void FUN_00402fec(void *param_1,int param_2,uint param_3,uint param_4)

{

  uint uVar1;

  uint uVar2;

  uint *puVar3;

  uint uVar4;

  int iVar5;

  int iVar6;

  uint *puVar7;

  uint *puVar8;

  int iVar9;

  uint uVar10;

  uint uVar11;

  uVar10 = param_4 & 0x8000001f;

  uVar4 = param_4 + 0x1f >> 5;

  if ((int)uVar10 < 0) {

    uVar10 = (uVar10 - 1 | 0xffffffe0) + 1;

  }

  uVar11 = param_3;

  if ((int)param_3 < 0) {

    uVar11 = param_3 + 0x1f;

  }

  uVar11 = (int)uVar11 >> 5;

  iVar6 = ~uVar11 + uVar4;

  if (-1 < iVar6) {

    param_3 = param_3 & 0x8000001f;

    if ((int)param_3 < 0) {

      param_3 = (param_3 - 1 | 0xffffffe0) + 1;

    }

    iVar9 = iVar6 + uVar11;

    puVar8 = (uint *)(param_2 + (iVar6 + -1) * 4);

    puVar3 = (uint *)(param_2 + iVar6 * 4);

    uVar1 = (1 << (uVar10 & 0x1f)) - 1;

    puVar7 = (uint *)((int)param_1 + iVar9 * 4);

    iVar5 = uVar4 - 1;

    do {

      if ((param_3 == 0) || (iVar6 == 0)) {

        uVar4 = *puVar3;

        uVar2 = 0;

        if (uVar10 == 0) goto LAB_004030f0;

LAB_004030a4:

        if (iVar5 == iVar6) {

          uVar4 = uVar4 & uVar1;

        }

        uVar2 = uVar4 << (param_3 & 0x1f) | uVar2;

        *puVar7 = uVar2;

        if (iVar5 == iVar9) {

          *puVar7 = uVar1 & uVar2;

        }

      }

      else {

        uVar2 = *puVar8 >> (0x20 - param_3 & 0x1f);

        uVar4 = *puVar3;

        if (uVar10 != 0) goto LAB_004030a4;

LAB_004030f0:

        *puVar7 = uVar2 | uVar4 << (param_3 & 0x1f);

      }

      iVar6 = iVar6 + -1;

      puVar7 = puVar7 + -1;

      iVar9 = iVar9 + -1;

      puVar3 = puVar3 + -1;

      puVar8 = puVar8 + -1;

    } while (-1 < iVar6);

  }

  if (uVar11 == 0) {

    return;

  }

  memset(param_1,0,uVar11 << 2);

  return;

}