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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Source: compression/jxg.js</title>
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<div id="main">
<h1 class="page-title">Source: compression/jxg.js</h1>
<section>
<article>
<pre class="prettyprint source"><code>JXG = {
exists: (function(undefined) {
return function(v) {
return !(v === undefined || v === null);
};
})()
};
JXG.decompress = function(str) {
return unescape((new JXG.Util.Unzip(JXG.Util.Base64.decodeAsArray(str))).unzip()[0][0]);
};
/*
Copyright 2008-2012
Matthias Ehmann,
Michael Gerhaeuser,
Carsten Miller,
Bianca Valentin,
Alfred Wassermann,
Peter Wilfahrt
This file is part of JSXGraph.
Dual licensed under the Apache License Version 2.0, or LGPL Version 3 licenses.
You should have received a copy of the GNU Lesser General Public License
along with JSXCompressor. If not, see &lt;http://www.gnu.org/licenses/>.
You should have received a copy of the Apache License along with JSXCompressor.
If not, see &lt;http://www.apache.org/licenses/>.
*/
/**
* @class Util class
* @classdesc Utilities for uncompressing and base64 decoding
* Class for gunzipping, unzipping and base64 decoding of files.
* It is used for reading GEONExT, Geogebra and Intergeo files.
*
* Only Huffman codes are decoded in gunzip.
* The code is based on the source code for gunzip.c by Pasi Ojala
* {@link http://www.cs.tut.fi/~albert/Dev/gunzip/gunzip.c}
* {@link http://www.cs.tut.fi/~albert}
*/
JXG.Util = {};
/**
* Unzip zip files
*/
JXG.Util.Unzip = function(barray) {
var outputArr = [],
output = "",
debug = false,
gpflags,
files = 0,
unzipped = [],
crc,
buf32k = new Array(32768),
bIdx = 0,
modeZIP = false,
CRC, SIZE,
bitReverse = [
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
],
cplens = [
3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
],
cplext = [
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99
],
/* 99==invalid */
cpdist = [
0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0007, 0x0009, 0x000d,
0x0011, 0x0019, 0x0021, 0x0031, 0x0041, 0x0061, 0x0081, 0x00c1,
0x0101, 0x0181, 0x0201, 0x0301, 0x0401, 0x0601, 0x0801, 0x0c01,
0x1001, 0x1801, 0x2001, 0x3001, 0x4001, 0x6001
],
cpdext = [
0, 0, 0, 0, 1, 1, 2, 2,
3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10,
11, 11, 12, 12, 13, 13
],
border = [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15],
bA = barray,
bytepos = 0,
bitpos = 0,
bb = 1,
bits = 0,
NAMEMAX = 256,
nameBuf = [],
fileout;
function readByte() {
bits += 8;
if (bytepos &lt; bA.length) {
//if (debug)
// document.write(bytepos+": "+bA[bytepos]+"&lt;br>");
return bA[bytepos++];
} else
return -1;
}
function byteAlign() {
bb = 1;
}
function readBit() {
var carry;
bits++;
carry = (bb & 1);
bb >>= 1;
if (bb === 0) {
bb = readByte();
carry = (bb & 1);
bb = (bb >> 1) | 0x80;
}
return carry;
}
function readBits(a) {
var res = 0,
i = a;
while (i--) {
res = (res &lt;&lt; 1) | readBit();
}
if (a) {
res = bitReverse[res] >> (8 - a);
}
return res;
}
function flushBuffer() {
//document.write('FLUSHBUFFER:'+buf32k);
bIdx = 0;
}
function addBuffer(a) {
SIZE++;
//CRC=updcrc(a,crc);
buf32k[bIdx++] = a;
outputArr.push(String.fromCharCode(a));
//output+=String.fromCharCode(a);
if (bIdx == 0x8000) {
//document.write('ADDBUFFER:'+buf32k);
