49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
'use strict';
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// Maps for number <-> hex string conversion
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var _byteToHex = [];
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var _hexToByte = {};
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for (var i = 0; i < 256; i++) {
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_byteToHex[i] = (i + 0x100).toString(16).substr(1);
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_hexToByte[_byteToHex[i]] = i;
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}
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// **`parse()` - Parse a UUID into it's component bytes**
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function parse(s, buf, offset) {
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var i = (buf && offset) || 0;
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var ii = 0;
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buf = buf || [];
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s.toLowerCase().replace(/[0-9a-f]{2}/g, function(oct) {
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if (ii < 16) { // Don't overflow!
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buf[i + ii++] = _hexToByte[oct];
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}
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});
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// Zero out remaining bytes if string was short
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while (ii < 16) {
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buf[i + ii++] = 0;
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}
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return buf;
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}
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// **`unparse()` - Convert UUID byte array (ala parse()) into a string**
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function unparse(buf, offset) {
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var i = offset || 0;
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var bth = _byteToHex;
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return bth[buf[i++]] + bth[buf[i++]] +
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bth[buf[i++]] + bth[buf[i++]] + '-' +
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bth[buf[i++]] + bth[buf[i++]] + '-' +
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bth[buf[i++]] + bth[buf[i++]] + '-' +
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bth[buf[i++]] + bth[buf[i++]] + '-' +
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bth[buf[i++]] + bth[buf[i++]] +
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bth[buf[i++]] + bth[buf[i++]] +
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bth[buf[i++]] + bth[buf[i++]];
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}
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module.exports = {
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parse: parse,
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unparse: unparse
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};
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