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