diff options
Diffstat (limited to 'lib/ext2fs/ind_block.c')
| -rw-r--r-- | lib/ext2fs/ind_block.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/lib/ext2fs/ind_block.c b/lib/ext2fs/ind_block.c new file mode 100644 index 0000000..aa82ae6 --- /dev/null +++ b/lib/ext2fs/ind_block.c @@ -0,0 +1,67 @@ +/* + * ind_block.c --- indirect block I/O routines + * + * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, + * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Library + * General Public License, version 2. + * %End-Header% + */ + +#include "config.h" +#include <stdio.h> +#include <string.h> +#if HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include "ext2_fs.h" +#include "ext2fs.h" + +errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf) +{ + errcode_t retval; +#ifdef WORDS_BIGENDIAN + blk_t *block_nr; + int i; + int limit = fs->blocksize >> 2; +#endif + + if ((fs->flags & EXT2_FLAG_IMAGE_FILE) && + (fs->io != fs->image_io)) + memset(buf, 0, fs->blocksize); + else { + retval = io_channel_read_blk(fs->io, blk, 1, buf); + if (retval) + return retval; + } +#ifdef WORDS_BIGENDIAN + block_nr = (blk_t *) buf; + for (i = 0; i < limit; i++, block_nr++) + *block_nr = ext2fs_swab32(*block_nr); +#endif + return 0; +} + +errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf) +{ +#ifdef WORDS_BIGENDIAN + blk_t *block_nr; + int i; + int limit = fs->blocksize >> 2; +#endif + + if (fs->flags & EXT2_FLAG_IMAGE_FILE) + return 0; + +#ifdef WORDS_BIGENDIAN + block_nr = (blk_t *) buf; + for (i = 0; i < limit; i++, block_nr++) + *block_nr = ext2fs_swab32(*block_nr); +#endif + return io_channel_write_blk(fs->io, blk, 1, buf); +} + + |