PureZIP library : ZIP / UNZIP files

Thorsten1867 · Post by **Thorsten1867** » Mon Aug 07, 2006 11:36 am

If I add with PureZip a archives file (ZIP or JCalG1) to my ZIP-archives, it's every time corrupted (not valid archives) after extracting.

gnozal · Post by **gnozal** » Mon Aug 07, 2006 1:29 pm

Thorsten1867 wrote:If I add with PureZip a archives file (ZIP or JCalG1) to my ZIP-archives, it's every time corrupted (not valid archives) after extracting.

No problems here.
Do you use the latest purebasic beta libraries ?

Thorsten1867 · Post by **Thorsten1867** » Mon Aug 07, 2006 1:34 pm

gnozal wrote:Do you use the latest purebasic beta libraries ?

PureBasic v4.00 (Windows - x86) - Build Date: 05/09/2006 - 23:26:02
PureBasic_4_00_(xz7xhz).exe

gnozal · Post by **gnozal** » Mon Aug 07, 2006 1:48 pm

Thorsten1867 wrote:
gnozal wrote:Do you use the latest purebasic beta libraries ?
PureBasic v4.00 (Windows - x86) - Build Date: 05/09/2006 - 23:26:02
PureBasic_4_00_(xz7xhz).exe

I mean the libraries from http://www.purebasic.com/beta

Thorsten1867 · Post by **Thorsten1867** » Mon Aug 07, 2006 1:52 pm

No, I will download it.

Thorsten1867 · Post by **Thorsten1867** » Mon Aug 07, 2006 2:02 pm

Now it seems to work. THANKS!!!!!

If tried to solve the problem many hours and were full of despair.

gnozal · Post by **gnozal** » Mon Aug 07, 2006 2:07 pm

Thorsten1867 wrote:Now it seems to work. THANKS!!!!!

If tried to solve the problem many hours and were full of despair.

No problem.

http://www.purebasic.fr/english/viewtop ... &start=115

wilbert · Post by **wilbert** » Sat Aug 26, 2006 7:11 am

Is it possibly to use the ImagePluginPNG library to compress data in memory ?

I only need the PureZIP_PackMemory functionality from the PureZIP library but since this library doesn't work together with the ImagePluginPNG library and PNG encoding also requires zlib compression I was wondering this.

gnozal · Post by **gnozal** » Sat Aug 26, 2006 7:49 am

wilbert wrote:Is it possibly to use the ImagePluginPNG library to compress data in memory ?

I don't know.

wilbert wrote:I only need the PureZIP_PackMemory functionality from the PureZIP library but since this library doesn't work together with the ImagePluginPNG library and PNG encoding also requires zlib compression I was wondering this.

You cannot use PureZIP and ImagePluginPNG together in the same project.
They both use a static ZLIB library ; I don't know what to do to avoid the POLINK error. Maybe Fred knows ...
What you can do :
- use another image plugin
- use the ZLIB DLL (look at Num3's web site).

gnozal · Post by **gnozal** » Fri Sep 15, 2006 3:10 pm

Remainder

In order to use PureZIP for PB4 without errors, you need the latest beta libairies from http://www.purebasic.com/beta because of a purebasic bug in the file library (ReadData()/Eof() bug : http://www.purebasic.fr/english/viewtopic.php?t=22186)

References :
- http://www.purebasic.fr/english/viewtop ... c&start=44
- http://www.purebasic.fr/english/viewtop ... highlight=

Thanks.

gnozal · Post by **gnozal** » Fri Sep 22, 2006 4:27 pm

User request :

Update V1.60 (both libs)

Changes :
- added : new function PureZIP_SetCompressionAlgorithm()

PureZIP_SetCompressionAlgorithm()

Syntax

PureZIP_SetCompressionAlgorithm(Algorithm.l)

Description

Set current compression algorithm.

Algorithms
#Z_NO_COMPRESSION : no compression (store)
#Z_DEFLATED : deflate algorithm

GeoTrail · Post by **GeoTrail** » Fri Sep 22, 2006 6:49 pm

Great work gnozal, as usual

RichardL · Post by **RichardL** » Sat Sep 23, 2006 9:17 am

I need to create an entry in a ZIP archive that is the concatenation of two areas of memory plus a block of zeros.

When writing to a normal binary file the following code does the job:

Code: Select all

If CreateFile(1,SFile$)             ; Open the new file
  WriteData(*FileImage,*StartOfLOG) ; Always write the SPAD,TIF and TSDB areas
  WriteData(*A,*B-*A)               ; Write the specified range of data from the LOG
  For n.w=0 To 130                  ; Write a tailpiece to ensure correct decoding
    WriteLong(0)
  Next
  CloseFile(1)
  MessageRequester("D_Log","Saved <"+SFile$+">")
Else
  MessageRequester("D_Log","Could not save Log File")
EndIf

I have successfully used 'PureZIP_AddMemory()' to save a block of memory but am unsure how to acheive the same as the binary file example, as above.

It would be difficult to build a single image by copying/creating the three parts because one of them could be many hundreds of MBytes in size.

Any suggestions are most welcome.

gnozal · Post by **gnozal** » Sat Sep 23, 2006 1:30 pm

RichardL wrote:I need to create an entry in a ZIP archive that is the concatenation of two areas of memory plus a block of zeros.

My suggestion :

First you need to create a new memory block, that is the concatenation of the two areas of memory plus a block of zeros.
Second, use PureZIP_AddMemory() or PureZIP_Archive_CompressMem() to add the new block to your ZIP file.

If you can't create a new block in memory (not enough memory?), create a new temporary file that is the the concatenation of the two areas of memory plus a block of zeros, then add this temp file to the ZIP file with PureZIP_AddFile() or PureZIP_Archive_Compress(), and finaly delete the temp file.

RichardL · Post by **RichardL** » Sat Sep 23, 2006 4:44 pm

Hi Gnozal,

I have already taken the second route you suggested, using the binary file as the intermediate file. On consideration it was the only way to go.

The project involves reading telemetry data from memory cards... last year the cards were 64MByte and I could read them all into memory without problems. This year 512M cards, up to half full. Next year up to 100% full and the year after we move to 1GB or 2GB cards.

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PureZIP library : ZIP / UNZIP files

Joining memory blocks into one ZIP file

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