mirror of
https://github.com/codedread/bitjs
synced 2025-10-04 01:59:15 +02:00
Start the move to es6: Change all vars to lets/consts
This commit is contained in:
parent
87cdd92981
commit
639a23e69b
11 changed files with 514 additions and 555 deletions
216
archive/unzip.js
216
archive/unzip.js
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@ -19,21 +19,21 @@ importScripts('../io/bytestream.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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let currentFilename = "";
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let currentFileNumber = 0;
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let currentBytesUnarchivedInFile = 0;
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let currentBytesUnarchived = 0;
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let totalUncompressedBytesInArchive = 0;
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let totalFilesInArchive = 0;
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// Helper functions.
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var info = function(str) {
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const 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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const 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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const 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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@ -43,15 +43,15 @@ var postProgress = function() {
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totalFilesInArchive));
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};
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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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const zLocalFileHeaderSignature = 0x04034b50;
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const zArchiveExtraDataSignature = 0x08064b50;
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const zCentralFileHeaderSignature = 0x02014b50;
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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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var ZipLocalFile = function(bstream) {
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const ZipLocalFile = function(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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@ -112,7 +112,6 @@ var ZipLocalFile = function(bstream) {
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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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@ -134,7 +133,7 @@ ZipLocalFile.prototype.unzip = function() {
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// Takes an ArrayBuffer of a zip file in
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// returns null on error
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// returns an array of DecompressedFile objects on success
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var unzip = function(arrayBuffer) {
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const unzip = function(arrayBuffer) {
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postMessage(new bitjs.archive.UnarchiveStartEvent());
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currentFilename = "";
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@ -145,13 +144,13 @@ var unzip = function(arrayBuffer) {
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totalFilesInArchive = 0;
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currentBytesUnarchived = 0;
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var bstream = new bitjs.io.ByteStream(arrayBuffer);
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const 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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var localFiles = [];
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const 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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var oneLocalFile = new ZipLocalFile(bstream);
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const 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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localFiles.push(oneLocalFile);
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@ -162,29 +161,7 @@ var unzip = function(arrayBuffer) {
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// got all local files, now sort them
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localFiles.sort(function(a,b) {
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var aname = a.filename;
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var bname = b.filename;
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return aname > bname ? 1 : -1;
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// extract the number at the end of both filenames
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/*
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var aname = a.filename;
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var bname = b.filename;
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var aindex = aname.length, bindex = bname.length;
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// Find the last number character from the back of the filename.
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while (aname[aindex-1] < '0' || aname[aindex-1] > '9') --aindex;
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while (bname[bindex-1] < '0' || bname[bindex-1] > '9') --bindex;
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// Find the first number character from the back of the filename
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while (aname[aindex-1] >= '0' && aname[aindex-1] <= '9') --aindex;
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while (bname[bindex-1] >= '0' && bname[bindex-1] <= '9') --bindex;
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// parse them into numbers and return comparison
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var anum = parseInt(aname.substr(aindex), 10),
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bnum = parseInt(bname.substr(bindex), 10);
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return anum - bnum;
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*/
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return a.filename > b.filename ? 1 : -1;
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});
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// archive extra data record
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@ -193,7 +170,7 @@ var unzip = function(arrayBuffer) {
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// skipping this record for now
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bstream.readNumber(4);
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var archiveExtraFieldLength = bstream.readNumber(4);
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const archiveExtraFieldLength = bstream.readNumber(4);
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bstream.readString(archiveExtraFieldLength);
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}
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@ -214,9 +191,9 @@ var unzip = function(arrayBuffer) {
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bstream.readNumber(4); // crc32
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bstream.readNumber(4); // compressed size
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bstream.readNumber(4); // uncompressed size
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var fileNameLength = bstream.readNumber(2); // file name length
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var extraFieldLength = bstream.readNumber(2); // extra field length
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var fileCommentLength = bstream.readNumber(2); // file comment length
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const fileNameLength = bstream.readNumber(2); // file name length
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const extraFieldLength = bstream.readNumber(2); // extra field length
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const fileCommentLength = bstream.readNumber(2); // file comment length
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bstream.readNumber(2); // disk number start
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bstream.readNumber(2); // internal file attributes
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bstream.readNumber(4); // external file attributes
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@ -233,7 +210,7 @@ var unzip = function(arrayBuffer) {
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info(" Found a Digital Signature");
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bstream.readNumber(4);
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var sizeOfSignature = bstream.readNumber(2);
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const sizeOfSignature = bstream.readNumber(2);
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bstream.readString(sizeOfSignature); // digital signature data
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}
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@ -243,8 +220,8 @@ var unzip = function(arrayBuffer) {
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}
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// now do the unzipping of each file
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for (var i = 0; i < localFiles.length; ++i) {
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var localfile = localFiles[i];
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for (let i = 0; i < localFiles.length; ++i) {
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const localfile = localFiles[i];
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// update progress
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currentFilename = localfile.filename;
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@ -275,13 +252,13 @@ function getHuffmanCodes(bitLengths) {
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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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MAX_BITS = 1;
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const numLengths = bitLengths.length;
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const bl_count = [];
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let 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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for (let i = 0; i < numLengths; ++i) {
