21 files changed, 1593 insertions, 0 deletions
diff --git a/src/fs/io/AutoGunzipReader.cxx b/src/fs/io/AutoGunzipReader.cxx
new file mode 100644
index 000000000..2552f7b99
--- /dev/null
+++ b/src/fs/io/AutoGunzipReader.cxx
@@ -0,0 +1,70 @@
+/*
+ * 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 "AutoGunzipReader.hxx"
+#include "GunzipReader.hxx"
+#include "util/Error.hxx"
+
+AutoGunzipReader::~AutoGunzipReader()
+{
+	delete gunzip;
+}
+
+gcc_pure
+static bool
+IsGzip(const uint8_t data[4])
+{
+	return data[0] == 0x1f && data[1] == 0x8b && data[2] == 0x08 &&
+		(data[3] & 0xe0) == 0;
+}
+
+inline bool
+AutoGunzipReader::Detect(Error &error)
+{
+	const uint8_t *data = (const uint8_t *)peek.Peek(4, error);
+	if (data == nullptr) {
+		if (error.IsDefined())
+			return false;
+
+		next = &peek;
+		return true;
+	}
+
+	if (IsGzip(data)) {
+		gunzip = new GunzipReader(peek, error);
+		if (!gunzip->IsDefined())
+			return false;
+
+
+		next = gunzip;
+	} else
+		next = &peek;
+
+	return true;
+}
+
+size_t
+AutoGunzipReader::Read(void *data, size_t size, Error &error)
+{
+	if (next == nullptr && !Detect(error))
+		return false;
+
+	return next->Read(data, size, error);
+}
diff --git a/src/fs/io/AutoGunzipReader.hxx b/src/fs/io/AutoGunzipReader.hxx
new file mode 100644
index 000000000..0efd9d56c
--- /dev/null
+++ b/src/fs/io/AutoGunzipReader.hxx
@@ -0,0 +1,51 @@
+/*
+ * 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_AUTO_GUNZIP_READER_HXX
+#define MPD_AUTO_GUNZIP_READER_HXX
+
+#include "check.h"
+#include "PeekReader.hxx"
+
+#include <stdint.h>
+
+class GunzipReader;
+
+/**
+ * A filter that detects gzip compression and optionally inserts a
+ * #GunzipReader.
+ */
+class AutoGunzipReader final : public Reader {
+	Reader *next;
+	PeekReader peek;
+	GunzipReader *gunzip;
+
+public:
+	AutoGunzipReader(Reader &_next)
+		:next(nullptr), peek(_next), gunzip(nullptr) {}
+	~AutoGunzipReader();
+
+	/* virtual methods from class Reader */
+	virtual size_t Read(void *data, size_t size, Error &error) override;
+
+private:
+	bool Detect(Error &error);
+};
+
+#endif
diff --git a/src/fs/io/BufferedOutputStream.cxx b/src/fs/io/BufferedOutputStream.cxx
new file mode 100644
index 000000000..088a3e279
--- /dev/null
+++ b/src/fs/io/BufferedOutputStream.cxx
@@ -0,0 +1,143 @@
+/*
+ * 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 "BufferedOutputStream.hxx"
+#include "OutputStream.hxx"
+
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+
+bool
+BufferedOutputStream::AppendToBuffer(const void *data, size_t size)
+{
+	auto r = buffer.Write();
+	if (r.size < size)
+		return false;
+
+	memcpy(r.data, data, size);
+	buffer.Append(size);
+	return true;
+}
+
+bool
+BufferedOutputStream::Write(const void *data, size_t size)
+{
+	if (gcc_unlikely(last_error.IsDefined()))
+		return false;
+
+	if (AppendToBuffer(data, size))
+		return true;
+
+	if (!Flush())
+		return false;
+
+	if (AppendToBuffer(data, size))
+		return true;
+
+	return os.Write(data, size, last_error);
+}
+
+bool
+BufferedOutputStream::Write(const char *p)
+{
+	return Write(p, strlen(p));
+}
+
+bool
+BufferedOutputStream::Format(const char *fmt, ...)
