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/*
* Copyright (c) 2009, 2010, 2021
* Phillip Lougher <phillip@squashfs.org.uk>
*
* 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,
* 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* swap.c
*/
#include "endian_compat.h"
#if __BYTE_ORDER == __BIG_ENDIAN
void swap_le16(void *src, void *dest)
{
unsigned char *s = src;
unsigned char *d = dest;
d[0] = s[1];
d[1] = s[0];
}
void swap_le32(void *src, void *dest)
{
unsigned char *s = src;
unsigned char *d = dest;
d[0] = s[3];
d[1] = s[2];
d[2] = s[1];
d[3] = s[0];
}
void swap_le64(void *src, void *dest)
{
unsigned char *s = src;
unsigned char *d = dest;
d[0] = s[7];
d[1] = s[6];
d[2] = s[5];
d[3] = s[4];
d[4] = s[3];
d[5] = s[2];
d[6] = s[1];
d[7] = s[0];
}
unsigned short inswap_le16(unsigned short num)
{
return (num >> 8) |
((num & 0xff) << 8);
}
unsigned int inswap_le32(unsigned int num)
{
return (num >> 24) |
((num & 0xff0000) >> 8) |
((num & 0xff00) << 8) |
((num & 0xff) << 24);
}
long long inswap_le64(long long n)
{
unsigned long long num = n;
return (num >> 56) |
((num & 0xff000000000000LL) >> 40) |
((num & 0xff0000000000LL) >> 24) |
((num & 0xff00000000LL) >> 8) |
((num & 0xff000000) << 8) |
((num & 0xff0000) << 24) |
((num & 0xff00) << 40) |
((num & 0xff) << 56);
}
#define SWAP_LE_NUM(BITS) \
void swap_le##BITS##_num(void *s, void *d, int n) \
{\
int i;\
for(i = 0; i < n; i++, s += BITS / 8, d += BITS / 8)\
swap_le##BITS(s, d);\
}
SWAP_LE_NUM(16)
SWAP_LE_NUM(32)
SWAP_LE_NUM(64)
#define INSWAP_LE_NUM(BITS, TYPE) \
void inswap_le##BITS##_num(TYPE *s, int n) \
{\
int i;\
for(i = 0; i < n; i++)\
s[i] = inswap_le##BITS(s[i]);\
}
INSWAP_LE_NUM(16, unsigned short)
INSWAP_LE_NUM(32, unsigned int)
INSWAP_LE_NUM(64, long long)
#endif
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