| // Copyright (C) 2017-2018 Baidu, Inc. All Rights Reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in |
| // the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Baidu, Inc., nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "Base64.h" |
| #include <iostream> |
| |
| static const std::string base64_chars = |
| "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| "abcdefghijklmnopqrstuvwxyz" |
| "0123456789+/"; |
| |
| |
| static inline bool is_base64(unsigned char c) { |
| return (isalnum(c) || (c == '+') || (c == '/')); |
| } |
| |
| std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) { |
| std::string ret; |
| int i = 0; |
| int j = 0; |
| unsigned char char_array_3[3]; |
| unsigned char char_array_4[4]; |
| |
| while (in_len--) { |
| char_array_3[i++] = *(bytes_to_encode++); |
| 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 += base64_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 += base64_chars[char_array_4[j]]; |
| |
| while((i++ < 3)) |
| ret += '='; |
| } |
| |
| return ret; |
| } |
| |
| |
| std::string base64_decode(std::string const& encoded_string) { |
| int in_len = encoded_string.size(); |
| int i = 0; |
| int j = 0; |
| int in_ = 0; |
| unsigned char char_array_4[4], char_array_3[3]; |
| std::string 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] = base64_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 += 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] = base64_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 += char_array_3[j]; |
| } |
| |
| return ret; |
| } |
| |