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lzw.js
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lzw.js
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if(!dojo._hasResource["dojox.encoding.tests.lzw"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.encoding.tests.lzw"] = true;
dojo.provide("dojox.encoding.tests.lzw");
dojo.require("dojox.encoding.lzw");
dojo.require("dojox.encoding.bits");
(function(){
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 dc = dojox.encoding, dcb = dc.bits, dcl = dc.lzw;
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("");
};
tests.register("dojox.encoding.tests.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))); }
]);
})();
}

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