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587 lines
17 KiB
587 lines
17 KiB
/*
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* Copyright (C) 2008 Sourcefire, Inc.
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*
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* Authors: aCaB <acab@clamav.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/* a naive pool allocator */
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#ifdef USE_MPOOL
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#if defined(HAVE_MMAP) && defined(HAVE_SYS_MMAN_H)
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#include <sys/mman.h>
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#endif
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#include <stddef.h>
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#include "others.h"
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#include "str.h"
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#include "readdb.h"
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#ifdef CL_DEBUG
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#include <assert.h>
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#define MPOOLMAGIC 0x5adeada5
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#define ALLOCPOISON 0x5a
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#define FREEPOISON 0xde
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#endif
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/* #define DEBUGMPOOL */
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/* #define EXIT_ON_FLUSH */
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#ifdef DEBUGMPOOL
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#define spam(...) cli_warnmsg( __VA_ARGS__)
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#else
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static inline void spam(const char *fmt, ...) { fmt = fmt; } /* gcc STFU */
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#endif
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#include "mpool.h"
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#define MIN_FRAGSIZE 262144
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#if SIZEOF_VOID_P==8
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static const unsigned int fragsz[] = {
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/* SIZE PERM TEMP ACT! */
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16, /* 7631 7189 USE/POW2 */
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24, /* 81785 114 USE */
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32, /* 1099428 78 USE/POW2 */
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40, /* 22466 69 USE */
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48, /* 7438 37 USE */
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56, /* 5567 32 USE */
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64, /* 2801 31 USE/POW2 */
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72, /* 610137 29 USE */
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80, /* 3579 28 USE */
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88, /* 2603 28 USE */
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96, /* 3535 27 USE */
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104, /* 3669 24 USE */
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112, /* 3897 23 USE */
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120, /* 5105 22 USE */
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128, /* 3097 22 USE/POW2 */
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136, /* 3977 21 USE */
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144, /* 32225 21 USE */
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152, /* 12384 20 USE */
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160, /* 17258 20 USE */
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176, /* 504 20 USE */
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192, /* 324 20 USE */
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216, /* 363 20 USE */
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240, /* 478 19 USE */
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256, /* 516 19 USE/POW2 */
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288, /* 249 19 USE */
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312, /* 741 18 USE */
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336, /* 47 18 USE */
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512, /* 1 18 POW2 */
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1024, /* 0 17 POW2 */
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2048, /* 0 16 POW2 */
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2056, /* 11408 16 USE */
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4096, /* 0 16 POW2 */
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8192, /* 0 14 POW2 */
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8736, /* 1 12 USE */
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10240, /* 1 11 USE */
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16384, /* 0 8 POW2 */
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20536, /* 1 7 USE */
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33704, /* 1 6 USE */
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37312, /* 1 5 USE */
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43800, /* 1 3 USE */
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63504, /* 9 3 USE */
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65536, /* 0 3 POW2 */
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89800, /* 1 2 USE */
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102624, /* 1 1 USE */
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131072, /* 0 1 POW2 */
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147296, /* 1 1 USE */
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262144, /* 0 1 POW2 */
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369280, /* 1 0 USE */
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507976, /* 9 0 USE */
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525976, /* 1 0 USE */
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1048576, /* 0 0 USE/POW2 */
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2097152,
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4194304,
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8388608,
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/* MAX_ALLOCATION is 184549376 but that's really not need here */
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};
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#else
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static const unsigned int fragsz[] = {
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/* SIZE PERM TEMP ACT! */
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8, /* 1992 7188 USE/POW2 */
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16, /* 49976 172 USE/POW2 */
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24, /* 995096 121 USE */
