[MPlayer-dev-eng] silly code

[Arpi]

Hi,

ok, i understand it now.
it's a hashtable handler func. it inserts new element to hashed linked list.
the code bellow calculates a hash value from [esp+4], checks the 0x00001837
long hash table. if that field is zero, then it will be a new list, if it's
non-zero it appends to existing linked list.

maybe this is the codec registration stuff i'm searching for.

(i'll never like gdb's silly reversed asm, compared to tasm's intel syntax)

> i'm still on quicktime.qts...
> it still does sig11 with win32 loader here:
> 
> 0x629a1d80:     mov    0x4(%esp,1),%ecx    ;; ecx = AABBCCDD == 0x0806b738
> 0x629a1d84:     xor    %edx,%edx           ;; edx = 00000000
> 0x629a1d86:     mov    %ecx,%eax           ;; eax = AABBCCDD
> 0x629a1d88:     mov    %cl,%dh             ;; edx = 0000DD00
> 0x629a1d8a:     shr    $0x8,%eax           ;; eax = 00AABBCC
> 0x629a1d8d:     mov    %al,%dl             ;; edx = 0000DDCC
> 0x629a1d8f:     and    $0xff00,%eax        ;; eax = 0000BB00
> 0x629a1d94:     and    $0xff0000,%ecx      ;; ecx = 00BB0000
> 0x629a1d9a:     or     %ecx,%eax           ;; eax = 00BBBB00
> 0x629a1d9c:     shr    $0x8,%eax           ;; eax = 0000BBBB
> 0x629a1d9f:     xor    %edx,%eax           ;; eax = 0000(BBBB^DDCC)
> 
> 0x629a1da1:     xor    %edx,%edx
> 0x629a1da3:     div    0x62b6fa94,%eax     ;; 0x00001837
> 0x629a1da9:     mov    0x62b7d640,%eax     ;; 0x00000000  < problem?
> 0x629a1dae:     mov    (%eax,%edx,4),%eax
> ^^^^^^^^^^ sig11 here.
> 
> 0x629a1db1:     test   %eax,%eax
> 0x629a1db3:     jne    0x629a1dcf
> 
> after ;; there are my comments. i tried to find out what the hell this code
> do, but i don't really understand. it seems to be nonsense to me.
> it get a memory address in stack (maybe it's wrong here), then it starts
> swapping bytes in weird way, finally divide by 0x00001837 and use the modulo
> as index in dword data table, with (another error?) zero base address.
> 
> 
> A'rpi / Astral & ESP-team
> 
> --
> mailto:arpi at thot.banki.hu
> http://esp-team.scene.hu
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> MPlayer-dev-eng at mplayerhq.hu
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> 
> 


A'rpi / Astral & ESP-team

--
mailto:arpi at thot.banki.hu
http://esp-team.scene.hu