/* -*-c-*-
*
- * $Id: bits.h,v 1.2 1999/06/17 00:12:46 mdw Exp $
+ * $Id: bits.h,v 1.6 2000/07/16 12:28:28 mdw Exp $
*
* Portable bit-level manipulation macros
*
/*----- Revision history --------------------------------------------------*
*
* $Log: bits.h,v $
+ * Revision 1.6 2000/07/16 12:28:28 mdw
+ * Add 64-bit support, with faked arithmetic on 32-bit hosts.
+ *
+ * Revision 1.5 2000/06/17 10:36:06 mdw
+ * Support for 24-bit types.
+ *
+ * Revision 1.4 1999/12/10 23:42:04 mdw
+ * Change header file guard names.
+ *
+ * Revision 1.3 1999/06/20 23:31:52 mdw
+ * More portability enhancements.
+ *
* Revision 1.2 1999/06/17 00:12:46 mdw
* Improve portability for shift and rotate macros.
*
*
*/
-#ifndef BITS_H
-#define BITS_H
+#ifndef MLIB_BITS_H
+#define MLIB_BITS_H
#ifdef __cplusplus
extern "C" {
#include <limits.h>
#include <stddef.h>
+#if __STDC_VERSION__ >= 199900l
+# include <stdint.h>
+#endif
/*----- Decide on some types ----------------------------------------------*/
typedef unsigned long uint32;
#endif
+/* --- Decide on a 64-bit type --- *
+ *
+ * The test is quite subtle. Think about it. Note that (at least on my
+ * machine), the 32-bit macros are *much* faster than GCC's @long long@
+ * support.
+ */
+
+#if defined(ULONG_LONG_MAX) && !defined(ULLONG_MAX)
+# define ULLONG_MAX ULONG_LONG_MAX
+#endif
+
+#if UINT_MAX >> 31 > 0xffffffff
+# define HAVE_UINT64
+ typedef unsigned int uint64;
+#elif ULONG_MAX >> 31 > 0xffffffff
+# define HAVE_UINT64
+ typedef unsigned long uint64;
+#elif defined(ULLONG_MAX)
+# define HAVE_UINT64
+ typedef unsigned long long uint64;
+#endif
+
+#ifdef DEBUG64
+# undef HAVE_UINT64
+#endif
+
+#ifdef HAVE_UINT64
+ typedef struct { uint64 i; } kludge64;
+#else
+ typedef struct { uint32 hi, lo; } kludge64;
+#endif
+
+/* --- Decide on a 24-bit type --- */
+
+#if UINT_MAX >= 0x00ffffffu
+ typedef unsigned int uint24;
+#else
+ typedef unsigned long uint24;
+#endif
+
/* --- Decide on 16-bit and 8-bit types --- *
*
* This is more for brevity than anything else.
#define MASK8 0xffu
#define MASK16 0xffffu
+#define MASK24 0xffffffu
#define MASK32 0xffffffffu
+#ifdef HAVE_UINT64
+# define MASK64 0xffffffffffffffffull
+#endif
+
/* --- Type coercions --- */
#define U8(x) ((octet)((x) & MASK8))
#define U16(x) ((uint16)((x) & MASK16))
+#define U24(x) ((uint24)((x) & MASK24))
#define U32(x) ((uint32)((x) & MASK32))
+#ifdef HAVE_UINT64
+# define U64(x) ((uint64)(x) & MASK64)
+# define U64_(d, x) ((d).i = U64(x).i)
+#else
