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/*
* This file is part of gerbolyze, a vector image preprocessing toolchain
* Copyright (C) 2021 Jan Sebastian Götte <gerbolyze@jaseg.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <cmath>
#include "base64.h"
#include "svg_import_util.h"
using namespace std;
/* Read a double value formatted like usvg formats doubles from an SVG attribute */
double gerbolyze::usvg_double_attr(const pugi::xml_node &node, const char *attr, double default_value) {
const auto *val = node.attribute(attr).value();
if (*val == '\0')
return default_value;
return atof(val);
}
/* Read an url from an usvg attribute */
string gerbolyze::usvg_id_url(string attr) {
if (attr.rfind("url(#", 0) == string::npos)
return string();
attr = attr.substr(strlen("url(#"));
attr = attr.substr(0, attr.size()-1);
return attr;
}
gerbolyze::RelativeUnits gerbolyze::map_str_to_units(string str, gerbolyze::RelativeUnits default_val) {
if (str == "objectBoundingBox")
return SVG_ObjectBoundingBox;
else if (str == "userSpaceOnUse")
return SVG_UserSpaceOnUse;
return default_val;
}
/* Cf. https://tools.ietf.org/html/rfc2397 */
string gerbolyze::parse_data_iri(const string &data_url) {
if (data_url.rfind("data:", 0) == string::npos) /* check if url starts with "data:" */
return string();
size_t foo = data_url.find("base64,");
if (foo == string::npos) /* check if this is actually a data URL */
return string();
size_t b64_begin = data_url.find_first_not_of(" ", foo + strlen("base64,"));
assert(b64_begin != string::npos);
bool err_out;
string out = base64_decode(data_url.substr(b64_begin), false, &err_out);
if (err_out)
return "";
return out;
}
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