84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
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// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Misc. common utility functions
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//
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// Authors: Skal (pascal.massimino@gmail.com)
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// Urvang (urvang@google.com)
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#ifndef WEBP_UTILS_UTILS_H_
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#define WEBP_UTILS_UTILS_H_
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#include <assert.h>
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#include "../webp/types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//------------------------------------------------------------------------------
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// Memory allocation
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// This is the maximum memory amount that libwebp will ever try to allocate.
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#define WEBP_MAX_ALLOCABLE_MEMORY (1ULL << 40)
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// size-checking safe malloc/calloc: verify that the requested size is not too
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// large, or return NULL. You don't need to call these for constructs like
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// malloc(sizeof(foo)), but only if there's picture-dependent size involved
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// somewhere (like: malloc(num_pixels * sizeof(*something))). That's why this
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// safe malloc() borrows the signature from calloc(), pointing at the dangerous
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// underlying multiply involved.
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void* WebPSafeMalloc(uint64_t nmemb, size_t size);
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// Note that WebPSafeCalloc() expects the second argument type to be 'size_t'
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// in order to favor the "calloc(num_foo, sizeof(foo))" pattern.
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void* WebPSafeCalloc(uint64_t nmemb, size_t size);
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//------------------------------------------------------------------------------
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// Reading/writing data.
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// Read 16, 24 or 32 bits stored in little-endian order.
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static WEBP_INLINE int GetLE16(const uint8_t* const data) {
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return (int)(data[0] << 0) | (data[1] << 8);
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}
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static WEBP_INLINE int GetLE24(const uint8_t* const data) {
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return GetLE16(data) | (data[2] << 16);
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}
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static WEBP_INLINE uint32_t GetLE32(const uint8_t* const data) {
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return (uint32_t)GetLE16(data) | (GetLE16(data + 2) << 16);
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}
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// Store 16, 24 or 32 bits in little-endian order.
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static WEBP_INLINE void PutLE16(uint8_t* const data, int val) {
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assert(val < (1 << 16));
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data[0] = (val >> 0);
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data[1] = (val >> 8);
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}
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static WEBP_INLINE void PutLE24(uint8_t* const data, int val) {
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assert(val < (1 << 24));
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PutLE16(data, val & 0xffff);
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data[2] = (val >> 16);
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}
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static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
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PutLE16(data, (int)(val & 0xffff));
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PutLE16(data + 2, (int)(val >> 16));
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}
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//------------------------------------------------------------------------------
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* WEBP_UTILS_UTILS_H_ */
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