Function base64_decode_using_maps

ccan/ccan/base64/base64.c:175–204

}

ssize_t base64_decode_using_maps(const base64_maps_t *maps,
				 char *dest, const size_t destlen,
				 const char *src, const size_t srclen)
{
	ssize_t dest_offset = 0;
	ssize_t i;
	ssize_t more;

	if (destlen < base64_decoded_length(srclen)) {
		errno = EOVERFLOW;
		return -1;
	}

	for(i=0; srclen - i > 4; i+=4) {
		if (base64_decode_quartet_using_maps(maps, &dest[dest_offset], &src[i]) == -1) {
			return -1;
		}
		dest_offset += 3;
	}

	more = base64_decode_tail_using_maps(maps, &dest[dest_offset], &src[i], srclen - i);
	if (more == -1) {
		return -1;
	}
	dest_offset += more;

	memset(&dest[dest_offset], '\0', destlen-dest_offset);

	return dest_offset;
}