summaryrefslogtreecommitdiff
path: root/e2fslib/ext_attr.c
diff options
context:
space:
mode:
Diffstat (limited to 'e2fslib/ext_attr.c')
-rw-r--r--e2fslib/ext_attr.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/e2fslib/ext_attr.c b/e2fslib/ext_attr.c
new file mode 100644
index 0000000..3a281e8
--- /dev/null
+++ b/e2fslib/ext_attr.c
@@ -0,0 +1,100 @@
+/*
+ * ext_attr.c --- extended attribute blocks
+ *
+ * Copyright (C) Andreas Gruenbacher, <a.gruenbacher@computer.org>
+ *
+ * %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 "ext2_ext_attr.h"
+
+#include "ext2fs.h"
+
+#ifdef EXT2FS_ENABLE_SWAPFS
+void ext2fs_swap_ext_attr(ext2_filsys fs, char *to, char *from)
+{
+ struct ext2_ext_attr_header *from_header =
+ (struct ext2_ext_attr_header *)from;
+ struct ext2_ext_attr_header *to_header =
+ (struct ext2_ext_attr_header *)to;
+ struct ext2_ext_attr_entry *from_entry, *to_entry;
+ char *from_end = (char *)from_header + fs->blocksize;
+ int n;
+
+ if (to_header != from_header)
+ memcpy(to_header, from_header, fs->blocksize);
+
+ to_header->h_magic = ext2fs_swab32(from_header->h_magic);
+ to_header->h_blocks = ext2fs_swab32(from_header->h_blocks);
+ to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
+ for (n=0; n<4; n++)
+ to_header->h_reserved[n] =
+ ext2fs_swab32(from_header->h_reserved[n]);
+
+ from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
+ to_entry = (struct ext2_ext_attr_entry *)(to_header+1);
+ while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
+ to_entry->e_value_offs =
+ ext2fs_swab16(from_entry->e_value_offs);
+ to_entry->e_value_block =
+ ext2fs_swab32(from_entry->e_value_block);
+ to_entry->e_value_size =
+ ext2fs_swab32(from_entry->e_value_size);
+ from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
+ to_entry = EXT2_EXT_ATTR_NEXT(to_entry);
+ }
+}
+#endif
+
+errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
+{
+ errcode_t retval;
+ struct ext2_ext_attr_entry *entry;
+
+ retval = io_channel_read_blk(fs->io, block, 1, buf);
+ if (retval)
+ return retval;
+#ifdef EXT2FS_ENABLE_SWAPFS
+ if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
+ EXT2_FLAG_SWAP_BYTES_READ)) != 0)
+ ext2fs_swap_ext_attr(fs, buf, buf);
+#endif
+ return 0;
+}
+
+errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
+{
+ errcode_t retval;
+ char *p, *end, *write_buf;
+ char *buf = NULL;
+ struct ext2_dir_entry *dirent;
+
+#ifdef EXT2FS_ENABLE_SWAPFS
+ if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
+ (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
+ retval = ext2fs_get_mem(fs->blocksize, (void **) &buf);
+ if (retval)
+ return retval;
+ write_buf = buf;
+ ext2fs_swap_ext_attr(fs, buf, inbuf);
+ } else
+#endif
+ write_buf = (char *) inbuf;
+ retval = io_channel_write_blk(fs->io, block, 1, write_buf);
+ if (buf)
+ ext2fs_free_mem((void **) &buf);
+ if (!retval)
+ ext2fs_mark_changed(fs);
+ return retval;
+}