RE: [Openexr-devel] tellg() throws an exception on large files:OpenEXR V1.4.0a - VS2005

[Nick Porcino]

For files under the limit size, is there a performance difference
between your new implementation, and the existing implementation?

-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of Michael Wolf
Sent: Tuesday, May 29, 2007 11:50 AM
To: address@hidden
Subject: Re: [Openexr-devel] tellg() throws an exception on large
files:OpenEXR V1.4.0a - VS2005

On Tue, 29 May 2007 02:53:40 +0200, Michael Wolf
<address@hidden> wrote:

Not only do I talk to myself, but I keep myself up to date as well ;)

>> I've got a problem reading a large, tiled openEXR file (that I could
write perfectly - line order: RANDOM_Y).
>>
>> The exception Iex::EinvalExc is thrown after a call of
_is->seekg(3730400304) in Imf::StdIFStream::seekg().
>>
>> The size of the file is 4.058.791.693 bytes, so just below a
potential 4GB limit (which by itself would surprise me).

Solution:

I've written a custom Low-Level File-I/O using the Win32 API
(CreateFile(), ReadFile(), SetFilePointerEx() etc...).
It now works as expected reading a file beyond 2GB.
Once I've cleaned up the code I'll mail it to Florian to include if he
likes to.

If there is any interest here I'll also attach the code or provide it
for download (whatever is preferable).

Cheers,

Mike - happy now :D


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