root / trunk / web / dojo / dojox / encoding / ascii85.js
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| 1 | 9 | andrej.cim | /*
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| 2 | Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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| 3 | Available via Academic Free License >= 2.1 OR the modified BSD license.
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| 4 | see: http://dojotoolkit.org/license for details
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| 5 | */
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| 6 | |||
| 7 | |||
| 8 | if(!dojo._hasResource["dojox.encoding.ascii85"]){ |
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| 9 | dojo._hasResource["dojox.encoding.ascii85"]=true; |
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| 10 | dojo.provide("dojox.encoding.ascii85");
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| 11 | (function(){
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| 12 | var c=function(_1,_2,_3){ |
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| 13 | var i,j,n,b=[0,0,0,0,0]; |
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| 14 | for(i=0;i<_2;i+=4){ |
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| 15 | n=((_1[i]*256+_1[i+1])*256+_1[i+2])*256+_1[i+3]; |
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| 16 | if(!n){
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| 17 | _3.push("z");
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| 18 | }else{
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| 19 | for(j=0;j<5;b[j++]=n%85+33,n=Math.floor(n/85)){ |
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| 20 | } |
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| 21 | } |
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| 22 | _3.push(String.fromCharCode(b[4],b[3],b[2],b[1],b[0])); |
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| 23 | } |
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| 24 | }; |
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| 25 | dojox.encoding.ascii85.encode=function(_4){ |
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| 26 | var _5=[],_6=_4.length%4,_7=_4.length-_6; |
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| 27 | c(_4,_7,_5); |
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| 28 | if(_6){
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| 29 | var t=_4.slice(_7);
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| 30 | while(t.length<4){ |
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| 31 | t.push(0);
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| 32 | } |
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| 33 | c(t,4,_5);
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| 34 | var x=_5.pop();
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| 35 | if(x=="z"){ |
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| 36 | x="!!!!!";
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| 37 | } |
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| 38 | _5.push(x.substr(0,_6+1)); |
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| 39 | } |
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| 40 | return _5.join(""); |
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| 41 | }; |
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| 42 | dojox.encoding.ascii85.decode=function(_8){ |
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| 43 | var n=_8.length,r=[],b=[0,0,0,0,0],i,j,t,x,y,d; |
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| 44 | for(i=0;i<n;++i){ |
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| 45 | if(_8.charAt(i)=="z"){ |
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| 46 | r.push(0,0,0,0); |
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| 47 | continue;
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| 48 | } |
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| 49 | for(j=0;j<5;++j){ |
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| 50 | b[j]=_8.charCodeAt(i+j)-33;
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| 51 | } |
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| 52 | d=n-i; |
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| 53 | if(d<5){ |
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| 54 | for(j=d;j<4;b[++j]=0){ |
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| 55 | } |
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| 56 | b[d]=85;
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| 57 | } |
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| 58 | t=(((b[0]*85+b[1])*85+b[2])*85+b[3])*85+b[4]; |
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| 59 | x=t&255;
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| 60 | t>>>=8;
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| 61 | y=t&255;
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| 62 | t>>>=8;
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| 63 | r.push(t>>>8,t&255,y,x); |
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| 64 | for(j=d;j<5;++j,r.pop()){ |
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| 65 | } |
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| 66 | i+=4;
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| 67 | } |
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| 68 | return r;
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| 69 | }; |
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| 70 | })(); |
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| 71 | } |