ARC (Gotcha Force): Difference between revisions

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← Gotcha Force

This article is about Gotcha Force ARC file format and ongoing researches on it.

This file format needs more research.
Researches on headers / bodies structures are partially achieved.

ARC seems to be the diminutive of archive.

Format

In the main executable boot.dol we found the debug string "Archive_Parse: Byte-Order mismatch" related to HSD (HAL SysDolphin) archives. The "Super Smash Bros. Melee" GameCube community has reversed this HSD lib function (Gotcha Force use not the same HSD lib version):

hsd archive.h

hsd archive.c

All ARC files named with _mdl in their title are HSD models.

Header

The HSD header seems to match others ARC headers:

typedef struct _HSD_ArchiveHeader {
    u32 file_size; // 0x00
    u32 data_size; // 0x04
    u32 nb_reloc;  // 0x08
    u32 nb_public; // 0x0C
    u32 nb_extern; // 0x10
    u8 version[4]; // 0x14
    u32 pad[2];    // 0x18 In debugging there is 4 bytes pad / not 2
} HSD_ArchiveHeader;

Observations

Unused textures

In the afs_data.afs (USA/NTSC version) we find 3 unused textures which have possibly been used in the game demo:

nwld00_mdl.arc
nwld01_mdl.arc
nwld02_mdl.arc

All headers of the "afs_data.afs" have been verified without decompress using automated scripts. PZZ files haven't been verified except for HSD models. ARC files seems to use this information. "Archive_Parse: Byte-Order mismatch" is referenced twice in the code (USA/NTSC dol version) boot.dol at addresses 8004d548 and 80006c88.

8004d548 is called when starting the game. We get HSD_archiveParse(*bufferDest=r3=0x81489c40, *bufferSrc=r4=0x80f2b1c0, len?=r5=0x4d7b). We found back arg (*bufferSrc) as a pointer to an ARC file like.

