DotNetZip BadReadException on .Extract

I've got a weird file that when zipped with DotNetZip creates an 'ununzipable' archive. When I try to unzip it with 7zip it fails with `CRC failed in 'AjaxControlToolkit.dll'. File is broken.` When I zip it with 7zip manually it unzips fine. Has anyone come across a scenario where DotNetZip fails to zip a simple binary file correctly? Or am I using DotNetZip incorrectly? https://dl.dropbox.com/u/65419748/AjaxControlToolkit.dll ``` using System.IO; using Ionic.Zip; namespace ConsoleApplication1 { public class Program { public static void Main(string[] args) { var source = new FileInfo(@"C:\ZipDemo\AjaxControlToolkit.dll"); var target = new FileInfo(Path.ChangeExtension(source.FullName, "zip")); var folder = new DirectoryInfo(Path.ChangeExtension(source.FullName, null)); if (target.Exists) target.Delete(); if (folder.Exists) folder.Delete(true); using (var zip = new ZipFile(target.FullName)) { zip.AddFile(source.FullName, string.Empty); zip.Save(); } using (var zip = new ZipFile(target.FullName)) zip.ExtractAll(folder.FullName); } } } ``` Throws: ``` Unhandled Exception: Ionic.Zip.BadReadException: bad read of entry AjaxControlToolkit.dll from compressed archive. at Ionic.Zip.ZipEntry._CheckRead(Int32 nbytes) at Ionic.Zip.ZipEntry.ExtractOne(Stream output) at Ionic.Zip.ZipEntry.InternalExtract(String baseDir, Stream outstream, String password) at Ionic.Zip.ZipFile._InternalExtractAll(String path, Boolean overrideExtractExistingProperty) at Ionic.Zip.ZipFile.ExtractAll(String path) at ConsoleApplication1.Program.Main(String[] args) in C:\ZipDemo\ConsoleApplication1\ConsoleApplication1\Program.cs:line 27 ``` Edit: If I add an extra byte it works just fine, but it's not an acceptable solution. Fails without the `+ 1`. ``` var bytes = new byte[source.Length + 1]; File.ReadAllBytes(source.FullName).CopyTo(bytes, 0); zip.AddEntry(source.Name, bytes); ``` Update: Gave up and switched to SharpZipLib as it doesn't blow up on simple extract, but sure would be nice to know what was wrong with DotNetZip, it has a nicer API. Update2: Something about the length of file makes it blow up, 1179647 and 1179649 bytes are zipped and unzipped correctly. ``` var source = new FileInfo(@"C:\ZipDemo\foo.txt"); using (var writer = source.CreateText()) writer.Write(new string('a', 1179648)); ```