openmedialibrary_reader/cbr.js/bitjs/unrar.js

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2015-03-14 07:30:38 +00:00
/**
* unrar.js
*
* Copyright(c) 2011 Google Inc.
* Copyright(c) 2011 antimatter15
*
* Reference Documentation:
*
* http://kthoom.googlecode.com/hg/docs/unrar.html
*/
// This file expects to be invoked as a Worker (see onmessage below).
importScripts('io.js');
importScripts('archive.js');
// Progress variables.
var currentFilename = "";
var currentFileNumber = 0;
var currentBytesUnarchivedInFile = 0;
var currentBytesUnarchived = 0;
var totalUncompressedBytesInArchive = 0;
var totalFilesInArchive = 0;
// Helper functions.
var info = function(str) {
postMessage(new bitjs.archive.UnarchiveInfoEvent(str));
};
var err = function(str) {
postMessage(new bitjs.archive.UnarchiveErrorEvent(str));
};
var postProgress = function() {
postMessage(new bitjs.archive.UnarchiveProgressEvent(
currentFilename,
currentFileNumber,
currentBytesUnarchivedInFile,
currentBytesUnarchived,
totalUncompressedBytesInArchive,
totalFilesInArchive));
};
// shows a byte value as its hex representation
var nibble = "0123456789ABCDEF";
var byteValueToHexString = function(num) {
return nibble[num>>4] + nibble[num&0xF];
};
var twoByteValueToHexString = function(num) {
return nibble[(num>>12)&0xF] + nibble[(num>>8)&0xF] + nibble[(num>>4)&0xF] + nibble[num&0xF];
};
// Volume Types
var MARK_HEAD = 0x72,
MAIN_HEAD = 0x73,
FILE_HEAD = 0x74,
COMM_HEAD = 0x75,
AV_HEAD = 0x76,
SUB_HEAD = 0x77,
PROTECT_HEAD = 0x78,
SIGN_HEAD = 0x79,
NEWSUB_HEAD = 0x7a,
ENDARC_HEAD = 0x7b;
// bstream is a bit stream
var RarVolumeHeader = function(bstream) {
var headPos = bstream.bytePtr;
// byte 1,2
info("Rar Volume Header @"+bstream.bytePtr);
this.crc = bstream.readBits(16);
info(" crc=" + this.crc);
// byte 3
this.headType = bstream.readBits(8);
info(" headType=" + this.headType);
// Get flags
// bytes 4,5
this.flags = {};
this.flags.value = bstream.peekBits(16);
info(" flags=" + twoByteValueToHexString(this.flags.value));
switch (this.headType) {
case MAIN_HEAD:
this.flags.MHD_VOLUME = !!bstream.readBits(1);
this.flags.MHD_COMMENT = !!bstream.readBits(1);
this.flags.MHD_LOCK = !!bstream.readBits(1);
this.flags.MHD_SOLID = !!bstream.readBits(1);
this.flags.MHD_PACK_COMMENT = !!bstream.readBits(1);
this.flags.MHD_NEWNUMBERING = this.flags.MHD_PACK_COMMENT;
this.flags.MHD_AV = !!bstream.readBits(1);
this.flags.MHD_PROTECT = !!bstream.readBits(1);
this.flags.MHD_PASSWORD = !!bstream.readBits(1);
this.flags.MHD_FIRSTVOLUME = !!bstream.readBits(1);
this.flags.MHD_ENCRYPTVER = !!bstream.readBits(1);
bstream.readBits(6); // unused
break;
case FILE_HEAD:
this.flags.LHD_SPLIT_BEFORE = !!bstream.readBits(1); // 0x0001
this.flags.LHD_SPLIT_AFTER = !!bstream.readBits(1); // 0x0002
this.flags.LHD_PASSWORD = !!bstream.readBits(1); // 0x0004
this.flags.LHD_COMMENT = !!bstream.readBits(1); // 0x0008
this.flags.LHD_SOLID = !!bstream.readBits(1); // 0x0010
bstream.readBits(3); // unused
this.flags.LHD_LARGE = !!bstream.readBits(1); // 0x0100
this.flags.LHD_UNICODE = !!bstream.readBits(1); // 0x0200
this.flags.LHD_SALT = !!bstream.readBits(1); // 0x0400
