NTSTATUS __fastcall NormBuffer__RewindOutputCharacter(INT64 a1){
_WORD *v1;
NTSTATUS result;
*(_QWORD *)(a1 + 40) -= 2i64;
v1 = *(_WORD **)(a1 + 40);
if( (unsigned __int16)(*v1 + 9215) <= 0x3FDu )
*(_QWORD *)(a1 + 40) = v1 - 1;
*(_QWORD *)(a1 + 64) = *(_QWORD *)(a1 + 24) - 2i64;
result = 0;
*(_DWORD *)(a1 + 56) = 0;
*(_WORD *)(a1 + 72) = 0;
return result;
}