+# define U64_(d, x) ((d).hi = U32((x).hi), (d).lo = U32((x).lo))
+#endif
+
/* --- Safe shifting macros --- */
#define LSL8(v, s) U8(U8(v) << ((s) & 7u))
#define LSR8(v, s) U8(U8(v) >> ((s) & 7u))
#define LSL16(v, s) U16(U16(v) << ((s) & 15u))
#define LSR16(v, s) U16(U16(v) >> ((s) & 15u))
+#define LSL24(v, s) U24(U24(v) << ((s) % 24u))
+#define LSR24(v, s) U24(U24(v) >> ((s) % 24u))
#define LSL32(v, s) U32(U32(v) << ((s) & 31u))
#define LSR32(v, s) U32(U32(v) >> ((s) & 31u))
+#ifdef HAVE_UINT64
+# define LSL64(v, s) U64(U64(v) << ((s) & 63u))
+# define LSR64(v, s) U64(U64(v) >> ((s) & 63u))
+# define LSL64_(d, v, s) ((d).i = LSL64((v).i, (s)))
+# define LSR64_(d, v, s) ((d).i = LSR64((v).i, (s)))
+#else
+# define LSL64_(d, v, s) do { \
+ unsigned _s = (s) & 63u; \
+ uint32 _l = (v).lo, _h = (v).hi; \
+ kludge64 *_d = &(d); \
+ if (_s >= 32) { \
+ _d->hi = LSL32(_l, _s - 32u); \
+ _d->lo = 0; \
+ } else if (!_s) { \
+ _d->lo = _l; \
+ _d->hi = _h; \
+ } else { \
+ _d->hi = LSL32(_h, _s) | LSR32(_l, 32u - _s); \
+ _d->lo = LSL32(_l, _s); \
+ } \
+ } while (0)
+# define LSR64_(d, v, s) do { \
+ unsigned _s = (s) & 63u; \
+ uint32 _l = (v).lo, _h = (v).hi; \
+ kludge64 *_d = &(d); \
+ if (_s >= 32) { \
+ _d->lo = LSR32(_h, _s - 32u); \
+ _d->hi = 0; \
+ } else if (!_s) { \
+ _d->lo = _l; \
+ _d->hi = _h; \
+ } else { \
+ _d->lo = LSR32(_l, _s) | LSL32(_h, 32u - _s); \
+ _d->hi = LSR32(_h, _s); \
+ } \
+ } while (0)
+#endif
+
/* --- Rotation macros --- */
#define ROL8(v, s) (LSL8((v), (s)) | (LSR8((v), 8u - (s))))
#define ROR8(v, s) (LSR8((v), (s)) | (LSL8((v), 8u - (s))))
#define ROL16(v, s) (LSL16((v), (s)) | (LSR16((v), 16u - (s))))
#define ROR16(v, s) (LSR16((v), (s)) | (LSL16((v), 16u - (s))))
+#define ROL24(v, s) (LSL24((v), (s)) | (LSR24((v), 24u - (s))))
+#define ROR24(v, s) (LSR24((v), (s)) | (LSL24((v), 24u - (s))))
#define ROL32(v, s) (LSL32((v), (s)) | (LSR32((v), 32u - (s))))
#define ROR32(v, s) (LSR32((v), (s)) | (LSL32((v), 32u - (s))))
+#ifdef HAVE_UINT64
+# define ROL64(v, s) (LSL64((v), (s)) | (LSR64((v), 64u - (s))))
+# define ROR64(v, s) (LSR64((v), (s)) | (LSL64((v), 64u - (s))))
+# define ROL64_(d, v, s) ((d).i = ROL64((v).i, (s)))
+# define ROR64_(d, v, s) ((d).i = ROR64((v).i, (s)))
+#else
+# define ROL64_(d, v, s) do { \
+ unsigned _s = (s) & 63u; \
+ uint32 _l = (v).lo, _h = (v).hi; \
+ kludge64 *_d = &(d); \
+ if (_s >= 32) { \
+ _d->hi = LSL32(_l, _s - 32u) | LSR32(_h, 64u - _s); \
+ _d->lo = LSL32(_h, _s - 32u) | LSR32(_l, 64u - _s); \
