diff options
Diffstat (limited to 'release/src/linux/linux/scripts/squashfs/read_fs.h')
-rw-r--r-- | release/src/linux/linux/scripts/squashfs/read_fs.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/release/src/linux/linux/scripts/squashfs/read_fs.h b/release/src/linux/linux/scripts/squashfs/read_fs.h new file mode 100644 index 00000000..fcc39c35 --- /dev/null +++ b/release/src/linux/linux/scripts/squashfs/read_fs.h @@ -0,0 +1,48 @@ +/* + * macros to convert each packed bitfield structure from little endian to big + * endian and vice versa. These are needed when creating a filesystem on a + * machine with different byte ordering to the target architecture. + * + * Copyright (c) 2002, 2003, 2004 Phillip Lougher <plougher@users.sourceforge.net> + * + * 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. + * + * mksquashfs.h + * + */ + +/* + * macros used to swap each structure entry, taking into account + * bitfields and different bitfield placing conventions on differing architectures + */ +#if __BYTE_ORDER == __BIG_ENDIAN + /* convert from big endian to little endian */ +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, tbits, b_pos) +#else + /* convert from little endian to big endian */ +#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, tbits, 64 - tbits - b_pos) +#endif + +#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\ + int bits;\ + int b_pos = pos % 8;\ + unsigned long long val = 0;\ + unsigned char *s = (unsigned char *)p + (pos / 8);\ + unsigned char *d = ((unsigned char *) &val) + 7;\ + for(bits = 0; bits < (tbits + b_pos); bits += 8) \ + *d-- = *s++;\ + value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\ +} +#define SQUASHFS_MEMSET(s, d, n) memset(s, 0, n); |