if (cs.name === 'DeviceGray' || cs.name === 'DeviceRGB')
- return true;
- if (cs.name === 'DeviceCMYK' && !this.isAdobeImage &&
- this.colorTransform < 1)
- return true;
- return false;
- };
- /**
- * Checks if the image can be decoded by the browser.
- */
- JpegStream.prototype.isNativelyDecodable =
- function JpegStream_isNativelyDecodable(xref, res) {
- var cs = ColorSpace.parse(this.dict.get('ColorSpace'), xref, res);
- var numComps = cs.numComps;
- if (numComps == 1 || numComps == 3)
- return true;
-
- return false;
- };
-
- return JpegStream;
-})();
-
-/**
- * For JPEG 2000's we use a library to decode these images and
- * the stream behaves like all the other DecodeStreams.
- */
-var JpxStream = (function JpxStreamClosure() {
- function JpxStream(bytes, dict) {
- this.dict = dict;
- this.bytes = bytes;
-
- DecodeStream.call(this);
- }
-
- JpxStream.prototype = Object.create(DecodeStream.prototype);
-
- 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;
- if (componentsCount != 1 && componentsCount != 3 && componentsCount != 4)
- error('JPX with ' + componentsCount + ' components is not supported');
-
- var data = new Uint8Array(width * height * componentsCount);
-
- for (var k = 0, kk = jpxImage.tiles.length; k < kk; k++) {
- var tileCompoments = jpxImage.tiles[k];
- var tileWidth = tileCompoments[0].width;
- var tileHeight = tileCompoments[0].height;
- var tileLeft = tileCompoments[0].left;
- var tileTop = tileCompoments[0].top;
-
- var dataPosition, sourcePosition, data0, data1, data2, data3, rowFeed;
- switch (componentsCount) {
- case 1:
- data0 = tileCompoments[0].items;
-
- dataPosition = width * tileTop + tileLeft;
- rowFeed = width - tileWidth;
- sourcePosition = 0;
- for (var j = 0; j < tileHeight; j++) {
- for (var i = 0; i < tileWidth; i++)
- data[dataPosition++] = data0[sourcePosition++];
- dataPosition += rowFeed;
- }
- break;
- case 3:
- data0 = tileCompoments[0].items;
- data1 = tileCompoments[1].items;
- data2 = tileCompoments[2].items;
-
- dataPosition = (width * tileTop + tileLeft) * 3;
- rowFeed = (width - tileWidth) * 3;
- sourcePosition = 0;
- for (var j = 0; j < tileHeight; j++) {
- for (var i = 0; i < tileWidth; i++) {
- data[dataPosition++] = data0[sourcePosition];
- data[dataPosition++] = data1[sourcePosition];
- data[dataPosition++] = data2[sourcePosition];
- sourcePosition++;
- }
- dataPosition += rowFeed;
- }
- break;
- case 4:
- data0 = tileCompoments[0].items;
- data1 = tileCompoments[1].items;
- data2 = tileCompoments[2].items;
- data3 = tileCompoments[3].items;
-
- dataPosition = (width * tileTop + tileLeft) * 4;
- rowFeed = (width - tileWidth) * 4;
- sourcePosition = 0;
- for (var j = 0; j < tileHeight; j++) {
- for (var i = 0; i < tileWidth; i++) {
- data[dataPosition++] = data0[sourcePosition];
- data[dataPosition++] = data1[sourcePosition];
- data[dataPosition++] = data2[sourcePosition];
- data[dataPosition++] = data3[sourcePosition];
- sourcePosition++;
- }
- dataPosition += rowFeed;
- }
- break;
- }
- }
-
- this.buffer = data;
- this.bufferLength = data.length;
- };
- JpxStream.prototype.getChar = function JpxStream_getChar() {
- error('internal error: getChar is not valid on JpxStream');
- };
-
- return JpxStream;
