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macros.h

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    macros.h 6.35 KiB
    /* macros.h
     *
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001, 2010 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., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, USA.
     */
    
    #ifndef NETTLE_MACROS_H_INCLUDED
    #define NETTLE_MACROS_H_INCLUDED
    
    /* Reads a 64-bit integer, in network, big-endian, byte order */
    #define READ_UINT64(p)				\
    (  (((uint64_t) (p)[0]) << 56)			\
     | (((uint64_t) (p)[1]) << 48)			\
     | (((uint64_t) (p)[2]) << 40)			\
     | (((uint64_t) (p)[3]) << 32)			\
     | (((uint64_t) (p)[4]) << 24)			\
     | (((uint64_t) (p)[5]) << 16)			\
     | (((uint64_t) (p)[6]) << 8)			\
     |  ((uint64_t) (p)[7]))
    
    #define WRITE_UINT64(p, i)			\
    do {						\
      (p)[0] = ((i) >> 56) & 0xff;			\
      (p)[1] = ((i) >> 48) & 0xff;			\
      (p)[2] = ((i) >> 40) & 0xff;			\
      (p)[3] = ((i) >> 32) & 0xff;			\
      (p)[4] = ((i) >> 24) & 0xff;			\
      (p)[5] = ((i) >> 16) & 0xff;			\
      (p)[6] = ((i) >> 8) & 0xff;			\
      (p)[7] = (i) & 0xff;				\
    } while(0)
    
    /* 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]))