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From Brian Pontarelli <>
Subject [Fileupload] Missing character in the middle of a file
Date Mon, 04 Oct 2010 15:43:18 GMT
I'm using the FileUpload library and running into a very odd issue that I can't seem to track
down. I stepped through some of the FileUpload code and had to abandon that for a while as
it looked like it would take a considerable amount of time to figure it out that way.

Here's what I'm doing. I've written a Mock request that I'm using for unit tests. It provides
a Mock input stream that contains the multipart data. The code for most of this hand written,
but I got it mostly from HTTP Client. 

I have a unit test that exercises my mock input stream and the FileUpload library. One of
the tests uploads a simple 6 byte text file and a single form field. This tests passes. I
have a more complex test that uploads a JAR file and a form field and it fails.

I figured that the original File and the File written out by the FileUpload would have different
bytes at the start or end and it was my mock input stream that was causing the issue. To test
this theory I opened both files in a HEX editor. What I found was that the files differ by
one a single byte and that byte is at position 305. The other interesting thing I found was
that the byte that exists in the original and is missing from the FileUpload file is 'FF'.

Anyone run into this type of issue before or have suggestions for places to start looking?


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