+{
+	if (gcc_unlikely(last_error.IsDefined()))
+		return false;
+
+	auto r = buffer.Write();
+	if (r.IsEmpty()) {
+		if (!Flush())
+			return false;
+
+		r = buffer.Write();
+	}
+
+	/* format into the buffer */
+	va_list ap;
+	va_start(ap, fmt);
+	size_t size = vsnprintf(r.data, r.size, fmt, ap);
+	va_end(ap);
+
+	if (gcc_unlikely(size >= r.size)) {
+		/* buffer was not large enough; flush it and try
+		   again */
+
+		if (!Flush())
+			return false;
+
+		r = buffer.Write();
+
+		if (gcc_unlikely(size >= r.size)) {
+			/* still not enough space: grow the buffer and
+			   try again */
+			r.size = size + 1;
+			r.data = buffer.Write(r.size);
+		}
+
+		/* format into the new buffer */
+		va_start(ap, fmt);
+		size = vsnprintf(r.data, r.size, fmt, ap);
+		va_end(ap);
+
+		/* this time, it must fit */
+		assert(size < r.size);
+	}
+
+	buffer.Append(size);
+	return true;
+}
+
+bool
+BufferedOutputStream::Flush()
+{
+	if (!Check())
+		return false;
+
+	auto r = buffer.Read();
+	if (r.IsEmpty())
+		return true;
+
+	bool success = os.Write(r.data, r.size, last_error);
+	if (gcc_likely(success))
+		buffer.Consume(r.size);
+	return success;
+}
+
+bool
+BufferedOutputStream::Flush(Error &error)
+{
+	if (!Check(error))
+		return false;
+
+	auto r = buffer.Read();
+	if (r.IsEmpty())
+		return true;
+
+	bool success = os.Write(r.data, r.size, error);
+	if (gcc_likely(success))
+		buffer.Consume(r.size);
+	return success;
+}
diff --git a/src/fs/io/BufferedOutputStream.hxx b/src/fs/io/BufferedOutputStream.hxx
new file mode 100644
index 000000000..f2de758a2
--- /dev/null
+++ b/src/fs/io/BufferedOutputStream.hxx
@@ -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.
+ */
+
+#ifndef MPD_BUFFERED_OUTPUT_STREAM_HXX
+#define MPD_BUFFERED_OUTPUT_STREAM_HXX
+
+#include "check.h"
+#include "Compiler.h"
+#include "util/DynamicFifoBuffer.hxx"
+#include "util/Error.hxx"
+
+#include <stddef.h>
+
+class OutputStream;
+class Error;
+
+class BufferedOutputStream {
+	OutputStream &os;
+
+	DynamicFifoBuffer<char> buffer;
+
+	Error last_error;
+
+public:
+	BufferedOutputStream(OutputStream &_os)
+		:os(_os), buffer(32768) {}
+
+	bool Write(const void *data, size_t size);
+	bool Write(const char *p);
+
+	gcc_printf(2,3)
+	bool Format(const char *fmt, ...);
+
+	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 Flush();
+
+	bool Flush(Error &error);
+
+private:
+	bool AppendToBuffer(const void *data, size_t size);
+};
+
+#endif
diff --git a/src/fs/io/BufferedReader.cxx b/src/fs/io/BufferedReader.cxx
new file mode 100644
index 000000000..ba2f17dcf
--- /dev/null
+++ b/src/fs/io/BufferedReader.cxx
@@ -0,0 +1,82 @@
+/*
+ * 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 "BufferedReader.hxx"
+#include "Reader.hxx"
+#include "util/TextFile.hxx"
+
+bool
+BufferedReader::Fill(bool need_more)
+{
+	if (gcc_unlikely(last_error.IsDefined()))
+		return false;
+
+	if (eof)
+		return !need_more;
+
+	auto w = buffer.Write();
+	if (w.IsEmpty()) {
+		if (buffer.GetCapacity() >= MAX_SIZE)
+			return !need_more;
+
+		buffer.Grow(buffer.GetCapacity() * 2);
+		w = buffer.Write();
+		assert(!w.IsEmpty());
+	}
+
+	size_t nbytes = reader.Read(w.data, w.size, last_error);
