Extract OS component when using older ipsw archives

Older ipsw archives have the root filesystem stored in compressed
format rather than just "stored". The "Verifying Filesystem" step
would then fail as compressed files are not seekable in ZIP files.
This commit introduces a detection for this and has the filesystem
extracted should it be required.
If not using a cache path, the temp file used for extraction will
be deleted after the procedure is completed.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/ipsw.h b/src/ipsw.h
index 96bcb62..56faf94 100644
--- a/src/ipsw.h
+++ b/src/ipsw.h
@@ -49,12 +49,15 @@ typedef int (*ipsw_send_cb)(void *ctx, void *data, size_t size);
 struct ipsw_file_handle {
 	FILE* file;
 	struct zip_file* zfile;
+	uint64_t size;
+	int seekable;
 };
 typedef struct ipsw_file_handle* ipsw_file_handle_t;
 
 ipsw_file_handle_t ipsw_file_open(ipsw_archive_t, const char* path);
 void ipsw_file_close(ipsw_file_handle_t handle);
 
+uint64_t ipsw_file_size(ipsw_file_handle_t handle);
 int64_t ipsw_file_read(ipsw_file_handle_t handle, void* buffer, size_t size);
 int ipsw_file_seek(ipsw_file_handle_t handle, int64_t offset, int whence);
 int64_t ipsw_file_tell(ipsw_file_handle_t handle);