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Parallel archiver version 1.06 , stable version...

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Hello

Parallel archiver version 1.06 , stable version is here,
i have stress tested it and you can be now more confident with it...


Author: Amine Moulay Ramdane

Description: Parallel archiver using my ParallelZlib..

Supported features:

- Opens and creates archives using my ParrallelZlib

- Compiles into exe - no dll/ocx required.

- 64 bit supports - lets you create archive files over 4 GB

- Now my ParallelZlb gives 5% better performance than Pigz.

- Parallel compression and parallel decompression are extremely fast

- It supports both compression and decompression rate indicator

- You can test your archive

- Easy object programming interface

- Full source codes available.

- Platform: Win32 ,Win64 (will be ported soon to Linux and Mac OS

Will support parallel encryption and LZMA and LZ and Bzip and memory 
streams in the near future

Please look at test.pas inside the zip file, compile and execute it.. -

When you want to delete files inside the archive you have to call the 
DeleteFiles() method , the DeleteFiles() method will not delete the 
files, it will mark the files as deleted , but it will not delete the 
files , when you want to delete completly the files , you have to call 
the DeletedItems() method to see how many files are marked deleted and 
after that you use the Clean() method to delete completly the file from 
the archive. I have implemented it like that, cause it's better in my 
opinion..

Other than that, you have to call the LoadIndex() just after you create 
your TPZArchiver object with the constructor, it's mandatory, and by 
calling the LoadIndex() method , my Parallel archiver will be fault 
tolerant to power failures etc.

You can give the following CompressionLevel: zcNone or zcLevel1 to zcLevel9.

And my parallel archiver uses a hashtable to store the file names and 
there corresponding file positions so that you can direct access to 
files inside the archive when decompressing, and deleting etc. so it's 
very fast.

Also, i have included the FindFile component, it's very easy to use, 
here is how to use it:
ff:=TFindFile.create(nil); // the constructor
ff.recurse:=true; // recurse on directories
ff.directory:='c:\zip'; // your directory
ff.Attributes:=[ffArchive];
ff.filter:='*.*'; // your files..
ff.execute; // and execute

After that you pass the ff.files (that is a TStrings) to the AddFiles() 
method.

That's very easy.

Pealse look at the test.pas demo inside the zip file to see how to use 
my Parallel archiver.

And please don't use directly the ParalleZlib.pas that i have included 
inside the Parallel archiver zip file, cause i have modified it to work 
correclty with my Parallel archiver.

If you want to use my ParallelZlib library just download it from my 
website, or download my other Parallel compression library.

In the near future i will add parallel AES encryption, and also i will 
add LZMA , LZ and BZip compressions and decompressions, and i will add 
support for memory streams, and i will port it to Linux and Mac OSX(x86).
You also will be able to use my Parallel archiver as a hashtable from 
the hardisk with 0(1) access, you can for example
stream your database row with my ParallelVarFiler into a memory stream 
or into a string, and store it with my Parallel archiver into an  
archive, and after that your can access your rows into the hardisk as a 
hashtable with O(1) access, you can use it like this as a database if 
you you have id keys that you want to map to database rows, that will be 
a good idea to
use my Parallel archiver as a hashtable. I will add the Distributed 
Reader-Writer Mutex 1.13 that
i have implemented to my Parallel archiver soon, so that you can 
parallelize the read access.

Question:

What's your newest ideas behind your parallel archiver ?

Answer:

Of course my Parallel Archiver does support Parallel commpression etc. 
but my newest ideas behind my Parallel Archiver are this:

I have played with Winzip and 7Zip , but if you want to give some files 
to extract or to test there integrity, they both (Winzip and 7Zip) will 
use sequential access and that's bad i think, so i have decided to 
implement a O(1) access that is very fast for extraction and and for 
testing the integrity etc. into my Parallel Archiver and for that i have 
used an in-memory hashtable that maintains the files names and there 
correponding file positions , and my second idea is that my Parallel 
Archiver is fault tolerant to for exemple power failures and also if 
your hardisk is full and you get file corruption etc. so my Parallel 
Archiver is fault tolerant to this kind of problems , 7Zip and Winzip i 
think are not fault tolerant to those kind of problems, and of course 
you will also soon use my Parallel archiver as a hashtable from the 
hardisk.

  have just played with 7Zip , and i have compressed 3 files into the 
archive and after than i have opened the archive with an editor and i 
have deleted some bytes and i have saved the file and after that when i 
have tried to open the archive, 7zip responded that the file is 
corrupted, so 7Zip is not fault tolerant, i think that with WinZip it's 
the same, but i have done the same test with  my Parallel archiver, and 
it's recovering from the file damage, so it's fault tolerant to this 
kind of damages, such as power failures and when also the disk is full 
and you get a file corruption etc. I have implemented this kind of  
fault tolerancy
into my Parallel archiver.

Hope you will enjoy my Parallel archiver, and i will soon extend it more.

Here is the public methods that i have implemented:
Constructor Create(file1:string,size:integer;nbrprocs:integer);
- Creates a new PZArchiver ready to use, size is the hashtable size for 
the index(Key file names and the corresponding file position ,and file1 
is the file archive, nbrprocs is the number of cores you have specify to 
run ParallelZlib in parallel.

function AddFiles;
- Add the TStringList content to the archive.

function DeleteFiles;
- Delete the TStringList content from the archive.

function ExtractFiles;
- Extract the TStringList content from the archive.

function ExtractAll;
- Extract all the files from the archive.

function Test;
- Test the integrity of the files inside the archive.

function GetInfo;
- Get the file info that is returned in a TPZArchiver record.

function ClearFile;
- Deletes all contents of the archive.

unction DeletedItems:integer
- Return the number of items marked deleted.

function LoadIndex:boolean
- Load the the the key indexed and there correpondant values from the 
file passed to the constructor.

function Exists(Name : String) : Boolean;
- Returns True if a file Name exists

procedure GetKeys(Strings : Tstrings);
- Fills up a TStrings descendant with all the file names.

function Count : Integer;
- Returns the number of files inside the archive.


PUBLIC PROPERTIES:

Items[Name : String] : Variant
- Get the file name (indexed).



You can download Parallel archiver version 1.06 from:

http://pages.videotron.com/aminer/

Language: FPC Pascal v2.2.0+ / Delphi 7+: http://www.freepascal.org/
Operating Systems: Win32 and Win64 (will be ported soon to Linux and Mac 
(x86)).
And inside defines.inc you can use the following defines:
{$DEFINE CPU32} and {$DEFINE Win32} for 32 bits systems
{$DEFINE CPU64} and {$DEFINE Win64} for 64 bits systems
Required FPC switches: -O3 -Sd -dFPC -dWin32 -dFreePascal
-Sd for delphi mode....
Required Delphi switches: -DMSWINDOWS -$H+ -DDelphi



Thank you,
Amine Moulay Ramdane.

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Parallel archiver version 1.06 , stable version... aminer <aminer@toto.ca> - 2013-02-20 09:15 -0800
  Re: Parallel archiver version 1.06 , stable version... aminer <aminer@toto.ca> - 2013-02-20 10:13 -0800

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