#ifndef AVUTIL_MEM_H
#define AVUTIL_MEM_H
+#include <limits.h>
+#include <stdint.h>
+
#include "attributes.h"
#include "avutil.h"
-#if defined(__ICC) && _ICC < 1200 || defined(__SUNPRO_C)
+/**
+ * @addtogroup lavu_mem
+ * @{
+ */
+
+
+#if defined(__ICC) && __ICC < 1200 || defined(__SUNPRO_C)
#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
#elif defined(__TI_COMPILER_VERSION__)
#endif
#if AV_GCC_VERSION_AT_LEAST(4,3)
- #define av_alloc_size(n) __attribute__((alloc_size(n)))
+ #define av_alloc_size(...) __attribute__((alloc_size(__VA_ARGS__)))
#else
- #define av_alloc_size(n)
+ #define av_alloc_size(...)
#endif
/**
*/
void *av_malloc(size_t size) av_malloc_attrib av_alloc_size(1);
+/**
+ * Helper function to allocate a block of size * nmemb bytes with
+ * using av_malloc()
+ * @param nmemb Number of elements
+ * @param size Size of the single element
+ * @return Pointer to the allocated block, NULL if the block cannot
+ * be allocated.
+ * @see av_malloc()
+ */
+av_alloc_size(1, 2) static inline void *av_malloc_array(size_t nmemb, size_t size)
+{
+ if (size <= 0 || nmemb >= INT_MAX / size)
+ return NULL;
+ return av_malloc(nmemb * size);
+}
+
/**
* Allocate or reallocate a block of memory.
* If ptr is NULL and size > 0, allocate a new block. If
* size is zero, free the memory block pointed to by ptr.
- * @param size Size in bytes for the memory block to be allocated or
- * reallocated.
* @param ptr Pointer to a memory block already allocated with
* av_malloc(z)() or av_realloc() or NULL.
+ * @param size Size in bytes for the memory block to be allocated or
+ * reallocated.
* @return Pointer to a newly reallocated block or NULL if the block
* cannot be reallocated or the function is used to free the memory block.
* @see av_fast_realloc()
*/
void *av_mallocz(size_t size) av_malloc_attrib av_alloc_size(1);
+/**
+ * Helper function to allocate a block of size * nmemb bytes with
+ * using av_mallocz()
+ * @param nmemb Number of elements
+ * @param size Size of the single element
+ * @return Pointer to the allocated block, NULL if the block cannot
+ * be allocated.
+ * @see av_mallocz()
+ * @see av_malloc_array()
+ */
+av_alloc_size(1, 2) static inline void *av_mallocz_array(size_t nmemb, size_t size)
+{
+ if (size <= 0 || nmemb >= INT_MAX / size)
+ return NULL;
+ return av_mallocz(nmemb * size);
+}
+
/**
* Duplicate the string s.
* @param s string to be duplicated
*/
void av_freep(void *ptr);
+/**
+ * @brief deliberately overlapping memcpy implementation
+ * @param dst destination buffer
+ * @param back how many bytes back we start (the initial size of the overlapping window)
+ * @param cnt number of bytes to copy, must be >= 0
+ *
+ * cnt > back is valid, this will copy the bytes we just copied,
+ * thus creating a repeating pattern with a period length of back.
+ */
+void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
+
+/**
+ * @}
+ */
+
#endif /* AVUTIL_MEM_H */