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if (srclen-- == 0) {
ret = 1;
break;
}
if ((q = plain32_base64_table_dec[*c++]) >= 254) {
st.eof = 1;
// Treat character '=' as invalid for byte 0:
break;
}
st.carry = q << 2;
st.bytes++;
case 1: if (srclen-- == 0) {
ret = 1;
break;
}
if ((q = plain32_base64_table_dec[*c++]) >= 254) {
st.eof = 1;
// Treat character '=' as invalid for byte 1:
break;
}
*o++ = st.carry | (q >> 4);
st.carry = q << 4;
st.bytes++;
outl++;
case 2: if (srclen-- == 0) {
ret = 1;
break;
}
if ((q = plain32_base64_table_dec[*c++]) >= 254) {
st.eof = 1;
// When q == 254, the input char is '='. Return 1 and EOF.
// Technically, should check if next byte is also '=', but never mind.
// When q == 255, the input char is invalid. Return 0 and EOF.
ret = (q == 254) ? 1 : 0;
break;
}
*o++ = st.carry | (q >> 2);
st.carry = q << 6;
st.bytes++;
outl++;
case 3: if (srclen-- == 0) {
ret = 1;
break;
}
if ((q = plain32_base64_table_dec[*c++]) >= 254) {
st.eof = 1;
// When q == 254, the input char is '='. Return 1 and EOF.
// When q == 255, the input char is invalid. Return 0 and EOF.
ret = (q == 254) ? 1 : 0;
break;
}
*o++ = st.carry | q;
st.carry = 0;
st.bytes = 0;
outl++;
}
}
state->eof = st.eof;
state->bytes = st.bytes;
state->carry = st.carry;
*outlen = outl;
return ret;
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