Fix arithmetic overflow crash in request pagination (#637)

* fix: Fix overflow crash in request pagination

Author: petrpavlik

Sources/FluentKit/Query/Builder/QueryBuilder+Paginate.swift

@@ -136,10 +136,10 @@ public struct PageRequest: Decodable, Sendable {
     }
 
     var start: Int {
-        (self.page - 1) * self.per
+        (self.page - 1) &* self.per
     }
 
     var end: Int {
-        self.page * self.per
+        self.page &* self.per
     }
 }

Tests/FluentKitTests/FluentKitTests.swift

@@ -717,6 +717,18 @@ final class FluentKitTests: XCTestCase {
             .wait())
     }
 
+    func testPaginationDoesntCrashOnOverflow() async throws {
+        let db = DummyDatabaseForTestSQLSerializer()
+        let pageRequest1 = PageRequest(page: 1184467440737095516, per: 1184467440737095516)
+        db.fakedRows.append([.init(["aggregate": 1])])
+        let result = try await Planet2
+            .query(on: db)
+            .paginate(pageRequest1)
+        XCTAssertEqual(result.metadata.page, 1184467440737095516)
+        XCTAssertEqual(result.metadata.per, 1184467440737095516)
+        XCTAssertEqual(result.metadata.total, 1)
+    }
+    
     func testModelsWithSpacesSpecified() throws {
         let db = DummyDatabaseForTestSQLSerializer()
         try db.schema(AltPlanet.schema, space: AltPlanet.space)