mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-14 22:04:54 +00:00
902 lines
28 KiB
JavaScript
902 lines
28 KiB
JavaScript
/**
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* unrar.js
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*
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* Copyright(c) 2011 Google Inc.
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* Copyright(c) 2011 antimatter15
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*
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* Reference Documentation:
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*
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* http://kthoom.googlecode.com/hg/docs/unrar.html
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*/
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/* global bitjs, importScripts */
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// This file expects to be invoked as a Worker (see onmessage below).
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importScripts("io.js");
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importScripts("archive.js");
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// Progress variables.
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var currentFilename = "";
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var currentFileNumber = 0;
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var currentBytesUnarchivedInFile = 0;
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var currentBytesUnarchived = 0;
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var totalUncompressedBytesInArchive = 0;
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var totalFilesInArchive = 0;
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// Helper functions.
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var info = function(str) {
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postMessage(new bitjs.archive.UnarchiveInfoEvent(str));
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};
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var err = function(str) {
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postMessage(new bitjs.archive.UnarchiveErrorEvent(str));
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};
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var postProgress = function() {
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postMessage(new bitjs.archive.UnarchiveProgressEvent(
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currentFilename,
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currentFileNumber,
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currentBytesUnarchivedInFile,
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currentBytesUnarchived,
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totalUncompressedBytesInArchive,
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totalFilesInArchive));
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};
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// shows a byte value as its hex representation
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var nibble = "0123456789ABCDEF";
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var byteValueToHexString = function(num) {
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return nibble[num >> 4] + nibble[num & 0xF];
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};
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var twoByteValueToHexString = function(num) {
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return nibble[(num >> 12) & 0xF] + nibble[(num >> 8) & 0xF] + nibble[(num >> 4) & 0xF] + nibble[num & 0xF];
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};
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// Volume Types
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// MARK_HEAD = 0x72;
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var MAIN_HEAD = 0x73,
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FILE_HEAD = 0x74,
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// COMM_HEAD = 0x75,
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// AV_HEAD = 0x76,
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// SUB_HEAD = 0x77,
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// PROTECT_HEAD = 0x78,
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// SIGN_HEAD = 0x79,
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// NEWSUB_HEAD = 0x7a,
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ENDARC_HEAD = 0x7b;
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// bstream is a bit stream
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var RarVolumeHeader = function(bstream) {
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var headPos = bstream.bytePtr;
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// byte 1,2
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info("Rar Volume Header @" + bstream.bytePtr);
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this.crc = bstream.readBits(16);
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info(" crc=" + this.crc);
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// byte 3
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this.headType = bstream.readBits(8);
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info(" headType=" + this.headType);
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// Get flags
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// bytes 4,5
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this.flags = {};
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this.flags.value = bstream.peekBits(16);
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info(" flags=" + twoByteValueToHexString(this.flags.value));
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switch (this.headType) {
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case MAIN_HEAD:
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this.flags.MHD_VOLUME = !!bstream.readBits(1);
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this.flags.MHD_COMMENT = !!bstream.readBits(1);
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this.flags.MHD_LOCK = !!bstream.readBits(1);
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this.flags.MHD_SOLID = !!bstream.readBits(1);
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this.flags.MHD_PACK_COMMENT = !!bstream.readBits(1);
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this.flags.MHD_NEWNUMBERING = this.flags.MHD_PACK_COMMENT;
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this.flags.MHD_AV = !!bstream.readBits(1);
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this.flags.MHD_PROTECT = !!bstream.readBits(1);
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this.flags.MHD_PASSWORD = !!bstream.readBits(1);
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this.flags.MHD_FIRSTVOLUME = !!bstream.readBits(1);
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this.flags.MHD_ENCRYPTVER = !!bstream.readBits(1);
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bstream.readBits(6); // unused
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break;
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case FILE_HEAD:
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this.flags.LHD_SPLIT_BEFORE = !!bstream.readBits(1); // 0x0001
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this.flags.LHD_SPLIT_AFTER = !!bstream.readBits(1); // 0x0002
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this.flags.LHD_PASSWORD = !!bstream.readBits(1); // 0x0004
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this.flags.LHD_COMMENT = !!bstream.readBits(1); // 0x0008
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this.flags.LHD_SOLID = !!bstream.readBits(1); // 0x0010
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bstream.readBits(3); // unused
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this.flags.LHD_LARGE = !!bstream.readBits(1); // 0x0100
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this.flags.LHD_UNICODE = !!bstream.readBits(1); // 0x0200
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this.flags.LHD_SALT = !!bstream.readBits(1); // 0x0400
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this.flags.LHD_VERSION = !!bstream.readBits(1); // 0x0800
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this.flags.LHD_EXTTIME = !!bstream.readBits(1); // 0x1000