-})();
-
-var DecryptStream = (function DecryptStreamClosure() {
- function DecryptStream(str, decrypt) {
- this.str = str;
- this.dict = str.dict;
- this.decrypt = decrypt;
-
- DecodeStream.call(this);
- }
-
- var chunkSize = 512;
-
- DecryptStream.prototype = Object.create(DecodeStream.prototype);
-
- DecryptStream.prototype.readBlock = function DecryptStream_readBlock() {
- var chunk = this.str.getBytes(chunkSize);
- if (!chunk || chunk.length == 0) {
- this.eof = true;
- return;
- }
- var decrypt = this.decrypt;
- chunk = decrypt(chunk);
-
- 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) {
- this.str = str;
- this.dict = str.dict;
- this.input = new Uint8Array(5);
-
- DecodeStream.call(this);
- }
-
- Ascii85Stream.prototype = Object.create(DecodeStream.prototype);
-
- Ascii85Stream.prototype.readBlock = function Ascii85Stream_readBlock() {
- var tildaCode = '~'.charCodeAt(0);
- var zCode = 'z'.charCodeAt(0);
- var str = this.str;
-
- var c = str.getByte();
- while (Lexer.isSpace(String.fromCharCode(c)))
- c = str.getByte();
-
- if (!c || c === tildaCode) {
- this.eof = true;
- return;
- }
-
- var bufferLength = this.bufferLength, buffer;
-
- // special code for z
- if (c == zCode) {
- buffer = this.ensureBuffer(bufferLength + 4);
- for (var i = 0; i < 4; ++i)
- buffer[bufferLength + i] = 0;
- this.bufferLength += 4;
- } else {
- var input = this.input;
- input[0] = c;
- for (var i = 1; i < 5; ++i) {
- c = str.getByte();
- while (Lexer.isSpace(String.fromCharCode(c)))
- c = str.getByte();
-
- input[i] = c;
-
- if (!c || c == tildaCode)
- break;
- }
- buffer = this.ensureBuffer(bufferLength + i - 1);
- this.bufferLength += i - 1;
-
- // partial ending;
- if (i < 5) {
- for (; i < 5; ++i)
- input[i] = 0x21 + 84;
- this.eof = true;
- }
- var t = 0;
- for (var i = 0; i < 5; ++i)
- t = t * 85 + (input[i] - 0x21);
-
- for (var i = 3; i >= 0; --i) {
- buffer[bufferLength + i] = t & 0xFF;
- t >>= 8;
- }
- }
- };
-
- return Ascii85Stream;
-})();
-
-var AsciiHexStream = (function AsciiHexStreamClosure() {
- function AsciiHexStream(str) {
- this.str = str;
- this.dict = str.dict;
-
- DecodeStream.call(this);
- }
-
- var hexvalueMap = {
- 9: -1, // \t
- 32: -1, // space
- 48: 0,
- 49: 1,
- 50: 2,
- 51: 3,
- 52: 4,
- 53: 5,
- 54: 6,
- 55: 7,
- 56: 8,
- 57: 9,
- 65: 10,
- 66: 11,
- 67: 12,
- 68: 13,
- 69: 14,
- 70: 15,
- 97: 10,
- 98: 11,
- 99: 12,
- 100: 13,
- 101: 14,
- 102: 15
- };
-
- AsciiHexStream.prototype = Object.create(DecodeStream.prototype);
-
- AsciiHexStream.prototype.readBlock = function AsciiHexStream_readBlock() {
- var gtCode = '>'.charCodeAt(0), bytes = this.str.getBytes(), c, n,
- decodeLength, buffer, bufferLength, i, length;
-
- decodeLength = (bytes.length + 1) >> 1;
- buffer = this.ensureBuffer(this.bufferLength + decodeLength);
- bufferLength = this.bufferLength;
-
- for (i = 0, length = bytes.length; i < length; i++) {
- c = hexvalueMap[bytes[i]];
- while (c == -1 && (i + 1) < length) {
- c = hexvalueMap[bytes[++i]];
- }
-
- if ((i + 1) < length && (bytes[i + 1] !== gtCode)) {
- n = hexvalueMap[bytes[++i]];
- buffer[bufferLength++] = c * 16 + n;
- } else {
- // EOD marker at an odd number, behave as if a 0 followed the last
- // digit.
