diff options
Diffstat (limited to 'e2fsprogs/ext2fs/dirblock.c')
| -rw-r--r-- | e2fsprogs/ext2fs/dirblock.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/dirblock.c b/e2fsprogs/ext2fs/dirblock.c new file mode 100644 index 000000000..ebfc72c5f --- /dev/null +++ b/e2fsprogs/ext2fs/dirblock.c @@ -0,0 +1,130 @@ +/* + * dirblock.c --- directory block routines. + * + * Copyright (C) 1995, 1996 Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ + +#include <stdio.h> +#if HAVE_UNISTD_H +#include <unistd.h> +#endif +#include <string.h> +#include <time.h> + +#include "ext2_fs.h" +#include "ext2fs.h" + +errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block, + void *buf, int flags EXT2FS_ATTR((unused))) +{ + errcode_t retval; + char *p, *end; + struct ext2_dir_entry *dirent; + unsigned int name_len, rec_len, do_swap; + + + retval = io_channel_read_blk(fs->io, block, 1, buf); + if (retval) + return retval; +#ifdef EXT2FS_ENABLE_SWAPFS + do_swap = (fs->flags & (EXT2_FLAG_SWAP_BYTES| + EXT2_FLAG_SWAP_BYTES_READ)) != 0; +#endif + p = (char *) buf; + end = (char *) buf + fs->blocksize; + while (p < end-8) { + dirent = (struct ext2_dir_entry *) p; +#ifdef EXT2FS_ENABLE_SWAPFS + if (do_swap) { + dirent->inode = ext2fs_swab32(dirent->inode); + dirent->rec_len = ext2fs_swab16(dirent->rec_len); + dirent->name_len = ext2fs_swab16(dirent->name_len); + } +#endif + name_len = dirent->name_len; +#ifdef WORDS_BIGENDIAN + if (flags & EXT2_DIRBLOCK_V2_STRUCT) + dirent->name_len = ext2fs_swab16(dirent->name_len); +#endif + rec_len = dirent->rec_len; + if ((rec_len < 8) || (rec_len % 4)) { + rec_len = 8; + retval = EXT2_ET_DIR_CORRUPTED; + } + if (((name_len & 0xFF) + 8) > dirent->rec_len) + retval = EXT2_ET_DIR_CORRUPTED; + p += rec_len; + } + return retval; +} + +errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block, + void *buf) +{ + return ext2fs_read_dir_block2(fs, block, buf, 0); +} + + +errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block, + void *inbuf, int flags EXT2FS_ATTR((unused))) +{ +#ifdef EXT2FS_ENABLE_SWAPFS + int do_swap = 0; + errcode_t retval; + char *p, *end; + char *buf = 0; + struct ext2_dir_entry *dirent; + + if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || + (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) + do_swap = 1; + +#ifndef WORDS_BIGENDIAN + if (!do_swap) + return io_channel_write_blk(fs->io, block, 1, (char *) inbuf); +#endif + + retval = ext2fs_get_mem(fs->blocksize, &buf); + if (retval) + return retval; + memcpy(buf, inbuf, fs->blocksize); + p = buf; + end = buf + fs->blocksize; + while (p < end) { + dirent = (struct ext2_dir_entry *) p; + if ((dirent->rec_len < 8) || + (dirent->rec_len % 4)) { + ext2fs_free_mem(&buf); + return (EXT2_ET_DIR_CORRUPTED); + } + p += dirent->rec_len; + if (do_swap) { + dirent->inode = ext2fs_swab32(dirent->inode); + dirent->rec_len = ext2fs_swab16(dirent->rec_len); + dirent->name_len = ext2fs_swab16(dirent->name_len); + } +#ifdef WORDS_BIGENDIAN + if (flags & EXT2_DIRBLOCK_V2_STRUCT) + dirent->name_len = ext2fs_swab16(dirent->name_len); +#endif + } + retval = io_channel_write_blk(fs->io, block, 1, buf); + ext2fs_free_mem(&buf); + return retval; +#else + return io_channel_write_blk(fs->io, block, 1, (char *) inbuf); +#endif +} + + +errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block, + void *inbuf) +{ + return ext2fs_write_dir_block2(fs, block, inbuf, 0); +} + |