1 files changed, 71 insertions, 0 deletions
diff --git a/src/decoder/DecoderBuffer.cxx b/src/decoder/DecoderBuffer.cxx
new file mode 100644
index 000000000..a8958d6fd
--- /dev/null
+++ b/src/decoder/DecoderBuffer.cxx
@@ -0,0 +1,71 @@
+/*
+ * 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 "DecoderBuffer.hxx"
+#include "DecoderAPI.hxx"
+
+#include <assert.h>
+
+bool
+DecoderBuffer::Fill()
+{
+	auto w = buffer.Write();
+	if (w.IsEmpty())
+		/* buffer is full */
+		return false;
+
+	size_t nbytes = decoder_read(decoder, is,
+				     w.data, w.size);
+	if (nbytes == 0)
+		/* end of file, I/O error or decoder command
+		   received */
+		return false;
+
+	buffer.Append(nbytes);
+	return true;
+}
+
+ConstBuffer<void>
+DecoderBuffer::Need(size_t min_size)
+{
+	while (true) {
+		const auto r = Read();
+		if (r.size >= min_size)
+			return r;
+
+		if (!Fill())
+			return nullptr;
+	}
+}
+
+bool
+DecoderBuffer::Skip(size_t nbytes)
+{
+	const auto r = buffer.Read();
+	if (r.size >= nbytes) {
+		buffer.Consume(nbytes);
+		return true;
+	}
+
+	buffer.Clear();
+	nbytes -= r.size;
+
+	return decoder_skip(decoder, is, nbytes);
+}