input/Reader: new Reader implementation wrapping InputStream

src/input/Reader.cxx

@@ -0,0 +1,38 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "Reader.hxx"
+#include "InputStream.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+
+size_t
+InputStreamReader::Read(void *data, size_t size)
+{
+	Error error;
+	size_t nbytes = is.LockRead(data, size, error);
+	assert(nbytes == 0 || !error.IsDefined());
+	assert(nbytes > 0 || error.IsDefined() || is.IsEOF());
+
+	if (gcc_unlikely(nbytes == 0 && error.IsDefined()))
+		LogError(error);
+
+	return nbytes;
+}