(fix): #8408 fixes a bug where the capacity of the buffer isnt verified before trying to verify the ID (#8413)

swift/Sources/FlatBuffers/FlatbuffersErrors.swift

@@ -19,6 +19,8 @@ import Foundation
 /// Collection of thrown from the Flatbuffer verifier
 public enum FlatbuffersErrors: Error, Equatable {
 
+  /// Thrown when trying to verify a buffer that doesnt have the length of an ID
+  case bufferDoesntContainID
   /// Thrown when verifying a file id that doesnt match buffer id
   case bufferIdDidntMatchPassedId
   /// Prefixed size doesnt match the current (readable) buffer size

swift/Sources/FlatBuffers/Verifier.swift

@@ -201,8 +201,12 @@ public struct Verifier {
     _depth -= 1
   }
 
+  @inline(__always)
   mutating func verify(id: String) throws {
     let size = MemoryLayout<Int32>.size
+    guard _capacity >= (size * 2) else {
+      throw FlatbuffersErrors.bufferDoesntContainID
+    }
     let str = _buffer.readString(at: size, count: size)
     if id == str {
       return