93 lines
2.4 KiB
HTML
93 lines
2.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Examples - CRC32</title>
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</head>
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<body>
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<h1>Buffer</h1>
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<a href="index.html">List</a> - <a href="crc32.py.html">Source</a> - <a href="crc32.wat.html">WebAssembly</a>
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<div style="white-space: pre;" id="results"></div>
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<script type="text/javascript" src="./include.js"></script>
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<script type="text/javascript">
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let importObject = {};
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// Build up a JS version
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var makeCRCTable = function(){
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var c;
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var crcTable = [];
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for(var n =0; n < 256; n++){
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c = n;
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for(var k =0; k < 8; k++){
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c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
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}
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crcTable[n] = c;
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}
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return crcTable;
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}
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window.crcTable = makeCRCTable();
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var crc32_js = function(i8arr) {
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var crcTable = window.crcTable;
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var crc = 0 ^ (-1);
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for (var i = 0; i < i8arr.length; i++ ) {
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crc = (crc >>> 8) ^ crcTable[(crc ^ i8arr[i]) & 0xFF];
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}
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return (crc ^ (-1)) >>> 0;
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};
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// Run a single test
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function run_test(app, str)
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{
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// Cast to Uint32 in Javascript
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let crc32_wasm = (offset) => (app.instance.exports.crc32(offset) >>> 0);
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let data = Uint8Array.from(str.split('').map(x => x.charCodeAt()));
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offset = alloc_bytes(app, data);
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// Run once to get the result
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// For some reason, the JS version takes 2ms on the first run
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let wasm_result = crc32_wasm(offset);
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let js_result = crc32_js(data);
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let wasm_time = run_times(100, () => crc32_wasm(offset));
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let js_time = run_times(100, () => crc32_js(data));
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test_result((js_result == wasm_result) && ((js_time == 0) || (wasm_time < js_time)), {
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'summary': 'crc32(' + (str
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? (str.length < 64 ? '"' + str + '"' : '"' + str.substring(0, 64) + '..." (' + str.length + ')')
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: '""') + ')',
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'attributes': {
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'str': str,
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'wasm_result': wasm_result,
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'wasm_time': wasm_time,
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'js_result': js_result,
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'js_time': js_time,
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'speedup': (js_time == wasm_time) ? '-' : (js_time / wasm_time),
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},
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});
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}
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// Load WebAssembly, and run all tests
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WebAssembly.instantiateStreaming(fetch('crc32.wasm'), importObject)
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.then(app => {
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run_test(app, "");
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run_test(app, "a");
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run_test(app, "Z");
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run_test(app, "ab");
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run_test(app, "abcdefghijklmnopqrstuvwxyz");
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run_test(app, "The quick brown fox jumps over the lazy dog");
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run_test(app, "The quick brown fox jumps over the lazy dog".repeat(1024)); // FIXME: Too slow :(
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});
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</script>
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</body>
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</html>
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