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<h1 class="page-title">Source: compression/zlib/jsxcompressor.js</h1>
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<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 <http://www.gnu.org/licenses/>.
You should have received a copy of the Apache License along with JSXCompressor.
If not, see <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<bA.length){
//if (debug)
// document.write(bytepos+": "+bA[bytepos]+"<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<<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("<br>len:"+len+" treepos:"+treepos);
if(len==17) { //war 17
return -1;
}
treepos++;
len++;
tmp = IsPat();
if (debug)
document.write("<br>IsPat "+tmp);
if(tmp >= 0) {
curplace.b0 = tmp; /* leaf cell for 0-bit */
if (debug)
document.write("<br>b0 "+curplace.b0);
} else {
/* Not a Leaf cell */
curplace.b0 = 0x8000;
if (debug)
document.write("<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("<br>b1 "+curplace.b1);
curplace.jump = null; /* Just for the display routine */
} else {
/* Not a Leaf cell */
curplace.b1 = 0x8000;
if (debug)
document.write("<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("<br>createtree<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<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('<br>Tree: '+Places.length);
for (var a=0;a<32;a++){
document.write("Places["+a+"].b0="+Places[a].b0+"<br>");
document.write("Places["+a+"].b1="+Places[a].b1+"<br>");
}
}
/*if(show) {
var tmp;
for(tmp=currentTree;tmp<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<256 && isprint(tmp->b0))?tmp->b0:'�');
}
if(!(tmp.b1 & 0x8000)) {
if((tmp.b0 & 0x8000))
fprintf(stdout, " ");
fprintf(stdout, " 0x%03x (%c)", tmp->b1,(tmp->b1<256 && isprint(tmp->b1))?tmp->b1:'�');
}
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<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];
}
}
if (debug)
document.write("ret3");
return -1;
};
function DeflateLoop() {
var last, c, type, i, len;
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()<<8);
cSum = readByte();
cSum |= (readByte()<<8);
if(((blockLen ^ ~cSum) & 0xffff)) {
document.write("BlockLen checksum mismatch\n");
}
while(blockLen--) {
c = readByte();
addBuffer(c);
}
} else if(type==1) {
var j;
/* 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<<1) | readBit(); /* 48..255 */
if(j > 199) { /* 200..255 */
j -= 128; /* 72..127 */
j = (j<<1) | readBit(); /* 144..255 << */
} else { /* 48..199 */
j -= 48; /* 0..151 */
if(j > 143) {
j = j+136; /* 280..287 << */
/* 0..143 << */
}
}
} else { /* 0..23 */
j += 256; /* 256..279 << */
}
if(j < 256) {
addBuffer(j);
//document.write("out:"+String.fromCharCode(j));
/*fprintf(errfp, "@%d %02x\n", SIZE, j);*/
} else if(j == 256) {
/* EOF */
break;
} else {
var len, dist;
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)<<8);
} else {
dist = readBits(cpdext[j]);
}
dist += cpdist[j];
/*fprintf(errfp, "@%d (l%02x,d%04x)\n", SIZE, len, dist);*/
for(j=0;j<len;j++) {
var c = buf32k[(bIdx - dist) & 0x7fff];
addBuffer(c);
}
}
} // while
} else if(type==2) {
var j, 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("<br>param: "+literalCodes+" "+distCodes+" "+lenCodes+"<br>");
for(j=0; j<19; j++) {
ll[j] = 0;
}
// Get the decode tree code lengths
//document.write("<br>");
for(j=0; j<lenCodes; j++) {
ll[border[j]] = readBits(3);
//document.write(ll[border[j]]+" ");
}
//fprintf(errfp, "\n");
//document.write('<br>ll:'+ll);
len = distanceTree.length;
for (i=0; i<len; i++)
distanceTree[i]=new HufNode();
if(CreateTree(distanceTree, 19, ll, 0)) {
flushBuffer();
return 1;
}
if (debug){
document.write("<br>distanceTree");
for(var a=0;a<distanceTree.length;a++){
document.write("<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('<BR>tree created');
//read in literal and distance code lengths
n = literalCodes + distCodes;
i = 0;
var z=-1;
if (debug)
document.write("<br>n="+n+" bits: "+bits+"<br>");
while(i < n) {
z++;
j = DecodeValue(distanceTree);
if (debug)
document.write("<br>"+z+" i:"+i+" decode: "+j+" bits "+bits+"<br>");
if(j<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<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<len; i++)
literalTree[i]=new HufNode();
if(CreateTree(literalTree, literalCodes, ll, 0)) {
flushBuffer();
return 1;
}
len = literalTree.length;
for (i=0; i<len; i++)
distanceTree[i]=new HufNode();
var ll2 = new Array();
for (i=literalCodes; i <ll.length; i++){
ll2[i-literalCodes]=ll[i];
}
if(CreateTree(distanceTree, distCodes, ll2, 0)) {
flushBuffer();
return 1;
}
if (debug)
document.write("<br>literalTree");
outer:
while(1) {
j = DecodeValue(literalTree);
if(j >= 256) { // In C64: if carry set
var len, dist;
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)<<8);
} else {
dist = readBits(cpdext[j]);
}
dist += cpdist[j];
while(len--) {
if(bIdx - dist < 0) {
break outer;
}
var 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<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<bA.length*8;i++){
document.write(readBit());
if ((i+1)%8==0)
document.write(" ");
}*/
/*for (i=0;i<bA.length;i++){
document.write(readByte()+" ");
if ((i+1)%8==0)
document.write(" ");
}
for (i=0;i<bA.length;i++){
document.write(bA[i]+" ");
if ((i+1)%16==0)
document.write("<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()<<8);
if (debug)
alert("gpflags: "+gpflags);
var method = readByte();
method |= (readByte()<<8);
if (debug)
alert("method: "+method);
readByte();
readByte();
readByte();
readByte();
var crc = readByte();
crc |= (readByte()<<8);
crc |= (readByte()<<16);
crc |= (readByte()<<24);
var compSize = readByte();
compSize |= (readByte()<<8);
compSize |= (readByte()<<16);
compSize |= (readByte()<<24);
var size = readByte();
size |= (readByte()<<8);
size |= (readByte()<<16);
size |= (readByte()<<24);
if (debug)
alert("local CRC: "+crc+"\nlocal Size: "+size+"\nlocal CompSize: "+compSize);
var filelen = readByte();
filelen |= (readByte()<<8);
var extralen = readByte();
extralen |= (readByte()<<8);
if (debug)
alert("filelen "+filelen);
i = 0;
nameBuf = [];
while (filelen--){
var c = readByte();
if (c == "/" | c ==":"){
i = 0;
} else if (i < NAMEMAX-1)
nameBuf[i++] = String.fromCharCode(c);
}
if (debug)
alert("nameBuf: "+nameBuf);
//nameBuf[i] = "\0";
if (!fileout)
fileout = nameBuf;
var i = 0;
while (i < 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()<<8);
crc |= (readByte()<<16);
crc |= (readByte()<<24);
} else {
crc = tmp[0] | (tmp[1]<<8) | (tmp[2]<<16) | (tmp[3]<<24);
}
compSize = readByte();
compSize |= (readByte()<<8);
compSize |= (readByte()<<16);
compSize |= (readByte()<<24);
size = readByte();
size |= (readByte()<<8);
size |= (readByte()<<16);
size |= (readByte()<<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<len;i++)
readByte();
}
if ((gpflags & 8)){
i=0;
nameBuf=[];
while (c=readByte()){
if(c == "7" || c == ":")
i=0;
if (i<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()<<8);
crc |= (readByte()<<16);
crc |= (readByte()<<24);
size = readByte();
size |= (readByte()<<8);
size |= (readByte()<<16);
size |= (readByte()<<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 < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 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 < 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 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 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 < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if((c > 127) && (c < 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 < utftext.length ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string.push(String.fromCharCode(c));
i++;
}
else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string.push(String.fromCharCode(((c & 31) << 6) | (c2 & 63)));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string.push(String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 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 < 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 < 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<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 < utftext.length ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string.push(String.fromCharCode(c));
i++;
} else if((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string.push(String.fromCharCode(((c & 31) << 6) | (c2 & 63)));
i += 2;
} else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string.push(String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 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 < 36; i++) {
if (i==8 || i==13 || i==18 || i==23) {
uuid[i] = '-';
} else if (i==14) {
uuid[i] = '4';
} else {
if (rnd <= 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('');
};
</code></pre>
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