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this.flags.LHD_EXTFLAGS = !!bstream.readBits(1); // 0x2000
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bstream.readBits(2); // unused
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info(" LHD_SPLIT_BEFORE = " + this.flags.LHD_SPLIT_BEFORE);
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break;
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default:
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bstream.readBits(16);
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}
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// byte 6,7
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this.headSize = bstream.readBits(16);
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info(" headSize=" + this.headSize);
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switch (this.headType) {
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case MAIN_HEAD:
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this.highPosAv = bstream.readBits(16);
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this.posAv = bstream.readBits(32);
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if (this.flags.MHD_ENCRYPTVER) {
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this.encryptVer = bstream.readBits(8);
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}
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info("Found MAIN_HEAD with highPosAv=" + this.highPosAv + ", posAv=" + this.posAv);
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break;
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case FILE_HEAD:
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this.packSize = bstream.readBits(32);
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this.unpackedSize = bstream.readBits(32);
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this.hostOS = bstream.readBits(8);
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this.fileCRC = bstream.readBits(32);
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this.fileTime = bstream.readBits(32);
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this.unpVer = bstream.readBits(8);
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this.method = bstream.readBits(8);
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this.nameSize = bstream.readBits(16);
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this.fileAttr = bstream.readBits(32);
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if (this.flags.LHD_LARGE) {
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info("Warning: Reading in LHD_LARGE 64-bit size values");
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this.HighPackSize = bstream.readBits(32);
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this.HighUnpSize = bstream.readBits(32);
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} else {
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this.HighPackSize = 0;
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this.HighUnpSize = 0;
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if (this.unpackedSize === 0xffffffff) {
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this.HighUnpSize = 0x7fffffff;
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this.unpackedSize = 0xffffffff;
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}
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}
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this.fullPackSize = 0;
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this.fullUnpackSize = 0;
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this.fullPackSize |= this.HighPackSize;
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this.fullPackSize <<= 32;
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this.fullPackSize |= this.packSize;
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// read in filename
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this.filename = bstream.readBytes(this.nameSize);
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var _s = "";
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for (var _i = 0; _i < this.filename.length ; _i++) {
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_s += String.fromCharCode(this.filename[_i]);
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}
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this.filename = _s;
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if (this.flags.LHD_SALT) {
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info("Warning: Reading in 64-bit salt value");
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this.salt = bstream.readBits(64); // 8 bytes
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}
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if (this.flags.LHD_EXTTIME) {
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// 16-bit flags
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var extTimeFlags = bstream.readBits(16);
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// this is adapted straight out of arcread.cpp, Archive::ReadHeader()
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for (var I = 0; I < 4; ++I) {
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var rmode = extTimeFlags >> ((3 - I) * 4);
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if ((rmode & 8) === 0) {
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continue;
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}
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if (I !== 0) {
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bstream.readBits(16);
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}
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var count = (rmode & 3);
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for (var J = 0; J < count; ++J) {
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bstream.readBits(8);
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}
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}
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}
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if (this.flags.LHD_COMMENT) {
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info("Found a LHD_COMMENT");
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}
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while (headPos + this.headSize > bstream.bytePtr) bstream.readBits(1);
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info("Found FILE_HEAD with packSize=" + this.packSize + ", unpackedSize= " + this.unpackedSize + ", hostOS=" + this.hostOS + ", unpVer=" + this.unpVer + ", method=" + this.method + ", filename=" + this.filename);
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break;
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default:
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info("Found a header of type 0x" + byteValueToHexString(this.headType));
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// skip the rest of the header bytes (for now)
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bstream.readBytes( this.headSize - 7 );
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break;
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}
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};
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//var BLOCK_LZ = 0;
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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],
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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],
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rDBitLengthCounts = [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 14, 0, 12],
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rSDDecode = [0, 4, 8, 16, 32, 64, 128, 192],
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rSDBits = [2, 2, 3, 4, 5, 6, 6, 6];
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var rDDecode = [0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32,
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48, 64, 96, 128, 192, 256, 384, 512, 768, 1024, 1536, 2048, 3072,
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4096, 6144, 8192, 12288, 16384, 24576, 32768, 49152, 65536, 98304,
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131072, 196608, 262144, 327680, 393216, 458752, 524288, 589824,
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655360, 720896, 786432, 851968, 917504, 983040];
