mirror of
https://github.com/vcmi/vcmi.git
synced 2025-01-14 02:33:51 +02:00
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
#include <SDL_endian.h>
|
|
|
|
/* Reading values from memory.
|
|
*
|
|
* read_le_u16, read_le_u32 : read a little endian value from
|
|
* memory. On big endian machines, the value will be byteswapped.
|
|
*/
|
|
|
|
#if defined(linux) && defined(sparc)
|
|
/* SPARC does not support unaligned memory access. Let gcc know when
|
|
* to emit the right code. */
|
|
struct unaligned_Uint16 { ui16 val __attribute__(( packed )); };
|
|
struct unaligned_Uint32 { ui32 val __attribute__(( packed )); };
|
|
|
|
static inline ui16 read_unaligned_u16(const void *p)
|
|
{
|
|
const struct unaligned_Uint16 *v = reinterpret_cast<const struct unaligned_Uint16 *>(p);
|
|
return v->val;
|
|
}
|
|
|
|
static inline ui32 read_unaligned_u32(const void *p)
|
|
{
|
|
const struct unaligned_Uint32 *v = reinterpret_cast<const struct unaligned_Uint32 *>(p);
|
|
return v->val;
|
|
}
|
|
|
|
#define read_le_u16(p) (SDL_SwapLE16(read_unaligned_u16(p)))
|
|
#define read_le_u32(p) (SDL_SwapLE32(read_unaligned_u32(p)))
|
|
|
|
#else
|
|
#define read_le_u16(p) (SDL_SwapLE16(* reinterpret_cast<const ui16 *>(p)))
|
|
#define read_le_u32(p) (SDL_SwapLE32(* reinterpret_cast<const ui32 *>(p)))
|
|
#endif
|