[gdal-dev] Under what (if any) conditions would GDALWriteBlock modify data buffer?

[Fitch, Simeon]

The last argument to function `CPLErr GDALWriteBlock(GDALRasterBandH, int,
int, void*)`, pointing to the block array, is not `const`.  I can't find
anything in the documentation discussing ownership, etc. but need to know
what kind of invariants can be assumed here.

Are there (driver dependent?) circumstances where `GDALWriteBlock` will
mutate the given array, or can callers assume it's effectively `const
void*`?

Thanks,

Simeon

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