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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/EncFile.cpp
Initial commit
Diffstat (limited to 'dviware/dvisvgm/src/EncFile.cpp')
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diff --git a/dviware/dvisvgm/src/EncFile.cpp b/dviware/dvisvgm/src/EncFile.cpp
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+++ b/dviware/dvisvgm/src/EncFile.cpp
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+/*************************************************************************
+** 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;
+}