add swift flatbuffers

flatbuffers/VeriferOptions.swift

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2023 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if !os(WASI)
+import Foundation
+#else
+import SwiftOverlayShims
+#endif
+
+/// `VerifierOptions` is a set of options to verify a flatbuffer
+public struct VerifierOptions {
+
+  /// Maximum `Apparent` size if the buffer can be expanded into a DAG tree
+  internal var _maxApparentSize: UOffset
+
+  /// Maximum table count allowed in a buffer
+  internal var _maxTableCount: UOffset
+
+  /// Maximum depth allowed in a buffer
+  internal var _maxDepth: UOffset
+
+  /// Ignoring missing null terminals in strings
+  internal var _ignoreMissingNullTerminators: Bool
+
+  /// initializes the set of options for the verifier
+  /// - Parameters:
+  ///   - maxDepth: Maximum depth allowed in a buffer
+  ///   - maxTableCount: Maximum table count allowed in a buffer
+  ///   - maxApparentSize: Maximum `Apparent` size if the buffer can be expanded into a DAG tree
+  ///   - ignoreMissingNullTerminators: Ignoring missing null terminals in strings *Currently not supported in swift*
+  public init(
+    maxDepth: UOffset = 64,
+    maxTableCount: UOffset = 1000000,
+    maxApparentSize: UOffset = 1 << 31,
+    ignoreMissingNullTerminators: Bool = false)
+  {
+    _maxDepth = maxDepth
+    _maxTableCount = maxTableCount
+    _maxApparentSize = maxApparentSize
+    _ignoreMissingNullTerminators = ignoreMissingNullTerminators
+  }
+
+}