pcm_buffer: convert to C++

src/pcm/PcmBuffer.hxx

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2003-2013 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 PCM_BUFFER_HXX
+#define PCM_BUFFER_HXX
+
+#include "check.h"
+#include "gcc.h"
+
+#include <glib.h>
+
+#include <assert.h>
+
+/**
+ * Manager for a temporary buffer which grows as needed.  We could
+ * allocate a new buffer every time pcm_convert() is called, but that
+ * would put too much stress on the allocator.
+ */
+struct PcmBuffer {
+	void *buffer;
+
+	size_t size;
+
+	PcmBuffer():buffer(nullptr), size(0) {}
+
+	~PcmBuffer() {
+		g_free(buffer);
+	}
+
+	void Clear() {
+		g_free(buffer);
+		buffer = nullptr;
+	}
+
+	/**
+	 * Get the buffer, and guarantee a minimum size.  This buffer becomes
+	 * invalid with the next pcm_buffer_get() call.
+	 *
+	 * This function will never return NULL, even if size is zero, because
+	 * the PCM library uses the NULL return value to signal "error".  An
+	 * empty destination buffer is not always an error.
+	 */
+	gcc_malloc
+	void *Get(size_t size);
+};
+
+#endif