XeNTaX

10. Data Files Structure
------------------------
The structure of the data files are the same in all three of the Power of Chaos
games. There two files in which all of the information is stored:

data.dat - everything except sound data (text files [*.txt], bitmaps [*.bmp],
opponent decks [*.ydc], etc.)
Voice.dat - sound data (sound effects, music, and voice-overs [*.wav])

Both of them operate the same way:
Offset: Purpose:
0-7 (8 bytes) a tag acknowledging that the file is from Power of
Chaos
8-11 (4 bytes) (edited) NUMBER OF FILES
12-279 (268 bytes each) individual file information
280-547
...
etc.
the rest file contents

Individual file information segments consist of four parts: filename (bytes
0-255), file starting offset (256-259 bytes), uncompressed size(?) (bytes 260-
263), and compressed (in-file) size (264-267 bytes). The procedure for
extracting this information goes as follows:

filename
--------
swap the hexadecimal values of each byte and chop off the trailing zeros

NUMBER OF FILES,file offset, uncompressed size(?), and compressed size
------------------------------------------------------
byte0 + 256^1 * byte1 + 256^2 * byte2 + 256^3 * byte3

Using the file starting offset and compressed size, you can easily pull out the
file information. How the files are compressed is unknown (toss me an e-mail if
you figure it out), but most of the files are stored uncompressed, so this
isn't too much of a problem.

By the way, I've slapped together a small program that does all of this:
http://crispymarshmallow.home.comcast.net/unpacker.exe (needs Microsoft .NET
Framework 2.0)

Some stuff you might want to look at:
data.dat:
\card\*.bmp - card images
\?\file\*.ydc - the opponent's decks (? = y, k, or j)

voice.dat:
everything - all game audio is at your disposal

while InputPos < InputSize do
begin
RunLength := Input[InputPos++]
if RunLength = 0 then
begin
Count := Input[InputPos++]
for i := 1 to Count do
Output[OutPos++] := Input[InPos++]
end
else
begin
Symbol := Input[InputPos++]
for i := 1 to RunLength do
Output[OutPos++] := Symbol
end
end

TightIsRight wrote:Found this on sourceforge.net

Code: Select all

http://sourceforge.net/projects/yugiohextractor

An application that can extract, replace and view the files as cards, sound effects and music from the Yu Gi Oh! Power of Chaos PC games. It is written in C# .NET. Aplicaci�n que puede extraer y manipular los archivos de YuGiOh Power of Chaos, cartas,etc.

Translations : English, Spanish

The file name is illegible since they invert the first 4 bits with the last 4 bits of each character, or it can be described as a rotation of 4 bits toward the left or the same thing a rotation of 1 bit, 4 times toward the left. To make it llegible the inverse process should be made and rotate the bits 4 times toward the right. For example if we have the byte 0x4A (01001010) when rotating it 4 times to the right it would be 0xA4(10100100).

Step for step would be this way: (0x4A)01001010 -> 00100101 -> 10010010 -> 01001001 -> 10100100(0xA4)

Immediately after having finished all the file descriptions, they follow the data of each one of the files.

filename
--------
swap the hexadecimal values of each byte and chop off the trailing zeros

smernesto wrote:Hi.

I am the creator of yu gi oh extractor, I was reading the forum.

If you have more information about how works the files in the game please write me at [email protected].

I never knew how read the text files in the game.

Bye

Ernesto Gutierrez Arrazola