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Read a UTF16 String from a "byte" source

/ Published in: JavaScript
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This is useful if you have a string where each character represents a byte like the one returned by getStringAt() in BinaryAjax.

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  1. function readUTF16String(bytes, bigEndian) {
  2.     var ix = 0;
  3.     var offset1 = 1, offset2 = 0;
  4.     if( bytes.slice(0,2) == "\xFE\xFF") {
  5.         bigEndian = true;
  6.         ix = 2;
  7.     } else if( bytes.slice(0,2) == "\xFF\xFE") {
  8.         bigEndian = false;
  9.         ix = 2;
  10.     }
  11.  
  12.     if( bigEndian ) {
  13.         offset1 = 0;
  14.         offset2 = 1;
  15.     }
  16.  
  17.     var string = "";
  18.     for( ; ix < bytes.length; ix+=2 ) {
  19.         var byte1 = bytes[ix+offset1].charCodeAt(0);
  20.         var byte2 = bytes[ix+offset2].charCodeAt(0);
  21.         var word1 = (byte1<<8)+byte2;
  22.         if( byte1 < 0xD8 || byte1 >= 0xE0 ) {
  23.             string += String.fromCharCode(word1);
  24.         } else {
  25.             ix+=2;
  26.             var byte3 = bytes[ix+offset1].charCodeAt(0);
  27.             var byte4 = bytes[ix+offset2].charCodeAt(0);
  28.             var word2 = (byte3<<8)+byte4;
  29.             string += String.fromCharCode(word1, word2);
  30.         }
  31.     }
  32.  
  33.     return string;
  34. }

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