shims/qpid-proton-cpp/src/qpidit/Base64.cpp (81 lines of code) (raw):

/* * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * */ /* * Based on René Nyffenegger rene.nyffenegger@adp-gmbh.ch * https://renenyffenegger.ch/notes/development/Base64/Encoding-and-decoding-base-64-with-cpp/ */ #include "Base64.hpp" #include <iostream> static const std::string b64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static inline bool is_base64(uint8_t c) { return (isalnum(c) || (c == '+') || (c == '/')); } std::string b64_encode(proton::binary const& str_buf) { uint8_t const* buf = &str_buf[0]; uint16_t bufLen = str_buf.size(); std::string ret; int i = 0; int j = 0; uint8_t char_array_3[3]; uint8_t char_array_4[4]; while (bufLen--) { char_array_3[i++] = *(buf++); if (i == 3) { char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); char_array_4[3] = char_array_3[2] & 0x3f; for(i = 0; (i <4) ; i++) { ret += b64_chars[char_array_4[i]]; } i = 0; } } if (i) { for(j = i; j < 3; j++) { char_array_3[j] = '\0'; } char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); char_array_4[3] = char_array_3[2] & 0x3f; for (j = 0; (j < i + 1); j++) { ret += b64_chars[char_array_4[j]]; } while((i++ < 3)) ret += '='; } return ret; } proton::binary b64_decode(std::string const& encoded_string) { int in_len = encoded_string.size(); int i = 0; int j = 0; int in_ = 0; uint8_t char_array_4[4], char_array_3[3]; proton::binary ret; while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) { char_array_4[i++] = encoded_string[in_]; in_++; if (i ==4) { for (i = 0; i <4; i++) { char_array_4[i] = b64_chars.find(char_array_4[i]); } char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; for (i = 0; (i < 3); i++) { ret.push_back(char_array_3[i]); } i = 0; } } if (i) { for (j = i; j <4; j++) { char_array_4[j] = 0; } for (j = 0; j <4; j++) { char_array_4[j] = b64_chars.find(char_array_4[j]); } char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3]; for (j = 0; (j < i - 1); j++) { ret.push_back(char_array_3[j]); } } return ret; }