package/source/zipapi/MemoryByteGrabber.hxx

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  30 #ifndef _MEMORY_BYTE_GRABBER_HXX_
  31 #define _MEMORY_BYTE_GRABBER_HXX_
  32
  33 #include <com/sun/star/io/XInputStream.hpp>
  34 #include <com/sun/star/io/XSeekable.hpp>
  35 #include <string.h>
  36
  37 class MemoryByteGrabber
  38 {
  39 protected:
  40     const com::sun::star::uno::Sequence < sal_Int8 > maBuffer;
  41     const sal_Int8 *mpBuffer;
  42     sal_Int32 mnCurrent, mnEnd;
  43 public:
  44     MemoryByteGrabber ( const com::sun::star::uno::Sequence < sal_Int8 > & rBuffer )
  45     : maBuffer ( rBuffer )
  46     , mpBuffer ( rBuffer.getConstArray() )
  47     , mnCurrent ( 0 )
  48     , mnEnd ( rBuffer.getLength() )
  49     {
  50     }
  51     MemoryByteGrabber()
  52     {
  53     }
  54     const sal_Int8 * getCurrentPos () { return mpBuffer + mnCurrent; }
  55
  56     // XInputStream chained
  57     sal_Int32 SAL_CALL readBytes( com::sun::star::uno::Sequence< sal_Int8 >& aData,
  58                                             sal_Int32 nBytesToRead )
  59         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  60     {
  61         if ( nBytesToRead < 0)
  62             throw com::sun::star::io::BufferSizeExceededException();
  63
  64         if (nBytesToRead + mnCurrent > mnEnd)
  65             nBytesToRead = mnEnd - mnCurrent;
  66
  67         aData.realloc ( nBytesToRead );
  68         memcpy ( aData.getArray(), mpBuffer + mnCurrent, nBytesToRead );
  69         mnCurrent += nBytesToRead;
  70         return nBytesToRead;
  71     }
  72
  73     sal_Int32 SAL_CALL readSomeBytes( com::sun::star::uno::Sequence< sal_Int8 >& aData,
  74                                                     sal_Int32 nMaxBytesToRead )
  75         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  76     {
  77         return readBytes( aData, nMaxBytesToRead );
  78     }
  79     void SAL_CALL skipBytes( sal_Int32 nBytesToSkip )
  80         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  81     {
  82         mnCurrent += nBytesToSkip;
  83     }
  84     sal_Int32 SAL_CALL available(  )
  85         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  86     {
  87         return mnEnd - mnCurrent;
  88     }
  89     void SAL_CALL closeInput(  )
  90         throw(com::sun::star::io::NotConnectedException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  91     {
  92     }
  93
  94     // XSeekable chained...
  95     sal_Int64 SAL_CALL seek( sal_Int64 location )
  96         throw(com::sun::star::lang::IllegalArgumentException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
  97     {
  98         if ( location < 0 || location > mnEnd )
  99             throw com::sun::star::lang::IllegalArgumentException ();
 100         mnCurrent = static_cast < sal_Int32 > ( location );
 101         return mnCurrent;
 102     }
 103     sal_Int64 SAL_CALL getPosition(  )
 104             throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
 105     {
 106         return mnCurrent;
 107     }
 108     sal_Int64 SAL_CALL getLength(  )
 109             throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
 110     {
 111         return mnEnd;
 112     }
 113     MemoryByteGrabber& operator >> (sal_Int8& rInt8)
 114     {
 115         if (mnCurrent + 1 > mnEnd )
 116             rInt8 = 0;
 117         else
 118             rInt8 = mpBuffer [mnCurrent++] & 0xFF;
 119         return *this;
 120     }
 121     MemoryByteGrabber& operator >> (sal_Int16& rInt16)
 122     {
 123         if (mnCurrent + 2 > mnEnd )
 124             rInt16 = 0;
 125         else
 126         {
 127             rInt16  =   mpBuffer[mnCurrent++] & 0xFF;
 128             rInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
 129         }
 130         return *this;
 131     }
 132     MemoryByteGrabber& operator >> (sal_Int32& rInt32)
 133     {
 134         if (mnCurrent + 4 > mnEnd )
 135             rInt32 = 0;
 136         else
 137         {
 138             rInt32  =   mpBuffer[mnCurrent++] & 0xFF;
 139             rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
 140             rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
 141             rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
 142         }
 143         return *this;
 144     }
 145
 146     MemoryByteGrabber& operator >> (sal_uInt8& rInt8)
 147     {
 148         if (mnCurrent + 1 > mnEnd )
 149             rInt8 = 0;
 150         else
 151             rInt8 = mpBuffer [mnCurrent++] & 0xFF;
 152         return *this;
 153     }
 154     MemoryByteGrabber& operator >> (sal_uInt16& rInt16)
 155     {
 156         if (mnCurrent + 2 > mnEnd )
 157             rInt16 = 0;
 158         else
 159         {
 160             rInt16  =   mpBuffer [mnCurrent++] & 0xFF;
 161             rInt16 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
 162         }
 163         return *this;
 164     }
 165     MemoryByteGrabber& operator >> (sal_uInt32& rInt32)
 166     {
 167         if (mnCurrent + 4 > mnEnd )
 168             rInt32 = 0;
 169         else
 170         {
 171             rInt32  =   mpBuffer [mnCurrent++] & 0xFF;
 172             rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
 173             rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
 174             rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
 175         }
 176         return *this;
 177     }
 178 };
 179
 180 #endif