/* WARNING: Type propagation algorithm not settling */

ushort * FUN_0047ce1c(uint param_1,ushort *param_2,ushort *param_3,undefined4 *param_4)

{

  byte bVar1;

  ushort uVar2;

  undefined4 *puVar3;

  uint uVar4;

  ushort *puVar5;

  byte *in_t0;

  uint uVar6;

  ushort *puVar7;

  uVar4 = param_1 & 0xff;

  if (uVar4 == 0x50) {

    puVar3 = (undefined4 *)((uint)((int)param_3 + 3) & 0xfffffffc);

    in_t0 = (byte *)*puVar3;

    puVar5 = (ushort *)(puVar3 + 1);

    goto LAB_0047cfa4;

  }

  puVar5 = param_3;

  switch(param_1 & 0xf) {

  case 0:

  case 3:

  case 0xb:

    in_t0 = *(byte **)param_3;

    puVar5 = param_3 + 2;

    break;

  case 1:

    in_t0 = (byte *)0x0;

    uVar6 = 0;

    do {

      uVar2 = *puVar5;

      puVar5 = (ushort *)((int)puVar5 + 1);

      in_t0 = (byte *)((uint)in_t0 | ((byte)uVar2 & 0x7f) << (uVar6 & 0x1f));

      uVar6 = uVar6 + 7;

    } while ((char)(byte)uVar2 < '\0');

    break;

  case 2:

    in_t0 = (byte *)(uint)*param_3;

    goto LAB_0047cf3c;

  case 4:

  case 0xc:

    in_t0 = *(byte **)param_3;

    puVar5 = param_3 + 4;

    break;

  default:

    puVar7 = param_3;

    FUN_00485c50();

    puVar5 = param_3;

    param_3 = puVar7;

    break;

  case 9:

    in_t0 = (byte *)0x0;

    uVar6 = 0;

    do {

      bVar1 = (byte)*puVar5;

      puVar5 = (ushort *)((int)puVar5 + 1);

      in_t0 = (byte *)((uint)in_t0 | (bVar1 & 0x7f) << (uVar6 & 0x1f));

      uVar6 = uVar6 + 7;

    } while ((char)bVar1 < '\0');

    if ((uVar6 < 0x20) && ((bVar1 & 0x40) != 0)) {

      in_t0 = (byte *)(-1 << (uVar6 & 0x1f) | (uint)in_t0);

    }

    break;

  case 10:

    in_t0 = (byte *)(int)(short)*param_3;

LAB_0047cf3c:

    puVar5 = param_3 + 1;

  }

  if (in_t0 != (byte *)0x0) {

    if ((uVar4 & 0x70) == 0x10) {

      param_2 = param_3;

    }

    in_t0 = in_t0 + (int)param_2;

    if ((char)uVar4 < '\0') {

      in_t0 = *(byte **)in_t0;

    }

  }

LAB_0047cfa4:

  *param_4 = in_t0;

  return puVar5;

}