asciiblaster

- draw irc art in your web browser
git clone git://git.acid.vegas/asciiblaster.git
dataUriToBlob.js (1116B)
      1 var dataUriToUint8Array = function(uri){
      2   var data = uri.split(',')[1];
      3   var bytes = atob(data);
      4   var buf = new ArrayBuffer(bytes.length);
      5   var u8 = new Uint8Array(buf);
      6   for (var i = 0; i < bytes.length; i++) {
      7     u8[i] = bytes.charCodeAt(i);
      8   }
      9   return u8 
     10 }
     11 
     12 window.dataUriToBlob = (function(){
     13 /**
     14  * Blob constructor.
     15  */
     16 
     17 var Blob = window.Blob;
     18 
     19 /**
     20  * ArrayBufferView support.
     21  */
     22 
     23 var hasArrayBufferView = new Blob([new Uint8Array(100)]).size == 100;
     24 
     25 /**
     26  * Return a `Blob` for the given data `uri`.
     27  *
     28  * @param {String} uri
     29  * @return {Blob}
     30  * @api public
     31  */
     32 
     33 var dataUriToBlob = function(uri){
     34   var data = uri.split(',')[1];
     35   var bytes = atob(data);
     36   var buf = new ArrayBuffer(bytes.length);
     37   var arr = new Uint8Array(buf);
     38   for (var i = 0; i < bytes.length; i++) {
     39     arr[i] = bytes.charCodeAt(i);
     40   }
     41 
     42   if (!hasArrayBufferView) arr = buf;
     43   var blob = new Blob([arr], { type: mime(uri) });
     44   blob.slice = blob.slice || blob.webkitSlice;
     45   return blob;
     46 };
     47 
     48 /**
     49  * Return data uri mime type.
     50  */
     51 
     52 function mime(uri) {
     53   return uri.split(';')[0].slice(5);
     54 }
     55 
     56 return dataUriToBlob;
     57 
     58 })()