DotNetZip Library

New Post: Top-level folder not appearing as ZipEntry within zip file

ronks — Tue, 18 Jun 2013 00:28:11 GMT

I'm seeing some odd behavior when I try to read a zip file and enumerate the contents. I'm using Visual Basic 10 on Windows 7, and Ionic.Zip.Reduced.dll version 1.9.1.8.

Basically DNZ doesn't recognize folders in the top level of the zip file. It recognizes the files within them, and also the subfolders within them and the files within those subfolders.

Say I have file TopLevelZip.zip structured like this:

File1 at the top level
File2 at the top level
FolderA at the top level containing

File3
File4

FolderB at the top level containing

FolderB2 at the next level containing
  - File5

Running this VB code:

  Using zip1 As ZipFile = ZipFile.Read(ZipToUnpack)
    Dim e As ZipEntry
    For Each e In zip1
      Debug.Print(e.Info)
    Next
  End Using

will return info on all five files, and FolderB2; but not FolderA or FolderB.
I would like to return as a ZipEntry each of those two missing folders at the top level, as well as what presently appears.
Any ideas?

New Post: "Garbage" files in directory crashing DotNetLib

waltermetcalf — Thu, 13 Jun 2013 20:35:22 GMT

Hi,

I'm trying to use DotNetZip to zip directories for back-up. I'm using the following script, based heavily one I found in the PowerShell examples.

[System.Reflection.Assembly]::LoadFrom('c:\Users\Walter\Documents\WindowsPowerShell\Modules\WalterMetcalf\DotNetZip\Ionic.Zip.dll');



$directoryToZip = 'c:\Users\Walter\Documents\';

$zipfile =  new-object Ionic.Zip.ZipFile;

$e= $zipfile.AddEntry("Readme.txt", "This is a zipfile created from within powershell.");

$e= $zipfile.AddDirectory($directoryToZip, "home");

$zipfile.Save("D:\ZipFiles-ps1-out.zip");

$zipfile.Dispose();

` The script give a "Access denied" exception error on a file called TV_Music.ini, supposedly in a sub-directory which doesn't contain it--UNTiL you turn on "Display Hidden Files" in Windows Explorer! During my testing I have had the exception occur on other files, which apparently don't exist.
I'm guessing these files are re-parse items, but turning off (=FALSE) the "WillTraverseReparsePoints" property only make the problem worse.

Any ideas, suggestions?

Thanks,
Walter

P.S. I'm using update 1.9.1.8 of the library; PS 3.0 on Windows 7 SP1

Created Unassigned: System.ObjectDisposedException: Cannot access a closed file [16254]

ikllano — Tue, 11 Jun 2013 07:05:47 GMT

I have this code:

```
Using zip As ZipFile = New ZipFile()
zip.UseZip64WhenSaving = Zip64Option.AsNecessary
If (tamMaxFichero IsNot Nothing) Then
zip.MaxOutputSegmentSize = tamMaxFichero
End If

zip.UpdateDirectory(rutaDirectorio)
If (exclusiones IsNot Nothing) Then
Dim entradas As List(Of Ionic.Zip.ZipEntry)
For Each exclusion In exclusiones
entradas = zip.Entries.Where(Function(f) f.FileName.ToUpper().Contains(exclusion.ToUpper())).ToList()
For Each entrada In entradas
zip.RemoveEntry(entrada)
Next
Next
End If

zip.CompressionLevel = nivelCompresion
zip.Save(ficheroSalida)
End Using
```
Sometimes (not always) I get a System.ObjectDisposedException exception. Anyone can help me or tell me what is happening. Any solution to this?

Thanks in advance

Commented Issue: BZip2InputStream.Read returns -1 instead of 0 [16069]

meddingt — Mon, 10 Jun 2013 21:32:28 GMT

According to documentation on Stream class, the Read method should return 0 if the end of the stream has been reached, and there's no single mention of -1 possibility. But BZip2InputStream returns -1 if EOF is encountered.

