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57 lines
1.6 KiB
57 lines
1.6 KiB
var bytesToUuid = require('./bytesToUuid'); |
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function uuidToBytes(uuid) { |
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// Note: We assume we're being passed a valid uuid string |
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var bytes = []; |
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uuid.replace(/[a-fA-F0-9]{2}/g, function(hex) { |
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bytes.push(parseInt(hex, 16)); |
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}); |
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return bytes; |
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} |
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function stringToBytes(str) { |
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str = unescape(encodeURIComponent(str)); // UTF8 escape |
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var bytes = new Array(str.length); |
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for (var i = 0; i < str.length; i++) { |
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bytes[i] = str.charCodeAt(i); |
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} |
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return bytes; |
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} |
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module.exports = function(name, version, hashfunc) { |
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var generateUUID = function(value, namespace, buf, offset) { |
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var off = buf && offset || 0; |
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if (typeof(value) == 'string') value = stringToBytes(value); |
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if (typeof(namespace) == 'string') namespace = uuidToBytes(namespace); |
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if (!Array.isArray(value)) throw TypeError('value must be an array of bytes'); |
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if (!Array.isArray(namespace) || namespace.length !== 16) throw TypeError('namespace must be uuid string or an Array of 16 byte values'); |
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// Per 4.3 |
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var bytes = hashfunc(namespace.concat(value)); |
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bytes[6] = (bytes[6] & 0x0f) | version; |
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bytes[8] = (bytes[8] & 0x3f) | 0x80; |
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if (buf) { |
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for (var idx = 0; idx < 16; ++idx) { |
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buf[off+idx] = bytes[idx]; |
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} |
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} |
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return buf || bytesToUuid(bytes); |
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}; |
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// Function#name is not settable on some platforms (#270) |
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try { |
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generateUUID.name = name; |
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} catch (err) { |
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} |
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// Pre-defined namespaces, per Appendix C |
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generateUUID.DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; |
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generateUUID.URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8'; |
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return generateUUID; |
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};
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