Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pj/assert.h> |
| 21 | #include <pj/string.h> |
| 22 | |
| 23 | #if PJ_SAFE_POOL |
| 24 | # define SIG_SIZE sizeof(pj_uint32_t) |
| 25 | |
| 26 | static void apply_signature(void *p, pj_size_t size); |
| 27 | static void check_pool_signature(void *p, pj_size_t size); |
| 28 | |
| 29 | # define APPLY_SIG(p,sz) apply_signature(p,sz), \ |
| 30 | p=(void*)(((char*)p)+SIG_SIZE) |
| 31 | # define REMOVE_SIG(p,sz) check_pool_signature(p,sz), \ |
| 32 | p=(void*)(((char*)p)-SIG_SIZE) |
| 33 | |
| 34 | # define SIG_BEGIN 0x600DC0DE |
| 35 | # define SIG_END 0x0BADC0DE |
| 36 | |
| 37 | static void apply_signature(void *p, pj_size_t size) |
| 38 | { |
| 39 | pj_uint32_t sig; |
| 40 | |
| 41 | sig = SIG_BEGIN; |
| 42 | pj_memcpy(p, &sig, SIG_SIZE); |
| 43 | |
| 44 | sig = SIG_END; |
| 45 | pj_memcpy(((char*)p)+SIG_SIZE+size, &sig, SIG_SIZE); |
| 46 | } |
| 47 | |
| 48 | static void check_pool_signature(void *p, pj_size_t size) |
| 49 | { |
| 50 | pj_uint32_t sig; |
| 51 | pj_uint8_t *mem = (pj_uint8_t*)p; |
| 52 | |
| 53 | /* Check that signature at the start of the block is still intact */ |
| 54 | sig = SIG_BEGIN; |
| 55 | pj_assert(!pj_memcmp(mem-SIG_SIZE, &sig, SIG_SIZE)); |
| 56 | |
| 57 | /* Check that signature at the end of the block is still intact. |
| 58 | * Note that "mem" has been incremented by SIG_SIZE |
| 59 | */ |
| 60 | sig = SIG_END; |
| 61 | pj_assert(!pj_memcmp(mem+size, &sig, SIG_SIZE)); |
| 62 | } |
| 63 | |
| 64 | #else |
| 65 | # define SIG_SIZE 0 |
| 66 | # define APPLY_SIG(p,sz) |
| 67 | # define REMOVE_SIG(p,sz) |
| 68 | #endif |