0x0 Base64介绍
Base64用于二进制转为字符串，编码后空间大1/3左右。
0x1 代码实现
h文件
class Base64Crypt {
public:
static int Encode(const std::string& input, std::string& output);
static int Decode(const std::string& input, std::string& output);
};
cpp文件
int Base64Crypt::Decode(const std::string &input, std::string &output) {
if (input.empty())
return -1;
BIO* b64 = BIO_new(BIO_f_base64());
if (b64) {
int buf_len = input.length();
char* buf = new char[buf_len];
if (buf) {
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
BIO* bmem = BIO_new_mem_buf(const_cast<char*>(input.c_str()), input.length());
if (bmem) {
bmem = BIO_push(b64, bmem);
int len = BIO_read(bmem, buf, buf_len);
if (len > 0)
output = std::string(buf, len);
}
delete[] buf;
}
BIO_free_all(b64);
}
return 0;
}
int Base64Crypt::Encode(const std::string &input, std::string &output) {
if (input.empty())
return -1;
BIO* b64 = BIO_new(BIO_f_base64());
if (b64) {
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
BIO* bmem = BIO_new(BIO_s_mem());
if (bmem) {
b64 = BIO_push(b64, bmem);
BIO_write(b64, input.c_str(), input.length());
BIO_flush(b64);
BUF_MEM* buf_mem = NULL;
BIO_get_mem_ptr(b64, &buf_mem);
if (buf_mem)
output = std::string(buf_mem->data, buf_mem->length);
}
BIO_free_all(b64);
}
return 0;
}
