RUN-LENTH CODING
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Compilation instructions:
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No special instructions.  Compile rle.c and drle.c for
an encoder, and decoder, respectively.
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The encoder is a very basic run-length encoder that encodes repetitive sequences
by printing a control character, -- #defined to be ASCII number 0 -- the 
character to print, followed by the number of times to print it.  A non
character ASCII code is used as the control character to avoid instances where 
the control character appears in the input, which would seriously confuse the 
decoder.  For this reason, the encoder will only function properly on inputs 
which are ASCII text files, which is rather amusing, since normal text files 
will hardly be compressed at all due to their lack of repeating sequences.  The
encoder only encodes sequences of 4 or more characters. Since a code requires 
3 bytes, encoding sequences shorter than 4 would either result in no net 
reduction, or an increase in file size.