Hello,
\r\nI am just wondering why when I create a zip file with the same set of source files and the checksum for the result zip file change each time. Nothing has changed inside the set of source.
\r\nHere are the step I use to create the zip in VB.nET
\r\n\r\n
Dim pzip as ZipFile
\r\npzip.AddDirectory(sourcefolder, zipdirectory)
\r\npzip.save(targetfile)
\r\n\r\n
Once the process completed, I ran the MD5 checksum or even CRC32 process and both of these checksum generator generate different checksum each time new zip file create. I tried version 1.8 and beta 1.9 and still get the same result.
\r\n\r\n
Thank you.
\r\n\r\n
Hugh
", "PostedDate": "2009-11-12T13:56:32.42-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "256548", "ThreadId": "74947", "Html": "Hi hugh,
\r\nI agree - the checksum should be the same. I just tried it here, and i get the same hash for the generated zip.
\r\nThat code doesn't run. What's the real code?
\r\nIf a timestamp changes on the file, the hash inside the zip will change.
\r\n\r\n
\r\n
", "PostedDate": "2009-11-12T19:32:28.75-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "256744", "ThreadId": "74947", "Html": "
Hi Cheeso,
\r\nThank you for taking a look at it. Below are the code that I used to zip, generate the checksum. Also included is the CRC32 and Checksum function. I normally use MD5 checksum.
\r\n Public Function GetFileChecksum(ByVal tfile As String, Optional ByVal tmode As String = "MD5") As String\r\n Try\r\n If File.Exists(tfile) Then\r\n Dim fStream As Stream = File.OpenRead(tfile)\r\n Dim checksum() As Byte = {0}\r\n\r\n Select Case tmode.ToLower\r\n Case "sha1"\r\n Dim mysha1 As SHA1 = New SHA1Managed()\r\n checksum = mysha1.ComputeHash(fStream)\r\n Case "sha256"\r\n Dim mysha256 As SHA256 = New SHA256Managed()\r\n checksum = mysha256.ComputeHash(fStream)\r\n Case "sha384"\r\n Dim mysha384 As SHA384 = New SHA384Managed()\r\n checksum = mysha384.ComputeHash(fStream)\r\n Case "sha512"\r\n Dim mysha512 As SHA512 = New SHA512Managed()\r\n checksum = mysha512.ComputeHash(fStream)\r\n Case Else\r\n Dim mymd5 As MD5 = MD5.Create()\r\n checksum = mymd5.ComputeHash(fStream)\r\n End Select\r\n\r\n fStream.Close()\r\n\r\n Dim buff As StringBuilder = New StringBuilder\r\n Dim hashByte As Byte\r\n For Each hashByte In checksum\r\n buff.Append(String.Format("{0:X2}", hashByte))\r\n Next\r\n\r\n 'Return Replace(BitConverter.ToString(checksum), "-", "")\r\n Return buff.ToString\r\n End If\r\n\r\n Catch ex As Exception\r\n\r\n End Try\r\n Return 0\r\n End Function\r\n\r\n Public Function GetCRC32(ByVal sFileName As String) As String\r\n Try\r\n Dim FS As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read, 8192)\r\n Dim CRC32Result As Integer = &HFFFFFFFF\r\n Dim Buffer(4096) As Byte\r\n Dim ReadSize As Integer = 4096\r\n Dim Count As Integer = FS.Read(Buffer, 0, ReadSize)\r\n Dim CRC32Table(256) As Integer\r\n Dim DWPolynomial As Integer = &HEDB88320\r\n Dim DWCRC As Integer\r\n Dim i As Integer, j As Integer, n As Integer\r\n\r\n 'Create CRC32 Table\r\n For i = 0 To 255\r\n DWCRC = i\r\n For j = 8 To 1 Step -1\r\n If (DWCRC And 1) Then\r\n DWCRC = ((DWCRC And &HFFFFFFFE) \\ 2&) And &H7FFFFFFF\r\n DWCRC = DWCRC Xor DWPolynomial\r\n Else\r\n DWCRC = ((DWCRC And &HFFFFFFFE) \\ 2&) And &H7FFFFFFF\r\n End If\r\n Next j\r\n CRC32Table(i) = DWCRC\r\n Next i\r\n\r\n 'Calcualting CRC32 Hash\r\n Do While (Count > 0)\r\n For i = 0 To Count - 1\r\n n = (CRC32Result And &HFF) Xor Buffer(i)\r\n CRC32Result = ((CRC32Result And &HFFFFFF00) \\ &H100) And &HFFFFFF\r\n CRC32Result = CRC32Result