Archive for the ‘File format’ Category

Death Rally config file

I think the file dr.cfg is the only file in this game that there is not crypted!

The structure is as follows:

Offset (byte) Size (bytes) Information
0 4 Master volume
4 4 Music volume
8 4 ?
12 4 Difficulty
16 4 Use joystick
20 4 ?
24 4 ?
28 4 ?
32 4 ?
36 4 ?
40 1 ?
41 4 ?
45 4 ?
49 4 ?
53 4 ?
57 4 ?
61 1 ?
62 4 ?
66 4 ?
70 4 ?
74 4 ?
78 2592 Circuit record
2670 200 Hall of fame record
2870 4 Acceletate key
2874 4 Brake key
2878 4 Left steering key
2882 4 Right steering key
2886 4 Turbo key
2890 4 Gun key
2894 4 Mine key
2898 4 Horn key
2902 4 Acceletate gamepad key
2906 4 Brake gamepad key
2910 4 Left steering gamepad key
2914 4 Right steering gamepad key
2918 4 Turbo gamepad key
2922 4 Gun gamepad key
2926 4 Mine gamepad key
2930 4 Horn gamepad key
2934 4 Times played

Death Rally Shareware/Full version savegame in detail

Hi to all,

As user Simo develops a savegame editor (great utility!) based on my investigations of the Death Rally executable I want to publish the format of the savegames in the full and shareware version.

Savegame files are crypted using the first byte of the file.

The file structure is:

Offset (byte) Size (bytes) Information
0 1 Crypt key
1 1 Driver id
2 1 Use weapons (true-false)
3 1 Dificulty (1-3)
4 15 Savegame name
19 108*20 Drivers’s data

Driver’s data is as follows:

Offset (byte) Size (bytes) Information
0 12 Name
12 4 Damage
16 4 Engine upgrade (0-4)
20 4 Tyre upgrade (0-4)
24 4 Armour upgrade (0-4)
28 4 Car type(0-5)
32 4 ?
36 4 ?
40 4 ?
44 4 Colour
48 4 Money
52 4 Loan Type
56 4 Loan races left
60 4 Actual car value
64 4 Face id
68 4 Points
72 4 Rank
76 4 Races won
80 4 Total races
84 4 Last race income
88 4 Total income
92 4 Mines purchased (number of mines)
96 4 Spikes purchased
100 4 Rocket purchased
104 4 Sabotage purchased

The main diference between shareware and full version it is that full version savegame is a 2179 bytes file while shareware savegame occupies 2195 bytes. The only difference are the extra bytes that the shareware version has.

To know how to decrypt the full version file see https://github.com/enriquesomolinos/DreeRally/blob/master/tools/savegameDecrypt.py

In order to crypt the full version file you can use: https://github.com/enriquesomolinos/DreeRally/blob/master/tools/savegameCrypt.py

To know how to decrypt the shareware file see Shareware savegame decryptor

In order to crypt the shareware file you can use: Sahreware savegame crypt

 

Bpa files

All this information is extractd from http://www.shikadi.net/moddingwiki/Death_Rally_BPA_Format thanks to  Ceidwad.

Header
======

| Data type                                  | Description|
| UINT32LE numFiles                | Number of files in the archive|
| FILEREC[255] fileRecords      |  Encrypted FAT   |

Each FILEREC is of the form

| Data type           |Name                     | Description|
| char[13]               | encryptedName    | Encrypted filename, padded with non-encrypted 0x00 bytes|
|  UINT32LE         | size                          | Size of the file data   |

The FILEREC table has a fixed size of 255 * 17 bytes, padded with null bytes, and cannot contain more than 255 FILERECs. Compressed file data begins immediately after the table, at offset 0x10F3. Because the header does not store offsets, these must be calculated by accumulating through the table.

The file content is not compressed or encrypted by the archive itself, however many of the files typically found in this archive are already encrypted as part of their respective file formats.

Filename encryption
================
To restore a filename, subtract 117 – 3 * index from each byte, where index is the 0-based index of the byte in the filename. This will yield a non-null-terminated string in uppercase. The encrypted filename is null-terminated (the terminating/padding null bytes are not encrypted).

Tools
=======
To extract Bpa files you can use the tool called bpaextractor.py in the project.

Pal files

Is most cases this is files are standard VGA palettes that contains 256 colours. Each color is represented in 3 bytes.

Death rally file formats uncovered

In the next few days I will explain how to undestand the most important files in Death Rally.

At this moment, before  a decompilation phase I kwon how to extract the BPA files, how is the HAF format, how to transform the CMF files (music files) to a understandable format that you can play with VLC, and the most difficult one, the BKP (images) files that needs the use of the PAL files.

This information is very useful to the begining of the project, because the idea is to use the original files.

 

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