MemoryByteGrabber.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 * This file incorporates work covered by the following license notice:
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX
#define INCLUDED_PACKAGE_SOURCE_ZIPAPI_MEMORYBYTEGRABBER_HXX
 
#include <com/sun/star/uno/Sequence.h>
 
class MemoryByteGrabber final
{
    const sal_Int8 *mpBuffer;
    sal_Int32 mnCurrent, mnEnd;
public:
    MemoryByteGrabber ( const css::uno::Sequence < sal_Int8 > & rBuffer )
    : mpBuffer ( rBuffer.getConstArray() )
    , mnCurrent ( 0 )
    , mnEnd ( rBuffer.getLength() )
    {
    }
    MemoryByteGrabber(css::uno::Sequence<sal_Int8> &&) = delete;
 
    const sal_Int8 * getCurrentPos () const { return mpBuffer + mnCurrent; }
 
    sal_Int32 remainingSize() const { return mnEnd - mnCurrent; }
 
    // XInputStream chained
 
    void skipBytes( sal_Int32 nBytesToSkip )
    {
        mnCurrent += nBytesToSkip;
    }
 
    // XSeekable chained...
    sal_Int16 ReadInt16()
    {
        if (mnCurrent + 2 > mnEnd )
            return 0;
        sal_Int16 nInt16  =   mpBuffer[mnCurrent++] & 0xFF;
        nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
        return nInt16;
    }
 
    sal_Int16 ReadUInt16()
    {
        if (mnCurrent + 2 > mnEnd )
            return 0;
        sal_uInt16 nInt16  =  mpBuffer[mnCurrent++] & 0xFF;
        nInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
        return nInt16;
    }
 
    sal_Int32 ReadInt32()
    {
        if (mnCurrent + 4 > mnEnd )
            return 0;
 
        sal_Int32 nInt32  =   mpBuffer[mnCurrent++] & 0xFF;
        nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
        nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
        nInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
        return nInt32;
    }
 
    sal_uInt32 ReadUInt32()
    {
        if (mnCurrent + 4 > mnEnd )
            return 0;
 
        sal_uInt32 nInt32  =   mpBuffer [mnCurrent++] & 0xFF;
        nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
        nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
        nInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
        return nInt32;
    }
 
    sal_uInt64 ReadUInt64()
    {
        if (mnCurrent + 8 > mnEnd)
            return 0;
 
        sal_uInt64 nInt64 = mpBuffer[mnCurrent++] & 0xFF;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 8;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 16;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 24;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 32;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 40;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 48;
        nInt64 |= static_cast<sal_Int64>(mpBuffer[mnCurrent++] & 0xFF) << 56;
        return nInt64;
    }
};
 
#endif
 
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