mirror of https://github.com/ventoy/Ventoy
124 lines
2.4 KiB
C
124 lines
2.4 KiB
C
/*
|
|
* Copyright (c) 2009, 2010
|
|
* 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
|
|
*/
|
|
|
|
#ifndef linux
|
|
#define __BYTE_ORDER BYTE_ORDER
|
|
#define __BIG_ENDIAN BIG_ENDIAN
|
|
#define __LITTLE_ENDIAN LITTLE_ENDIAN
|
|
#else
|
|
#include <endian.h>
|
|
#endif
|
|
|
|
#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
|