bIdx = 0;
}
}
function HufNode() {
this.b0 = 0;
this.b1 = 0;
this.jump = null;
this.jumppos = -1;
}
var LITERALS = 288;
var literalTree = new Array(LITERALS);
var distanceTree = new Array(32);
var treepos = 0;
var Places = null;
var Places2 = null;
var impDistanceTree = new Array(64);
var impLengthTree = new Array(64);
var len = 0;
var fpos = new Array(17);
fpos[0] = 0;
var flens;
var fmax;
function IsPat() {
while (1) {
if (fpos[len] >= fmax)
return -1;
if (flens[fpos[len]] == len)
return fpos[len]++;
fpos[len]++;
}
}
function Rec() {
var curplace = Places[treepos];
var tmp;
if (debug)
document.write("&lt;br>len:" + len + " treepos:" + treepos);
if (len == 17) { //war 17
return -1;
}
treepos++;
len++;
tmp = IsPat();
if (debug)
document.write("&lt;br>IsPat " + tmp);
if (tmp >= 0) {
curplace.b0 = tmp; /* leaf cell for 0-bit */
if (debug)
document.write("&lt;br>b0 " + curplace.b0);
} else {
/* Not a Leaf cell */
curplace.b0 = 0x8000;
if (debug)
document.write("&lt;br>b0 " + curplace.b0);
if (Rec())
return -1;
}
tmp = IsPat();
if (tmp >= 0) {
curplace.b1 = tmp; /* leaf cell for 1-bit */
if (debug)
document.write("&lt;br>b1 " + curplace.b1);
curplace.jump = null; /* Just for the display routine */
} else {
/* Not a Leaf cell */
curplace.b1 = 0x8000;
if (debug)
document.write("&lt;br>b1 " + curplace.b1);
curplace.jump = Places[treepos];
curplace.jumppos = treepos;
if (Rec())
return -1;
}
len--;
return 0;
}
function CreateTree(currentTree, numval, lengths, show) {
var i;
/* Create the Huffman decode tree/table */
//document.write("&lt;br>createtree&lt;br>");
if (debug)
document.write("currentTree " + currentTree + " numval " + numval + " lengths " + lengths + " show " + show);
Places = currentTree;
treepos = 0;
flens = lengths;
fmax = numval;
for (i = 0; i &lt; 17; i++)
fpos[i] = 0;
len = 0;
if (Rec()) {
//fprintf(stderr, "invalid huffman tree\n");
if (debug)
alert("invalid huffman tree\n");
return -1;
}
if (debug) {
document.write('&lt;br>Tree: ' + Places.length);
for (var a = 0; a &lt; 32; a++) {
document.write("Places[" + a + "].b0=" + Places[a].b0 + "&lt;br>");
document.write("Places[" + a + "].b1=" + Places[a].b1 + "&lt;br>");
}
}
/*if(show) {
var tmp;
for(tmp=currentTree;tmp&lt;Places;tmp++) {
fprintf(stdout, "0x%03x 0x%03x (0x%04x)",tmp-currentTree, tmp->jump?tmp->jump-currentTree:0,(tmp->jump?tmp->jump-currentTree:0)*6+0xcf0);
if(!(tmp.b0 & 0x8000)) {
//fprintf(stdout, " 0x%03x (%c)", tmp->b0,(tmp->b0&lt;256 && isprint(tmp->b0))?tmp->b0:'<27>');
}
if(!(tmp.b1 & 0x8000)) {
if((tmp.b0 & 0x8000))
fprintf(stdout, " ");
fprintf(stdout, " 0x%03x (%c)", tmp->b1,(tmp->b1&lt;256 && isprint(tmp->b1))?tmp->b1:'<27>');
}
fprintf(stdout, "\n");
}
}*/
return 0;
}
function DecodeValue(currentTree) {
var len, i,
xtreepos = 0,
X = currentTree[xtreepos],
b;
/* decode one symbol of the data */
while (1) {
b = readBit();
if (debug)
document.write("b=" + b);
if (b) {
if (!(X.b1 & 0x8000)) {
if (debug)
document.write("ret1");
return X.b1; /* If leaf node, return data */
}
X = X.jump;
len = currentTree.length;
for (i = 0; i &lt; len; i++) {
if (currentTree[i] === X) {
xtreepos = i;
break;
}
}
//xtreepos++;
} else {
if (!(X.b0 & 0x8000)) {
if (debug)
document.write("ret2");
return X.b0; /* If leaf node, return data */
}
//X++; //??????????????????
