import ext2fs lib to prep for new e2fsprogs

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);
+}
+