#2580 closed enhancement (fixed)
Read EHdr file(s) directly from a zip archive
| Reported by: | apetkov | Owned by: | Even Rouault |
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| Priority: | normal | Milestone: | 1.6.0 |
| Component: | GDAL_Raster | Version: | svn-trunk |
| Severity: | normal | Keywords: | ehdr large file api |
| Cc: |
Description
I am interested in using the functionality to read rasters directly from compressed archives (see http://www.nabble.com/Support-for-reading-GDAL-datasets-in-compressed-archives-(.gz-and-.zip)-td19152179.html).
The EHdr driver, however, is not among those that support the "large file API".
The attached patch adds support for reading via the "large file API", and advertisement for the GDAL_DCAP_VIRTUALIO capability, so EHdr files can be read directly from compressed archives.
Example:
gdalinfo /vsizip/nd050707.zip/nd050707.bil
NOTE: The "large file API" changes apply only to the reading portions of the driver. I kept the write portion of the driver unchanged.
Attachments (1)
Change History (7)
by , 16 years ago
| Attachment: | ehdr_read_from_compressed_archives.patch added |
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comment:1 by , 16 years ago
| Summary: | Read EHdr file(s) directly from a zip archive → Read EHdr file(s) directly from a zip or a gz archive |
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Replying to apetkov:
NOTE: The "large file API" changes apply only to the reading portions of the driver. I kept the write portion of the driver unchanged.
I changed the EHdr driver to use the large file API and updated the patch.
comment:2 by , 16 years ago
| Summary: | Read EHdr file(s) directly from a zip or a gz archive → Read EHdr file(s) directly from a zip archive |
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comment:3 by , 16 years ago
| Component: | default → GDAL_Raster |
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| Keywords: | ehdr large file api added |
| Owner: | changed from to |
| Status: | new → assigned |
I'll review that
comment:4 by , 16 years ago
| Resolution: | → fixed |
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| Status: | assigned → closed |
comment:5 by , 16 years ago
Just a quick note that might help someone--using absolute path to the zip archive works also, but one needs 2 slashes (ie '') after the vsizip keyword. This is on linux, not sure how that applies to Windows.
comment:6 by , 16 years ago
It was explained in the wiki (but only for /vsigzip) : http://trac.osgeo.org/gdal/wiki/UserDocs/ReadInZip
So I added a note for /vsizip too.
Feel free to contribute to the wiki.
Updated patch with complete large file API support