GDL - GNU Data Language

Tracker: Bugs

5 point_lun and openr,/compress don't mix - ID: 2894673

Last Update: Comment added ( m_schellens )

Details:

When a file is opened with
openr, /COMPRESS, lun, file, /get_lun
then
point_lun, lun, 0L
which should rewind the file, is ineffectual, whether or not the file is
actually compressed.
On the other hand
openr, lun, file, /get_lun
point_lun, lun, 0L
works fine.

An example is enclosed.

Submitted:

Eric Hivon ( hivon ) - 2009-11-09 16:34

Priority:

Status:

Open

Resolution:

None

Assigned:

Nobody/Anonymous

Category:

None

Group:

None

Visibility:

Public

Comments ( 2 )

Date: 2009-11-13 17:58 Sender: m_schellens Although this should be fixed in the CVS, I could not restore data successfully with COMPRESS. Did it ever work for you not using POINT_LUN?
Date: 2009-11-11 13:37 Sender: slayoo Thanks for reporting it and for the testfile. Quoting authors of the gzstream wrapper the is used to implement /COMPRESS keyword (http://www.cs.unc.edu/Research/compgeom/gzstream/): ... What's Missing: - Seek. The zlib library provides the necessary functionality, but we have not realized that in the wrapper (yet? ;-)... So, that would probably be the starting point to fix it. Sylwester

Date: 2009-11-13 17:58
Sender: m_schellens

Although this should be fixed in the CVS, I could not restore data
successfully with COMPRESS.
Did it ever work for you not using POINT_LUN?

Date: 2009-11-11 13:37
Sender: slayoo

Thanks for reporting it and for the testfile.

Quoting authors of the gzstream wrapper the is used to implement /COMPRESS
keyword (http://www.cs.unc.edu/Research/compgeom/gzstream/):
... What's Missing: - Seek. The zlib library provides the necessary
functionality, but we have not realized that in the wrapper (yet? ;-)...

So, that would probably be the starting point to fix it.

Sylwester

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Attached File ( 1 )

Filename	Description	Download
test_point_lun.pro	testing point_lun with openr,/compress	Download

Change ( 1 )

Field	Old Value	Date	By
File Added	350159: test_point_lun.pro	2009-11-09 16:34	hivon

GDL - GNU Data Language

Tracker: Bugs

Comments ( 2 )

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Attached File ( 1 )

Change ( 1 )

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