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+/*************************************************************************
+** utility.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2017 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 UTILITY_HPP
+#define UTILITY_HPP
+
+#include <string>
+
+namespace util {
+
+std::string trim (const std::string &str, const char *ws=" \t\n\r\f");
+std::string normalize_space (std::string str, const char *ws=" \t\n\r\f");
+std::string& tolower (std::string &str);
+int ilog10 (int n);
+
+
+/** Encodes the bytes in the half-open range [first,last) to Base64 and writes
+ * the result to the range starting at 'dest'.
+ * @param[in] first initial position of the range to be encoded
+ * @param[in] last final position of the range to be encoded
+ * @param[in] dest first position of the destination range */
+template <typename InputIterator, typename OutputIterator>
+void base64_copy (InputIterator first, InputIterator last, OutputIterator dest) {
+ static const char *base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ while (first != last) {
+ int padding = 0;
+ unsigned char c0 = *first++, c1=0, c2=0;
+ if (first == last)
+ padding = 2;
+ else {
+ c1 = *first++;
+ if (first == last)
+ padding = 1;
+ else
+ c2 = *first++;
+ }
+ uint32_t n = (c0 << 16) | (c1 << 8) | c2;
+ for (int i=0; i <= 3-padding; i++) {
+ *dest++ = base64_chars[(n >> 18) & 0x3f];
+ n <<= 6;
+ }
+ while (padding--)
+ *dest++ = '=';
+ }
+}
+
+} // namespace util
+
+#endif