// 1
BOOL __userpurge dataXFer_0x04@<eax>(unsigned int a1@<eax>, int arg0, int a2)
{
  BOOL result; // eax
  int v4; // ebx
  int v5; // eax
  unsigned int v6; // ecx
  int v7; // ecx
  int v8; // [esp-Ch] [ebp-Ch]

  if ( a1 < 9 )
    return 0;
  if ( a1 != *(unsigned __int16 *)(arg0 + 7) + 9 )
    return 0;
  v4 = sub_45A010(*(_BYTE *)(arg0 + 2), *(_BYTE *)(arg0 + 1));
  if ( !v4 )
    return 0;
  v5 = *(_DWORD *)(arg0 + 3);
  v6 = *(_DWORD *)(v4 + 12);
  if ( v5 == v6 || v5 + (unsigned int)*(unsigned __int16 *)(arg0 + 7) > v6 )
  {
    v8 = a2;
    goto LABEL_18;
  }
  if ( v5 != *(_DWORD *)(v4 + 64) )
  {
    v6 = a2;
    v8 = a2;
LABEL_18:
    sub_459D90(v4, v6, v8);
    dataXFer_0x06(v4);
    return 0;
  }
  *(_BYTE *)(v4 + 52) |= 4u;
  *(_BYTE *)(v4 + 61) = a2;
  qmemcpy(
    (void *)(*(_DWORD *)(arg0 + 3) + *(_DWORD *)(v4 + 68)),
    (const void *)(arg0 + 9),
    *(unsigned __int16 *)(arg0 + 7));
  *(_DWORD *)(v4 + 64) += *(unsigned __int16 *)(arg0 + 7);
  sub_459DC0(v4);
  if ( *(_DWORD *)(v4 + 64) != *(_DWORD *)(v4 + 12) )
    return 1;
  if ( CRC32(v7, *(_DWORD *)(v4 + 68), *(_DWORD *)(v4 + 12)) != *(_DWORD *)(v4 + 16) )
  {
    *(_DWORD *)(v4 + 64) = 0;
LABEL_12:
    *(_BYTE *)(v4 + 52) &= 0xFBu;
    dataXFer_0x06(v4);
    return 1;
  }
  result = openMapFile(v4);
  if ( result )
    goto LABEL_12;
  *(_BYTE *)(v4 + 52) = 8;
  return result;
}