+	if (nbytes == 0) {
+		if (gcc_unlikely(last_error.IsDefined()))
+			return false;
+
+		eof = true;
+		return !need_more;
+	}
+
+	buffer.Append(nbytes);
+	return true;
+}
+
+char *
+BufferedReader::ReadLine()
+{
+	do {
+		char *line = ReadBufferedLine(buffer);
+		if (line != nullptr)
+			return line;
+	} while (Fill(true));
+
+	if (last_error.IsDefined() || !eof || buffer.IsEmpty())
+		return nullptr;
+
+	auto w = buffer.Write();
+	if (w.IsEmpty()) {
+		buffer.Grow(buffer.GetCapacity() + 1);
+		w = buffer.Write();
+		assert(!w.IsEmpty());
+	}
+
+	/* terminate the last line */
+	w[0] = 0;
+
+	char *line = buffer.Read().data;
+	buffer.Clear();
+	return line;
+}
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
diff --git a/src/fs/io/FileOutputStream.cxx b/src/fs/io/FileOutputStream.cxx
new file mode 100644
index 000000000..dc4456d1f
--- /dev/null
+++ b/src/fs/io/FileOutputStream.cxx
@@ -0,0 +1,135 @@
+/*
+ * 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 "FileOutputStream.hxx"
+#include "fs/FileSystem.hxx"
+#include "system/fd_util.h"
+#include "util/Error.hxx"
+
+#ifdef WIN32
+
+FileOutputStream::FileOutputStream(Path _path, Error &error)
+	:path(_path),
+	 handle(CreateFile(path.c_str(), GENERIC_WRITE, 0, nullptr,
+			   TRUNCATE_EXISTING,
+			   FILE_ATTRIBUTE_NORMAL|FILE_FLAG_WRITE_THROUGH,
+			   nullptr))
+{
+	if (handle == INVALID_HANDLE_VALUE)
+		error.FormatLastError("Failed to create %s", path.c_str());
+}
+
+bool
+FileOutputStream::Write(const void *data, size_t size, Error &error)
+{
+	assert(IsDefined());
+
+	DWORD nbytes;
+	if (!WriteFile(handle, data, size, &nbytes, nullptr)) {
+		error.FormatLastError("Failed to write to %s", path.c_str());
+		return false;
+	}
+
+	if (size_t(nbytes) != size) {
+		error.FormatLastError(ERROR_DISK_FULL,
+				      "Failed to write to %s", path.c_str());
+		return false;
+	}
+
+	return true;
+}
+
+bool
+FileOutputStream::Commit(gcc_unused Error &error)
+{
+	assert(IsDefined());
+
+	CloseHandle(handle);
+	return true;
+}
+
+void
+FileOutputStream::Cancel()
+{
+	assert(IsDefined());
+
+	CloseHandle(handle);
+	RemoveFile(path);
+}
+
+#else
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+FileOutputStream::FileOutputStream(Path _path, Error &error)
+	:path(_path),
+	 fd(open_cloexec(path.c_str(),
+			 O_WRONLY|O_CREAT|O_TRUNC,
+			 0666))
+{
+	if (fd < 0)
+		error.FormatErrno("Failed to create %s", path.c_str());
+}
+
+bool
+FileOutputStream::Write(const void *data, size_t size, Error &error)
+{
+	assert(IsDefined());
+
+	ssize_t nbytes = write(fd, data, size);
+	if (nbytes < 0) {
+		error.FormatErrno("Failed to write to %s", path.c_str());
+		return false;
+	} else if ((size_t)nbytes < size) {
+		error.FormatErrno(ENOSPC,
+				  "Failed to write to %s", path.c_str());
+		return false;
+	}
+
+	return true;
+}
+
+bool
+FileOutputStream::Commit(Error &error)
+{
+	assert(IsDefined());
+
+	bool success = close(fd) == 0;
+	fd = -1;
+	if (!success)
+		error.FormatErrno("Failed to commit %s", path.c_str());
+
+	return success;
+}
+
+void
+FileOutputStream::Cancel()
+{
+	assert(IsDefined());
+
+	close(fd);
+	fd = -1;
+
+	RemoveFile(path);
