封装成类的 。 base64格式的字符串,只包含大小写字母、零到九,以及 + /
//___base_64.h /*base_64.h文件*/ #ifndef BASE_64_H #define BASE_64_H /** * Base64 编码/解码 * @author liruixing */ class Base64{ private: std::string _base64_table; static const char base64_pad = '=';public: Base64() { _base64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /*这是Base64编码使用的标准字典*/ } /** * 这里必须是unsigned类型,否则编码中文的时候出错 */ std::string Encode(const unsigned char * str,int bytes); std::string Decode(const char *str,int bytes); void Debug(bool open = true); }; #endif
//___base_64.cpp
/*base_64.cpp文件*/ #include <iostream> #include <string> #include <cstring> #include "base_64.h" std::string Base64::Encode(const unsigned char * str,int bytes) { int num = 0,bin = 0,i; std::string _encode_result; const unsigned char * current; current = str; while(bytes > 2) { _encode_result += _base64_table[current[0] >> 2]; _encode_result += _base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)]; _encode_result += _base64_table[((current[1] & 0x0f) << 2) + (current[2] >> 6)]; _encode_result += _base64_table[current[2] & 0x3f]; current += 3; bytes -= 3; } if(bytes > 0) { _encode_result += _base64_table[current[0] >> 2]; if(bytes%3 == 1) { _encode_result += _base64_table[(current[0] & 0x03) << 4]; _encode_result += "=="; } else if(bytes%3 == 2) { _encode_result += _base64_table[((current[0] & 0x03) << 4) + (current[1] >> 4)]; _encode_result += _base64_table[(current[1] & 0x0f) << 2]; _encode_result += "="; } } return _encode_result; } std::string Base64::Decode(const char *str,int length) { //解码表 const char DecodeTable[] = { -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -2, -2, -1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, -2, -2, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, -2, -2, -2, -2, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -2, -2, -2, -2, -2, -2, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2 }; int bin = 0,i=0,pos=0; std::string _decode_result; const char *current = str; char ch; while( (ch = *current++) != '