99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
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/****************************************************************************
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Copyright (c) 2006, Radon Labs GmbH
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#pragma once
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//------------------------------------------------------------------------------
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/**
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@class IO::MemoryStream
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Implements a stream class which writes to and reads from system RAM.
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Memory streams provide memory mapping for fast direct read/write access.
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*/
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#include "io/stream.h"
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//------------------------------------------------------------------------------
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namespace IO
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{
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class MemoryStream : public Stream
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{
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__DeclareClass(MemoryStream);
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public:
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/// constructor
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MemoryStream();
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/// destructor
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virtual ~MemoryStream();
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/// memory streams support reading
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virtual bool CanRead() const;
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/// memory streams support writing
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virtual bool CanWrite() const;
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/// memory streams support seeking
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virtual bool CanSeek() const;
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/// memory streams are mappable
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virtual bool CanBeMapped() const;
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/// set new size of the stream in bytes
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virtual void SetSize(Size s);
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/// get the size of the stream in bytes
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virtual Size GetSize() const;
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/// get the current position of the read/write cursor
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virtual Position GetPosition() const;
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/// open the stream
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virtual bool Open();
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/// close the stream
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virtual void Close();
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/// directly write to the stream
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virtual void Write(const void* ptr, Size numBytes);
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/// directly read from the stream
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virtual Size Read(void* ptr, Size numBytes);
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/// seek in stream
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virtual void Seek(Offset offset, SeekOrigin origin);
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/// return true if end-of-stream reached
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virtual bool Eof() const;
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/// map for direct memory-access
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virtual void* Map();
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/// unmap a mapped stream
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virtual void Unmap();
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/// copy data to memory
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virtual Size Copy( void* ptr, Size numBytes )const;
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/// get a direct "raw" pointer to the data
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void* GetRawPointer() const;
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virtual bool IsHeader( void* headPtr, Size numBytes );
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private:
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/// re-allocate the memory buffer
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void Realloc(Size s);
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/// return true if there's enough space for n more bytes
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bool HasRoom(Size numBytes) const;
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/// make room for at least n more bytes
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void MakeRoom(Size numBytes);
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static const Size InitialSize = 256;
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Size capacity;
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Size size;
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Position position;
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unsigned char* buffer;
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};
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} // namespace IO
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//------------------------------------------------------------------------------
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