This breaks some code relying on 0 as the EOF. I believe that Stream.CopyTo(...) will break as it checks for 0 as EOF.
Comments: ** Comment from web user: meddingt **

return (destOffset == offset) ? -1 : (destOffset - offset);

Commented Issue: BZip2InputStream.Read returns -1 instead of 0 [16069]

meddingt — Mon, 10 Jun 2013 21:31:24 GMT

This should have a higher impact than low. This has a large affect on any implementation assuming correct behavior, or supporting different base stream types.

Commented Issue: ZipFile.AddFile fails depending of the file size. [14087]

mlavoie88 — Fri, 07 Jun 2013 16:01:02 GMT

AddFile truncate the entry, and Extract trow an exception "bad read of entry test/MyFile.txt from compressed archive."

Debugging step by step sometimes work fine.

My code:

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim str As New String(" "c, 2490368)
IO.File.WriteAllText("C:\test\MyFile.txt", str)
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Using zip As New Ionic.Zip.ZipFile
zip.AddFile("C:\test\MyFile.txt")
zip.Save("C:\test\MyZip.zip")
End Using
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Using zip As Ionic.Zip.ZipFile = Ionic.Zip.ZipFile.Read("C:\test\MyZip.zip")
For Each arch As Ionic.Zip.ZipEntry In zip
arch.Extract("C:\test\opened")
Next
End Using
End Sub
Comments: ** Comment from web user: mlavoie88 **

I also just encountered this issue. Easy to work around with the ParallelDeflate setting, but difficult to isolate the failure since it occurs only on files of a specific size. I concur with earlier comments that the impact of this bug should be higher.

Commented Unassigned: Dont work with .VTF [16244]

phantom96 — Fri, 07 Jun 2013 11:26:00 GMT

Have out of range expection with .VTF(Valve Texture) files.
Comments: ** Comment from web user: phantom96 **

Sorry, with 1.9.18 binaries works fine.

Created Unassigned: Dont work with .VTF [16244]

phantom96 — Fri, 07 Jun 2013 11:16:12 GMT

Have out of range expection with .VTF(Valve Texture) files.

Commented Unassigned: Filename changed for unusual character [16242]

Nenotlep — Thu, 06 Jun 2013 10:05:35 GMT

The filename of an Added file changes to a different one within the zipfile, I found the case below but I'm guessing the issue is for other characters as well. Using Version 1.9.1.8, RuntimeVersion v2.0.50727.

Code to repeat:
```
ZipFile z = new ZipFile();
z.AddFile(@"C:\temp\–.pdf");
z.Save(@"c:\temp\out.zip");
```

This might be a dupe, but I am not sure for which issue.
Comments: ** Comment from web user: Nenotlep **

The character '–' changes to a regular hyphen '-'.

Created Unassigned: Filename changed for unusual character [16242]

Nenotlep — Thu, 06 Jun 2013 10:01:43 GMT

New Post: "Bad CRC32 in GZIP trailer" error if I don't read the whole stream

thezman — Tue, 04 Jun 2013 22:13:09 GMT

I found some time to dig into this.

Looking at the .Net version there is some CRC32 checking (see GZipDecoder.ReadFooter and Inflator.Decode if you have Reflector or equivalent). However that code only appear to be called as the stream is read and it gets to the end. However GZipStream doesn't override Close or Dispose so no checks are done when you do that.

The code in DotNetZip that says //read to end of file is not doing that at all. The checksum needs 8 bytes so if there's less than 8 bytes in the buffer it reads enough bytes of the next block so that it has 8 bytes.

My workaround for this is that I've pulled the DotNetZip source into my code and modified Close such that it takes a bool that allows me to disable the CRC check.

This is a tough one to 'fix'. Its clearly much safer to to the checksum but it would mean adding code to read the whole file apart from the last 8 bytes - I was unable to work out how to do this safely in my experiments. On a big file this could be expensive which makes it slower then the .Net version AND a different behavior in this scenario.

New Post: Classic ASP and .xlsx report

clef — Wed, 29 May 2013 17:23:05 GMT

Hi All, im new here and I just want to ask if someone has a good example of how to create an excel report using classic asp code and save it as .xlsx format. At this point i can generate .xls files but now I want to create the same report but in .xlsx format.

Is this possible using DotNetZip??

Thanks in advance.

