From: Stefani Seibold <stefani@seibold.net>
Date: Sat, 25 Jul 2009 00:02:22 +0000 (+0200)
Subject: unzip: try lseek before resorting to reading
X-Git-Tag: 1_15_0~41
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=f3b56b428f5c903ef4622d7e04925d9056f751e9;p=oweals%2Fbusybox.git

unzip: try lseek before resorting to reading

function                                             old     new   delta
unzip_skip                                            16      43     +27

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---

diff --git a/archival/unzip.c b/archival/unzip.c
index 7b47a8ab8..4201d1dd2 100644
--- a/archival/unzip.c
+++ b/archival/unzip.c
@@ -208,7 +208,8 @@ static uint32_t read_next_cds(int count_m1, uint32_t cds_offset, cds_header_t *c
 
 static void unzip_skip(off_t skip)
 {
-	bb_copyfd_exact_size(zip_fd, -1, skip);
+	if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
+		bb_copyfd_exact_size(zip_fd, -1, skip);
 }
 
 static void unzip_create_leading_dirs(const char *fn)