Created
November 21, 2012 11:20
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CRC32 Tests NodeJS/PHP
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| var crc32 = require('buffer-crc32'); // npm install buffer-crc32; | |
| var crc = require('crc'); // npm install crc | |
| var str = "Hello CRC"; | |
| var strUTF8= "<!DOCTYPE html>\n<html>\n<head>\n</head>\n<body><p>自動販売</p></body></html>"; | |
| var bufUTF8 = new Buffer(strUTF8); | |
| var bufStr = new Buffer(str); | |
| // Example 1 | |
| console.log("Buffer CRC32 implementation:") | |
| console.log('Example 1 bufUTF8 (signed): '+crc32.signed(bufUTF8 )); // returns 1395090196 | |
| console.log('Example 1 strUTF8 (signed): '+crc32.signed(strUTF8)); // returns 1395090196 | |
| console.log('Example 1 bufUTF8 (unsigned): '+crc32.unsigned(bufUTF8 )); // returns 1395090196 | |
| console.log('Example 1 strUTF8 (unsigned): '+crc32.unsigned(strUTF8)); // returns 1395090196 | |
| console.log(""); | |
| console.log("Current express dependency (node-crc):"); | |
| console.log('Example 1 strUTF8 (unsigned):'+ crc.crc32(strUTF8)); // return -81823478 | |
| console.log('Example 1 bufUTF8 (unsigned):'+ crc.crc32(bufUTF8.toString())); // returns -81823478 | |
| console.log("\n"); | |
| console.log("Buffer CRC32 implementation:") | |
| console.log("Example 2 bufStr (unsigned): "+crc32.unsigned(bufStr)); // returns -2034458343 | |
| console.log("Example 2 str (unsigned): "+crc32.unsigned(str)); // returns -2034458343 | |
| console.log(""); | |
| console.log("Current express dependency (node-crc):"); | |
| console.log("Example 2 str (unsigned): "+crc.crc32(str)); // return -2034458343 | |
| console.log("Example 2 str (unsigned): "+crc.crc32(bufStr.toString())); // returns -2034458343 |
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| <?php | |
| echo crc32("<!DOCTYPE html>\n<html>\n<head>\n</head>\n<body><p>自動販売</p></body></html>").PHP_EOL; | |
| // returns 1395090196 | |
| echo crc32("Hello CRC").PHP_EOL; | |
| // returns 2260508953 |
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I tested with buffer-crc32, and for the Example 2 str/bufStr I got the same return value as PHP (and not, as your comments suggest, a different signed number). I guess a faulty comment here?