+ } else if (!_s) { \
+ _d->lo = _l; \
+ _d->hi = _h; \
+ } else { \
+ _d->hi = LSL32(_h, _s) | LSR32(_l, 32u - _s); \
+ _d->lo = LSL32(_l, _s) | LSR32(_h, 32u - _s); \
+ } \
+ } while (0)
+# define ROR64_(d, v, s) do { \
+ unsigned _s = (s) & 63u; \
+ uint32 _l = (v).lo, _h = (v).hi; \
+ kludge64 *_d = &(d); \
+ if (_s >= 32) { \
+ _d->hi = LSR32(_l, _s - 32u) | LSL32(_h, 64u - _s); \
+ _d->lo = LSR32(_h, _s - 32u) | LSL32(_l, 64u - _s); \
+ } else if (!_s) { \
+ _d->lo = _l; \
+ _d->hi = _h; \
+ } else { \
+ _d->hi = LSR32(_h, _s) | LSL32(_l, 32u - _s); \
+ _d->lo = LSR32(_l, _s) | LSL32(_h, 32u - _s); \
+ } \
+ } while (0)
+#endif
+
/* --- Storage and retrieval --- */
#define GETBYTE(p, o) (((octet *)(p))[o] & MASK8)
#define LOAD8(p) (GETBYTE((p), 0))
#define STORE8(p, v) (PUTBYTE((p), 0, (v)))
-#define LOAD16_B(p) ((GETBYTE((p), 0) << 8) | GETBYTE((p), 1))
-#define LOAD16_L(p) (GETBYTE((p), 0) | (GETBYTE((p), 1) << 8))
+#define LOAD16_B(p) \
+ (((uint16)GETBYTE((p), 0) << 8) | \
+ ((uint16)GETBYTE((p), 1) << 0))
+#define LOAD16_L(p) \
+ (((uint16)GETBYTE((p), 0) << 0) | \
+ ((uint16)GETBYTE((p), 1) << 8))
#define LOAD16(p) LOAD16_B((p))
-#define STORE16_B(p, v) (PUTBYTE((p), 0, (v) >> 8), PUTBYTE((p), 1, (v)))
-#define STORE16_L(p, v) (PUTBYTE((p), 0, (v)), PUTBYTE((p), 1, (v) >> 8))
+#define STORE16_B(p, v) \
+ (PUTBYTE((p), 0, (uint16)(v) >> 8), \
+ PUTBYTE((p), 1, (uint16)(v) >> 0))
+#define STORE16_L(p, v) \
+ (PUTBYTE((p), 0, (uint16)(v) >> 0), \
+ PUTBYTE((p), 1, (uint16)(v) >> 8))
#define STORE16(p, v) STORE16_B((p), (v))
+#define LOAD24_B(p) \
+ (((uint24)GETBYTE((p), 0) << 16) | \
+ ((uint24)GETBYTE((p), 1) << 8) | \
+ ((uint24)GETBYTE((p), 2) << 0))
+#define LOAD24_L(p) \
+ (((uint24)GETBYTE((p), 0) << 0) | \
+ ((uint24)GETBYTE((p), 1) << 8) | \
+ ((uint24)GETBYTE((p), 2) << 16))
+#define LOAD24(p) LOAD24_B((p))
+
+#define STORE24_B(p, v) \
+ (PUTBYTE((p), 0, (uint24)(v) >> 16), \
+ PUTBYTE((p), 1, (uint24)(v) >> 8), \
+ PUTBYTE((p), 2, (uint24)(v) >> 0))
+#define STORE24_L(p, v) \
+ (PUTBYTE((p), 0, (uint24)(v) >> 0), \
+ PUTBYTE((p), 1, (uint24)(v) >> 8), \
+ PUTBYTE((p), 2, (uint24)(v) >> 16))
+#define STORE24(p, v) STORE24_B((p), (v))
+
#define LOAD32_B(p) \
- ((GETBYTE((p), 0) << 24) | (GETBYTE((p), 1) << 16) | \
- (GETBYTE((p), 2) << 8) | (GETBYTE((p), 3) << 0))
+ (((uint32)GETBYTE((p), 0) << 24) | \
+ ((uint32)GETBYTE((p), 1) << 16) | \
+ ((uint32)GETBYTE((p), 2) << 8) | \
