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88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
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#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
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#include <stddef.h>
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#include <stdio.h>
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#include "webrtc/common_types.h"
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#include "webrtc/typedefs.h"
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// Implementation of an InStream and OutStream that can read (exclusive) or
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// write from/to a file.
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namespace webrtc {
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class FileWrapper : public InStream, public OutStream {
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public:
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static const size_t kMaxFileNameSize = 1024;
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// Factory method. Constructor disabled.
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static FileWrapper* Create();
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// Returns true if a file has been opened.
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virtual bool Open() const = 0;
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// Opens a file in read or write mode, decided by the read_only parameter.
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virtual int OpenFile(const char* file_name_utf8,
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bool read_only,
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bool loop = false,
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bool text = false) = 0;
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// Initializes the wrapper from an existing handle. |read_only| must match in
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// the mode the file was opened in. If |manage_file| is true, the wrapper
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// takes ownership of |handle| and closes it in CloseFile().
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virtual int OpenFromFileHandle(FILE* handle,
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bool manage_file,
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bool read_only,
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bool loop = false) = 0;
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virtual int CloseFile() = 0;
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// Limits the file size to |bytes|. Writing will fail after the cap
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// is hit. Pass zero to use an unlimited size.
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virtual int SetMaxFileSize(size_t bytes) = 0;
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// Flush any pending writes.
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virtual int Flush() = 0;
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// Returns the opened file's name in |file_name_utf8|. Provide the size of
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// the buffer in bytes in |size|. The name will be truncated if |size| is
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// too small.
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virtual int FileName(char* file_name_utf8,
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size_t size) const = 0;
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// Write |format| to the opened file. Arguments are taken in the same manner
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// as printf. That is, supply a format string containing text and
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// specifiers. Returns the number of characters written or -1 on error.
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virtual int WriteText(const char* format, ...) = 0;
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// Inherited from Instream.
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// Reads |length| bytes from file to |buf|. Returns the number of bytes read
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// or -1 on error.
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virtual int Read(void* buf, int length) = 0;
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// Inherited from OutStream.
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// Writes |length| bytes from |buf| to file. The actual writing may happen
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// some time later. Call Flush() to force a write.
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virtual bool Write(const void* buf, int length) = 0;
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// Inherited from both Instream and OutStream.
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// Rewinds the file to the start. Only available when OpenFile() has been
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// called with |loop| == true or |readOnly| == true.
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virtual int Rewind() = 0;
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};
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} // namespace webrtc
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#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_FILE_WRAPPER_H_
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