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@ -9,7 +9,7 @@
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* ZIP format: http://www.pkware.com/documents/casestudies/APPNOTE.TXT
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* DEFLATE format: http://tools.ietf.org/html/rfc1951
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*/
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/* global bitjs */
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/* global bitjs, importScripts, Uint8Array */
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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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@ -44,12 +44,12 @@ var zLocalFileHeaderSignature = 0x04034b50;
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var zArchiveExtraDataSignature = 0x08064b50;
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var zCentralFileHeaderSignature = 0x02014b50;
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var zDigitalSignatureSignature = 0x05054b50;
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var zEndOfCentralDirSignature = 0x06064b50;
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var zEndOfCentralDirLocatorSignature = 0x07064b50;
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//var zEndOfCentralDirSignature = 0x06064b50;
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//var zEndOfCentralDirLocatorSignature = 0x07064b50;
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// takes a ByteStream and parses out the local file information
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var ZipLocalFile = function(bstream) {
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if (typeof bstream != typeof {} || !bstream.readNumber || typeof bstream.readNumber != typeof function(){}) {
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if (typeof bstream !== typeof {} || !bstream.readNumber || typeof bstream.readNumber != typeof function() {} ) {
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return null;
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}
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@ -100,7 +100,7 @@ var ZipLocalFile = function(bstream) {
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// "This descriptor exists only if bit 3 of the general purpose bit flag is set"
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// But how do you figure out how big the file data is if you don't know the compressedSize
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// from the header?!?
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if ((this.generalPurpose & bitjs.BIT[3]) != 0) {
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if ((this.generalPurpose & bitjs.BIT[3]) !== 0) {
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this.crc32 = bstream.readNumber(4);
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this.compressedSize = bstream.readNumber(4);
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this.uncompressedSize = bstream.readNumber(4);
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@ -111,13 +111,13 @@ var ZipLocalFile = function(bstream) {
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ZipLocalFile.prototype.unzip = function() {
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// Zip Version 1.0, no compression (store only)
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if (this.compressionMethod == 0 ) {
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if (this.compressionMethod === 0 ) {
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info("ZIP v" + this.version + ", store only: " + this.filename + " (" + this.compressedSize + " bytes)");
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currentBytesUnarchivedInFile = this.compressedSize;
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currentBytesUnarchived += this.compressedSize;
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}
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// version == 20, compression method == 8 (DEFLATE)
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else if (this.compressionMethod == 8) {
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else if (this.compressionMethod === 8) {
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info("ZIP v2.0, DEFLATE: " + this.filename + " (" + this.compressedSize + " bytes)");
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this.fileData = inflate(this.fileData, this.uncompressedSize);
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}
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@ -144,10 +144,10 @@ var unzip = function(arrayBuffer) {
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var bstream = new bitjs.io.ByteStream(arrayBuffer);
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// detect local file header signature or return null
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if (bstream.peekNumber(4) == zLocalFileHeaderSignature) {
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if (bstream.peekNumber(4) === zLocalFileHeaderSignature) {
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var localFiles = [];
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// loop until we don't see any more local files
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while (bstream.peekNumber(4) == zLocalFileHeaderSignature) {
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while (bstream.peekNumber(4) === zLocalFileHeaderSignature) {
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var oneLocalFile = new ZipLocalFile(bstream);
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// this should strip out directories/folders
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if (oneLocalFile && oneLocalFile.uncompressedSize > 0 && oneLocalFile.fileData) {
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@ -165,7 +165,7 @@ var unzip = function(arrayBuffer) {
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});
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// archive extra data record
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if (bstream.peekNumber(4) == zArchiveExtraDataSignature) {
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if (bstream.peekNumber(4) === zArchiveExtraDataSignature) {
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info(" Found an Archive Extra Data Signature");
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// skipping this record for now
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@ -176,11 +176,11 @@ var unzip = function(arrayBuffer) {
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// central directory structure
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// TODO: handle the rest of the structures (Zip64 stuff)
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if (bstream.peekNumber(4) == zCentralFileHeaderSignature) {
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if (bstream.peekNumber(4) === zCentralFileHeaderSignature) {
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info(" Found a Central File Header");
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// read all file headers
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while (bstream.peekNumber(4) == zCentralFileHeaderSignature) {
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while (bstream.peekNumber(4) === zCentralFileHeaderSignature) {
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bstream.readNumber(4); // signature
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bstream.readNumber(2); // version made by
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bstream.readNumber(2); // version needed to extract
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@ -206,7 +206,7 @@ var unzip = function(arrayBuffer) {
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}