+ ((uint32)GETBYTE((p), 3) << 0))
#define LOAD32_L(p) \
- ((GETBYTE((p), 0) << 0) | (GETBYTE((p), 1) << 8) | \
- (GETBYTE((p), 2) << 16) | (GETBYTE((p), 3) << 24))
+ (((uint32)GETBYTE((p), 0) << 0) | \
+ ((uint32)GETBYTE((p), 1) << 8) | \
+ ((uint32)GETBYTE((p), 2) << 16) | \
+ ((uint32)GETBYTE((p), 3) << 24))
#define LOAD32(p) LOAD32_B((p))
#define STORE32_B(p, v) \
- (PUTBYTE((p), 0, (v) >> 24), PUTBYTE((p), 1, (v) >> 16), \
- PUTBYTE((p), 2, (v) >> 8), PUTBYTE((p), 3, (v) >> 0))
+ (PUTBYTE((p), 0, (uint32)(v) >> 24), \
+ PUTBYTE((p), 1, (uint32)(v) >> 16), \
+ PUTBYTE((p), 2, (uint32)(v) >> 8), \
+ PUTBYTE((p), 3, (uint32)(v) >> 0))
#define STORE32_L(p, v) \
- (PUTBYTE((p), 0, (v) >> 0), PUTBYTE((p), 1, (v) >> 8), \
- PUTBYTE((p), 2, (v) >> 16), PUTBYTE((p), 3, (v) >> 24))
+ (PUTBYTE((p), 0, (uint32)(v) >> 0), \
+ PUTBYTE((p), 1, (uint32)(v) >> 8), \
+ PUTBYTE((p), 2, (uint32)(v) >> 16), \
+ PUTBYTE((p), 3, (uint32)(v) >> 24))
#define STORE32(p, v) STORE32_B((p), (v))
+#ifdef HAVE_UINT64
+
+# define LOAD64_B(p) \
+ (((uint64)GETBYTE((p), 0) << 56) | \
+ ((uint64)GETBYTE((p), 1) << 48) | \
+ ((uint64)GETBYTE((p), 2) << 40) | \
+ ((uint64)GETBYTE((p), 3) << 32) | \
+ ((uint64)GETBYTE((p), 4) << 24) | \
+ ((uint64)GETBYTE((p), 5) << 16) | \
+ ((uint64)GETBYTE((p), 6) << 8) | \
+ ((uint64)GETBYTE((p), 7) << 0))
+# define LOAD64_L(p) \
+ (((uint64)GETBYTE((p), 0) << 0) | \
+ ((uint64)GETBYTE((p), 1) << 8) | \
+ ((uint64)GETBYTE((p), 2) << 16) | \
+ ((uint64)GETBYTE((p), 3) << 24) | \
+ ((uint64)GETBYTE((p), 4) << 32) | \
+ ((uint64)GETBYTE((p), 5) << 40) | \
+ ((uint64)GETBYTE((p), 6) << 48) | \
+ ((uint64)GETBYTE((p), 7) << 56))
+# define LOAD64(p) LOAD64_B((p))
+# define LOAD64_B_(d, p) ((d).i = LOAD64_B((p)))
+# define LOAD64_L_(d, p) ((d).i = LOAD64_L((p)))
+# define LOAD64_(d, p) LOAD64_B_((d), (p))
+
+# define STORE64_B(p, v) \
+ (PUTBYTE((p), 0, (uint64)(v) >> 56), \
+ PUTBYTE((p), 1, (uint64)(v) >> 48), \
+ PUTBYTE((p), 2, (uint64)(v) >> 40), \
+ PUTBYTE((p), 3, (uint64)(v) >> 32), \
+ PUTBYTE((p), 4, (uint64)(v) >> 24), \
+ PUTBYTE((p), 5, (uint64)(v) >> 16), \
+ PUTBYTE((p), 6, (uint64)(v) >> 8), \
+ PUTBYTE((p), 7, (uint64)(v) >> 0))
+# define STORE64_L(p, v) \
+ (PUTBYTE((p), 0, (uint64)(v) >> 0), \
+ PUTBYTE((p), 1, (uint64)(v) >> 8), \
+ PUTBYTE((p), 2, (uint64)(v) >> 16), \
+ PUTBYTE((p), 3, (uint64)(v) >> 24), \
+ PUTBYTE((p), 4, (uint64)(v) >> 32), \
+ PUTBYTE((p), 5, (uint64)(v) >> 40), \
+ PUTBYTE((p), 6, (uint64)(v) >> 48), \