+}
+
+#endif
diff --git a/src/fs/io/FileOutputStream.hxx b/src/fs/io/FileOutputStream.hxx
new file mode 100644
index 000000000..68174ec83
--- /dev/null
+++ b/src/fs/io/FileOutputStream.hxx
@@ -0,0 +1,68 @@
+/*
+ * 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_FILE_OUTPUT_STREAM_HXX
+#define MPD_FILE_OUTPUT_STREAM_HXX
+
+#include "check.h"
+#include "OutputStream.hxx"
+#include "fs/AllocatedPath.hxx"
+
+#include <assert.h>
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+class Path;
+
+class FileOutputStream final : public OutputStream {
+	AllocatedPath path;
+
+#ifdef WIN32
+	HANDLE handle;
+#else
+	int fd;
+#endif
+
+public:
+	FileOutputStream(Path _path, Error &error);
+
+	~FileOutputStream() {
+		if (IsDefined())
+			Cancel();
+	}
+
+
+	bool IsDefined() const {
+#ifdef WIN32
+		return handle != INVALID_HANDLE_VALUE;
+#else
+		return fd >= 0;
+#endif
+	}
+
+	bool Commit(Error &error);
+	void Cancel();
+
+	/* virtual methods from class OutputStream */
+	bool Write(const void *data, size_t size, Error &error) override;
+};
+
+#endif
diff --git a/src/fs/io/FileReader.cxx b/src/fs/io/FileReader.cxx
new file mode 100644
index 000000000..d63cd8ab0
--- /dev/null
+++ b/src/fs/io/FileReader.cxx
@@ -0,0 +1,98 @@
+/*
+ * 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 "FileReader.hxx"
+#include "system/fd_util.h"
+#include "util/Error.hxx"
+
+#ifdef WIN32
+
+FileReader::FileReader(Path _path, Error &error)
+	:path(_path),
+	 handle(CreateFile(path.c_str(), GENERIC_READ, FILE_SHARE_READ,
+			   nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
+			   nullptr))
+{
+	if (handle == INVALID_HANDLE_VALUE)
+		error.FormatLastError("Failed to open %s", path.c_str());
+}
+
+size_t
+FileReader::Read(void *data, size_t size, Error &error)
+{
+	assert(IsDefined());
+
+	DWORD nbytes;
+	if (!ReadFile(handle, data, size, &nbytes, nullptr)) {
+		error.FormatLastError("Failed to read from %s", path.c_str());
+		nbytes = 0;
+	}
+
+	return nbytes;
+}
+
+void
+FileReader::Close()
+{
+	assert(IsDefined());
+
+	CloseHandle(handle);
+}
+
+#else
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+FileReader::FileReader(Path _path, Error &error)
+	:path(_path),
+	 fd(open_cloexec(path.c_str(),
+			 O_RDONLY,
+			 0))
+{
+	if (fd < 0)
+		error.FormatErrno("Failed to open %s", path.c_str());
+}
+
+size_t
+FileReader::Read(void *data, size_t size, Error &error)
+{
+	assert(IsDefined());
+
+	ssize_t nbytes = read(fd, data, size);
+	if (nbytes < 0) {
+		error.FormatErrno("Failed to read from %s", path.c_str());
+		nbytes = 0;
+	}
+
+	return nbytes;
+}
+
+void
+FileReader::Close()
+{
+	assert(IsDefined());
+
+	close(fd);
+	fd = -1;
+}
+
+#endif
diff --git a/src/fs/io/FileReader.hxx b/src/fs/io/FileReader.hxx
new file mode 100644
index 000000000..34b43943c
--- /dev/null
+++ b/src/fs/io/FileReader.hxx
@@ -0,0 +1,67 @@
+/*
+ * 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_FILE_READER_HXX
+#define MPD_FILE_READER_HXX
+
+#include "check.h"
+#include "Reader.hxx"
+#include "fs/AllocatedPath.hxx"
+
+#include <assert.h>
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+class Path;
+
+class FileReader final : public Reader {
