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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 <cstdint>
#include <stdexcept>
#include <string>
#include <vector>
namespace ttf {
class ParseError : public std::runtime_error
{
public:
ParseError() : std::runtime_error("Parse error") {}
};
/** Class which offers data read from a memory buffer */
class Source
{
public:
explicit Source(std::vector<uint8_t> const& data);
Source(uint8_t const* data, int size);
Source(Source& other, uint32_t offset);
uint16_t get_uint16();
uint32_t get_uint32();
std::string get_string(uint32_t offset, uint16_t length);
std::wstring get_wstring(uint32_t offset, uint16_t length);
std::vector<uint8_t> get_block(uint32_t offset, uint32_t length);
uint32_t offset() const {
return _offset;
}
uint8_t const* data() {
return _data;
}
int size() const {
return _size;
}
private:
uint8_t const* _data;
int _size;
uint32_t _offset;
};
/** Class which accepts data to be written into a memory buffer */
class Sink
{
public:
explicit Sink(std::vector<uint8_t>& data, uint32_t offset = 0);
Sink(Sink&) = delete;
Sink& operator=(Sink&) = delete;
Sink(Sink&& other) = delete;
Sink& operator=(Sink&& other) = delete;
void put(uint16_t value);
void put(uint32_t value);
void put(uint32_t value, uint32_t offset);
void put(std::string const& data);
void put(std::wstring const& data);
void put(std::vector<uint8_t> const& data);
std::vector<uint8_t>& data() {
return _data;
}
uint32_t initial_offset() const {
return _initial_offset;
}
uint32_t offset() const {
return _offset;
}
uint32_t offset_from_initial() const {
return _offset - _initial_offset;
}
void set_offset(uint32_t offset) {
_offset = offset;
}
void pad();
uint32_t checksum(uint32_t start) const;
private:
std::vector<uint8_t>& _data;
uint32_t _initial_offset;
uint32_t _offset;
};
/** Sink which starts at a given offset from another Sink's offset,
* and on destruction sets its parent offset to be the same as its
* own.
*/
class SubSink : public Sink
{
public:
explicit SubSink(Sink& parent, uint32_t offset = 0);
SubSink(SubSink const&) = delete;
SubSink& operator=(SubSink const&) = delete;
SubSink(SubSink&& other) = delete;
SubSink& operator=(SubSink&& other) = delete;
~SubSink();
private:
Sink& _parent;
};
uint32_t checksum(std::vector<uint8_t> const& data);
uint32_t checksum(uint8_t const* data, uint32_t size);
}
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