Use 'skip' when ignoring data in tar archives. This dramatically

increases performance when extracting a single entry from a large
uncompressed archive, especially on slow devices such as USB hard
drives.

Requires a number of changes:
   * New archive_read_open2() supports a 'skip' client function
   * Old archive_read_open() is implemented as a wrapper now, to
     continue supporting the old API/ABI.
   * _read_open_fd and _read_open_file sprout new 'skip' functions.
   * compression layer gets a new 'skip' operation.
   * compression_none passes skip requests through to client.
   * compression_{gzip,bzip2,compress} simply ignore skip requests.

Thanks to: Benjamin Lutz, who designed and implemented the whole thing.
   I'm just committing it.  ;-)

TODO: Need to update the documentation a little bit.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/libarchive/archive_read_support_compression_bzip2.c b/lib/libarchive/archive_read_support_compression_bzip2.c
index aa2d531..79742e8 100644
--- a/lib/libarchive/archive_read_support_compression_bzip2.c
+++ b/lib/libarchive/archive_read_support_compression_bzip2.c
@@ -187,6 +187,7 @@ init(struct archive *a, const void *buff, size_t n)
 
 	a->compression_read_ahead = read_ahead;
 	a->compression_read_consume = read_consume;
+	a->compression_skip = NULL; /* not supported */
 	a->compression_finish = finish;
 
 	/* Initialize compression library. */