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OP here. Looks like the MyTelnet->_fillbuf function is never actually called, due to some inheritance problem.
Darned if I can see why inheritance doesn't work as expected:
#!/usr/bin/perl -- my $connectObj = MyTelnet->new(); $connectObj->open( Host => 'iberiamud.mooo.com', Port => 5900, ); while (1) {} # Poor man's main loop { package MyTelnet; use base ("Net::Telnet"); sub _fillbuf { print "This function is never called\n"; print "Base class's ->_fillbuf function is called instead\n"; } }
Regarding the call to inflate. My production code (which probably has no inheritance problems, as it generates billions of debug messages that actually appear) was producing:
Error: No output status: data error msg: incorrect header check
I tried ignoring everything before the first ASCII 120 character, which is where the zlib stream is supposed to start. The first couple of calls to Compress::Zlib->inflate then succeed. After that, we're back to square one, with new error messages:
Error: No output status: data error msg: invalid code lengths set
The zlib docs suggest this kind of error appears if the compressed stream is corrupted, but I haven't yet found anything in Net::Telnet that might be responsible.