TEST(Base64, Single) {
EXPECT_EQ(62, htp_base64_decode_single('+'));
EXPECT_EQ(63, htp_base64_decode_single('/'));
EXPECT_EQ(-1, htp_base64_decode_single(','));
EXPECT_EQ(-1, htp_base64_decode_single(0));
EXPECT_EQ(-1, htp_base64_decode_single('~'));
EXPECT_EQ(26, htp_base64_decode_single('a'));
EXPECT_EQ(0, htp_base64_decode_single('A'));
}
/**
* Feed the supplied memory range to the decoder.
*
* @param[in] decoder
* @param[in] _code_in
* @param[in] length_in
* @param[in] _plaintext_out
* @param[in] length_out
* @return how many bytes were placed into plaintext output
*/
int htp_base64_decode(htp_base64_decoder *decoder, const void *_code_in, int length_in, void *_plaintext_out, int length_out) {
const unsigned char *code_in = (const unsigned char *)_code_in;
unsigned char *plaintext_out = (unsigned char *)_plaintext_out;
const unsigned char *codechar = code_in;
unsigned char *plainchar = plaintext_out;
signed char fragment;
if (length_out <= 0) return 0;
*plainchar = decoder->plainchar;
switch (decoder->step) {
while (1) {
case step_a:
do {
if (codechar == code_in + length_in) {
decoder->step = step_a;
decoder->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char) htp_base64_decode_single(*codechar++);
} while (fragment < 0);
*plainchar = (fragment & 0x03f) << 2;
case step_b:
do {
if (codechar == code_in + length_in) {
decoder->step = step_b;
decoder->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char) htp_base64_decode_single(*codechar++);
} while (fragment < 0);
*plainchar++ |= (fragment & 0x030) >> 4;
*plainchar = (fragment & 0x00f) << 4;
if (--length_out == 0) {
return plainchar - plaintext_out;
}
case step_c:
do {
if (codechar == code_in + length_in) {
decoder->step = step_c;
decoder->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char) htp_base64_decode_single(*codechar++);
} while (fragment < 0);
*plainchar++ |= (fragment & 0x03c) >> 2;
*plainchar = (fragment & 0x003) << 6;
if (--length_out == 0) {
return plainchar - plaintext_out;
}
case step_d:
do {
if (codechar == code_in + length_in) {
decoder->step = step_d;
decoder->plainchar = *plainchar;
return plainchar - plaintext_out;
}
fragment = (char) htp_base64_decode_single(*codechar++);
} while (fragment < 0);
*plainchar++ |= (fragment & 0x03f);
if (--length_out == 0) {
return plainchar - plaintext_out;
}
}
}
/* control should not reach here */
return plainchar - plaintext_out;
}