this.flags.LHD_VERSION = !!bstream.readBits(1); // 0x0800
this.flags.LHD_EXTTIME = !!bstream.readBits(1); // 0x1000
this.flags.LHD_EXTFLAGS = !!bstream.readBits(1); // 0x2000
bstream.readBits(2); // unused
info(" LHD_SPLIT_BEFORE = " + this.flags.LHD_SPLIT_BEFORE);
break;
default:
bstream.readBits(16);
}
// byte 6,7
this.headSize = bstream.readBits(16);
info(" headSize=" + this.headSize);
switch (this.headType) {
case MAIN_HEAD:
this.highPosAv = bstream.readBits(16);
this.posAv = bstream.readBits(32);
if (this.flags.MHD_ENCRYPTVER) {
this.encryptVer = bstream.readBits(8);
}
info("Found MAIN_HEAD with highPosAv=" + this.highPosAv + ", posAv=" + this.posAv);
break;
case FILE_HEAD:
this.packSize = bstream.readBits(32);
this.unpackedSize = bstream.readBits(32);
this.hostOS = bstream.readBits(8);
this.fileCRC = bstream.readBits(32);
this.fileTime = bstream.readBits(32);
this.unpVer = bstream.readBits(8);
this.method = bstream.readBits(8);
this.nameSize = bstream.readBits(16);
this.fileAttr = bstream.readBits(32);
if (this.flags.LHD_LARGE) {
info("Warning: Reading in LHD_LARGE 64-bit size values");
this.HighPackSize = bstream.readBits(32);
this.HighUnpSize = bstream.readBits(32);
} else {
this.HighPackSize = 0;
this.HighUnpSize = 0;
if (this.unpackedSize == 0xffffffff) {
this.HighUnpSize = 0x7fffffff
this.unpackedSize = 0xffffffff;
}
}
this.fullPackSize = 0;
this.fullUnpackSize = 0;
this.fullPackSize |= this.HighPackSize;
this.fullPackSize <<= 32;
this.fullPackSize |= this.packSize;
// read in filename
this.filename = bstream.readBytes(this.nameSize);
for (var _i = 0, _s = ''; _i < this.filename.length; _i++) {
_s += String.fromCharCode(this.filename[_i]);
}
this.filename = _s;
if (this.flags.LHD_SALT) {
info("Warning: Reading in 64-bit salt value");
this.salt = bstream.readBits(64); // 8 bytes
}
if (this.flags.LHD_EXTTIME) {
// 16-bit flags
var extTimeFlags = bstream.readBits(16);
// this is adapted straight out of arcread.cpp, Archive::ReadHeader()
for (var I = 0; I < 4; ++I) {
var rmode = extTimeFlags >> ((3-I)*4);
if ((rmode & 8)==0)
continue;
if (I!=0)
bstream.readBits(16);
var count = (rmode&3);
for (var J = 0; J < count; ++J)
bstream.readBits(8);
}
}
if (this.flags.LHD_COMMENT) {
info("Found a LHD_COMMENT");
}
while(headPos + this.headSize > bstream.bytePtr) bstream.readBits(1);
info("Found FILE_HEAD with packSize=" + this.packSize + ", unpackedSize= " + this.unpackedSize + ", hostOS=" + this.hostOS + ", unpVer=" + this.unpVer + ", method=" + this.method + ", filename=" + this.filename);
break;
default:
info("Found a header of type 0x" + byteValueToHexString(this.headType));
// skip the rest of the header bytes (for now)
bstream.readBytes( this.headSize - 7 );
break;
}
};
var BLOCK_LZ = 0,
BLOCK_PPM = 1;
var rLDecode = [0,1,2,3,4,5,6,7,8,10,12,14,16,20,24,28,32,40,48,56,64,80,96,112,128,160,192,224],
rLBits = [0,0,0,0,0,0,0,0,1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5],
rDBitLengthCounts = [4,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,14,0,12],
rSDDecode = [0,4,8,16,32,64,128,192],
rSDBits = [2,2,3, 4, 5, 6, 6, 6];
var rDDecode = [0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32,
