ydb/contrib/libs/base64/plain64/dec_head.c

int ret = 0;
const uint8_t *c = (const uint8_t *)src;
uint8_t *o = (uint8_t *)out;
uint8_t q;

// Use local temporaries to avoid cache thrashing:
size_t outl = 0;
struct plain64_base64_state st;
st.eof = state->eof;
st.bytes = state->bytes;
st.carry = state->carry;

// If we previously saw an EOF or an invalid character, bail out:
if (st.eof) {
	*outlen = 0;
	return 0;
}

// Turn four 6-bit numbers into three bytes:
// out[0] = 11111122
// out[1] = 22223333
// out[2] = 33444444

// Duff's device again:
switch (st.bytes)
{
	for (;;)
	{
	case 0: