Function get_var_int

reftable/record.c:22–54

static void *reftable_record_data(struct reftable_record *rec);

int get_var_int(uint64_t *dest, struct string_view *in)
{
	const unsigned char *buf = in->buf;
	unsigned char c;
	uint64_t val;

	if (!in->len)
		return -1;
	c = *buf++;
	val = c & 0x7f;

	while (c & 0x80) {
		/*
		 * We use a micro-optimization here: whenever we see that the
		 * 0x80 bit is set, we know that the remainder of the value
		 * cannot be 0. The zero-values thus doesn't need to be encoded
		 * at all, which is why we subtract 1 when encoding and add 1
		 * when decoding.
		 *
		 * This allows us to save a byte in some edge cases.
		 */
		val += 1;
		if (!val || (val & (uint64_t)(~0ULL << (64 - 7))))
			return -1; /* overflow */
		if (buf >= in->buf + in->len)
			return -1;
		c = *buf++;
		val = (val << 7) + (c & 0x7f);
	}

	*dest = val;
	return buf - in->buf;
}

int put_var_int(struct string_view *dest, uint64_t value)
{