MRF: Allow open of MRF-in-TAR as MRF #10331
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What does this PR do?
Allow the use of a tar file containing a single MRF directly as an MRF.
It has always been possible to open an MRF (as any other gdal format) inside a tar file by using a vsitar path.
This change allows a tar file that starts with the MRF metadata file to be directly recognized and opened for reading without having to use the vsitar path. This makes an MRF inside a TAR file act as a single file raster format, making it easier to share. All the MRF files have to be inside the tar, with the main metadata (.mrf) being the first.
The identification of such an MRF-in-TAR candidate is done by directly inspecting the tar header and the beginning of the first file inside the tar, without invoking using /vsitar.
This change does not interfere with the use of any other file inside the tar using the normal /vsitar path. The only difference is that gdalinfo on such a mrf-in-tar file will return the MRF information, as opposed to listing the tar content as it does now.
The last file extension has to be .tar to be correctly opened by vsitar internally, the recommended file name for an MRF-in-TAR will be filename.mrf.tar