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#!/usr/bin/perl
# SPDX-License-Identifier: BSD-2-Clause
# Copyright 1996-2017 The NASM Authors - All Rights Reserved
#
# Parse AFM metric file, returns a reference to fontdata
#
sub parse_afm_file($$) {
my($filename, $filetype) = @_;
my $fontdata = {
widths => {},
kern => {}
};
my $charmetrics = 0;
my $kerndata = 0;
my $charcode, $width, $name;
my $fontfile = $filename.'.'.$filetype;
return undef unless ( -f $fontfile );
$fontdata->{file} = $fontfile;
$fontdata->{type} = $filetype;
$fontdata->{scale} = 1000; # AFM metrics always have scale 1000
return undef unless (open(my $fh, '<', $filename.'.afm'));
while ( my $line = <$fh> ) {
if ( $line =~ /^\s*FontName\s+(.*)\s*$/i ) {
$fontdata->{'name'} = $1;
} elsif ( $line =~ /^\s*StartCharMetrics\b/i ) {
$charmetrics = 1;
} elsif ( $line =~ /^\s*EndCharMetrics\b/i ) {
$charmetrics = 0;
} elsif ( $line =~ /^\s*StartKernPairs\b/i ) {
$kerndata = 1;
} elsif ( $line =~ /^\s*EndKernPairs\b/i ) {
$kerndata = 0;
} elsif ( $charmetrics ) {
my @data = split(/\s*;\s*/, $line);
undef $charcode, $width, $name;
foreach my $d ( @data ) {
my @dd = split(/\s+/, $d);
if ( $dd[0] eq 'C' ) {
$charcode = $dd[1];
} elsif ( $dd[0] eq 'WX' ) {
$width = $dd[1];
} elsif ( $dd[0] eq 'W' ) {
$width = $dd[2];
} elsif ( $dd[0] eq 'N' ) {
$name = $dd[1];
}
}
if ( defined($name) && defined($width) ) {
$fontdata->{widths}{$name} = $width;
}
} elsif ( $kerndata ) {
my($kpx, $a, $b, $adj) = split(/\s+/, $line);
if ( $kpx eq 'KPX' ) {
if (!exists($fontdata->{kern}{$a})) {
$fontdata->{kern}{$a} = {};
}
$fontdata->{kern}{$a}{$b} = $adj;
}
}
}
return $fontdata;
}
1;
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