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32, /* 151077 68 USE/POW2 */
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40, /* 15175 58 USE */
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48, /* 7231 55 USE */
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56, /* 613432 47 USE */
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64, /* 1925 44 USE/POW2 */
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72, /* 3192 42 USE */
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80, /* 2782 40 USE */
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88, /* 3524 40 USE */
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96, /* 3395 40 USE */
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104, /* 3593 40 USE */
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112, /* 31850 40 USE */
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120, /* 5260 38 USE */
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128, /* 3231 38 USE/POW2 */
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136, /* 4785 38 USE */
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144, /* 3000 38 USE */
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152, /* 13384 38 USE */
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160, /* 14915 36 USE */
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168, /* 485 36 USE */
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176, /* 379 36 USE */
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184, /* 322 36 USE */
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192, /* 260 36 USE */
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200, /* 410 36 USE */
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208, /* 388 36 USE */
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216, /* 262 36 USE */
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224, /* 256 36 USE */
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232, /* 475 36 USE */
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248, /* 544 36 USE */
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256, /* 206 36 POW2 */
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264, /* 352 36 USE */
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280, /* 258 36 USE */
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296, /* 283 36 USE */
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304, /* 308 36 USE */
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312, /* 566 36 USE */
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328, /* 53 36 USE */
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376, /* 18 36 USE */
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616, /* 7 34 USE */
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1032, /* 11408 32 USE */
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2048, /* 0 32 POW2 */
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4096, /* 0 28 POW2 */
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5456, /* 1 20 USE */
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8192, /* 0 16 POW2 */
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10272, /* 1 14 USE */
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18656, /* 1 11 USE */
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21904, /* 1 6 USE */
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32768, /* 0 6 POW2 */
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44864, /* 1 4 USE */
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51240, /* 1 2 USE */
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65536, /* 0 2 POW2 */
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131072, /* 0 2 POW2 */
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147288, /* 1 2 USE */
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184624, /* 1 0 USE */
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253992, /* 9 0 USE */
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262144, /* 0 0 POW2 */
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525752, /* 1 0 USE */
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1048576, /* 0 0 USE/POW2 */
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2097152,
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4194304,
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8388608,
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};
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#endif
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#define FRAGSBITS (sizeof(fragsz)/sizeof(fragsz[0]))
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struct MPMAP {
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struct MPMAP *next;
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unsigned int size;
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unsigned int usize;
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};
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struct MP {
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unsigned int psize;
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struct FRAG *avail[FRAGSBITS];
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struct MPMAP mpm;
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};
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struct FRAG {
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#ifdef CL_DEBUG
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unsigned int magic;
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#endif
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union {
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struct FRAG *next;
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unsigned int sbits;
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int64_t dummy_align;
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/* needed to align to 64-bit on sparc, since pointers are 32-bit only,
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* yet we need 64-bit alignment for struct containing int64 members */
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} u;
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void *fake;
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};
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#define FRAG_OVERHEAD (offsetof(struct FRAG, fake))
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#define align_to_voidptr(size) (((size) / MAX(sizeof(void *), 8) + ((size) % MAX(sizeof(void *), 8) != 0)) * MAX(sizeof(void *), 8))
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#define mpool_roundup(size) (FRAG_OVERHEAD + align_to_voidptr(size))
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static unsigned int align_to_pagesize(struct MP *mp, unsigned int size) {
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return (size / mp->psize + (size % mp->psize != 0)) * mp->psize;
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}
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static unsigned int to_bits(unsigned int size) {
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unsigned int i;
