GTAKid667 at 23:35, 11 January 2019

2019-01-11T23:35:21Z

The hero at 15:01, 1 August 2017

2017-08-01T15:01:01Z

The hero: Created page with "In GTA Liberty City Stories and Vice City Stories Rockstar Leeds used a reloctable chunk format for all types of data. struct base::sChunkHeader { uint32 ident; uint32..."

2017-08-01T14:55:47Z

Created page with "In GTA Liberty City Stories and Vice City Stories Rockstar Leeds used a reloctable chunk format for all types of data. struct base::sChunkHeader { uint32 ident; uint32..."

New page

In GTA Liberty City Stories and Vice City Stories Rockstar Leeds used
a reloctable chunk format for all types of data.

struct base::sChunkHeader
{
uint32 ident;
uint32 shrink;
uint32 fileEnd;
uint32 dataEnd;
uint32 relocTab;
uint32 numRelocs;
uint32 globalTab;
uint16 numClasses;
uint16 numFuncs;
};

Where ident is a character constant and shrink is a boolean
that coincides with the game's decision to free the relocation
tables after loading. It is checked together with the character
constant but does otherwise not seem to be used directly for anything.
In the following all offsets are from the beginning of the chunk header.

The different file types are:

{| class="wikitable"
| ident
| shrink
| description
|-
| WRLD
| 0
| level
|-
| GTAG
| 1
| resource image/game data
|-
| mdl
| 0
| 3d model
|-
| tex
| 0
| texture
|-
| anim
| 0
| animation
|-
| col2
| 0
| collision
|-
|}

FileEnd and DataEnd are offsets to the end of file and actual data respectively.

After the data comes a relocation table (at offset relocTab with numRelocs entries)
that contains offsets to all pointers in the data. On load those pointers (stored
as offsets in the file) are converted to pointers by adding to them the address of
the loaded file in memory.

After the relocation table comes a table of class and function fixups (at offset
globalTab with numClasses class fixups and numFuncs function fixups).
The class values in the file are hashes of their class names and are replaced
by pointers to the vtable on load.
The function values are indices that are replaced by function pointers.
Class fixups are used for the classes stored in game.dtz. Function
fixups are used for atomic render callbacks.

The actual contents of the files are then just C(++) structures with relocated
(local) pointers, vtables and function pointers. These are described elsewhere.

[[Category:3D File Formats]]
[[Category:GTA LCS]]
[[Category:GTA VCS]]

@@ Line 72: / Line 72: @@
 (local) pointers, vtables and function pointers. These are described elsewhere.
 [[Category:File Formats]]
 [[Category:GTA VCS]]

Relocatable chunk - Revision history

GTAKid667 at 23:35, 11 January 2019

The hero at 15:01, 1 August 2017

The hero: Created page with "In GTA Liberty City Stories and Vice City Stories Rockstar Leeds used a reloctable chunk format for all types of data. struct base::sChunkHeader { uint32 ident; uint32..."