Xor CRC32Table(n)\r\n Next i\r\n Count = FS.Read(Buffer, 0, ReadSize)\r\n Loop\r\n\r\n FS.Close()\r\n Return Hex(Not (CRC32Result))\r\n Catch ex As Exception\r\n MsgBox("CRC32 calculate error: " & ex.StackTrace)\r\n End Try\r\n Return ""\r\n End Function\r\n\r\n Public Function getDirectoryName(ByVal tpath As String) As String\r\n Dim tdir As String = ""\r\n Try\r\n Dim tinfo As New DirectoryInfo(tpath)\r\n tdir = tinfo.Name\r\n Catch ex As Exception\r\n\r\n End Try\r\n\r\n Return tdir\r\n End Function\r\n\r\n Public Function ZipFolder(ByRef pzip As ZipFile, ByVal targetzip As String, ByVal sourcefolder As String _\r\n , Optional ByVal trecursive As Boolean = True _\r\n , Optional ByVal tfilter As String = "", Optional ByRef tbar As ToolStripProgressBar = Nothing) As Boolean\r\n Try\r\n ' Delete existing zip file\r\n If File.Exists(targetzip) Then\r\n File.Delete(targetzip)\r\n End If\r\n\r\n 'pzip = New ZipFile(targetzip)\r\n 'Dim zipentry As ZipEntry\r\n\r\n\r\n 'zipentry = pzip.AddDirectory(sourcefolder, getDirectoryName(sourcefolder))\r\n 'pzip.AddSelectedFiles("name != *~* And name != *$* And name != *.bak And name != *.BAK", sourcefolder, getDirectoryName(sourcefolder), True)\r\n pzip.AddSelectedFiles(tfilter, sourcefolder, getDirectoryName(sourcefolder), True)\r\n\r\n If Not tbar Is Nothing Then\r\n tbar.Minimum = 0\r\n tbar.Value = 0\r\n End If\r\n\r\n 'pzip.Save()\r\n\r\n pzip.Save(targetzip)\r\n\r\n If File.Exists(targetzip) Then\r\n Return True\r\n Else\r\n Return False\r\n End If\r\n Catch ex As Exception\r\n MsgBox("Message" & ex.Message & vbCr & "Stack Trace:" & vbCr & ex.StackTrace, MsgBoxStyle.Critical, "Zip Process Error")\r\n End Try\r\n\r\n Return False\r\n End Function\r\n\r\n",
"PostedDate": "2009-11-13T06:22:32.31-08:00",
"UserRole": null,
"MarkedAsAnswerDate": null
},
{
"Id": "256783",
"ThreadId": "74947",
"Html": "Hello Hugh,
\r\nThanks for the code - Just ran it, totally unchanged, and got the same results I saw earlier: the Md5 checksum for the generated zip file is always the same, for a set of files that has not changed.
\r\nIf I "touch" a file in the folder (update its timestamp), then the checksum of the resulting zip file is different, as expected.
\r\nHere's my code, in its entirety:
\r\n' HughChksum.vb\r\n'\r\n' Fri, 13 Nov 2009 10:26\r\n'\r\n' compile with\r\n'\r\n' c:\\.net3.5\\vbc.exe /t:exe /debug:full /R:Ionic.Zip.dll /out:HughChksum.exe HughChksum.vb\r\n'\r\n' ------------------------------------------------------------------\r\n\r\n\r\n\r\nImports System\r\nImports System.IO\r\nImports System.Text\r\nImports System.Windows.Forms\r\nImports System.Security.Cryptography\r\nImports Ionic.Zip\r\n\r\nNamespace Ionic.Tests.Zip\r\n\r\nPublic Class HughChksum\r\n\r\n ' Methods\r\n Public Function GetFileChecksum(ByVal tfile As String, Optional ByVal tmode As String = "MD5") As String\r\n Try\r\n If File.Exists(tfile) Then\r\n Dim fStream As Stream = File.OpenRead(tfile)\r\n Dim checksum() As Byte = {0}\r\n\r\n Select Case tmode.ToLower\r\n Case "sha1"\r\n Dim mysha1 As SHA1 = New SHA1Managed()\r\n checksum = mysha1.ComputeHash(fStream)\r\n Case "sha256"\r\n Dim mysha256 As SHA256 = New SHA256Managed()\r\n checksum = mysha256.ComputeHash(fStream)\r\n Case "sha384"\r\n Dim mysha384 As SHA384 = New SHA384Managed()\r\n checksum = mysha384.ComputeHash(fStream)\r\n Case "sha512"\r\n Dim mysha512 As SHA512 = New SHA512Managed()\r\n checksum = mysha512.ComputeHash(fStream)\r\n Case Else\r\n Dim mymd5 As MD5 = MD5.Create()\r\n checksum = mymd5.ComputeHash(fStream)\r\n End Select\r\n\r\n