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/*************************************************************************
** PDFToSVG.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 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 <cstdlib>
#include "Message.hpp"
#include "PDFToSVG.hpp"
using namespace std;
PDFToSVG::PDFToSVG (const string &fname, SVGOutputBase &out) : ImageToSVG(fname, out) {
_useGS = (gsVersion() > 0 && gsVersion() < 10010);
if (const char *pdfproc = getenv("DVISVGM_PDF_PROC")) {
if (strcmp(pdfproc, "gs") == 0)
_useGS = true;
else if (strcmp(pdfproc, "mutool") == 0)
_useGS = false;
}
if (!_useGS)
_pdfHandler.assignSVGTree(_svg);
}
void PDFToSVG::checkGSAndFileFormat () {
if (_useGS)
ImageToSVG::checkGSAndFileFormat();
else {
if (!PDFHandler::available()) {
ostringstream oss;
if (gsVersion() > 0) {
oss << "To process PDF files, either Ghostscript < 10.01.0 or mutool is required.\n";
oss << "The installed Ghostscript version " << Ghostscript().revisionstr() << " isn't supported.\n";
throw MessageException(oss.str());
}
}
}
if (!imageIsValid())
throw MessageException("invalid "+imageFormat()+" file");
}
/** Returns the total number of pages in the PDF file. */
int PDFToSVG::totalPageCount () const {
if (_totalPageCount < 0) {
if (_useGS)
_totalPageCount = psInterpreter().pdfPageCount(filename());
else
_totalPageCount = PDFHandler::numberOfPages(filename());
if (_totalPageCount < 1)
throw MessageException("can't retrieve number of pages from file " + filename());
}
return _totalPageCount;
}
bool PDFToSVG::imageIsValid () const {
ifstream ifs(filename());
if (ifs) {
char buf[16];
ifs.getline(buf, 16);
return std::strncmp(buf, "%PDF-1.", 7) == 0;
}
return false;
}
void PDFToSVG::convert (int pageno) {
if (_useGS)
ImageToSVG::convert(pageno);
else {
Message::mstream().indent(0);
Message::mstream(false, Message::MC_PAGE_NUMBER) << "processing PDF file\n";
Message::mstream().indent(1);
_pdfHandler.convert(filename(), pageno);
embed(_pdfHandler.bbox());
writeSVG(pageno);
}
}
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