This file is indexed.

/usr/share/perl5/Font/TTF/GrFeat.pm is in libfont-ttf-perl 1.04-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
package Font::TTF::GrFeat;

=head1 NAME

Font::TTF::GrFeat - Graphite Font Features

=head1 DESCRIPTION

=head1 INSTANCE VARIABLES

=over 4

=item version

=item features

An array of hashes of the following form

=over 8

=item feature

feature id number

=item name

name index in name table

=item exclusive

exclusive flag

=item default

the default setting number

=item settings

hash of setting number against name string index

=back

=back

=head1 METHODS

=cut

use strict;
use vars qw(@ISA);

use Font::TTF::Utils;

require Font::TTF::Table;

@ISA = qw(Font::TTF::Table);

=head2 $t->read

Reads the features from the TTF file into memory

=cut

sub read
{
	my ($self) = @_;
	my ($featureCount, $features);

	return $self if $self->{' read'};
	$self->SUPER::read_dat or return $self;

	($self->{'version'}, $featureCount) = TTF_Unpack("vS", $self->{' dat'});

	$features = [];
	foreach (1 .. $featureCount) {
		my ($feature, $nSettings, $settingTable, $featureFlags, $nameIndex, $reserved);
		if ($self->{'version'} == 1)
		{
			($feature, $nSettings, $settingTable, $featureFlags, $nameIndex)
				= TTF_Unpack("SSLSS", substr($self->{' dat'}, $_ * 12, 12));
			#The version 1 Feat table ends with a feature (id 1) named NoName
			#with zero settings but with an offset to the last entry in the setting
			#array. This last setting has id 0 and an invalid name id. This last
			#feature is changed to have one setting.
			if ($_ == $featureCount && $nSettings == 0) {$nSettings = 1;}
		}
		else #version == 2
			{($feature, $nSettings, $reserved, $settingTable, $featureFlags, $nameIndex)
				= TTF_Unpack("LSSLSS", substr($self->{' dat'}, 12 + ($_ - 1) * 16, 16))};
		$feature = 
			{
				'feature'	=> $feature,
				'name'		=> $nameIndex,
			};
			
		#interpret the featureFlags & store settings
		$feature->{'exclusive'} = (($featureFlags & 0x8000) != 0);
		
		my @settings = TTF_Unpack("S*", substr($self->{' dat'}, $settingTable, $nSettings * 4));
		if ($featureFlags & 0x4000)
			{$feature->{'default'} = $featureFlags & 0x00FF;}
		else
			{$feature->{'default'} = $settings[0];}
		$feature->{'settings'} = {@settings};
		
		push(@$features, $feature);
	}
	
	$self->{'features'} = $features;
	
	delete $self->{' dat'}; # no longer needed, and may become obsolete
	$self->{' read'} = 1;
	$self;
}

=head2 $t->out($fh)

Writes the features to a TTF file

=cut

sub out
{
	my ($self, $fh) = @_;
	my ($features, $numFeatures, $settings, $featureFlags, $featuresData, $settingsData);
	
	return $self->SUPER::out($fh) unless $self->{' read'};

	$features = $self->{'features'};
	$numFeatures = @$features;
	$featuresData = $settingsData = '';

	foreach (@$features) {
		$settings = $_->{'settings'};
		$featureFlags = ($_->{'exclusive'} ? 0x8000 : 0x0000);
		
#		output default setting first instead of using the featureFlags (as done below)
#		$featureFlags = ($_->{'exclusive'} ? 0x8000 : 0x0000) |
#								($_->{'default'} != 0 ? 0x4000 | ($_->{'default'} & 0x00FF) 
#														: 0x0000);
		if ($self->{'version'} == 1)
		{
			$featuresData .= TTF_Pack("SSLSS",
										$_->{'feature'},
										scalar keys %$settings,
										12 + 12 * $numFeatures + length $settingsData,
										$featureFlags, 
										$_->{'name'});
		}
		else #version == 2
		{
			$featuresData .= TTF_Pack("LSSLSS",
										$_->{'feature'},
										scalar keys %$settings,
										0, 
										12 + 16 * $numFeatures + length $settingsData,
										$featureFlags, 
										$_->{'name'});
		}
		
		#output default setting first
		#the settings may not be in their original order
		my $defaultSetting = $_->{'default'};
		$settingsData .= TTF_Pack("SS", $defaultSetting, $settings->{$defaultSetting});
		foreach (sort {$a <=> $b} keys %$settings) {
			if ($_ == $defaultSetting) {next;} #skip default setting
			$settingsData .= TTF_Pack("SS", $_, $settings->{$_});
		}
	}

	$fh->print(TTF_Pack("vSSL", $self->{'version'}, $numFeatures, 0, 0));
	$fh->print($featuresData);
	$fh->print($settingsData);

	$self;
}

=head2 $t->minsize()

Returns the minimum size this table can be. If it is smaller than this, then the table
must be bad and should be deleted or whatever.