48, 64, 96, 128, 192, 256, 384, 512, 768, 1024, 1536, 2048, 3072,
4096, 6144, 8192, 12288, 16384, 24576, 32768, 49152, 65536, 98304,
131072, 196608, 262144, 327680, 393216, 458752, 524288, 589824,
655360, 720896, 786432, 851968, 917504, 983040];
var rDBits = [0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,
5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14,
15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16];
var rLOW_DIST_REP_COUNT = 16;
var rNC = 299,
rDC = 60,
rLDC = 17,
rRC = 28,
rBC = 20,
rHUFF_TABLE_SIZE = (rNC+rDC+rRC+rLDC);
var UnpBlockType = BLOCK_LZ;
var UnpOldTable = new Array(rHUFF_TABLE_SIZE);
var BD = { //bitdecode
DecodeLen: new Array(16),
DecodePos: new Array(16),
DecodeNum: new Array(rBC)
};
var LD = { //litdecode
DecodeLen: new Array(16),
DecodePos: new Array(16),
DecodeNum: new Array(rNC)
};
var DD = { //distdecode
DecodeLen: new Array(16),
DecodePos: new Array(16),
DecodeNum: new Array(rDC)
};
var LDD = { //low dist decode
DecodeLen: new Array(16),
DecodePos: new Array(16),
DecodeNum: new Array(rLDC)
};
var RD = { //rep decode
DecodeLen: new Array(16),
DecodePos: new Array(16),
DecodeNum: new Array(rRC)
};
var rBuffer;
// read in Huffman tables for RAR
function RarReadTables(bstream) {
var BitLength = new Array(rBC),
Table = new Array(rHUFF_TABLE_SIZE);
// before we start anything we need to get byte-aligned
bstream.readBits( (8 - bstream.bitPtr) & 0x7 );
if (bstream.readBits(1)) {
info("Error! PPM not implemented yet");
return;
}
if (!bstream.readBits(1)) { //discard old table
for (var i = UnpOldTable.length; i--;) UnpOldTable[i] = 0;
}
// read in bit lengths
for (var I = 0; I < rBC; ++I) {
var Length = bstream.readBits(4);
if (Length == 15) {
var ZeroCount = bstream.readBits(4);
if (ZeroCount == 0) {
BitLength[I] = 15;
}
else {
ZeroCount += 2;
while (ZeroCount-- > 0 && I < rBC)
BitLength[I++] = 0;
--I;
}
}
else {
BitLength[I] = Length;
}
}
// now all 20 bit lengths are obtained, we construct the Huffman Table:
RarMakeDecodeTables(BitLength, 0, BD, rBC);
var TableSize = rHUFF_TABLE_SIZE;
//console.log(DecodeLen, DecodePos, DecodeNum);
for (var i = 0; i < TableSize;) {
var num = RarDecodeNumber(bstream, BD);
if (num < 16) {
Table[i] = (num + UnpOldTable[i]) & 0xf;
i++;
} else if(num < 18) {
var N = (num == 16) ? (bstream.readBits(3) + 3) : (bstream.readBits(7) + 11);
while (N-- > 0 && i < TableSize) {
Table[i] = Table[i - 1];
i++;
}
} else {
var N = (num == 18) ? (bstream.readBits(3) + 3) : (bstream.readBits(7) + 11);
while (N-- > 0 && i < TableSize) {
Table[i++] = 0;
}
}
}
RarMakeDecodeTables(Table, 0, LD, rNC);
RarMakeDecodeTables(Table, rNC, DD, rDC);
RarMakeDecodeTables(Table, rNC + rDC, LDD, rLDC);
RarMakeDecodeTables(Table, rNC + rDC + rLDC, RD, rRC);
for (var i = UnpOldTable.length; i--;) {
UnpOldTable[i] = Table[i];
}
return true;
}
function RarDecodeNumber(bstream, dec) {
var DecodeLen = dec.DecodeLen, DecodePos = dec.DecodePos, DecodeNum = dec.DecodeNum;
var bitField = bstream.getBits() & 0xfffe;
//some sort of rolled out binary search
var bits = ((bitField < DecodeLen[8])?
((bitField < DecodeLen[4])?
((bitField < DecodeLen[2])?
