add libarchive compatability object

This allows us to support both libarchive 2.8.x as well as 3.x without
deprecation warnings on compile.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

lib/libalpm/Makefile.am

@@ -44,6 +44,7 @@ libalpm_la_SOURCES = \
 	graph.h graph.c \
 	group.h group.c \
 	handle.h handle.c \
+	libarchive-compat.h libarchive-compat.c \
 	log.h log.c \
 	package.h package.c \
 	pkghash.h pkghash.c \

lib/libalpm/libarchive-compat.c

@@ -0,0 +1,65 @@
+/*
+ * libarchive-compat.c
+ *
+ *  Copyright (c) 2013 Pacman Development Team <pacman-dev@archlinux.org>
+ *
+ *  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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+
+#include "libarchive-compat.h"
+
+int _alpm_archive_read_free(struct archive *archive) {
+#if ARCHIVE_VERSION_NUMBER >= 3000000
+	return archive_read_free(archive);
+#else
+	return archive_read_finish(archive);
+#endif
+}
+
+int64_t _alpm_archive_compressed_ftell(struct archive *archive) {
+#if ARCHIVE_VERSION_NUMBER >= 3000000
+	return archive_filter_bytes(archive, -1);
+#else
+	return archive_position_compressed(archive);
+#endif
+}
+
+int _alpm_archive_read_open_file(struct archive *archive,
+		const char *filename, size_t block_size) {
+#if ARCHIVE_VERSION_NUMBER >= 3000000
+	return archive_read_open_filename(archive, filename, block_size);
+#else
+	return archive_read_open_file(archive, filename, block_size);
+#endif
+}
+
+int _alpm_archive_filter_code(struct archive *archive) {
+#if ARCHIVE_VERSION_NUMBER >= 3000000
+	return archive_filter_code(archive, 0);
+#else
+	return archive_compression(archive);
+#endif
+}
+
+int _alpm_archive_read_support_filter_all(struct archive *archive) {
+#if ARCHIVE_VERSION_NUMBER >= 3000000
+	return archive_read_support_filter_all(archive);
+#else
+	return archive_read_support_compression_all(archive);
+#endif
+}
+
+/* vim: set ts=2 sw=2 noet: */

lib/libalpm/libarchive-compat.h

@@ -0,0 +1,33 @@
+/*
+ * libarchive-compat.h
+ *
+ *  Copyright (c) 2013 Pacman Development Team <pacman-dev@archlinux.org>
+ *
+ *  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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _LIBARCHIVE_H
+#define _LIBARCHIVE_H
+
+#include <archive.h>
+
+int _alpm_archive_read_free(struct archive *archive);
+int64_t _alpm_archive_compressed_ftell(struct archive *archive);
+int _alpm_archive_read_open_file(struct archive *archive,
+		const char *filename, size_t block_size);
+int _alpm_archive_filter_code(struct archive *archive);
+int _alpm_archive_read_support_filter_all(struct archive *archive);
+
+#endif /* _LIBARCHIVE_H */
+
+/* vim: set ts=2 sw=2 noet: */