[PATCH] S57: fix S57Reader::ApplyRecordUpdate()

[Even Rouault]

Saving contribution from ​http://lists.osgeo.org/pipermail/gdal-dev/2011-November/030752.html

Dear all,

Included is a patch for s57reader.cpp that properly applies updates for
certain types of charts.

The essence of this patch is that SG2D field may not be present in
original record, and must be added if update is trying to insert SG2D
fields.

The patch was made against our modified version of OGR, so line numbers
likely do not match and certain function signatures may need to be
updated. If you'd like to apply it - make sure it goes in the
S57Reader::ApplyRecordUpdate.

Best,
--
Mike

[warmerdam]

The patch has been applied in trunk (r23517). I don't have test data demonstrating it is working as expecting so I am hesitant to backport it into 1.8 branch.

[Even Rouault]

​http://lists.osgeo.org/pipermail/gdal-dev/2011-December/031138.html mentions

Test chart is found in current UKHO data set, chart GB327200 (St. Helena).
It's not a free data set, so I can't attach a copy, but UKHO should be
willing to provide one free of charge, if requested, for test purposes.