/*
* 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.
+ * 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>
#if HAVE_UNISTD_H
#include <unistd.h>
#include <string.h>
#include <time.h>
-#if EXT2_FLAT_INCLUDES
#include "ext2_fs.h"
-#else
-#include <linux/ext2_fs.h>
-#endif
-
#include "ext2fs.h"
-errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
- void *buf)
+errcode_t ext2fs_read_dir_block3(ext2_filsys fs, blk64_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;
+
- retval = io_channel_read_blk(fs->io, block, 1, buf);
+ retval = io_channel_read_blk64(fs->io, block, 1, buf);
if (retval)
return retval;
- if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
- EXT2_FLAG_SWAP_BYTES_READ)) == 0)
- return 0;
+
p = (char *) buf;
end = (char *) buf + fs->blocksize;
- while (p < end) {
+ while (p < end-8) {
dirent = (struct ext2_dir_entry *) p;
+#ifdef WORDS_BIGENDIAN
dirent->inode = ext2fs_swab32(dirent->inode);
dirent->rec_len = ext2fs_swab16(dirent->rec_len);
dirent->name_len = ext2fs_swab16(dirent->name_len);
- p += (dirent->rec_len < 8) ? 8 : dirent->rec_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
+ if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
+ return retval;
+ if ((rec_len < 8) || (rec_len % 4)) {
+ rec_len = 8;
+ retval = EXT2_ET_DIR_CORRUPTED;
+ } else if (((name_len & 0xFF) + 8) > rec_len)
+ retval = EXT2_ET_DIR_CORRUPTED;
+ p += rec_len;
}
- return 0;
+ return retval;
}
-errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
- void *inbuf)
+/*
+ * Compute the total directory entry data length.
+ * This includes the filename and an implicit NUL terminator (always present),
+ * and optional extensions. Each extension has a bit set in the high 4 bits of
+ * de->file_type, and the extension length is the first byte in each entry.
+ */
+int ext2_get_dirent_dirdata_size(struct ext2_dir_entry_2 *de,
+ char dirdata_flags)
+{
+ char *len = de->name + de->name_len + 1 /* NUL terminator */;
+ int dlen = 0;
+ __u8 extra_data_flags = (de->file_type & ~EXT2_FT_MASK) >> 4;
+
+ dirdata_flags >>= 4;
+ while ((extra_data_flags & dirdata_flags) != 0) {
+ if (extra_data_flags & 1) {
+ if (dirdata_flags & 1)
+ dlen += *len;
+
+ len += *len;
+ }
+ extra_data_flags >>= 1;
+ dirdata_flags >>= 1;
+ }
+
+ /* add NUL terminator byte to dirdata length */
+ return dlen + (dlen != 0);
+}
+
+int ext2_get_dirent_size(struct ext2_dir_entry_2 *de)
{
+ return ext2_get_dirent_dirdata_size(de, ~EXT2_FT_MASK);
+}
+
+errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block,
+ void *buf, int flags EXT2FS_ATTR((unused)))
+{
+ return ext2fs_read_dir_block3(fs, block, buf, flags);
+}
+
+errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
+ void *buf)
+{
+ return ext2fs_read_dir_block3(fs, block, buf, 0);
+}
+
+
+errcode_t ext2fs_write_dir_block3(ext2_filsys fs, blk64_t block,
+ void *inbuf, int flags EXT2FS_ATTR((unused)))
+{
+#ifdef WORDS_BIGENDIAN
errcode_t retval;
- char *p, *end, *write_buf;
+ char *p, *end;
char *buf = 0;
+ unsigned int rec_len;
struct ext2_dir_entry *dirent;
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
- retval = ext2fs_get_mem(fs->blocksize, (void **) &buf);
- if (retval)
+ 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 ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0)
return retval;
- write_buf = buf;
- memcpy(buf, inbuf, fs->blocksize);
- p = buf;
- end = buf + fs->blocksize;
- while (p < end) {
- dirent = (struct ext2_dir_entry *) p;
- p += (dirent->rec_len < 8) ? 8 : dirent->rec_len;
- dirent->inode = ext2fs_swab32(dirent->inode);
- dirent->rec_len = ext2fs_swab16(dirent->rec_len);
- dirent->name_len = ext2fs_swab16(dirent->name_len);
+ if ((rec_len < 8) ||
+ (rec_len % 4)) {
+ ext2fs_free_mem(&buf);
+ return (EXT2_ET_DIR_CORRUPTED);
}
- } else
- write_buf = (char *) inbuf;
- retval = io_channel_write_blk(fs->io, block, 1, write_buf);
- if (buf)
- ext2fs_free_mem((void **) &buf);
+ p += rec_len;
+ dirent->inode = ext2fs_swab32(dirent->inode);
+ dirent->rec_len = ext2fs_swab16(dirent->rec_len);
+ dirent->name_len = ext2fs_swab16(dirent->name_len);
+
+ if (flags & EXT2_DIRBLOCK_V2_STRUCT)
+ dirent->name_len = ext2fs_swab16(dirent->name_len);
+ }
+ retval = io_channel_write_blk64(fs->io, block, 1, buf);
+ ext2fs_free_mem(&buf);
return retval;
+#else
+ return io_channel_write_blk64(fs->io, block, 1, (char *) inbuf);
+#endif
}
+errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
+ void *inbuf, int flags EXT2FS_ATTR((unused)))
+{
+ return ext2fs_write_dir_block3(fs, block, inbuf, flags);
+}
+
+errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
+ void *inbuf)
+{
+ return ext2fs_write_dir_block3(fs, block, inbuf, 0);
+}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff