This file is indexed.

/usr/share/perl5/Font/TTF/Head.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
package Font::TTF::Head;

=head1 NAME

Font::TTF::Head - The head table for a TTF Font

=head1 DESCRIPTION

This is a very basic table with just instance variables as described in the
TTF documentation, using the same names. One of the most commonly used is
C<unitsPerEm>.

=head1 INSTANCE VARIABLES

The C<head> table has no internal instance variables beyond those common to all
tables and those specified in the standard:

    version
    fontRevision
    checkSumAdjustment
    magicNumber
    flags
    unitsPerEm
    created
    modified
    xMin
    yMin
    xMax
    yMax
    macStyle
    lowestRecPPEM
    fontDirectionHint
    indexToLocFormat
    glyphDataFormat

The two dates are held as an array of two unsigned longs (32-bits)

=head1 METHODS

=cut

use strict;
use vars qw(@ISA %fields @field_info);

require Font::TTF::Table;
use Font::TTF::Utils;

@ISA = qw(Font::TTF::Table);
@field_info = (
    'version' => 'v',
    'fontRevision' => 'f',
    'checkSumAdjustment' => 'L',
    'magicNumber' => 'L',
    'flags' => 'S',
    'unitsPerEm' => 'S',
    'created' => 'L2',
    'modified' => 'L2',
    'xMin' => 's',
    'yMin' => 's',
    'xMax' => 's',
    'yMax' => 's',
    'macStyle' => 'S',
    'lowestRecPPEM' => 'S',
    'fontDirectionHint' => 's',
    'indexToLocFormat' => 's',
    'glyphDataFormat' => 's');

sub init
{
    my ($k, $v, $c, $i);
    for ($i = 0; $i < $#field_info; $i += 2)
    {
        ($k, $v, $c) = TTF_Init_Fields($field_info[$i], $c, $field_info[$i + 1]);
        next unless defined $k && $k ne "";
        $fields{$k} = $v;
    }
}


=head2 $t->read

Reads the table into memory thanks to some utility functions

=cut

sub read
{
    my ($self) = @_;
    my ($dat);

    $self->SUPER::read || return $self;

    init unless defined $fields{'Ascender'};
    $self->{' INFILE'}->read($dat, 54);

    TTF_Read_Fields($self, $dat, \%fields);
    $self;
}


=head2 $t->out($fh)

Writes the table to a file either from memory or by copying. If in memory
(which is usually) the checkSumAdjustment field is set to 0 as per the default
if the file checksum is not to be considered.

=cut

sub out
{
    my ($self, $fh) = @_;

    return $self->SUPER::out($fh) unless $self->{' read'};      # this is never true
#    $self->{'checkSumAdjustment'} = 0 unless $self->{' PARENT'}{' wantsig'};
    $fh->print(TTF_Out_Fields($self, \%fields, 54));
    $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 54;
}


=head2 $t->XML_element($context, $depth, $key, $value)

Handles date process for the XML exporter

=cut

sub XML_element
{
    my ($self) = shift;
    my ($context, $depth, $key, $value) = @_;
    my ($fh) = $context->{'fh'};
    my ($output, @time);
    my (@month) = qw(JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC);

    return $self->SUPER::XML_element(@_) unless ($key eq 'created' || $key eq 'modified');

    @time = gmtime($self->getdate($key eq 'created'));
    $output = sprintf("%d/%s/%d %d:%d:%d", $time[3], $month[$time[4]], $time[5] + 1900,
            $time[2], $time[1], $time[0]);
    $fh->print("$depth<$key>$output</$key>\n");
    $self;
}
    

=head2 $t->update

Updates the head table based on the glyph data and the hmtx table

=cut

sub update
{
    my ($self) = @_;
    my ($num, $i, $loc, $hmtx);
    my ($xMin, $yMin, $xMax, $yMax, $lsbx);

    return undef unless ($self->SUPER::update);

    $num = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
    return undef unless (defined $self->{' PARENT'}{'hmtx'} && defined $self->{' PARENT'}{'loca'});
    $hmtx = $self->{' PARENT'}{'hmtx'}->read;
    
    $self->{' PARENT'}{'loca'}->update;
    $hmtx->update;              # if we updated, then the flags will be set anyway.
    $lsbx = 1;
    for ($i = 0; $i < $num; $i++)
    {
        $loc = $self->{' PARENT'}{'loca'}{'glyphs'}[$i];
        next unless defined $loc;
        $loc->read->update_bbox;
        $xMin = $loc->{'xMin'} if ($loc->{'xMin'} < $xMin || $i == 0);
        $yMin = $loc->{'yMin'} if ($loc->{'yMin'} < $yMin || $i == 0);
        $xMax = $loc->{'xMax'} if ($loc->{'xMax'} > $xMax);
        $yMax = $loc->{'yMax'} if ($loc->{'yMax'} > $yMax);
        $lsbx &= ($loc->{'xMin'} == $hmtx->{'lsb'}[$i]);
    }
    $self->{'xMin'} = $xMin;
    $self->{'yMin'} = $yMin;
    $self->{'xMax'} = $xMax;
    $self->{'yMax'} = $yMax;
    if ($lsbx)
    { $self->{'flags'} |= 2; }
    else
    { $self->{'flags'} &= ~2; }
    $self;
}


=head2 $t->getdate($is_create)

Converts font modification time (or creation time if $is_create is set) to a 32-bit integer as returned
from time(). Returns undef if the value is out of range, either before the epoch or after the maximum
storable time.

=cut

sub getdate
{
    my ($self, $is_create) = @_;
    my (@arr) = (@{$self->{$is_create ? 'created' : 'modified'}});

    $arr[1] -= 2082844800;        # seconds between 1/Jan/1904 and 1/Jan/1970 (midnight)
    if ($arr[1] < 0)
    {
        $arr[1] += 0xFFFFFFF; $arr[1]++;
        $arr[0]--;
    }
    return undef if $arr[0] != 0;
    return $arr[1];
}


=head2 $t->setdate($time, $is_create)

Sets the time information for modification (or creation time if $is_create is set) according to the 32-bit
time information.

=cut

sub setdate
{
    my ($self, $time, $is_create) = @_;
    my (@arr);

    $arr[1] = $time;
    if ($arr[1] >= 0x83DA4F80)
    {
        $arr[1] -= 0xFFFFFFFF;
        $arr[1]--;
        $arr[0]++;
    }
    $arr[1] += 2082844800;
    $self->{$is_create ? 'created' : 'modified'} = \@arr;
    $self;
}
    

1;


=head1 BUGS

None known

=head1 AUTHOR

Martin Hosken L<Martin_Hosken@sil.org>. 


=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