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Code cosmetics comic reader

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This commit is contained in:
OzzieIsaacs
2017-10-08 10:41:43 +02:00
parent 90729de87f
commit 1eb10be253
7 changed files with 270 additions and 262 deletions
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147
cps/static/js/unzip.js
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@ -9,7 +9,7 @@
* ZIP format: http://www.pkware.com/documents/casestudies/APPNOTE.TXT
* DEFLATE format: http://tools.ietf.org/html/rfc1951
*/
/* global bitjs */
/* global bitjs, importScripts, Uint8Array */
// This file expects to be invoked as a Worker (see onmessage below).
importScripts("io.js");
@ -44,12 +44,12 @@ var zLocalFileHeaderSignature = 0x04034b50;
var zArchiveExtraDataSignature = 0x08064b50;
var zCentralFileHeaderSignature = 0x02014b50;
var zDigitalSignatureSignature = 0x05054b50;
var zEndOfCentralDirSignature = 0x06064b50;
var zEndOfCentralDirLocatorSignature = 0x07064b50;
//var zEndOfCentralDirSignature = 0x06064b50;
//var zEndOfCentralDirLocatorSignature = 0x07064b50;
// takes a ByteStream and parses out the local file information
var ZipLocalFile = function(bstream) {
if (typeof bstream != typeof {} || !bstream.readNumber || typeof bstream.readNumber != typeof function(){}) {
if (typeof bstream !== typeof {} || !bstream.readNumber || typeof bstream.readNumber != typeof function() {} ) {
return null;
}
@ -100,7 +100,7 @@ var ZipLocalFile = function(bstream) {
// "This descriptor exists only if bit 3 of the general purpose bit flag is set"
// But how do you figure out how big the file data is if you don't know the compressedSize
// from the header?!?
if ((this.generalPurpose & bitjs.BIT[3]) != 0) {
if ((this.generalPurpose & bitjs.BIT[3]) !== 0) {
this.crc32 = bstream.readNumber(4);
this.compressedSize = bstream.readNumber(4);
this.uncompressedSize = bstream.readNumber(4);
@ -111,13 +111,13 @@ var ZipLocalFile = function(bstream) {
ZipLocalFile.prototype.unzip = function() {
// 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 (this.compressionMethod === 0 ) {
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) {
else if (this.compressionMethod === 8) {
info("ZIP v2.0, DEFLATE: " + this.filename + " (" + this.compressedSize + " bytes)");
this.fileData = inflate(this.fileData, this.uncompressedSize);
}
@ -144,10 +144,10 @@ var unzip = function(arrayBuffer) {
var bstream = new bitjs.io.ByteStream(arrayBuffer);
// detect local file header signature or return null
if (bstream.peekNumber(4) == zLocalFileHeaderSignature) {
if (bstream.peekNumber(4) === zLocalFileHeaderSignature) {
var localFiles = [];
// loop until we don't see any more local files
while (bstream.peekNumber(4) == zLocalFileHeaderSignature) {
while (bstream.peekNumber(4) === zLocalFileHeaderSignature) {
var oneLocalFile = new ZipLocalFile(bstream);
// this should strip out directories/folders
if (oneLocalFile && oneLocalFile.uncompressedSize > 0 && oneLocalFile.fileData) {
@ -158,14 +158,14 @@ var unzip = function(arrayBuffer) {
totalFilesInArchive = localFiles.length;
// got all local files, now sort them
localFiles.sort(function(a,b) {
localFiles.sort(function(a, b) {
var aname = a.filename.toLowerCase();
var bname = b.filename.toLowerCase();
return aname > bname ? 1 : -1;
});
// archive extra data record
if (bstream.peekNumber(4) == zArchiveExtraDataSignature) {
if (bstream.peekNumber(4) === zArchiveExtraDataSignature) {
info(" Found an Archive Extra Data Signature");
// skipping this record for now
@ -176,11 +176,11 @@ var unzip = function(arrayBuffer) {
// central directory structure
// TODO: handle the rest of the structures (Zip64 stuff)
if (bstream.peekNumber(4) == zCentralFileHeaderSignature) {
if (bstream.peekNumber(4) === zCentralFileHeaderSignature) {
info(" Found a Central File Header");
// read all file headers
while (bstream.peekNumber(4) == zCentralFileHeaderSignature) {
