Function decode_b_segment

mailinfo.c:414–453

}

static int decode_b_segment(struct strbuf *out, const struct strbuf *b_seg)
{
	/* Decode in..ep, possibly in-place to ot */
	int c, pos = 0, acc = 0;
	const char *in = b_seg->buf;
	strbuf_grow(out, b_seg->len);

	while ((c = *in++) != 0) {
		if (c == '+')
			c = 62;
		else if (c == '/')
			c = 63;
		else if ('A' <= c && c <= 'Z')
			c -= 'A';
		else if ('a' <= c && c <= 'z')
			c -= 'a' - 26;
		else if ('0' <= c && c <= '9')
			c -= '0' - 52;
		else
			continue; /* garbage */
		switch (pos++) {
		case 0:
			acc = (c << 2);
			break;
		case 1:
			strbuf_addch(out, (acc | (c >> 4)));
			acc = (c & 15) << 4;
			break;
		case 2:
			strbuf_addch(out, (acc | (c >> 2)));
			acc = (c & 3) << 6;
			break;
		case 3:
			strbuf_addch(out, (acc | c));
			acc = pos = 0;
			break;
		}
	}
	return 0;
}

static int convert_to_utf8(struct mailinfo *mi,
			   struct strbuf *line, const char *charset)