CExternalChannel::CExternalChannel( PCIDSKBuffer &image_header,
uint64 ih_offset,
PCIDSKBuffer &file_header,
std::string filename,
int channelnum,
CPCIDSKFile *file,
eChanType pixel_type )
: CPCIDSKChannel( image_header, ih_offset, file, pixel_type, channelnum)
{
db = NULL;
mutex = NULL;
/* -------------------------------------------------------------------- */
/* Establish the data window. */
/* -------------------------------------------------------------------- */
exoff = atoi(image_header.Get( 250, 8 ));
eyoff = atoi(image_header.Get( 258, 8 ));
exsize = atoi(image_header.Get( 266, 8 ));
eysize = atoi(image_header.Get( 274, 8 ));
echannel = atoi(image_header.Get( 282, 8 ));
if (echannel == 0) {
echannel = channelnum;
}
/* -------------------------------------------------------------------- */
/* Establish the file we will be accessing. */
/* -------------------------------------------------------------------- */
if( filename != "" )
this->filename = filename;
else
image_header.Get(64,64,this->filename);
}
void CPCIDSKChannel::LoadHistory( const PCIDSKBuffer &image_header )
{
// Read the history from the image header. PCIDSK supports
// 8 history entries per channel.
std::string hist_msg;
history_.clear();
for (unsigned int i = 0; i < 8; i++)
{
image_header.Get(384 + i * 80, 80, hist_msg);
// Some programs seem to push history records with a trailing '\0'
// so do some extra processing to cleanup. FUN records on segment
// 3 of eltoro.pix are an example of this.
size_t size = hist_msg.size();
while( size > 0
&& (hist_msg[size-1] == ' ' || hist_msg[size-1] == '\0') )
size--;
hist_msg.resize(size);
history_.push_back(hist_msg);
}
}
CBandInterleavedChannel::CBandInterleavedChannel( PCIDSKBuffer &image_header,
uint64 ih_offsetIn,
CPL_UNUSED PCIDSKBuffer &file_header,
int channelnum,
CPCIDSKFile *fileIn,
uint64 image_offset,
eChanType pixel_typeIn )
: CPCIDSKChannel( image_header, ih_offsetIn, fileIn, pixel_typeIn, channelnum)
{
io_handle_p = NULL;
io_mutex_p = NULL;
/* -------------------------------------------------------------------- */
/* Establish the data layout. */
/* -------------------------------------------------------------------- */
if( strcmp(file->GetInterleaving().c_str(),"FILE") == 0 )
{
start_byte = atouint64(image_header.Get( 168, 16 ));
pixel_offset = atouint64(image_header.Get( 184, 8 ));
line_offset = atouint64(image_header.Get( 192, 8 ));
}
else
{
start_byte = image_offset;
pixel_offset = DataTypeSize(pixel_type);
line_offset = pixel_offset * width;
}
/* -------------------------------------------------------------------- */
/* Establish the file we will be accessing. */
/* -------------------------------------------------------------------- */
image_header.Get(64,64,filename);
filename = MassageLink( filename );
if( filename.length() == 0 )
file->GetIODetails( &io_handle_p, &io_mutex_p );
else
filename = MergeRelativePath( file->GetInterfaces()->io,
file->GetFilename(),
filename );
}