110 lines
3.2 KiB
Swift
110 lines
3.2 KiB
Swift
/*
|
|
* Copyright 2024 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.
|
|
*/
|
|
|
|
import Foundation
|
|
|
|
extension String: Verifiable {
|
|
|
|
/// Verifies that the current value is which the bounds of the buffer, and if
|
|
/// the current `Value` is aligned properly
|
|
/// - Parameters:
|
|
/// - verifier: Verifier that hosts the buffer
|
|
/// - position: Current position within the buffer
|
|
/// - type: The type of the object to be verified
|
|
/// - Throws: Errors coming from `inBuffer`, `missingNullTerminator` and `outOfBounds`
|
|
public static func verify<T>(
|
|
_ verifier: inout Verifier,
|
|
at position: Int,
|
|
of type: T.Type) throws where T: Verifiable
|
|
{
|
|
|
|
let range = try String.verifyRange(&verifier, at: position, of: UInt8.self)
|
|
/// Safe &+ since we already check for overflow in verify range
|
|
let stringLen = range.start &+ range.count
|
|
|
|
if stringLen >= verifier.capacity {
|
|
throw FlatbuffersErrors.outOfBounds(
|
|
position: UInt(clamping: stringLen.magnitude),
|
|
end: verifier.capacity)
|
|
}
|
|
|
|
let isNullTerminated = verifier._buffer.read(
|
|
def: UInt8.self,
|
|
position: stringLen) == 0
|
|
|
|
if !verifier._options._ignoreMissingNullTerminators && !isNullTerminated {
|
|
let str = verifier._buffer.readString(at: range.start, count: range.count)
|
|
throw FlatbuffersErrors.missingNullTerminator(
|
|
position: position,
|
|
str: str)
|
|
}
|
|
}
|
|
}
|
|
|
|
extension String: FlatbuffersInitializable {
|
|
|
|
/// Initailizes a string from a Flatbuffers ByteBuffer
|
|
/// - Parameters:
|
|
/// - bb: ByteBuffer containing the readable string
|
|
/// - o: Current position
|
|
public init(_ bb: ByteBuffer, o: Int32) {
|
|
let v = Int(o)
|
|
let count = bb.read(def: Int32.self, position: v)
|
|
self = bb.readString(
|
|
at: MemoryLayout<Int32>.size + v,
|
|
count: Int(count)) ?? ""
|
|
}
|
|
}
|
|
|
|
extension String: ObjectAPIPacker {
|
|
|
|
public static func pack(
|
|
_ builder: inout FlatBufferBuilder,
|
|
obj: inout String?) -> Offset
|
|
{
|
|
guard var obj = obj else { return Offset() }
|
|
return pack(&builder, obj: &obj)
|
|
}
|
|
|
|
public static func pack(
|
|
_ builder: inout FlatBufferBuilder,
|
|
obj: inout String) -> Offset
|
|
{
|
|
builder.create(string: obj)
|
|
}
|
|
|
|
public mutating func unpack() -> String {
|
|
self
|
|
}
|
|
|
|
}
|
|
|
|
extension String: NativeObject {
|
|
|
|
public func serialize<T: ObjectAPIPacker>(type: T.Type) -> ByteBuffer
|
|
where T.T == Self
|
|
{
|
|
fatalError("serialize should never be called from string directly")
|
|
}
|
|
|
|
public func serialize<T: ObjectAPIPacker>(
|
|
builder: inout FlatBufferBuilder,
|
|
type: T.Type) -> ByteBuffer where T.T == Self
|
|
{
|
|
fatalError("serialize should never be called from string directly")
|
|
}
|
|
}
|