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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 "font.h"
#include "name_table.h"
#include "util.h"
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
#include <algorithm>
#include <cmath>
#include <fstream>
#include <iostream>
using namespace ttf;
Font::Font(boost::filesystem::path const& ttf_file)
{
boost::filesystem::ifstream str(ttf_file, std::ios::binary);
std::vector<uint8_t> data(boost::filesystem::file_size(ttf_file));
str.read(reinterpret_cast<char*>(data.data()), data.size());
Source source(data);
read_source(source);
}
Font::Font(uint8_t const* data, int size)
{
Source source(data, size);
read_source(source);
}
Font::Font(Source& source)
{
read_source(source);
}
void
Font::read_source(Source& source)
{
_scalar_type = source.get_uint32();
if (_scalar_type != 0x00010000 && _scalar_type != 0x74727565) {
throw InvalidScalerType(_scalar_type);
}
_num_tables = source.get_uint16();
auto const search_range = source.get_uint16();
auto const entry_selector = source.get_uint16();
auto const range_shift = source.get_uint16();
for (auto table = 0; table < _num_tables; ++table) {
_tables.push_back(make_table(source, table));
}
std::sort(_tables.begin(), _tables.end(), [](std::shared_ptr<const Table> a, std::shared_ptr<const Table> b) { return a->offset() < b->offset(); });
}
void
Font::write(boost::filesystem::path const& ttf_file) const
{
std::vector<uint8_t> data(65536);
Sink header_sink(data);
header_sink.put(_scalar_type);
header_sink.put(_num_tables);
auto constexpr TABLE_SIZE = 16;
uint16_t const log_max_power = std::floor(std::log(_num_tables) / std::log(2));
uint16_t const search_range = pow(2, log_max_power) * TABLE_SIZE;
header_sink.put(search_range);
header_sink.put(log_max_power);
header_sink.put(static_cast<uint16_t>(_num_tables * TABLE_SIZE - search_range));
auto const tables_start = header_sink.offset();
Sink data_sink(data, tables_start + _tables.size() * TABLE_SIZE);
for (auto table: _tables) {
header_sink.set_offset(tables_start + table->header_index() * TABLE_SIZE);
table->write(header_sink, SubSink(data_sink));
}
auto const overall_checksum = ttf::checksum(data.data(), data_sink.offset());
for (auto table: _tables) {
if (auto head = std::dynamic_pointer_cast<HeadTable>(table)) {
head->set_checksum_adjustment(data_sink, 0xb1b0afba - overall_checksum);
}
}
boost::filesystem::ofstream file(ttf_file, std::ios::binary);
file.write(reinterpret_cast<char*>(data.data()), data_sink.offset());
}
std::shared_ptr<NameTable>
Font::name_table()
{
auto iter = std::find_if(_tables.begin(), _tables.end(), [](std::shared_ptr<Table> t) { return static_cast<bool>(std::dynamic_pointer_cast<NameTable>(t)); });
if (iter == _tables.end()) {
return {};
}
return std::dynamic_pointer_cast<NameTable>(*iter);
}
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