Re: [gdal-dev] bit length overflow in deflate compress

[Ivan Lucena]

Even,

I comment the DEBUG line on my nmake.local and I recompiled GDAL and the messages are gone.

Thanks.

>  -------Original Message-------
>  From: Even Rouault <even.rouault at mines-paris.org>
>  To: gdal-dev at lists.osgeo.org, Ivan Lucena <ivan.lucena at pmldnet.com>
>  Subject: Re: [gdal-dev] bit length overflow in deflate compress
>  Sent: Dec 29 '11 14:28
>  
>  Le jeudi 29 décembre 2011 20:15:32, Ivan Lucena a écrit :
>  > Hi there,
>  >
>  > I am getting a lot of messages like that when using deflate compression
>  > (zlib):
>  >
>  > $ gdal_translate input.tif output.tif -co compress=deflate
>  > Input file size is 800, 600
>  > 0...10...20...30...40...50...60...70...80...90...100 - done.
>  >
>  > bit length overflow
>  > code 4 bits 5->6
>  >
>  > bit length overflow
>  > code 16 bits 6->7
>  >
>  > bit length overflow
>  > code 11 bits 6->7
>  >
>  > bit length overflow
>  > code 5 bits 6->7
>  > code 11 bits 6->7
>  >
>  > bit length overflow
>  > code 3 bits 6->7
>  >
>  > bit length overflow
>  > code 5 bits 5->6
>  >
>  > bit length overflow
>  > code 5 bits 6->7
>  > code 12 bits 6->7
>  >
>  > bit length overflow
>  > code 11 bits 6->7
>  >
>  > bit length overflow
>  > code 12 bits 6->7
>  >
>  > bit length overflow
>  > code 16 bits 6->7
>  >
>  > The input and output image has the same checksum at the end, so what is
>  > going on?
>  
>  Ivan, I suppose you are using GDAL internal zlib. This error message comes
>  from frmts/zlib/trees.c, and it appears it is only a debug message that is
>  output if DEBUG is #define 'd (see zutil.h). On a non-debug build, the message
>  shouldn't appear.
>  
>  >
>  > The image is RGB, GDAL is compiled for 32bits running in a win64 machine.
>  >
>  > Regards,
>  >
>  > Ivan
>  >
>  >
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