CBitRead::ReadBits

/* CBitRead::ReadBits(void*, int) */

void __thiscall CBitRead::ReadBits(CBitRead *this,void *param_1,int param_2)

{
  uint *puVar1;
  int iVar2;
  uint *puVar3;
  undefined4 uVar4;
  uint uVar5;
  undefined4 *puVar6;
  uint uVar7;
  byte bVar8;
  uint uVar9;
  int iVar10;
  byte local_1c;
  byte local_18;
  byte local_14;
  
  for (; ((uint)param_1 & 3) != 0; param_1 = (void *)((int)param_1 + 1)) {
    if (param_2 < 8) goto LAB_00257ecb;
    iVar2 = *(int *)(this + 0x14);
    bVar8 = (byte)*(uint *)(this + 0x10);
    if (iVar2 < 8) {
      puVar1 = *(uint **)(this + 0x18);
      if (puVar1 == *(uint **)(this + 0x1c)) {
        *(undefined4 *)(this + 0x14) = 1;
        *(uint **)(this + 0x18) = puVar1 + 1;
        bVar8 = 0;
        *(undefined4 *)(this + 0x10) = 0;
        this[4] = (CBitRead)0x1;
      }
      else {
        if (*(uint **)(this + 0x1c) < puVar1) {
          this[4] = (CBitRead)0x1;
          *(undefined4 *)(this + 0x10) = 0;
        }
        else {
          *(uint **)(this + 0x18) = puVar1 + 1;
          uVar9 = *puVar1;
          *(uint *)(this + 0x10) = uVar9;
          if (this[4] == (CBitRead)0x0) {
            uVar7 = (&CBitBuffer::s_nMaskTable)[8 - iVar2];
            *(int *)(this + 0x14) = iVar2 + 0x18;
            local_18 = (byte)(8 - iVar2);
            bVar8 = (byte)((uVar7 & uVar9) << ((byte)iVar2 & 0x1f)) | bVar8;
            *(uint *)(this + 0x10) = uVar9 >> (local_18 & 0x1f);
            goto LAB_00257d33;
          }
        }
        bVar8 = 0;
      }
    }
    else {
      *(int *)(this + 0x14) = iVar2 + -8;
      if (iVar2 + -8 == 0) {
        puVar6 = *(undefined4 **)(this + 0x18);
        *(undefined4 *)(this + 0x14) = 0x20;
        if (puVar6 == *(undefined4 **)(this + 0x1c)) {
          *(undefined4 *)(this + 0x14) = 1;
          *(undefined4 *)(this + 0x10) = 0;
          *(undefined4 **)(this + 0x18) = puVar6 + 1;
        }
        else if (*(undefined4 **)(this + 0x1c) < puVar6) {
          this[4] = (CBitRead)0x1;
          *(undefined4 *)(this + 0x10) = 0;
        }
        else {
          *(undefined4 **)(this + 0x18) = puVar6 + 1;
          *(undefined4 *)(this + 0x10) = *puVar6;
        }
      }
      else {
        *(uint *)(this + 0x10) = *(uint *)(this + 0x10) >> 8;
      }
    }
LAB_00257d33:
    param_2 = param_2 + -8;
    *(byte *)param_1 = bVar8;
  }
  if (0x1f < param_2) {
    uVar9 = param_2 - 0x20U >> 5;
    puVar1 = (uint *)((int)param_1 + (uVar9 + 1) * 4);
    do {
      while (iVar2 = *(int *)(this + 0x14), 0x1f < iVar2) {
        uVar7 = *(uint *)(this + 0x10);
        *(int *)(this + 0x14) = iVar2 + -0x20;
        if (iVar2 + -0x20 == 0) {
          puVar6 = *(undefined4 **)(this + 0x18);
          *(undefined4 *)(this + 0x14) = 0x20;
          if (puVar6 == *(undefined4 **)(this + 0x1c)) {
            *(undefined4 *)(this + 0x14) = 1;
            *(undefined4 *)(this + 0x10) = 0;
            *(undefined4 **)(this + 0x18) = puVar6 + 1;
          }
          else {
            if (*(undefined4 **)(this + 0x1c) < puVar6) {
              this[4] = (CBitRead)0x1;
              goto LAB_00257e72;
            }
            *(undefined4 **)(this + 0x18) = puVar6 + 1;
            *(undefined4 *)(this + 0x10) = *puVar6;
          }
        }
        else {
LAB_00257e72:
          *(undefined4 *)(this + 0x10) = 0;
        }
LAB_00257e79:
        *(uint *)param_1 = uVar7;
        param_1 = (void *)((int)param_1 + 4);
        if (param_1 == puVar1) goto LAB_00257eba;
      }
      puVar3 = *(uint **)(this + 0x18);
      uVar7 = *(uint *)(this + 0x10);
      if (puVar3 == *(uint **)(this + 0x1c)) {
        *(undefined4 *)(this + 0x14) = 1;
        *(uint **)(this + 0x18) = puVar3 + 1;
        *(undefined4 *)(this + 0x10) = 0;
        this[4] = (CBitRead)0x1;
      }
      else if (*(uint **)(this + 0x1c) < puVar3) {
        this[4] = (CBitRead)0x1;
        *(undefined4 *)(this + 0x10) = 0;
      }
      else {
        *(uint **)(this + 0x18) = puVar3 + 1;
        uVar5 = *puVar3;
        *(uint *)(this + 0x10) = uVar5;
        if (this[4] == (CBitRead)0x0) {
          *(int *)(this + 0x14) = iVar2;
          local_1c = (byte)(0x20 - iVar2);
          uVar7 = ((&CBitBuffer::s_nMaskTable)[0x20 - iVar2] & uVar5) << ((byte)iVar2 & 0x1f) |
                  uVar7;
          *(uint *)(this + 0x10) = uVar5 >> (local_1c & 0x1f);
          goto LAB_00257e79;
        }
      }
      *(uint *)param_1 = 0;
      param_1 = (void *)((int)param_1 + 4);
    } while (param_1 != puVar1);
LAB_00257eba:
    param_2 = (param_2 - 0x20U) + uVar9 * -0x20;
    param_1 = puVar1;
  }
LAB_00257ecb:
  if (7 < param_2) {
    uVar9 = param_2 - 8U >> 3;
    puVar1 = (uint *)((int)param_1 + uVar9 + 1);
    do {
      while( true ) {
        iVar2 = *(int *)(this + 0x14);
        bVar8 = (byte)*(uint *)(this + 0x10);
        if (7 < iVar2) break;
        puVar3 = *(uint **)(this + 0x18);
        if (puVar3 == *(uint **)(this + 0x1c)) {
          *(undefined4 *)(this + 0x14) = 1;
          *(uint **)(this + 0x18) = puVar3 + 1;
          *(undefined4 *)(this + 0x10) = 0;
          this[4] = (CBitRead)0x1;
        }
        else if (*(uint **)(this + 0x1c) < puVar3) {
          this[4] = (CBitRead)0x1;
          *(undefined4 *)(this + 0x10) = 0;
        }
        else {
          *(uint **)(this + 0x18) = puVar3 + 1;
          uVar7 = *puVar3;
          *(uint *)(this + 0x10) = uVar7;
          if (this[4] == (CBitRead)0x0) {
            uVar5 = (&CBitBuffer::s_nMaskTable)[8 - iVar2];
            *(int *)(this + 0x14) = iVar2 + 0x18;
            local_1c = (byte)(8 - iVar2);
            bVar8 = (byte)((uVar5 & uVar7) << ((byte)iVar2 & 0x1f)) | bVar8;
            *(uint *)(this + 0x10) = uVar7 >> (local_1c & 0x1f);
            goto LAB_00257f07;
          }
        }
        *(byte *)param_1 = 0;
        param_1 = (void *)((int)param_1 + 1);
        if (param_1 == puVar1) goto LAB_00257f48;
      }
      *(int *)(this + 0x14) = iVar2 + -8;
      if (iVar2 + -8 == 0) {