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const length = 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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@ -296,10 +273,10 @@ function getHuffmanCodes(bitLengths) {
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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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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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const next_code = [];
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let code = 0;
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for (let bits = 1; bits <= MAX_BITS; ++bits) {
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const length = 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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@ -307,9 +284,10 @@ function getHuffmanCodes(bitLengths) {
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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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const table = {};
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let tableLength = 0;
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for (let n = 0; n < numLengths; ++n) {
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const 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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tableLength++;
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@ -338,16 +316,16 @@ function getHuffmanCodes(bitLengths) {
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11000111
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*/
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// fixed Huffman codes go from 7-9 bits, so we need an array whose index can hold up to 9 bits
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var fixedHCtoLiteral = null;
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var fixedHCtoDistance = null;
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let fixedHCtoLiteral = null;
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let fixedHCtoDistance = null;
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function getFixedLiteralTable() {
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// create once
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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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const bitlengths = new Array(288);
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for (let i = 0; i <= 143; ++i) bitlengths[i] = 8;
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for (let i = 144; i <= 255; ++i) bitlengths[i] = 9;
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for (let i = 256; i <= 279; ++i) bitlengths[i] = 7;
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for (let 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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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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const bitlengths = new Array(32);
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for (let i = 0; i < 32; ++i) { bitlengths[i] = 5; }
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// get huffman code table
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fixedHCtoDistance = getHuffmanCodes(bitlengths);
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@ -370,13 +348,14 @@ function getFixedDistanceTable() {
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// extract one bit at a time until we find a matching Huffman Code
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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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let code = 0;
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let len = 0;
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let match = false;
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// loop until we match
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for (;;) {
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// read in next bit
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var bit = bstream.readBits(1);
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const bit = bstream.readBits(1);
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code = (code<<1) | bit;
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++len;
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@ -394,7 +373,7 @@ function decodeSymbol(bstream, hcTable) {
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}
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var CodeLengthCodeOrder = [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15];
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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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@ -410,15 +389,15 @@ var CodeLengthCodeOrder = [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2
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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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var 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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[1,11], [1,13], [1,15], [1,17],
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[2,19], [2,23], [2,27], [2,31],
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[3,35], [3,43], [3,51], [3,59],
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[4,67], [4,83], [4,99], [4,115],
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[5,131], [5,163], [5,195], [5,227],
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[0,258]
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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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[1,11], [1,13], [1,15], [1,17],
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[2,19], [2,23], [2,27], [2,31],
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[3,35], [3,43], [3,51], [3,59],
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[4,67], [4,83], [4,99], [4,115],
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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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@ -435,7 +414,7 @@ var LengthLookupTable = [
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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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var DistLookupTable = [
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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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[2,9], [2,13],
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@ -468,9 +447,10 @@ function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
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stream, and copy length bytes from this
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position to the output stream.
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*/
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var numSymbols = 0, blockSize = 0;
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let numSymbols = 0;
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let blockSize = 0;
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for (;;) {
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var symbol = decodeSymbol(bstream, hcLiteralTable);
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const symbol = decodeSymbol(bstream, hcLiteralTable);
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++numSymbols;
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if (symbol < 256) {
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// copy literal byte to output
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@ -483,10 +463,10 @@ function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
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break;
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}
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else {
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var lengthLookup = LengthLookupTable[symbol-257],
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length = lengthLookup[1] + bstream.readBits(lengthLookup[0]),
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distLookup = DistLookupTable[decodeSymbol(bstream, hcDistanceTable)],
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distance = distLookup[1] + bstream.readBits(distLookup[0]);
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const lengthLookup = LengthLookupTable[symbol - 257];
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let length = lengthLookup[1] + bstream.readBits(lengthLookup[0]);
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const distLookup = DistLookupTable[decodeSymbol(bstream, hcDistanceTable)];
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let distance = distLookup[1] + bstream.readBits(distLookup[0]);
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// now apply length and distance appropriately and copy to output
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@ -499,10 +479,10 @@ function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
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// adds X,Y,X,Y,X to the output stream."
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//
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// loop for each character
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var ch = buffer.ptr - distance;
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let ch = buffer.ptr - distance;
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blockSize += length;
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if(length > distance) {
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var data = buffer.data;
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const data = buffer.data;
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while (length--) {
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buffer.insertByte(data[ch++]);
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}
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@ -520,27 +500,29 @@ function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
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// deflate: http://tools.ietf.org/html/rfc1951
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function inflate(compressedData, numDecompressedBytes) {
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// Bit stream representing the compressed data.
