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/*************************************************************************
** EPSFile.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 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 <array>
#include <cstring>
#include <istream>
#include <limits>
#include "EPSFile.hpp"
#include "InputBuffer.hpp"
#include "InputReader.hpp"
using namespace std;
/** Reads a little-endian 32-bit integer from the given input stream. */
static uint32_t getUInt32 (istream &is) {
uint32_t value=0;
char buf[4];
is.read(buf, 4);
for (int i=0; i < 4; i++)
value |= ((buf[i] & 255) << (8*i));
return value;
}
static size_t getline (istream &is, char *line, size_t n) {
char buf[512];
is.get(buf, min(n, (size_t)512)-1);
n = is.gcount();
size_t linelen=0;
for (size_t i=0; i < n; i++)
if (isprint(buf[i]))
line[linelen++] = buf[i];
line[linelen] = 0;
if (is.peek() == '\n')
is.get();
else
is.ignore(numeric_limits<size_t>::max(), '\n');
return linelen;
}
EPSFile::EPSFile (const string &fname) : _ifs(fname, ios::binary) {
if (_ifs) {
if (getUInt32(_ifs) != 0xC6D3D0C5) // no binary header present?
_ifs.seekg(0); // go back to the first byte
else {
_offset = getUInt32(_ifs); // stream offset where PS part of the file begins
_pslength = getUInt32(_ifs); // length of PS section in bytes
_ifs.seekg(_offset); // continue reading at the beginning of the PS section
}
string str;
str += char(_ifs.get());
str += char(_ifs.get());
_headerValid = (str == "%!");
_ifs.seekg(0);
}
}
/** Returns an input stream for the EPS file. The stream pointer is automatically moved
* to the beginning of the ASCII (PostScript) part of the file. */
istream& EPSFile::istream () const {
_ifs.clear();
_ifs.seekg(_offset);
return _ifs;
}
/** Extracts the bounding box information from the DSC header/footer (if present).
* @return the extracted bounding box */
BoundingBox EPSFile::bbox () const {
BoundingBox box;
std::istream &is = EPSFile::istream();
if (is) {
char buf[64];
while (is) {
size_t linelen = getline(is, buf, 64);
if (strncmp(buf, "%%BoundingBox:", 14) == 0) {
CharInputBuffer ib(buf, linelen);
BufferInputReader ir(ib);
ir.skip(14);
ir.skipSpace();
if (!ir.check("(atend)", true)) {
array<int, 4> values;
for (int &v : values) {
ir.skipSpace();
ir.parseInt(v);
}
box = BoundingBox(values[0], values[1], values[2], values[3]);
break;
}
}
}
}
return box;
}
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