((bitField < DecodeLen[1])?1:2)
:((bitField < DecodeLen[3])?3:4))
:(bitField < DecodeLen[6])?
((bitField < DecodeLen[5])?5:6)
:((bitField < DecodeLen[7])?7:8))
:((bitField < DecodeLen[12])?
((bitField < DecodeLen[10])?
((bitField < DecodeLen[9])?9:10)
:((bitField < DecodeLen[11])?11:12))
:(bitField < DecodeLen[14])?
((bitField < DecodeLen[13])?13:14)
:15));
bstream.readBits(bits);
var N = DecodePos[bits] + ((bitField - DecodeLen[bits -1]) >>> (16 - bits));
return DecodeNum[N];
}
function RarMakeDecodeTables(BitLength, offset, dec, size) {
var DecodeLen = dec.DecodeLen, DecodePos = dec.DecodePos, DecodeNum = dec.DecodeNum;
var LenCount = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
TmpPos = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
N = 0, M = 0;
for (var i = DecodeNum.length; i--;) DecodeNum[i] = 0;
for (var i = 0; i < size; i++) {
LenCount[BitLength[i + offset] & 0xF]++;
}
LenCount[0] = 0;
TmpPos[0] = 0;
DecodePos[0] = 0;
DecodeLen[0] = 0;
for (var I = 1; I < 16; ++I) {
N = 2 * (N+LenCount[I]);
M = (N << (15-I));
if (M > 0xFFFF)
M = 0xFFFF;
DecodeLen[I] = M;
DecodePos[I] = DecodePos[I-1] + LenCount[I-1];
TmpPos[I] = DecodePos[I];
}
for (I = 0; I < size; ++I)
if (BitLength[I + offset] != 0)
DecodeNum[ TmpPos[ BitLength[offset + I] & 0xF ]++] = I;
}
// TODO: implement
function Unpack15(bstream, Solid) {
info("ERROR! RAR 1.5 compression not supported");
}
function Unpack20(bstream, Solid) {
var destUnpSize = rBuffer.data.length;
var oldDistPtr = 0;
RarReadTables20(bstream);
while (destUnpSize > rBuffer.ptr) {
var num = RarDecodeNumber(bstream, LD);
if (num < 256) {
rBuffer.insertByte(num);
continue;
}
if (num > 269) {
var Length = rLDecode[num -= 270] + 3;
if ((Bits = rLBits[num]) > 0) {
Length += bstream.readBits(Bits);
}
var DistNumber = RarDecodeNumber(bstream, DD);
var Distance = rDDecode[DistNumber] + 1;
if ((Bits = rDBits[DistNumber]) > 0) {
Distance += bstream.readBits(Bits);
}
if (Distance >= 0x2000) {
Length++;
if(Distance >= 0x40000) Length++;
}
lastLength = Length;
lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
RarCopyString(Length, Distance);
continue;
}
if (num == 269) {
RarReadTables20(bstream);
RarUpdateProgress()
continue;
}
if (num == 256) {
lastDist = rOldDist[oldDistPtr++ & 3] = lastDist;
RarCopyString(lastLength, lastDist);
continue;
}
if (num < 261) {
var Distance = rOldDist[(oldDistPtr - (num - 256)) & 3];
var LengthNumber = RarDecodeNumber(bstream, RD);
var Length = rLDecode[LengthNumber] +2;
if ((Bits = rLBits[LengthNumber]) > 0) {
Length += bstream.readBits(Bits);
}
if (Distance >= 0x101) {
Length++;
if (Distance >= 0x2000) {
Length++
if (Distance >= 0x40000) Length++;
}
}
lastLength = Length;
lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
RarCopyString(Length, Distance);
continue;
}
if (num < 270) {
var Distance = rSDDecode[num -= 261] + 1;
if ((Bits = rSDBits[num]) > 0) {
Distance += bstream.readBits(Bits);
}
lastLength = 2;
lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
RarCopyString(2, Distance);
continue;
}
}
RarUpdateProgress()
}
function RarUpdateProgress() {
var change = rBuffer.ptr - currentBytesUnarchivedInFile;
currentBytesUnarchivedInFile = rBuffer.ptr;
currentBytesUnarchived += change;
postProgress();
}
var rNC20 = 298,
rDC20 = 48,
rRC20 = 28,
rBC20 = 19,
rMC20 = 257;
var UnpOldTable20 = new Array(rMC20 * 4);
function RarReadTables20(bstream) {
