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+/*
+ * 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.
+ */
+
+#ifndef MPD_GZIP_OUTPUT_STREAM_HXX
+#define MPD_GZIP_OUTPUT_STREAM_HXX
+
+#include "check.h"
+#include "OutputStream.hxx"
+#include "Compiler.h"
+
+#include <assert.h>
+#include <zlib.h>
+
+class Error;
+class Domain;
+
+/**
+ * A filter that compresses data written to it using zlib, forwarding
+ * compressed data in the "gzip" format.
+ *
+ * Don't forget to call Flush() before destructing this object.
+ */
+class GzipOutputStream final : public OutputStream {
+ OutputStream &next;
+
+ z_stream z;
+
+public:
+ /**
+ * Construct the filter. Call IsDefined() to check whether
+ * the constructor has succeeded. If not, #error will hold
+ * information about the failure.
+ */
+ GzipOutputStream(OutputStream &_next, Error &error);
+ ~GzipOutputStream();
+
+ /**
+ * Check whether the constructor has succeeded.
+ */
+ bool IsDefined() const {
+ return z.opaque == nullptr;
+ }
+
+ /**
+ * Finish the file and write all data remaining in zlib's
+ * output buffer.
+ */
+ bool Flush(Error &error);
+
+ /* virtual methods from class OutputStream */
+ bool Write(const void *data, size_t size, Error &error) override;
+};
+
+#endif