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Fix ByteswapX utility functions, add signed versions

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This commit is contained in:
Iliyas Jorio 2021-02-25 21:30:23 +01:00
parent 79ee6c1163
commit 6399e16cc6
1 changed files with 34 additions and 14 deletions
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48
src/Utilities/structpack.h
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@ -28,24 +28,44 @@ int ByteswapStructs(const char* format, int structSize, int structCount, void* b
int ByteswapInts(int intSize, int intCount, void* buffer); int ByteswapInts(int intSize, int intCount, void* buffer);
static inline uint16_t Byteswap16(const void* p) static inline uint16_t Byteswap16(const void* data)
{ {
uint16_t v; const uint8_t* p = (uint8_t*) data;
v = return ( p[0] << 8 )
(*(const uint8_t*) p) | ( p[1] );
| ((*(const uint8_t*) p + 1) << 8);
return v;
} }
static inline uint32_t Byteswap32(const void* p) static inline int16_t Byteswap16Signed(const void* data)
{ {
uint32_t v; return (int16_t) Byteswap16(data);
v = }
(*(const uint8_t*) p)
| ((*(const uint8_t*) p + 1) << 8) static inline int32_t Byteswap16SignedRW(void* data)
| ((*(const uint8_t*) p + 2) << 16) {
| ((*(const uint8_t*) p + 3) << 24); int16_t result = Byteswap16Signed(data);
return v; *(int16_t*) data = result;
return result;
}
static inline uint32_t Byteswap32(const void* data)
{
const uint8_t* p = (uint8_t*) data;
return ( p[0] << 24 )
| ( p[1] << 16 )
| ( p[2] << 8 )
| ( p[3] );
}
static inline int32_t Byteswap32Signed(const void* data)
{
return (int32_t) Byteswap32(data);
}
static inline int32_t Byteswap32SignedRW(void* data)
{
int32_t result = Byteswap32Signed(data);
*(int32_t*) data = result;
return result;
} }
#ifdef __cplusplus #ifdef __cplusplus