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/*
Copyright (C) 2026 Carl Hetherington <cth@carlh.net>
This file is part of libttf.
libttf is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libttf is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libttf. If not, see <http://www.gnu.org/licenses/>.
*/
#include "name_table.h"
#include "table.h"
#include "tags.h"
#include "util.h"
#include <algorithm>
using namespace ttf;
Table::Table(Source& source, int header_index)
: _header_index(header_index)
, _checksum(source.get_uint32())
, _offset(source.get_uint32())
, _length(source.get_uint32())
{
}
OtherTable::OtherTable(Source& source, int header_index, uint32_t tag)
: Table(source, header_index)
, _tag(tag)
{
_data = source.get_block(_offset, _length);
}
void
OtherTable::write(Sink& header_sink, Sink&& data_sink) const
{
header_sink.put(_tag);
header_sink.put(checksum(_data));
header_sink.put(data_sink.offset());
header_sink.put(static_cast<uint32_t>(_data.size()));
data_sink.put(_data);
data_sink.pad();
}
HeadTable::HeadTable(Source& source, int header_index)
: Table(source, header_index)
{
_data = source.get_block(_offset, _length);
}
void
HeadTable::write(Sink& header_sink, Sink&& data_sink) const
{
header_sink.put(HEAD);
if (_data.size() < 12) {
throw InvalidTableSize();
}
std::vector<uint8_t> data = _data;
/* Zero out the checkSumAdjustment */
data[8] = 0;
data[9] = 0;
data[10] = 0;
data[11] = 0;
header_sink.put(checksum(data));
header_sink.put(data_sink.offset());
header_sink.put(static_cast<uint32_t>(data.size()));
data_sink.put(data);
data_sink.pad();
}
void
HeadTable::set_checksum_adjustment(Sink& data_sink, uint32_t adjustment)
{
data_sink.put(adjustment, _offset + 8);
}
std::shared_ptr<Table>
ttf::make_table(Source& source, int header_index)
{
auto const tag = source.get_uint32();
std::shared_ptr<Table> table;
switch (tag) {
case NAME:
return std::make_shared<NameTable>(source, header_index);
case HEAD:
return std::make_shared<HeadTable>(source, header_index);
default:
return std::make_shared<OtherTable>(source, header_index, tag);
}
}
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