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