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Copy pathTiffStreamAdaptor.cpp
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99 lines (82 loc) · 2.29 KB
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#include <ossim/support_data/TiffStreamAdaptor.h>
tsize_t ossim::TiffIStreamAdaptor::tiffRead(thandle_t st,tdata_t buffer,tsize_t size)
{
TiffIStreamAdaptor* streamAdaptor = static_cast<TiffIStreamAdaptor*>(st);
tsize_t result = -1;
std::shared_ptr<ossim::istream> is = streamAdaptor->getStream();
if(is)
{
if(!is->good()) is->clear();
is->read((char*)buffer, size);
result = is->gcount();
}
return result;
};
tsize_t ossim::TiffIStreamAdaptor::tiffWrite(thandle_t st, tdata_t buffer,tsize_t size)
{
return -1;
};
int ossim::TiffIStreamAdaptor::tiffClose(thandle_t st)
{
TiffIStreamAdaptor* streamAdaptor = static_cast<TiffIStreamAdaptor*>(st);
streamAdaptor->close();
return 0;
};
toff_t ossim::TiffIStreamAdaptor::tiffSeek(thandle_t st,toff_t pos, int whence)
{
TiffIStreamAdaptor* streamAdaptor = static_cast<TiffIStreamAdaptor*>(st);
toff_t result = -1;
std::ios_base::seekdir seekDir = std::ios::beg;
std::shared_ptr<ossim::istream> is = streamAdaptor->getStream();
if(is)
{
// Because we are adapting, on each seek we need to clear our previous error so
// we can continue on. Do not want the stream to stay in a failed state.
//
if(!is->good()) is->clear();
switch(whence)
{
case 0: // SEEK_SET
{
seekDir = std::ios::beg;
break;
}
case 1: // SEEK_CUR
{
seekDir = std::ios::cur;
break;
}
case 2: // SEEK_END
{
seekDir = std::ios::end;
break;
}
}
is->seekg(pos, seekDir);
result = is->tellg();
}
return result;
};
toff_t ossim::TiffIStreamAdaptor::tiffSize(thandle_t st)
{
toff_t result = -1;
TiffIStreamAdaptor* streamAdaptor = static_cast<TiffIStreamAdaptor*>(st);
std::shared_ptr<ossim::istream> is = streamAdaptor->getStream();
if (is)
{
if(!is->good()) is->clear();
ossim_int64 currentOffset = is->tellg();
is->seekg(0, std::ios::end);
result = is->tellg();
is->seekg(currentOffset);
}
return result;
};
int ossim::TiffIStreamAdaptor::tiffMap(thandle_t, tdata_t*, toff_t*)
{
return 0;
};
void ossim::TiffIStreamAdaptor::tiffUnmap(thandle_t, tdata_t, toff_t)
{
return;
};