var BitLength = new Array(rBC20);
var Table = new Array(rMC20 * 4);
var TableSize, N, I;
var AudioBlock = bstream.readBits(1);
if (!bstream.readBits(1))
for (var i = UnpOldTable20.length; i--;) UnpOldTable20[i] = 0;
TableSize = rNC20 + rDC20 + rRC20;
for (var I = 0; I < rBC20; I++)
BitLength[I] = bstream.readBits(4);
RarMakeDecodeTables(BitLength, 0, BD, rBC20);
I = 0;
while (I < TableSize) {
var num = RarDecodeNumber(bstream, BD);
if (num < 16) {
Table[I] = num + UnpOldTable20[I] & 0xf;
I++;
} else if(num == 16) {
N = bstream.readBits(2) + 3;
while (N-- > 0 && I < TableSize) {
Table[I] = Table[I - 1];
I++;
}
} else {
if (num == 17) {
N = bstream.readBits(3) + 3;
} else {
N = bstream.readBits(7) + 11;
}
while (N-- > 0 && I < TableSize) {
Table[I++] = 0;
}
}
}
RarMakeDecodeTables(Table, 0, LD, rNC20);
RarMakeDecodeTables(Table, rNC20, DD, rDC20);
RarMakeDecodeTables(Table, rNC20 + rDC20, RD, rRC20);
for (var i = UnpOldTable20.length; i--;) UnpOldTable20[i] = Table[i];
}
var lowDistRepCount = 0, prevLowDist = 0;
var rOldDist = [0,0,0,0];
var lastDist;
var lastLength;
function Unpack29(bstream, Solid) {
// lazy initialize rDDecode and rDBits
var DDecode = new Array(rDC);
var DBits = new Array(rDC);
var Dist=0,BitLength=0,Slot=0;
for (var I = 0; I < rDBitLengthCounts.length; I++,BitLength++) {
for (var J = 0; J < rDBitLengthCounts[I]; J++,Slot++,Dist+=(1<<BitLength)) {
DDecode[Slot]=Dist;
DBits[Slot]=BitLength;
}
}
var Bits;
//tablesRead = false;
rOldDist = [0,0,0,0]
lastDist = 0;
lastLength = 0;
for (var i = UnpOldTable.length; i--;) UnpOldTable[i] = 0;
// read in Huffman tables
RarReadTables(bstream);
while (true) {
var num = RarDecodeNumber(bstream, LD);
if (num < 256) {
rBuffer.insertByte(num);
continue;
}
if (num >= 271) {
var Length = rLDecode[num -= 271] + 3;
if ((Bits = rLBits[num]) > 0) {
Length += bstream.readBits(Bits);
}
var DistNumber = RarDecodeNumber(bstream, DD);
var Distance = DDecode[DistNumber]+1;
if ((Bits = DBits[DistNumber]) > 0) {
if (DistNumber > 9) {
if (Bits > 4) {
Distance += ((bstream.getBits() >>> (20 - Bits)) << 4);
bstream.readBits(Bits - 4);
//todo: check this
}
if (lowDistRepCount > 0) {
lowDistRepCount--;
Distance += prevLowDist;
} else {
var LowDist = RarDecodeNumber(bstream, LDD);
if (LowDist == 16) {
lowDistRepCount = rLOW_DIST_REP_COUNT - 1;
Distance += prevLowDist;
} else {
Distance += LowDist;
prevLowDist = LowDist;
}
}
} else {
Distance += bstream.readBits(Bits);
}
}
if (Distance >= 0x2000) {
Length++;
if (Distance >= 0x40000) {
Length++;
}
}
RarInsertOldDist(Distance);
RarInsertLastMatch(Length, Distance);
RarCopyString(Length, Distance);
continue;
}
if (num == 256) {
if (!RarReadEndOfBlock(bstream)) break;
continue;
}
if (num == 257) {
//console.log("READVMCODE");
if (!RarReadVMCode(bstream)) break;
continue;
}
if (num == 258) {
if (lastLength != 0) {
RarCopyString(lastLength, lastDist);
}
continue;
}
if (num < 263) {
var DistNum = num - 259;
var Distance = rOldDist[DistNum];
for (var I = DistNum; I > 0; I--) {
rOldDist[I] = rOldDist[I-1];
}
rOldDist[0] = Distance;
var LengthNumber = RarDecodeNumber(bstream, RD);
var Length = rLDecode[LengthNumber] + 2;
if ((Bits = rLBits[LengthNumber]) > 0) {
Length += bstream.readBits(Bits);
}
RarInsertLastMatch(Length, Distance);
RarCopyString(Length, Distance);
continue;
}
if (num < 272) {
var Distance = rSDDecode[num -= 263] + 1;
if ((Bits = rSDBits[num]) > 0) {
