Function base64_decode

example/plugins/c-api/basic_auth/basic_auth.cc:36–70

static char base64_codes[256];

static char *
base64_decode(const char *input)
{
#define decode(A) ((unsigned int)base64_codes[(int)input[A]])

  char *output;
  char *obuf;
  int   len;

  for (len = 0; (input[len] != '\0') && (input[len] != '='); len++) {
    ;
  }

  output = obuf = static_cast<char *>(TSmalloc((len * 6) / 8 + 3));

  while (len > 0) {
    *output++  = decode(0) << 2 | decode(1) >> 4;
    *output++  = decode(1) << 4 | decode(2) >> 2;
    *output++  = decode(2) << 6 | decode(3);
    len       -= 4;
    input     += 4;
  }

  /*
   * We don't need to worry about leftover bits because
   * we've allocated a few extra characters and if there
   * are leftover bits they will be zeros because the extra
   * inputs will be '='s and '=' decodes to 0.
   */

  *output = '\0';
  return obuf;

#undef decode
}

static int
authorized(char *user, char *password)