mirror of
https://github.com/janeczku/calibre-web
synced 2024-12-20 23:20:32 +00:00
902 lines
28 KiB
JavaScript
902 lines
28 KiB
JavaScript
/**
|
|
* unrar.js
|
|
*
|
|
* Copyright(c) 2011 Google Inc.
|
|
* Copyright(c) 2011 antimatter15
|
|
*
|
|
* Reference Documentation:
|
|
*
|
|
* http://kthoom.googlecode.com/hg/docs/unrar.html
|
|
*/
|
|
/* global bitjs, importScripts */
|
|
|
|
// 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
|
|
// MARK_HEAD = 0x72;
|
|
var 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);
|
|
var _s = "";
|
|
for (var _i = 0; _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;
|
|
|
|
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 rLowDistRepCount = 16;
|
|
|
|
var rNC = 299,
|
|
rDC = 60,
|
|
rLDC = 17,
|
|
rRC = 28,
|
|
rBC = 20,
|
|
rHuffTableSize = (rNC + rDC + rRC + rLDC);
|
|
|
|
//var UnpBlockType = BLOCK_LZ;
|
|
var UnpOldTable = new Array(rHuffTableSize);
|
|
|
|
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(rHuffTableSize);
|
|
var i;
|
|
// 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 (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 = rHuffTableSize;
|
|
//console.log(DecodeLen, DecodePos, DecodeNum);
|
|
for (i = 0; i < TableSize;) {
|
|
var N;
|
|
var num = rarDecodeNumber(bstream, BD);
|
|
if (num < 16) {
|
|
Table[i] = (num + UnpOldTable[i]) & 0xf;
|
|
i++;
|
|
} else if (num < 18) {
|
|
N = (num === 16) ? (bstream.readBits(3) + 3) : (bstream.readBits(7) + 11);
|
|
|
|
while (N-- > 0 && i < TableSize) {
|
|
Table[i] = Table[i - 1];
|
|
i++;
|
|
}
|
|
} else {
|
|
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 (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;
|
|
var i;
|
|
for (i = DecodeNum.length; i--;) DecodeNum[i] = 0;
|
|
for (i = 0; i < size; i++) {
|
|
LenCount[BitLength[i + offset] & 0xF]++;
|
|
}
|
|
LenCount[0] = 0;
|
|
TmpPos[0] = 0;
|
|
DecodePos[0] = 0;
|
|
DecodeLen[0] = 0;
|
|
|
|
var I;
|
|
for (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");
|
|
}
|
|
|
|
var lowDistRepCount = 0, prevLowDist = 0;
|
|
|
|
var rOldDist = [0, 0, 0, 0];
|
|
|
|
var lastDist = 0;
|
|
var lastLength = 0;
|
|
|
|
function Unpack20(bstream) { //, Solid) {
|
|
var destUnpSize = rBuffer.data.length;
|
|
var oldDistPtr = 0;
|
|
var Length;
|
|
var Distance;
|
|
rarReadTables20(bstream);
|
|
while (destUnpSize > rBuffer.ptr) {
|
|
var num = rarDecodeNumber(bstream, LD);
|
|
var Bits;
|
|
if (num < 256) {
|
|
rBuffer.insertByte(num);
|
|
continue;
|
|
}
|
|
if (num > 269) {
|
|
Length = rLDecode[num -= 270] + 3;
|
|
if ((Bits = rLBits[num]) > 0) {
|
|
Length += bstream.readBits(Bits);
|
|
}
|
|
var DistNumber = rarDecodeNumber(bstream, DD);
|
|
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) {
|
|
Distance = rOldDist[(oldDistPtr - (num - 256)) & 3];
|
|
var LengthNumber = rarDecodeNumber(bstream, RD);
|
|
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;
|
|
bstream.readBits(1);
|
|
if (!bstream.readBits(1)) {
|
|
var i;
|
|
for (i = UnpOldTable20.length; i--;) UnpOldTable20[i] = 0;
|
|
}
|
|
TableSize = rNC20 + rDC20 + rRC20;
|
|
for (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 (i = UnpOldTable20.length; i--;) UnpOldTable20[i] = Table[i];
|
|
}
|
|
|
|
|
|
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;
|
|
var I;
|
|
for (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;
|
|
var i;
|
|
for (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 = rLowDistRepCount - 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.toLowerCase();
|
|
var bname = b.filename.toLowerCase();
|
|
return aname > bname ? 1 : -1;
|
|
});
|
|
|
|
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);
|
|
};
|