50 lines
1.9 KiB
C
Executable File
50 lines
1.9 KiB
C
Executable File
/*
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* macros to convert each packed bitfield structure from little endian to big
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* endian and vice versa. These are needed when creating a filesystem on a
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* machine with different byte ordering to the target architecture.
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*
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* Copyright (c) 2002, 2003, 2004, 2005, 2006
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* Phillip Lougher <phillip@lougher.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* mksquashfs.h
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*
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*/
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/*
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* macros used to swap each structure entry, taking into account
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* bitfields and different bitfield placing conventions on differing architectures
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*/
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#if __BYTE_ORDER == __BIG_ENDIAN
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/* convert from big endian to little endian */
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#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, tbits, b_pos)
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#else
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/* convert from little endian to big endian */
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#define SQUASHFS_SWAP(value, p, pos, tbits) _SQUASHFS_SWAP(value, p, pos, tbits, 64 - tbits - b_pos)
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#endif
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#define _SQUASHFS_SWAP(value, p, pos, tbits, SHIFT) {\
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int bits;\
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int b_pos = pos % 8;\
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unsigned long long val = 0;\
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unsigned char *s = (unsigned char *)p + (pos / 8);\
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unsigned char *d = ((unsigned char *) &val) + 7;\
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for(bits = 0; bits < (tbits + b_pos); bits += 8) \
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*d-- = *s++;\
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value = (val >> (SHIFT))/* & ((1 << tbits) - 1)*/;\
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}
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#define SQUASHFS_MEMSET(s, d, n) memset(s, 0, n);
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