cosv/source/storage/mbstream.cxx

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  30
  31 #include <precomp.h>
  32 #include <cosv/mbstream.hxx>
  33
  34 // NOT FULLY DECLARED SERVICES
  35 #include <string.h>
  36
  37
  38 namespace csv
  39 {
  40
  41
  42
  43 mbstream::mbstream( uintt i_nSize )
  44     :   dpOwnedMemorySpace( new char[i_nSize+1] ),
  45         nSize( i_nSize ),
  46         nCurPosition( 0 )
  47 {
  48     dpOwnedMemorySpace[i_nSize] = '\0';
  49 }
  50
  51 mbstream::~mbstream()
  52 {
  53     delete [] dpOwnedMemorySpace;
  54 }
  55
  56 void
  57 mbstream::resize( uintt  i_nSize )
  58 {
  59     DYN char * pNew = new char[i_nSize];
  60     memcpy( pNew, dpOwnedMemorySpace, min(i_nSize,nSize) );
  61     delete [] dpOwnedMemorySpace;
  62     dpOwnedMemorySpace = pNew;
  63     nSize = i_nSize;
  64 }
  65
  66 uintt
  67 mbstream::do_read( void *              out_pDest,
  68                    uintt           i_nNrofBytes )
  69 {
  70     uintt  ret = min( i_nNrofBytes, nSize - nCurPosition );
  71     memcpy( out_pDest, dpOwnedMemorySpace, ret );
  72     nCurPosition += ret;
  73     return ret;
  74 }
  75
  76 bool
  77 mbstream::inq_eod() const
  78 {
  79      return nCurPosition == nSize;
  80 }
  81
  82 uintt
  83 mbstream::do_write( const void *        i_pSrc,
  84                     uintt           i_nNrofBytes )
  85 {
  86     resize( max( 3 * (nSize+1) / 2, nCurPosition + i_nNrofBytes) );
  87     memcpy( dpOwnedMemorySpace+nCurPosition, i_pSrc, i_nNrofBytes );
  88     nCurPosition += i_nNrofBytes;
  89     return i_nNrofBytes;
  90 }
  91
  92 uintt
  93 mbstream::do_seek( intt         i_nDistance,
  94                    seek_dir i_eStartPoint )
  95 {
  96     switch ( i_eStartPoint )
  97     {
  98          case beg:       if ( uintt(i_nDistance) < nSize )
  99                             nCurPosition = uintt(i_nDistance);
 100                         break;
 101          case cur:       if ( i_nDistance < 0
 102                                 ?   uintt(-i_nDistance) <= nCurPosition
 103                                 :   uintt(i_nDistance) + nCurPosition < nSize )
 104                             nCurPosition = uintt( intt(nCurPosition) + i_nDistance );
 105                         break;
 106          case end:       if ( i_nDistance < 0
 107                              AND uintt(-i_nDistance) < nSize - 1 )
 108                             nCurPosition = uintt( intt(nSize) - 1 + i_nDistance );
 109                         break;
 110     }
 111     return position();
 112 }
 113
 114 uintt
 115 mbstream::inq_position() const
 116 {
 117     return nCurPosition;
 118 }
 119
 120
 121 }   // namespace csv
 122