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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 ¶m);
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
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