xtreepos++;
X = currentTree[xtreepos];
}
}
}
function DeflateLoop() {
var last, c, type, i, j, len, dist;
do {
/*if((last = readBit())){
fprintf(errfp, "Last Block: ");
} else {
fprintf(errfp, "Not Last Block: ");
}*/
last = readBit();
type = readBits(2);
switch (type) {
case 0:
if (debug)
alert("Stored\n");
break;
case 1:
if (debug)
alert("Fixed Huffman codes\n");
break;
case 2:
if (debug)
alert("Dynamic Huffman codes\n");
break;
case 3:
if (debug)
alert("Reserved block type!!\n");
break;
default:
if (debug)
alert("Unexpected value %d!\n", type);
break;
}
if (type === 0) {
var blockLen, cSum;
// Stored
byteAlign();
blockLen = readByte();
blockLen |= (readByte() &lt;&lt; 8);
cSum = readByte();
cSum |= (readByte() &lt;&lt; 8);
if (((blockLen ^ ~cSum) & 0xffff)) {
document.write("BlockLen checksum mismatch\n");
}
while (blockLen--) {
c = readByte();
addBuffer(c);
}
} else if (type == 1) {
/* Fixed Huffman tables -- fixed decode routine */
while (1) {
/*
256 0000000 0
: : :
279 0010111 23
0 00110000 48
: : :
143 10111111 191
280 11000000 192
: : :
287 11000111 199
144 110010000 400
: : :
255 111111111 511
Note the bit order!
*/
j = (bitReverse[readBits(7)] >> 1);
if (j > 23) {
j = (j &lt;&lt; 1) | readBit(); /* 48..255 */
if (j > 199) { /* 200..255 */
j -= 128; /* 72..127 */
j = (j &lt;&lt; 1) | readBit(); /* 144..255 &lt;&lt; */
} else { /* 48..199 */
j -= 48; /* 0..151 */
if (j > 143) {
j = j + 136; /* 280..287 &lt;&lt; */
/* 0..143 &lt;&lt; */
}
}
} else { /* 0..23 */
j += 256; /* 256..279 &lt;&lt; */
}
if (j &lt; 256) {
addBuffer(j);
//document.write("out:"+String.fromCharCode(j));
/*fprintf(errfp, "@%d %02x\n", SIZE, j);*/
} else if (j == 256) {
/* EOF */
break;
} else {
j -= 256 + 1; /* bytes + EOF */
len = readBits(cplext[j]) + cplens[j];
j = bitReverse[readBits(5)] >> 3;
if (cpdext[j] > 8) {
dist = readBits(8);
dist |= (readBits(cpdext[j] - 8) &lt;&lt; 8);
} else {
dist = readBits(cpdext[j]);
}
dist += cpdist[j];
/*fprintf(errfp, "@%d (l%02x,d%04x)\n", SIZE, len, dist);*/
for (j = 0; j &lt; len; j++) {
c = buf32k[(bIdx - dist) & 0x7fff];
addBuffer(c);
}
}
} // while
} else if (type == 2) {
var n, literalCodes, distCodes, lenCodes;
var ll = new Array(288 + 32); // "static" just to preserve stack
// Dynamic Huffman tables
literalCodes = 257 + readBits(5);
distCodes = 1 + readBits(5);
lenCodes = 4 + readBits(4);
//document.write("&lt;br>param: "+literalCodes+" "+distCodes+" "+lenCodes+"&lt;br>");
for (j = 0; j &lt; 19; j++) {
ll[j] = 0;
}
// Get the decode tree code lengths
//document.write("&lt;br>");
for (j = 0; j &lt; lenCodes; j++) {
ll[border[j]] = readBits(3);
//document.write(ll[border[j]]+" ");
}
//fprintf(errfp, "\n");
//document.write('&lt;br>ll:'+ll);
len = distanceTree.length;
for (i = 0; i &lt; len; i++)
distanceTree[i] = new HufNode();
if (CreateTree(distanceTree, 19, ll, 0)) {
flushBuffer();
return 1;
}
if (debug) {
document.write("&lt;br>distanceTree");
for (var a = 0; a &lt; distanceTree.length; a++) {
document.write("&lt;br>" + distanceTree[a].b0 + " " + distanceTree[a].b1 + " " + distanceTree[a].jump + " " +
distanceTree[a].jumppos);
/*if (distanceTree[a].jumppos!=-1)
document.write(" "+distanceTree[a].jump.b0+" "+distanceTree[a].jump.b1);
*/
}
}
//document.write('&lt;BR>tree created');
//read in literal and distance code lengths
