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/* $Id: guid_simple.c 3553 2011-05-05 06:14:19Z nanang $ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pj/guid.h>
#include <pj/assert.h>
#include <pj/rand.h>
#include <pj/os.h>
#include <pj/string.h>
PJ_DEF_DATA(const unsigned) PJ_GUID_STRING_LENGTH=32;
static char guid_chars[64];
PJ_DEF(unsigned) pj_GUID_STRING_LENGTH()
{
return PJ_GUID_STRING_LENGTH;
}
static void init_guid_chars(void)
{
char *p = guid_chars;
unsigned i;
for (i=0; i<10; ++i)
*p++ = '0'+i;
for (i=0; i<26; ++i) {
*p++ = 'a'+i;
*p++ = 'A'+i;
}
*p++ = '-';
*p++ = '.';
}
PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str)
{
char *p, *end;
PJ_CHECK_STACK();
if (guid_chars[0] == '\0') {
pj_enter_critical_section();
if (guid_chars[0] == '\0') {
init_guid_chars();
}
pj_leave_critical_section();
}
/* This would only work if PJ_GUID_STRING_LENGTH is multiple of 2 bytes */
pj_assert(PJ_GUID_STRING_LENGTH % 2 == 0);
for (p=str->ptr, end=p+PJ_GUID_STRING_LENGTH; p<end; ) {
pj_uint32_t rand_val = pj_rand();
pj_uint32_t rand_idx = RAND_MAX;
for ( ; rand_idx>0 && p<end; rand_idx>>=8, rand_val>>=8, p++) {
*p = guid_chars[(rand_val & 0xFF) & 63];
}
}
str->slen = PJ_GUID_STRING_LENGTH;
return str;
}
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