diff options
Diffstat (limited to 'squashfs-tools/swap.c')
-rw-r--r-- | squashfs-tools/swap.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/squashfs-tools/swap.c b/squashfs-tools/swap.c new file mode 100644 index 0000000..eb0f326 --- /dev/null +++ b/squashfs-tools/swap.c @@ -0,0 +1,117 @@ +/* + * 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 |