klimitediodevice.h
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00019 #ifndef klimitediodevice_h
00020 #define klimitediodevice_h
00021
00029 class KLimitedIODevice : public QIODevice
00030 {
00031 public:
00039 KLimitedIODevice( QIODevice *dev, int start, int length )
00040 : m_dev( dev ), m_start( start ), m_length( length )
00041 {
00042
00043 setType( IO_Direct );
00044 open( IO_ReadOnly );
00045 }
00046 virtual ~KLimitedIODevice() {}
00047
00048 virtual bool open( int m ) {
00049
00050 if ( m & IO_ReadOnly ) {
00051
00052
00053
00054
00055
00056
00057 m_dev->at( m_start );
00058 }
00059 else
00060 kdWarning(7005) << "KLimitedIODevice::open only supports IO_ReadOnly!" << endl;
00061 setState( IO_Open );
00062 setMode( m );
00063 return true;
00064 }
00065 virtual void close() {}
00066 virtual void flush() {}
00067
00068 virtual Offset size() const { return m_length; }
00069
00070 virtual Q_LONG readBlock ( char * data, Q_ULONG maxlen )
00071 {
00072 maxlen = QMIN( maxlen, m_length - at() );
00073 return m_dev->readBlock( data, maxlen );
00074 }
00075 virtual Q_LONG writeBlock ( const char *, Q_ULONG ) { return -1; }
00076 virtual int putch( int ) { return -1; }
00077
00078 virtual int getch() {
00079 char c[2];
00080 if ( readBlock(c, 1) == -1)
00081 return -1;
00082 else
00083 return c[0];
00084 }
00085 virtual int ungetch( int c ) { return m_dev->ungetch(c); }
00086 virtual Offset at() const { return m_dev->at() - m_start; }
00087 virtual bool at( Offset pos ) {
00088 Q_ASSERT( pos <= m_length );
00089 pos = QMIN( pos, m_length );
00090 return m_dev->at( m_start + pos );
00091 }
00092 virtual bool atEnd() const { return m_dev->at() >= m_start + m_length; }
00093 private:
00094 QIODevice* m_dev;
00095 Q_ULONG m_start;
00096 Q_ULONG m_length;
00097 };
00098
00099 #endif
This file is part of the documentation for kio Library Version 3.2.3.