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FbConstants.swift (3092B)

      1 /*
      2  * Copyright 2023 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 #if os(Linux)
     19 import CoreFoundation
     20 #else
     21 import Foundation
     22 #endif
     23 #else
     24 import SwiftOverlayShims
     25 #endif
     26 
     27 /// A boolean to see if the system is littleEndian
     28 let isLitteEndian: Bool = {
     29   let number: UInt32 = 0x12345678
     30   return number == number.littleEndian
     31 }()
     32 /// Constant for the file id length
     33 let FileIdLength = 4
     34 /// Type aliases
     35 public typealias Byte = UInt8
     36 public typealias UOffset = UInt32
     37 public typealias SOffset = Int32
     38 public typealias VOffset = UInt16
     39 /// Maximum size for a buffer
     40 public let FlatBufferMaxSize = UInt32
     41   .max << ((MemoryLayout<SOffset>.size * 8 - 1) - 1)
     42 
     43 /// Protocol that All Scalars should conform to
     44 ///
     45 /// Scalar is used to conform all the numbers that can be represented in a FlatBuffer. It's used to write/read from the buffer.
     46 public protocol Scalar: Equatable {
     47   associatedtype NumericValue
     48   var convertedEndian: NumericValue { get }
     49 }
     50 
     51 extension Scalar where Self: Verifiable {}
     52 
     53 extension Scalar where Self: FixedWidthInteger {
     54   /// Converts the value from BigEndian to LittleEndian
     55   ///
     56   /// Converts values to little endian on machines that work with BigEndian, however this is NOT TESTED yet.
     57   public var convertedEndian: NumericValue {
     58     self as! Self.NumericValue
     59   }
     60 }
     61 
     62 extension Double: Scalar, Verifiable {
     63   public typealias NumericValue = UInt64
     64 
     65   public var convertedEndian: UInt64 {
     66     bitPattern.littleEndian
     67   }
     68 }
     69 
     70 extension Float32: Scalar, Verifiable {
     71   public typealias NumericValue = UInt32
     72 
     73   public var convertedEndian: UInt32 {
     74     bitPattern.littleEndian
     75   }
     76 }
     77 
     78 extension Bool: Scalar, Verifiable {
     79   public var convertedEndian: UInt8 {
     80     self == true ? 1 : 0
     81   }
     82 
     83   public typealias NumericValue = UInt8
     84 }
     85 
     86 extension Int: Scalar, Verifiable {
     87   public typealias NumericValue = Int
     88 }
     89 
     90 extension Int8: Scalar, Verifiable {
     91   public typealias NumericValue = Int8
     92 }
     93 
     94 extension Int16: Scalar, Verifiable {
     95   public typealias NumericValue = Int16
     96 }
     97 
     98 extension Int32: Scalar, Verifiable {
     99   public typealias NumericValue = Int32
    100 }
    101 
    102 extension Int64: Scalar, Verifiable {
    103   public typealias NumericValue = Int64
    104 }
    105 
    106 extension UInt8: Scalar, Verifiable {
    107   public typealias NumericValue = UInt8
    108 }
    109 
    110 extension UInt16: Scalar, Verifiable {
    111   public typealias NumericValue = UInt16
    112 }
    113 
    114 extension UInt32: Scalar, Verifiable {
    115   public typealias NumericValue = UInt32
    116 }
    117 
    118 extension UInt64: Scalar, Verifiable {
    119   public typealias NumericValue = UInt64
    120 }
    121 
    122 public func FlatBuffersVersion_23_5_26() {}