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/* macros.h
*
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#ifndef NETTLE_MACROS_H_INCLUDED
#define NETTLE_MACROS_H_INCLUDED
/* Reads a 32-bit integer, in network, big-endian, byte order */
#define READ_UINT32(p) \
( (((uint32_t) (p)[0]) << 24) \
| (((uint32_t) (p)[1]) << 16) \
| (((uint32_t) (p)[2]) << 8) \
| ((uint32_t) (p)[3]))
#define WRITE_UINT32(p, i) \
do { \
(p)[0] = ((i) >> 24) & 0xff; \
(p)[1] = ((i) >> 16) & 0xff; \
(p)[2] = ((i) >> 8) & 0xff; \
(p)[3] = (i) & 0xff; \
} while(0)
/* Analogous macros, for 24 and 16 bit numbers */
#define READ_UINT24(p) \
( (((uint32_t) (p)[0]) << 16) \
| (((uint32_t) (p)[1]) << 8) \
| ((uint32_t) (p)[2]))
#define WRITE_UINT24(p, i) \
do { \
(p)[0] = ((i) >> 16) & 0xff; \
(p)[1] = ((i) >> 8) & 0xff; \
(p)[2] = (i) & 0xff; \
} while(0)
#define READ_UINT16(p) \
( (((uint32_t) (p)[0]) << 8) \
| ((uint32_t) (p)[1]))
#define WRITE_UINT16(p, i) \
do { \
(p)[0] = ((i) >> 8) & 0xff; \
(p)[1] = (i) & 0xff; \
} while(0)
/* And the other, little-endian, byteorder */
#define LE_READ_UINT32(p) \
( (((uint32_t) (p)[3]) << 24) \
| (((uint32_t) (p)[2]) << 16) \
| (((uint32_t) (p)[1]) << 8) \
| ((uint32_t) (p)[0]))
#define LE_WRITE_UINT32(p, i) \
do { \
(p)[3] = ((i) >> 24) & 0xff; \
(p)[2] = ((i) >> 16) & 0xff; \
(p)[1] = ((i) >> 8) & 0xff; \
(p)[0] = (i) & 0xff; \
} while(0)
/* Analogous macros, for 16 bit numbers */
#define LE_READ_UINT16(p) \
( (((uint32_t) (p)[1]) << 8) \
| ((uint32_t) (p)[0]))
#define LE_WRITE_UINT16(p, i) \
do { \
(p)[1] = ((i) >> 8) & 0xff; \
(p)[0] = (i) & 0xff; \
} while(0)
/* Macro to make it easier to loop over several blocks. */
#define FOR_BLOCKS(length, dst, src, blocksize) \
assert( !((length) % (blocksize))); \
for (; (length); ((length) -= (blocksize), \
(dst) += (blocksize), \
(src) += (blocksize)) )
#endif /* NETTLE_MACROS_H_INCLUDED */
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