n = literalCodes + distCodes;
i = 0;
var z = -1;
if (debug)
document.write("&lt;br>n=" + n + " bits: " + bits + "&lt;br>");
while (i &lt; n) {
z++;
j = DecodeValue(distanceTree);
if (debug)
document.write("&lt;br>" + z + " i:" + i + " decode: " + j + " bits " + bits + "&lt;br>");
if (j &lt; 16) { // length of code in bits (0..15)
ll[i++] = j;
} else if (j == 16) { // repeat last length 3 to 6 times
var l;
j = 3 + readBits(2);
if (i + j > n) {
flushBuffer();
return 1;
}
l = i ? ll[i - 1] : 0;
while (j--) {
ll[i++] = l;
}
} else {
if (j == 17) { // 3 to 10 zero length codes
j = 3 + readBits(3);
} else { // j == 18: 11 to 138 zero length codes
j = 11 + readBits(7);
}
if (i + j > n) {
flushBuffer();
return 1;
}
while (j--) {
ll[i++] = 0;
}
}
}
/*for(j=0; j&lt;literalCodes+distCodes; j++) {
//fprintf(errfp, "%d ", ll[j]);
if ((j&7)==7)
fprintf(errfp, "\n");
}
fprintf(errfp, "\n");*/
// Can overwrite tree decode tree as it is not used anymore
len = literalTree.length;
for (i = 0; i &lt; len; i++)
literalTree[i] = new HufNode();
if (CreateTree(literalTree, literalCodes, ll, 0)) {
flushBuffer();
return 1;
}
len = literalTree.length;
for (i = 0; i &lt; len; i++)
distanceTree[i] = new HufNode();
var ll2 = [];
for (i = literalCodes; i &lt; ll.length; i++) {
ll2[i - literalCodes] = ll[i];
}
if (CreateTree(distanceTree, distCodes, ll2, 0)) {
flushBuffer();
return 1;
}
if (debug)
document.write("&lt;br>literalTree");
outer: while (1) {
j = DecodeValue(literalTree);
if (j >= 256) { // In C64: if carry set
j -= 256;
if (j === 0) {
// EOF
break;
}
j--;
len = readBits(cplext[j]) + cplens[j];
j = DecodeValue(distanceTree);
if (cpdext[j] > 8) {
dist = readBits(8);
dist |= (readBits(cpdext[j] - 8) &lt;&lt; 8);
} else {
dist = readBits(cpdext[j]);
}
dist += cpdist[j];
while (len--) {
if (bIdx - dist &lt; 0) {
break outer;
}
c = buf32k[(bIdx - dist) & 0x7fff];
addBuffer(c);
}
} else {
addBuffer(j);
}
}
}
} while (!last);
flushBuffer();
byteAlign();
return 0;
}
JXG.Util.Unzip.prototype.unzipFile = function(name) {
var i;
this.unzip();
//alert(unzipped[0][1]);
for (i = 0; i &lt; unzipped.length; i++) {
if (unzipped[i][1] == name) {
return unzipped[i][0];
}
}
};
JXG.Util.Unzip.prototype.deflate = function() {
outputArr = [];
var tmp = [];
modeZIP = false;
DeflateLoop();
if (debug)
alert(outputArr.join(''));
unzipped[files] = new Array(2);
unzipped[files][0] = outputArr.join('');
unzipped[files][1] = "DEFLATE";
files++;
return unzipped;
};
JXG.Util.Unzip.prototype.unzip = function() {
//convertToByteArray(input);
if (debug)
alert(bA);
/*for (i=0;i&lt;bA.length*8;i++){
document.write(readBit());
if ((i+1)%8==0)
document.write(" ");
}*/
/*for (i=0;i&lt;bA.length;i++){
document.write(readByte()+" ");
if ((i+1)%8==0)
document.write(" ");
}
for (i=0;i&lt;bA.length;i++){
document.write(bA[i]+" ");
if ((i+1)%16==0)
document.write("&lt;br>");
}
*/
//alert(bA);
nextFile();
return unzipped;
};
function nextFile() {
if (debug)
alert("NEXTFILE");
outputArr = [];
var tmp = [];
modeZIP = false;
tmp[0] = readByte();
tmp[1] = readByte();
if (debug)
alert("type: " + tmp[0] + " " + tmp[1]);
if (tmp[0] == parseInt("78", 16) && tmp[1] == parseInt("da", 16)) { //GZIP
if (debug)
alert("GEONExT-GZIP");
DeflateLoop();
if (debug)
alert(outputArr.join(''));
unzipped[files] = new Array(2);
