exif.hpp

#pragma once
#include <ostream>
#include <filesystem>

using TAG = uint16_t;

const TAG MARK = 0xFF;

const TAG JPEG = 0xD8FF;

const TAG EXIF = 0xE1FF;
const TAG SOF = 0xC0FF;		// picture resolution
const TAG SOS = 0xDAFF;		// start of frame
const TAG END = 0xD9FF;

const TAG ORNT = 0x0112;
const TAG CAM = 0x0110;
const TAG SIFD = 0x8769;

const TAG DATE = 0x9003;
const TAG WIDTH = 0xA002;
const TAG HIGHT = 0xA003;
const char EXIFID[] = "Exif";

struct File {
	bool pic, exif, sos, sub, dat, res, end;
	std::filesystem::path name, path, dir;
	std::string date, cam;
	std::string year, month, day;
	uint32_t size;
	uint16_t hight, width, ornt;
	void operator<<(std::ifstream&);
	operator bool() const {
		return pic && exif && sos && sub && dat && end
			&& !date.empty()
			&& strtol(year.c_str(), NULL, 10)
			&& strtol(month.c_str(), NULL, 10)
			&& strtol(day.c_str(), NULL, 10);
	}
	File(const std::filesystem::path& entry) {
		pic = exif = sos = sub = end = dat = res = false;
		size = width = hight = ornt = 0;
		name = entry.filename();
		path = entry.parent_path();
	}
	bool operator>(const File&);
	friend std::ostream& operator<<(std::ostream&, const File&);
	std::filesystem::path full() const { return path / name; }
	std::filesystem::path target() const { return dir / name; }
	std::string dump(const File&) const;
	bool commit();
};