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// digital signature
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if (bstream.peekNumber(4) == zDigitalSignatureSignature) {
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if (bstream.peekNumber(4) === zDigitalSignatureSignature) {
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info(" Found a Digital Signature");
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bstream.readNumber(4);
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@ -231,7 +231,7 @@ var unzip = function(arrayBuffer) {
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// actually do the unzipping
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localfile.unzip();
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if (localfile.fileData != null) {
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if (localfile.fileData !== null) {
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postMessage(new bitjs.archive.UnarchiveExtractEvent(localfile));
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postProgress();
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}
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@ -239,58 +239,58 @@ var unzip = function(arrayBuffer) {
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postProgress();
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postMessage(new bitjs.archive.UnarchiveFinishEvent());
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}
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}
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};
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// returns a table of Huffman codes
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// each entry's index is its code and its value is a JavaScript object
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// containing {length: 6, symbol: X}
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function getHuffmanCodes(bitLengths) {
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// ensure bitLengths is an array containing at least one element
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if (typeof bitLengths != typeof [] || bitLengths.length < 1) {
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if (typeof bitLengths !== typeof [] || bitLengths.length < 1) {
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err("Error! getHuffmanCodes() called with an invalid array");
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return null;
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}
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// Reference: http://tools.ietf.org/html/rfc1951#page-8
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var numLengths = bitLengths.length,
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bl_count = [],
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blCount = [],
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MAX_BITS = 1;
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// Step 1: count up how many codes of each length we have
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for (var i = 0; i < numLengths; ++i) {
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var length = bitLengths[i];
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var len = bitLengths[i];
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// test to ensure each bit length is a positive, non-zero number
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if (typeof length != typeof 1 || length < 0) {
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err("bitLengths contained an invalid number in getHuffmanCodes(): " + length + " of type " + (typeof length));
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if (typeof len !== typeof 1 || len < 0) {
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err("bitLengths contained an invalid number in getHuffmanCodes(): " + len + " of type " + (typeof len));
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return null;
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}
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// increment the appropriate bitlength count
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if (bl_count[length] == undefined) bl_count[length] = 0;
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if (blCount[len] === undefined) blCount[len] = 0;
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// a length of zero means this symbol is not participating in the huffman coding
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if (length > 0) bl_count[length]++;
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if (len > 0) blCount[len]++;
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if (length > MAX_BITS) MAX_BITS = length;
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if (len > MAX_BITS) MAX_BITS = len;
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}
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// Step 2: Find the numerical value of the smallest code for each code length
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var next_code = [],
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var nextCode = [],
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code = 0;
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for (var bits = 1; bits <= MAX_BITS; ++bits) {
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var length = bits-1;
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var len = bits-1;
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// ensure undefined lengths are zero
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if (bl_count[length] == undefined) bl_count[length] = 0;
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code = (code + bl_count[bits-1]) << 1;
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next_code[bits] = code;
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if (blCount[len] == undefined) blCount[len] = 0;
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code = (code + blCount[bits-1]) << 1;
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nextCode[bits] = code;
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}
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// Step 3: Assign numerical values to all codes
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var table = {}, tableLength = 0;
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for (var n = 0; n < numLengths; ++n) {
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var len = bitLengths[n];
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if (len != 0) {
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table[next_code[len]] = { length: len, symbol: n }; //, bitstring: binaryValueToString(next_code[len],len) };
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if (len !== 0) {
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table[nextCode[len]] = { length: len, symbol: n }; //, bitstring: binaryValueToString(nextCode[len],len) };
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tableLength++;
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next_code[len]++;
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nextCode[len]++;
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}
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}
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table.maxLength = tableLength;
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@ -322,9 +322,9 @@ function getFixedLiteralTable() {
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if (!fixedHCtoLiteral) {
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var bitlengths = new Array(288);
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for (var i = 0; i <= 143; ++i) bitlengths[i] = 8;
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for (i = 144; i <= 255; ++i) bitlengths[i] = 9;
