libtar: some minor cleanups

 - Use is_memory_zero from libutil
 - Move checksum update function to tar writer code
 - Move checksum verify function to tar reader code
 - Only export the function to compute the checksum

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

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/tar/src/write_header.c b/lib/tar/src/write_header.c
index b0711b3..5d98686 100644
--- a/lib/tar/src/write_header.c
+++ b/lib/tar/src/write_header.c
@@ -9,6 +9,13 @@
 #include "internal.h"
 #include <string.h>
 
+static void update_checksum(tar_header_t *hdr)
+{
+	sprintf(hdr->chksum, "%06o", tar_compute_checksum(hdr));
+	hdr->chksum[6] = '\0';
+	hdr->chksum[7] = ' ';
+}
+
 static void write_binary(char *dst, sqfs_u64 value, int digits)
 {
 	memset(dst, 0, digits);