Function cdb_val_decode

modules/sql_cacher/sql_cacher.c:1522–1587

return: * 0 - succes * 1 - succes, null value in db * 2 - error * 3 - does not match reload version (old value) */

 *  3 - does not match reload version (old value)
 */
static int cdb_val_decode(const pv_name_fix_t *pv_name, const str *cdb_val, int reload_version,
							str *str_res, int *int_res)
{
	int int_val, next_str_off, i, rc;
	char int_buf[calc_max_base64_decode_len(INT_B64_ENC_LEN)];
	const char zeroes[INT_B64_ENC_LEN] = {0};

	if (pv_name->col_offset == -1) {
		LM_WARN("Unknown column %.*s\n", pv_name->col.len, pv_name->col.s);
		return 2;
	}

	/* decode the reload version */
	if (base64decode((unsigned char *)int_buf,
		(unsigned char *)(cdb_val->s), INT_B64_ENC_LEN) != 4)
		goto error;
	memcpy(&int_val, int_buf, 4);

	if (reload_version != int_val)
		return 3;

	/* null integer value in db */
	if (!memcmp(cdb_val->s + pv_name->col_offset, zeroes, INT_B64_ENC_LEN))
		return 1;

	/* decode the integer value or the offset of the string value */
	if (base64decode((unsigned char *)int_buf,
		(unsigned char *)(cdb_val->s + pv_name->col_offset), INT_B64_ENC_LEN) != 4)
		goto error;
	memcpy(&int_val, int_buf, 4);

	if (is_str_column(pv_name)) {
		/* null string value in db */
		if (int_val == 0)
			return 1;

		str_res->s = cdb_val->s + int_val;
		if (pv_name->last_str)
			str_res->len = cdb_val->len - int_val;
		else {
			/* calculate the length of the current string using the offset of the next not null string */
			i = 1;
			do {
				rc = base64decode((unsigned char *)int_buf, (unsigned char *)(cdb_val->s +
					pv_name->col_offset + i * INT_B64_ENC_LEN), INT_B64_ENC_LEN);
				if (rc != 4)
					goto error;
				memcpy(&next_str_off, int_buf, 4);
				i++;
			} while (next_str_off == 0 && pv_name->col_offset + i*INT_B64_ENC_LEN <
						(pv_name->c_entry->nr_columns + 1) * INT_B64_ENC_LEN);

			if (next_str_off == 0)
				str_res->len = cdb_val->len - int_val;
			else
				str_res->len = next_str_off - int_val;
		}
	} else {