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parasiticdatabuffer.h

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00001 /*
00002     Copyright (C) 2005 by Jorrit Tyberghein
00003               (C) 2005 by Frank Richter
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00024 #ifndef __CS_CSUTIL_PARASITICDATABUFFER_H__
00025 #define __CS_CSUTIL_PARASITICDATABUFFER_H__
00026 
00027 #include "csextern.h"
00028 #include "csutil/pooledscfclass.h"
00029 #include "iutil/databuff.h"
00030 
00031 class csParasiticDataBufferBase : public iDataBuffer
00032 {
00033 protected:
00034   csRef<iDataBuffer> parentBuffer;
00035   uint8* data;
00036   size_t size;
00037   
00038   void SetContents (iDataBuffer* parent, size_t offs, size_t size)
00039   {
00040     parentBuffer = parent;
00041     data = parent->GetUint8 () + offs;
00042     size_t parRemaining = parent->GetSize () - offs;
00043     if (size == (size_t)~0)
00044       csParasiticDataBufferBase::size = parRemaining;
00045     else
00046       csParasiticDataBufferBase::size = MIN(size, parRemaining);
00047   }
00048 
00049   csParasiticDataBufferBase (iDataBuffer* parent, size_t offs,
00050     size_t size = (size_t)~0)
00051   {
00052     SetContents (parent, offs, size);
00053   }
00054 
00055   csParasiticDataBufferBase () : data(0), size(0) {}
00056 public:
00057   virtual ~csParasiticDataBufferBase () { }
00058 
00059   virtual size_t GetSize () const
00060   { return size; }
00061   virtual char* GetData () const
00062   { return (char*)data; }
00063   inline char *operator * () const
00064   { return (char *)GetData (); }
00065   inline int8* GetInt8 ()
00066   { return (int8 *)GetData (); }
00067   inline uint8* GetUint8 ()
00068   { return (uint8 *)GetData (); }
00069 };
00070 
00074 class CS_CRYSTALSPACE_EXPORT csParasiticDataBuffer : public csParasiticDataBufferBase
00075 {
00076 public:
00077     SCF_DECLARE_IBASE;
00078 
00087   csParasiticDataBuffer (iDataBuffer* parent, size_t offs,
00088     size_t size = (size_t)~0) : csParasiticDataBufferBase (parent, offs, size)
00089   {
00090     SCF_CONSTRUCT_IBASE(0);
00091   }
00092 
00093   virtual ~csParasiticDataBuffer ()
00094   {
00095     SCF_DESTRUCT_IBASE();
00096   }
00097 };
00098 
00113 class CS_CRYSTALSPACE_EXPORT csParasiticDataBufferPooled : 
00114   public csParasiticDataBufferBase
00115 {
00116 public:
00117   SCF_DECLARE_IBASE_POOLED_EXTERN(CS_CRYSTALSPACE_EXPORT, 
00118     csParasiticDataBufferPooled);
00119 
00120   virtual ~csParasiticDataBufferPooled ()
00121   {
00122     SCF_DESTRUCT_IBASE();
00123   }
00124 
00129   void SetContents (iDataBuffer* parent, size_t offs, 
00130     size_t size = (size_t)~0)
00131   {
00132     csParasiticDataBufferBase::SetContents (parent, offs, size);
00133   }
00134 protected:
00135   csParasiticDataBufferPooled (Pool* pool) : csParasiticDataBufferBase()
00136   {
00137     SCF_CONSTRUCT_IBASE_POOLED (pool);
00138   }
00139 };
00140 
00141 #endif // __CS_CSUTIL_PARASITICDATABUFFER_H__

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