[XML-SIG] Deleting and appending of a file, without reading into memory

[gary cor]

I want to add some text onto the end of an XML file just before the closing 
tag but I don't want to read the whole file into memory as it is quite a 
large file. I am trying to do the following:

1. delete 14 characters off the end of the file (the closing tag)
2. add some new data text from a cgi script onto this
     ie - file.append(cgi_resxml)
3.  - then add back on the closing tag (14 character '</root>')
     ie - file.append('</root>')

I can manage (2.) & (3.) no problems opening the file handler with append 
access ('a'), but I can't get into to do (1.) as well... does this append 
function have a reverse function and can I use that, or should I be doing 
this a differn't way?

Kind Regards

Gary

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