[Gdal-dev] gdal with ECW JPEG 2000 SDK v3.1

Tom Lynch tflynch at gmail.com
Mon Mar 21 00:18:49 EST 2005

On Thu, 17 Mar 2005 09:38:28 -0500, Frank Warmerdam
<fwarmerdam at gmail.com> wrote:
> Tom - what does this do?  Is SetKeySize() needed to *read* >large
> ECW files?

The call just zeros a mask value that is used in a conditional check
when a destination file is opened for write.  The call must be made
each time a compression occurs as the mask is reset during
initialisation of the compression.

The call exists to protect developers from inadvertently going outside
the licensing agreements on the compression side.

Just to clarify, the call only affects compression operations and
should never introduce a restriction on the allowable file size for
reading (which is practically unlimited under all license agreements
in any case).

Tom Lynch
Development, ER Mapper
Phone:      +61 8 93882900
Fax:        +61 8 93882901
Email:      tom.lynch at ermapper.com
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