Distance += bstream.readBits(Bits);
}
RarInsertOldDist(Distance);
RarInsertLastMatch(2, Distance);
RarCopyString(2, Distance);
continue;
}
}
RarUpdateProgress()
}
function RarReadEndOfBlock(bstream) {
RarUpdateProgress()
var NewTable = false, NewFile = false;
if (bstream.readBits(1)) {
NewTable = true;
} else {
NewFile = true;
NewTable = !!bstream.readBits(1);
}
//tablesRead = !NewTable;
return !(NewFile || NewTable && !RarReadTables(bstream));
}
function RarReadVMCode(bstream) {
var FirstByte = bstream.readBits(8);
var Length = (FirstByte & 7) + 1;
if (Length == 7) {
Length = bstream.readBits(8) + 7;
} else if(Length == 8) {
Length = bstream.readBits(16);
}
var vmCode = [];
for(var I = 0; I < Length; I++) {
//do something here with cheking readbuf
vmCode.push(bstream.readBits(8));
}
return RarAddVMCode(FirstByte, vmCode, Length);
}
function RarAddVMCode(firstByte, vmCode, length) {
//console.log(vmCode);
if (vmCode.length > 0) {
info("Error! RarVM not supported yet!");
}
return true;
}
function RarInsertLastMatch(length, distance) {
lastDist = distance;
lastLength = length;
}
function RarInsertOldDist(distance) {
rOldDist.splice(3,1);
rOldDist.splice(0,0,distance);
}
//this is the real function, the other one is for debugging
function RarCopyString(length, distance) {
var destPtr = rBuffer.ptr - distance;
if(destPtr < 0){
var l = rOldBuffers.length;
while(destPtr < 0){
destPtr = rOldBuffers[--l].data.length + destPtr;
}
//TODO: lets hope that it never needs to read beyond file boundaries
while(length--) rBuffer.insertByte(rOldBuffers[l].data[destPtr++]);
}
if (length > distance) {
while(length--) rBuffer.insertByte(rBuffer.data[destPtr++]);
} else {
rBuffer.insertBytes(rBuffer.data.subarray(destPtr, destPtr + length));
}
}
var rOldBuffers = []
// v must be a valid RarVolume
function unpack(v) {
// TODO: implement what happens when unpVer is < 15
var Ver = v.header.unpVer <= 15 ? 15 : v.header.unpVer,
Solid = v.header.LHD_SOLID,
bstream = new bitjs.io.BitStream(v.fileData.buffer, true /* rtl */, v.fileData.byteOffset, v.fileData.byteLength );
rBuffer = new bitjs.io.ByteBuffer(v.header.unpackedSize);
info("Unpacking "+v.filename+" RAR v"+Ver);
switch(Ver) {
case 15: // rar 1.5 compression
Unpack15(bstream, Solid);
break;
case 20: // rar 2.x compression
case 26: // files larger than 2GB
Unpack20(bstream, Solid);
break;
case 29: // rar 3.x compression
case 36: // alternative hash
Unpack29(bstream, Solid);
break;
} // switch(method)
rOldBuffers.push(rBuffer);
//TODO: clear these old buffers when there's over 4MB of history
return rBuffer.data;
}
// bstream is a bit stream
var RarLocalFile = function(bstream) {
this.header = new RarVolumeHeader(bstream);
this.filename = this.header.filename;
if (this.header.headType != FILE_HEAD && this.header.headType != ENDARC_HEAD) {
this.isValid = false;
info("Error! RAR Volume did not include a FILE_HEAD header ");
}
else {
// read in the compressed data
this.fileData = null;
if (this.header.packSize > 0) {
this.fileData = bstream.readBytes(this.header.packSize);
this.isValid = true;
}
}
};
RarLocalFile.prototype.unrar = function() {
if (!this.header.flags.LHD_SPLIT_BEFORE) {
// unstore file
if (this.header.method == 0x30) {
info("Unstore "+this.filename);
this.isValid = true;
currentBytesUnarchivedInFile += this.fileData.length;
currentBytesUnarchived += this.fileData.length;
// Create a new buffer and copy it over.