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for(i=0; i<FRAGSBITS; i++)
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if(fragsz[i] >= size) return i;
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return FRAGSBITS;
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}
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static unsigned int from_bits(unsigned int bits) {
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if (bits >= FRAGSBITS) return 0;
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return fragsz[bits];
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}
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struct MP *mpool_create() {
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struct MP mp, *mpool_p;
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unsigned int sz;
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memset(&mp, 0, sizeof(mp));
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mp.psize = cli_getpagesize();
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sz = align_to_pagesize(&mp, MIN_FRAGSIZE);
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mp.mpm.usize = align_to_voidptr(sizeof(struct MPMAP));
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mp.mpm.size = sz - align_to_voidptr(sizeof(mp));
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if ((mpool_p = (struct MP *)mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE|ANONYMOUS_MAP, -1, 0)) == MAP_FAILED)
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return NULL;
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#ifdef CL_DEBUG
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memset(mpool_p, ALLOCPOISON, sz);
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#endif
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memcpy(mpool_p, &mp, sizeof(mp));
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spam("Map created @%p->%p - size %u out of %u - voidptr=%u\n", mpool_p, (char *)mpool_p + mp.mpm.size, mp.mpm.usize, mp.mpm.size, SIZEOF_VOID_P);
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return mpool_p;
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}
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void mpool_destroy(struct MP *mp) {
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struct MPMAP *mpm_next = mp->mpm.next, *mpm;
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unsigned int mpmsize;
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while((mpm = mpm_next)) {
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mpmsize = mpm->size;
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mpm_next = mpm->next;
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#ifdef CL_DEBUG
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memset(mpm, FREEPOISON, mpmsize);
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#endif
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munmap((void *)mpm, mpmsize);
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}
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mpmsize = mp->mpm.size;
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#ifdef CL_DEBUG
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memset(mp, FREEPOISON, mpmsize + align_to_voidptr(sizeof(*mp)));
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#endif
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munmap((void *)mp, mpmsize + align_to_voidptr(sizeof(*mp)));
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spam("Map destroyed @%p\n", mp);
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}
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void mpool_flush(struct MP *mp) {
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size_t used = 0, mused;
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struct MPMAP *mpm_next = mp->mpm.next, *mpm;
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#ifdef EXIT_ON_FLUSH
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exit(0);
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#endif
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while((mpm = mpm_next)) {
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mpm_next = mpm->next;
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mused = align_to_pagesize(mp, mpm->usize);
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if(mused < mpm->size) {
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#ifdef CL_DEBUG
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memset((char *)mpm + mused, FREEPOISON, mpm->size - mused);
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#endif
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munmap((char *)mpm + mused, mpm->size - mused);
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mpm->size = mused;
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}
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used += mpm->size;
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}
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mused = align_to_pagesize(mp, mp->mpm.usize + align_to_voidptr(sizeof(*mp)));
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if (mused < mp->mpm.size + align_to_voidptr(sizeof(*mp))) {
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#ifdef CL_DEBUG
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memset((char *)mp + mused, FREEPOISON, mp->mpm.size + align_to_voidptr(sizeof(*mp)) - mused);
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#endif
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munmap((char *)mp + mused, mp->mpm.size + align_to_voidptr(sizeof(*mp)) - mused);
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mp->mpm.size = mused - align_to_voidptr(sizeof(*mp));
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}
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used += mp->mpm.size;
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spam("Map flushed @%p, in use: %lu\n", mp, used);
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}
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int mpool_getstats(const struct cl_engine *eng, size_t *used, size_t *total)
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{
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size_t sum_used = 0, sum_total = 0;
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const struct MPMAP *mpm;
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const mpool_t *mp;
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/* checking refcount is not necessary, but safer */
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if (!eng || !eng->refcount)
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return -1;
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mp = eng->mempool;
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if (!mp)
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return -1;
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for(mpm = &mp->mpm; mpm; mpm = mpm->next) {
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sum_used += mpm->usize;
