blob: 0bb86a397f9060bfe433d9e356f4f989f6555f00 [file] [log] [blame]
* Copyright (c) 2011 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.
#include <stddef.h>
#include <stdio.h>
#include "rtc_base/criticalsection.h"
// Implementation that can read (exclusive) or write from/to a file.
namespace webrtc {
// TODO(tommi): Rename to rtc::File and move to base.
class FileWrapper final {
static const size_t kMaxFileNameSize = 1024;
// Factory methods.
// TODO(tommi): Remove Create().
static FileWrapper* Create();
static FileWrapper Open(const char* file_name_utf8, bool read_only);
FileWrapper(FILE* file, size_t max_size);
// Support for move semantics.
FileWrapper(FileWrapper&& other);
FileWrapper& operator=(FileWrapper&& other);
// Returns true if a file has been opened.
bool is_open() const { return file_ != nullptr; }
// Opens a file in read or write mode, decided by the read_only parameter.
bool OpenFile(const char* file_name_utf8, bool read_only);
// Initializes the wrapper from an existing handle. The wrapper
// takes ownership of |handle| and closes it in CloseFile().
bool OpenFromFileHandle(FILE* handle);
void CloseFile();
// Limits the file size to |bytes|. Writing will fail after the cap
// is hit. Pass zero to use an unlimited size.
// TODO(tommi): Could we move this out into a separate class?
void SetMaxFileSize(size_t bytes);
// Flush any pending writes. Note: Flushing when closing, is not required.
int Flush();
// Rewinds the file to the start.
int Rewind();
int Read(void* buf, size_t length);
bool Write(const void* buf, size_t length);
void CloseFileImpl();
int FlushImpl();
// TODO(tommi): Remove the lock.
rtc::CriticalSection lock_;
FILE* file_ = nullptr;
size_t position_ = 0;
size_t max_size_in_bytes_ = 0;
// Copying is not supported.
FileWrapper(const FileWrapper&) = delete;
FileWrapper& operator=(const FileWrapper&) = delete;
} // namespace webrtc