68 lines
3.6 KiB
C
68 lines
3.6 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* Automatique. Distributed only by permission. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* Swap byte-order in 16-bit, 32-bit and 64-bit words */
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#ifndef _reverse_
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#define _reverse_
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#define Reverse_short(s) { \
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char * _p; \
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int _a; \
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_p = (char *) (s); \
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_a = _p[0]; \
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_p[0] = _p[1]; \
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_p[1] = _a; \
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}
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#define Reverse_int32(w) { \
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char * _p; \
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int _a; \
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_p = (char *) (w); \
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_a = _p[0]; \
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_p[0] = _p[3]; \
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_p[3] = _a; \
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_a = _p[1]; \
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_p[1] = _p[2]; \
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_p[2] = _a; \
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}
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#define Reverse_int64(d) { \
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char * _p; \
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int _a; \
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_p = (char *) (d); \
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_a = _p[0]; \
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_p[0] = _p[7]; \
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_p[7] = _a; \
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_a = _p[1]; \
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_p[1] = _p[6]; \
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_p[6] = _a; \
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_a = _p[2]; \
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_p[2] = _p[5]; \
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_p[5] = _a; \
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_a = _p[3]; \
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_p[3] = _p[4]; \
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_p[4] = _a; \
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}
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#ifdef ARCH_SIXTYFOUR
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#define Reverse_word Reverse_int64
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#else
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#define Reverse_word Reverse_int32
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#endif
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#define Reverse_double Reverse_int64
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#endif /* _reverse_ */
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