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authorKarl Berry <karl@freefriends.org>2021-02-25 19:22:25 +0000
committerKarl Berry <karl@freefriends.org>2021-02-25 19:22:25 +0000
commitad547a6b5986815fda458221149728d9d9ab1d87 (patch)
tree16296910eb3eca724371474ea9aea3994dc69614 /Build/source/texk/dvisvgm/dvisvgm-src/src/BasicDVIReader.hpp
parent947b43de3dd21d58ccc2ffadefc4441ea1c2a813 (diff)
restore Build,TODO from r57911
git-svn-id: svn://tug.org/texlive/trunk@57915 c570f23f-e606-0410-a88d-b1316a301751
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+/*************************************************************************
+** BasicDVIReader.hpp **
+** **
+** 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/>. **
+*************************************************************************/
+
+#ifndef BASICDVIREADER_HPP
+#define BASICDVIREADER_HPP
+
+#include "Matrix.hpp"
+#include "MessageException.hpp"
+#include "StreamReader.hpp"
+
+struct DVIException : public MessageException {
+ explicit DVIException (const std::string &msg) : MessageException(msg) {}
+};
+
+
+struct InvalidDVIFileException : public DVIException {
+ explicit InvalidDVIFileException (const std::string &msg) : DVIException(msg) {}
+};
+
+
+/** This class provides the basic functionality to read a DVI file.
+ * It just skips all DVI commands and apply any semantic to it. The latter must
+ * be realized by deriving a separate class that implements the cmdXXX template
+ * methods. These are low-level functions that represent the DVI commands and
+ * require to read and evaluate the correct portion of data from the DVI stream.
+ * Since the DVI commands are almost skipped by advancing the file pointer,
+ * running through a DVI file is pretty fast. */
+class BasicDVIReader : public StreamReader {
+ protected:
+ using CommandHandler = void (BasicDVIReader::*)(int);
+ enum DVIVersion {DVI_NONE=0, DVI_STANDARD=2, DVI_PTEX=3, DVI_XDV5=5, DVI_XDV6=6, DVI_XDV7=7};
+ const uint8_t OP_SETCHAR0=0, OP_SETCHAR127=127, OP_SET1=128, OP_BOP=139, OP_EOP=140, OP_FNTNUM0=171,
+ OP_FNTNUM63=234, OP_PRE=247, OP_POST=248, OP_POSTPOST=249, OP_DIR=255, DVI_FILL=223;
+
+ public:
+ explicit BasicDVIReader (std::istream &is);
+ virtual void executeAllPages ();
+ virtual void executeFontDefs ();
+ virtual double getXPos () const {return 0;}
+ virtual double getYPos () const {return 0;}
+ virtual void finishLine () {}
+ virtual void translateToX (double x) {}
+ virtual void translateToY (double y) {}
+ virtual int stackDepth () const {return 0;}
+ virtual Matrix getPageTransformation () const {return Matrix(1);}
+ virtual unsigned currentPageNumber () const {return 0;}
+
+ protected:
+ void setDVIVersion (DVIVersion version);
+ DVIVersion getDVIVersion () const {return _dviVersion;}
+ virtual int evalCommand (CommandHandler &handler, int &param);
+ virtual int executeCommand ();
+ void executePreamble ();
+ void executePostamble ();
+ void executePostPost ();
+ void goToPostamble ();
+ std::vector<uint32_t> collectBopOffsets ();
+ bool evalXDVOpcode (int op, CommandHandler &handler) const;
+
+ // The following template methods represent the single DVI commands. They
+ // must read the correct chunk of data from the input stream in order to
+ // process the DVI file correctly.
+ virtual void cmdSetChar0 (int c);
+ virtual void cmdSetChar (int len);
+ virtual void cmdPutChar (int len);
+ virtual void cmdSetRule (int len);
+ virtual void cmdPutRule (int len);
+ virtual void cmdNop (int len);
+ virtual void cmdBop (int len);
+ virtual void cmdEop (int len);
+ virtual void cmdPush (int len);
+ virtual void cmdPop (int len);
+ virtual void cmdDir (int len);
+ virtual void cmdRight (int len);
+ virtual void cmdDown (int len);
+ virtual void cmdX0 (int len);
+ virtual void cmdY0 (int len);
+ virtual void cmdW0 (int len);
+ virtual void cmdZ0 (int len);
+ virtual void cmdX (int len);
+ virtual void cmdY (int len);
+ virtual void cmdW (int len);
+ virtual void cmdZ (int len);
+ virtual void cmdFontDef (int len);
+ virtual void cmdFontNum0 (int n);
+ virtual void cmdFontNum (int len);
+ virtual void cmdXXX (int len);
+ virtual void cmdPre (int len);
+ virtual void cmdPost (int len);
+ virtual void cmdPostPost (int len);
+ virtual void cmdXFontDef (int len); // XDV only
+ virtual void cmdXGlyphArray (int len); // XDV only
+ virtual void cmdXGlyphString (int len); // XDV version 5 only
+ virtual void cmdXPic (int len); // XDV version 5 only
+ virtual void cmdXTextAndGlyphs (int len); // XDV version 7 only
+
+ private:
+ DVIVersion _dviVersion; ///< DVI version of file being processed
+};
+
+#endif