fs/io: move to io/

src/io/FileReader.hxx

@@ -0,0 +1,133 @@
+/*
+ * Copyright 2014-2019 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FILE_READER_HXX
+#define FILE_READER_HXX
+
+#include "Reader.hxx"
+#include "fs/AllocatedPath.hxx"
+
+#ifdef _WIN32
+#include <fileapi.h>
+#include <handleapi.h> // for INVALID_HANDLE_VALUE
+#include <windef.h> // for HWND (needed by winbase.h)
+#include <winbase.h> // for FILE_CURRENT
+#else
+#include "io/UniqueFileDescriptor.hxx"
+#endif
+
+class Path;
+class FileInfo;
+
+class FileReader final : public Reader {
+	AllocatedPath path;
+
+#ifdef _WIN32
+	HANDLE handle;
+#else
+	UniqueFileDescriptor fd;
+#endif
+
+public:
+	explicit FileReader(Path _path);
+
+#ifdef _WIN32
+	FileReader(FileReader &&other) noexcept
+		:path(std::move(other.path)),
+		 handle(std::exchange(other.handle, INVALID_HANDLE_VALUE)) {}
+
+	~FileReader() noexcept {
+		if (IsDefined())
+			Close();
+	}
+#else
+	FileReader(FileReader &&other) noexcept
+		:path(std::move(other.path)),
+		 fd(std::move(other.fd)) {}
+#endif
+
+
+protected:
+	bool IsDefined() const noexcept {
+#ifdef _WIN32
+		return handle != INVALID_HANDLE_VALUE;
+#else
+		return fd.IsDefined();
+#endif
+	}
+
+public:
+#ifndef _WIN32
+	FileDescriptor GetFD() const noexcept {
+		return fd;
+	}
+#endif
+
+	void Close() noexcept;
+
+	FileInfo GetFileInfo() const;
+
+	[[gnu::pure]]
+	uint64_t GetSize() const noexcept {
+#ifdef _WIN32
+		LARGE_INTEGER size;
+		return GetFileSizeEx(handle, &size)
+			? size.QuadPart
+			: 0;
+#else
+		return fd.GetSize();
+#endif
+	}
+
+	[[gnu::pure]]
+	uint64_t GetPosition() const noexcept {
+#ifdef _WIN32
+		LARGE_INTEGER zero;
+		zero.QuadPart = 0;
+		LARGE_INTEGER position;
+		return SetFilePointerEx(handle, zero, &position, FILE_CURRENT)
+			? position.QuadPart
+			: 0;
+#else
+		return fd.Tell();
+#endif
+	}
+
+	void Rewind() {
+		Seek(0);
+	}
+
+	void Seek(off_t offset);
+	void Skip(off_t offset);
+
+	/* virtual methods from class Reader */
+	size_t Read(void *data, size_t size) override;
+};
+
+#endif