- if (bytes[i] !== gtCode) {
- buffer[bufferLength++] = c * 16;
- }
- }
- }
-
- this.bufferLength = bufferLength;
- this.eof = true;
- };
-
- return AsciiHexStream;
-})();
-
-var RunLengthStream = (function RunLengthStreamClosure() {
- function RunLengthStream(str) {
- this.str = str;
- this.dict = str.dict;
-
- DecodeStream.call(this);
- }
-
- RunLengthStream.prototype = Object.create(DecodeStream.prototype);
-
- RunLengthStream.prototype.readBlock = function RunLengthStream_readBlock() {
- // The repeatHeader has following format. The first byte defines type of run
- // and amount of bytes to repeat/copy: n = 0 through 127 - copy next n bytes
- // (in addition to the second byte from the header), n = 129 through 255 -
- // duplicate the second byte from the header (257 - n) times, n = 128 - end.
- var repeatHeader = this.str.getBytes(2);
- if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] == 128) {
- this.eof = true;
- return;
- }
-
- var bufferLength = this.bufferLength;
- var n = repeatHeader[0];
- if (n < 128) {
- // copy n bytes
- var 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];
- var 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 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], // 000000x
- [7, twoDimVertL3], // 0000010
- [7, twoDimVertR3], // 0000011
- [6, twoDimVertL2], [6, twoDimVertL2], // 000010x
- [6, twoDimVertR2], [6, twoDimVertR2], // 000011x
- [4, twoDimPass], [4, twoDimPass], // 0001xxx
- [4, twoDimPass], [4, twoDimPass],
- [4, twoDimPass], [4, twoDimPass],
- [4, twoDimPass], [4, twoDimPass],
- [3, twoDimHoriz], [3, twoDimHoriz], // 001xxxx
- [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], // 010xxxx
- [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], // 011xxxx
- [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], // 1xxxxxx
- [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], // 00000
- [12, ccittEOL], // 00001
- [-1, -1], [-1, -1], // 0001x
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 001xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 010xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 011xx
- [11, 1792], [11, 1792], // 1000x
- [12, 1984], // 10010
- [12, 2048], // 10011
- [12, 2112], // 10100
- [12, 2176], // 10101
- [12, 2240], // 10110
- [12, 2304], // 10111
- [11, 1856], [11, 1856], // 1100x
- [11, 1920], [11, 1920], // 1101x
- [12, 2368], // 11100
- [12, 2432], // 11101
- [12, 2496], // 11110
- [12, 2560] // 11111
- ];
-
- var whiteTable2 = [
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 0000000xx
- [8, 29], [8, 29], // 00000010x
- [8, 30], [8, 30], // 00000011x
- [8, 45], [8, 45], // 00000100x
- [8, 46], [8, 46], // 00000101x
- [7, 22], [7, 22], [7, 22], [7, 22], // 0000011xx
- [7, 23], [7, 23], [7, 23], [7, 23], // 0000100xx
- [8, 47], [8, 47], // 00001010x
- [8, 48], [8, 48], // 00001011x
- [6, 13], [6, 13], [6, 13], [6, 13], // 000011xxx
- [6, 13], [6, 13], [6, 13], [6, 13],
- [7, 20], [7, 20], [7, 20], [7, 20], // 0001000xx
- [8, 33], [8, 33], // 00010010x
- [8, 34], [8, 34], // 00010011x
- [8, 35], [8, 35], // 00010100x
- [8, 36], [8, 36], // 00010101x
- [8, 37], [8, 37], // 00010110x
- [8, 38], [8, 38], // 00010111x
- [7, 19], [7, 19], [7, 19], [7, 19], // 0001100xx
- [8, 31], [8, 31], // 00011010x
- [8, 32], [8, 32], // 00011011x
- [6, 1], [6, 1], [6, 1], [6, 1], // 000111xxx
- [6, 1], [6, 1], [6, 1], [6, 1],
- [6, 12], [6, 12], [6, 12], [6, 12], // 001000xxx
- [6, 12], [6, 12], [6, 12], [6, 12],
- [8, 53], [8, 53], // 00100100x
- [8, 54], [8, 54], // 00100101x
- [7, 26], [7, 26], [7, 26], [7, 26], // 0010011xx
- [8, 39], [8, 39], // 00101000x
- [8, 40], [8, 40], // 00101001x
- [8, 41], [8, 41], // 00101010x
- [8, 42], [8, 42], // 00101011x
- [8, 43], [8, 43], // 00101100x
- [8, 44], [8, 44], // 00101101x
- [7, 21], [7, 21], [7, 21], [7, 21], // 0010111xx
- [7, 28], [7, 28], [7, 28], [7, 28], // 0011000xx
