OBD:Oni2AS

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The Oni 2 dev disc from Angel Studios contains:

  • the main ELF executable SCPS_123.45
  • a plain-text configuration file SYSTEM.CNF
  • a SYSTEM folder containing fifteen ELF binaries (*.IRX) and a file called IOPRP255.IMG
  • the three "binary data" files BANKS.DAT, RB.DAT and STREAMS.DAT
"RB" possibly stands for "Rebirth", one of Oni2's working (sub)titles.

DAT file format (file table)

The common format of the three "binary data" files is as follows (illustrated on the example of RB.DAT).

Offset Type Raw Hex Value Description
0x00 4CC 44 41 56 45 "DAVE" a control code
0x04 int32 18 41 00 00 16664 number of file table entries (files or folders)
0x08 offset 00 18 04 00 0x41800 offset to start of file name block, from 0x800, in bytes
0x0C offset 00 30 0A 00 0xA3000 offset to start of file data block, from 0x800, in bytes
0x10 char[2032] 00 ... 0 padding
File table, first entry
0x800 offset 00 00 00 00 0x00 offset to file name, from start of file name block, in bytes
  • in this case it points to 0x800+0x41800+0x00=0x42000
  • the string at that address is actlog.txt (null-terminated)
0x804 offset BC D9 1F 02 0x21FD9BC absolute offset to file data, from start of DAT file, in bytes
0x808 int32 00 08 00 00 2048 uncompressed file size, in bytes
0x80C int32 94 00 00 00 148 compressed file size, in bytes
File table, second entry
0x810 offset 0B 00 00 00 0x0B offset to file name, from start of file name block, in bytes
  • in this case it points to 0x800+0x41800+0x0B=0x4200B
  • the string at that address is Audio/ (null-terminated)
0x814 offset 22 D3 1D 02 0x21DD322 absolute offset to file data, from start of DAT file, in bytes
  • the offset 0x21DD322 points to no actual data in this case
  • is it common to folders (as in this case) and empty files
0x818 int32 00 00 00 00 0 uncompressed file size (zero; it's a folder)
0x81C int32 00 00 00 00 0 compressed file size (also zero)
File table, third entry
0x820 offset 12 00 00 00 0x12 offset to file name, from start of file name block, in bytes
  • in this case it points to 0x800+0x41800+0x0B=0x42012
  • the string at that address is Audio/banks/ (null-terminated)
0x824 offset 22 D3 1D 02 0x21DD322 absolute offset to file data, from start of DAT file, in bytes
  • the offset 0x21DD322 points to no actual data in this case
  • is it common to folders (as in this case) and empty files
0x828 int32 00 00 00 00 0 uncompressed file size (zero; it's a folder)
0x82C int32 00 00 00 00 0 compressed file size (also zero)
File table, fourth entry
0x830 offset 1F 00 00 00 0x1F offset to file name, from start of file name block, in bytes
  • in this case it points to 0x800+0x41800+0x1F=0x4201F
  • the string at that address is Audio/banks/attack.bd (null-terminated)
0x834 offset 00 00 53 06 0x6530000 absolute offset to file data, from start of DAT file, in bytes
0x838 int32 90 09 03 00 199056 uncompressed file size, in bytes
0x83C int32 13 85 02 00 165139 compressed file size, in bytes
...etc (rest of the file table)

The file table format is apparently a PS2 standard, and there are free tools like Game Extractor (basic version) that can display the folder structure and file sizes, and extract uncompressed files. However, while Game Extractor correctly identifies the compressed and uncompressed file sizes, it apparently does not know what the compression algorithm is (at least in the free version, the compressed files are extracted as-is, and are thus unusable). Only very short files are packed without compression (mostly trivial-looking stub files of little interest).

After some forum lurking, it becomes clear that the compression algorithm is ZIP, or rather "deflate", in its most common implementation (open-source ZLIB library). However, the compressed files have no ZIP header, so the decompressor/compressor must use the right default settings for this to work. The correct setup is as follows:

z_stream infstream; // initialization of the "inflate" stream
infstream.zalloc = Z_NULL;
infstream.zfree = Z_NULL;
infstream.opaque = Z_NULL;

infstream.avail_in = (uInt)(size_comp); // size of compressed input
infstream.next_in = (Bytef *)file_comp; // input file (char array)
infstream.avail_out = (uInt)(size_orig); // size of decompressed output
infstream.next_out = (Bytef *)file_orig; // output file (char array)
    
// the actual DE-compression work.
inflateInit2(&infstream,-15);
inflate(&infstream, Z_NO_FLUSH);
inflateEnd(&infstream);

The important line, which defines the decompression rules, is inflateInit2(&infstream,-15). -15 means maximum compression and no header. For more details, c.f. the ZLIB documentation.

