input/GunzipInputStream: new class

test/run_gunzip.cxx

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "fs/io/GunzipReader.hxx"
+#include "fs/io/FileReader.hxx"
+#include "fs/io/StdioOutputStream.hxx"
+#include "util/Error.hxx"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static bool
+Copy(OutputStream &dest, Reader &src, Error &error)
+{
+	while (true) {
+		char buffer[4096];
+		size_t nbytes = src.Read(buffer, sizeof(buffer), error);
+		if (nbytes == 0)
+			return !error.IsDefined();
+
+		if (!dest.Write(buffer, nbytes, error))
+			return false;
+	}
+}
+
+static bool
+CopyGunzip(OutputStream &dest, Reader &_src, Error &error)
+{
+	GunzipReader src(_src, error);
+	return src.IsDefined() && Copy(dest, src, error);
+}
+
+static bool
+CopyGunzip(FILE *_dest, Path src_path, Error &error)
+{
+	StdioOutputStream dest(_dest);
+	FileReader src(src_path, error);
+	return src.IsDefined() && CopyGunzip(dest, src, error);
+}
+
+int
+main(int argc, gcc_unused char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: run_gunzip PATH\n");
+		return EXIT_FAILURE;
+	}
+
+	Path path = Path::FromFS(argv[1]);
+
+	Error error;
+	if (!CopyGunzip(stdout, path, error)) {
+		fprintf(stderr, "%s\n", error.GetMessage());
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}