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/*************************************************************************
** JFM.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 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 <algorithm>
#include <cstring>
#include <fstream>
#include <sstream>
#include "JFM.hpp"
#include "StreamReader.hpp"
using namespace std;
JFM::JFM (istream &is) {
is.seekg(0);
StreamReader reader(is);
uint16_t id = uint16_t(reader.readUnsigned(2)); // JFM ID (9 or 11)
if (id != 9 && id != 11)
throw FontMetricException("invalid JFM identifier " + std::to_string(id) + " (9 or 11 expected)");
_vertical = (id == 9);
uint16_t nt = uint16_t(reader.readUnsigned(2)); // length of character type table
uint16_t lf = uint16_t(reader.readUnsigned(2)); // length of entire file in 4 byte words
uint16_t lh = uint16_t(reader.readUnsigned(2)); // length of header in 4 byte words
uint16_t bc = uint16_t(reader.readUnsigned(2)); // smallest character code in font
uint16_t ec = uint16_t(reader.readUnsigned(2)); // largest character code in font
uint16_t nw = uint16_t(reader.readUnsigned(2)); // number of words in width table
uint16_t nh = uint16_t(reader.readUnsigned(2)); // number of words in height table
uint16_t nd = uint16_t(reader.readUnsigned(2)); // number of words in depth table
uint16_t ni = uint16_t(reader.readUnsigned(2)); // number of words in italic corr. table
uint16_t nl = uint16_t(reader.readUnsigned(2)); // number of words in glue/kern table
uint16_t nk = uint16_t(reader.readUnsigned(2)); // number of words in kern table
uint16_t ng = uint16_t(reader.readUnsigned(2)); // number of words in glue table
uint16_t np = uint16_t(reader.readUnsigned(2)); // number of font parameter words
if (7+nt+lh+(ec-bc+1)+nw+nh+nd+ni+nl+nk+ng+np != lf)
throw FontMetricException("inconsistent length values");
setCharRange(bc, ec);
readHeader(reader);
is.seekg(28+lh*4);
readTables(reader, nt, nw, nh, nd, ni);
is.seekg(4*(lf-np), ios::beg);
readParameters(reader, np); // JFM files provide 9 parameters but we don't need all of them
}
void JFM::readTables (StreamReader &reader, int nt, int nw, int nh, int nd, int ni) {
// determine smallest charcode with chartype > 0
uint32_t minchar=0xFFFFFFFF, maxchar=0;
for (int i=0; i < nt; i++) {
// support new JFM spec by texjporg
uint32_t c = reader.readUnsigned(2);
c += 0x10000 * reader.readUnsigned(1);
uint8_t t = uint8_t(reader.readUnsigned(1));
if (t > 0) {
minchar = min(minchar, c);
maxchar = max(maxchar, c);
}
}
// build charcode to chartype map
if (minchar <= maxchar) {
_minchar = minchar;
_charTypeTable.resize(maxchar-minchar+1, 0);
reader.seek(-nt*4, ios::cur);
for (int i=0; i < nt; i++) {
// support new JFM spec by texjporg
uint32_t c = reader.readUnsigned(2);
c += 0x10000 * reader.readUnsigned(1);
uint8_t t = uint8_t(reader.readUnsigned(1));
if (c >= minchar)
_charTypeTable[c-minchar] = t;
}
}
TFM::readTables(reader, nw, nh, nd, ni);
}
int JFM::charIndex (int c) const {
uint8_t chartype = 0;
if (!_charTypeTable.empty() && uint32_t(c) >= _minchar && uint32_t(c) < _minchar+_charTypeTable.size())
chartype = _charTypeTable[c-_minchar];
return TFM::charIndex(chartype);
}
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