1 files changed, 53 insertions, 0 deletions
diff --git a/compface.3 b/compface.3
new file mode 100644
index 0000000..d00f1c7
--- /dev/null
+++ b/compface.3
@@ -0,0 +1,53 @@
+.TH COMPFACE 3 "25 January 1990"
+.SH NAME
+compface, uncompface \- compress and expand 48x48x1 face image files
+.SH SYNOPSIS
+.B compface (buf)
+.LP
+.B uncompface (buf)
+.LP
+.B char *buf
+.SH DESCRIPTION
+.IX  compface  ""  "\fLcompface\fP \(em compress face image files"
+.IX  uncompface  ""  "\fLuncompface\fP \(em uncompress face image files"
+.I compface
+is a function for generating highly compressed representations of 48x48x1
+face image files.
+.I 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.
+.I Buf
+should therefore point to a block of 2K size or more to avoid buffer
+overruns during output generation.
+.LP
+The input format for
+.I compface
+(and the output format for
+.IR uncompface )
+is 48 lines each of 3 sixteen bit hexadecimal integers, comma terminated in C
+initialiser style.
+The output format of
+.I compface
+(and the input format for
+.IR uncompface )
+is some number of lines made up of a space followed 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.
+.LP
+The amount of compression obtained varies between face image files but
+the output of
+.I compface
+averages less than 200 characters.
+The average number of output lines is three.
+.SH 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 overrun occurs.
+.SH SEE ALSO
+Compface(1)