unzipped[files][0] = outputArr.join('');
unzipped[files][1] = "geonext.gxt";
files++;
}
if (tmp[0] == parseInt("78", 16) && tmp[1] == parseInt("9c", 16)) { //ZLIB
if (debug)
alert("ZLIB");
DeflateLoop();
if (debug)
alert(outputArr.join(''));
unzipped[files] = new Array(2);
unzipped[files][0] = outputArr.join('');
unzipped[files][1] = "ZLIB";
files++;
}
if (tmp[0] == parseInt("1f", 16) && tmp[1] == parseInt("8b", 16)) { //GZIP
if (debug)
alert("GZIP");
//DeflateLoop();
skipdir();
if (debug)
alert(outputArr.join(''));
unzipped[files] = new Array(2);
unzipped[files][0] = outputArr.join('');
unzipped[files][1] = "file";
files++;
}
if (tmp[0] == parseInt("50", 16) && tmp[1] == parseInt("4b", 16)) { //ZIP
modeZIP = true;
tmp[2] = readByte();
tmp[3] = readByte();
if (tmp[2] == parseInt("3", 16) && tmp[3] == parseInt("4", 16)) {
//MODE_ZIP
tmp[0] = readByte();
tmp[1] = readByte();
if (debug)
alert("ZIP-Version: " + tmp[1] + " " + tmp[0] / 10 + "." + tmp[0] % 10);
gpflags = readByte();
gpflags |= (readByte() &lt;&lt; 8);
if (debug)
alert("gpflags: " + gpflags);
var method = readByte();
method |= (readByte() &lt;&lt; 8);
if (debug)
alert("method: " + method);
readByte();
readByte();
readByte();
readByte();
var crc = readByte();
crc |= (readByte() &lt;&lt; 8);
crc |= (readByte() &lt;&lt; 16);
crc |= (readByte() &lt;&lt; 24);
var compSize = readByte();
compSize |= (readByte() &lt;&lt; 8);
compSize |= (readByte() &lt;&lt; 16);
compSize |= (readByte() &lt;&lt; 24);
var size = readByte();
size |= (readByte() &lt;&lt; 8);
size |= (readByte() &lt;&lt; 16);
size |= (readByte() &lt;&lt; 24);
if (debug)
alert("local CRC: " + crc + "\nlocal Size: " + size + "\nlocal CompSize: " + compSize);
var filelen = readByte();
filelen |= (readByte() &lt;&lt; 8);
var extralen = readByte();
extralen |= (readByte() &lt;&lt; 8);
if (debug)
alert("filelen " + filelen);
i = 0;
nameBuf = [];
var c;
while (filelen--) {
c = readByte();
if (c == "/" | c == ":") {
i = 0;
} else if (i &lt; NAMEMAX - 1)
nameBuf[i++] = String.fromCharCode(c);
}
if (debug)
alert("nameBuf: " + nameBuf);
//nameBuf[i] = "\0";
if (!fileout)
fileout = nameBuf;
var i = 0;
while (i &lt; extralen) {
c = readByte();
i++;
}
CRC = 0xffffffff;
SIZE = 0;
if (size === 0 && fileOut.charAt(fileout.length - 1) == "/") {
//skipdir
if (debug)
alert("skipdir");
}
if (method == 8) {
DeflateLoop();
if (debug)
alert(outputArr.join(''));
unzipped[files] = new Array(2);
unzipped[files][0] = outputArr.join('');
unzipped[files][1] = nameBuf.join('');
files++;
//return outputArr.join('');
}
skipdir();
}
}
}
function skipdir() {
var crc,
tmp = [],
compSize, size, os, i, c;
if ((gpflags & 8)) {
tmp[0] = readByte();
tmp[1] = readByte();
tmp[2] = readByte();
tmp[3] = readByte();
if (tmp[0] == parseInt("50", 16) &&
tmp[1] == parseInt("4b", 16) &&
tmp[2] == parseInt("07", 16) &&
tmp[3] == parseInt("08", 16)) {
crc = readByte();
crc |= (readByte() &lt;&lt; 8);
crc |= (readByte() &lt;&lt; 16);
crc |= (readByte() &lt;&lt; 24);
} else {
crc = tmp[0] | (tmp[1] &lt;&lt; 8) | (tmp[2] &lt;&lt; 16) | (tmp[3] &lt;&lt; 24);
}
compSize = readByte();
compSize |= (readByte() &lt;&lt; 8);
compSize |= (readByte() &lt;&lt; 16);
compSize |= (readByte() &lt;&lt; 24);
size = readByte();
size |= (readByte() &lt;&lt; 8);
size |= (readByte() &lt;&lt; 16);