fStream.Close()\r\n\r\n Dim buff As StringBuilder = New StringBuilder\r\n Dim hashByte As Byte\r\n For Each hashByte In checksum\r\n buff.Append(String.Format("{0:X2}", hashByte))\r\n Next\r\n\r\n 'Return Replace(BitConverter.ToString(checksum), "-", "")\r\n Return buff.ToString\r\n End If\r\n\r\n Catch ex As Exception\r\n\r\n End Try\r\n Return 0\r\n End Function\r\n\r\n Public Function GetCRC32(ByVal sFileName As String) As String\r\n Try\r\n Dim FS As FileStream = New FileStream(sFileName, FileMode.Open, FileAccess.Read, FileShare.Read, 8192)\r\n Dim CRC32Result As Integer = &HFFFFFFFF\r\n Dim Buffer(4096) As Byte\r\n Dim ReadSize As Integer = 4096\r\n Dim Count As Integer = FS.Read(Buffer, 0, ReadSize)\r\n Dim CRC32Table(256) As Integer\r\n Dim DWPolynomial As Integer = &HEDB88320\r\n Dim DWCRC As Integer\r\n Dim i As Integer, j As Integer, n As Integer\r\n\r\n 'Create CRC32 Table\r\n For i = 0 To 255\r\n DWCRC = i\r\n For j = 8 To 1 Step -1\r\n If (DWCRC And 1) Then\r\n DWCRC = ((DWCRC And &HFFFFFFFE) \\ 2&) And &H7FFFFFFF\r\n DWCRC = DWCRC Xor DWPolynomial\r\n Else\r\n DWCRC = ((DWCRC And &HFFFFFFFE) \\ 2&) And &H7FFFFFFF\r\n End If\r\n Next j\r\n CRC32Table(i) = DWCRC\r\n Next i\r\n\r\n 'Calcualting CRC32 Hash\r\n Do While (Count > 0)\r\n For i = 0 To Count - 1\r\n n = (CRC32Result And &HFF) Xor Buffer(i)\r\n CRC32Result = ((CRC32Result And &HFFFFFF00) \\ &H100) And &HFFFFFF\r\n CRC32Result = CRC32Result Xor CRC32Table(n)\r\n Next i\r\n Count = FS.Read(Buffer, 0, ReadSize)\r\n Loop\r\n\r\n FS.Close()\r\n Return Hex(Not (CRC32Result))\r\n Catch ex As Exception\r\n MsgBox("CRC32 calculate error: " & ex.StackTrace)\r\n End Try\r\n Return ""\r\n End Function\r\n\r\n\r\n \r\n Public Function getDirectoryName(ByVal tpath As String) As String\r\n Dim tdir As String = ""\r\n Try\r\n Dim tinfo As New DirectoryInfo(tpath)\r\n tdir = tinfo.Name\r\n Catch ex As Exception\r\n\r\n End Try\r\n\r\n Return tdir\r\n End Function\r\n\r\n\r\n \r\n Public Function ZipFolder(ByRef pzip As ZipFile, ByVal targetzip As String, ByVal sourcefolder As String _\r\n , Optional ByVal trecursive As Boolean = True _\r\n , Optional ByVal tfilter As String = "*.*", Optional ByRef tbar As ToolStripProgressBar = Nothing) As Boolean\r\n Try\r\n ' Delete existing zip file\r\n If File.Exists(targetzip) Then\r\n File.Delete(targetzip)\r\n End If\r\n\r\n 'pzip = New ZipFile(targetzip)\r\n 'Dim zipentry As ZipEntry\r\n\r\n 'zipentry = pzip.AddDirectory(sourcefolder, getDirectoryName(sourcefolder))\r\n 'pzip.AddSelectedFiles("name != *~* And name != *$* And name != *.bak And name != *.BAK", sourcefolder, getDirectoryName(sourcefolder), True)\r\n pzip.AddSelectedFiles(tfilter, sourcefolder, getDirectoryName(sourcefolder), True)\r\n\r\n If Not tbar Is Nothing Then\r\n tbar.Minimum = 0\r\n tbar.Value = 0\r\n End If\r\n\r\n 'pzip.Save()\r\n\r\n pzip.Save(targetzip)\r\n\r\n If File.Exists(targetzip) Then\r\n Return True\r\n Else\r\n Return False\r\n End If\r\n Catch ex As Exception\r\n MsgBox("Message" & ex.Message & vbCr & "Stack Trace:" & vbCr & ex.StackTrace, MsgBoxStyle.Critical, "Zip Process Error")\r\n End Try\r\n\r\n Return False\r\n End Function\r\n\r\n\r\n Public Sub Run()\r\n Dim name As String = "HughChksum.zip"\r\n \r\n Using zip As ZipFile = New ZipFile\r\n zip.StatusMessageTextWriter = System.Console.Out\r\n ZipFolder(zip, name, folderToZip)\r\n End Using \r\n\r\n System.Console.WriteLine("{0}", GetFileChecksum(Name))\r\n \r\n End Sub\r\n\r\n \r\n Public Shared Sub Main(ByVal args As String())\r\n Try \r\n Dim X as New HughChksum(args)\r\n