1 /* 2 * Copyright 2021 Google Inc. All rights reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #if !os(WASI) 18 import Foundation 19 #else 20 import SwiftOverlayShims 21 #endif 22 23 /// FlatBuffersUtils hosts some utility functions that might be useful 24 public enum FlatBuffersUtils { 25 26 /// Gets the size of the prefix 27 /// - Parameter bb: Flatbuffer object getSizePrefixnull28 public static func getSizePrefix(bb: ByteBuffer) -> Int32 { 29 bb.read(def: Int32.self, position: bb.reader) 30 } 31 32 /// Removes the prefix by duplicating the Flatbuffer this call is expensive since its 33 /// creates a new buffer use `readPrefixedSizeCheckedRoot` instead 34 /// unless a completely new buffer is required 35 /// - Parameter bb: Flatbuffer object 36 /// 37 /// removeSizePrefixnull38 public static func removeSizePrefix(bb: ByteBuffer) -> ByteBuffer { 39 bb.duplicate(removing: MemoryLayout<Int32>.size) 40 } 41 } 42