1 changed files with 122 additions and 0 deletions
@ -0,0 +1,122 @@ |
|||||
|
/**
|
||||
|
* Copyright (c) 2017 Baidu.com, Inc. All Rights Reserved |
||||
|
* |
||||
|
* Licensed 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. |
||||
|
* |
||||
|
* @author baidu aip |
||||
|
*/ |
||||
|
#ifndef __AIP_BASE64_H__
|
||||
|
#define __AIP_BASE64_H__
|
||||
|
|
||||
|
#include <iostream>
|
||||
|
#include <string>
|
||||
|
|
||||
|
namespace iflytop { |
||||
|
|
||||
|
static const std::string base64_chars = |
||||
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
||||
|
"abcdefghijklmnopqrstuvwxyz" |
||||
|
"0123456789+/"; |
||||
|
|
||||
|
static inline bool is_base64(const char c) { return (isalnum(c) || (c == '+') || (c == '/')); } |
||||
|
|
||||
|
static inline std::string base64_encode(const char* 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; |
||||
|
} |
||||
|
|
||||
|
static inline std::vector<uint8_t> base64_decode(std::string const& encoded_string) { |
||||
|
int in_len = (int)encoded_string.size(); |
||||
|
int i = 0; |
||||
|
int j = 0; |
||||
|
int in_ = 0; |
||||
|
unsigned char char_array_4[4], char_array_3[3]; |
||||
|
std::vector<uint8_t> 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];
|
||||
|
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] = 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];
|
||||
|
ret.push_back(char_array_3[j]); |
||||
|
} |
||||
|
} |
||||
|
|
||||
|
return ret; |
||||
|
} |
||||
|
|
||||
|
} // namespace iflytop
|
||||
|
#endif
|
Write
Preview
Loading…
Cancel
Save
Reference in new issue