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Add extension to convert objects of type Data to instances of NSMutableData

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This process is necessary because of an issue (https://github.com/golang/go/issues/33745) in gomobile. Passing bare Data objects to Go functions leads to nondeterministic behavior.
This commit is contained in:
Danny Moesch 2019-09-08 12:47:10 +02:00 • committed by Mingshen Sun
parent bfeb39f510
commit 4c3aa4938d
2 changed files with 23 additions and 0 deletions
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4
pass.xcodeproj/project.pbxproj
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@ -61,6 +61,7 @@
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@ -276,6 +277,7 @@
30C25DC621F3BEF500BB27BB /* de */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = de; path = de.lproj/InfoPlist.strings; sourceTree = "<group>"; }; 30C25DC621F3BEF500BB27BB /* de */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = de; path = de.lproj/InfoPlist.strings; sourceTree = "<group>"; };
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30CCA90A2325119C0048CA51 /* Data+Mutable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Data+Mutable.swift"; sourceTree = "<group>"; };
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@ -464,6 +466,7 @@
30B6AABA21F49095006B352D /* Extensions */ = { 30B6AABA21F49095006B352D /* Extensions */ = {
isa = PBXGroup; isa = PBXGroup;
children = ( children = (
30CCA90A2325119C0048CA51 /* Data+Mutable.swift */,
30697C3621F63C990064FCAC /* String+Localization.swift */, 30697C3621F63C990064FCAC /* String+Localization.swift */,
30697C3921F63C990064FCAC /* String+Utilities.swift */, 30697C3921F63C990064FCAC /* String+Utilities.swift */,
30697C3721F63C990064FCAC /* UITextFieldExtension.swift */, 30697C3721F63C990064FCAC /* UITextFieldExtension.swift */,
@ -1275,6 +1278,7 @@
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3032327422C7F710009EBD9C /* KeyFileManager.swift in Sources */, 3032327422C7F710009EBD9C /* KeyFileManager.swift in Sources */,
30CCA90B2325119C0048CA51 /* Data+Mutable.swift in Sources */,
A2AA934422DE30DD00D79A00 /* PGPAgent.swift in Sources */, A2AA934422DE30DD00D79A00 /* PGPAgent.swift in Sources */,
30697C3B21F63C990064FCAC /* String+Localization.swift in Sources */, 30697C3B21F63C990064FCAC /* String+Localization.swift in Sources */,
302E85612125ECC70031BA64 /* Parser.swift in Sources */, 302E85612125ECC70031BA64 /* Parser.swift in Sources */,

19
passKit/Extensions/Data+Mutable.swift Normal file
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@ -0,0 +1,19 @@
//
// Data+Mutable.swift
// passKit
//
// Created by Danny Moesch on 08.09.19.
// Copyright © 2019 Bob Sun. All rights reserved.
//
extension Data {
/// This computed value is only needed because of [this](https://github.com/golang/go/issues/33745) issue in the
/// golang/go repository. It is a workaround until the problem is solved upstream.
///
/// The data object is converted into an array of bytes and than returned wrapped in an `NSMutableData` object. In
/// thas way Gomobile takes it as it is without copying. The Swift side remains responsible for garbage collection.
var mutable: NSMutableData {
var array = [UInt8](self)
return NSMutableData(bytes: &array, length: count)
}
}