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/*
* 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.
*/
#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
#include <stddef.h>
#include "common_types.h"
#include "typedefs.h"
// Implementation of an InStream and OutStream that can read (exclusive) or
// write from/to a file.
namespace webrtc {
class FileWrapper : public InStream, public OutStream
{
public:
static const size_t kMaxFileNameSize = 1024;
// Factory method. Constructor disabled.
static FileWrapper* Create();
// Returns true if a file has been opened.
virtual bool Open() const = 0;
// Opens a file in read or write mode, decided by the readOnly parameter.
virtual int OpenFile(const char* fileNameUTF8,
bool readOnly,
bool loop = false,
bool text = false) = 0;
virtual int CloseFile() = 0;
// Limits the file size to |bytes|. Writing will fail after the cap
// is hit. Pass zero to use an unlimited size.
virtual int SetMaxFileSize(size_t bytes) = 0;
// Flush any pending writes.
virtual int Flush() = 0;
// Returns the opened file's name in |fileNameUTF8|. Provide the size of
// the buffer in bytes in |size|. The name will be truncated if |size| is
// too small.
virtual int FileName(char* fileNameUTF8,
size_t size) const = 0;
// Write |format| to the opened file. Arguments are taken in the same manner
// as printf. That is, supply a format string containing text and
// specifiers. Returns the number of characters written or -1 on error.
virtual int WriteText(const char* format, ...) = 0;
// Inherited from Instream.
// Reads |length| bytes from file to |buf|. Returns the number of bytes read
// or -1 on error.
virtual int Read(void* buf, int length) = 0;
// Inherited from OutStream.
// Writes |length| bytes from |buf| to file. The actual writing may happen
// some time later. Call Flush() to force a write.
virtual bool Write(const void *buf, int length) = 0;
// Inherited from both Instream and OutStream.
// Rewinds the file to the start. Only available when OpenFile() has been
// called with |loop| == true or |readOnly| == true.
virtual int Rewind() = 0;
};
} // namespace webrtc
#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
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