size |= (readByte() &lt;&lt; 24);
if (debug)
alert("CRC:");
}
if (modeZIP)
nextFile();
tmp[0] = readByte();
if (tmp[0] != 8) {
if (debug)
alert("Unknown compression method!");
return 0;
}
gpflags = readByte();
if (debug) {
if ((gpflags & ~(parseInt("1f", 16))))
alert("Unknown flags set!");
}
readByte();
readByte();
readByte();
readByte();
readByte();
os = readByte();
if ((gpflags & 4)) {
tmp[0] = readByte();
tmp[2] = readByte();
len = tmp[0] + 256 * tmp[1];
if (debug)
alert("Extra field size: " + len);
for (i = 0; i &lt; len; i++)
readByte();
}
if ((gpflags & 8)) {
i = 0;
nameBuf = [];
while (c = readByte()) {
if (c == "7" || c == ":")
i = 0;
if (i &lt; NAMEMAX - 1)
nameBuf[i++] = c;
}
//nameBuf[i] = "\0";
if (debug)
alert("original file name: " + nameBuf);
}
if ((gpflags & 16)) {
while (c = readByte()) {
//FILE COMMENT
}
}
if ((gpflags & 2)) {
readByte();
readByte();
}
DeflateLoop();
crc = readByte();
crc |= (readByte() &lt;&lt; 8);
crc |= (readByte() &lt;&lt; 16);
crc |= (readByte() &lt;&lt; 24);
size = readByte();
size |= (readByte() &lt;&lt; 8);
size |= (readByte() &lt;&lt; 16);
size |= (readByte() &lt;&lt; 24);
if (modeZIP)
nextFile();
}
};
/**
* Base64 encoding / decoding
* {@link http://www.webtoolkit.info/}
*/
JXG.Util.Base64 = {
// private property
_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
// public method for encoding
encode: function(input) {
var output = [],
chr1, chr2, chr3, enc1, enc2, enc3, enc4,
i = 0;
input = JXG.Util.Base64._utf8_encode(input);
while (i &lt; input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) &lt;&lt; 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) &lt;&lt; 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output.push([this._keyStr.charAt(enc1),
this._keyStr.charAt(enc2),
this._keyStr.charAt(enc3),
this._keyStr.charAt(enc4)
].join(''));
}
return output.join('');
},
// public method for decoding
decode: function(input, utf8) {
var output = [],
chr1, chr2, chr3,
enc1, enc2, enc3, enc4,
i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i &lt; input.length) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 &lt;&lt; 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) &lt;&lt; 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) &lt;&lt; 6) | enc4;
output.push(String.fromCharCode(chr1));
if (enc3 != 64) {
output.push(String.fromCharCode(chr2));
}
if (enc4 != 64) {
output.push(String.fromCharCode(chr3));
}
}
output = output.join('');
if (utf8) {
output = JXG.Util.Base64._utf8_decode(output);
}
return output;
},
// private method for UTF-8 encoding
_utf8_encode: function(string) {
string = string.replace(/\r\n/g, "\n");
var utftext = "";
for (var n = 0; n &lt; string.length; n++) {
var c = string.charCodeAt(n);
if (c &lt; 128) {
utftext += String.fromCharCode(c);
} else if ((c > 127) && (c &lt; 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
} else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
// private method for UTF-8 decoding
_utf8_decode: function(utftext) {
var string = [],
i = 0,
c = 0,
c2 = 0,
c3 = 0;
while (i &lt; utftext.length) {
c = utftext.charCodeAt(i);
if (c &lt; 128) {
string.push(String.fromCharCode(c));
i++;
} else if ((c > 191) && (c &lt; 224)) {
c2 = utftext.charCodeAt(i + 1);
string.push(String.fromCharCode(((c & 31) &lt;&lt; 6) | (c2 & 63)));
i += 2;
