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authorMike Frysinger2005-05-09 22:10:42 +0000
committerMike Frysinger2005-05-09 22:10:42 +0000
commit1fd98e039d146dcff02a5350f509cabca65fd29c (patch)
tree1564707d41a6271bb44cf3fa5b88b9cc70fedd35 /e2fsprogs/ext2fs/dirblock.c
parentb32011943a0764872ca1ea17f13b53176ace8e69 (diff)
downloadbusybox-1fd98e039d146dcff02a5350f509cabca65fd29c.zip
busybox-1fd98e039d146dcff02a5350f509cabca65fd29c.tar.gz
import ext2fs lib to prep for new e2fsprogs
Diffstat (limited to 'e2fsprogs/ext2fs/dirblock.c')
-rw-r--r--e2fsprogs/ext2fs/dirblock.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/dirblock.c b/e2fsprogs/ext2fs/dirblock.c
new file mode 100644
index 0000000..ebfc72c
--- /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);
+}
+