- [8, 61], [8, 61], // 00110010x
- [8, 62], [8, 62], // 00110011x
- [8, 63], [8, 63], // 00110100x
- [8, 0], [8, 0], // 00110101x
- [8, 320], [8, 320], // 00110110x
- [8, 384], [8, 384], // 00110111x
- [5, 10], [5, 10], [5, 10], [5, 10], // 00111xxxx
- [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], // 01000xxxx
- [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], // 0100100xx
- [8, 59], [8, 59], // 01001010x
- [8, 60], [8, 60], // 01001011x
- [9, 1472], // 010011000
- [9, 1536], // 010011001
- [9, 1600], // 010011010
- [9, 1728], // 010011011
- [7, 18], [7, 18], [7, 18], [7, 18], // 0100111xx
- [7, 24], [7, 24], [7, 24], [7, 24], // 0101000xx
- [8, 49], [8, 49], // 01010010x
- [8, 50], [8, 50], // 01010011x
- [8, 51], [8, 51], // 01010100x
- [8, 52], [8, 52], // 01010101x
- [7, 25], [7, 25], [7, 25], [7, 25], // 0101011xx
- [8, 55], [8, 55], // 01011000x
- [8, 56], [8, 56], // 01011001x
- [8, 57], [8, 57], // 01011010x
- [8, 58], [8, 58], // 01011011x
- [6, 192], [6, 192], [6, 192], [6, 192], // 010111xxx
- [6, 192], [6, 192], [6, 192], [6, 192],
- [6, 1664], [6, 1664], [6, 1664], [6, 1664], // 011000xxx
- [6, 1664], [6, 1664], [6, 1664], [6, 1664],
- [8, 448], [8, 448], // 01100100x
- [8, 512], [8, 512], // 01100101x
- [9, 704], // 011001100
- [9, 768], // 011001101
- [8, 640], [8, 640], // 01100111x
- [8, 576], [8, 576], // 01101000x
- [9, 832], // 011010010
- [9, 896], // 011010011
- [9, 960], // 011010100
- [9, 1024], // 011010101
- [9, 1088], // 011010110
- [9, 1152], // 011010111
- [9, 1216], // 011011000
- [9, 1280], // 011011001
- [9, 1344], // 011011010
- [9, 1408], // 011011011
- [7, 256], [7, 256], [7, 256], [7, 256], // 0110111xx
- [4, 2], [4, 2], [4, 2], [4, 2], // 0111xxxxx
- [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], // 1000xxxxx
- [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], // 10010xxxx
- [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], // 10011xxxx
- [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], // 10100xxxx
- [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], // 101010xxx
- [6, 16], [6, 16], [6, 16], [6, 16],
- [6, 17], [6, 17], [6, 17], [6, 17], // 101011xxx
- [6, 17], [6, 17], [6, 17], [6, 17],
- [4, 4], [4, 4], [4, 4], [4, 4], // 1011xxxxx
- [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], // 1100xxxxx
- [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], // 110100xxx
- [6, 14], [6, 14], [6, 14], [6, 14],
- [6, 15], [6, 15], [6, 15], [6, 15], // 110101xxx
- [6, 15], [6, 15], [6, 15], [6, 15],
- [5, 64], [5, 64], [5, 64], [5, 64], // 11011xxxx
- [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], // 1110xxxxx
- [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], // 1111xxxxx
- [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], // 000000000000x
- [12, ccittEOL], [12, ccittEOL], // 000000000001x
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000001xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000010xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000011xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000100xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000101xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000110xx
- [-1, -1], [-1, -1], [-1, -1], [-1, -1], // 00000000111xx
- [11, 1792], [11, 1792], [11, 1792], [11, 1792], // 00000001000xx
- [12, 1984], [12, 1984], // 000000010010x
- [12, 2048], [12, 2048], // 000000010011x
- [12, 2112], [12, 2112], // 000000010100x
- [12, 2176], [12, 2176], // 000000010101x
- [12, 2240], [12, 2240], // 000000010110x
- [12, 2304], [12, 2304], // 000000010111x
- [11, 1856], [11, 1856], [11, 1856], [11, 1856], // 00000001100xx
- [11, 1920], [11, 1920], [11, 1920], [11, 1920], // 00000001101xx
- [12, 2368], [12, 2368], // 000000011100x
- [12, 2432], [12, 2432], // 000000011101x
- [12, 2496], [12, 2496], // 000000011110x
- [12, 2560], [12, 2560], // 000000011111x
