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/*************************************************************************
** FontMetrics.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2024 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program 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 3 of **
** the License, or (at your option) any later version. **
** **
** This program 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 this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <fstream>
#include <memory>
#include "FileFinder.hpp"
#include "FontMetrics.hpp"
#include "JFM.hpp"
#include "OFM.hpp"
#include "utility.hpp"
using namespace std;
static inline uint16_t read_uint16 (istream &is) {
uint16_t val = 256*is.get();
return val + is.get();
}
/** Reads the font metrics for a given font name from a TFM, JFM, or OFM file.
* @param[in] fontname name of font to get the metrics for.
* @return pointer to object that holds the font metrics, or nullptr if no matching file was found */
unique_ptr<FontMetrics> FontMetrics::read (const string &fontname) {
unique_ptr<FontMetrics> metrics;
const char *path = FileFinder::instance().lookup(fontname + ".ofm", false);
if (!path)
path = FileFinder::instance().lookup(fontname + ".tfm");
ifstream ifs(path, ios::binary);
if (ifs) {
auto id = read_uint16(ifs);
if (id == 0) { // OFM?
auto ofmLevel = read_uint16(ifs);
if (ofmLevel == 0)
metrics = util::make_unique<OFM0>();
else if (ofmLevel == 1)
metrics = util::make_unique<OFM1>();
else
throw FontMetricException("OFM level "+to_string(ofmLevel)+" not supported");
}
else if (id == 9 || id == 11) // Japanese font metric file?
metrics = util::make_unique<JFM>();
else
metrics = util::make_unique<TFM>();
metrics->read(ifs);
}
return metrics;
}
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