##Eskil Plugin : Compare gzip file
#
# This plugin unpacks input gzip file before comparing.
# Example file for a plugin.
# A plugin's first line must start exactly like this one.
# The text after : is the summary you can get at the command line
# A plugin must define this procedure to do the job.
# side: left or right
# chi: An input channel for reading the original file.
# cho: An output channel for writing the processed file.
proc PreProcess {side chi cho} {
zlib push gunzip $chi
chan copy $chi $cho
# Signal that the file after processing should be used both
# for comparison and for displaying.
return 1
}