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extract.h
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C/C++ Source or Header
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1988-04-26
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1KB
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41 lines
/* These macros are for extracting an integer of a certain type
* from the midst of an arbitrary chunk of memory.
*
* Due to the offset based Macintosh resource system you have to
* do this a lot...
*
*/
#define UC(p) ((unsigned char *)(p))
#ifdef MPU68000
/* this will work on any machine with 68000 style endain ordering */
/* p should be a pointer to char */
#define X_ULONG(p) (*((ULONG *)(p)))
#define X_UWORD(p) (*((UWORD *)(p)))
#define X_UBYTE(p) (*((UBYTE *)(p)))
#define X_LONG(p) (*((LONG *)(p)))
#define X_WORD(p) (*((WORD *)(p)))
#define X_BYTE(p) (*((BYTE *)(p)))
#else
/* this will work on any machine but it's not as fast as the above */
#define X_ULONG(p) (ULONG)(UC(p)[0]<<24|UC(p)[1]<<16|UC(p)[2]<<8|UC(p)[3])
#define X_UWORD(p) (UWORD)(UC(p)[0]<<8|UC(p)[1])
#define X_UBYTE(p) (UBYTE)(UC(p)[0])
#define X_LONG(p) (LONG)((UC(p)[0]<<24|UC(p)[1]<<16|UC(p)[2]<<8|UC(p)[3])
#define X_WORD(p) (WORD)(UC(p)[0]<<8|UC(p)[1])
#define X_BYTE(p) (BYTE)(UC(p)[0])
#endif
/* artificial types... have to fake them */
#define X_UTRIP(p) (ULONG)(UC(p)[0]<<16|UC(p)[1]<<8|UC(p)[2])
#define X_TRIP(p) (LONG)(UC(p)[0]<<16|UC(p)[1]<<8|UC(p)[2])