Base64解码，编码

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//////  CrossAppx////  Created by kevin on 15-1-29.//  Copyright (c) 2014 http://9miao.com All rights reserved.//#pragma once#include "CrossApp.h"#include <iostream>#include <stdio.h>#include <string>using namespace std;class MyBase64{public:MyBase64(void);~MyBase64(void);static inline bool is_Base64(unsigned char c) {return (isalnum(c) || (c == '+') || (c == '/'));}static std::string Base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len);static std::string Base64_decode(std::string const& encoded_string);};

//////  CrossAppx////  Created by kevin on 15-1-29.//  Copyright (c) 2014 http://9miao.com All rights reserved.//#include "MyBase64.h"MyBase64::MyBase64(void){}MyBase64::~MyBase64(void) {}std::string MyBase64::Base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {std::string MyBase64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";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 += MyBase64_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 += MyBase64_chars[char_array_4[j]];while ((i++ < 3))ret += '=';}return ret;}std::string MyBase64::Base64_decode(std::string const& encoded_string) {std::string MyBase64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";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] = MyBase64_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] = MyBase64_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;}

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