signed int __cdecl sub_899A40(int a1, int a2, int a3)
{
  int i; // ebx@1
  int *v4; // esi@1
  int v5; // edx@3
  int v6; // edx@4
  int v7; // edi@6
  int v8; // eax@8
  char *v10; // edx@10
  int v11; // ecx@11
  int v12; // eax@14
  int v13; // esi@14
  unsigned int v14; // edx@14
  unsigned int v15; // ebx@15
  unsigned int v16; // edx@17
  int v17; // ecx@17
  int v18; // eax@17
  int v19; // eax@20
  int *v20; // [sp+Ch] [bp-4h]@14
  int v21; // [sp+1Ch] [bp+Ch]@3
  unsigned int v22; // [sp+20h] [bp+10h]@14

  i = a1;
  v4 = (int *)a2;
  if ( *(_DWORD *)(a2 + 8) != 6 )
    v4 = (int *)((int (__cdecl *)(int, int))loc_899ED0)(a1, a2);
  v5 = *(_DWORD *)(a1 + 28);
  v21 = *v4;
  if ( v5 == *(_DWORD *)(a1 + 36) )
  {
    v6 = ((int (__cdecl *)(int))loc_7A99C0)(a1);
  }
  else
  {
    v6 = v5 + 24;
    *(_DWORD *)(a1 + 28) = v6;
  }
  v7 = a3;
  *(_DWORD *)(v6 + 4) = v4;
  *(_DWORD *)v6 = v4 + 4;
  *(_DWORD *)(v6 + 12) = *(_DWORD *)(a1 + 32) + 16 * *(_BYTE *)(v21 + 8);
  *(_DWORD *)(v6 + 20) = 0;
  *(_DWORD *)(v6 + 16) = a3;
  *(_DWORD *)(a1 + 12) = v4 + 4;
  if ( *(_DWORD *)(a1 + 16) - *(_DWORD *)(a1 + 32) <= 16 * *(_BYTE *)(v21 + 8) )
    sub_7A9A20(a1, *(_BYTE *)(v21 + 8));
  v8 = v21 + 20;
  if ( !*(_BYTE *)(v21 + 6) )
  {
    *(_DWORD *)(*(_DWORD *)(a1 + 28) + 8) = *(_DWORD *)v8 - v8 + 12 - *(_DWORD *)(*(_DWORD *)v8 - v8 + 12);
    return 0;
  }
  v10 = (char *)(v8 ^ *(_DWORD *)v8);
  if ( v10 - 680097491 >= (char *)&off_1241D7C[18] + 3 )
  {
    v11 = 0;
  }
  else
  {
    v11 = ((int (__cdecl *)(int))v10)(a1);
    if ( v11 < 0 )
      return 2;
  }
  v12 = *(_DWORD *)(a1 + 28);
  v13 = *(_DWORD *)(v12 + 4);
  v20 = (int *)(v12 - 24);
  v14 = *(_DWORD *)(a1 + 32);
  v22 = *(_DWORD *)(a1 + 32);
  if ( v7 )
  {
    v15 = *(_DWORD *)(a1 + 32) - 16 * v11;
    do
    {
      if ( v15 >= v14 )
        break;
      v16 = v15;
      v17 = v13;
      v15 += 16;
      v13 += 16;
      *(_DWORD *)v17 = *(_DWORD *)v16;
      *(_DWORD *)(v17 + 4) = *(_DWORD *)(v16 + 4);
      v18 = *(_DWORD *)(v16 + 8);
      v14 = v22;
      *(_DWORD *)(v17 + 8) = v18;
      --v7;
    }
    while ( v7 );
    for ( i = a1; v7 > 0; v13 += 16 )
    {
      --v7;
      *(_DWORD *)(v13 + 8) = 0;
    }
  }
  *(_DWORD *)(i + 28) = v20;
  v19 = *v20;
  *(_DWORD *)(i + 32) = v13;
  *(_DWORD *)(i + 12) = v19;
  return 1;
}