+	AllocatedPath path;
+
+#ifdef WIN32
+	HANDLE handle;
+#else
+	int fd;
+#endif
+
+public:
+	FileReader(Path _path, Error &error);
+
+	~FileReader() {
+		if (IsDefined())
+			Close();
+	}
+
+
+	bool IsDefined() const {
+#ifdef WIN32
+		return handle != INVALID_HANDLE_VALUE;
+#else
+		return fd >= 0;
+#endif
+	}
+
+	void Close();
+
+	/* virtual methods from class Reader */
+	size_t Read(void *data, size_t size, Error &error) override;
+};
+
+#endif
diff --git a/src/fs/io/GunzipReader.cxx b/src/fs/io/GunzipReader.cxx
new file mode 100644
index 000000000..ad5e41784
--- /dev/null
+++ b/src/fs/io/GunzipReader.cxx
@@ -0,0 +1,101 @@
+/*
+ * 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 "GunzipReader.hxx"
+#include "lib/zlib/Domain.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+GunzipReader::GunzipReader(Reader &_next, Error &error)
+	:next(_next), eof(false)
+{
+	z.next_in = nullptr;
+	z.avail_in = 0;
+	z.zalloc = Z_NULL;
+	z.zfree = Z_NULL;
+	z.opaque = Z_NULL;
+
+	int result = inflateInit2(&z, 16 + MAX_WBITS);
+	if (result != Z_OK) {
+		z.opaque = this;
+		error.Set(zlib_domain, result, zError(result));
+	}
+}
+
+GunzipReader::~GunzipReader()
+{
+	if (IsDefined())
+		inflateEnd(&z);
+}
+
+inline bool
+GunzipReader::FillBuffer(Error &error)
+{
+	auto w = buffer.Write();
+	assert(!w.IsEmpty());
+
+	size_t nbytes = next.Read(w.data, w.size, error);
+	if (nbytes == 0)
+		return false;
+
+	buffer.Append(nbytes);
+	return true;
+}
+
+size_t
+GunzipReader::Read(void *data, size_t size, Error &error)
+{
+	if (eof)
+		return 0;
+
+	z.next_out = (Bytef *)data;
+	z.avail_out = size;
+
+	while (true) {
+		int flush = Z_NO_FLUSH;
+
+		auto r = buffer.Read();
+		if (r.IsEmpty()) {
+			if (FillBuffer(error))
+				r = buffer.Read();
+			else if (error.IsDefined())
+				return 0;
+			else
+				flush = Z_FINISH;
+		}
+
+		z.next_in = r.data;
+		z.avail_in = r.size;
+
+		int result = inflate(&z, flush);
+		if (result == Z_STREAM_END) {
+			eof = true;
+			return size - z.avail_out;
+		} else if (result != Z_OK) {
+			error.Set(zlib_domain, result, zError(result));
+			return 0;
+		}
+
+		buffer.Consume(r.size - z.avail_in);
+
+		if (z.avail_out < size)
+			return size - z.avail_out;
+	}
+}
diff --git a/src/fs/io/GunzipReader.hxx b/src/fs/io/GunzipReader.hxx
new file mode 100644
index 000000000..34fc653fa
--- /dev/null
+++ b/src/fs/io/GunzipReader.hxx
@@ -0,0 +1,67 @@
+/*
+ * 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_GUNZIP_READER_HXX
+#define MPD_GUNZIP_READER_HXX
+
+#include "check.h"
+#include "Reader.hxx"
+#include "util/StaticFifoBuffer.hxx"
+
+#include <zlib.h>
+
+class Error;
+class Domain;
+
+/**
+ * A filter that decompresses data using zlib.
+ */
+class GunzipReader final : public Reader {
+	Reader &next;
+
+	bool eof;
+
+	z_stream z;
+
+	StaticFifoBuffer<Bytef, 4096> buffer;
+
+public:
+	/**
+	 * Construct the filter.  Call IsDefined() to check whether
+	 * the constructor has succeeded.  If not, #error will hold
+	 * information about the failure.
+	 */
+	GunzipReader(Reader &_next, Error &error);
+	~GunzipReader();
+
+	/**
+	 * Check whether the constructor has succeeded.
