Re: Odd IFS reading issue

[Paul Tuohy <tuohyp@xxxxxxxxxxxxxxxxx>]

Hi Aaron,

Isn't the 1024th byte 90?

Regards

Paul Tuohy
ComCon
www.comconadvisor.com 
www.systemideveloper.com 





Aaron Bartell wrote:
>    I have an IFS file reading issue that I can't quite figure out.  The
>    general idea is that I want to incorporate a process of streaming an IFS
>    file from one place to the next in chunks of 1024 vs. reading it with a
>    single call to read() after first allocating space based on the file size.
>
>    The scenario is as follows:  I have a file named small.jpg in the IFS that
>    is 1067 bytes in size.  When I read in 1024 bytes the 1024th byte is
>    different than when I read in all 1067 bytes at a time.  The 1024th byte
>    when I read 1024 at a time is x'AF' (which appears as the Registered
>    symbol) and the 1024th byte when I read in the entire file of 1067 bytes
>    is x'94' (a lower case letter m).  Crazy eh?
>
>    Here are some screen shots of the memory differences (highlighted) in
>    WDSC's Memory view:
>    [1]http://mowyourlawn.com/temp/readbyteissue_dataptr1.png
>    [2]http://mowyourlawn.com/temp/readbyteissue_dataptr2.png
>
>    Here is the concise program I put together to test the issue:
>    [3]http://mowyourlawn.com/temp/READBYTE.RPGLE
>
>    Here is the small.jpg file I am using in the test.
>    [4]http://mowyourlawn.com/temp/small.jpg
>
>    Anybody have any ideas of what might be going on?  Am I missing something
>    stupid?
>
>    Aaron Bartell
>    [5]http://mowyourlawn.com
>
> References
>
>    Visible links
>    1. http://mowyourlawn.com/temp/readbyteissue_dataptr1.png
>    2. http://mowyourlawn.com/temp/readbyteissue_dataptr2.png
>    3. http://mowyourlawn.com/temp/READBYTE.RPGLE
>    4. http://mowyourlawn.com/temp/small.jpg
>    5. http://mowyourlawn.com/
>