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#!/usr/bin/env perl
# $Id: lib_ttfdir.pl,v 1.4 2003/08/05 16:26:37 s42335 Exp $
#
# lib_ttfdir.pl - ttf directory handling (used in ttf* tools)
#
# 2002/2, by 1@2ch
# * public domain *
#
# ttf_readdir_from_ttf(): read a ttf directory from a file opened
# ttf_cat_type($type): dump a specified table in ttf file
# ttf_calc_sum($file): calc the sum of a table
# GLOBAL VARIABLES:
# $ttf_is_ttc
# $ttc_version
# @ttc_ttfdirs
#
# $ttf_font_type
# $ttf_num_tables
# $ttf_fontdir_types[]
# $ttf_fontdir_sum{$type}
# $ttf_fontdir_offset{$type}
# $ttf_fontdir_length{$type}
require 'lib_util.pl';
sub ttf_readdir_from_ttf() {
$t = rstr32();
if ($t eq "ttcf") {
# TTC file
$ttf_is_ttc = 1;
$ttc_version = ruint32();
$ttc_num_ttfdirs = ruint32();
@ttc_ttfdiroffsets = ();
for(my $i=0; $i < $ttc_num_ttfdirs; $i++) {
push(@ttc_ttfdiroffsets, ruint32());
}
@ttc_ttfdirs = ();
foreach my $offset (@ttc_ttfdiroffsets) {
rgoto($offset);
ttf_readdir_from_ttf_1();
local $font_type1 = $ttf_font_type;
local $num_tables1 = $ttf_num_tables;
local @fontdir_types1 = @ttf_fontdir_types;
local %fontdir_sum1 = %ttf_fontdir_sum;
local %fontdir_offset1 = %ttf_fontdir_offset;
local %fontdir_length1 = %ttf_fontdir_length;
push(@ttc_ttfdirs, [\$font_type1, \$num_tables1, \@fontdir_types1,
\%fontdir_sum1, \%fontdir_offset1, \%fontdir_length1]);
}
} else {
$ttf_is_ttc = 0;
ttf_readdir_from_ttf_1($t);
}
}
# ttf_cd
sub ttf_cd($) {
if (!$ttf_is_ttc) {
die("not ttc file.");
}
my $x = $ttc_ttfdirs[$_[0]];
$ttf_font_type = ${$x->[0]};
$ttf_num_tables = ${$x->[1]};
@ttf_fontdir_types = @{$x->[2]};
%ttf_fontdir_num = %{$x->[3]};
%ttf_fontdir_offset = %{$x->[4]};
%ttf_fontdir_length = %{$x->[5]};
}
sub ttf_autocd($) {
my $s = $_[0];
if ($s =~ /^(\d+):(.+)$/) {
ttf_cd($1);
return $2;
}
return $s;
}
# ttf_readdir_from_ttf_1()
sub ttf_readdir_from_ttf_1($) {
# read header
$ttf_font_type = $_[0] || rstr32();
$ttf_num_tables = ruint16();
@ttf_fontdir_types = ();
%ttf_fontdir_sum = ();
%ttf_fontdir_offset = ();
%ttf_fontdir_length = ();
ruint16(); # searchRange
ruint16(); # entrySelector
ruint16(); # rangeShift
# read directory
for(my $i = 0; $i < $ttf_num_tables; $i++) {
my $t = rstr32();
push(@ttf_fontdir_types, $t);
$ttf_fontdir_sum{$t} = ruint32();
$ttf_fontdir_offset{$t} = ruint32();
$ttf_fontdir_length{$t} = ruint32();
}
}
# ttf_cat_type($type)
sub ttf_cat_type($) {
my $t = $_[0];
if (! $ttf_fontdir_offset{$t}) {
err("not found: $t");
return;
}
rgoto($ttf_fontdir_offset{$t});
my $len = $ttf_fontdir_length{$t};
while(0 < $len) {
my $x = rstrn(($BUFSIZ < $len) ? $BUFSIZ : $len);
$len -= length($x);
wstrn($x);
}
}
# ttf_calc_sum($file)
sub calc_sum($) {
my $s = 0;
my $x = $_[0];
my $len = length($x);
# padding to make the data length multiple of 4
$x .= "\000" x (4-($len % 4)) if ($len % 4);
for(my $i = 0; $i < length($x); $i += 4) {
$s = addint($s, unpack('N', substr($x, $i, 4)));
}
$s;
}
sub ttf_calc_sum($) {
ropen($_[0]);
my $s = 0;
while(my $x = rstrn($BUFSIZ)) {
$s = addint($s, calc_sum($x));
}
rclose();
$s;
}
1;
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