+++ /dev/null
-/* -*-c-*-
- *
- * Portable bit-level manipulation macros
- *
- * (c) 1998 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of the mLib utilities library.
- *
- * mLib is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * mLib is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with mLib; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-#ifndef MLIB_BITS_H
-#define MLIB_BITS_H
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <limits.h>
-#include <stddef.h>
-#if __STDC_VERSION__ >= 199900l
-# include <stdint.h>
-#endif
-
-/*----- Decide on some types ----------------------------------------------*/
-
-/* --- Make GNU C shut up --- */
-
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 91)
-# define MLIB_BITS_EXTENSION __extension__
-#else
-# define MLIB_BITS_EXTENSION
-#endif
-
-/* --- Decide on a 32-bit type --- *
- *
- * I want a type which is capable of expressing 32-bit numbers. Because some
- * implementations have 64-bit @long@s (infinitely preferable to the abortion
- * that is @long long@), using @unsigned long@ regardless is wasteful. So,
- * if @int@ appears to be good enough, then I'll go with that.
- */
-
-#if UINT_MAX >= 0xffffffffu
- typedef unsigned int uint32;
-#else
- 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
- MLIB_BITS_EXTENSION 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.
- */
-
-typedef unsigned short uint16;
-typedef unsigned char octet, uint8;
-
-/* --- WARNING! --- *
- *
- * Never lose sight of the fact that the above types may be wider than the
- * names suggest. Some architectures have 32-bit @short@s for example.
- */
-
-/*----- Macros ------------------------------------------------------------*/
-
-/* --- Useful masks --- */
-
-#define MASK8 0xffu
-#define MASK16 0xffffu
-#define MASK16_L MASK16
-#define MASK16_B MASK16
-#define MASK24 0xffffffu
-#define MASK24_L MASK24
-#define MASK24_B MASK24
-#define MASK32 0xffffffffu
-#define MASK32_L MASK32
-#define MASK32_B MASK32
-
-#ifdef HAVE_UINT64
-# define MASK64 MLIB_BITS_EXTENSION 0xffffffffffffffffu
-# define MASK64_L MASK64
-# define MASK64_B MASK64
-#endif
-
-/* --- Sizes --- */
-
-#define SZ_8 1
-#define SZ_16 2
-#define SZ_16_L 2
-#define SZ_16_B 2
-#define SZ_24 3
-#define SZ_24_L 3
-#define SZ_24_B 3
-#define SZ_32 4
-#define SZ_32_L 4
-#define SZ_32_B 4
-
-#ifdef HAVE_UINT64
-# define SZ_64 8
-# define SZ_64_L 8
-# define SZ_64_B 8
-#endif
-
-/* --- Type aliases --- */
-
-#define TY_U8 octet
-#define TY_U16 uint16
-#define TY_U16_L uint16
-#define TY_U16_B uint16
-#define TY_U24 uint24
-#define TY_U24_L uint24
-#define TY_U24_B uint24
-#define TY_U32 uint32
-#define TY_U32_L uint32
-#define TY_U32_B uint32
-
-#ifdef HAVE_UINT64
-# define TY_U64 uint64
-# define TY_U64_L uint64
-# define TY_U64_B uint64
-#endif
-
-/* --- List macros --- */
-
-#ifdef HAVE_UINT64
-# define DOUINTCONV(_) \
- _(8, 8, 8) \
- _(16, 16, 16) _(16, 16_L, 16l) _(16, 16_B, 16b) \
- _(24, 24, 24) _(24, 24_L, 24l) _(24, 24_B, 24b) \
- _(32, 32, 32) _(32, 32_L, 32l) _(32, 32_B, 32b) \
- _(64, 64, 64) _(64, 64_L, 64l) _(64, 64_B, 64b)
-# define DOUINTSZ(_) _(8) _(16) _(24) _(32) _(64)
-#else
-# define DOUINTCONV(_) \
- _(8, 8, 8) \
- _(16, 16, 16) _(16, 16_L, 16l) _(16, 16_B, 16b) \
- _(24, 24, 24) _(24, 24_L, 24l) _(24, 24_B, 24b) \
- _(32, 32, 32) _(32, 32_L, 32l) _(32, 32_B, 32b)
-# define DOUINTSZ(_) _(8) _(16) _(24) _(32)
-#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 if (_s == 32) { \
- _d->lo = _h; \
- _d->hi = _l; \
- } 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 if (_s == 32) { \
- _d->lo = _h; \
- _d->hi = _l; \
- } 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 PUTBYTE(p, o, v) (((octet *)(p))[o] = U8((v)))
-
-#define LOAD8(p) (GETBYTE((p), 0))
-#define STORE8(p, v) (PUTBYTE((p), 0, (v)))
-
-#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, (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) \
- (((uint32)GETBYTE((p), 0) << 24) | \
- ((uint32)GETBYTE((p), 1) << 16) | \
- ((uint32)GETBYTE((p), 2) << 8) | \
- ((uint32)GETBYTE((p), 3) << 0))
-#define LOAD32_L(p) \
- (((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, (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, (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)
-# define GET64(t, x) ((t)(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)
-# define GET64(t, x) (((((t)HI64(x) << 16) << 16) & ~MASK32) | (t)LO64(x))
-#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
-
-/* --- Storing integers in tables --- */
-
-#ifdef HAVE_UINT64
-# define X64(x, y) { 0x##x##y }
-#else
-# define X64(x, y) { 0x##x, 0x##y }
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
~mdw / mLib / blobdiff