compface man page on DragonFly

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COMPFACE(3)							   COMPFACE(3)

NAME
       compface, uncompface - compress and expand 48x48x1 face image files

SYNOPSIS
       compface (buf)

       uncompface (buf)

       char *buf

DESCRIPTION
       compface is a function for generating highly compressed representations
       of 48x48x1 face image files.  uncompface is an inverse  function	 which
       performs an inverse transformation with no loss of data.	 The algorithm
       used is highly tuned for its purpose and achieves better than a five to
       one  compression	 ratio	on average.  In both functions, input is via a
       NULL terminated string and a NULL terminated output string  is  written
       over  the  input	 string.   Buf should therefore point to a block of 2K
       size or more to avoid buffer overruns during output generation.

       The input format for compface (and the output format for uncompface) is
       48  lines  each of 3 sixteen bit hexadecimal integers, comma terminated
       in C initialiser style.	The output format of compface (and  the	 input
       format  for uncompface) is some number of lines made up of a space fol‐
       lowed by printable characters (in the range ``!'' to ``~''  inclusive).
       The  first  line	 contains 72 characters and following lines contain 79
       characters except that the last line may be short.

       The amount of compression obtained varies between face image files  but
       the  output of compface averages less than 200 characters.  The average
       number of output lines is three.

DIAGNOSTICS
       The return value is normally 0.	1 will be returned if extra input  has
       been  ignored  during a compress operation.  -1 is returned in the case
       of an invalid input format.  -2 is returned if an internal buffer over‐
       run occurs.

SEE ALSO
       Compface(1)

				15 January 2002			   COMPFACE(3)
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