X.Run\r\n Catch exc1 As Exception\r\n Console.WriteLine("Exception: {0}", exc1.ToString)\r\n End Try\r\n End Sub\r\n\r\n\r\n Public Sub New(ByVal args As String())\r\n If args.Length <> 1 Then\r\n Usage\r\n End If\r\n \r\n If args(0)="-?" Then\r\n Usage\r\n End If\r\n\r\n folderToZip = args(0)\r\n End Sub\r\n\r\n Private folderToZip As String\r\n\r\n Private Shared Sub Usage()\r\n Console.WriteLine( _\r\n "HughChksum: zips a folder and computes an MD5 checksum on the resulting zip. " & vbcrlf & _\r\n "usage:" & ChrW(10) & " HughChksum <folderToZip>" & vbcrlf _\r\n )\r\n Environment.Exit(1)\r\n End Sub\r\n\r\nEnd Class\r\n\r\n\r\nEnd Namespace\r\n\r\n\r\n
", "PostedDate": "2009-11-13T07:34:45.073-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "256850", "ThreadId": "74947", "Html": "
Thank you very much for your help. This is just weird, I ran your test case on my set and the checksum are different each time. I don't see anything I can attach the file of my zip source but basically, I have 10 identical files 5 in the root folder and the other in the sub folder as shown.
\r\n\r\n
\r\n
\r\n
C:\\DOTNET\\ZipConsole\\ZipConsole\\bin\\Release>ConsoleApplication1 C:\\ICT\\Programs\\
\r\nZiptest
\r\nadding selection '*.*' from dir 'C:\\ICT\\Programs\\Ziptest'...
\r\nfound 10 files...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8001.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8002.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8003.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8004.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8005.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800A.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800B.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800C.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800D.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800F.INI...
\r\nsaving....
\r\n1FAA0D1B7B83A3D77EA0A75ECD1EC137
\r\n\r\n
C:\\DOTNET\\ZipConsole\\ZipConsole\\bin\\Release>ConsoleApplication1 C:\\ICT\\Programs\\
\r\nZiptest
\r\nadding selection '*.*' from dir 'C:\\ICT\\Programs\\Ziptest'...
\r\nfound 10 files...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8001.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8002.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8003.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8004.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8005.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800A.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800B.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800C.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800D.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800F.INI...
\r\nsaving....
\r\n8002C651428848F629D5C4CA491A5EA8
\r\n\r\n
C:\\DOTNET\\ZipConsole\\ZipConsole\\bin\\Release>ConsoleApplication1 C:\\ICT\\Programs\\
\r\nZiptest
\r\nadding selection '*.*' from dir 'C:\\ICT\\Programs\\Ziptest'...
\r\nfound 10 files...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8001.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8002.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8003.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8004.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8005.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800A.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800B.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800C.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800D.INI...
\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800F.INI...
\r\nsaving....
