diff options
Diffstat (limited to 'libavutil/mem.c')
| -rw-r--r-- | libavutil/mem.c | 181 |
1 files changed, 150 insertions, 31 deletions
diff --git a/libavutil/mem.c b/libavutil/mem.c index e901533cc7..76f6b65d1a 100644 --- a/libavutil/mem.c +++ b/libavutil/mem.c @@ -2,20 +2,20 @@ * default memory allocator for libavutil * Copyright (c) 2002 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -24,6 +24,8 @@ * default memory allocator for libavutil */ +#define _XOPEN_SOURCE 600 + #include "config.h" #include <limits.h> @@ -34,6 +36,7 @@ #include <malloc.h> #endif +#include "avassert.h" #include "avutil.h" #include "intreadwrite.h" #include "mem.h" @@ -54,9 +57,18 @@ void free(void *ptr); #endif /* MALLOC_PREFIX */ -/* You can redefine av_malloc and av_free in your project to use your - * memory allocator. You do not need to suppress this file because the - * linker will do it automatically. */ +#define ALIGN (HAVE_AVX ? 32 : 16) + +/* NOTE: if you want to override these functions with your own + * implementations (not recommended) you have to link libav* as + * dynamic libraries and remove -Wl,-Bsymbolic from the linker flags. + * Note that this will cost performance. */ + +static size_t max_alloc_size= INT_MAX; + +void av_max_alloc(size_t max){ + max_alloc_size = max; +} void *av_malloc(size_t size) { @@ -66,23 +78,28 @@ void *av_malloc(size_t size) #endif /* let's disallow possible ambiguous cases */ - if (size > (INT_MAX - 32) || !size) + if (size > (max_alloc_size - 32)) return NULL; #if CONFIG_MEMALIGN_HACK - ptr = malloc(size + 32); + ptr = malloc(size + ALIGN); if (!ptr) return ptr; - diff = ((-(long)ptr - 1) & 31) + 1; + diff = ((~(long)ptr)&(ALIGN - 1)) + 1; ptr = (char *)ptr + diff; ((char *)ptr)[-1] = diff; #elif HAVE_POSIX_MEMALIGN - if (posix_memalign(&ptr, 32, size)) + if (size) //OS X on SDK 10.6 has a broken posix_memalign implementation + if (posix_memalign(&ptr, ALIGN, size)) ptr = NULL; #elif HAVE_ALIGNED_MALLOC - ptr = _aligned_malloc(size, 32); + ptr = _aligned_malloc(size, ALIGN); #elif HAVE_MEMALIGN - ptr = memalign(32, size); +#ifndef __DJGPP__ + ptr = memalign(ALIGN, size); +#else + ptr = memalign(size, ALIGN); +#endif /* Why 64? * Indeed, we should align it: * on 4 for 386 @@ -110,6 +127,14 @@ void *av_malloc(size_t size) #else ptr = malloc(size); #endif + if(!ptr && !size) { + size = 1; + ptr= av_malloc(1); + } +#if CONFIG_MEMORY_POISONING + if (ptr) + memset(ptr, FF_MEMORY_POISON, size); +#endif return ptr; } @@ -120,7 +145,7 @@ void *av_realloc(void *ptr, size_t size) #endif /* let's disallow possible ambiguous cases */ - if (size > (INT_MAX - 16)) + if (size > (max_alloc_size - 32)) return NULL; #if CONFIG_MEMALIGN_HACK @@ -128,14 +153,33 @@ void *av_realloc(void *ptr, size_t size) if (!ptr) return av_malloc(size); diff = ((char *)ptr)[-1]; - return (char *)realloc((char *)ptr - diff, size + diff) + diff; + av_assert0(diff>0 && diff<=ALIGN); + ptr = realloc((char *)ptr - diff, size + diff); + if (ptr) + ptr = (char *)ptr + diff; + return ptr; #elif HAVE_ALIGNED_MALLOC - return _aligned_realloc(ptr, size, 32); + return _aligned_realloc(ptr, size + !size, ALIGN); #else - return realloc(ptr, size); + return realloc(ptr, size + !size); #endif } +void *av_realloc_f(void *ptr, size_t nelem, size_t elsize) +{ + size_t size; + void *r; + + if (av_size_mult(elsize, nelem, &size)) { + av_free(ptr); + return NULL; + } + r = av_realloc(ptr, size); + if (!r && size) + av_free(ptr); + return r; +} + void *av_realloc_array(void *ptr, size_t nmemb, size_t size) { if (size <= 0 || nmemb >= INT_MAX / size) @@ -146,27 +190,20 @@ void *av_realloc_array(void *ptr, size_t nmemb, size_t size) int av_reallocp_array(void *ptr, size_t nmemb, size_t size) { void **ptrptr = ptr; - void *ret; - if (size <= 0 || nmemb >= INT_MAX / size) - return AVERROR(ENOMEM); - if (nmemb <= 0) { - av_freep(ptr); - return 0; - } - ret = av_realloc(*ptrptr, nmemb * size); - if (!ret) { - av_freep(ptr); + *ptrptr = av_realloc_f(*ptrptr, nmemb, size); + if (!*ptrptr && !(nmemb && size)) return AVERROR(ENOMEM); - } - *ptrptr = ret; return 0; } void av_free(void *ptr) { #if CONFIG_MEMALIGN_HACK - if (ptr) - free((char *)ptr - ((char *)ptr)[-1]); + if (ptr) { + int v= ((char *)ptr)[-1]; + av_assert0(v>0 && v<=ALIGN); + free((char *)ptr - v); + } #elif HAVE_ALIGNED_MALLOC _aligned_free(ptr); #else @@ -189,6 +226,13 @@ void *av_mallocz(size_t size) return ptr; } +void *av_calloc(size_t nmemb, size_t size) +{ + if (size <= 0 || nmemb >= INT_MAX / size) + return NULL; + return av_mallocz(nmemb * size); +} + char *av_strdup(const char *s) { char *ptr = NULL; @@ -201,6 +245,80 @@ char *av_strdup(const char *s) return ptr; } +void *av_memdup(const void *p, size_t size) +{ + void *ptr = NULL; + if (p) { + ptr = av_malloc(size); + if (ptr) + memcpy(ptr, p, size); + } + return ptr; +} + +void av_dynarray_add(void *tab_ptr, int *nb_ptr, void *elem) +{ + /* see similar ffmpeg.c:grow_array() */ + int nb, nb_alloc; + intptr_t *tab; + + nb = *nb_ptr; + tab = *(intptr_t**)tab_ptr; + if ((nb & (nb - 1)) == 0) { + if (nb == 0) { + nb_alloc = 1; + } else { + if (nb > INT_MAX / (2 * sizeof(intptr_t))) + goto fail; + nb_alloc = nb * 2; + } + tab = av_realloc(tab, nb_alloc * sizeof(intptr_t)); + if (!tab) + goto fail; + *(intptr_t**)tab_ptr = tab; + } + tab[nb++] = (intptr_t)elem; + *nb_ptr = nb; + return; + +fail: + av_freep(tab_ptr); + *nb_ptr = 0; +} + +void *av_dynarray2_add(void **tab_ptr, int *nb_ptr, size_t elem_size, + const uint8_t *elem_data) +{ + int nb = *nb_ptr, nb_alloc; + uint8_t *tab = *tab_ptr, *tab_elem_data; + + if ((nb & (nb - 1)) == 0) { + if (nb == 0) { + nb_alloc = 1; + } else { + if (nb > INT_MAX / (2 * elem_size)) + goto fail; + nb_alloc = nb * 2; + } + tab = av_realloc(tab, nb_alloc * elem_size); + if (!tab) + goto fail; + *tab_ptr = tab; + } + *nb_ptr = nb + 1; + tab_elem_data = tab + nb*elem_size; + if (elem_data) + memcpy(tab_elem_data, elem_data, elem_size); + else if (CONFIG_MEMORY_POISONING) + memset(tab_elem_data, FF_MEMORY_POISON, elem_size); + return tab_elem_data; + +fail: + av_freep(tab_ptr); + *nb_ptr = 0; + return NULL; +} + static void fill16(uint8_t *dst, int len) { uint32_t v = AV_RN16(dst - 2); @@ -324,3 +442,4 @@ void av_memcpy_backptr(uint8_t *dst, int back, int cnt) *dst = *src; } } + |