/* * 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; #ifdef EXT2FS_ENABLE_SWAPFS unsigned int do_swap; #endif 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); }