home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 2001, 2002, 2003 by Hans Reiser, licensing governed by
- libaal/COPYING.
-
- endian.h -- endianess translation macros. This is a number of macro because
- macro is better for performance than to use functions which are determining
- the translation kind in the run time. */
-
- #ifndef AAL_ENDIAN_H
- #define AAL_ENDIAN_H
-
- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif
-
- #include <aal/types.h>
-
- #define __aal_get_octave(x, n) ( ((x) >> (8 * (n))) & 0xff )
-
- #define __aal_swap16(x) ( (__aal_get_octave(x, 0) << 8) \
- + (__aal_get_octave(x, 1) << 0) )
-
- #define __aal_swap32(x) ( (__aal_get_octave(x, 0) << 24) \
- + (__aal_get_octave(x, 1) << 16) \
- + (__aal_get_octave(x, 2) << 8) \
- + (__aal_get_octave(x, 3) << 0) )
-
- #define __aal_swap64(x) ( (__aal_get_octave(x, 0) << 56) \
- + (__aal_get_octave(x, 1) << 48) \
- + (__aal_get_octave(x, 2) << 40) \
- + (__aal_get_octave(x, 3) << 32) \
- + (__aal_get_octave(x, 4) << 24) \
- + (__aal_get_octave(x, 5) << 16) \
- + (__aal_get_octave(x, 6) << 8) \
- + (__aal_get_octave(x, 7) << 0) )
-
- #define aal_swap16(x) ((uint16_t) __aal_swap16((uint16_t)x))
- #define aal_swap32(x) ((uint32_t) __aal_swap32((uint32_t)x))
- #define aal_swap64(x) ((uint64_t) __aal_swap64((uint64_t)x))
-
- /*
- Endianess is determined by configure script in the configuring time, that is
- before compiling the package.
- */
- #ifdef WORDS_BIGENDIAN
-
- # define CPU_TO_LE16(x) aal_swap16(x)
- # define CPU_TO_BE16(x) (x)
- # define CPU_TO_LE32(x) aal_swap32(x)
- # define CPU_TO_BE32(x) (x)
- # define CPU_TO_LE64(x) aal_swap64(x)
- # define CPU_TO_BE64(x) (x)
-
- # define LE16_TO_CPU(x) aal_swap16(x)
- # define BE16_TO_CPU(x) (x)
- # define LE32_TO_CPU(x) aal_swap32(x)
- # define BE32_TO_CPU(x) (x)
- # define LE64_TO_CPU(x) aal_swap64(x)
- # define BE64_TO_CPU(x) (x)
-
- #else
-
- # define CPU_TO_LE16(x) (x)
- # define CPU_TO_BE16(x) aal_swap16(x)
- # define CPU_TO_LE32(x) (x)
- # define CPU_TO_BE32(x) aal_swap32(x)
- # define CPU_TO_LE64(x) (x)
- # define CPU_TO_BE64(x) aal_swap64(x)
-
- # define LE16_TO_CPU(x) (x)
- # define BE16_TO_CPU(x) aal_swap16(x)
- # define LE32_TO_CPU(x) (x)
- # define BE32_TO_CPU(x) aal_swap32(x)
- # define LE64_TO_CPU(x) (x)
- # define BE64_TO_CPU(x) aal_swap64(x)
-
- #endif
-
- #define aal_get_leXX(xx, p, field) (LE##xx##_TO_CPU (get_unaligned((&(p)->field))))
- #define aal_set_leXX(xx, p, field, val) put_unaligned(CPU_TO_LE##xx(val), (&(p)->field))
-
- #define aal_get_le16(p, field) aal_get_leXX(16, p, field)
- #define aal_set_le16(p, field, val) aal_set_leXX(16, p, field, val)
-
- #define aal_get_le32(p, field) aal_get_leXX(32, p, field)
- #define aal_set_le32(p, field, val) aal_set_leXX(32, p, field, val)
-
- #define aal_get_le64(p, field) aal_get_leXX(64, p, field)
- #define aal_set_le64(p, field, val) aal_set_leXX(64, p, field, val)
-
- #endif
-