With proper decompression, the DAT files extract as follows: BANKS.DAT RB.DAT STREAMS.DAT

  • STREAMS.DAT holds 22 *.stm files (21 vocalization sounds and 1 musical piece). See below for the STM format and a link to the converted sound files.
  • BANKS.DAT holds 13 sound sets, each of which is a pair of a *.hd file (similar to Oni's OSGr?) and a corresponding *.bd file (similar to a group of Oni's SNDD bundled together). The *.bd files in BANKS.DAT are identical to the ones stored in RB.DAT (in the Audio/banks/ folder), and possibly redundant. The *.hd files are not duplicated in RB.DAT, which instead has plain-text *.td files (apparently all three file types are supposed to work together, but perhaps *.hd is just a binary version of *.td with some additional features)
  • RB.DAT holds all the rest of the game data: textures, levels, characters, animations, scripts, etc.

Commonplace file formats

Some of the files in RB.DAT are either in plain text or in otherwise widely known formats that can be opened by third-party programs. Here is the list of such commonplace formats used in Oni 2.

  • *.txt : Text files. Some in Windows format (CR+LF at EOL), some in Unix format (only LF at EOL)
  • *.mb : Binary file used by Maya 3D program (work-in-progress models of some characters and props)
  • *.mb.swatches : Maya swatches, whatever they are. There are also *.mel files (plain text)
  • *.wav : WAV. A common format for the uncompressed storage of sounds (through pulse-code modulation)
  • *.tga : Targa. A versatile texture format that supports RLE compression, MIP map storage, indexed as well as RGB color schemes, and transparency (and therefore is widely used in games).
  • *.xml : XML.
  • *.cue : Cue sheet. Occurs only once, as rb.cue at the root of RB.DAT
  • *.m2v : MPEG-2. Video files. Occur in the form of movies/angel.m2v and movies/rockstarlogo.m2v
  • *.doc : Microsoft Word file
  • *.xls : Microsoft Excel file
  • *.psd : Adobe Photoshop file
  • *.tif : TIFF image file
  • *.lnk : Microsoft shortcut

Plain text file formats

Apart from XML files (and some TXT and *.log files; mostly debug logs), Oni 2 has many custom plain-text files, listed below.

Save files - occurs only in the form of sample.oni2save at the root of RB.DAT

Template files - occurs only in the form of template/rb.template and a couple of layout.template files (see Layout files below)

Graph files - files ending in .graph, found in layout/*/

Layout files - files that specify the layout of a level. They're called names like layout.actors, layout.et (entities), layout.graphs, layout.groups, layout.lights, layout.paths, layout.fog, layout.atktab (attack table), layout.template, layout.campack (also layout.campacknew), layout.bnds (bounds)

Environment settings - occurs only in the form of default.environment files in various layout/*/ folders

"rb" files - core settings of some sort found in Settings/: rb.ammo, rb.expl (explosions), rb.formations, rb.fx (effects), rb.gamedata, rb.gt, rb.inventory, rb.patterns, rb.proj (projectiles), and rb.weap (weapons). Also Audio/rb.audiopackages and fx/rb.fxe, as well as the aforementioned template/rb.template. ("rb" possibly stands for "Rebirth", one of Oni2's working (sub)titles.)

UI files - two files ending in .ui, found in Settings/: rbfrontend.ui and rbgame.ui

Tuning files - two files ending in .tune, found in Settings/: pad.tune and pad_before_massive_tuning.tune

Script files - files ending in .oni, rather similar to BSL. Can be compiled into binary *.onc files.

Model files - files ending in .mod (or .mod.bak or .mod.old) or .xmod. Version 1 format is plain-text, version 2 is binary (see below for both).

Pathfinding files - files ending in .room and .bsp, found in Level/*/

Mesh files - files ending in .mesh, found in Level/*/ (pathfinding) or Entity/*/ (explosions and gun flares)

Fighting state machines - files ending in .fsm, found in Statemachine/

Attack patterns - files ending in .atk, found in Statemachine/ and layout/fightai_grapple/statemachine_backup/

Formation files - files ending in .frm, found in Settings/, apparently something to do with the GUI page layout.

