1 jls.loader.provide('jls.io.cs.SingleByteEncoder');
  2 
  3 jls.loader.require('jls.lang.ByteBuffer');
  4 
  5 jls.io.cs.SingleByteEncoder = jls.lang.Class.create( /** @lends jls.io.cs.SingleByteEncoder.prototype */
  6 {
  7     /**
  8      * Creates a character encoder.
  9      * 
 10      * @constructs
 11      * @class This class represents a single byte character set encoder.
 12      */
 13     initialize : function(charset, mapping) {
 14         this._charset = charset;
 15         this._mapping = mapping;
 16         this._averBytes = 1.0;
 17         this._replacement = '?'.charCodeAt(0);
 18     },
 19     /**
 20      * Encodes a string and returns a buffer.
 21      *
 22      * @param {jls.lang.CharBuffer} input The character buffer to encode.
 23      * @returns {jls.lang.Buffer} The encoded buffer.
 24      */
 25     encode : function(input, buffer) {
 26     	var length = Math.round(input.remaining() * this._averBytes);
 27     	var output = buffer || jls.lang.ByteBuffer.allocate(length + 1);
 28     	while (input.remaining() > 0) {
 29     		var c = input.getChar();
 30     		var b;
 31     		if (c in this._mapping) {
 32     			b = this._mapping[c];
 33     		} else {
 34     			b = this._replacement;
 35     		}
 36     		output.putByte(b);
 37     	}
 38         return output;
 39     }
 40 });
 41 
 42 Object.extend(jls.io.cs.SingleByteEncoder, /** @lends jls.io.cs.SingleByteEncoder */
 43 {
 44     reverseMapping : function(byteToCharCode) {
 45     	var charCodeToByte = [];
 46     	for (var i = 0; i < 256; i++) {
 47     		var cc = byteToCharCode[i];
 48     		if (cc != null) {
 49     			charCodeToByte[cc] = i;
 50     		} else {
 51     			delete byteToCharCode[i];
 52     		}
 53     	}
 54     	return charCodeToByte;
 55     }
 56 });