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      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.
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radioteeth

Implementing a Registry-style Database

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Hi all,

I'm working on a project at the moment that calls for a windows-style registry system, which ultimately I would like to implement in a way that stores everything as one file.

The goal is to allow for directory-style addressing of various items stored in the registry, much akin to the windows registry system. Windows itself seems to store the registry as a 'hive'. The goal here is fast read/write operations so that if anything were to happen, eg: program crashes or the machine/device unexpectedly dies or shuts down there won't be an issue of data that was in memory but didn't get written to the registry file on exit or at whatever autosave intervals, etc..

I'm not sure how to store this file, or how to interact with its contents in memory, as they will be mirrored for fast operations, and once operations are complete on the data in memory they will be written to the registry file.

Any ideas on file format? How to work with it? I thought perhaps emulating a FAT system would be interesting, or maybe just creating a blank file to act as an allocated chunk of space, and if it ever fills up just create another one, etc... I don't mind having multiple files, I was considering perhaps just using physical files, but some data are going to be very small, and cluster allocation size on different disk devices will cause these small files to be represented by 100x their size as cluster granularity isn't accustomed to such small data.


EDIT: Another requisite functionality is the ability to timestamp the database each time something is added/removed for the sake of being able to generate delta-compressed updates where if the database needs to be mirrored across two or more machines they can easily compare their most recent timestamps and the machine with the most recent up-to-date database can use the last timestamps of remote databases to generate compact updates for the remote databases to be made current. Edited by radioteeth
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Have a look at the HDF5 format: [url="http://en.wikipedia.org/wiki/Hierarchical_Data_Format"]http://en.wikipedia....cal_Data_Format[/url]

You can store arbitrarily-structured data in a single binary file. Libs are available to for most major languages, including Java, Python, and Matlab. I'm sure there are C/C++ libs available as well (I haven't used them).

You can also use compression on the data (gzip, etc.).

h5py is a nice hdf5 library for python. I know this thread is tagged with "C", but this tutorial gives you a good sense of what you can do with HDF: [url="http://code.google.com/p/h5py/wiki/HowTo"]http://code.google.c...h5py/wiki/HowTo[/url] . Using h5py/python might also be a nice way to prototype things (if you're already familiar with python).

EDIT: Your last requirement (in your 'EDIT') might be difficult to accomplish. You'll probably have to cook your own solution. But, still the HDF5 format should suffice for the data storage. Edited by thok
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The registry is, at heart, just a hierarchical database, so look for some hierarchical database libraries for starters. A directory service would also do the trick here - on Windows you could probably use Active Directory Application Mode, or if you want to be portable you could grab some other lightweight LDAP directory.
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