topical media & game development
mobile-query-three-vendor-three.js-loaders-ctm-lzma.js / js
var LZMA = LZMA || {};
LZMA.OutWindow = function(){
this._windowSize = 0;
};
LZMA.OutWindow.prototype.create = function(windowSize){
if ( (!this._buffer) || (this._windowSize !== windowSize) ){
this._buffer = [];
}
this._windowSize = windowSize;
this._pos = 0;
this._streamPos = 0;
};
LZMA.OutWindow.prototype.flush = function(){
var size = this._pos - this._streamPos;
if (size !== 0){
while(size --){
this._stream.writeByte(this._buffer[this._streamPos ++]);
}
if (this._pos >= this._windowSize){
this._pos = 0;
}
this._streamPos = this._pos;
}
};
LZMA.OutWindow.prototype.releaseStream = function(){
this.flush();
this._stream = null;
};
LZMA.OutWindow.prototype.setStream = function(stream){
this.releaseStream();
this._stream = stream;
};
LZMA.OutWindow.prototype.init = function(solid){
if (!solid){
this._streamPos = 0;
this._pos = 0;
}
};
LZMA.OutWindow.prototype.copyBlock = function(distance, len){
var pos = this._pos - distance - 1;
if (pos < 0){
pos += this._windowSize;
}
while(len --){
if (pos >= this._windowSize){
pos = 0;
}
this._buffer[this._pos ++] = this._buffer[pos ++];
if (this._pos >= this._windowSize){
this.flush();
}
}
};
LZMA.OutWindow.prototype.putByte = function(b){
this._buffer[this._pos ++] = b;
if (this._pos >= this._windowSize){
this.flush();
}
};
LZMA.OutWindow.prototype.getByte = function(distance){
var pos = this._pos - distance - 1;
if (pos < 0){
pos += this._windowSize;
}
return this._buffer[pos];
};
LZMA.RangeDecoder = function(){
};
LZMA.RangeDecoder.prototype.setStream = function(stream){
this._stream = stream;
};
LZMA.RangeDecoder.prototype.releaseStream = function(){
this._stream = null;
};
LZMA.RangeDecoder.prototype.init = function(){
var i = 5;
this._code = 0;
this._range = -1;
while(i --){
this._code = (this._code << 8) | this._stream.readByte();
}
};
LZMA.RangeDecoder.prototype.decodeDirectBits = function(numTotalBits){
var result = 0, i = numTotalBits, t;
while(i --){
this._range >>>= 1;
t = (this._code - this._range) >>> 31;
this._code -= this._range & (t - 1);
result = (result << 1) | (1 - t);
if ( (this._range & 0xff000000) === 0){
this._code = (this._code << 8) | this._stream.readByte();
this._range <<= 8;
}
}
return result;
};
LZMA.RangeDecoder.prototype.decodeBit = function(probs, index){
var prob = probs[index],
newBound = (this._range >>> 11) * prob;
if ( (this._code ^ 0x80000000) < (newBound ^ 0x80000000) ){
this._range = newBound;
probs[index] += (2048 - prob) >>> 5;
if ( (this._range & 0xff000000) === 0){
this._code = (this._code << 8) | this._stream.readByte();
this._range <<= 8;
}
return 0;
}
this._range -= newBound;
this._code -= newBound;
probs[index] -= prob >>> 5;
if ( (this._range & 0xff000000) === 0){
this._code = (this._code << 8) | this._stream.readByte();
this._range <<= 8;
}
return 1;
};
LZMA.initBitModels = function(probs, len){
while(len --){
probs[len] = 1024;
}
};
LZMA.BitTreeDecoder = function(numBitLevels){
this._models = [];
this._numBitLevels = numBitLevels;
};
LZMA.BitTreeDecoder.prototype.init = function(){
LZMA.initBitModels(this._models, 1 << this._numBitLevels);
};
LZMA.BitTreeDecoder.prototype.decode = function(rangeDecoder){
var m = 1, i = this._numBitLevels;
while(i --){
m = (m << 1) | rangeDecoder.decodeBit(this._models, m);
}
return m - (1 << this._numBitLevels);
};
LZMA.BitTreeDecoder.prototype.reverseDecode = function(rangeDecoder){
var m = 1, symbol = 0, i = 0, bit;
for (; i < this._numBitLevels; ++ i){
bit = rangeDecoder.decodeBit(this._models, m);
m = (m << 1) | bit;
symbol |= bit << i;
}
return symbol;
};
LZMA.reverseDecode2 = function(models, startIndex, rangeDecoder, numBitLevels){
var m = 1, symbol = 0, i = 0, bit;
for (; i < numBitLevels; ++ i){
bit = rangeDecoder.decodeBit(models, startIndex + m);
m = (m << 1) | bit;
symbol |= bit << i;
}
return symbol;
};
LZMA.LenDecoder = function(){
this._choice = [];
