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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/>.
*/
#pragma once
#include <boost/variant.hpp>
#include <fmt/format.h>
#include <cstdint>
#include <memory>
#include <stdexcept>
#include <string>
#include <vector>
namespace ttf {
class Sink;
class Source;
class InvalidChecksumError : public std::runtime_error
{
public:
InvalidChecksumError() : std::runtime_error("Invalid checksum") {}
};
class UnsupportedPlatformIdentifier : public std::runtime_error
{
public:
UnsupportedPlatformIdentifier(uint16_t platform_id) : std::runtime_error(fmt::format("Unsupported string platform ID {}", platform_id)) {}
};
class InvalidTableSize : public std::runtime_error
{
public:
InvalidTableSize() : std::runtime_error("Invalid table size") {}
};
/** One table in a TTF font */
class Table
{
public:
Table(Source& source, int header_index);
/** @return Index of the table's entry in the header. This
* is used to preserve header order.
*/
int header_index() const {
return _header_index;
}
/** @return offset of table within the font file */
uint32_t offset() const {
return _offset;
}
/** @return length of the table in bytes */
uint32_t length() const {
return _length;
}
virtual void write(Sink& header_sink, Sink&& data_sink) const = 0;
protected:
int _header_index;
uint32_t _checksum;
uint32_t _offset;
uint32_t _length;
};
/** A table that we just pass through blindly */
class OtherTable : public Table
{
public:
OtherTable(Source& source, int header_index, uint32_t tag);
void write(Sink& header_sink, Sink&& data_sink) const override;
protected:
uint32_t _tag;
std::vector<uint8_t> _data;
};
/** The 'head' table */
class HeadTable : public Table
{
public:
HeadTable(Source& source, int header_index);
void write(Sink& header_sink, Sink&& data_sink) const override;
void set_checksum_adjustment(Sink& data_sink, uint32_t adjustment);
private:
std::vector<uint8_t> _data;
};
std::shared_ptr<Table> make_table(Source& source, int header_index);
}
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