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 /// Struct is a representation of a mutable `Flatbuffers` struct 24 /// since native structs are value types and cant be mutated 25 @frozen 26 public struct Struct { 27 28 /// Hosting Bytebuffer 29 public private(set) var bb: ByteBuffer 30 /// Current position of the struct 31 public private(set) var postion: Int32 32 33 /// Initializer for a mutable flatbuffers struct 34 /// - Parameters: 35 /// - bb: Current hosting Bytebuffer 36 /// - position: Current position for the struct in the ByteBuffer 37 public init(bb: ByteBuffer, position: Int32 = 0) { 38 self.bb = bb 39 postion = position 40 } 41 42 /// Reads data from the buffer directly at offset O 43 /// - Parameters: 44 /// - type: Type of data to be read 45 /// - o: Current offset of the data 46 /// - Returns: Data of Type T that conforms to type Scalar readBuffer<T: Scalar>null47 public func readBuffer<T: Scalar>(of type: T.Type, at o: Int32) -> T { 48 let r = bb.read(def: T.self, position: Int(o + postion)) 49 return r 50 } 51 } 52