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sum_total += mpm->size;
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}
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*used = sum_used;
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*total = sum_total;
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return 0;
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}
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void *mpool_malloc(struct MP *mp, size_t size) {
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unsigned int i, needed = align_to_voidptr(size + FRAG_OVERHEAD);
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const unsigned int sbits = to_bits(needed);
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struct FRAG *f = NULL;
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struct MPMAP *mpm = &mp->mpm;
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/* check_all(mp); */
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if (!size || sbits == FRAGSBITS) {
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cli_errmsg("mpool_malloc(): Attempt to allocate %lu bytes. Please report to http://bugs.clamav.net\n", (unsigned long int) size);
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return NULL;
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}
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/* Case 1: We have a free'd frag */
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if((f = mp->avail[sbits])) {
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spam("malloc @%p size %u (freed)\n", f, align_to_voidptr(size + FRAG_OVERHEAD));
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mp->avail[sbits] = f->u.next;
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f->u.sbits = sbits;
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#ifdef CL_DEBUG
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f->magic = MPOOLMAGIC;
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memset(&f->fake, ALLOCPOISON, size);
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#endif
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return &f->fake;
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}
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if (!(needed = from_bits(sbits))) {
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cli_errmsg("mpool_malloc(): Attempt to allocate %lu bytes. Please report to http://bugs.clamav.net\n", (unsigned long int) size);
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return NULL;
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}
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/* Case 2: We have nuff room available for this frag already */
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while(mpm) {
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if(mpm->size - mpm->usize >= needed) {
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f = (struct FRAG *)((char *)mpm + mpm->usize);
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spam("malloc @%p size %u (hole)\n", f, align_to_voidptr(size + FRAG_OVERHEAD));
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mpm->usize += needed;
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f->u.sbits = sbits;
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#ifdef CL_DEBUG
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f->magic = MPOOLMAGIC;
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memset(&f->fake, ALLOCPOISON, size);
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#endif
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return &f->fake;
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}
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mpm = mpm->next;
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}
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/* Case 3: We allocate more */
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if (needed + align_to_voidptr(sizeof(*mpm)) > MIN_FRAGSIZE)
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i = align_to_pagesize(mp, needed + align_to_voidptr(sizeof(*mpm)));
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else
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i = align_to_pagesize(mp, MIN_FRAGSIZE);
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if ((mpm = (struct MPMAP *)mmap(NULL, i, PROT_READ | PROT_WRITE, MAP_PRIVATE|ANONYMOUS_MAP, -1, 0)) == MAP_FAILED) {
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cli_errmsg("mpool_malloc(): Can't allocate memory (%lu bytes).\n", (unsigned long int)i);
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spam("failed to alloc %u bytes (%u requested)\n", i, size);
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return NULL;
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}
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#ifdef CL_DEBUG
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memset(mpm, ALLOCPOISON, i);
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#endif
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mpm->size = i;
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mpm->usize = needed + align_to_voidptr(sizeof(*mpm));
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mpm->next = mp->mpm.next;
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mp->mpm.next = mpm;
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f = (struct FRAG *)((char *)mpm + align_to_voidptr(sizeof(*mpm)));
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spam("malloc @%p size %u (new map)\n", f, align_to_voidptr(size + FRAG_OVERHEAD));
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f->u.sbits = sbits;
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#ifdef CL_DEBUG
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f->magic = MPOOLMAGIC;
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#endif
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return &f->fake;
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}
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void mpool_free(struct MP *mp, void *ptr) {
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struct FRAG *f = (struct FRAG *)((char *)ptr - FRAG_OVERHEAD);
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unsigned int sbits;
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if (!ptr) return;
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#ifdef CL_DEBUG
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assert(f->magic == MPOOLMAGIC && "Attempt to mpool_free a pointer we did not allocate!");
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memset(ptr, FREEPOISON, from_bits(f->u.sbits) - FRAG_OVERHEAD);
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#endif
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sbits = f->u.sbits;
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f->u.next = mp->avail[sbits];
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mp->avail[sbits] = f;
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spam("free @%p\n", f);
