35 lines
3.4 KiB
JavaScript
35 lines
3.4 KiB
JavaScript
/*
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Copyright (c) 2004 Jan-Klaas Kollhof
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This file is part of the JavaScript o lait library(jsolait).
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jsolait is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This software is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this software; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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Module("codecs","0.1.2",function(mod){mod.listEncoders=function(){var c=[];for(var attr in String.prototype){if(attr.slice(0,7)=="encode_"){c.push(attr.slice(7));}}
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return c;}
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mod.listDecoders=function(){var c=[];for(var attr in String.prototype){if(attr.slice(0,7)=="decode_"){c.push(attr.slice(7));}}
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return c;}
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String.prototype.decode=function(codec){var n="decode_"+codec;if(String.prototype[n]){var args=[];for(var i=1;i<arguments.length;i++){args[i-1]=arguments[i];}
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return String.prototype[n].apply(this,args);}else{throw new mod.Exception("Decoder '%s' not found.".format(codec));}}
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String.prototype.encode=function(codec){var n="encode_"+codec;if(String.prototype[n]){var args=[];for(var i=1;i<arguments.length;i++){args[i-1]=arguments[i];}
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return String.prototype[n].apply(this,args);}else{throw new mod.Exception("Ecnoder '%s' not found.".format(codec));}}
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String.prototype.decode_base64=function(){if((this.length%4)==0){if(typeof(atob)!="undefined"){return atob(this);}else{var nBits;var sDecoded=new Array(this.length/4);var base64='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';for(var i=0;i<this.length;i+=4){nBits=(base64.indexOf(this.charAt(i))&0xff)<<18|(base64.indexOf(this.charAt(i+1))&0xff)<<12|(base64.indexOf(this.charAt(i+2))&0xff)<<6|base64.indexOf(this.charAt(i+3))&0xff;sDecoded[i]=String.fromCharCode((nBits&0xff0000)>>16,(nBits&0xff00)>>8,nBits&0xff);}
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sDecoded[sDecoded.length-1]=sDecoded[sDecoded.length-1].substring(0,3-((this.charCodeAt(i-2)==61)?2:(this.charCodeAt(i-1)==61?1:0)));return sDecoded.join("");}}else{throw new mod.Exception("String length must be divisible by 4.");}}
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String.prototype.encode_base64=function(){if(typeof(btoa)!="undefined"){return btoa(this);}else{var base64=['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/'];var sbin;var pad=0;var s=""+this;if((s.length%3)==1){s+=String.fromCharCode(0);s+=String.fromCharCode(0);pad=2;}else if((s.length%3)==2){s+=String.fromCharCode(0);pad=1;}
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var rslt=new Array(s.length/3);var ri=0;for(var i=0;i<s.length;i+=3){sbin=((s.charCodeAt(i)&0xff)<<16)|((s.charCodeAt(i+1)&0xff)<<8)|(s.charCodeAt(i+2)&0xff);rslt[ri]=(base64[(sbin>>18)&0x3f]+base64[(sbin>>12)&0x3f]+base64[(sbin>>6)&0x3f]+base64[sbin&0x3f]);ri++;}
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if(pad>0){rslt[rslt.length-1]=rslt[rslt.length-1].substr(0,4-pad)+((pad==2)?"==":(pad==1)?"=":"");}
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return rslt.join("");}}
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String.prototype.decode_uri=function(){return decodeURI(this);}
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String.prototype.encode_uri=function(){return encodeURI(this);}}) |