Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
Benny Prijono | a771a51 | 2007-02-19 01:13:53 +0000 | [diff] [blame] | 3 | * Copyright (C)2003-2007 Benny Prijono <benny@prijono.org> |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #include <pj/guid.h> |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 20 | #include <pj/assert.h> |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 21 | #include <pj/rand.h> |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 22 | #include <pj/os.h> |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 23 | #include <pj/string.h> |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 24 | |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 25 | PJ_DEF_DATA(const unsigned) PJ_GUID_STRING_LENGTH=32; |
| 26 | |
| 27 | static char guid_chars[64]; |
Benny Prijono | 1f61a8f | 2007-08-16 10:11:44 +0000 | [diff] [blame] | 28 | |
| 29 | PJ_DEF(unsigned) pj_GUID_STRING_LENGTH() |
| 30 | { |
| 31 | return PJ_GUID_STRING_LENGTH; |
| 32 | } |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 33 | |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 34 | static void init_guid_chars(void) |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 35 | { |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 36 | char *p = guid_chars; |
| 37 | unsigned i; |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 38 | |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 39 | for (i=0; i<10; ++i) |
| 40 | *p++ = '0'+i; |
| 41 | |
| 42 | for (i=0; i<26; ++i) { |
| 43 | *p++ = 'a'+i; |
| 44 | *p++ = 'A'+i; |
| 45 | } |
| 46 | |
| 47 | *p++ = '-'; |
| 48 | *p++ = '.'; |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 49 | } |
| 50 | |
| 51 | PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str) |
| 52 | { |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 53 | char *p, *end; |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 54 | |
| 55 | PJ_CHECK_STACK(); |
| 56 | |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 57 | if (guid_chars[0] == '\0') { |
| 58 | pj_enter_critical_section(); |
| 59 | if (guid_chars[0] == '\0') { |
| 60 | init_guid_chars(); |
| 61 | } |
| 62 | pj_enter_critical_section(); |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 63 | } |
| 64 | |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 65 | /* This would only work if PJ_GUID_STRING_LENGTH is multiple of 2 bytes */ |
| 66 | pj_assert(PJ_GUID_STRING_LENGTH % 2 == 0); |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 67 | |
Benny Prijono | 8389c31 | 2008-02-21 21:36:34 +0000 | [diff] [blame^] | 68 | for (p=str->ptr, end=p+PJ_GUID_STRING_LENGTH; p<end; ) { |
| 69 | /* Assumes rand() only has 16bit randomness */ |
| 70 | unsigned short val = pj_rand(); |
| 71 | *p++ = guid_chars[(val >> 8) & 63]; |
| 72 | *p++ = guid_chars[(val & 0xFF) & 63]; |
| 73 | } |
| 74 | |
| 75 | str->slen = PJ_GUID_STRING_LENGTH; |
Benny Prijono | 9033e31 | 2005-11-21 02:08:39 +0000 | [diff] [blame] | 76 | return str; |
| 77 | } |
| 78 | |