} else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string.push(String.fromCharCode(((c & 15) &lt;&lt; 12) | ((c2 & 63) &lt;&lt; 6) | (c3 & 63)));
i += 3;
}
}
return string.join('');
},
_destrip: function(stripped, wrap) {
var lines = [],
lineno, i,
destripped = [];
if (wrap === null)
wrap = 76;
stripped.replace(/ /g, "");
lineno = stripped.length / wrap;
for (i = 0; i &lt; lineno; i++)
lines[i] = stripped.substr(i * wrap, wrap);
if (lineno != stripped.length / wrap)
lines[lines.length] = stripped.substr(lineno * wrap, stripped.length - (lineno * wrap));
for (i = 0; i &lt; lines.length; i++)
destripped.push(lines[i]);
return destripped.join('\n');
},
decodeAsArray: function(input) {
var dec = this.decode(input),
ar = [],
i;
for (i = 0; i &lt; dec.length; i++) {
ar[i] = dec.charCodeAt(i);
}
return ar;
},
decodeGEONExT: function(input) {
return decodeAsArray(destrip(input), false);
}
};
/**
* @private
*/
JXG.Util.asciiCharCodeAt = function(str, i) {
var c = str.charCodeAt(i);
if (c > 255) {
switch (c) {
case 8364:
c = 128;
break;
case 8218:
c = 130;
break;
case 402:
c = 131;
break;
case 8222:
c = 132;
break;
case 8230:
c = 133;
break;
case 8224:
c = 134;
break;
case 8225:
c = 135;
break;
case 710:
c = 136;
break;
case 8240:
c = 137;
break;
case 352:
c = 138;
break;
case 8249:
c = 139;
break;
case 338:
c = 140;
break;
case 381:
c = 142;
break;
case 8216:
c = 145;
break;
case 8217:
c = 146;
break;
case 8220:
c = 147;
break;
case 8221:
c = 148;
break;
case 8226:
c = 149;
break;
case 8211:
c = 150;
break;
case 8212:
c = 151;
break;
case 732:
c = 152;
break;
case 8482:
c = 153;
break;
case 353:
c = 154;
break;
case 8250:
c = 155;
break;
case 339:
c = 156;
break;
case 382:
c = 158;
break;
case 376:
c = 159;
break;
default:
break;
}
}
return c;
};
/**
* Decoding string into utf-8
* @param {String} string to decode
* @return {String} utf8 decoded string
*/
JXG.Util.utf8Decode = function(utftext) {
var string = [];
var i = 0;
var c = 0,
c1 = 0,
c2 = 0,
c3;
if (!JXG.exists(utftext)) return '';
while (i &lt; utftext.length) {
c = utftext.charCodeAt(i);
if (c &lt; 128) {
string.push(String.fromCharCode(c));
i++;
} else if ((c > 191) && (c &lt; 224)) {
c2 = utftext.charCodeAt(i + 1);
string.push(String.fromCharCode(((c & 31) &lt;&lt; 6) | (c2 & 63)));
i += 2;
} else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string.push(String.fromCharCode(((c & 15) &lt;&lt; 12) | ((c2 & 63) &lt;&lt; 6) | (c3 & 63)));
i += 3;
}
}
return string.join('');
};
/**
* Generate a random uuid.
* http://www.broofa.com
* mailto:robert@broofa.com
*
* Copyright (c) 2010 Robert Kieffer
* Dual licensed under the MIT and GPL licenses.
*
* EXAMPLES:
* >>> Math.uuid()
* "92329D39-6F5C-4520-ABFC-AAB64544E172"
*/
JXG.Util.genUUID = function() {
// Private array of chars to use
var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split(''),
uuid = new Array(36),
rnd = 0,
r;
for (var i = 0; i &lt; 36; i++) {
if (i == 8 || i == 13 || i == 18 || i == 23) {
uuid[i] = '-';
} else if (i == 14) {
uuid[i] = '4';
} else {
if (rnd &lt;= 0x02) rnd = 0x2000000 + (Math.random() * 0x1000000) | 0;
r = rnd & 0xf;
rnd = rnd >> 4;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
}
}
return uuid.join('');
};
module.exports = JXG;
</code></pre>
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