decrepit/macros.h

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.] */

#ifndef OPENSSL_HEADER_DECREPIT_MACROS_H
#define OPENSSL_HEADER_DECREPIT_MACROS_H

#include "../crypto/internal.h"


// NOTE - c is not incremented as per n2l
#define n2ln(c, l1, l2, n)                       \
  {                                              \
    c += n;                                      \
    l1 = l2 = 0;                                 \
    switch (n) {                                 \
      case 8:                                    \
        l2 = ((unsigned long)(*(--(c))));        \
	OPENSSL_FALLTHROUGH;                     \
      case 7:                                    \
        l2 |= ((unsigned long)(*(--(c)))) << 8;  \
	OPENSSL_FALLTHROUGH;                     \
      case 6:                                    \
        l2 |= ((unsigned long)(*(--(c)))) << 16; \
	OPENSSL_FALLTHROUGH;                     \
      case 5:                                    \
        l2 |= ((unsigned long)(*(--(c)))) << 24; \
	OPENSSL_FALLTHROUGH;                     \
      case 4:                                    \
        l1 = ((unsigned long)(*(--(c))));        \
	OPENSSL_FALLTHROUGH;                     \
      case 3:                                    \
        l1 |= ((unsigned long)(*(--(c)))) << 8;  \
	OPENSSL_FALLTHROUGH;                     \
      case 2:                                    \
        l1 |= ((unsigned long)(*(--(c)))) << 16; \
	OPENSSL_FALLTHROUGH;                     \
      case 1:                                    \
        l1 |= ((unsigned long)(*(--(c)))) << 24; \
    }                                            \
  }

// NOTE - c is not incremented as per l2n
#define l2nn(l1, l2, c, n)                               \
  {                                                      \
    c += n;                                              \
    switch (n) {                                         \
      case 8:                                            \
        *(--(c)) = (unsigned char)(((l2)) & 0xff);       \
	OPENSSL_FALLTHROUGH;                             \
      case 7:                                            \
        *(--(c)) = (unsigned char)(((l2) >> 8) & 0xff);  \
	OPENSSL_FALLTHROUGH;                             \
      case 6:                                            \
        *(--(c)) = (unsigned char)(((l2) >> 16) & 0xff); \
	OPENSSL_FALLTHROUGH;                             \
      case 5:                                            \
        *(--(c)) = (unsigned char)(((l2) >> 24) & 0xff); \
	OPENSSL_FALLTHROUGH;                             \
      case 4:                                            \
        *(--(c)) = (unsigned char)(((l1)) & 0xff);       \
	OPENSSL_FALLTHROUGH;                             \
      case 3:                                            \
        *(--(c)) = (unsigned char)(((l1) >> 8) & 0xff);  \
	OPENSSL_FALLTHROUGH;                             \
      case 2:                                            \
        *(--(c)) = (unsigned char)(((l1) >> 16) & 0xff); \
	OPENSSL_FALLTHROUGH;                             \
      case 1:                                            \
        *(--(c)) = (unsigned char)(((l1) >> 24) & 0xff); \
    }                                                    \
  }

#define l2n(l, c)                                   \
  (*((c)++) = (unsigned char)(((l) >> 24L) & 0xff), \
   *((c)++) = (unsigned char)(((l) >> 16L) & 0xff), \
   *((c)++) = (unsigned char)(((l) >> 8L) & 0xff),  \
   *((c)++) = (unsigned char)(((l)) & 0xff))

#define n2l(c, l)                           \
  (l = ((unsigned long)(*((c)++))) << 24L,  \
   l |= ((unsigned long)(*((c)++))) << 16L, \
   l |= ((unsigned long)(*((c)++))) << 8L,  \
   l |= ((unsigned long)(*((c)++))))


#endif  // OPENSSL_HEADER_DECREPIT_MACROS_H