1 files changed, 212 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/bitmaps.c b/e2fsprogs/ext2fs/bitmaps.c
new file mode 100644
index 000000000..7edd28d7b
--- /dev/null
+++ b/e2fsprogs/ext2fs/bitmaps.c
@@ -0,0 +1,212 @@
+/*
+ * bitmaps.c --- routines to read, write, and manipulate the inode and
+ * block bitmaps.
+ *
+ * Copyright (C) 1993, 1994, 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>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <time.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+static errcode_t make_bitmap(__u32 start, __u32 end, __u32 real_end,
+                             const char *descr, char *init_map,
+                             ext2fs_generic_bitmap *ret)
+{
+        ext2fs_generic_bitmap   bitmap;
+        errcode_t               retval;
+        size_t                  size;
+
+        retval = ext2fs_get_mem(sizeof(struct ext2fs_struct_generic_bitmap), 
+                                &bitmap);
+        if (retval)
+                return retval;
+
+        bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
+        bitmap->fs = NULL;
+        bitmap->start = start;
+        bitmap->end = end;
+        bitmap->real_end = real_end;
+        bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
+        if (descr) {
+                retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
+                if (retval) {
+                        ext2fs_free_mem(&bitmap);
+                        return retval;
+                }
+                strcpy(bitmap->description, descr);
+        } else
+                bitmap->description = 0;
+
+        size = (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1);
+        retval = ext2fs_get_mem(size, &bitmap->bitmap);
+        if (retval) {
+                ext2fs_free_mem(&bitmap->description);
+                ext2fs_free_mem(&bitmap);
+                return retval;
+        }
+
+        if (init_map)
+                memcpy(bitmap->bitmap, init_map, size);
+        else
+                memset(bitmap->bitmap, 0, size);
+        *ret = bitmap;
+        return 0;
+}
+
+errcode_t ext2fs_allocate_generic_bitmap(__u32 start,
+                                         __u32 end,
+                                         __u32 real_end,
+                                         const char *descr,
+                                         ext2fs_generic_bitmap *ret)
+{
+        return make_bitmap(start, end, real_end, descr, 0, ret);
+}
+
+errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
+                             ext2fs_generic_bitmap *dest)
+{
+        errcode_t               retval;
+        ext2fs_generic_bitmap   new_map;
+
+        retval = make_bitmap(src->start, src->end, src->real_end,
+                             src->description, src->bitmap, &new_map);
+        if (retval)
+                return retval;
+        new_map->magic = src->magic;
+        new_map->fs = src->fs;
+        new_map->base_error_code = src->base_error_code;
+        *dest = new_map;
+        return 0;
+}
+
+void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
+{
+        __u32   i, j;
+
+        for (i=map->end+1, j = i - map->start; i <= map->real_end; i++, j++)
+                ext2fs_set_bit(j, map->bitmap);
+
+        return;
+}       
+
+errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
+                                       const char *descr,
+                                       ext2fs_inode_bitmap *ret)
+{
+        ext2fs_inode_bitmap bitmap;
+        errcode_t       retval;
+        __u32           start, end, real_end;
+
+        EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+        fs->write_bitmaps = ext2fs_write_bitmaps;
+
+        start = 1;
+        end = fs->super->s_inodes_count;
+        real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
+
+        retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
+                                                descr, &bitmap);
+        if (retval)
+                return retval;
+        
+        bitmap->magic = EXT2_ET_MAGIC_INODE_BITMAP;
+        bitmap->fs = fs;
+        bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
+        
+        *ret = bitmap;
+        return 0;
+}
+
+errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
+                                       const char *descr,
+                                       ext2fs_block_bitmap *ret)
+{
+        ext2fs_block_bitmap bitmap;
+        errcode_t       retval;
+        __u32           start, end, real_end;
+
+        EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+        fs->write_bitmaps = ext2fs_write_bitmaps;
+
+        start = fs->super->s_first_data_block;
+        end = fs->super->s_blocks_count-1;
+        real_end = (EXT2_BLOCKS_PER_GROUP(fs->super)  
+                    * fs->group_desc_count)-1 + start;
+        
+        retval = ext2fs_allocate_generic_bitmap(start, end, real_end,
+                                                descr, &bitmap);
+        if (retval)
+                return retval;
+
+        bitmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP;
+        bitmap->fs = fs;
+        bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
+        
+        *ret = bitmap;
+        return 0;
+}
+
+errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
+                                        ext2_ino_t end, ext2_ino_t *oend)
+{
+        EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_INODE_BITMAP);
+        
+        if (end > bitmap->real_end)
+                return EXT2_ET_FUDGE_INODE_BITMAP_END;
+        if (oend)
+                *oend = bitmap->end;
+        bitmap->end = end;
+        return 0;
+}
+
+errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
+                                        blk_t end, blk_t *oend)
+{
+        EXT2_CHECK_MAGIC(bitmap, EXT2_ET_MAGIC_BLOCK_BITMAP);
+        
+        if (end > bitmap->real_end)
+                return EXT2_ET_FUDGE_BLOCK_BITMAP_END;
+        if (oend)
+                *oend = bitmap->end;
+        bitmap->end = end;
+        return 0;
+}
+
+void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
+{
+        if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
+                return;
+
+        memset(bitmap->bitmap, 0,
+               (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
+}
+
+void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
+{
+        if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
+                return;
+
+        memset(bitmap->bitmap, 0,
+               (size_t) (((bitmap->real_end - bitmap->start) / 8) + 1));
+}