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<html>
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<head>
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<title>Compress colors</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<style type="text/css">
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@import "../../../dojo/resources/dojo.css";
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@import "../../../dijit/tests/css/dijitTests.css";
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.pane { margin-top: 2em; }
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</style>
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<script type="text/javascript" src="../../../dojo/dojo.js" djConfig="isDebug: true"></script>
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<script type="text/javascript">
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dojo.require("dojox.encoding.tests.colors");
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dojo.require("dojox.encoding.easy64");
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dojo.require("dojox.encoding.bits");
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dojo.require("dojox.encoding.splay");
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dojo.require("dojox.encoding.lzw");
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var dc = dojox.encoding, colors = dc.tests.colors;
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var run = function(){
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var empty = {}, names = [];
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for(var i in colors){
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if(i in empty){ continue; }
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names.push(i);
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}
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names.sort();
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var output = new dc.bits.OutputStream(), result = [];
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// encode names
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var s = names.join("{"), encoder = new dc.lzw.Encoder(27);
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result.push("<div>Input is " + s.length + " bytes long.</div>");
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result.push("<div>Input: " + s + ".</div>");
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for(var i = 0; i < s.length; ++i){
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var v = s.charCodeAt(i) - 97;
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if(v < 0 || v > 26) console.debug("error!", v);
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encoder.encode(v, output);
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}
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encoder.flush(output);
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var w = output.getWidth();
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result.push("<div>Output is " + Math.ceil(w / 8) + " bytes (" + w + " bits) long.</div>");
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var buf = output.getBuffer();
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{
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var input = new dc.bits.InputStream(buf, buf.length * 8), decoder = new dc.lzw.Decoder(27);
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var t = [];
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for(var w = 0; w < s.length;){
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var v = decoder.decode(input);
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t.push(v);
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w += v.length;
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}
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t = t.join("");
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var p = [];
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for(var i = 0; i < t.length; ++i){
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p.push(String.fromCharCode(t.charCodeAt(i) + 97));
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}
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p = p.join("");
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result.push("<div>Control: " + p + ".</div>");
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}
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while(buf.length % 3){ buf.push(0); }
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var e64 = dc.easy64.encode(buf);
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result.push("<div>Encoded output is " + e64.length + " bytes.</div>");
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result.push("<div><textarea>" + e64 + "</textarea></div>");
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// test
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{
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var buf = dc.easy64.decode(e64);
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var input = new dc.bits.InputStream(buf, buf.length * 8), decoder = new dc.lzw.Decoder(27);
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var t = [];
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for(var w = 0; w < s.length;){
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var v = decoder.decode(input);
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t.push(v);
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w += v.length;
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}
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t = t.join("");
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var p = [];
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for(var i = 0; i < t.length; ++i){
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p.push(String.fromCharCode(t.charCodeAt(i) + 97));
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}
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p = p.join("");
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result.push("<div>Control: " + p + ".</div>");
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}
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// encode values
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buf = [];
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for(var i = 0; i < names.length; ++i){
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var c = colors[names[i]];
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buf.push(c[0], c[1], c[2]);
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}
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result.push("<div>Output is " + buf.length + " bytes long.</div>");
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while(buf.length % 4){ buf.push(0); }
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e64 = dc.easy64.encode(buf);
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result.push("<div>Encoded output is " + e64.length + " bytes.</div>");
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result.push("<div><textarea>" + e64 + "</textarea></div>");
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dojo.byId("status").innerHTML = result.join("\n");
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};
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dojo.addOnLoad(function(){
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dojo.connect(dojo.byId("run"), "onclick", run);
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});
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</script>
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</head>
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<body>
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<h1>Compress colors</h1>
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<p><button id="run">Run</button></p>
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<div id="status" class="pane"><em>No status yet.</em></div>
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</body>
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</html>
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