PureZIP library : ZIP / UNZIP files

[gnozal]

You must have done something additional. I couldn't find a lib that worked with PB there. Besides, there are some references to purezip inside your lib...

It's the DLL from WinImage (link in my previous post) transformed to a static library. But I've also used the regular static lib from WinImage, and it works likewise (in PureZIP).

[fizban]

Oh. I didn't know that was possible. How did you transform the dll into a lib? I have googled it and only found a $999 tool and a free python script...

[gnozal]

Oh. I didn't know that was possible.

It is, but probably not for all DLLs. And there might be some big dependancy problems.

How did you transform the dll into a lib?

I didn't.
A friend of mine is a developer and has such tools (DLL2LIB I believe ?).

[fizban]

If it is dll2lib, looking at their license statement, "BSI grants you a non-exclusive royalty-free right to compile, reproduce and distribute the static libraries, DLLs, components, header files, source files (the "REDISTRIBUTABLES") or new software programs created using THE SOFTWARE".
So, my interpretation is that it safe to use this lib commercially, licensewise.

[fizban]

Just in case, I downloaded Visual C++ Express 2005 and the platform SDK 2008 and I rebuilt zlibstat.lib. It was easier than I expected. The worst thing was downloading all those megs just to compile this small library. The resulting lib is larger than yours, though, but a little bit smaller than the one at winimage. Using this new zlibstat I get a smaller executable than with yours. It might be related to the dll to lib conversion... I can send it to you if you want so that you can make it available to others...

[gnozal]

I can send it to you if you want so that you can make it available to others...

That would be nice, thanks.
[EDIT] Got it, thanks. See my PM.

[graves]

Hi, gnozal,
I'm using PureZip_AddFiles command with #PureZIP_Recursive flag activated.

On "FileMask" parameter I need to specify some mask to not add "*.pst" files (they are very big). Is possible that mask?.

Yes. I can make ExamineDirectory() and then PureZIP_AddFile for every entry (except pst files), I know that, but #PureZIP_Recursive is very useful.

[gnozal]

On "FileMask" parameter I need to specify some mask to not add "*.pst" files (they are very big). Is possible that mask?.

Sorry, you can't do that. PureZip_AddFiles() is only a convenient wrapper to the PureZIP_Archive_*() functions.
My advise is to scan the directory using ExamineDirectory() and archive the files you need using the PureZIP_Archive_*() functions.

Something like this (not tested, but you get the idea) :

Code: Select all

Global NewList FileList.s()
Procedure DirectoryListing(Recursive.l, Directory.s)
  Protected MyDir.l, FullFileName.s, FileName.s
  MyDir = ExamineDirectory(#PB_Any, Directory, "*.*")
  If MyDir
    Repeat
      If NextDirectoryEntry(MyDir) = 0
        Break
      EndIf
      FileName = DirectoryEntryName(MyDir)
      If Right(Directory, 1) <> ""
        Directory = Directory + ""
      EndIf
      FullFileName = Directory + FileName
      If DirectoryEntryType(MyDir) = #PB_DirectoryEntry_Directory And Recursive 
        If FileName <> "." And FileName <> ".."
          DirectoryListing(Recursive, Directory + FileName)
        EndIf
      ElseIf DirectoryEntryType(MyDir) = #PB_DirectoryEntry_File
        If LCase(GetExtensionPart(FileName)) <> "pst"
          AddElement(FileList())
          FileList() = FullFileName
        EndIf
      EndIf
    ForEver
    FinishDirectory(MyDir)
  EndIf
EndProcedure
DirectoryListing(#True, "c:\MyTestDir")
If CountList(FileList())
  If PureZIP_Archive_Create("MyZIP", #APPEND_STATUS_CREATE)
    ForEach FileList()
      PureZIP_Archive_Compress(FileList(), #True)
    Next
    PureZIP_Archive_Close()
  EndIf
EndIf

[Kukulkan]

Hi Gnozal,

Is it possible to decompress data, compressed using PureZIP library, directly bu using ZLIB functions? Or is there a special header added to PureZIP compressed data? How to manage?

Kukulkan

[gnozal]

Hi

Is it possible to decompress data, compressed using PureZIP library, directly by using ZLIB functions?

Yes

Or is there a special header added to PureZIP compressed data?

No.

[Kukulkan]

Hi,

I have a file that was packed using PureZIP. I can decompress it with WinZIP or RAR and it works great.

If I try to use ZLIB to decompress, it tells me that the data was corrupt! The header starts with PK, but is this for ZLIB compression?

Kukulkan

[gnozal]

If I try to use ZLIB to decompress, it tells me that the data was corrupt!

What ZLIB functions do you use ?
Note that you have to use ZIP compatible functions like unzOpen() - unzGoToFirstFile() etc ...

The header starts with PK, but is this for ZLIB compression?

The 'PK' header is the classic PKZIP header. It has nothing to do with ZLIB.
I meant PureZIP doesn't add any extra header.

[Kukulkan]

Hi Gnozal,

My current problem is, that I decrypt some previous zip compressed file into memory. Now I need to unzip the data in memory, but PureZIP does not offer a function to unzip a ZIP file that is located in memory. Currently I solve this by storing the content temporarely on disk to use PureZIP_ExtractFile() function. But this is not a good solution. I need some PureZIP_ExtractFileFromMemory() function. By the way, a corresponding PureZIP_AddFileToMemory() function will be great, too.

To clearify: The memory content is a ZIP file in memory (PK...). The PureZIP_PackMemory() and PureZIP_UnpackMemory() functions do not work with ZIP-file in memory (it is DEFLATE compressed?).

My Idea has been to use another ZLIB library, but this one is not able to use a ZIP-file in memory, too

Kukulkan

[gnozal]

To clearify: The memory content is a ZIP file in memory (PK...). The PureZIP_PackMemory() and PureZIP_UnpackMemory() functions do not work with ZIP-file in memory (it is DEFLATE compressed?).

AFAIK, the ZLIB ZIP compatible functions only allow to open an archive from disk, not from memory : I don't know a function like unzOpen() for a memory bank.
It is certainly possible using some ZLIB base functions like deflate(), but you'll have to manage all the header stuff manually. I never tried that, sorry.

[Inner]

4.30 beta 2 & 3 of Purebasic reports;

The following PureLibrary is missing: StringExtension