- [10, 18], [10, 18], [10, 18], [10, 18], // 0000001000xxx
- [10, 18], [10, 18], [10, 18], [10, 18],
- [12, 52], [12, 52], // 000000100100x
- [13, 640], // 0000001001010
- [13, 704], // 0000001001011
- [13, 768], // 0000001001100
- [13, 832], // 0000001001101
- [12, 55], [12, 55], // 000000100111x
- [12, 56], [12, 56], // 000000101000x
- [13, 1280], // 0000001010010
- [13, 1344], // 0000001010011
- [13, 1408], // 0000001010100
- [13, 1472], // 0000001010101
- [12, 59], [12, 59], // 000000101011x
- [12, 60], [12, 60], // 000000101100x
- [13, 1536], // 0000001011010
- [13, 1600], // 0000001011011
- [11, 24], [11, 24], [11, 24], [11, 24], // 00000010111xx
- [11, 25], [11, 25], [11, 25], [11, 25], // 00000011000xx
- [13, 1664], // 0000001100100
- [13, 1728], // 0000001100101
- [12, 320], [12, 320], // 000000110011x
- [12, 384], [12, 384], // 000000110100x
- [12, 448], [12, 448], // 000000110101x
- [13, 512], // 0000001101100
- [13, 576], // 0000001101101
- [12, 53], [12, 53], // 000000110111x
- [12, 54], [12, 54], // 000000111000x
- [13, 896], // 0000001110010
- [13, 960], // 0000001110011
- [13, 1024], // 0000001110100
- [13, 1088], // 0000001110101
- [13, 1152], // 0000001110110
- [13, 1216], // 0000001110111
- [10, 64], [10, 64], [10, 64], [10, 64], // 0000001111xxx
- [10, 64], [10, 64], [10, 64], [10, 64]
- ];
-
- var blackTable2 = [
- [8, 13], [8, 13], [8, 13], [8, 13], // 00000100xxxx
- [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], // 00000101000x
- [12, 50], // 000001010010
- [12, 51], // 000001010011
- [12, 44], // 000001010100
- [12, 45], // 000001010101
- [12, 46], // 000001010110
- [12, 47], // 000001010111
- [12, 57], // 000001011000
- [12, 58], // 000001011001
- [12, 61], // 000001011010
- [12, 256], // 000001011011
- [10, 16], [10, 16], [10, 16], [10, 16], // 0000010111xx
- [10, 17], [10, 17], [10, 17], [10, 17], // 0000011000xx
- [12, 48], // 000001100100
- [12, 49], // 000001100101
- [12, 62], // 000001100110
- [12, 63], // 000001100111
- [12, 30], // 000001101000
- [12, 31], // 000001101001
- [12, 32], // 000001101010
- [12, 33], // 000001101011
- [12, 40], // 000001101100
- [12, 41], // 000001101101
- [11, 22], [11, 22], // 00000110111x
- [8, 14], [8, 14], [8, 14], [8, 14], // 00000111xxxx
- [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], // 0000100xxxxx
- [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], // 0000101xxxxx
- [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], // 000011000xxx
- [9, 15], [9, 15], [9, 15], [9, 15],
- [12, 128], // 000011001000
- [12, 192], // 000011001001
- [12, 26], // 000011001010
- [12, 27], // 000011001011
- [12, 28], // 000011001100
- [12, 29], // 000011001101
- [11, 19], [11, 19], // 00001100111x
- [11, 20], [11, 20], // 00001101000x
- [12, 34], // 000011010010
- [12, 35], // 000011010011
- [12, 36], // 000011010100
- [12, 37], // 000011010101
- [12, 38], // 000011010110
- [12, 39], // 000011010111
- [11, 21], [11, 21], // 00001101100x
- [12, 42], // 000011011010
- [12, 43], // 000011011011
- [10, 0], [10, 0], [10, 0], [10, 0], // 0000110111xx
- [7, 12], [7, 12], [7, 12], [7, 12], // 0000111xxxxx
- [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], // 0000xx
- [6, 9], // 000100
- [6, 8], // 000101
- [5, 7], [5, 7], // 00011x
- [4, 6], [4, 6], [4, 6], [4, 6], // 0010xx
- [4, 5], [4, 5], [4, 5], [4, 5], // 0011xx
- [3, 1], [3, 1], [3, 1], [3, 1], // 010xxx
- [3, 1], [3, 1], [3, 1], [3, 1],
- [3, 4], [3, 4], [3, 4], [3, 4], // 011xxx
- [3, 4], [3, 4], [3, 4], [3, 4],
- [2, 3], [2, 3], [2, 3], [2, 3], // 10xxxx
- [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], // 11xxxx
- [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, params) {
- this.str = str;
- this.dict = str.dict;
-
- params = params || new Dict();
-
- 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 = 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;
- this.buf = EOF;
