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/*************************************************************************
** EncFile.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2021 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 "Font.hpp"
#include "EncFile.hpp"
#include "InputBuffer.hpp"
#include "InputReader.hpp"
#include "FileFinder.hpp"
#include "Message.hpp"
using namespace std;
static string read_entry (InputReader &in);
static bool valid_name_char (int c);
EncFile::EncFile (string encname) : _encname(std::move(encname))
{
read();
}
const char* EncFile::path () const {
return FileFinder::instance().lookup(_encname+".enc", false);
}
/** Search for suitable enc-file and read its encoding information.
* The file contents must be a valid PostScript vector with 256 entries. */
void EncFile::read () {
if (const char *p = path()) {
ifstream ifs(p);
read(ifs);
}
else
Message::wstream(true) << "encoding file '" << _encname << ".enc' not found\n";
}
/** Read encoding information from stream. */
void EncFile::read (istream &is) {
StreamInputBuffer ib(is, 256);
BufferInputReader in(ib);
_table.resize(256);
// find beginning of vector
while (!in.eof()) {
in.skipSpace();
if (in.peek() == '%')
in.skipUntil("\n");
else
if (in.get() == '[')
break;
}
// read vector entries
int n=0;
while (!in.eof()) {
in.skipSpace();
if (in.peek() == '%')
in.skipUntil("\n");
else if (in.peek() == ']') {
in.get();
break;
}
else {
string entry = read_entry(in);
if (entry == ".notdef")
entry.clear();
if (n < 256)
_table[n++] = entry;
}
}
// remove trailing .notdef names
for (n--; n > 0 && _table[n].empty(); n--);
_table.resize(n+1);
}
static string read_entry (InputReader &in) {
string entry;
bool accept_slashes=true;
while (!in.eof() && ((in.peek() == '/' && accept_slashes) || valid_name_char(in.peek()))) {
if (in.peek() != '/')
accept_slashes = false;
entry += char(in.get());
}
if (entry.length() > 1) {
// strip leading slashes
// According to the PostScript specification, a single slash without further
// following characters is a valid name.
size_t n=0;
while (n < entry.length() && entry[n] == '/')
n++;
entry = entry.substr(n);
}
return entry;
}
static bool valid_name_char (int c) {
const char *delimiters = "<>(){}[]/~%";
return isprint(c) && !isspace(c) && !strchr(delimiters, c);
}
/** Returns an entry of the encoding table.
* @param[in] c character code
* @return character name assigned to character code c*/
const char* EncFile::charName (uint32_t c) const {
if (c < _table.size())
return !_table[c].empty() ? _table[c].c_str() : nullptr;
return nullptr;
}
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