while (bstream.peekNumber(4) === zCentralFileHeaderSignature) {
bstream.readNumber(4); // signature
bstream.readNumber(2); // version made by
bstream.readNumber(2); // version needed to extract
@ -206,7 +206,7 @@ var unzip = function(arrayBuffer) {
}
// digital signature
if (bstream.peekNumber(4) == zDigitalSignatureSignature) {
if (bstream.peekNumber(4) === zDigitalSignatureSignature) {
info(" Found a Digital Signature");
bstream.readNumber(4);
@ -231,66 +231,66 @@ var unzip = function(arrayBuffer) {
// actually do the unzipping
localfile.unzip();
if (localfile.fileData != null) {
if (localfile.fileData !== null) {
postMessage(new bitjs.archive.UnarchiveExtractEvent(localfile));
postProgress();
}
}
postProgress();
postMessage(new bitjs.archive.UnarchiveFinishEvent());
}
}
}
};
// returns a table of Huffman codes
// each entry's index is its code and its value is a JavaScript object
// containing {length: 6, symbol: X}
function getHuffmanCodes(bitLengths) {
// ensure bitLengths is an array containing at least one element
if (typeof bitLengths != typeof [] || bitLengths.length < 1) {
if (typeof bitLengths !== typeof [] || bitLengths.length < 1) {
err("Error! getHuffmanCodes() called with an invalid array");
return null;
}
// Reference: http://tools.ietf.org/html/rfc1951#page-8
var numLengths = bitLengths.length,
bl_count = [],
blCount = [],
MAX_BITS = 1;
// Step 1: count up how many codes of each length we have
for (var i = 0; i < numLengths; ++i) {
var length = bitLengths[i];
var len = bitLengths[i];
// test to ensure each bit length is a positive, non-zero number
if (typeof length != typeof 1 || length < 0) {
err("bitLengths contained an invalid number in getHuffmanCodes(): " + length + " of type " + (typeof length));
if (typeof len !== typeof 1 || len < 0) {
err("bitLengths contained an invalid number in getHuffmanCodes(): " + len + " of type " + (typeof len));
return null;
}
// increment the appropriate bitlength count
if (bl_count[length] == undefined) bl_count[length] = 0;
if (blCount[len] === undefined) blCount[len] = 0;
// a length of zero means this symbol is not participating in the huffman coding
if (length > 0) bl_count[length]++;
if (len > 0) blCount[len]++;
if (length > MAX_BITS) MAX_BITS = length;
if (len > MAX_BITS) MAX_BITS = len;
}
// Step 2: Find the numerical value of the smallest code for each code length
var next_code = [],
var nextCode = [],
code = 0;
for (var bits = 1; bits <= MAX_BITS; ++bits) {
var length = bits-1;
var len = bits-1;
// ensure undefined lengths are zero
if (bl_count[length] == undefined) bl_count[length] = 0;
code = (code + bl_count[bits-1]) << 1;
next_code[bits] = code;
if (blCount[len] == undefined) blCount[len] = 0;
code = (code + blCount[bits-1]) << 1;
nextCode[bits] = code;
}
// Step 3: Assign numerical values to all codes
var table = {}, tableLength = 0;
for (var n = 0; n < numLengths; ++n) {
var len = bitLengths[n];
if (len != 0) {
table[next_code[len]] = { length: len, symbol: n }; //, bitstring: binaryValueToString(next_code[len],len) };
if (len !== 0) {
table[nextCode[len]] = { length: len, symbol: n }; //, bitstring: binaryValueToString(nextCode[len],len) };
tableLength++;
next_code[len]++;
nextCode[len]++;
}
}
table.maxLength = tableLength;
@ -322,9 +322,9 @@ function getFixedLiteralTable() {
if (!fixedHCtoLiteral) {
var bitlengths = new Array(288);
for (var i = 0; i <= 143; ++i) bitlengths[i] = 8;
for (i = 144; i <= 255; ++i) bitlengths[i] = 9;
for (i = 256; i <= 279; ++i) bitlengths[i] = 7;
for (i = 280; i <= 287; ++i) bitlengths[i] = 8;
for (var i = 144; i <= 255; ++i) bitlengths[i] = 9;
for (var i = 256; i <= 279; ++i) bitlengths[i] = 7;
for (var i = 280; i <= 287; ++i) bitlengths[i] = 8;
// get huffman code table
fixedHCtoLiteral = getHuffmanCodes(bitlengths);
@ -335,7 +335,9 @@ function getFixedDistanceTable() {
// create once
if (!fixedHCtoDistance) {
