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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
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