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}
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void *mpool_calloc(struct MP *mp, size_t nmemb, size_t size) {
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unsigned int needed = nmemb*size;
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void *ptr;
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if(!needed) return NULL;
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if((ptr = mpool_malloc(mp, needed)))
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memset(ptr, 0, needed);
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return ptr;
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}
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void *mpool_realloc(struct MP *mp, void *ptr, size_t size) {
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struct FRAG *f = (struct FRAG *)((char *)ptr - FRAG_OVERHEAD);
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unsigned int csize;
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void *new_ptr;
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if (!ptr) return mpool_malloc(mp, size);
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if(!size || !(csize = from_bits(f->u.sbits))) {
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cli_errmsg("mpool_realloc(): Attempt to allocate %lu bytes. Please report to http://bugs.clamav.net\n", (unsigned long int) size);
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return NULL;
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}
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csize -= FRAG_OVERHEAD;
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if (csize >= size && (!f->u.sbits || from_bits(f->u.sbits-1)-FRAG_OVERHEAD < size)) {
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spam("free @%p\n", f);
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spam("malloc @%p size %u (self)\n", f, align_to_voidptr(size + FRAG_OVERHEAD));
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return ptr;
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}
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if (!(new_ptr = mpool_malloc(mp, size)))
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return NULL;
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memcpy(new_ptr, ptr, csize <= size ? csize : size);
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mpool_free(mp, ptr);
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return new_ptr;
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}
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void *mpool_realloc2(struct MP *mp, void *ptr, size_t size) {
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void *new_ptr = mpool_realloc(mp, ptr, size);
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if(new_ptr)
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return new_ptr;
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mpool_free(mp, ptr);
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return NULL;
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}
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unsigned char *cli_mpool_hex2str(mpool_t *mp, const char *hex) {
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unsigned char *str;
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size_t len = strlen((const char*)hex);
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if (len&1) {
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cli_errmsg("cli_hex2str(): Malformed hexstring: %s (length: %u)\n", hex, (unsigned)len);
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return NULL;
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}
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str = mpool_malloc(mp, (len/2) + 1);
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if (cli_hex2str_to(hex, str, len) == -1) {
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mpool_free(mp, str);
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return NULL;
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}
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str[len/2] = '\0';
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return str;
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}
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char *cli_mpool_strdup(mpool_t *mp, const char *s) {
|
|
char *alloc;
|
|
unsigned int strsz;
|
|
|
|
if(s == NULL) {
|
|
cli_errmsg("cli_mpool_strdup(): s == NULL. Please report to http://bugs.clamav.net\n");
|
|
return NULL;
|
|
}
|
|
|
|
strsz = strlen(s) + 1;
|
|
alloc = mpool_malloc(mp, strsz);
|
|
if(!alloc)
|
|
cli_errmsg("cli_mpool_strdup(): Can't allocate memory (%u bytes).\n", (unsigned int) strsz);
|
|
else
|
|
memcpy(alloc, s, strsz);
|
|
return alloc;
|
|
}
|
|
|
|
char *cli_mpool_virname(mpool_t *mp, const char *virname, unsigned int official) {
|
|
char *newname, *pt;
|
|
if(!virname)
|
|
return NULL;
|
|
|
|
if((pt = strchr(virname, ' ')))
|
|
if((pt = strstr(pt, " (Clam)")))
|
|
*pt='\0';
|
|
|
|
if(!virname[0]) {
|
|
cli_errmsg("cli_virname: Empty virus name\n");
|
|
return NULL;
|
|
}
|
|
|
|
if(official)
|
|
return cli_mpool_strdup(mp, virname);
|
|
|
|
newname = (char *)mpool_malloc(mp, strlen(virname) + 11 + 1);
|
|
if(!newname) {
|
|
cli_errmsg("cli_virname: Can't allocate memory for newname\n");
|
|
return NULL;
|
|
}
|
|
sprintf(newname, "%s.UNOFFICIAL", virname);
|
|
return newname;
|
|
}
|
|
|
|
|
|
uint16_t *cli_mpool_hex2ui(mpool_t *mp, const char *hex) {
|
|
uint16_t *str;
|
|
unsigned int len;
|
|
|
|
len = strlen(hex);
|
|
|
|
if(len % 2 != 0) {
|
|
cli_errmsg("cli_mpool_hex2ui(): Malformed hexstring: %s (length: %u)\n", hex, len);
|
|
return NULL;
|
|
}
|
|
|
|
str = mpool_calloc(mp, (len / 2) + 1, sizeof(uint16_t));
|
|
if(!str)
|
|
return NULL;
|
|
|
|
if(cli_realhex2ui(hex, str, len))
|
|
return str;
|
|
|
|
mpool_free(mp, str);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
#ifdef DEBUGMPOOL
|
|
void mpool_stats(struct MP *mp) {
|
|
unsigned int i=0, ta=0, tu=0;
|
|
struct MPMAP *mpm = &mp->mpm;
|
|
|
|
cli_warnmsg("MEMORY POOL STATISTICS\n map \tsize\tused\t%\n");
|
|
while(mpm) {
|
|
cli_warnmsg("- %u\t%u\t%u\t%f%%\n", i, mpm->size, mpm->usize, (float)mpm->usize/(float)mpm->size*100);
|
|
ta+=mpm->size;
|
|
tu+=mpm->usize;
|
|
i++;
|
|
mpm = mpm->next;
|
|
}
|
|
cli_warnmsg("MEMORY POOL SUMMARY\nMaps: %u\nTotal: %u\nUsed: %u (%f%%)\n", i, ta, tu, (float)tu/(float)ta*100);
|
|
}
|
|
|
|
void check_all(struct MP *mp) {
|
|
struct MPMAP *mpm = &mp->mpm;
|
|
while(mpm) {
|
|
volatile unsigned char *c = (unsigned char *)mpm;
|
|
unsigned int len = mpm->size;
|
|
spam("checking object %p - size %u\n", mpm, len);
|
|
while (len--) {
|
|
c[len];
|
|
}
|
|
mpm=mpm->next;
|
|
}
|
|
}
|
|
#endif /* DEBUGMPOOL */
|
|
|
|
|
|
#else
|
|
/* dummy definitions to make Solaris linker happy.
|
|
* these symbols are declared in libclamav.map */
|
|
void mpool_free() {}
|
|
void mpool_create() {}
|
|
void mpool_destroy() {}
|
|
void mpool_getstats() {}
|
|
|
|
#endif /* USE_MPOOL */
|
|
|
|
|