var bitlengths = new Array(32);
for (var i = 0; i < 32; ++i) { bitlengths[i] = 5; }
for (var i = 0; i < 32; ++i) {
bitlengths[i] = 5;
}
// get huffman code table
fixedHCtoDistance = getHuffmanCodes(bitlengths);
@ -347,7 +349,7 @@ function getFixedDistanceTable() {
// then return that symbol
function decodeSymbol(bstream, hcTable) {
var code = 0, len = 0;
var match = false;
// var match = false;
// loop until we match
for (;;) {
@ -389,14 +391,14 @@ var CodeLengthCodeOrder = [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2
*/
var LengthLookupTable = [
[0,3], [0,4], [0,5], [0,6],
[0,7], [0,8], [0,9], [0,10],
[1,11], [1,13], [1,15], [1,17],
[2,19], [2,23], [2,27], [2,31],
[3,35], [3,43], [3,51], [3,59],
[4,67], [4,83], [4,99], [4,115],
[5,131], [5,163], [5,195], [5,227],
[0,258]
[0, 3], [0, 4], [0, 5], [0, 6],
[0, 7], [0, 8], [0, 9], [0, 10],
[1, 11], [1, 13], [1, 15], [1, 17],
[2, 19], [2, 23], [2, 27], [2, 31],
[3, 35], [3, 43], [3, 51], [3, 59],
[4, 67], [4, 83], [4, 99], [4, 115],
[5, 131], [5, 163], [5, 195], [5, 227],
[0, 258]
];
/*
Extra Extra Extra
@ -414,20 +416,20 @@ var LengthLookupTable = [
9 3 25-32 19 8 769-1024 29 13 24577-32768
*/
var DistLookupTable = [
[0,1], [0,2], [0,3], [0,4],
[1,5], [1,7],
[2,9], [2,13],
[3,17], [3,25],
[4,33], [4,49],
[5,65], [5,97],
[6,129], [6,193],
[7,257], [7,385],
[8,513], [8,769],
[9,1025], [9,1537],
[10,2049], [10,3073],
[11,4097], [11,6145],
[12,8193], [12,12289],
[13,16385], [13,24577]
[0, 1], [0, 2], [0, 3], [0, 4],
[1, 5], [1, 7],
[2, 9], [2, 13],
[3, 17], [3, 25],
[4, 33], [4, 49],
[5, 65], [5, 97],
[6, 129], [6, 193],
[7, 257], [7, 385],
[8, 513], [8, 769],
[9, 1025], [9, 1537],
[10, 2049], [10, 3073],
[11, 4097], [11, 6145],
[12, 8193], [12, 12289],
[13, 16385], [13, 24577]
];
function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
@ -457,7 +459,7 @@ function inflateBlockData(bstream, hcLiteralTable, hcDistanceTable, buffer) {
}
else {
// end of block reached
if (symbol == 256) {
if (symbol === 256) {
break;
}
else {
@ -504,12 +506,13 @@ function inflate(compressedData, numDecompressedBytes) {
compressedData.byteOffset,
compressedData.byteLength);
var buffer = new bitjs.io.ByteBuffer(numDecompressedBytes);
var numBlocks = 0, blockSize = 0;
var numBlocks = 0;
var blockSize = 0;
// block format: http://tools.ietf.org/html/rfc1951#page-9
do {
var bFinal = bstream.readBits(1),
bType = bstream.readBits(2);
var bFinal = bstream.readBits(1);
var bType = bstream.readBits(2);
blockSize = 0;
++numBlocks;
// no compression
@ -524,17 +527,17 @@ 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) {
var numLiteralLengthCodes = bstream.readBits(5) + 257;
var numDistanceCodes = bstream.readBits(5) + 1,
numCodeLengthCodes = bstream.readBits(4) + 4;
// populate the array of code length codes (first de-compaction)
var codeLengthsCodeLengths = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
var codeLengthsCodeLengths = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
for (var i = 0; i < numCodeLengthCodes; ++i) {
codeLengthsCodeLengths[ CodeLengthCodeOrder[i] ] = bstream.readBits(3);
}
@ -566,19 +569,19 @@ function inflate(compressedData, numDecompressedBytes) {
literalCodeLengths.push(symbol);
prevCodeLength = symbol;
}
else if (symbol == 16) {
else if (symbol === 16) {
var repeat = bstream.readBits(2) + 3;
while (repeat--) {
literalCodeLengths.push(prevCodeLength);
}
}
else if (symbol == 17) {
else if (symbol === 17) {
var repeat = bstream.readBits(3) + 3;
while (repeat--) {
literalCodeLengths.push(0);
}
}
else if (symbol == 18) {
else if (symbol === 18) {
var repeat = bstream.readBits(7) + 11;
while (repeat--) {
literalCodeLengths.push(0);
@ -605,7 +608,7 @@ function inflate(compressedData, numDecompressedBytes) {
currentBytesUnarchived += blockSize;
postProgress();
} while (bFinal != 1);
} while (bFinal !== 1);
// we are done reading blocks if the bFinal bit was set for this block
// return the buffer data bytes