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var rDBits = [0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,
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5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14,
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15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16];
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var rLowDistRepCount = 16;
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var rNC = 299,
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rDC = 60,
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rLDC = 17,
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rRC = 28,
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rBC = 20,
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rHuffTableSize = (rNC + rDC + rRC + rLDC);
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//var UnpBlockType = BLOCK_LZ;
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var UnpOldTable = new Array(rHuffTableSize);
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var BD = { //bitdecode
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DecodeLen: new Array(16),
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DecodePos: new Array(16),
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DecodeNum: new Array(rBC)
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};
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var LD = { //litdecode
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DecodeLen: new Array(16),
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DecodePos: new Array(16),
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DecodeNum: new Array(rNC)
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};
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var DD = { //distdecode
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DecodeLen: new Array(16),
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DecodePos: new Array(16),
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DecodeNum: new Array(rDC)
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};
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var LDD = { //low dist decode
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DecodeLen: new Array(16),
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DecodePos: new Array(16),
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DecodeNum: new Array(rLDC)
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};
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var RD = { //rep decode
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DecodeLen: new Array(16),
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DecodePos: new Array(16),
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DecodeNum: new Array(rRC)
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};
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var rBuffer;
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// read in Huffman tables for RAR
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function RarReadTables(bstream) {
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var BitLength = new Array(rBC),
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Table = new Array(rHuffTableSize);
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var i;
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// before we start anything we need to get byte-aligned
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bstream.readBits( (8 - bstream.bitPtr) & 0x7 );
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if (bstream.readBits(1)) {
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info("Error! PPM not implemented yet");
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return;
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}
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if (!bstream.readBits(1)) { //discard old table
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for (i = UnpOldTable.length; i--;) UnpOldTable[i] = 0;
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}
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// read in bit lengths
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for (var I = 0; I < rBC; ++I) {
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var Length = bstream.readBits(4);
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if (Length === 15) {
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var ZeroCount = bstream.readBits(4);
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if (ZeroCount === 0) {
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BitLength[I] = 15;
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} else {
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ZeroCount += 2;
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while (ZeroCount-- > 0 && I < rBC) {
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BitLength[I++] = 0;
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}
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--I;
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}
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} else {
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BitLength[I] = Length;
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}
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}
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// now all 20 bit lengths are obtained, we construct the Huffman Table:
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rarMakeDecodeTables(BitLength, 0, BD, rBC);
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var TableSize = rHuffTableSize;
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//console.log(DecodeLen, DecodePos, DecodeNum);
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for (i = 0; i < TableSize;) {
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var N;
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var num = rarDecodeNumber(bstream, BD);
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if (num < 16) {
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Table[i] = (num + UnpOldTable[i]) & 0xf;
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i++;
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} else if (num < 18) {
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N = (num === 16) ? (bstream.readBits(3) + 3) : (bstream.readBits(7) + 11);
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while (N-- > 0 && i < TableSize) {
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Table[i] = Table[i - 1];
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i++;
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}
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} else {
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N = (num === 18) ? (bstream.readBits(3) + 3) : (bstream.readBits(7) + 11);
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while (N-- > 0 && i < TableSize) {
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Table[i++] = 0;
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}
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}
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}
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rarMakeDecodeTables(Table, 0, LD, rNC);
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rarMakeDecodeTables(Table, rNC, DD, rDC);
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rarMakeDecodeTables(Table, rNC + rDC, LDD, rLDC);
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rarMakeDecodeTables(Table, rNC + rDC + rLDC, RD, rRC);
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for (i = UnpOldTable.length; i--;) {
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UnpOldTable[i] = Table[i];
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}
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return true;
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}
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function rarDecodeNumber(bstream, dec) {
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var DecodeLen = dec.DecodeLen, DecodePos = dec.DecodePos, DecodeNum = dec.DecodeNum;
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var bitField = bstream.getBits() & 0xfffe;
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//some sort of rolled out binary search
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var bits = ((bitField < DecodeLen[8]) ?
