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88 lines
2.5 KiB
88 lines
2.5 KiB
/* macros.h
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*
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*/
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/* nettle, low-level cryptographics library
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*
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* Copyright (C) 2001 Niels Müler
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*
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* The nettle library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The nettle library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the nettle library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#ifndef NETTLE_MACROS_H_INCLUDED
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#define NETTLE_MACROS_H_INCLUDED
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/* Reads a 32-bit integer, in network, big-endian, byte order */
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#define READ_UINT32(p) \
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( (((uint32_t) (p)[0]) << 24) \
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| (((uint32_t) (p)[1]) << 16) \
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| (((uint32_t) (p)[2]) << 8) \
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| ((uint32_t) (p)[3]))
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#define WRITE_UINT32(p, i) \
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do { \
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(p)[0] = ((i) >> 24) & 0xff; \
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(p)[1] = ((i) >> 16) & 0xff; \
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(p)[2] = ((i) >> 8) & 0xff; \
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(p)[3] = (i) & 0xff; \
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} while(0)
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/* Analogous macros, for 24 and 16 bit numbers */
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#define READ_UINT24(p) \
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( (((uint32_t) (p)[0]) << 16) \
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| (((uint32_t) (p)[1]) << 8) \
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| ((uint32_t) (p)[2]))
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#define WRITE_UINT24(p, i) \
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do { \
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(p)[0] = ((i) >> 16) & 0xff; \
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(p)[1] = ((i) >> 8) & 0xff; \
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(p)[2] = (i) & 0xff; \
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} while(0)
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#define READ_UINT16(p) \
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( (((uint32_t) (p)[0]) << 8) \
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| ((uint32_t) (p)[1]))
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#define WRITE_UINT16(p, i) \
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do { \
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(p)[0] = ((i) >> 8) & 0xff; \
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(p)[1] = (i) & 0xff; \
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} while(0)
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/* And the other, little-endian, byteorder */
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#define LE_READ_UINT32(p) \
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( (((uint32_t) (p)[3]) << 24) \
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| (((uint32_t) (p)[2]) << 16) \
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| (((uint32_t) (p)[1]) << 8) \
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| ((uint32_t) (p)[0]))
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#define LE_WRITE_UINT32(p, i) \
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do { \
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(p)[3] = ((i) >> 24) & 0xff; \
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(p)[2] = ((i) >> 16) & 0xff; \
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(p)[1] = ((i) >> 8) & 0xff; \
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(p)[0] = (i) & 0xff; \
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} while(0)
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/* Macro to make it easier to loop over several blocks. */
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#define FOR_BLOCKS(length, dst, src, blocksize) \
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assert( !((length) % (blocksize))); \
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for (; (length); ((length) -= (blocksize), \
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(dst) += (blocksize), \
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(src) += (blocksize)) )
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#endif /* NETTLE_MACROS_H_INCLUDED */
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