examples/Multimedia/ICL/ICLCodec/ImageUtils.h

/*
Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:  
*/


#ifndef __ImageUtils_h
#define __ImageUtils_h


//
// PtrReadUtil - utility class with methods for standard 
// reading data from a TUint8* string
//

class PtrReadUtil
        {
public:
        // This calls decode from TUint8*
        static TInt8 ReadInt8(const TUint8* aPtr);
        static TUint8 ReadUint8(const TUint8* aPtr);
        static TInt16 ReadInt16(const TUint8* aPtr);
        static TInt16 ReadBigEndianInt16(const TUint8* aPtr);
        static TUint16 ReadUint16(const TUint8* aPtr);
        static TUint16 ReadBigEndianUint16(const TUint8* aPtr);
        static TInt32 ReadInt32(const TUint8* aPtr);
        static TInt32 ReadBigEndianInt32(const TUint8* aPtr);
        static TUint32 ReadUint32(const TUint8* aPtr);
        static TUint32 ReadBigEndianUint32(const TUint8* aPtr);
        // these calls also increment the pointer
        static TInt8 ReadInt8Inc(const TUint8*& aPtr);
        static TUint8 ReadUint8Inc(const TUint8*& aPtr);
        static TInt16 ReadInt16Inc(const TUint8*& aPtr);
        static TInt16 ReadBigEndianInt16Inc(const TUint8*& aPtr);
        static TUint16 ReadUint16Inc(const TUint8*& aPtr);
        static TUint16 ReadBigEndianUint16Inc(const TUint8*& aPtr);
        static TInt32 ReadInt32Inc(const TUint8*& aPtr);
        static TInt32 ReadBigEndianInt32Inc(const TUint8*& aPtr);
        static TUint32 ReadUint32Inc(const TUint8*& aPtr);
        static TUint32 ReadBigEndianUint32Inc(const TUint8*& aPtr);
        };

inline TUint8 PtrReadUtil::ReadUint8(const TUint8* aPtr)
        {
        return *aPtr ;
        }

inline TInt8 PtrReadUtil::ReadInt8(const TUint8* aPtr)
        {
        return TInt8(ReadUint8(aPtr));
        }

inline TUint16 PtrReadUtil::ReadUint16(const TUint8* aPtr)
        {
        return TUint16(aPtr[0] | (aPtr[1]<<8));
        }

inline TInt16 PtrReadUtil::ReadInt16(const TUint8* aPtr)
        {
        return TInt16(ReadUint16(aPtr));
        }

inline TUint32 PtrReadUtil::ReadUint32(const TUint8* aPtr)
        {
        return TUint32(aPtr[0] | (aPtr[1]<<8) | (aPtr[2]<<16) | (aPtr[3]<<24));
        }

inline TInt32 PtrReadUtil::ReadInt32(const TUint8* aPtr)
        {
        return TInt32(ReadUint32(aPtr));
        }

inline TUint16 PtrReadUtil::ReadBigEndianUint16(const TUint8* aPtr)
        {
        return TUint16((aPtr[0]<<8) | aPtr[1]);
        }

inline TInt16 PtrReadUtil::ReadBigEndianInt16(const TUint8* aPtr)
        {
        return TInt16(ReadBigEndianInt16(aPtr));
        }

inline TUint32 PtrReadUtil::ReadBigEndianUint32(const TUint8* aPtr)
        {
        return TUint32((aPtr[0]<<24) | (aPtr[1]<<16) | (aPtr[2]<<8) | aPtr[3]);
        }

inline TInt32 PtrReadUtil::ReadBigEndianInt32(const TUint8* aPtr)
        {
        return TInt32(ReadBigEndianInt32(aPtr));
        }

inline TInt8 PtrReadUtil::ReadInt8Inc(const TUint8*& aPtr)
        {
        TInt8 result = ReadInt8(aPtr);
        aPtr += 1;
        return result;
        }

inline TUint8 PtrReadUtil::ReadUint8Inc(const TUint8*& aPtr)
        {
        TUint8 result = ReadUint8(aPtr);
        aPtr += 1;
        return result;
        }

inline TInt16 PtrReadUtil::ReadInt16Inc(const TUint8*& aPtr)
        {
        TInt16 result = ReadInt16(aPtr);
        aPtr += 2;
        return result;
        }

inline TUint16 PtrReadUtil::ReadUint16Inc(const TUint8*& aPtr)
        {
        TUint16 result = ReadUint16(aPtr);
        aPtr += 2;
        return result;
        }

inline TInt16 PtrReadUtil::ReadBigEndianInt16Inc(const TUint8*& aPtr)
        {
        TInt16 result = ReadBigEndianInt16(aPtr);
        aPtr += 2;
        return result;
        }

inline TUint16 PtrReadUtil::ReadBigEndianUint16Inc(const TUint8*& aPtr)
        {
        TUint16 result = ReadBigEndianUint16(aPtr);
        aPtr += 2;
        return result;
        }

inline TInt32 PtrReadUtil::ReadInt32Inc(const TUint8*& aPtr)
        {
        TInt32 result = ReadInt32(aPtr);
        aPtr += 4;
        return result;
        }

inline TUint32 PtrReadUtil::ReadUint32Inc(const TUint8*& aPtr)
        {
        TUint32 result = ReadUint32(aPtr);
        aPtr += 4;
        return result;
        }

inline TInt32 PtrReadUtil::ReadBigEndianInt32Inc(const TUint8*& aPtr)
        {
        TInt32 result = ReadBigEndianInt32(aPtr);
        aPtr += 4;
        return result;
        }

inline TUint32 PtrReadUtil::ReadBigEndianUint32Inc(const TUint8*& aPtr)
        {
        TUint32 result = ReadBigEndianUint32(aPtr);
        aPtr += 4;
        return result;
        }

class PtrWriteUtil
        {
public:
        static void WriteInt8(TUint8* aPtr, TInt aData);
        static void WriteInt16(TUint8* aPtr, TInt aData);
        static void WriteInt32(TUint8* aPtr, TInt aData);
        // Big endian version
        static void WriteBigEndianInt32(TUint8* aPtr, TInt32 aData);
        };

inline void PtrWriteUtil::WriteInt8(TUint8* aPtr, TInt aData)
        {
        aPtr[0] = TUint8(aData);
        }

inline void PtrWriteUtil::WriteInt16(TUint8* aPtr, TInt aData)
        {
        aPtr[0] = TUint8(aData);
        aPtr[1] = TUint8(aData>>8);
        }

inline void PtrWriteUtil::WriteInt32(TUint8* aPtr, TInt aData)
        {
        aPtr[0] = TUint8(aData);
        aPtr[1] = TUint8(aData>>8);
        aPtr[2] = TUint8(aData>>16);
        aPtr[3] = TUint8(aData>>24);
        }

inline void PtrWriteUtil::WriteBigEndianInt32(TUint8* aPtr, TInt32 aData)
        {
        aPtr[0] = TUint8(aData>>24);
        aPtr[1] = TUint8(aData>>16);
        aPtr[2] = TUint8(aData>>8);
        aPtr[3] = TUint8(aData);
        }

#endif // __ImageUtils_h

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