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util/uuid.lua @ 7056:7b0651e4534f
net.dns: Allow a zone id in resolv.conf (eg like %eth0)
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 04 Jan 2016 15:46:06 +0100 |
parent | 7010:001b3cff4ed8 |
child | 7012:990b4ddaf582 |
child | 7057:c633e1338554 |
rev | line source |
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1523
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Remove version number from copyright headers
Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM |
2923
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Update copyright headers for 2010
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
758 | 5 -- This project is MIT/X11 licensed. Please see the |
6 -- COPYING file in the source package for more information. | |
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7 -- |
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8 |
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9 |
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5ae018c016ba
util.uuid: Return a string, not a number. Looked so innocent.
Matthew Wild <mwild1@gmail.com>
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10 local tostring = tostring; |
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util.uuid: More uniqueness!
Waqas Hussain <waqas20@gmail.com>
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11 local os_time = os.time; |
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12 local os_clock = os.clock; |
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13 local sha1 = require "util.hashes".sha1; |
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14 |
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15 module "uuid" |
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16 |
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17 local last_uniq_time = 0; |
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18 local function uniq_time() |
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19 local new_uniq_time = os_time(); |
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parents:
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20 if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end |
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parents:
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21 last_uniq_time = new_uniq_time; |
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parents:
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22 return new_uniq_time; |
44
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23 end |
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24 |
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25 local function new_random(x) |
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26 return sha1(x..os_clock()..tostring({}), true); |
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parents:
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27 end |
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parents:
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28 |
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29 local buffer = new_random(uniq_time()); |
1304
0a49759464e0
util.uuid: Added function seed(string) to allow further seeding of the PRNG
Waqas Hussain <waqas20@gmail.com>
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30 local function _seed(x) |
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31 buffer = new_random(buffer..x); |
0a49759464e0
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Waqas Hussain <waqas20@gmail.com>
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32 end |
1303
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33 local function get_nibbles(n) |
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util.uuid: Use a local instead of a global.
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34 if #buffer < n then _seed(uniq_time()); end |
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35 local r = buffer:sub(0, n); |
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36 buffer = buffer:sub(n+1); |
2170e2c0d57a
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Waqas Hussain <waqas20@gmail.com>
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37 return r; |
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38 end |
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39 local function get_twobits() |
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40 return ("%x"):format(get_nibbles(1):byte() % 4 + 8); |
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parents:
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41 end |
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util.uuid: Now generates RFC 4122 complaint UUIDs (version 4 - random)
Waqas Hussain <waqas20@gmail.com>
parents:
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42 |
1302
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Waqas Hussain <waqas20@gmail.com>
parents:
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43 function generate() |
1303
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44 -- generate RFC 4122 complaint UUIDs (version 4 - random) |
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45 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12); |
1302
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Waqas Hussain <waqas20@gmail.com>
parents:
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46 end |
1304
0a49759464e0
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parents:
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47 seed = _seed; |
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parents:
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48 |
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49 return _M; |