1 files changed, 106 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/rs_bitmap.c b/e2fsprogs/ext2fs/rs_bitmap.c
new file mode 100644
index 0000000..46653f0
--- /dev/null
+++ b/e2fsprogs/ext2fs/rs_bitmap.c
@@ -0,0 +1,106 @@
+/*
+ * rs_bitmap.c --- routine for changing the size of a bitmap
+ *
+ * Copyright (C) 1996, 1997 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end,
+				       ext2fs_generic_bitmap bmap)
+{
+	errcode_t	retval;
+	size_t		size, new_size;
+	__u32		bitno;
+
+	if (!bmap)
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP);
+
+	/*
+	 * If we're expanding the bitmap, make sure all of the new
+	 * parts of the bitmap are zero.
+	 */
+	if (new_end > bmap->end) {
+		bitno = bmap->real_end;
+		if (bitno > new_end)
+			bitno = new_end;
+		for (; bitno > bmap->end; bitno--)
+			ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap);
+	}
+	if (new_real_end == bmap->real_end) {
+		bmap->end = new_end;
+		return 0;
+	}
+	
+	size = ((bmap->real_end - bmap->start) / 8) + 1;
+	new_size = ((new_real_end - bmap->start) / 8) + 1;
+
+	if (size != new_size) {
+		retval = ext2fs_resize_mem(size, new_size, &bmap->bitmap);
+		if (retval)
+			return retval;
+	}
+	if (new_size > size)
+		memset(bmap->bitmap + size, 0, new_size - size);
+
+	bmap->end = new_end;
+	bmap->real_end = new_real_end;
+	return 0;
+}
+
+errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
+				     ext2fs_inode_bitmap bmap)
+{
+	errcode_t	retval;
+	
+	if (!bmap)
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP);
+
+	bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
+	retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
+					      bmap);
+	bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
+	return retval;
+}
+
+errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
+				     ext2fs_block_bitmap bmap)
+{
+	errcode_t	retval;
+	
+	if (!bmap)
+		return EXT2_ET_INVALID_ARGUMENT;
+
+	EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
+
+	bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
+	retval = ext2fs_resize_generic_bitmap(new_end, new_real_end,
+					      bmap);
+	bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
+	return retval;
+}
+