+	 */
+	bool IsDefined() const {
+		return z.opaque == nullptr;
+	}
+
+	/* virtual methods from class Reader */
+	virtual size_t Read(void *data, size_t size, Error &error) override;
+
+private:
+	bool FillBuffer(Error &error);
+};
+
+#endif
diff --git a/src/fs/io/GzipOutputStream.cxx b/src/fs/io/GzipOutputStream.cxx
new file mode 100644
index 000000000..27ae6b2ad
--- /dev/null
+++ b/src/fs/io/GzipOutputStream.cxx
@@ -0,0 +1,105 @@
+/*
+ * 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 "GzipOutputStream.hxx"
+#include "lib/zlib/Domain.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+GzipOutputStream::GzipOutputStream(OutputStream &_next, Error &error)
+	:next(_next)
+{
+	z.next_in = nullptr;
+	z.avail_in = 0;
+	z.zalloc = Z_NULL;
+	z.zfree = Z_NULL;
+	z.opaque = Z_NULL;
+
+	constexpr int windowBits = 15;
+	constexpr int gzip_encoding = 16;
+
+	int result = deflateInit2(&z, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+				  windowBits | gzip_encoding,
+				  8, Z_DEFAULT_STRATEGY);
+	if (result != Z_OK) {
+		z.opaque = this;
+		error.Set(zlib_domain, result, zError(result));
+	}
+}
+
+GzipOutputStream::~GzipOutputStream()
+{
+	if (IsDefined())
+		deflateEnd(&z);
+}
+
+bool
+GzipOutputStream::Flush(Error &error)
+{
+	/* no more input */
+	z.next_in = nullptr;
+	z.avail_in = 0;
+
+	while (true) {
+		Bytef output[4096];
+		z.next_out = output;
+		z.avail_out = sizeof(output);
+
+		int result = deflate(&z, Z_FINISH);
+		if (z.next_out > output &&
+		    !next.Write(output, z.next_out - output, error))
+			return false;
+
+		if (result == Z_STREAM_END)
+			return true;
+		else if (result != Z_OK) {
+			error.Set(zlib_domain, result, zError(result));
+			return false;
+		}
+    }
+}
+
+bool
+GzipOutputStream::Write(const void *_data, size_t size, Error &error)
+{
+	/* zlib's API requires non-const input pointer */
+	void *data = const_cast<void *>(_data);
+
+	z.next_in = reinterpret_cast<Bytef *>(data);
+	z.avail_in = size;
+
+	while (z.avail_in > 0) {
+		Bytef output[4096];
+		z.next_out = output;
+		z.avail_out = sizeof(output);
+
+		int result = deflate(&z, Z_NO_FLUSH);
+		if (result != Z_OK) {
+			error.Set(zlib_domain, result, zError(result));
+			return false;
+		}
+
+		if (z.next_out > output &&
+		    !next.Write(output, z.next_out - output, error))
+			return false;
+	}
+
+	return true;
+}
diff --git a/src/fs/io/GzipOutputStream.hxx b/src/fs/io/GzipOutputStream.hxx
new file mode 100644
index 000000000..e23835de8
--- /dev/null
+++ b/src/fs/io/GzipOutputStream.hxx
@@ -0,0 +1,69 @@
+/*
+ * 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_GZIP_OUTPUT_STREAM_HXX
+#define MPD_GZIP_OUTPUT_STREAM_HXX
+
+#include "check.h"
+#include "OutputStream.hxx"
+
+#include <assert.h>
+#include <zlib.h>
+
+class Error;
+class Domain;
+
+/**
+ * A filter that compresses data written to it using zlib, forwarding
+ * compressed data in the "gzip" format.
+ *
+ * Don't forget to call Flush() before destructing this object.
+ */
+class GzipOutputStream final : public OutputStream {
+	OutputStream &next;
+
+	z_stream z;
+
+public:
+	/**
+	 * Construct the filter.  Call IsDefined() to check whether
+	 * the constructor has succeeded.  If not, #error will hold
+	 * information about the failure.
+	 */
+	GzipOutputStream(OutputStream &_next, Error &error);
+	~GzipOutputStream();
+
+	/**
+	 * Check whether the constructor has succeeded.
+	 */
+	bool IsDefined() const {
+		return z.opaque == nullptr;
+	}
+
+	/**
+	 * Finish the file and write all data remaining in zlib's
+	 * output buffer.
