URLEncode.cpp

/* CommonLibs/URLEncode.cpp */
/*-
 * Copyright 2011, 2014 Range Networks, Inc.
 *
 * This software is distributed under the terms of the GNU Affero Public License.
 * See the COPYING file in the main directory for details.
 *
 * This use of this software may be subject to additional restrictions.
 * See the LEGAL file in the main directory for details.
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

#include <ctype.h>
#include <string.h>

#include "URLEncode.h"

using namespace std;

// based on javascript encodeURIComponent()
string URLEncode(const string &c)
{
	static const char *digits = "01234567890ABCDEF";
	string retVal = "";
	for (size_t i = 0; i < c.length(); i++) {
		const char ch = c[i];
		if (isalnum(ch) || strchr("-_.!~'()", ch)) {
			retVal += ch;
		} else {
			retVal += '%';
			retVal += digits[(ch >> 4) & 0x0f];
			retVal += digits[ch & 0x0f];
		}
	}
	return retVal;
}