fix CBOR request length estimation (#181)

Fix a c&p error that uses the wrong parameter sizes for estimating the
length of a CBOR request.

Author: bpintea

driver/queries.c

@@ -2966,13 +2966,13 @@ static SQLRETURN statement_len_cbor(esodbc_stmt_st *stmt, size_t *enc_len,
 			(*keys) ++;
 		}
 		/* "field_multi_value_leniency": true/false */
-		bodylen += cbor_str_obj_len(sizeof(REQ_KEY_MODE) - 1);
+		bodylen += cbor_str_obj_len(sizeof(REQ_KEY_MULTIVAL) - 1);
 		bodylen += CBOR_OBJ_BOOL_LEN;
 		/* "index_include_frozen": true/false */
-		bodylen += cbor_str_obj_len(sizeof(REQ_KEY_MODE) - 1);
+		bodylen += cbor_str_obj_len(sizeof(REQ_KEY_IDX_FROZEN) - 1);
 		bodylen += CBOR_OBJ_BOOL_LEN;
 		/* "time_zone": "-05:45" */
-		bodylen += cbor_str_obj_len(sizeof(REQ_KEY_MODE) - 1);
+		bodylen += cbor_str_obj_len(sizeof(REQ_KEY_TIMEZONE) - 1);
 		bodylen += cbor_str_obj_len(tz_param.cnt); /* lax len */
 		*keys += 3; /* field_m._val., idx._inc._frozen, time_zone */
 	}

test/test_queries.cc

@@ -89,6 +89,26 @@ TEST_F(Queries, attach_error_non_sql) {
 	ASSERT_EQ(HDRH(stmt)->diag.native_code, SRC_AID3);
 }
 
+TEST_F(Queries, cbor_serialize_alloc_body) {
+	const size_t bsz = 64;
+	wchar_t buff[bsz];
+	wstr_st select = WSTR_INIT("SELECT '");
+	cstr_st body = {(SQLCHAR *)buff, /*same size as the Q: force realloc*/bsz};
+
+	/* construct a valid query, though irrelevant for the test a.t.p. */
+	wmemset(buff, L'*', bsz);
+	wmemcpy(buff, select.str, select.cnt);
+	buff[bsz - 2] = L'\'';
+	buff[bsz - 1] = L'\0';
+
+	DBCH(dbc)->pack_json = FALSE;
+	ASSERT_TRUE(SQL_SUCCEEDED(attach_sql(STMH(stmt), (SQLWCHAR *)buff,
+					bsz - 1)));
+	ASSERT_TRUE(SQL_SUCCEEDED(serialize_statement(STMH(stmt), &body)));
+	ASSERT_NE((void *)body.str, (void *)buff);
+	free(body.str);
+}
+
 TEST_F(Queries, SQLNativeSql) {
 #undef SRC_STR
 #define SRC_STR	"SELECT 1"