40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
// üPlatform.h
|
|
//
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
#if !defined(_PLATFORM_INCLUDED_)
|
|
#define _PLATFORM_INCLUDED_
|
|
|
|
#if _MSC_VER > 1000
|
|
#pragma once
|
|
#endif // _MSC_VER > 1000
|
|
|
|
#ifdef _X86_
|
|
// X86 allows unaligned accesses, so we can just dereference any pointer
|
|
// after a cast
|
|
#define GET16(pc) (*(WORD *)(pc))
|
|
#define GET32(pc) (*(DWORD *)(pc))
|
|
#define GET64(pc) (*(DWORD64 *)(pc))
|
|
#else // not _X86_
|
|
// Other platforms (IPF and AMD64) either have a have a significant penalty
|
|
// for unaligned accesses or they may trap to the OS).
|
|
// For these platformsm we put the bytes together to make 16, 32 and 64 bit
|
|
// objects. We assume little-endian data.
|
|
#define GET16(pc) ((WORD)(*(unsigned char *)(pc)) | \
|
|
((*(unsigned char *)((pc) + 1)) << 8))
|
|
#define GET32(pc) ((DWORD)(*(unsigned char *)(pc)) | \
|
|
((*(unsigned char *)((pc) + 1)) << 8) | \
|
|
((*(unsigned char *)((pc) + 2)) << 16) | \
|
|
((*(unsigned char *)((pc) + 3)) << 24))
|
|
#define GET64(pc) ((DWORD64)(*(unsigned char *)(pc)) | \
|
|
((*(unsigned char *)((pc) + 1)) << 8) | \
|
|
((*(unsigned char *)((pc) + 2)) << 16) | \
|
|
((*(unsigned char *)((pc) + 3)) << 24) | \
|
|
((*(unsigned char *)((pc) + 4)) << 32) | \
|
|
((*(unsigned char *)((pc) + 5)) << 40) | \
|
|
((*(unsigned char *)((pc) + 6)) << 48) | \
|
|
((*(unsigned char *)((pc) + 7)) << 56))
|
|
#endif // if _X86_ ... else not _X86_ ...
|
|
|
|
#endif // !defined(_PLATFORM_INCLUDED_)
|