diff options
Diffstat (limited to 'dviware/dvisvgm/src/EncFile.cpp')
-rw-r--r-- | dviware/dvisvgm/src/EncFile.cpp | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/EncFile.cpp b/dviware/dvisvgm/src/EncFile.cpp new file mode 100644 index 0000000000..dba0a2544a --- /dev/null +++ b/dviware/dvisvgm/src/EncFile.cpp @@ -0,0 +1,132 @@ +/************************************************************************* +** EncFile.cpp ** +** ** +** This file is part of dvisvgm -- a fast DVI to SVG converter ** +** Copyright (C) 2005-2019 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; +} |