+	 */
+	bool Flush(Error &error);
+
+	/* virtual methods from class OutputStream */
+	bool Write(const void *data, size_t size, Error &error) override;
+};
+
+#endif
diff --git a/src/fs/io/OutputStream.hxx b/src/fs/io/OutputStream.hxx
new file mode 100644
index 000000000..71311c71f
--- /dev/null
+++ b/src/fs/io/OutputStream.hxx
@@ -0,0 +1,38 @@
+/*
+ * 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_OUTPUT_STREAM_HXX
+#define MPD_OUTPUT_STREAM_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+#include <stddef.h>
+
+class Error;
+
+class OutputStream {
+public:
+	OutputStream() = default;
+	OutputStream(const OutputStream &) = delete;
+
+	virtual bool Write(const void *data, size_t size, Error &error) = 0;
+};
+
+#endif
diff --git a/src/fs/io/PeekReader.cxx b/src/fs/io/PeekReader.cxx
new file mode 100644
index 000000000..2e8042ab6
--- /dev/null
+++ b/src/fs/io/PeekReader.cxx
@@ -0,0 +1,60 @@
+/*
+ * 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 "PeekReader.hxx"
+
+#include <algorithm>
+
+#include <assert.h>
+#include <string.h>
+
+const void *
+PeekReader::Peek(size_t size, Error &error)
+{
+	assert(size > 0);
+	assert(size < sizeof(buffer));
+	assert(buffer_size == 0);
+	assert(buffer_position == 0);
+
+	do {
+		size_t nbytes = next.Read(buffer + buffer_size,
+					size - buffer_size, error);
+		if (nbytes == 0)
+			return nullptr;
+
+		buffer_size += nbytes;
+	} while (buffer_size < size);
+
+	return buffer;
+}
+
+size_t
+PeekReader::Read(void *data, size_t size, Error &error)
+{
+	size_t buffer_remaining = buffer_size - buffer_position;
+	if (buffer_remaining > 0) {
+		size_t nbytes = std::min(buffer_remaining, size);
+		memcpy(data, buffer + buffer_position, nbytes);
+		buffer_position += nbytes;
+		return nbytes;
+	}
+
+	return next.Read(data, size, error);
+}
diff --git a/src/fs/io/PeekReader.hxx b/src/fs/io/PeekReader.hxx
new file mode 100644
index 000000000..27e7ff7c1
--- /dev/null
+++ b/src/fs/io/PeekReader.hxx
@@ -0,0 +1,52 @@
+/*
+ * 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_PEEK_READER_HXX
+#define MPD_PEEK_READER_HXX
+
+#include "check.h"
+#include "Reader.hxx"
+
+#include <stdint.h>
+
+class AutoGunzipReader;
+
+/**
+ * A filter that allows the caller to peek the first few bytes without
+ * consuming them.  The first call must be Peek(), and the following
+ * Read() will deliver the same bytes again.
+ */
+class PeekReader final : public Reader {
+	Reader &next;
+
+	size_t buffer_size, buffer_position;
+
+	uint8_t buffer[64];
+
+public:
+	PeekReader(Reader &_next)
+		:next(_next), buffer_size(0), buffer_position(0) {}
+
+	const void *Peek(size_t size, Error &error);
+
+	/* virtual methods from class Reader */
+	virtual size_t Read(void *data, size_t size, Error &error) override;
+};
+
+#endif
diff --git a/src/fs/io/Reader.hxx b/src/fs/io/Reader.hxx
new file mode 100644
index 000000000..d41e92dd0
--- /dev/null
+++ b/src/fs/io/Reader.hxx
@@ -0,0 +1,52 @@
+/*
+ * 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_READER_HXX
+#define MPD_READER_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+#include <stddef.h>
+
+class Error;
+
+/**
+ * An interface that can read bytes from a stream until the stream
+ * ends.
+ *
+ * This interface is simpler and less cumbersome to use than
+ * #InputStream.
+ */
+class Reader {
+public:
+	Reader() = default;
+	Reader(const Reader &) = delete;
+
+	/**
+	 * Read data from the stream.