Commented Issue: Problem space in file name to zip [14420]

ew8cn — Wed, 29 May 2013 04:16:25 GMT

Hi, I have wrote a program that use your library. If I zip a file whit space in file name and open it with 7-zip i receive this error: UNABLE TO OPEN FILE...
There is any option to set for this problem?
I use VB.NET

Thanks
Comments: ** Comment from web user: ew8cn **

I have the same problem, what should I do?

New Post: How many threads will be created by Ionic?

jyotiranjanr — Mon, 27 May 2013 14:52:54 GMT

Hello,
I wanted to use Ionic in my project and just wanted to know will it create any extra threads? If it is creating extra threads, how can I see/monitor those threads.I wanted to use this in a Windows Service VS2010 application.

Note: I want to use "Ionic.Utils.Zip.Dll"

Thanks.

New Post: "Bad CRC32 in GZIP trailer" error if I don't read the whole stream

thezman — Sun, 26 May 2013 14:36:42 GMT

Thanks.... I wish it was that easy but I'm trying to read not write and there's plenty of disc space.. Hopefully it will help others though.

New Post: "Bad CRC32 in GZIP trailer" error if I don't read the whole stream

mjfulke — Sun, 26 May 2013 03:14:28 GMT

I read you post having the same problem. After about an hour I realized the drive I was writing to was out of space. I cleared off a bunch of space and now I don't get the error. Not sure this is your situation but I'm guessing this was one of those errors where the real problem is not evident in the error message.

New Post: Failure to extract a file from an encrypted archive

aaitken — Fri, 24 May 2013 14:59:47 GMT

Hi, has there been any progress with this issue?

I am also experiencing this with a particular set of files. Other sets of files decompress fine.
There are 3937 files and 3405 of them get unzipped successfully and it fails on the same file each time. Even if the files are compressed again the same thing happens.

Commented Issue: Size of extracted file does not match the uncompressed size recorded in the zip file [16173]

johnbuuck — Thu, 16 May 2013 19:49:40 GMT

When the attached file, TestZipItBug.dat, is added to a zip file using ZipIt with all default options, the resulting entry in the zip file cannot be extracted with the Ionic.Zip.dll or with standard WinZip. WinZip reports the following:

Extracting to "C:\Temp\"
Use Path: yes Overlay Files: no
Extracting testzipitdeflatebug.dat
CRC check failed
Error: Unable to extract "C:\Temp\testzipitdeflatebug.dat".

The size of the extracted file (2686976) does not match the uncompressed size (3080192) recorded in the Zip file

NOTE: This also happens when using "-C none" option to avoid compression. However, if "-C bzip" is used, then the resulting zip entry extracts ok.
Comments: ** Comment from web user: johnbuuck **

I assume that Ionic.zip is intended to successfully zip/unzip any file (within size constraints). If so, then it seems this issue should have very high importance since it provides a known case where it fails (without being due to any unusual options or other environmental issues). I ran across another file that failed in the same way but it can't be attached here because the attachment limit here is 4MB and the file is 20MB.

Commented Issue: Degrade gracefully when filenames cannot be encoded in selected code page [10843]

airboy — Sat, 11 May 2013 11:23:25 GMT

If I zip this file and leave UseUnicodeAsNecessary as FALSE the following happens:

Windows Explorer: Can not open it.

WinRar/WinZip: Can open it, but has weird names, and the Sub Folders do not work at all which is a problem

------------------------------------------

I also did some testing in Gmail with similarly named files. Gmail allows you to download attachments as a zip and it automatically detects that the characters are valid for a zip file and asks you What country you would like to compress it for. Selecting English will take out all illegal characters and replace them with underscores. This is something that I wish the dot net zip library did for me.
Comments: ** Comment from web user: airboy **

sorry for the double post... but i want to add that there is no need of using
zip.UseUnicodeAsNecessary = false;
just not use this...
hope it helps...

Commented Issue: Degrade gracefully when filenames cannot be encoded in selected code page [10843]

airboy — Sat, 11 May 2013 11:22:27 GMT

use the following parameters before zipping

zip.AlternateEncodingUsage = ZipOption.
zip.AlternateEncoding = Encoding.GetEncoding(737);

that helped me with a lot of Greek Characters...
;)