fs/io/BufferedReader: new class to replace class TextFile

The new class is pluggable, to prepare for gzipped database files.

For now, the TextFile class remains, and will be refactored away
later.

1 files changed, 75 insertions, 0 deletions

diff --git a/src/fs/io/BufferedReader.hxx b/src/fs/io/BufferedReader.hxx
new file mode 100644
index 000000000..61cc8df83
--- /dev/null
+++ b/src/fs/io/BufferedReader.hxx
@@ -0,0 +1,75 @@
+/*
+ * 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_BUFFERED_READER_HXX
+#define MPD_BUFFERED_READER_HXX
+
+#include "check.h"
+#include "Compiler.h"
+#include "util/DynamicFifoBuffer.hxx"
+#include "util/Error.hxx"
+
+#include <stddef.h>
+
+class Reader;
+class Error;
+
+class BufferedReader {
+	static constexpr size_t MAX_SIZE = 512 * 1024;
+
+	Reader &reader;
+
+	DynamicFifoBuffer<char> buffer;
+
+	Error last_error;
+
+	bool eof;
+
+public:
+	BufferedReader(Reader &_reader)
+		:reader(_reader), buffer(4096), eof(false) {}
+
+	gcc_pure
+	bool Check() const {
+		return !last_error.IsDefined();
+	}
+
+	bool Check(Error &error) const {
+		if (last_error.IsDefined()) {
+			error.Set(last_error);
+			return false;
+		} else
+			return true;
+	}
+
+	bool Fill(bool need_more);
+
+	gcc_pure
+	WritableBuffer<void> Read() const {
+		return buffer.Read().ToVoid();
+	}
+
+	void Consume(size_t n) {
+		buffer.Consume(n);
+	}
+
+	char *ReadLine();
+};
+
+#endif