+ PUTBYTE((p), 7, (uint64)(v) >> 56))
+# define STORE64(p, v) STORE64_B((p), (v))
+# define STORE64_B_(p, v) STORE64_B((p), (v).i)
+# define STORE64_L_(p, v) STORE64_L((p), (v).i)
+# define STORE64_(p, v) STORE64_B_((p), (v))
+
+#else
+
+# define LOAD64_B_(d, p) \
+ ((d).hi = LOAD32_B((octet *)(p) + 0), \
+ (d).lo = LOAD32_B((octet *)(p) + 4))
+# define LOAD64_L_(d, p) \
+ ((d).lo = LOAD32_L((octet *)(p) + 0), \
+ (d).hi = LOAD32_L((octet *)(p) + 4))
+# define LOAD64_(d, p) LOAD64_B_((d), (p))
+
+# define STORE64_B_(p, v) \
+ (STORE32_B((octet *)(p) + 0, (v).hi), \
+ STORE32_B((octet *)(p) + 4, (v).lo))
+# define STORE64_L_(p, v) \
+ (STORE32_L((octet *)(p) + 0, (v).lo), \
+ STORE32_L((octet *)(p) + 4, (v).hi))
+# define STORE64_(p, v) STORE64_B_((p), (v))
+
+#endif
+
+/* --- Other operations on 64-bit integers --- */
+
+#ifdef HAVE_UINT64
+# define SET64(d, h, l) ((d).i = (U64((h)) << 32) | U64((l)))
+# define ASSIGN64(d, x) ((d).i = U64((x)))
+# define HI64(x) U32((x).i >> 32)
+# define LO64(x) U32((x).i)
+#else
+# define SET64(d, h, l) ((d).hi = U32(h), (d).lo = U32(l))
+# define ASSIGN64(d, x) \
+ ((d).hi = ((x & ~MASK32) >> 16) >> 16, (d).lo = U32(x))
+# define HI64(x) U32((x).hi)
+# define LO64(x) U32((x).lo)
+#endif
+
+#ifdef HAVE_UINT64
+# define AND64(d, x, y) ((d).i = (x).i & (y).i)
+# define OR64(d, x, y) ((d).i = (x).i | (y).i)
+# define XOR64(d, x, y) ((d).i = (x).i ^ (y).i)
+# define CPL64(d, x) ((d).i = ~(x).i)
+# define ADD64(d, x, y) ((d).i = (x).i + (y).i)
+# define SUB64(d, x, y) ((d).i = (x).i - (y).i)
+# define CMP64(x, op, y) ((x).i op (y).i)
+# define ZERO64(x) ((x) == 0)
+#else
+# define AND64(d, x, y) ((d).lo = (x).lo & (y).lo, (d).hi = (x).hi & (y).hi)
+# define OR64(d, x, y) ((d).lo = (x).lo | (y).lo, (d).hi = (x).hi | (y).hi)
+# define XOR64(d, x, y) ((d).lo = (x).lo ^ (y).lo, (d).hi = (x).hi ^ (y).hi)
+# define CPL64(d, x) ((d).lo = ~(x).lo, (d).hi = ~(x).hi)
+# define ADD64(d, x, y) do { \
+ uint32 _x = U32((x).lo + (y).lo); \
+ (d).hi = (x).hi + (y).hi + (_x < (x).lo); \
+ (d).lo = _x; \
+ } while (0)
+# define SUB64(d, x, y) do { \
+ uint32 _x = U32((x).lo - (y).lo); \
+ (d).hi = (x).hi - (y).hi - (_x > (x).lo); \
+ (d).lo = _x; \
+ } while (0)
+# define CMP64(x, op, y) \
+ ((x).hi == (y).hi ? (x).lo op (y).lo : (x).hi op (y).hi)
+# define ZERO64(x) ((x).lo == 0 && (x).hi == 0)
+#endif
+
/*----- That's all, folks -------------------------------------------------*/
#ifdef __cplusplus
~mdw / mLib / blobdiff