• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
csisy

TotalCmd - delete file from a custom pack

6 posts in this topic

Hi,

I've written a Total Commander packer plugin which is working: now, I can create, open and unpack archives, and of course unpack one or more file(s). The structure for each file is:

[i][name length][/i]
[i][name][/i]
[i][creation time][/i]
[i][data length][/i]
[i][data][/i]

My problem comes with deleting files: I don't know any solution to delete a part of a file, but what if I want it? E.g. I have 3 files in the pack and I want to delete the 2nd file.

Is there any good solution for this problem?

My first thought was that I create a new temp file, open the "old" archive, and write its content to the temp file, of course skip the part I want to delete, then close the files, overwrite the archive with the temp file and of course delete the temp file. But I think it isn't the best solution :)

The pack files should be up to 2Gb.

Thanks for your replies, I hope you can help me.
0

Share this post


Link to post
Share on other sites
Well, it may not feel nice, but that's the way to do it. If you're hoping for some sort of delete part of file and have the rest data get moved upwards, there is no such thing.
1

Share this post


Link to post
Share on other sites
That doesn't sound good :( The .zip uses the same solution? Because delete a file from a zip file is really fast. :)
0

Share this post


Link to post
Share on other sites
Not sure if there are any special considerations for Total Commander plugins, but in general the way you would do what you want is exactly what Endurion says you can't. You open the file, move your file pointer to the beginning of the packed file you want to delete, then move the data following the current file up and truncate the file. There is no need to use temporary files.
1

Share this post


Link to post
Share on other sites
Deleting from a .zip is seemingly fast, since the entries are compressed each by it own. Any decent packer will do what you described to remove an entry.

Basically removing a file from a .zip doesn't involve any decompression/recompression at all.
1

Share this post


Link to post
Share on other sites
Having to (re)process all of the files is expected for the so-called solid archives -- http://en.wikipedia.org/wiki/Solid_compression (note the "Costs" part).
If a given data compression format isn't using solid compression (it may depend on the settings used when compressing), individual processing is possible (however, the compression ratio is usually worse).
BTW, Total Commander has a pretty good support forum, perhaps you can have a better luck there: http://www.ghisler.ch/board/index.php?language=english
1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0