Function decode_85

base85.c:40–77

}

int decode_85(char *dst, const char *buffer, int len)
{
	prep_base85();

	say2("decode 85 <%.*s>", len / 4 * 5, buffer);
	while (len) {
		unsigned acc = 0;
		int de, cnt = 4;
		unsigned char ch;
		do {
			ch = *buffer++;
			de = de85[ch];
			if (--de < 0)
				return error("invalid base85 alphabet %c", ch);
			acc = acc * 85 + de;
		} while (--cnt);
		ch = *buffer++;
		de = de85[ch];
		if (--de < 0)
			return error("invalid base85 alphabet %c", ch);
		/* Detect overflow. */
		if (0xffffffff / 85 < acc ||
		    0xffffffff - de < (acc *= 85))
			return error("invalid base85 sequence %.5s", buffer-5);
		acc += de;
		say1(" %08x", acc);

		cnt = (len < 4) ? len : 4;
		len -= cnt;
		do {
			acc = (acc << 8) | (acc >> 24);
			*dst++ = acc;
		} while (--cnt);
	}
	say("\n");

	return 0;
}

void encode_85(char *buf, const unsigned char *data, int bytes)
{