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((bitField < DecodeLen[4]) ?
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((bitField < DecodeLen[2]) ?
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((bitField < DecodeLen[1]) ? 1 : 2)
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: ((bitField < DecodeLen[3]) ? 3 : 4))
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: (bitField < DecodeLen[6]) ?
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((bitField < DecodeLen[5]) ? 5 : 6)
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: ((bitField < DecodeLen[7]) ? 7 : 8))
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: ((bitField < DecodeLen[12]) ?
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((bitField < DecodeLen[10]) ?
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((bitField < DecodeLen[9]) ? 9 : 10)
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: ((bitField < DecodeLen[11]) ? 11 : 12))
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: (bitField < DecodeLen[14]) ?
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((bitField < DecodeLen[13]) ? 13 : 14)
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: 15));
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bstream.readBits(bits);
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var N = DecodePos[bits] + ((bitField - DecodeLen[bits - 1]) >>> (16 - bits));
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return DecodeNum[N];
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}
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function rarMakeDecodeTables(BitLength, offset, dec, size) {
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var DecodeLen = dec.DecodeLen, DecodePos = dec.DecodePos, DecodeNum = dec.DecodeNum;
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var LenCount = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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TmpPos = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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N = 0, M = 0;
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var i;
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for (i = DecodeNum.length; i--;) DecodeNum[i] = 0;
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for (i = 0; i < size; i++) {
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LenCount[BitLength[i + offset] & 0xF]++;
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}
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LenCount[0] = 0;
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TmpPos[0] = 0;
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DecodePos[0] = 0;
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DecodeLen[0] = 0;
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var I;
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for (I = 1; I < 16; ++I) {
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N = 2 * (N + LenCount[I]);
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M = (N << (15 - I));
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if (M > 0xFFFF) {
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M = 0xFFFF;
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}
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DecodeLen[I] = M;
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DecodePos[I] = DecodePos[I - 1] + LenCount[I - 1];
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TmpPos[I] = DecodePos[I];
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}
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for (I = 0; I < size; ++I) {
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if (BitLength[I + offset] !== 0) {
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DecodeNum[ TmpPos[ BitLength[offset + I] & 0xF ]++] = I;
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}
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}
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}
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// TODO: implement
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function Unpack15() { //bstream, Solid) {
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info("ERROR! RAR 1.5 compression not supported");
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}
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var lowDistRepCount = 0, prevLowDist = 0;
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var rOldDist = [0, 0, 0, 0];
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var lastDist = 0;
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var lastLength = 0;
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function Unpack20(bstream) { //, Solid) {
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var destUnpSize = rBuffer.data.length;
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var oldDistPtr = 0;
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var Length;
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var Distance;
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rarReadTables20(bstream);
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while (destUnpSize > rBuffer.ptr) {
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var num = rarDecodeNumber(bstream, LD);
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var Bits;
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if (num < 256) {
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rBuffer.insertByte(num);
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continue;
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}
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if (num > 269) {
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Length = rLDecode[num -= 270] + 3;
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if ((Bits = rLBits[num]) > 0) {
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Length += bstream.readBits(Bits);
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}
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var DistNumber = rarDecodeNumber(bstream, DD);
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Distance = rDDecode[DistNumber] + 1;
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if ((Bits = rDBits[DistNumber]) > 0) {
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Distance += bstream.readBits(Bits);
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}
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if (Distance >= 0x2000) {
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Length++;
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if (Distance >= 0x40000) Length++;
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}
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lastLength = Length;
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lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
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rarCopyString(Length, Distance);
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continue;
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}
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if (num === 269) {
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rarReadTables20(bstream);
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rarUpdateProgress();
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continue;
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}
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if (num === 256) {
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lastDist = rOldDist[oldDistPtr++ & 3] = lastDist;
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rarCopyString(lastLength, lastDist);
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continue;
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}
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if (num < 261) {
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Distance = rOldDist[(oldDistPtr - (num - 256)) & 3];
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var LengthNumber = rarDecodeNumber(bstream, RD);
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Length = rLDecode[LengthNumber] + 2;
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if ((Bits = rLBits[LengthNumber]) > 0) {
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Length += bstream.readBits(Bits);
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}
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if (Distance >= 0x101) {
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|
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);
|
|
};
|