0a891b23be
git-svn-id: https://matroska.svn.sourceforge.net/svnroot/matroska/trunk/libebml@1 a6f86f6d-0131-4f8e-9e7b-e335508773d5
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
/****************************************************************************
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** libebml : parse EBML files, see http://embl.sourceforge.net/
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**
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** <file/class description>
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**
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** Copyright (C) 2003-2004 Jory Stone. All rights reserved.
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**
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** This library is free software; you can redistribute it and/or
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** modify it under the terms of the GNU Lesser General Public
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** License as published by the Free Software Foundation; either
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** version 2.1 of the License, or (at your option) any later version.
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**
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** This library is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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** Lesser General Public License for more details.
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**
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** You should have received a copy of the GNU Lesser General Public
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** License along with this library; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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**
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** See http://www.matroska.org/license/lgpl/ for LGPL licensing information.
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**
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** Contact license@matroska.org if any conditions of this licensing are
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** not clear to you.
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**
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**********************************************************************/
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/*!
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\file
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\version \$Id: MemIOCallback.h 1298 2008-02-21 22:14:18Z mosu $
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\author Jory Stone <jcsston @ toughguy.net>
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*/
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#ifndef LIBEBML_MEMIOCALLBACK_H
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#define LIBEBML_MEMIOCALLBACK_H
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#include "IOCallback.h"
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#include <string>
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#ifndef __BEOS__
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#include <sstream>
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#else
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#include <strstream>
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#define stringstream strstream
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#endif
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START_LIBEBML_NAMESPACE
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class EBML_DLL_API MemIOCallback : public IOCallback
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{
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public:
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MemIOCallback(uint64 DefaultSize = 128);
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~MemIOCallback();
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/*!
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Use this to copy some data to the Buffer from this classes data
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*/
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uint32 read(void *Buffer, size_t Size);
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/*!
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Seek to the specified position. The mode can have either SEEK_SET, SEEK_CUR
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or SEEK_END. The callback should return true(1) if the seek operation succeeded
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or false (0), when the seek fails.
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*/
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void setFilePointer(int64 Offset, seek_mode Mode=seek_beginning);
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/*!
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This callback just works like its read pendant. It returns the number of bytes written.
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*/
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size_t write(const void *Buffer, size_t Size);
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/*!
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Although the position is always positive, the return value of this callback is signed to
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easily allow negative values for returning errors. When an error occurs, the implementor
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should return -1 and the file pointer otherwise.
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If an error occurs, an exception should be thrown.
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*/
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virtual uint64 getFilePointer() {return dataBufferPos;};
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/*!
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The close callback flushes the file buffers to disk and closes the file. When using the stdio
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library, this is equivalent to calling fclose. When the close is not successful, an exception
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should be thrown.
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*/
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void close() {};
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binary *GetDataBuffer() const {return dataBuffer;};
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uint64 GetDataBufferSize() {return dataBufferTotalSize;};
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void SetDataBufferSize(uint64 newDataBufferSize) {dataBufferTotalSize = newDataBufferSize;};
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/*!
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Use this to write some data from another IOCallback
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*/
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uint32 write(IOCallback & IOToRead, size_t Size);
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bool IsOk() { return mOk; };
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const std::string &GetLastErrorStr() { return mLastErrorStr; };
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protected:
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bool mOk;
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std::string mLastErrorStr;
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binary *dataBuffer;
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/*!
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Postion where we start 'writing' to the dataBuffer
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*/
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uint64 dataBufferPos;
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/*!
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Size of the data in the dataBuffer
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*/
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uint64 dataBufferTotalSize;
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/*!
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Size of the memory malloc()/realloc()
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*/
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uint64 dataBufferMemorySize;
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};
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END_LIBEBML_NAMESPACE
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#endif // LIBEBML_MEMIOCALLBACK_H
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