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Add logging as a parameter (used in unzip.js). Add a TODO for unrar.js to use a ByteStream for the file headers

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codedread 2018-01-29 22:06:54 -08:00
parent 950dc65b56
commit b04e638c93
4 changed files with 47 additions and 22 deletions
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54
archive/unzip.js
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@ -29,6 +29,7 @@ const UnarchiveState = {
let unarchiveState = UnarchiveState.NOT_STARTED;
let bytestream = null;
let allLocalFiles = null;
let logToConsole = false;
// Progress variables.
let currentFilename = "";
@ -118,31 +119,37 @@ class ZipLocalFile {
}
// Now that we have all the bytes for this file, we can print out some information.
info("Zip Local File Header:");
info(" version=" + this.version);
info(" general purpose=" + this.generalPurpose);
info(" compression method=" + this.compressionMethod);
info(" last mod file time=" + this.lastModFileTime);
info(" last mod file date=" + this.lastModFileDate);
info(" crc32=" + this.crc32);
info(" compressed size=" + this.compressedSize);
info(" uncompressed size=" + this.uncompressedSize);
info(" file name length=" + this.fileNameLength);
info(" extra field length=" + this.extraFieldLength);
info(" filename = '" + this.filename + "'");
if (logToConsole) {
info("Zip Local File Header:");
info(" version=" + this.version);
info(" general purpose=" + this.generalPurpose);
info(" compression method=" + this.compressionMethod);
info(" last mod file time=" + this.lastModFileTime);
info(" last mod file date=" + this.lastModFileDate);
info(" crc32=" + this.crc32);
info(" compressed size=" + this.compressedSize);
info(" uncompressed size=" + this.uncompressedSize);
info(" file name length=" + this.fileNameLength);
info(" extra field length=" + this.extraFieldLength);
info(" filename = '" + this.filename + "'");
}
}
// determine what kind of compressed data we have and decompress
unzip() {
// Zip Version 1.0, no compression (store only)
if (this.compressionMethod == 0 ) {
info("ZIP v"+this.version+", store only: " + this.filename + " (" + this.compressedSize + " bytes)");
if (logToConsole) {
info("ZIP v"+this.version+", store only: " + this.filename + " (" + this.compressedSize + " bytes)");
}
currentBytesUnarchivedInFile = this.compressedSize;
currentBytesUnarchived += this.compressedSize;
}
// version == 20, compression method == 8 (DEFLATE)
else if (this.compressionMethod == 8) {
info("ZIP v2.0, DEFLATE: " + this.filename + " (" + this.compressedSize + " bytes)");
if (logToConsole) {
info("ZIP v2.0, DEFLATE: " + this.filename + " (" + this.compressedSize + " bytes)");
}
this.fileData = inflate(this.fileData, this.uncompressedSize);
}
else {
@ -415,7 +422,6 @@ function inflate(compressedData, numDecompressedBytes) {
compressedData.byteOffset,
compressedData.byteLength);
const buffer = new bitjs.io.ByteBuffer(numDecompressedBytes);
let numBlocks = 0;
let blockSize = 0;
// block format: http://tools.ietf.org/html/rfc1951#page-9
@ -424,7 +430,6 @@ function inflate(compressedData, numDecompressedBytes) {
bFinal = bstream.readBits(1);
let bType = bstream.readBits(2);
blockSize = 0;
++numBlocks;
// no compression
if (bType == 0) {
// skip remaining bits in this byte
@ -436,11 +441,11 @@ function inflate(compressedData, numDecompressedBytes) {
blockSize = len;
}
// fixed Huffman codes
else if(bType == 1) {
else if (bType == 1) {
blockSize = inflateBlockData(bstream, getFixedLiteralTable(), getFixedDistanceTable(), buffer);
}
// dynamic Huffman codes
else if(bType == 2) {
else if (bType == 2) {
const numLiteralLengthCodes = bstream.readBits(5) + 257;
const numDistanceCodes = bstream.readBits(5) + 1;
const numCodeLengthCodes = bstream.readBits(4) + 4;
@ -551,7 +556,9 @@ function unzip() {
// archive extra data record
if (bstream.peekNumber(4) == zArchiveExtraDataSignature) {
info(" Found an Archive Extra Data Signature");
if (logToConsole) {
info(" Found an Archive Extra Data Signature");
}
// skipping this record for now
bstream.readNumber(4);
@ -562,7 +569,9 @@ function unzip() {
// central directory structure
// TODO: handle the rest of the structures (Zip64 stuff)
if (bytestream.peekNumber(4) == zCentralFileHeaderSignature) {
info(" Found a Central File Header");
if (logToConsole) {
info(" Found a Central File Header");
}
// read all file headers
while (bstream.peekNumber(4) == zCentralFileHeaderSignature) {
@ -592,7 +601,9 @@ function unzip() {
// digital signature
if (bstream.peekNumber(4) == zDigitalSignatureSignature) {
info(" Found a Digital Signature");
if (logToConsole) {
info(" Found a Digital Signature");
}
bstream.readNumber(4);
const sizeOfSignature = bstream.readNumber(2);
@ -608,6 +619,7 @@ function unzip() {
// event.data.bytes has all subsequent ArrayBuffers.
onmessage = function(event) {
const bytes = event.data.file || event.data.bytes;
logToConsole = !!event.data.logToConsole;
// This is the very first time we have been called. Initialize the bytestream.
if (!bytestream) {