Abstract read and seek in unarchiving code, convert bunzip to file descriptors, support tar -j
diff --git a/archival/libunarchive/archive_xread.c b/archival/libunarchive/archive_xread.c
new file mode 100644
index 0000000..7fde4c0
--- /dev/null
+++ b/archival/libunarchive/archive_xread.c
@@ -0,0 +1,33 @@
+/*
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "unarchive.h"
+#include "libbb.h"
+
+extern ssize_t archive_xread(const archive_handle_t *archive_handle, unsigned char *buf, const size_t count)
+{
+ ssize_t size;
+
+ size = archive_handle->read(archive_handle->src_fd, buf, count);
+ if (size == -1) {
+ perror_msg_and_die("Read error");
+ }
+
+ return(size);
+}