CBitRead::Seek

/* CBitRead::Seek(int) */

undefined1 __thiscall CBitRead::Seek(CBitRead *this,int param_1)

{
  byte bVar1;
  byte *pbVar2;
  ushort uVar3;
  byte *pbVar4;
  uint uVar5;
  uint uVar6;
  uint *puVar7;
  int iVar8;
  int iVar9;
  uint uVar10;
  undefined1 local_11;
  
  if (param_1 < 0) {
    uVar6 = *(uint *)(this + 8);
  }
  else {
    uVar6 = *(uint *)(this + 8);
    local_11 = 1;
    if (param_1 <= (int)uVar6) goto LAB_00b7614c;
  }
  this[4] = (CBitRead)0x1;
  local_11 = 0;
  param_1 = uVar6;
LAB_00b7614c:
  uVar6 = *(uint *)(this + 0xc) & 3;
  if (3 < *(uint *)(this + 0xc)) {
    uVar10 = param_1 + 7;
    if (-1 < param_1) {
      uVar10 = param_1;
    }
    if (((int)uVar6 <= (int)uVar10 >> 3) || (uVar6 == 0)) {
      uVar5 = param_1 + uVar6 * -8;
      uVar10 = uVar5 + 0x1f;
      if (-1 < (int)uVar5) {
        uVar10 = uVar5;
      }
      puVar7 = (uint *)(uVar6 + ((int)uVar10 >> 5) * 4 + *(int *)(this + 0x20));
      *(uint **)(this + 0x18) = puVar7;
      if (*(int *)(this + 0x20) == 0) {
        iVar9 = 1;
        uVar6 = 0;
      }
      else {
        *(undefined4 *)(this + 0x14) = 0x20;
        if (puVar7 == *(uint **)(this + 0x1c)) {
          iVar9 = 1;
          *(uint **)(this + 0x18) = puVar7 + 1;
          uVar6 = 0;
        }
        else if (*(uint **)(this + 0x1c) < puVar7) {
          this[4] = (CBitRead)0x1;
          iVar9 = 0x20;
          uVar6 = 0;
        }
        else {
          *(uint **)(this + 0x18) = puVar7 + 1;
          iVar9 = 0x20;
          uVar6 = *puVar7 >> ((byte)uVar5 & 0x1f);
        }
      }
      *(uint *)(this + 0x10) = uVar6;
      iVar8 = 0x20 - (uVar5 & 0x1f);
      if (iVar9 < iVar8) {
        iVar8 = iVar9;
      }
      *(int *)(this + 0x14) = iVar8;
      return local_11;
    }
  }
  pbVar2 = *(byte **)(this + 0x20);
  if (pbVar2 == (byte *)0x0) {
    uVar10 = *(uint *)(this + 0x10);
    pbVar4 = (byte *)0x0;
  }
  else {
    bVar1 = *pbVar2;
    uVar10 = (uint)bVar1;
    *(uint *)(this + 0x10) = uVar10;
    if (uVar6 < 2) {
      pbVar4 = pbVar2 + 1;
    }
    else {
      uVar3 = CONCAT11(pbVar2[1],bVar1);
      uVar10 = (uint)uVar3;
      *(uint *)(this + 0x10) = uVar10;
      if (uVar6 == 3) {
        pbVar4 = pbVar2 + 3;
        uVar10 = (uint)CONCAT12(pbVar2[2],uVar3);
      }
      else {
        pbVar4 = pbVar2 + 2;
      }
    }
  }
  *(byte **)(this + 0x18) = pbVar4;
  *(uint *)(this + 0x10) = uVar10 >> (sbyte)(param_1 & 0x1fU);
  *(uint *)(this + 0x14) = uVar6 * 8 - (param_1 & 0x1fU);
  return local_11;
}