158 lines
4.7 KiB
C++
158 lines
4.7 KiB
C++
/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2019, Libre Space Foundation <http://libre.space>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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base64.cpp and base64.h
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base64 encoding and decoding with C++.
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Version: 1.01.00
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Copyright (C) 2004-2017 René Nyffenegger
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This source code is provided 'as-is', without any express or implied
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warranty. In no event will the author be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this source code must not be misrepresented; you must not
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claim that you wrote the original source code. If you use this source code
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original source code.
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3. This notice may not be removed or altered from any source distribution.
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René Nyffenegger rene.nyffenegger@adp-gmbh.ch
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*/
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#ifndef INCLUDE_SATNOGS_BASE64_H_
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#define INCLUDE_SATNOGS_BASE64_H_
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#include <iostream>
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static const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static inline bool
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is_base64(unsigned char c)
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{
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return (isalnum(c) || (c == '+') || (c == '/'));
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}
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static std::string
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base64_encode(unsigned char const *bytes_to_encode, unsigned int in_len)
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{
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std::string ret;
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int i = 0;
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int j = 0;
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unsigned char char_array_3[3];
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unsigned char char_array_4[4];
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while (in_len--) {
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char_array_3[i++] = *(bytes_to_encode++);
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if (i == 3) {
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char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
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char_array_4[1] = ((char_array_3[0] & 0x03) << 4)
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+ ((char_array_3[1] & 0xf0) >> 4);
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char_array_4[2] = ((char_array_3[1] & 0x0f) << 2)
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+ ((char_array_3[2] & 0xc0) >> 6);
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char_array_4[3] = char_array_3[2] & 0x3f;
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for (i = 0; (i < 4); i++) {
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ret += base64_chars[char_array_4[i]];
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}
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i = 0;
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}
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}
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if (i) {
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for (j = i; j < 3; j++) {
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char_array_3[j] = '\0';
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}
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char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
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char_array_4[1] = ((char_array_3[0] & 0x03) << 4)
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+ ((char_array_3[1] & 0xf0) >> 4);
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char_array_4[2] = ((char_array_3[1] & 0x0f) << 2)
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+ ((char_array_3[2] & 0xc0) >> 6);
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for (j = 0; (j < i + 1); j++) {
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ret += base64_chars[char_array_4[j]];
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}
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while ((i++ < 3)) {
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ret += '=';
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}
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}
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return ret;
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}
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static std::string
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base64_decode(std::string const &encoded_string)
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{
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size_t in_len = encoded_string.size();
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int i = 0;
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int j = 0;
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int in_ = 0;
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unsigned char char_array_4[4], char_array_3[3];
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std::string ret;
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while (in_len-- && (encoded_string[in_] != '=')
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&& is_base64(encoded_string[in_])) {
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char_array_4[i++] = encoded_string[in_];
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in_++;
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if (i == 4) {
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for (i = 0; i < 4; i++) {
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char_array_4[i] = base64_chars.find(char_array_4[i]) & 0xff;
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}
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char_array_3[0] = (char_array_4[0] << 2)
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+ ((char_array_4[1] & 0x30) >> 4);
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char_array_3[1] = ((char_array_4[1] & 0xf) << 4)
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+ ((char_array_4[2] & 0x3c) >> 2);
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char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
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for (i = 0; (i < 3); i++) {
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ret += char_array_3[i];
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}
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i = 0;
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}
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}
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if (i) {
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for (j = 0; j < i; j++) {
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char_array_4[j] = base64_chars.find(char_array_4[j]) & 0xff;
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}
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char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
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char_array_3[1] = ((char_array_4[1] & 0xf) << 4)
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+ ((char_array_4[2] & 0x3c) >> 2);
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for (j = 0; (j < i - 1); j++) {
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ret += char_array_3[j];
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}
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}
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return ret;
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}
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#endif /* INCLUDE_SATNOGS_BASE64_H_ */
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