@@ Line 1: / Line 1: @@
 [[Gotcha Force | &larr; Gotcha Force]]
-''Cet article est pour les format de fichiers ARC de Gotcha Force. Voir [[ARC (Format de fichier)]] pour les autres versions de ce fichier.''
+''This article is about Gotcha Force ARC file format and ongoing researches on it.''
-<br>
+{{Research | 2| Researches on headers / bodies structures are partially achieved. }}
-<div style="overflow-x:auto;">
-{| style="padding:0px; margin:0px; width:100%; background-color: transparent; white-space:nowrap;" cellspacing="3"
-| colspan="2" |
-{| style="padding:0px; background-color: transparent;" width="100%"
-| style="width:18%; text-align:center; white-space:nowrap;" |
-<div style="font-size:195%; color: red;">Cette section a besoin de beaucoup de recherche.</div>
-<div style="font-size: 125%; color: red;">Des recherches sur l'algorithme et comment interagit le fichier sont nécessaire. </div>
-|}
-|}
-</div>
-<br>
-ARC semble être le diminutif d'archive.
+ARC seems to be the diminutive of '''arc'''hive.
-__toc__
+== Format ==
-== Format ==
+In the main executable '''boot.[[DOL (File format)|dol]]''' we found the debug string "Archive_Parse: Byte-Order mismatch" related to HSD ('''H'''AL '''S'''ys'''D'''olphin) archives. The "Super Smash Bros. Melee" GameCube community has reversed this HSD lib function (Gotcha Force use not the same HSD lib version):
-On retrouve dans l'exécutable principal Start.dol l'usage de la chaîne de caractère <span class="pl-s"><span class="pl-pds">"</span>Archive_Parse: Byte-Order mismatch". La communauté du jeu GameCube "Super Smash Bros. Melee" a notamment reverse cette fonction de la librairie HSD (rien n'indique que la version de HSD soit la même, il faudrait vérifier) :<span class="pl-pds"></span></span>
+[https://github.com/PsiLupan/FRAY/blob/master/src/hsd/hsd_archive.h hsd archive.h]
-<span class="pl-s">[https://github.com/PsiLupan/FRAY/blob/master/src/hsd/hsd_archive.h hsd archive.h]</span>
+[https://github.com/PsiLupan/FRAY/blob/master/src/hsd/hsd_archive.c hsd archive.c]
-<span class="pl-s">[https://github.com/PsiLupan/FRAY/blob/master/src/hsd/hsd_archive.c hsd archive.c]</span>
+All ARC files named with '''_mdl''' in their title are HSD [[Models|models]].
 === Header ===
-<span class="pl-s">Le header de l'archive HSD correspond aux headers des fichiers ARC :</span>
+The HSD header seems to match others ARC headers:
   typedef struct _HSD_ArchiveHeader {
- &nbsp; &nbsp; u32 file_size; /* 0x00 */ 0x4d7b
+     u32 file_size; // 0x00
- &nbsp; &nbsp; u32 data_size; /* 0x04 */ 0x49c8
+     u32 data_size; // 0x04
- &nbsp; &nbsp; u32 nb_reloc; &nbsp;/* 0x08 */ 0xe0
+     u32 nb_reloc;  // 0x08
- &nbsp; &nbsp; u32 nb_public; /* 0x0C */ 1
+     u32 nb_public; // 0x0C
- &nbsp; &nbsp; u32 nb_extern; /* 0x10 */ 0
+     u32 nb_extern; // 0x10
- &nbsp; &nbsp; u8 version[4]; /* 0x14 */ 0
+     u8 version[4]; // 0x14
- &nbsp; &nbsp; u32 pad[2]; &nbsp; &nbsp;/* 0x18 */ on a seulement un pad de 4 octets / pas 8 dans le débogage ;
+     u32 pad[2];    // 0x18 In debugging there is 4 bytes pad / not 2
   } HSD_ArchiveHeader;
+== Observations ==
+=== Unused textures ===
+In the afs_data.afs (USA/NTSC version) we find 3 unused textures which have possibly been used in the game demo:
+* nwld00_mdl.arc
+* nwld01_mdl.arc
+* nwld02_mdl.arc
+[[File:Array 0 nwld00 mdl.arc.png.png|300px]] [[File:Array_0_nwld01_mdl.arc.png|300px]] [[File:Array 0 nwld02 mdl.arc.png|300px]]
+All headers of the "afs_data.afs" have been verified without decompress using automated scripts. [[PZZ (Gotcha Force)|PZZ]] files haven't been verified except for HSD models. ARC files seems to use this information. "Archive_Parse: Byte-Order mismatch" is referenced twice in the code (USA/NTSC [[DOL (Gotcha Force)|dol]] version) boot.dol at addresses 8004d548 and 80006c88.
-Tous les headers des fichiers de "afs_data.afs" ont été vérifiés directement, sans décompression ou autre. Les fichiers compressés dans les PZZ n'ont pas été vérifiés par exemple. Seul les fichiers ARC utilisent des informations qui semblent correspondre à ce header. La fonction utilisant la chaîne de caractère <span class="pl-s"><span class="pl-pds">"</span>Archive_Parse: Byte-Order mismatch" est référencée deux fois dans Start.dol aux adresses 8004d548, et 80006c88. </span>
+* 8004d548 is called when starting the game. We get HSD_archiveParse(*bufferDest=r3=0x81489c40, *bufferSrc=r4=0x80f2b1c0, len?=r5=0x4d7b). We found back arg (*bufferSrc) as a pointer to an ARC file like.
-<span class="pl-s">8004d548 est appelé une fois au lancement du jeu. </span><span class="pl-s">On y retrouve HSD_archiveParse(*bufferDest=r3=0x81489c40, *bufferSrc=r4=0x80f2b1c0, len?=r5=0x4d7b). On a bien en argument (*bufferSrc) un fichier qui ressemble aux fichiers ARC.</span><span class="pl-s"></span>
-[[Catégorie:Format de fichier]]
+[[Category:File format]]
-[[Catégorie:Gotcha Force]]
+[[Category:Gotcha Force]]