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joakim

ZIP STRUCTS UDF (from scratch)

9 posts in this topic

As promised, here is my zip-from-scratch udf. It is not at all a substitute for any of the other functional udf's, but merely a good base if doing it from scratch yourself. I have used this code myself s part of a steganographic example with ooXML documents (but excluded from this udf), and it is very nice when you have such control over a zip file without being dependant on external libraries.

The code will currently only generate three global 2-dimensional arrays;

1. The local file headers.
2. The central directory headers.
3. The central directory end.

The data descriptor, which is rarely used, is not included. However, I believe most fields are included in the arrays.

When working with the zip content, it is advisable to use Ward's machine code udf's for zlib and crc32 (compression and checksum). It works fine on both x86 and x64.

If you wonder what the heck you would need this for, then you probably don't need it, so move on.

Anyways, apoligies for the weird coding style and variable names. I doubt that I will have time to expand on this udf, which is the reason I share it incase others feel like.

Link to some documentation; http://en.wikipedia.org/wiki/Zip_(file_format) and http://www.pkware.com/documents/casestudies/APPNOTE.TXT

Joakim

ZIP_STRUCTS.au3

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Anyways, apoligies for the weird coding style and variable names.

Joakim

No need to apologies, it helps to a better understanding !

Nice work. :)


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Hmm, what an enormous download eager in just 1 day... (2335) Is there something wrong with the counter perhaps.

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That count does seem amazing.

Thanks for sharing!


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#5 ·  Posted (edited)

Ya.. At this time the thread shows its been viewed 209 times. Not sure how the downloads could even possibly get up to 6600. Good post about Zip though :)

Edited by Beege

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Download managers make several connections for one download. One download can be read as 100 sometimes. The counter might be bugged.


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eMyvnE

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Hello
An interesting piece of code.
Are there any chances of continuation?

Best regards

mLipok


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My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 - BETA * ADO.au3 UDF SMTP Mailer UDF *

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No, not from me.

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It's a shame.
It's hard.

But thanks for the earlier effort.

mLipok


Signature beginning:   Wondering who uses AutoIT and what it can be used for ?
* GHAPI UDF - modest begining - comunication with GitHub REST API *
ADO.au3 UDF     POP3.au3 UDF     XML.au3 UDF    How to use IE.au3  UDF with  AutoIt v3.3.14.x  for other useful stuff click the following button

Spoiler

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind. 

My contribution (my own projects): * Debenu Quick PDF Library - UDF * Debenu PDF Viewer SDK - UDF * Acrobat Reader - ActiveX Viewer * UDF for PDFCreator v1.x.x * XZip - UDF * AppCompatFlags UDF * CrowdinAPI UDF * _WinMergeCompare2Files() * _JavaExceptionAdd() * _IsBeta() * Writing DPI Awareness App - workaround * _AutoIt_RequiredVersion() * Chilkatsoft.au3 UDF * TeamViewer.au3 UDF * JavaManagement UDF * VIES over SOAP * WinSCP UDF * GHAPI UDF - modest begining - comunication with GitHub REST API *

My contribution to others projects or UDF based on  others projects: * _sql.au3 UDF  * POP3.au3 UDF *  RTF Printer - UDF * XML.au3 - BETA * ADO.au3 UDF SMTP Mailer UDF *

Useful links: * Forum Rules * Forum etiquette *  Forum Information and FAQs * How to post code on the forum * AutoIt Online Documentation * AutoIt Online Beta Documentation * SciTE4AutoIt3 getting started * Convert text blocks to AutoIt code * Games made in Autoit * Programming related sites * Polish AutoIt Tutorial * DllCall Code Generator * 

Wiki: Expand your knowledge - AutoIt Wiki * Collection of User Defined Functions * How to use HelpFile * Best coding practices * 

IE Related:  * How to use IE.au3  UDF with  AutoIt v3.3.14.x * Why isn't Autoit able to click a Javascript Dialog? * Clicking javascript button with no ID * IE document >> save as MHT file * IETab Switcher (by LarsJ ) * HTML Entities * _IEquerySelectorAll() (by uncommon) * 

I encourage you to read: * Global Vars * Best Coding Practices * Please explain code used in Help file for several File functions * OOP-like approach in AutoIt * UDF-Spec Questions *  EXAMPLE: How To Catch ConsoleWrite() output to a file or to CMD *

"Homo sum; humani nil a me alienum puto" - Publius Terentius Afer
"Program are meant to be read by humans and only incidentally for computers and execute" - Donald Knuth, "The Art of Computer Programming"
:naughty:  :ranting:, be  :) and       \\//_.

Anticipating Errors :  "Any program that accepts data from a user must include code to validate that data before sending it to the data store. You cannot rely on the data store, ...., or even your programming language to notify you of problems. You must check every byte entered by your users, making sure that data is the correct type for its field and that required fields are not empty."

Signature last update: 2017-06-04

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