Re: Calculate hash for a *very* large file

You mean like this stream file
'/QSYS.LIB/MYLIB.LIB/MYTABLE.FILE/PARTITION.MBR'?

Rob Berendt
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From:
Dan <dan27649@xxxxxxxxx>
To:
RPG400-L@xxxxxxxxxxxx
Date:
06/18/2009 02:42 PM
Subject:
Calculate hash for a *very* large file
Sent by:
rpg400-l-bounces@xxxxxxxxxxxx



Problem: We FTP files from the i to a Windows server. On a few
occasions,
we have had corruption even though FTP reports the transfer completed
successfully. The largest of these files have a record length of 2000
bytes, and have record counts approaching 3 million on some days.

Determining that corruption occurred often happens weeks later, after the
original source data is removed from the i.

The current thinking around here is to use a hash code. We already found
a
few tools that can create a hash on the file that sits on the Windows
server. However, when I searched in the midrange.com archives, I found
several references to the QC3CALHA API. Unfortunately, it appears to be
limited to a data length that can be defined in Binary(4). I presume that
the data length would be the product of the record length and number of
records in the file.

I found another link in the archive that provided source code for an
application and that appears to use a stream file as input:
http://archive.midrange.com/rpg400-l/200303/msg00008.html
It's been too many years, but can a native library/file object name be
specified as a stream file?

Any advice would be greatly appreciated!
- Dan
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