var len = this.header.packSize;
var newBuffer = new bitjs.io.ByteBuffer(len);
newBuffer.insertBytes(this.fileData);
this.fileData = newBuffer.data;
} else {
this.isValid = true;
this.fileData = unpack(this);
}
}
}
var unrar = function(arrayBuffer) {
currentFilename = "";
currentFileNumber = 0;
currentBytesUnarchivedInFile = 0;
currentBytesUnarchived = 0;
totalUncompressedBytesInArchive = 0;
totalFilesInArchive = 0;
postMessage(new bitjs.archive.UnarchiveStartEvent());
var bstream = new bitjs.io.BitStream(arrayBuffer, false /* rtl */);
var header = new RarVolumeHeader(bstream);
if (header.crc == 0x6152 &&
header.headType == 0x72 &&
header.flags.value == 0x1A21 &&
header.headSize == 7) {
info("Found RAR signature");
var mhead = new RarVolumeHeader(bstream);
if (mhead.headType != MAIN_HEAD) {
info("Error! RAR did not include a MAIN_HEAD header");
}
else {
var localFiles = [],
localFile = null;
do {
try {
localFile = new RarLocalFile(bstream);
info("RAR localFile isValid=" + localFile.isValid + ", volume packSize=" + localFile.header.packSize);
if (localFile && localFile.isValid && localFile.header.packSize > 0) {
totalUncompressedBytesInArchive += localFile.header.unpackedSize;
localFiles.push(localFile);
} else if (localFile.header.packSize == 0 && localFile.header.unpackedSize == 0) {
localFile.isValid = true;
}
} catch(err) {
break;
}
//info("bstream" + bstream.bytePtr+"/"+bstream.bytes.length);
} while( localFile.isValid );
totalFilesInArchive = localFiles.length;
// now we have all information but things are unpacked
// TODO: unpack
localFiles = localFiles.sort(function(a,b) {
var aname = a.filename;
var bname = b.filename;
return aname > bname ? 1 : -1;
// extract the number at the end of both filenames
/*
var aindex = aname.length, bindex = bname.length;
// Find the last number character from the back of the filename.
while (aname[aindex-1] < '0' || aname[aindex-1] > '9') --aindex;
while (bname[bindex-1] < '0' || bname[bindex-1] > '9') --bindex;
// Find the first number character from the back of the filename
while (aname[aindex-1] >= '0' && aname[aindex-1] <= '9') --aindex;
while (bname[bindex-1] >= '0' && bname[bindex-1] <= '9') --bindex;
// parse them into numbers and return comparison
var anum = parseInt(aname.substr(aindex), 10),
bnum = parseInt(bname.substr(bindex), 10);
return bnum - anum;*/
});
info(localFiles.map(function(a){return a.filename}).join(', '));
for (var i = 0; i < localFiles.length; ++i) {
var localfile = localFiles[i];
// update progress
currentFilename = localfile.header.filename;
currentBytesUnarchivedInFile = 0;
// actually do the unzipping
localfile.unrar();
if (localfile.isValid) {
postMessage(new bitjs.archive.UnarchiveExtractEvent(localfile));
postProgress();
}
}
postProgress();
}
}
else {
err("Invalid RAR file");
}
postMessage(new bitjs.archive.UnarchiveFinishEvent());
};
// event.data.file has the ArrayBuffer.
onmessage = function(event) {
var ab = event.data.file;
unrar(ab, true);
};