[gdal-dev] VSI driver question

[Even Rouault]

Eduardo,
> 
> I have a VSI-related question. Does all file reading operations in GDAL go
> through the VSI layer for all file formats?

No, this depend on drivers. Only drivers advertizing DCAP_VIRTUALIO do. Others 
use their own I/O layer, generally because they use a underlying library that 
does not offer I/O indirection, or a few ones that have not yet been converted 
to use the VSI*L API.

Even

> Are there specific file formats
> for which this is not true? My concern is whether or not there are
> underlying file-format drivers that are third-party implementations and
> talk to the file system directly.
> 
> Thanks
> Eduardo

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