decoder/flac: add class FlacStreamDecoder wrapping a FLAC__StreamDecoder*

src/decoder/plugins/FlacStreamDecoder.hxx

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2003-2016 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_FLAC_STREAM_DECODER
+#define MPD_FLAC_STREAM_DECODER
+
+#include "check.h"
+
+#include <FLAC/stream_decoder.h>
+
+#include <utility>
+
+#include <assert.h>
+
+/**
+ * OO wrapper for a FLAC__StreamDecoder.
+ */
+class FlacStreamDecoder {
+	FLAC__StreamDecoder *decoder;
+
+public:
+	FlacStreamDecoder()
+		:decoder(FLAC__stream_decoder_new()) {}
+
+	FlacStreamDecoder(FlacStreamDecoder &&src)
+		:decoder(src.decoder) {
+		src.decoder = nullptr;
+	}
+
+	~FlacStreamDecoder() {
+		if (decoder != nullptr)
+			FLAC__stream_decoder_delete(decoder);
+	}
+
+	FlacStreamDecoder &operator=(FlacStreamDecoder &&src) {
+		std::swap(decoder, src.decoder);
+		return *this;
+	}
+
+	operator bool() const {
+		return decoder != nullptr;
+	}
+
+	FLAC__StreamDecoder *get() {
+		assert(decoder != nullptr);
+
+		return decoder;
+	}
+};
+
+#endif