mirror of
https://github.com/google/flatbuffers.git
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5a95b7b6bc
* Offical Swift port for FlexBuffers This is the offical port for FlexBuffers within swift, and it introcudes a Common Module where code is shared between flatbuffers and flexbuffers. Writing most supported values like maps, vectors, nil and scalars into a flexbuffer buffer. And includes tests to verify that its similar to cpp * Reading a flexbuffer Implementing reading from a flexbuffer, enabling most of the buffers features, like most types, maps, vectors, typedvectors, and fixedtypedvectors. Currently, if an offset/object cant be read we default to a swift nil instead of the default flexbuffers 'null' with all values. * Fixes bazel breaking due to new project structure Address warnings within the library * Adds comment on why we added the code & properly enforce the amout of bytes needed
49 lines
1.2 KiB
Swift
49 lines
1.2 KiB
Swift
/*
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* Copyright 2024 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import Foundation
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extension Int {
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/// Moves the current int into the nearest power of two
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///
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/// This is used since the UnsafeMutableRawPointer will face issues when writing/reading
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/// if the buffer alignment exceeds that actual size of the buffer
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@inline(__always)
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public var convertToPowerofTwo: Int {
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guard self > 0 else { return 1 }
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var n = UInt32(self)
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#if arch(arm) || arch(i386)
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let max = UInt32(Int.max)
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#else
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let max = UInt32.max
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#endif
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n -= 1
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n |= n >> 1
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n |= n >> 2
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n |= n >> 4
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n |= n >> 8
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n |= n >> 16
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if n != max {
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n += 1
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}
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return Int(n)
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}
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}
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