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/* Copyright 2016 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/* Macros for memory management. */
#ifndef BROTLI_ENC_MEMORY_H_
#define BROTLI_ENC_MEMORY_H_
#include <string.h> /* memcpy */
#include "../common/platform.h"
#include <brotli/types.h>
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#if !defined(BROTLI_ENCODER_CLEANUP_ON_OOM) && \
!defined(BROTLI_ENCODER_EXIT_ON_OOM)
#define BROTLI_ENCODER_EXIT_ON_OOM
#endif
typedef struct MemoryManager {
brotli_alloc_func alloc_func;
brotli_free_func free_func;
void* opaque;
#if !defined(BROTLI_ENCODER_EXIT_ON_OOM)
BROTLI_BOOL is_oom;
size_t perm_allocated;
size_t new_allocated;
size_t new_freed;
void* pointers[256];
#endif /* BROTLI_ENCODER_EXIT_ON_OOM */
} MemoryManager;
BROTLI_INTERNAL void BrotliInitMemoryManager(
MemoryManager* m, brotli_alloc_func alloc_func, brotli_free_func free_func,
void* opaque);
BROTLI_INTERNAL void* BrotliAllocate(MemoryManager* m, size_t n);
#define BROTLI_ALLOC(M, T, N) \
((N) > 0 ? ((T*)BrotliAllocate((M), (N) * sizeof(T))) : NULL)
BROTLI_INTERNAL void BrotliFree(MemoryManager* m, void* p);
#define BROTLI_FREE(M, P) { \
BrotliFree((M), (P)); \
P = NULL; \
}
#if defined(BROTLI_ENCODER_EXIT_ON_OOM)
#define BROTLI_IS_OOM(M) (!!0)
#else /* BROTLI_ENCODER_EXIT_ON_OOM */
#define BROTLI_IS_OOM(M) (!!(M)->is_oom)
#endif /* BROTLI_ENCODER_EXIT_ON_OOM */
/*
BROTLI_IS_NULL is a fake check, BROTLI_IS_OOM does the heavy lifting.
The only purpose of it is to explain static analyzers the state of things.
NB: use ONLY together with BROTLI_IS_OOM
AND ONLY for allocations in the current scope.
*/
#if defined(__clang_analyzer__) && !defined(BROTLI_ENCODER_EXIT_ON_OOM)
#define BROTLI_IS_NULL(A) ((A) == nullptr)
#else /* defined(__clang_analyzer__) */
#define BROTLI_IS_NULL(A) (!!0)
#endif /* defined(__clang_analyzer__) */
BROTLI_INTERNAL void BrotliWipeOutMemoryManager(MemoryManager* m);
/*
Dynamically grows array capacity to at least the requested size
M: MemoryManager
T: data type
A: array
C: capacity
R: requested size
*/
#define BROTLI_ENSURE_CAPACITY(M, T, A, C, R) { \
if (C < (R)) { \
size_t _new_size = (C == 0) ? (R) : C; \
T* new_array; \
while (_new_size < (R)) _new_size *= 2; \
new_array = BROTLI_ALLOC((M), T, _new_size); \
if (!BROTLI_IS_OOM(M) && !BROTLI_IS_NULL(new_array) && C != 0) \
memcpy(new_array, A, C * sizeof(T)); \
BROTLI_FREE((M), A); \
A = new_array; \
C = _new_size; \
} \
}
/*
Appends value and dynamically grows array capacity when needed
M: MemoryManager
T: data type
A: array
C: array capacity
S: array size
V: value to append
*/
#define BROTLI_ENSURE_CAPACITY_APPEND(M, T, A, C, S, V) { \
(S)++; \
BROTLI_ENSURE_CAPACITY(M, T, A, C, S); \
A[(S) - 1] = (V); \
}
#if defined(__cplusplus) || defined(c_plusplus)
} /* extern "C" */
#endif
#endif /* BROTLI_ENC_MEMORY_H_ */
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