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dendian.c

/*
 * Copyright (C) 2001, 2002, and 2003  Roy Keene
 *
 * 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.
 *
 *      email: dact@rkeene.org
 */

#include "dact.h"
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "dendian.h"

int write_de(const int dst, const uint64_t num, const int sze) {
      unsigned char buf[8]={0};
      int i,x=0,v;

      for (i=0;i<sze;i++) {
            buf[sze-i-1]=((num&(0xff<<(i*8)))>>(i*8));
      }

      for (i=0;i<sze;i++) {
            if ((v=write(dst, &buf[i], 1))<=0) {
                  PERROR("write");
                  return(-1);
            }
            x+=v;
      }

      return(x);
}

int read_de(const int src, void *dest, const int sze, const int out_sze) {
      unsigned char ch;
      uint64_t ret=0;
      uint64_t tmpvar64;
      uint32_t tmpvar32;
      uint16_t tmpvar16;
      uint8_t tmpvar8;
      int i;

      for (i=0;i<sze;i++) {
            if (read(src, &ch, 1)<=0) {
                  PERROR("read");
                  return(-1);
            }
            ret|=((uint64_t) ch)<<(8*(sze-i-1));
      }
      switch (out_sze) {
            case 1: tmpvar8=ret; memcpy(dest, &tmpvar8, out_sze); break;
            case 2: tmpvar16=ret; memcpy(dest, &tmpvar16, out_sze); break;
            case 4: tmpvar32=ret; memcpy(dest, &tmpvar32, out_sze); break;
            case 8: tmpvar64=ret; memcpy(dest, &tmpvar64, out_sze); break;
      };

      return(sze);
}

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