Parsing Entities

[DrGonzo]

To parse the list of entities (Using IDA, with GameClient 1.20130416a.21):

Find the string "gpMainEntityList[iMyIndex]) == ((void *)0". Jump to the reference in code and you'll find this (scrolling up a couple of lines):

.text:006E16A9                 cmp     dword_26320E0[edi*4], 0  //gpMainEntityList
.text:006E16B1                 jz      short loc_6E16D3
.text:006E16B3                 push    177h            ; Value
.text:006E16B8                 push    offset asc_1C4F6D4 ; "c:\\src\\CrossRoads\\Common\\Entity\\EntityS"...
.text:006E16BD                 push    0               ; char
.text:006E16BF                 push    0               ; int
.text:006E16C1                 push    offset aGpmainentityli ; "(gpMainEntityList[iMyIndex]) == ((void "...   //string reference

So gpMainEntityList = dword_26320E0 (not rebased). This is an array of pointers to entities. You can iterate by checking each and ignoring null pointers. This array has a max index of 10240.

[pEntity+0x1b0] seems to point to a movement struct.
[[pEntity+0x1b0]+0x16c] = x
[[pEntity+0x1b0]+0x170] = y
[[pEntity+0x1b0]+0x174] = z

[DrGonzo]

The game is written in C which makes it easy to reverse. Entity class functions (equivalent) are laid out logically. You can find them by searching for string references such as:

EntTimeSinceDamagedInDirection
EntIsVisible
EntIsMyTargetInLoS
EntIsAlive
EntGetVelocity
EntGetAggro
EntGetIsFriend
EntGetIsFoe
EntGetIsFactionFoe
EntGetDistanceFromPointAsString
EntGetDistanceFromPoint

Pick a function like "EntIsVisible", go to the string in IDA then jump to the reference to that string. You'll get something like this (scroll up a couple lines):

.data:02235354                 dd offset sub_987160
.data:02235358                 db    0
.data:02235359                 db    0
.data:0223535A                 db    0
.data:0223535B                 db    0
.data:0223535C                 dd offset aEntisvisible ; "EntIsVisible"

The function address is referenced a couple of lines before the function name.

[DrGonzo]

Reserving for more info.