cosv/source/storage/mbstream.cxx

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  27
  28 #include <precomp.h>
  29 #include <cosv/mbstream.hxx>
  30
  31 // NOT FULLY DECLARED SERVICES
  32 #include <string.h>
  33
  34
  35 namespace csv
  36 {
  37
  38
  39
  40 mbstream::mbstream( uintt i_nSize )
  41     :   dpOwnedMemorySpace( new char[i_nSize+1] ),
  42         nSize( i_nSize ),
  43         nCurPosition( 0 )
  44 {
  45     dpOwnedMemorySpace[i_nSize] = '\0';
  46 }
  47
  48 mbstream::~mbstream()
  49 {
  50     delete [] dpOwnedMemorySpace;
  51 }
  52
  53 void
  54 mbstream::resize( uintt  i_nSize )
  55 {
  56     DYN char * pNew = new char[i_nSize];
  57     memcpy( pNew, dpOwnedMemorySpace, min(i_nSize,nSize) );
  58     delete [] dpOwnedMemorySpace;
  59     dpOwnedMemorySpace = pNew;
  60     nSize = i_nSize;
  61 }
  62
  63 uintt
  64 mbstream::do_read( void *          out_pDest,
  65                    uintt           i_nNrofBytes )
  66 {
  67     uintt  ret = min( i_nNrofBytes, nSize - nCurPosition );
  68     memcpy( out_pDest, dpOwnedMemorySpace, ret );
  69     nCurPosition += ret;
  70     return ret;
  71 }
  72
  73 bool
  74 mbstream::inq_eod() const
  75 {
  76      return nCurPosition == nSize;
  77 }
  78
  79 uintt
  80 mbstream::do_write( const void *    i_pSrc,
  81                     uintt           i_nNrofBytes )
  82 {
  83     resize( max( 3 * (nSize+1) / 2, nCurPosition + i_nNrofBytes) );
  84     memcpy( dpOwnedMemorySpace+nCurPosition, i_pSrc, i_nNrofBytes );
  85     nCurPosition += i_nNrofBytes;
  86     return i_nNrofBytes;
  87 }
  88
  89 uintt
  90 mbstream::do_seek( intt     i_nDistance,
  91                    seek_dir i_eStartPoint )
  92 {
  93     switch ( i_eStartPoint )
  94     {
  95          case beg:       if ( uintt(i_nDistance) < nSize )
  96                             nCurPosition = uintt(i_nDistance);
  97                         break;
  98          case cur:       if ( i_nDistance < 0
  99                                 ?   uintt(-i_nDistance) <= nCurPosition
 100                                 :   uintt(i_nDistance) + nCurPosition < nSize )
 101                             nCurPosition = uintt( intt(nCurPosition) + i_nDistance );
 102                         break;
 103          case end:       if ( i_nDistance < 0
 104                              AND uintt(-i_nDistance) < nSize - 1 )
 105                             nCurPosition = uintt( intt(nSize) - 1 + i_nDistance );
 106                         break;
 107     }
 108     return position();
 109 }
 110
 111 uintt
 112 mbstream::inq_position() const
 113 {
 114     return nCurPosition;
 115 }
 116
 117
 118 }   // namespace csv
 119