this._lowCoder = [];
this._midCoder = [];
this._highCoder = new LZMA.BitTreeDecoder(8);
this._numPosStates = 0;
};
LZMA.LenDecoder.prototype.create = function(numPosStates){
for (; this._numPosStates < numPosStates; ++ this._numPosStates){
this._lowCoder[this._numPosStates] = new LZMA.BitTreeDecoder(3);
this._midCoder[this._numPosStates] = new LZMA.BitTreeDecoder(3);
}
};
LZMA.LenDecoder.prototype.init = function(){
var i = this._numPosStates;
LZMA.initBitModels(this._choice, 2);
while(i --){
this._lowCoder[i].init();
this._midCoder[i].init();
}
this._highCoder.init();
};
LZMA.LenDecoder.prototype.decode = function(rangeDecoder, posState){
if (rangeDecoder.decodeBit(this._choice, 0) === 0){
return this._lowCoder[posState].decode(rangeDecoder);
}
if (rangeDecoder.decodeBit(this._choice, 1) === 0){
return 8 + this._midCoder[posState].decode(rangeDecoder);
}
return 16 + this._highCoder.decode(rangeDecoder);
};
LZMA.Decoder2 = function(){
this._decoders = [];
};
LZMA.Decoder2.prototype.init = function(){
LZMA.initBitModels(this._decoders, 0x300);
};
LZMA.Decoder2.prototype.decodeNormal = function(rangeDecoder){
var symbol = 1;
do{
symbol = (symbol << 1) | rangeDecoder.decodeBit(this._decoders, symbol);
}while(symbol < 0x100);
return symbol & 0xff;
};
LZMA.Decoder2.prototype.decodeWithMatchByte = function(rangeDecoder, matchByte){
var symbol = 1, matchBit, bit;
do{
matchBit = (matchByte >> 7) & 1;
matchByte <<= 1;
bit = rangeDecoder.decodeBit(this._decoders, ( (1 + matchBit) << 8) + symbol);
symbol = (symbol << 1) | bit;
if (matchBit !== bit){
while(symbol < 0x100){
symbol = (symbol << 1) | rangeDecoder.decodeBit(this._decoders, symbol);
}
break;
}
}while(symbol < 0x100);
return symbol & 0xff;
};
LZMA.LiteralDecoder = function(){
};
LZMA.LiteralDecoder.prototype.create = function(numPosBits, numPrevBits){
var i;
if (this._coders
&& (this._numPrevBits === numPrevBits)
&& (this._numPosBits === numPosBits) ){
return;
}
this._numPosBits = numPosBits;
this._posMask = (1 << numPosBits) - 1;
this._numPrevBits = numPrevBits;
this._coders = [];
i = 1 << (this._numPrevBits + this._numPosBits);
while(i --){
this._coders[i] = new LZMA.Decoder2();
}
};
LZMA.LiteralDecoder.prototype.init = function(){
var i = 1 << (this._numPrevBits + this._numPosBits);
while(i --){
this._coders[i].init();
}
};
LZMA.LiteralDecoder.prototype.getDecoder = function(pos, prevByte){
return this._coders[( (pos & this._posMask) << this._numPrevBits)
+ ( (prevByte & 0xff) >>> (8 - this._numPrevBits) )];
};
LZMA.Decoder = function(){
this._outWindow = new LZMA.OutWindow();
this._rangeDecoder = new LZMA.RangeDecoder();
this._isMatchDecoders = [];
this._isRepDecoders = [];
this._isRepG0Decoders = [];
this._isRepG1Decoders = [];
this._isRepG2Decoders = [];
this._isRep0LongDecoders = [];
this._posSlotDecoder = [];
this._posDecoders = [];
this._posAlignDecoder = new LZMA.BitTreeDecoder(4);
this._lenDecoder = new LZMA.LenDecoder();
this._repLenDecoder = new LZMA.LenDecoder();
this._literalDecoder = new LZMA.LiteralDecoder();
this._dictionarySize = -1;
this._dictionarySizeCheck = -1;
this._posSlotDecoder[0] = new LZMA.BitTreeDecoder(6);
this._posSlotDecoder[1] = new LZMA.BitTreeDecoder(6);
this._posSlotDecoder[2] = new LZMA.BitTreeDecoder(6);
this._posSlotDecoder[3] = new LZMA.BitTreeDecoder(6);
};
LZMA.Decoder.prototype.setDictionarySize = function(dictionarySize){
if (dictionarySize < 0){
return false;
}
if (this._dictionarySize !== dictionarySize){
this._dictionarySize = dictionarySize;
this._dictionarySizeCheck = Math.max(this._dictionarySize, 1);
this._outWindow.create( Math.max(this._dictionarySizeCheck, 4096) );
}
return true;
};
LZMA.Decoder.prototype.setLcLpPb = function(lc, lp, pb){
var numPosStates = 1 << pb;
if (lc > 8 || lp > 4 || pb > 4){
return false;
}
this._literalDecoder.create(lp, lc);
this._lenDecoder.create(numPosStates);
this._repLenDecoder.create(numPosStates);
this._posStateMask = numPosStates - 1;
