dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-14 21:09:55 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

introduce WebPMemToUint32 and WebPUint32ToMem for memory access

Browse Source 
it uses memcpy() when unaligned memory write is tricky

Change-Id: I5d966ca9d19e9b43ac90140fa487824116982874
This commit is contained in:
Pascal Massimino
2015-12-02 12:09:06 +01:00
parent 010ca3d10d
commit 2c08aac81a
11 changed files with 112 additions and 108 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/utils/utils.h
View File

@ -15,6 +15,10 @@
#ifndef WEBP_UTILS_UTILS_H_
#define WEBP_UTILS_UTILS_H_
#ifdef HAVE_CONFIG_H
#include "../webp/config.h"
#endif
#include <assert.h>
#include "../webp/types.h"
@ -49,6 +53,26 @@ WEBP_EXTERN(void) WebPSafeFree(void* const ptr);
#define WEBP_ALIGN_CST 31
#define WEBP_ALIGN(PTR) ((uintptr_t)((PTR) + WEBP_ALIGN_CST) & ~WEBP_ALIGN_CST)
#if defined(WEBP_FORCE_ALIGNED)
#include <string.h>
// memcpy() is the safe way of moving potentially unaligned 32b memory.
static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) {
uint32_t A;
memcpy(&A, (const int*)ptr, sizeof(A));
return A;
}
static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
memcpy(ptr, &val, sizeof(val));
}
#else
static WEBP_INLINE uint32_t WebPMemToUint32(const uint8_t* const ptr) {
return *(const uint32_t*)ptr;
}
static WEBP_INLINE void WebPUint32ToMem(uint8_t* const ptr, uint32_t val) {
*(uint32_t*)ptr = val;
}
#endif
//------------------------------------------------------------------------------
// Reading/writing data.