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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef RTC_BASE_FILE_H_
#define RTC_BASE_FILE_H_
#include <stdint.h>
#include <string>
#include "rtc_base/constructormagic.h"
#include "rtc_base/pathutils.h"
#include "rtc_base/platform_file.h"
namespace rtc {
// This class wraps the platform specific APIs for simple file interactions.
//
// The various read and write methods are best effort, i.e. if an underlying
// call does not manage to read/write all the data more calls will be performed,
// until an error is detected or all data is read/written.
class File {
public:
// Wraps the given PlatformFile. This class is then responsible for closing
// the file, which will be done in the destructor if Close is never called.
explicit File(PlatformFile);
// The default constructor produces a closed file.
File();
~File();
File(File&& other);
File& operator=(File&& other);
// Open and Create give files with both reading and writing enabled.
static File Open(const std::string& path);
static File Open(Pathname&& path);
static File Open(const Pathname& path);
// If the file already exists it will be overwritten.
static File Create(const std::string& path);
static File Create(Pathname&& path);
static File Create(const Pathname& path);
// Remove a file in the file system.
static bool Remove(const std::string& path);
static bool Remove(Pathname&& path);
static bool Remove(const Pathname& path);
size_t Write(const uint8_t* data, size_t length);
size_t Read(uint8_t* buffer, size_t length);
// The current position in the file after a call to these methods is platform
// dependent (MSVC gives position offset+length, most other
// compilers/platforms do not alter the position), i.e. do not depend on it,
// do a Seek before any subsequent Read/Write.
size_t WriteAt(const uint8_t* data, size_t length, size_t offset);
size_t ReadAt(uint8_t* buffer, size_t length, size_t offset);
// Attempt to position the file at the given offset from the start.
// Returns true if successful, false otherwise.
bool Seek(size_t offset);
// Attempt to close the file. Returns true if successful, false otherwise,
// most notably when the file is already closed.
bool Close();
bool IsOpen();
private:
PlatformFile file_;
RTC_DISALLOW_COPY_AND_ASSIGN(File);
};
} // namespace rtc
#endif // RTC_BASE_FILE_H_
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