return true;
};
LZMA.Decoder.prototype.init = function(){
var i = 4;
this._outWindow.init(false);
LZMA.initBitModels(this._isMatchDecoders, 192);
LZMA.initBitModels(this._isRep0LongDecoders, 192);
LZMA.initBitModels(this._isRepDecoders, 12);
LZMA.initBitModels(this._isRepG0Decoders, 12);
LZMA.initBitModels(this._isRepG1Decoders, 12);
LZMA.initBitModels(this._isRepG2Decoders, 12);
LZMA.initBitModels(this._posDecoders, 114);
this._literalDecoder.init();
while(i --){
this._posSlotDecoder[i].init();
}
this._lenDecoder.init();
this._repLenDecoder.init();
this._posAlignDecoder.init();
this._rangeDecoder.init();
};
LZMA.Decoder.prototype.decode = function(inStream, outStream, outSize){
var state = 0, rep0 = 0, rep1 = 0, rep2 = 0, rep3 = 0, nowPos64 = 0, prevByte = 0,
posState, decoder2, len, distance, posSlot, numDirectBits;
this._rangeDecoder.setStream(inStream);
this._outWindow.setStream(outStream);
this.init();
while(outSize < 0 || nowPos64 < outSize){
posState = nowPos64 & this._posStateMask;
if (this._rangeDecoder.decodeBit(this._isMatchDecoders, (state << 4) + posState) === 0){
decoder2 = this._literalDecoder.getDecoder(nowPos64 ++, prevByte);
if (state >= 7){
prevByte = decoder2.decodeWithMatchByte(this._rangeDecoder, this._outWindow.getByte(rep0) );
}else{
prevByte = decoder2.decodeNormal(this._rangeDecoder);
}
this._outWindow.putByte(prevByte);
state = state < 4? 0: state - (state < 10? 3: 6);
}else{
if (this._rangeDecoder.decodeBit(this._isRepDecoders, state) === 1){
len = 0;
if (this._rangeDecoder.decodeBit(this._isRepG0Decoders, state) === 0){
if (this._rangeDecoder.decodeBit(this._isRep0LongDecoders, (state << 4) + posState) === 0){
state = state < 7? 9: 11;
len = 1;
}
}else{
if (this._rangeDecoder.decodeBit(this._isRepG1Decoders, state) === 0){
distance = rep1;
}else{
if (this._rangeDecoder.decodeBit(this._isRepG2Decoders, state) === 0){
distance = rep2;
}else{
distance = rep3;
rep3 = rep2;
}
rep2 = rep1;
}
rep1 = rep0;
rep0 = distance;
}
if (len === 0){
len = 2 + this._repLenDecoder.decode(this._rangeDecoder, posState);
state = state < 7? 8: 11;
}
}else{
rep3 = rep2;
rep2 = rep1;
rep1 = rep0;
len = 2 + this._lenDecoder.decode(this._rangeDecoder, posState);
state = state < 7? 7: 10;
posSlot = this._posSlotDecoder[len <= 5? len - 2: 3].decode(this._rangeDecoder);
if (posSlot >= 4){
numDirectBits = (posSlot >> 1) - 1;
rep0 = (2 | (posSlot & 1) ) << numDirectBits;
if (posSlot < 14){
rep0 += LZMA.reverseDecode2(this._posDecoders,
rep0 - posSlot - 1, this._rangeDecoder, numDirectBits);
}else{
rep0 += this._rangeDecoder.decodeDirectBits(numDirectBits - 4) << 4;
rep0 += this._posAlignDecoder.reverseDecode(this._rangeDecoder);
if (rep0 < 0){
if (rep0 === -1){
break;
}
return false;
}
}
}else{
rep0 = posSlot;
}
}
if (rep0 >= nowPos64 || rep0 >= this._dictionarySizeCheck){
return false;
}
this._outWindow.copyBlock(rep0, len);
nowPos64 += len;
prevByte = this._outWindow.getByte(0);
}
}
this._outWindow.flush();
this._outWindow.releaseStream();
this._rangeDecoder.releaseStream();
return true;
};
LZMA.Decoder.prototype.setDecoderProperties = function(properties){
var value, lc, lp, pb, dictionarySize;
if (properties.size < 5){
return false;
}
value = properties.readByte();
lc = value % 9;
value = ~~(value / 9);
lp = value % 5;
pb = ~~(value / 5);
if ( !this.setLcLpPb(lc, lp, pb) ){
return false;
}
dictionarySize = properties.readByte();
dictionarySize |= properties.readByte() << 8;
dictionarySize |= properties.readByte() << 16;
dictionarySize += properties.readByte() * 16777216;
return this.setDictionarySize(dictionarySize);
};
LZMA.decompress = function(properties, inStream, outStream, outSize){
var decoder = new LZMA.Decoder();
if ( !decoder.setDecoderProperties(properties) ){
throw "Incorrect stream properties";
}
if ( !decoder.decode(inStream, outStream, outSize) ){
throw "Error in data stream";
}
return true;
};
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.