/
tail.c
65 lines (62 loc) · 1.34 KB
/
tail.c
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if (srclen-- == 0) {
ret = 1;
break;
}
if ((q = 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 = 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 = 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 = 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;