ftruncate() and stream wrappers

[Justin Hannus <jhannus@xxxxxxxxx>]

I dont see support for using ftruncate() on user defined stream 
wrappers. When I try to truncate one I get an E_WARNING:

Warning: ftruncate() [function.ftruncate]: Can't truncate this stream!

Does anyone know of a way to truncate a user defined stream wrapper 
using php's file system or stream functions?

-justin

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