+	 *
+	 * @return the number of bytes read into the given buffer or 0
+	 * on error/end-of-stream
+	 */
+	gcc_nonnull_all
+	virtual size_t Read(void *data, size_t size, Error &error) = 0;
+};
+
+#endif
diff --git a/src/fs/io/StdioOutputStream.hxx b/src/fs/io/StdioOutputStream.hxx
new file mode 100644
index 000000000..e00db922f
--- /dev/null
+++ b/src/fs/io/StdioOutputStream.hxx
@@ -0,0 +1,45 @@
+/*
+ * 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_STDIO_OUTPUT_STREAM_HXX
+#define MPD_STDIO_OUTPUT_STREAM_HXX
+
+#include "check.h"
+#include "OutputStream.hxx"
+#include "fs/AllocatedPath.hxx"
+
+#include <stdio.h>
+
+class StdioOutputStream final : public OutputStream {
+	FILE *const file;
+
+public:
+	StdioOutputStream(FILE *_file):file(_file) {}
+
+	/* virtual methods from class OutputStream */
+	bool Write(const void *data, size_t size,
+		   gcc_unused Error &error) override {
+		fwrite(data, 1, size, file);
+
+		/* this class is debug-only and ignores errors */
+		return true;
+	}
+};
+
+#endif
diff --git a/src/fs/io/TextFile.cxx b/src/fs/io/TextFile.cxx
new file mode 100644
index 000000000..28d6dabcb
--- /dev/null
+++ b/src/fs/io/TextFile.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 "TextFile.hxx"
+#include "FileReader.hxx"
+#include "AutoGunzipReader.hxx"
+#include "BufferedReader.hxx"
+#include "fs/Path.hxx"
+
+#include <assert.h>
+
+TextFile::TextFile(Path path_fs, Error &error)
+	:file_reader(new FileReader(path_fs, error)),
+#ifdef HAVE_ZLIB
+	 gunzip_reader(file_reader->IsDefined()
+		       ? new AutoGunzipReader(*file_reader)
+		       : nullptr),
+#endif
+	 buffered_reader(file_reader->IsDefined()
+			 ? new BufferedReader(*
+#ifdef HAVE_ZLIB
+					      gunzip_reader
+#else
+					      file_reader
+#endif
+					      )
+			 : nullptr)
+{
+}
+
+TextFile::~TextFile()
+{
+	delete buffered_reader;
+#ifdef HAVE_ZLIB
+	delete gunzip_reader;
+#endif
+	delete file_reader;
+}
+
+char *
+TextFile::ReadLine()
+{
+	assert(buffered_reader != nullptr);
+
+	return buffered_reader->ReadLine();
+}
+
+bool
+TextFile::Check(Error &error) const
+{
+	assert(buffered_reader != nullptr);
+
+	return buffered_reader->Check(error);
+}
diff --git a/src/fs/io/TextFile.hxx b/src/fs/io/TextFile.hxx
new file mode 100644
index 000000000..5577363e7
--- /dev/null
+++ b/src/fs/io/TextFile.hxx
@@ -0,0 +1,73 @@
+/*
+ * 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_TEXT_FILE_HXX
+#define MPD_TEXT_FILE_HXX
+
+#include "check.h"
+#include "Compiler.h"
+
+#include <stddef.h>
+
+class Path;
+class Error;
+class FileReader;
+class AutoGunzipReader;
+class BufferedReader;
+
+class TextFile {
+	FileReader *const file_reader;
+
+#ifdef HAVE_ZLIB
+	AutoGunzipReader *const gunzip_reader;
+#endif
+
+	BufferedReader *const buffered_reader;
+
+public:
+	TextFile(Path path_fs, Error &error);
+
+	TextFile(const TextFile &other) = delete;
+
+	~TextFile();
+
+	bool HasFailed() const {
+		return gcc_unlikely(buffered_reader == nullptr);
+	}
+
+	/**
+	 * Reads a line from the input file, and strips trailing
+	 * space.  There is a reasonable maximum line length, only to
+	 * prevent denial of service.
+	 *
+	 * Use Check() after nullptr has been returned to check
+	 * whether an error occurred or end-of-file has been reached.
+	 *
+	 * @param file the source file, opened in text mode
+	 * @return a pointer to the line, or nullptr on end-of-file or error
+	 */
+	char *ReadLine();
+
+	/**
+	 * Check whether a ReadLine() call has thrown an error.
+	 */
+	bool Check(Error &error) const;
+};
+
+#endif