\r\nDB2939073424B932AB2AF6B57B180304
\r\n\r\n", "PostedDate": "2009-11-13T10:02:01.767-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "256880", "ThreadId": "74947", "Html": "
| \r\n very weird. But I have an idea. \r\nok try this: \r\nmodify the code so the Run sub looks like this: \r\n\r\n \r\nPublic Sub Run()\r\n Dim name As String = "HughChksum.zip"\r\n \r\n Using zip As ZipFile = New ZipFile\r\n zip.EmitTimesInWindowsFormatWhenSaving = False '' <-- insert this\r\n zip.StatusMessageTextWriter = System.Console.Out\r\n ZipFolder(zip, name, folderToZip)\r\n End Using \r\n\r\n System.Console.WriteLine("{0}", GetFileChecksum(Name))\r\n \r\n End Sub\r\n\r\n By default, the library stores 3 timestamps for each file into the zip: the created, modified, and "last accessed" time. And yes, in NTFS, the "last accessed" time gets updated when you read the file. \r\nAs I was trying to figure out what could be changing, it occurred to me - I think I may have disabled lastaccess tracking on my NTFS volume, as a performance optimization. Which means, the "last accessed" time is updated lazily, and in my case it might not be updated at all. In your case, "last access" tracking could still be enabled on your NTFS volume, which means it will be updated, every time you read each ini file. \r\nBy inserting that extra line into the code, you're telling the library not to include any of the timestamps into the zip. If this produces zips with the same checksum, then you know it's the timestamp. \r\nWe can talk about whether you want to use EmitTimesInWindowsFormatWhenSaving in your production, after you run the test. \r\n\r\n | \r\n
| \r\n Upon further review, in Windows Vista, NTFS "last access" tracking is disabled by default. \r\n\r\nIn Windows XP and other operating systems, I believe it is enabled by default. Regardless of the OS you're using, you may have it enabled, in which case the content of the zip would change. \r\nI have it disabled - I use Vista, so it's disabled by default - and as a result the timestamps don't change, and the checksums don't change. \r\n\r\n | \r\n
After inserted the line at the code the problem fixed. I get the same checksum for both run now.
\r\n", "PostedDate": "2009-11-13T11:20:23.537-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "256903", "ThreadId": "74947", "Html": "adding C:\\ICT\\Programs\\Ziptest\\TR8004.INI...\r\nadding C:\\ICT\\Programs\\Ziptest\\TR8005.INI..adding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800A.INI...\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800B.INI...\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800C.INI...\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800D.INI...\r\nadding C:\\ICT\\Programs\\Ziptest\\Folder1\\TR800F.INI...\r\nsaving....\r\n2C8F5ACBE62764EC8B50F8D2DF12409F
| \r\n ok, so that clears up the mystery. Now, you have to decide whether you want the timestamps in there or not. \r\nSome people use a checksum on a zip to find out if it's been changed, before transmitting it for example. If that's your scenario they you're gonna want the zip to be the same, all the way down to the timestamp. \r\nOn the other hand some people like the extended timestamps in the zip file. Without those, when you unzip, the unzipped files will not have the same time/date metadata. \r\nIf you want both - you want the timestamps in there, but you also want the checksum to be consistent - then you can manually set the AccessedTime property on each Entry as it is added to the zip, prior to saving it. You can set it to a fixed time, or set it to the latest "last modified" time of any entry. Either way it will result in a zip file that has the same checksum, each time. \r\n\r\n | \r\n
Hi Cheeso,
\r\nThe first scenario is what I want. I am using the checksum to compare with what I already had on the server to see if I need to make the upload or not. Since the directory that I want has a bunch of files and I don't want to index each one by itself. What I do is zipped the whole directory and compare the checksum of the server version with the current version. If they are not the same then I will transmit if they are the same then abort. So, I really do not want the last access time. I just want to get the Create/Modified time.
\r\nSo after reading the documentation on the zip doc, I think I will set this flag to false. I really do not care about the time on the zip file itself, just the content of the zip only.
\r\n\r\n
Thank you very very much for all of your help. This is such a great work. Keep up the great job you are doing.
", "PostedDate": "2009-11-13T12:01:55.69-08:00", "UserRole": null, "MarkedAsAnswerDate": null }, { "Id": "256917", "ThreadId": "74947", "Html": "| \r\n Thanks for the compliments. \r\n> I really do not want the last access time. I just want to get the Create/Modified time. \r\n> I really do not care about the time on the zip file itself,... \r\nto clarify, the timestamps I mentioned previously are on the entries within the zip, not on the zip file itself. \r\nAND, If you want the create+modified times - those are 2 different timestamps - then you need the extended tiemstamp. To do this you must set EmitTimesInWindowsFormatWhenSaving = True, or don't set it at all (True is the default). In this case, you will need to set the AccessedTime on each entry in order to keep the checksum of the generated zip file, constant across multiple runs. \r\nIf you are happy with only the modified time on each entry inside the zip, then you can set EmitTimesInWindowsFormatWhenSaving to False. \r\n\r\n \r\n | \r\n