diff options
Diffstat (limited to 'libavutil/mem.c')
| -rw-r--r-- | libavutil/mem.c | 100 |
1 files changed, 83 insertions, 17 deletions
diff --git a/libavutil/mem.c b/libavutil/mem.c index 3769da7d21..8ec226b17a 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> @@ -57,9 +59,18 @@ 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) { @@ -69,23 +80,24 @@ 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 - 1)&(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); + ptr = memalign(ALIGN,size); /* Why 64? Indeed, we should align it: on 4 for 386 @@ -113,6 +125,14 @@ 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, 0x2a, size); +#endif return ptr; } @@ -123,21 +143,38 @@ 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 //FIXME this isn't aligned correctly, though it probably isn't needed if(!ptr) return av_malloc(size); diff= ((char*)ptr)[-1]; - return (char*)realloc((char*)ptr - diff, size + diff) + diff; + 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_free(void *ptr) { #if CONFIG_MEMALIGN_HACK @@ -165,6 +202,13 @@ 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; @@ -176,3 +220,25 @@ char *av_strdup(const char *s) } return ptr; } + +/* add one element to a dynamic array */ +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 + nb_alloc = nb * 2; + tab = av_realloc(tab, nb_alloc * sizeof(intptr_t)); + *(intptr_t**)tab_ptr = tab; + } + tab[nb++] = (intptr_t)elem; + *nb_ptr = nb; +} + |