source: Dev/trunk/src/client/dojox/encoding/tests/compression/lzw.js

define(['doh', '../../compression/lzw', '../../bits'], function(doh, dcl, dcb){
        var msg1 = "The rain in Spain falls mainly on the plain.";
        var msg2 = "The rain in Spain falls mainly on the plain.1";
        var msg3 = "The rain in Spain falls mainly on the plain.ab";
        var msg4 = "The rain in Spain falls mainly on the plain.!@#";
        
        var s2b = function(s){
                var b = [];
                for(var i = 0; i < s.length; ++i){
                        b.push(s.charCodeAt(i));
                }
                return b;
        };

        var b2s = function(b){
                var s = [];
                dojo.forEach(b, function(c){ s.push(String.fromCharCode(c)); });
                return s.join("");
        };
        
        var encode = function(msg){
                var x = new dcb.OutputStream(), encoder = new dcl.Encoder(128);
                dojo.forEach(s2b(msg), function(v){ encoder.encode(v, x); });
                encoder.flush(x);
                console.debug("bits =", x.getWidth());
                return x.getBuffer();
        };
        
        var decode = function(n, buf){
                var x = new dcb.InputStream(buf, buf.length * 8), decoder = new dcl.Decoder(128), t = [], w = 0;
                while(w < n){
                        var v = decoder.decode(x);
                        t.push(v);
                        w += v.length;
                }
                return t.join("");
        };

        doh.register("dojox.encoding.tests.compression.lzw", [
                function testLzwMsg1(t){ t.assertEqual(msg1, decode(msg1.length, encode(msg1))); },
                function testLzwMsg2(t){ t.assertEqual(msg2, decode(msg2.length, encode(msg2))); },
                function testLzwMsg3(t){ t.assertEqual(msg3, decode(msg3.length, encode(msg3))); },
                function testLzwMsg4(t){ t.assertEqual(msg4, decode(msg4.length, encode(msg4))); }
        ]);
});