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/* Copyright (c) the JPEG XL Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
/** @addtogroup libjxl_common
* @{
* @file memory_manager.h
* @brief Abstraction functions used by JPEG XL to allocate memory.
*/
#ifndef JXL_MEMORY_MANAGER_H_
#define JXL_MEMORY_MANAGER_H_
#include <stddef.h>
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
/**
* Allocating function for a memory region of a given size.
*
* Allocates a contiguous memory region of size @p size bytes. The returned
* memory may not be aligned to a specific size or initialized at all.
*
* @param opaque custom memory manager handle provided by the caller.
* @param size in bytes of the requested memory region.
* @return @c NULL if the memory can not be allocated,
* @return pointer to the memory otherwise.
*/
typedef void* (*jpegxl_alloc_func)(void* opaque, size_t size);
/**
* Deallocating function pointer type.
*
* This function @b MUST do nothing if @p address is @c NULL.
*
* @param opaque custom memory manager handle provided by the caller.
* @param address memory region pointer returned by ::jpegxl_alloc_func, or @c
* NULL.
*/
typedef void (*jpegxl_free_func)(void* opaque, void* address);
/**
* Memory Manager struct.
* These functions, when provided by the caller, will be used to handle memory
* allocations.
*/
typedef struct JxlMemoryManagerStruct {
/** The opaque pointer that will be passed as the first parameter to all the
* functions in this struct. */
void* opaque;
/** Memory allocation function. This can be NULL if and only if also the
* free() member in this class is NULL. All dynamic memory will be allocated
* and freed with these functions if they are not NULL. */
jpegxl_alloc_func alloc;
/** Free function matching the alloc() member. */
jpegxl_free_func free;
/* TODO(deymo): Add cache-aligned alloc/free functions here. */
} JxlMemoryManager;
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif /* JXL_MEMORY_MANAGER_H_ */
/** @}*/
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