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https://github.com/codedread/bitjs
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Convert to ES6 classes
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codedread
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8 changed files with 1385 additions and 1415 deletions
114
archive/unzip.js
114
archive/unzip.js
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@ -50,8 +50,16 @@ const zDigitalSignatureSignature = 0x05054b50;
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const zEndOfCentralDirSignature = 0x06064b50;
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const zEndOfCentralDirLocatorSignature = 0x07064b50;
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// takes a ByteStream and parses out the local file information
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const ZipLocalFile = function(bstream) {
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// mask for getting the Nth bit (zero-based)
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const BIT = [ 0x01, 0x02, 0x04, 0x08,
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0x10, 0x20, 0x40, 0x80,
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0x100, 0x200, 0x400, 0x800,
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0x1000, 0x2000, 0x4000, 0x8000];
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class ZipLocalFile {
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// takes a ByteStream and parses out the local file information
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constructor(bstream) {
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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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@ -103,32 +111,32 @@ const 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 & 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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}
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};
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}
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// determine what kind of compressed data we have and decompress
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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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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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// determine what kind of compressed data we have and decompress
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unzip() {
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// Zip Version 1.0, no compression (store only)
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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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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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else {
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err("UNSUPPORTED VERSION/FORMAT: ZIP v" + this.version + ", compression method=" + this.compressionMethod + ": " + this.filename + " (" + this.compressedSize + " bytes)");
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this.fileData = null;
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}
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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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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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else {
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err("UNSUPPORTED VERSION/FORMAT: ZIP v" + this.version + ", compression method=" + this.compressionMethod + ": " + this.filename + " (" + this.compressedSize + " bytes)");
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this.fileData = null;
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}
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};
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}
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// Takes an ArrayBuffer of a zip file in
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// returns null on error
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@ -374,21 +382,22 @@ function decodeSymbol(bstream, hcTable) {
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const CodeLengthCodeOrder = [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15];
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/*
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Extra Extra Extra
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Code Bits Length(s) Code Bits Lengths Code Bits Length(s)
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---- ---- ------ ---- ---- ------- ---- ---- -------
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257 0 3 267 1 15,16 277 4 67-82
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258 0 4 268 1 17,18 278 4 83-98
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259 0 5 269 2 19-22 279 4 99-114
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260 0 6 270 2 23-26 280 4 115-130
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261 0 7 271 2 27-30 281 5 131-162
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262 0 8 272 2 31-34 282 5 163-194
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263 0 9 273 3 35-42 283 5 195-226
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264 0 10 274 3 43-50 284 5 227-257
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265 1 11,12 275 3 51-58 285 0 258
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266 1 13,14 276 3 59-66
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*/
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/*
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Extra Extra Extra
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Code Bits Length(s) Code Bits Lengths Code Bits Length(s)
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---- ---- ------ ---- ---- ------- ---- ---- -------
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257 0 3 267 1 15,16 277 4 67-82
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258 0 4 268 1 17,18 278 4 83-98
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259 0 5 269 2 19-22 279 4 99-114
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260 0 6 270 2 23-26 280 4 115-130
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261 0 7 271 2 27-30 281 5 131-162
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262 0 8 272 2 31-34 282 5 163-194
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263 0 9 273 3 35-42 283 5 195-226
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264 0 10 274 3 43-50 284 5 227-257
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265 1 11,12 275 3 51-58 285 0 258
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266 1 13,14 276 3 59-66
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*/
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const LengthLookupTable = [
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[0,3], [0,4], [0,5], [0,6],
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[0,7], [0,8], [0,9], [0,10],
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@ -399,21 +408,22 @@ const LengthLookupTable = [
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[5,131], [5,163], [5,195], [5,227],
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[0,258]
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];
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/*
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Extra Extra Extra
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Code Bits Dist Code Bits Dist Code Bits Distance
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---- ---- ---- ---- ---- ------ ---- ---- --------
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0 0 1 10 4 33-48 20 9 1025-1536
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1 0 2 11 4 49-64 21 9 1537-2048
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2 0 3 12 5 65-96 22 10 2049-3072
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3 0 4 13 5 97-128 23 10 3073-4096
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4 1 5,6 14 6 129-192 24 11 4097-6144
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5 1 7,8 15 6 193-256 25 11 6145-8192
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6 2 9-12 16 7 257-384 26 12 8193-12288
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7 2 13-16 17 7 385-512 27 12 12289-16384
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8 3 17-24 18 8 513-768 28 13 16385-24576
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9 3 25-32 19 8 769-1024 29 13 24577-32768
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*/
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/*
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Extra Extra Extra
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Code Bits Dist Code Bits Dist Code Bits Distance
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---- ---- ---- ---- ---- ------ ---- ---- --------
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0 0 1 10 4 33-48 20 9 1025-1536
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1 0 2 11 4 49-64 21 9 1537-2048
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2 0 3 12 5 65-96 22 10 2049-3072
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3 0 4 13 5 97-128 23 10 3073-4096
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4 1 5,6 14 6 129-192 24 11 4097-6144
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5 1 7,8 15 6 193-256 25 11 6145-8192
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6 2 9-12 16 7 257-384 26 12 8193-12288
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7 2 13-16 17 7 385-512 27 12 12289-16384
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8 3 17-24 18 8 513-768 28 13 16385-24576
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9 3 25-32 19 8 769-1024 29 13 24577-32768
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*/
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const DistLookupTable = [
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[0,1], [0,2], [0,3], [0,4],
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[1,5], [1,7],
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