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for (i = 256; i <= 279; ++i) bitlengths[i] = 7;
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for (i = 280; i <= 287; ++i) bitlengths[i] = 8;
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for (var i = 144; i <= 255; ++i) bitlengths[i] = 9;
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for (var i = 256; i <= 279; ++i) bitlengths[i] = 7;
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for (var i = 280; i <= 287; ++i) bitlengths[i] = 8;
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// get huffman code table
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fixedHCtoLiteral = getHuffmanCodes(bitlengths);
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@ -335,7 +335,9 @@ function getFixedDistanceTable() {
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// create once
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if (!fixedHCtoDistance) {
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var bitlengths = new Array(32);
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for (var i = 0; i < 32; ++i) { bitlengths[i] = 5; }
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for (var i = 0; i < 32; ++i) {
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bitlengths[i] = 5;
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}
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// get huffman code table
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fixedHCtoDistance = getHuffmanCodes(bitlengths);
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@ -347,7 +349,7 @@ function getFixedDistanceTable() {
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// then return that symbol
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function decodeSymbol(bstream, hcTable) {
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var code = 0, len = 0;
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var match = false;
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// var match = false;
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// loop until we match
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for (;;) {
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@ -457,7 +459,7 @@ function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
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}
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else {
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// end of block reached
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if (symbol == 256) {
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if (symbol === 256) {
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break;
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}
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else {
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@ -504,12 +506,13 @@ function inflate(compressedData, numDecompressedBytes) {
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compressedData.byteOffset,
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compressedData.byteLength);
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var buffer = new bitjs.io.ByteBuffer(numDecompressedBytes);
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var numBlocks = 0, blockSize = 0;
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var numBlocks = 0;
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var blockSize = 0;
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// block format: http://tools.ietf.org/html/rfc1951#page-9
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do {
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var bFinal = bstream.readBits(1),
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bType = bstream.readBits(2);
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var bFinal = bstream.readBits(1);
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var bType = bstream.readBits(2);
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blockSize = 0;
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++numBlocks;
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// no compression
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@ -524,11 +527,11 @@ function inflate(compressedData, numDecompressedBytes) {
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blockSize = len;
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}
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// fixed Huffman codes
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else if(bType == 1) {
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else if(bType === 1) {
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blockSize = inflateBlockData(bstream, getFixedLiteralTable(), getFixedDistanceTable(), buffer);
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}
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// dynamic Huffman codes
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else if(bType == 2) {
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else if(bType === 2) {
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var numLiteralLengthCodes = bstream.readBits(5) + 257;
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var numDistanceCodes = bstream.readBits(5) + 1,
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numCodeLengthCodes = bstream.readBits(4) + 4;
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@ -566,19 +569,19 @@ function inflate(compressedData, numDecompressedBytes) {
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literalCodeLengths.push(symbol);
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prevCodeLength = symbol;
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}
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else if (symbol == 16) {
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else if (symbol === 16) {
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var repeat = bstream.readBits(2) + 3;
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while (repeat--) {
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literalCodeLengths.push(prevCodeLength);
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}
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}
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else if (symbol == 17) {
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else if (symbol === 17) {
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var repeat = bstream.readBits(3) + 3;
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while (repeat--) {
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literalCodeLengths.push(0);
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}
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}
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else if (symbol == 18) {
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else if (symbol === 18) {
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var repeat = bstream.readBits(7) + 11;
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while (repeat--) {
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literalCodeLengths.push(0);
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@ -605,7 +608,7 @@ function inflate(compressedData, numDecompressedBytes) {
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currentBytesUnarchived += blockSize;
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postProgress();
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} while (bFinal != 1);
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} while (bFinal !== 1);
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// we are done reading blocks if the bFinal bit was set for this block
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// return the buffer data bytes
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OzzieIsaacs
7 years ago