[gdal-dev] ECRG RasterIO problem

[mchapman at hyperacktive.com]

All,

 

I have an ECRG dataset that fails when reading pixels from the
gdalrasterband object on one of the subdatasets.  It appears that the
underlying proxy dataset has a macro check called
RB_PROXY_METHOD_WITH_RET_WITH_INIT_BLOCK that fails because the block sizes
are different.  This happens for all the ECRG subdatasets that I read from,
in other words it's not just specific to a single dataset.  FYI, the same
code works fine for RPFTOC datasets and all other GDAL formats.  I am using
GDAL version 3.4.2.
 
// code snippet from gdalproxydataset.cpp line 247
else if( nSrcBlockXSize != nBlockXSize || nSrcBlockYSize != nBlockYSize) \
{ \
        CPLError(CE_Failure, CPLE_AppDefined, "Inconsistent block dimensions
between proxy and source"); \
        ret = CE_Failure; \
} \
 
The variables nBlockXSize and nBlockYSize are (2304, 1) and nSrcBlockXSize
and nSrcBlockYSize are {128, 128).
 
I think this is because the ECRG frame size is 2304 x 2304 but the block
size of the frame file is 128 x 128.
 
Does anybody know what my problem might be or is this an error in the driver
code?
 
Best regards,
Martin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20221003/a36eceb1/attachment.htm>