UnHavok.cpp

John76

Newbie

Posts: 3

UnHavok.cpp

« on: May 04, 2020, 22:15 »

Hi,

Can someone help me and explain about Havok model
See... UnHavok.cpp... Sub FixupHavokPackfile...

It may sound funny to you, but I'm trying to translate it into Vb.Net

for example I loaded all localfixup, globalfixup from model and now i need to do fixups

can anyone explain me this part of function
how to do the same in vb code to work,

Tnx

//////////////////////////////////////////////////////////////////////////////////////////////////////

for (LocalFixup *LF = (LocalFixup*)(SectionStart + Sec->m_localFixupsOffset);
          LF < (LocalFixup*)(SectionStart + Sec->m_globalFixupsOffset);
          LF++)
      {
         if (LF->fromOffset == 0xFFFFFFFF) continue;      // padding
//         appPrintf("Lfix: %X -> %X\n", LF->fromOffset, LF->toOffset);
         // fixup
         *(byte**)(SectionStart + LF->fromOffset) = SectionStart + LF->toOffset;
      }
      // process global fixups
      for (GlobalFixup *GF = (GlobalFixup*)(SectionStart + Sec->m_globalFixupsOffset);
          GF < (GlobalFixup*)(SectionStart + Sec->m_virtualFixupsOffset);
          GF++)
      {
         if (GF->fromOffset == 0xFFFFFFFF) continue;      // padding
//         appPrintf("Gfix: %X -> %X / %X\n", GF->fromOffset, GF->toSec, GF->toOffset);
         // fixup
         byte *SectionStart2 = PackStart + Sections[GF->toSec].m_absoluteDataStart;
         *(byte**)(SectionStart + GF->fromOffset) = SectionStart2 + GF->toOffset;
      }

//////////////////////////////////////////////////////////////////////////////////////////////////////


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Gildor

Administrator
Hero Member

Posts: 7973

Re: UnHavok.cpp

« Reply #1 on: May 04, 2020, 22:30 »

Hi,
That code was used only for Bioshock 1 and 2, for reading skeleton information from Havok. I doubt it's suitable for anything else.
Havok stored data in a single block, which was serialized with a single read operation. However data contains pointers, which can't be stored in the file directly. So, there's "fixup" table which tells where these pointers are located. The code you referenced in your message performs conversion of in-file pointer placeholder to "real" pointers. It's similar to what Win32 PE file format does.


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John76

Newbie

Posts: 3

Re: UnHavok.cpp

« Reply #2 on: May 04, 2020, 22:49 »

Tnx Gildor!

I loaded all sections from model... _class_, _type_, _data_
each separately, though they are all together in your code...

In principle it would mean something like this... I think...for example

DataSection is array of bytes... {1, 2, 33, 4, 55, 6, 7, 8, 9, 10, 10, 114, .....}

For example 33 is (at fromOffset 3) and 114 is (at toOffset 12)
I know this is not Datasection(fromoffset) = DataSection(tooffset)

When i reach 33 i jump to essentially 144?

Or my BinarReader starts from offset 12???

Tnx again!


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Gildor

Administrator
Hero Member

Posts: 7973

Re: UnHavok.cpp

« Reply #3 on: May 04, 2020, 22:53 »

Man, I wrote thin is 2009. It's too old, I don't remember details. However things should be simple if you understand the concept.


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John76

Newbie

Posts: 3

Re: UnHavok.cpp

« Reply #4 on: May 04, 2020, 23:02 »

I agree! Tnx


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