squashfs_utils: Add host library and parsing from buffer
Allow the squashfs_utils library to be used on host and add a function to
parse the super block from a buffer.
Change-Id: I7cc59cba9882e159faeb0b203df20aaefb5c6e16
diff --git a/squashfs_utils/squashfs_utils.c b/squashfs_utils/squashfs_utils.c
index 6189189..1d619ce 100644
--- a/squashfs_utils/squashfs_utils.c
+++ b/squashfs_utils/squashfs_utils.c
@@ -25,9 +25,39 @@
#include "squashfs_fs.h"
+#ifdef SQUASHFS_NO_KLOG
+#include <stdio.h>
+#define ERROR(x...) fprintf(stderr, x)
+#else
#define ERROR(x...) KLOG_ERROR("squashfs_utils", x)
+#endif
-int squashfs_parse_sb(char *blk_device, struct squashfs_info *info) {
+size_t squashfs_get_sb_size()
+{
+ return sizeof(struct squashfs_super_block);
+}
+
+int squashfs_parse_sb_buffer(const void *buf, struct squashfs_info *info)
+{
+ const struct squashfs_super_block *sb =
+ (const struct squashfs_super_block *)buf;
+
+ if (sb->s_magic != SQUASHFS_MAGIC) {
+ return -1;
+ }
+
+ info->block_size = sb->block_size;
+ info->inodes = sb->inodes;
+ info->bytes_used = sb->bytes_used;
+ // by default mksquashfs pads the filesystem to 4K blocks
+ info->bytes_used_4K_padded =
+ sb->bytes_used + (4096 - (sb->bytes_used & (4096 - 1)));
+
+ return 0;
+}
+
+int squashfs_parse_sb(const char *blk_device, struct squashfs_info *info)
+{
int ret = 0;
struct squashfs_super_block sb;
int data_device;
@@ -44,19 +74,13 @@
ret = -1;
goto cleanup;
}
- if (sb.s_magic != SQUASHFS_MAGIC) {
+
+ if (squashfs_parse_sb_buffer(&sb, info) == -1) {
ERROR("Not a valid squashfs filesystem\n");
ret = -1;
goto cleanup;
}
- info->block_size = sb.block_size;
- info->inodes = sb.inodes;
- info->bytes_used = sb.bytes_used;
- // by default mksquashfs pads the filesystem to 4K blocks
- info->bytes_used_4K_padded =
- sb.bytes_used + (4096 - (sb.bytes_used & (4096 - 1)));
-
cleanup:
close(data_device);
return ret;