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1x | /* 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';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.LZWStream = exports.StringStream = exports.StreamsSequenceStream = exports.Stream = exports.RunLengthStream = exports.PredictorStream = exports.NullStream = exports.FlateStream = exports.DecodeStream = exports.DecryptStream = exports.AsciiHexStream = exports.Ascii85Stream = undefined;
var _util = require('../shared/util');
var _primitives = require('./primitives');
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();
Iif (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) {
Iif (!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 bytes = (0, _util.stringToBytes)(str);
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;
Iif (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) {
Iif (!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.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();
Iif (cmf === -1 || flg === -1) {
throw new _util.FormatError('Invalid header in flate stream: ' + cmf + ', ' + flg);
}
Iif ((cmf & 0x0f) !== 0x08) {
throw new _util.FormatError('Unknown compression method in flate stream: ' + cmf + ', ' + flg);
}
Iif (((cmf << 8) + flg) % 31 !== 0) {
throw new _util.FormatError('Bad FCHECK in flate stream: ' + cmf + ', ' + flg);
}
Iif (flg & 0x20) {
throw new _util.FormatError('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) {
Iif ((b = str.getByte()) === -1) {
throw new _util.FormatError('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) {
Iif ((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;
Iif (codeLen < 1 || codeSize < codeLen) {
throw new _util.FormatError('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;
Iif (hdr === 0) {
var b;
if ((b = str.getByte()) === -1) {
throw new _util.FormatError('Bad block header in flate stream');
}
var blockLen = b;
if ((b = str.getByte()) === -1) {
throw new _util.FormatError('Bad block header in flate stream');
}
blockLen |= b << 8;
if ((b = str.getByte()) === -1) {
throw new _util.FormatError('Bad block header in flate stream');
}
var check = b;
if ((b = str.getByte()) === -1) {
throw new _util.FormatError('Bad block header in flate stream');
}
check |= b << 8;
if (check !== (~blockLen & 0xffff) && (blockLen !== 0 || check !== 0)) {
throw new _util.FormatError('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 Eif (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 {
throw new _util.FormatError('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) {
Iif (!(0, _primitives.isDict)(params)) {
return str;
}
var predictor = this.predictor = params.get('Predictor') || 1;
Iif (predictor <= 1) {
return str;
}
Iif (predictor !== 2 && (predictor < 10 || predictor > 15)) {
throw new _util.FormatError('Unsupported predictor: ' + predictor);
}
Iif (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 if (bits === 16) {
var bytesPerPixel = colors * 2;
for (i = 0; i < bytesPerPixel; ++i) {
buffer[pos++] = rawBytes[i];
}
for (; i < rowBytes; i += 2) {
var sum = ((rawBytes[i] & 0xFF) << 8) + (rawBytes[i + 1] & 0xFF) + ((buffer[pos - bytesPerPixel] & 0xFF) << 8) + (buffer[pos - bytesPerPixel + 1] & 0xFF);
buffer[pos++] = sum >> 8 & 0xFF;
buffer[pos++] = sum & 0xFF;
}
} 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;
Iif (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:
throw new _util.FormatError('Unsupported predictor: ' + predictor);
}
this.bufferLength += rowBytes;
};
return PredictorStream;
}();
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 ((0, _util.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 ((0, _util.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;
Eif (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 Iif (ch === 0x3E) {
this.eof = true;
break;
} else {
continue;
}
if (firstDigit < 0) {
firstDigit = digit;
} else {
buffer[bufferLength++] = firstDigit << 4 | digit;
firstDigit = -1;
}
}
Iif (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 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.DecryptStream = DecryptStream;
exports.DecodeStream = DecodeStream;
exports.FlateStream = FlateStream;
exports.NullStream = NullStream;
exports.PredictorStream = PredictorStream;
exports.RunLengthStream = RunLengthStream;
exports.Stream = Stream;
exports.StreamsSequenceStream = StreamsSequenceStream;
exports.StringStream = StringStream;
exports.LZWStream = LZWStream; |