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var bstream = new bitjs.io.BitStream(compressedData.buffer,
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const bstream = new bitjs.io.BitStream(compressedData.buffer,
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false /* rtl */,
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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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const buffer = new bitjs.io.ByteBuffer(numDecompressedBytes);
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let numBlocks = 0;
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let blockSize = 0;
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// block format: http://tools.ietf.org/html/rfc1951#page-9
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let bFinal = 0;
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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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bFinal = bstream.readBits(1);
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let 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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if (bType == 0) {
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// skip remaining bits in this byte
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while (bstream.bitPtr != 0) bstream.readBits(1);
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var len = bstream.readBits(16),
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nlen = bstream.readBits(16);
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const len = bstream.readBits(16);
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const nlen = bstream.readBits(16);
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// TODO: check if nlen is the ones-complement of len?
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if(len > 0) buffer.insertBytes(bstream.readBytes(len));
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if (len > 0) buffer.insertBytes(bstream.readBytes(len));
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blockSize = len;
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}
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// fixed Huffman codes
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@ -549,18 +531,18 @@ function inflate(compressedData, numDecompressedBytes) {
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}
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// dynamic Huffman codes
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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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const numLiteralLengthCodes = bstream.readBits(5) + 257;
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const numDistanceCodes = bstream.readBits(5) + 1;
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const numCodeLengthCodes = bstream.readBits(4) + 4;
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// populate the array of code length codes (first de-compaction)
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var codeLengthsCodeLengths = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
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for (var i = 0; i < numCodeLengthCodes; ++i) {
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const codeLengthsCodeLengths = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
|
||||
for (let i = 0; i < numCodeLengthCodes; ++i) {
|
||||
codeLengthsCodeLengths[ CodeLengthCodeOrder[i] ] = bstream.readBits(3);
|
||||
}
|
||||
|
||||
// get the Huffman Codes for the code lengths
|
||||
var codeLengthsCodes = getHuffmanCodes(codeLengthsCodeLengths);
|
||||
const codeLengthsCodes = getHuffmanCodes(codeLengthsCodeLengths);
|
||||
|
||||
// now follow this mapping
|
||||
/*
|
||||
|
@ -578,28 +560,28 @@ function inflate(compressedData, numDecompressedBytes) {
|
|||
*/
|
||||
// to generate the true code lengths of the Huffman Codes for the literal
|
||||
// and distance tables together
|
||||
var literalCodeLengths = [];
|
||||
var prevCodeLength = 0;
|
||||
const literalCodeLengths = [];
|
||||
let prevCodeLength = 0;
|
||||
while (literalCodeLengths.length < numLiteralLengthCodes + numDistanceCodes) {
|
||||
var symbol = decodeSymbol(bstream, codeLengthsCodes);
|
||||
const symbol = decodeSymbol(bstream, codeLengthsCodes);
|
||||
if (symbol <= 15) {
|
||||
literalCodeLengths.push(symbol);
|
||||
prevCodeLength = symbol;
|
||||
}
|
||||
else if (symbol == 16) {
|
||||
var repeat = bstream.readBits(2) + 3;
|
||||
let repeat = bstream.readBits(2) + 3;
|
||||
while (repeat--) {
|
||||
literalCodeLengths.push(prevCodeLength);
|
||||
}
|
||||
}
|
||||
else if (symbol == 17) {
|
||||
var repeat = bstream.readBits(3) + 3;
|
||||
let repeat = bstream.readBits(3) + 3;
|
||||
while (repeat--) {
|
||||
literalCodeLengths.push(0);
|
||||
}
|
||||
}
|
||||
else if (symbol == 18) {
|
||||
var repeat = bstream.readBits(7) + 11;
|
||||
let repeat = bstream.readBits(7) + 11;
|
||||
while (repeat--) {
|
||||
literalCodeLengths.push(0);
|
||||
}
|
||||
|
@ -607,11 +589,11 @@ function inflate(compressedData, numDecompressedBytes) {
|
|||
}
|
||||
|
||||
// now split the distance code lengths out of the literal code array
|
||||
var distanceCodeLengths = literalCodeLengths.splice(numLiteralLengthCodes, numDistanceCodes);
|
||||
const distanceCodeLengths = literalCodeLengths.splice(numLiteralLengthCodes, numDistanceCodes);
|
||||
|
||||
// now generate the true Huffman Code tables using these code lengths
|
||||
var hcLiteralTable = getHuffmanCodes(literalCodeLengths),
|
||||
hcDistanceTable = getHuffmanCodes(distanceCodeLengths);
|
||||
const hcLiteralTable = getHuffmanCodes(literalCodeLengths);
|
||||
const hcDistanceTable = getHuffmanCodes(distanceCodeLengths);
|
||||
blockSize = inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer);
|
||||
}
|
||||
// error
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue