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/*
* Copyright 2021 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.
*/
#if !os(WASI)
import Foundation
#else
import SwiftOverlayShims
#endif
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")
}
}
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