ZipStorer.cs - Security and Compatibility Issues and Fixes

[EJocys]

Security Issue

Problem: Insecure temporary file creation methods should not be used.

var tempZipName = Path.GetTempFileName();
var tempEntryName = Path.GetTempFileName();

Solution:

var tempFolderPath = Path.GetTempPath();
var tempZipName = Path.Combine(tempFolderPath, Path.GetRandomFileName());
var tempEntryName = Path.Combine(tempFolderPath, Path.GetRandomFileName());

.NET 4.8 Compatibility issue

Problem: CodePagesEncodingProvider is not available in .NET 4.8

	CodePagesEncodingProvider.Instance.GetEncoding(437);
	Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
	DefaultEncoding = Encoding.GetEncoding(437);

Solution: Use condition to exclude code for .NET 48 build:

#if NET5_0_OR_GREATER
	CodePagesEncodingProvider.Instance.GetEncoding(437);
	Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
#endif
	DefaultEncoding = Encoding.GetEncoding(437);

[jaime-olivares]

Please see my comment in #52 regarding CP 437
I will incorporate your suggestion about temporary files once the previous is resolved.