fs/io: move to io/

src/lib/zlib/AutoGunzipReader.hxx

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2003-2021 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_AUTO_GUNZIP_READER_HXX
+#define MPD_AUTO_GUNZIP_READER_HXX
+
+#include "io/PeekReader.hxx"
+
+#include <memory>
+
+class GunzipReader;
+
+/**
+ * A filter that detects gzip compression and optionally inserts a
+ * #GunzipReader.
+ */
+class AutoGunzipReader final : public Reader {
+	Reader *next = nullptr;
+	PeekReader peek;
+	std::unique_ptr<GunzipReader> gunzip;
+
+public:
+	explicit AutoGunzipReader(Reader &_next) noexcept;
+	~AutoGunzipReader() noexcept;
+
+	/* virtual methods from class Reader */
+	size_t Read(void *data, size_t size) override;
+
+private:
+	void Detect();
+};
+
+#endif