        puVar6 = *(undefined4 **)(this + 0x18);
        *(undefined4 *)(this + 0x14) = 0x20;
        if (puVar6 == *(undefined4 **)(this + 0x1c)) {
          *(undefined4 *)(this + 0x14) = 1;
          *(undefined4 *)(this + 0x10) = 0;
          *(undefined4 **)(this + 0x18) = puVar6 + 1;
        }
        else if (*(undefined4 **)(this + 0x1c) < puVar6) {
          this[4] = (CBitRead)0x1;
          *(undefined4 *)(this + 0x10) = 0;
        }
        else {
          *(undefined4 **)(this + 0x18) = puVar6 + 1;
          *(undefined4 *)(this + 0x10) = *puVar6;
        }
      }
      else {
        *(uint *)(this + 0x10) = *(uint *)(this + 0x10) >> 8;
      }
LAB_00257f07:
      *(byte *)param_1 = bVar8;
      param_1 = (void *)((int)param_1 + 1);
    } while (param_1 != puVar1);
LAB_00257f48:
    param_2 = (param_2 - 8U) + uVar9 * -8;
    param_1 = puVar1;
  }
  if (param_2 != 0) {
    iVar2 = *(int *)(this + 0x14);
    if (iVar2 < param_2) {
      puVar1 = *(uint **)(this + 0x18);
      uVar4 = *(undefined4 *)(this + 0x10);
      if (puVar1 == *(uint **)(this + 0x1c)) {
        *(undefined4 *)(this + 0x14) = 1;
        *(undefined4 *)(this + 0x10) = 0;
        *(uint **)(this + 0x18) = puVar1 + 1;
        this[4] = (CBitRead)0x1;
      }
      else if (puVar1 < *(uint **)(this + 0x1c)) {
        *(uint **)(this + 0x18) = puVar1 + 1;
        uVar9 = *puVar1;
        *(uint *)(this + 0x10) = uVar9;
        if (this[4] == (CBitRead)0x0) {
          iVar10 = param_2 - iVar2;
          uVar7 = (&CBitBuffer::s_nMaskTable)[iVar10];
          *(int *)(this + 0x14) = 0x20 - iVar10;
          *(uint *)(this + 0x10) = uVar9 >> ((byte)iVar10 & 0x1f);
          local_14 = (byte)uVar4;
          *(byte *)param_1 = local_14 | (byte)((uVar7 & uVar9) << ((byte)iVar2 & 0x1f));
          return;
        }
      }
      else {
        this[4] = (CBitRead)0x1;
        *(undefined4 *)(this + 0x10) = 0;
      }
      *(byte *)param_1 = 0;
    }
    else {
      uVar4 = (&CBitBuffer::s_nMaskTable)[param_2];
      *(int *)(this + 0x14) = iVar2 - param_2;
      bVar8 = (byte)uVar4 & (byte)*(uint *)(this + 0x10);
      if (iVar2 - param_2 == 0) {
        puVar6 = *(undefined4 **)(this + 0x18);
        *(undefined4 *)(this + 0x14) = 0x20;
        if (puVar6 == *(undefined4 **)(this + 0x1c)) {
          *(undefined4 *)(this + 0x14) = 1;
          *(undefined4 *)(this + 0x10) = 0;
          *(undefined4 **)(this + 0x18) = puVar6 + 1;
          *(byte *)param_1 = bVar8;
        }
        else if (*(undefined4 **)(this + 0x1c) < puVar6) {
          this[4] = (CBitRead)0x1;
          *(undefined4 *)(this + 0x10) = 0;
          *(byte *)param_1 = bVar8;
        }
        else {
          *(undefined4 **)(this + 0x18) = puVar6 + 1;
          *(undefined4 *)(this + 0x10) = *puVar6;
          *(byte *)param_1 = bVar8;
        }
      }
      else {
        *(uint *)(this + 0x10) = *(uint *)(this + 0x10) >> ((byte)param_2 & 0x1f);
        *(byte *)param_1 = bVar8;
      }
    }
  }
  return;
}