Add support for unpacking sparse files as sparse files

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/data_reader.h b/include/data_reader.h
index 68788b4..7de8e1a 100644
--- a/include/data_reader.h
+++ b/include/data_reader.h
@@ -26,8 +26,12 @@ void data_reader_destroy(data_reader_t *data);
   file and its fragment, if it has one. The entire data is dumped to the
   given file descriptor.
 
+  If allow_sparse is true, try to truncate and seek forward on outfd if a
+  zero block is found. If false, always write blocks of zeros to outfd.
+
   Returns 0 on success, prints error messages to stderr on failure.
  */
-int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd);
+int data_reader_dump_file(data_reader_t *data, file_info_t *fi, int outfd,
+			  bool allow_sparse);
 
 #endif /* DATA_READER_H */