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/*
integrit - file integrity verification system
Copyright (C) 2000, 2001 Ed L. Cashin
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* pack and unpack numbers from unsigned 32-bit native-format integers
* into little-endian 32-bit representation for storage in CDB-format
* database.
*/
#ifndef ELC_PACKINT_H
#define ELC_PACKINT_H
/* based on macro from glib */
#define UINT32_SWAP_BYTES_LE_BE(val) ((uint32_t) ( \
(((uint32_t) (val) & (uint32_t) 0x000000ffU) << 24) | \
(((uint32_t) (val) & (uint32_t) 0x0000ff00U) << 8) | \
(((uint32_t) (val) & (uint32_t) 0x00ff0000U) >> 8) | \
(((uint32_t) (val) & (uint32_t) 0xff000000U) >> 24)))
#if BIG_ENDIAN_HOST
#define UINT32_UNPACK(in, n) do { \
uint32_t tmpint = *((uint32_t *) (in)); \
(*(n)) = UINT32_SWAP_BYTES_LE_BE(tmpint); \
} while (0)
#elif LITTLE_ENDIAN_HOST
#define UINT32_UNPACK(in, n) do { \
*(n) = *((uint32_t *) (in)); \
} while (0)
#else
#error Unsupported byte order
#endif
#if BIG_ENDIAN_HOST
#define UINT32_PACK(b, n) do { \
uint32_t tmpuint = (uint32_t)(n); \
*((uint32_t *) (b)) = UINT32_SWAP_BYTES_LE_BE(tmpuint); \
} while (0)
#elif LITTLE_ENDIAN_HOST
#define UINT32_PACK(b, n) do { \
*((uint32_t *) (b)) = (n); \
} while (0)
#else
#error Unsupported byte order
#endif
#endif
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