HUD setting files - occurs only in the form of Settings/HUD_Settings.hud

Control mapping files - occurs only in the form of Settings/control.map

Particle files - files ending in .ptx, found in Settings/

Shader files - files ending in .shader, used as an intermediate between models and their textures.

"Neat" files - two files ending in .neat in Entity/kno/ (apparently improved .shader files)

Attack FX tables - files ending in .attackfxtable, found in fx/

Effect lists etc - files ending in .fxl and .fxm, found in fx/

Jump files - files ending in .jump, found in entity.tune/animpkg/nav/

Locomotion files - files ending in .loco, found in entity.tune/animpkg/nav/, and in the respective folders of some character entities.

Blocking files - files ending in .blk, found in entity.tune/*/, and in the respective folders of some character entities.

Reaction files - files ending in .rct, found in entity.tune/*/

Animation packages - files ending in .apkg (and .apkg.txt), found in entity.tune/animpkg/. Also, template file entity.tune/animpkg/nav/nav.tpkg

Animation collections - files ending in .anims or .Anims, found in entity.tune/*/, and in the respective folders of some animated entities.

Attack data files - files ending in .atdt (or .atdt.bak), found in entity.tune/*/, and in the respective folders of some character entities.

Attack collections - files ending in .attacks, found in entity.tune/*/, and in the respective folders of some character entities.

Attachment files - occurs only in the form of entity.tune/erc/erc.attach

Fighter data - occurs only in the form of entity.tune/kno/kno.ft

Weapon data - files ending in .weap, found in entity.tune/*/. Possibly related to Settings/rb.weap

Sound library - files ending in .sndlib, found in entity.tune/*/

BFG files - files ending in .bfg, found in layout/*/ and Entity/*/

MMB files - files ending in .mmb, found in layout/*/

Entity type - files ending in .type, found in Entity/*/ (mostly entity.type or Entity.type)

Bounds and physics - files ending in .bnd (mostly Bound.bnd or Bound#.bnd) and .phys (either Bound.phys or Bound#.phys), found in Entity/*/

Shape files - files ending in .sha, found in Entity/*/

Skeleton files - files ending in .skel, found in Entity/*/ for rigged/animated models

Edge files - files ending in .em, found in Entity/*/ (for character collision?)

Gait files - files ending in .gait (or .gait.bak), found in Entity/*/ for characters (a gait is a "manner of walking")

TC files - files ending in .tc, found in Entity/*/ (apparently for animated textures; "texture collection"?)

Playback files - files ending in .play, found in Entity/jae/ and Entity/krk/

"lot" files - files ending in .lot, found in Entity/ (lists of *.mb files). Also Entity/back.lot.withTemplates

"ini" files - occurs only in the form of Entity/button.ini

"mel" files - apparently Maya project definition (plain text)

"attr" and "geom" - only occur as Entity/proxy/exportTMP/exportTmp/set_temp1.attr and Entity/proxy/exportTMP/exportTmp/static.geom

Some plain-text files do not have an "extension". Usually those are either empty files, or dummy files of an identifiable type. Examples are tim_atk_FCH1_rht_pch_uprcutreadme (a plain-text "readme" file), trashpath and guardpos (unused stubs of .oni-like scripts), ack (some kind of skeleton data for Konoko) and pants

STM file format (sound stream)

There are some regular WAV files in Audio/banks/wav/ [and some audio streams encoded in the *.bd' files, not yet reverse engineered at the time of writing geyser (talk) 01:40, 6 February 2018 (CET) ], but there is also a WAV-like format called STM (unrelated to the MIDI-like STM file mentioned on Wikipedia).

To be documented later. The WAV files obtained after conversion can be found HERE

TEX file format (texture)

A texture format similar to Oni's TXMP.

To be documented later. The TGA images obtained after conversion can be found HERE

Some of the textures are temporary or alternative copies, and so their filenames don't end in .tex but .tex.old or .tex.highRes

MOD file format (plain text)

Most of Oni 2's models are in a plain text format identified as "version: 1.10".

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MOD file format (binary)

The more recent model format is a binary format identified as "version: 2.10". Apart from the more compact binary storage, it seems equivalent to the plain-text 1.10 format described above.

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SNE file format (binary)

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HD and BD file format (binary)

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ANIM file format

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