-
- 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);
- }
-
- CCITTFaxStream.prototype = Object.create(DecodeStream.prototype);
-
- CCITTFaxStream.prototype.readBlock = function CCITTFaxStream_readBlock() {
- while (!this.eof) {
- var c = this.lookChar();
- this.buf = EOF;
- 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) {
- warn('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) {
- warn('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) {
- warn('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() {
- if (this.buf != EOF)
- return this.buf;
-
- var refLine = this.refLine;
- var codingLine = this.codingLine;
- var columns = this.columns;
-
- var refPos, blackPixels, bits;
-
- if (this.outputBits == 0) {
- if (this.eof)
- return null;
-
- this.err = false;
-
- var code1, code2, code3;
- if (this.nextLine2D) {
- for (var 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 EOF:
- this.addPixels(columns, 0);
- this.eof = true;
- break;
- default:
- warn('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;
- }
- }
-
- if (this.byteAlign)
- this.inputBits &= ~7;
-
- var gotEOL = false;
-
- if (!this.eoblock && this.row == this.rows - 1) {
- this.eof = true;
- } else {
- code1 = this.lookBits(12);
- while (code1 == 0) {
- this.eatBits(1);
- code1 = this.lookBits(12);
- }
- if (code1 == 1) {
- this.eatBits(12);
- gotEOL = true;
- } else if (code1 == EOF) {
- this.eof = true;
- }
- }
-
- if (!this.eof && this.encoding > 0) {
- this.nextLine2D = !this.lookBits(1);
- this.eatBits(1);
- }
-
- if (this.eoblock && gotEOL) {
- 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 (var i = 0; i < 4; ++i) {
- code1 = this.lookBits(12);
- if (code1 != 1)
- warn('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 == EOF) {
- 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++;
- }
-
- if (this.outputBits >= 8) {
- this.buf = (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 {
- var bits = 8;
- this.buf = 0;
- do {
- if (this.outputBits > bits) {
- this.buf <<= bits;
- if (!(this.codingPos & 1)) {
- this.buf |= 0xFF >> (8 - bits);
- }
- this.outputBits -= bits;
- bits = 0;
- } else {
- this.buf <<= this.outputBits;
- if (!(this.codingPos & 1)) {
- this.buf |= 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) {
- this.buf <<= bits;
- bits = 0;
- }
- }
- } while (bits);
- }
- if (this.black) {
- this.buf ^= 0xFF;
- }
- return this.buf;
- };
-
- // This functions returns the code found from the table.
- // The start and end parameters set the boundaries for searching the table.
- // The limit parameter is optional. Function returns an array with three
- // values. The first array element indicates whether a valid code is being
- // returned. The second array element is the actual code. The third array
- // element indicates whether EOF was reached.
- 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 == EOF)
- 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];
- }
- warn('Bad two dim code');
- return EOF;
- };
-
- CCITTFaxStream.prototype.getWhiteCode =
- function ccittFaxStreamGetWhiteCode() {
-
- var code = 0;
- var p;
- var n;
- if (this.eoblock) {
- code = this.lookBits(12);
- if (code == EOF)
- 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];
- }
- warn('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 == EOF)
- 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];
- }
- warn('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()) == null) {
- if (this.inputBits == 0)
- return EOF;
- 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, 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);
- }
-
- 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 == null) {
- 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; // eof was found
-
- 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;
-})();
-
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-29 14:27:23 +0000