Adding to .zip archive removes file system access rules

从 src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs 开始，检查第 3132-3143 行附近的完成代码，以及第 4663-4713 行附近的临时和最终输出处理。使用提供的 AddEntryRevertingFilePermissions 测试重现该问题，然后添加回归覆盖，证明对存档设置的访问规则在 CommitUpdate() 后仍然保留。

When adding to a .zip archive on disk, the update does not happen in place. Instead, a temporary .zip file with the updated contents is created in a temporary directory first, which replaces the original archive after a successful write. As a result, any file system access rules set on the .zip archive that is updated are lost.

Steps to reproduce

1. Run the snippet below in a debugger

		[Test]
		[Category("Zip")]
		[Category("CreatesTempFile")]
		public void AddEntryRevertingFilePermissions()
		{
			const string TestValue = "0001000";
			string tempFile = "c:/temp/";
			Assert.IsNotNull(tempFile, "No permission to execute this test?");

			tempFile = Path.Combine(tempFile, "SharpZipTest.Zip");

			// create empty zip file
			using (ZipFile f = ZipFile.Create(tempFile))
			{
				f.BeginUpdate();
				f.CommitUpdate();
			}

			Console.WriteLine("break here and manually amend permissions for c:/temp/SharpZipTest.Zip by adding a rule");

			using (ZipFile f = new ZipFile(tempFile))
			{
				var m = new StringMemoryDataSource(TestValue);
				f.BeginUpdate();
				f.Add(m, "a.dat");
				f.CommitUpdate();
			}

			Console.WriteLine("permissions for c:/temp/SharpZipTest.Zip are reverted");
		}

2. Break in the middle and amend permissions to the file by adding an access rule.
3. Run to completion and verify that the file permission has reverted.

Expected behavior

File permissions should be retained

Actual behavior

File permissions inherited from temporary directory (e.g. C:\Users\username\AppData\Local\Temp\) are set

Version of SharpZipLib

Obtained from (only keep the relevant lines)

• Compiled from source, commit: https://github.com/icsharpcode/SharpZipLib/commit/cd5310f5b7eed595110b76a2f7ae5ee013cc50f1

Further detail

The update is finalised: (directUpdate is false)
https://github.com/icsharpcode/SharpZipLib/blob/cd5310f5b7eed595110b76a2f7ae5ee013cc50f1/src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs#L3132-L3143

The temporary output (pointing to a temporary directory ) is created at https://github.com/icsharpcode/SharpZipLib/blob/cd5310f5b7eed595110b76a2f7ae5ee013cc50f1/src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs#L4663-L4669

The final output is created at
https://github.com/icsharpcode/SharpZipLib/blob/cd5310f5b7eed595110b76a2f7ae5ee013cc50f1/src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs#L4676-L4713