aaac7fed
 liuqimichale
add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
var bytesToUuid = require('./bytesToUuid');
function uuidToBytes(uuid) {
// Note: We assume we're being passed a valid uuid string
var bytes = [];
uuid.replace(/[a-fA-F0-9]{2}/g, function(hex) {
bytes.push(parseInt(hex, 16));
});
return bytes;
}
function stringToBytes(str) {
str = unescape(encodeURIComponent(str)); // UTF8 escape
var bytes = new Array(str.length);
for (var i = 0; i < str.length; i++) {
bytes[i] = str.charCodeAt(i);
}
return bytes;
}
module.exports = function(name, version, hashfunc) {
var generateUUID = function(value, namespace, buf, offset) {
var off = buf && offset || 0;
if (typeof(value) == 'string') value = stringToBytes(value);
if (typeof(namespace) == 'string') namespace = uuidToBytes(namespace);
if (!Array.isArray(value)) throw TypeError('value must be an array of bytes');
if (!Array.isArray(namespace) || namespace.length !== 16) throw TypeError('namespace must be uuid string or an Array of 16 byte values');
// Per 4.3
var bytes = hashfunc(namespace.concat(value));
bytes[6] = (bytes[6] & 0x0f) | version;
bytes[8] = (bytes[8] & 0x3f) | 0x80;
if (buf) {
for (var idx = 0; idx < 16; ++idx) {
buf[off+idx] = bytes[idx];
}
}
return buf || bytesToUuid(bytes);
};
// Function#name is not settable on some platforms (#270)
try {
generateUUID.name = name;
} catch (err) {
}
// Pre-defined namespaces, per Appendix C
generateUUID.DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
generateUUID.URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8';
return generateUUID;
};
|