=cut

sub minsize
{
    return 6;
}

=head2 $t->print($fh)

Prints a human-readable representation of the table

=cut

sub print
{
	my ($self, $fh) = @_;
	my ($names, $features, $settings);

	$self->read;

	$names = $self->{' PARENT'}->{'name'};
	$names->read;

	$fh = 'STDOUT' unless defined $fh;

	$features = $self->{'features'};
	foreach (@$features) {
		$fh->printf("Feature %s, %s, default: %d name %d # '%s'\n",
					$_->{'feature'} > 0x01000000 ? '"' . $self->num_to_tag($_->{'feature'}) . '"' : $_->{'feature'}, 
					($_->{'exclusive'} ? "exclusive" : "additive"),
					$_->{'default'}, 
					$_->{'name'},
					$names->{'strings'}[$_->{'name'}][3][1]{1033});
		$settings = $_->{'settings'};
		foreach (sort { $a <=> $b } keys %$settings) {
			$fh->printf("\tSetting %d, name %d # '%s'\n",
						$_, $settings->{$_}, $names->{'strings'}[$settings->{$_}][3][1]{1033});
		}
	}
	
	$self;
}

sub settingName
{
	my ($self, $feature, $setting) = @_;

	$self->read;

	my $names = $self->{' PARENT'}->{'name'};
	$names->read;
	
	my $features = $self->{'features'};
	my ($featureEntry) = grep { $_->{'feature'} == $feature } @$features;
	my $featureName = $names->{'strings'}[$featureEntry->{'name'}][3][1]{1033};
	my $settingName = $featureEntry->{'exclusive'}
			? $names->{'strings'}[$featureEntry->{'settings'}->{$setting}][3][1]{1033}
			: $names->{'strings'}[$featureEntry->{'settings'}->{$setting & ~1}][3][1]{1033}
				. (($setting & 1) == 0 ? " On" : " Off");

	($featureName, $settingName);
}

=head2 $t->tag_to_num ($feat_str)

Convert an alphanumeric feature id tag (string) to a number (32-bit).
Tags are normally 4 chars. Graphite ignores space
padding if it is present, so we do the same here.

=cut

sub tag_to_num
{
	my ($self, $feat_tag) = @_;
	my $new_feat_num;
	
	if ($feat_tag > 0)
		{$new_feat_num = $feat_tag;}	# already a number, so just return it.
	else
	{
		$feat_tag =~ s/[ \000]+$//o;	# strip trailing nulls or space
		$new_feat_num = unpack('N', pack('a4', $feat_tag)); #adds null padding on right if less than 4 chars
	}
	
	return $new_feat_num;
}

=head2 $t->num_to_tag ($feat_num)

Convert a feature id number (32-bit) back to a tag (string).
Trailing space or null padding is removed.
Feature id numbers that do not represent alphanumeric tags 
are returned unchanged.

=cut

sub num_to_tag
{
	my ($self, $feat_num) = @_;
	my $new_feat_tag;
	
	if ($feat_num > 0x01000000)
	{
		$new_feat_tag = unpack('a4', pack('N', $feat_num));
		$new_feat_tag =~ s/[ \000]+$//o;	# strip trailing nulls or space
	}
	else
		{$new_feat_tag = $feat_num;}
	
	return $new_feat_tag;
}

1;

=head1 BUGS

The version 1 Feat table ends with a feature (id 1) named NoName
with zero settings but with an offset to the last entry in the setting
array. This last setting has id 0 and an invalid name id. This last
feature is changed to have one setting.

=head1 AUTHOR

Alan Ward (derived from Jonathan Kew's Feat.pm).


=head1 LICENSING

Copyright (c) 1998-2013, SIL International (http://www.sil.org) 

This module is released under the terms of the Artistic License 2.0. 
For details, see the full text of the license in the file LICENSE.



=cut