libbb: use external gzip command as I/O layer

[oweals/opkg-lede.git] / libbb / gzip.h

diff --git a/libbb/gzip.h b/libbb/gzip.h
new file mode 100644 (file)
index 0000000..07e8e7a
--- /dev/null
+++ b/libbb/gzip.h
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (C) 2016 Jo-Philipp Wich <jo@mein.io>
+ *
+ *  Zlib decrompression utility routines.
+ *
+ *  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 <signal.h>
+#include <pthread.h>
+
+struct gzip_handle {
+       FILE *file;
+       struct gzip_handle *gzip;
+
+       pid_t pid;
+       int rfd, wfd;
+       struct sigaction pipe_sa;
+       pthread_t thread;
+};
+
+int gzip_exec(struct gzip_handle *zh, const char *filename);
+ssize_t gzip_read(struct gzip_handle *zh, char *buf, ssize_t len);
+ssize_t gzip_copy(struct gzip_handle *zh, FILE *out, ssize_t len);
+int gzip_close(struct gzip_handle *zh);
+FILE *gzip_fdopen(struct gzip_handle *zh, const char *filename);
+
+#define gzip_seek(zh, len) gzip_copy(zh, NULL, len)