PGFstream.h

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/*
 * The Progressive Graphics File; http://www.libpgf.org
 * 
 * $Date: 2007-06-11 10:56:17 +0200 (Mo, 11 Jun 2007) $
 * $Revision: 299 $
 * 
 * This file Copyright (C) 2006 xeraina GmbH, Switzerland
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */


#ifndef PGF_STREAM_H
#define PGF_STREAM_H

#include "PGFtypes.h"
#include <new>

class CPGFStream {
public:
    CPGFStream() {}

    virtual ~CPGFStream() {}

    virtual void Write(int *count, void *buffer)=0; 

    virtual void Read(int *count, void *buffer)=0; 

    virtual void SetPos(short posMode, INT64 posOff)=0;

    virtual UINT64 GetPos() const=0;

    virtual bool IsValid() const=0;
};

class CPGFFileStream : public CPGFStream {
protected:
    HANDLE m_hFile; 

public:
    CPGFFileStream() : m_hFile(0) {}
    CPGFFileStream(HANDLE hFile) : m_hFile(hFile) {}
    HANDLE GetHandle() { return m_hFile; }

    virtual ~CPGFFileStream() { m_hFile = 0; }
    virtual void Write(int *count, void *buffer) THROW_; // throws IOException 
    virtual void Read(int *count, void *buffer) THROW_; // throws IOException 
    virtual void SetPos(short posMode, INT64 posOff) THROW_; // throws IOException
    virtual UINT64 GetPos() const THROW_; // throws IOException
    virtual bool   IsValid() const  { return m_hFile != 0; }
};

class CPGFMemoryStream : public CPGFStream {
protected:
    UINT8 *m_buffer, *m_pos;
    UINT8 *m_eos;           
    size_t m_size;          
    bool   m_allocated;     

public:
    CPGFMemoryStream(size_t size) THROW_;
    
    CPGFMemoryStream(UINT8 *pBuffer, size_t size) THROW_;
    
    void Reinitialize(UINT8 *pBuffer, size_t size) THROW_;
    
    virtual ~CPGFMemoryStream() { 
        m_pos = 0; 
        if (m_allocated) {
            // the memory buffer has been allocated inside of CPMFmemoryStream constructor
            delete[] m_buffer; m_buffer = 0;
        }
    }

    virtual void Write(int *count, void *buffer) THROW_; // throws IOException 
    virtual void Read(int *count, void *buffer);
    virtual void SetPos(short posMode, INT64 posOff) THROW_; // throws IOException
    virtual UINT64 GetPos() const { ASSERT(IsValid()); return m_pos - m_buffer; }
    virtual bool   IsValid() const  { return m_buffer != 0; }

    size_t GetSize() const          { return m_size; }
    const UINT8* GetBuffer() const  { return m_buffer; }
    UINT8* GetBuffer()              { return m_buffer; }
    UINT64 GetEOS() const           { ASSERT(IsValid()); return m_eos - m_buffer; }
    void SetEOS(UINT64 length)      { ASSERT(IsValid()); m_eos = m_buffer + length; }
};

#ifdef _MFC_VER
class CPGFMemFileStream : public CPGFStream {
protected:
    CMemFile *m_memFile;    
public:
    CPGFMemFileStream(CMemFile *memFile) : m_memFile(memFile) {}
    virtual bool    IsValid() const { return m_memFile != NULL; }
    virtual ~CPGFMemFileStream() {}
    virtual void Write(int *count, void *buffer) THROW_; // throws IOException 
    virtual void Read(int *count, void *buffer) THROW_; // throws IOException 
    virtual void SetPos(short posMode, INT64 posOff) THROW_; // throws IOException
    virtual UINT64 GetPos() const THROW_; // throws IOException
};
#endif

#if defined(WIN32) || defined(WINCE)
class CPGFIStream : public CPGFStream {
protected:
    IStream *m_stream;  
public:
    CPGFIStream(IStream *stream) : m_stream(stream) {}
    virtual bool IsValid() const    { return m_stream != 0; }
    virtual ~CPGFIStream() {}
    virtual void Write(int *count, void *buffer) THROW_; // throws IOException 
    virtual void Read(int *count, void *buffer) THROW_; // throws IOException 
    virtual void SetPos(short posMode, INT64 posOff) THROW_; // throws IOException
    virtual UINT64 GetPos() const THROW_; // throws IOException
    IStream* GetIStream() const     { return m_stream; }
};
#endif

#endif // PGF_STREAM_H