I noticed that when using reformail to process messages with large
attachments it seems to go unreasonably slow. For a message with a ~20Mb
attachment it takes roughly 5 seconds.
After reading though the source code it seems that almost all of this
time is spent at the end of extract_headers() in reformail.C at the
'while ( Readline() );' line.
If it's simply ignoring the output, does it actually need to be read?
Simply closing standard in saves a significant amount of time. If the
message does need to be read for some reason, then changing:
while ( Readline() );
to
char buf[512];
while ( fread(buf, 512, 1, stdin) == 1 );
or some C++ equivalent decreases the execution time from about 5 seconds
to about 0.05.
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