Abstract read and seek in unarchiving code, convert bunzip to file descriptors, support tar -j

1 files changed, 35 insertions, 0 deletions

diff --git a/archival/libunarchive/seek_by_jump.c b/archival/libunarchive/seek_by_jump.c
new file mode 100644
index 000000000..efad97fc4
--- /dev/null
+++ b/archival/libunarchive/seek_by_jump.c
@@ -0,0 +1,35 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "libbb.h"
+#include "unarchive.h"
+
+extern void seek_by_jump(const archive_handle_t *archive_handle, const unsigned int amount)
+{
+        if (lseek(archive_handle->src_fd, (off_t) amount, SEEK_CUR) == (off_t) -1) {
+#if CONFIG_FEATURE_UNARCHIVE_TAPE
+                if (errno == ESPIPE) {
+                        seek_by_char(archive_handle, amount);
+                } else
+#endif
+                        perror_msg_and_die("Seek failure");
+        }
+}