old_bf_read::ReadBits

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

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

{
  uint uVar1;
  uint uVar2;
  int iVar3;
  uint uVar4;
  uint *puVar5;
  int iVar6;
  byte bVar7;
  uint *puVar8;
  uint *local_1c;
  uint *local_18;
  
  for (local_1c = param_1; ((uint)local_1c & 3) != 0; local_1c = (uint *)((int)local_1c + 1)) {
    if (param_2 < 8) goto LAB_00242fc9;
    iVar3 = *(int *)(this + 0xc);
    uVar2 = iVar3 + 8;
    if (*(int *)(this + 8) < (int)uVar2) {
      *(int *)(this + 0xc) = *(int *)(this + 8);
      local_18._0_1_ = 0;
      this[0x10] = (old_bf_read)0x1;
    }
    else {
      iVar6 = iVar3 >> 5;
      uVar1 = *(uint *)(*(int *)this + iVar6 * 4);
      *(uint *)(this + 0xc) = uVar2;
      local_18._0_1_ = (byte)(uVar1 >> ((byte)iVar3 & 0x1f));
      if (iVar6 == iVar3 + 7 >> 5) {
        local_18._0_1_ = (byte)local_18 & (byte)DAT_003f2d40;
      }
      else {
        local_18._0_1_ =
             (byte)((*(uint *)(*(int *)this + 4 + iVar6 * 4) & (&g_ExtraMasks)[uVar2 & 0x1f]) <<
                   (8U - (char)(uVar2 & 0x1f) & 0x1f)) | (byte)local_18;
      }
    }
    param_2 = param_2 + -8;
    *(byte *)local_1c = (byte)local_18;
  }
  if (0x1f < param_2) {
    uVar2 = param_2 - 0x20U >> 5;
    puVar5 = local_1c + uVar2 + 1;
    do {
      while( true ) {
        uVar1 = *(uint *)(this + 0xc);
        if ((int)(uVar1 + 0x20) <= *(int *)(this + 8)) break;
        *(int *)(this + 0xc) = *(int *)(this + 8);
        puVar8 = local_1c + 1;
        this[0x10] = (old_bf_read)0x1;
        *local_1c = 0;
        local_1c = puVar8;
        if (puVar8 == puVar5) goto LAB_00242fbb;
      }
      iVar3 = (int)uVar1 >> 5;
      uVar4 = *(uint *)(*(int *)this + iVar3 * 4);
      *(uint *)(this + 0xc) = uVar1 + 0x20;
      local_18._0_1_ = (byte)(uVar1 & 0x1f);
      uVar4 = uVar4 >> (byte)local_18;
      if (iVar3 != (int)(uVar1 + 0x1f) >> 5) {
        uVar4 = uVar4 | (*(uint *)(*(int *)this + 4 + iVar3 * 4) & (&g_ExtraMasks)[uVar1 & 0x1f]) <<
                        (0x20 - (byte)local_18 & 0x1f);
      }
      *local_1c = uVar4;
      local_1c = local_1c + 1;
    } while (local_1c != puVar5);
LAB_00242fbb:
    param_2 = (param_2 - 0x20U) + uVar2 * -0x20;
    local_1c = puVar5;
  }
LAB_00242fc9:
  if (param_2 < 8) {
    local_18 = local_1c;
  }
  else {
    uVar2 = param_2 - 8U >> 3;
    local_18 = (uint *)((int)local_1c + uVar2 + 1);
    do {
      while( true ) {
        iVar3 = *(int *)(this + 0xc);
        uVar1 = iVar3 + 8;
        if ((int)uVar1 <= *(int *)(this + 8)) break;
        *(int *)(this + 0xc) = *(int *)(this + 8);
        puVar5 = (uint *)((int)local_1c + 1);
        this[0x10] = (old_bf_read)0x1;
        *(undefined1 *)local_1c = 0;
        local_1c = puVar5;
        if (puVar5 == local_18) goto LAB_00243069;
      }
      iVar6 = iVar3 >> 5;
      uVar4 = *(uint *)(*(int *)this + iVar6 * 4);
      *(uint *)(this + 0xc) = uVar1;
      bVar7 = (byte)(uVar4 >> ((byte)iVar3 & 0x1f));
      if (iVar6 == iVar3 + 7 >> 5) {
        bVar7 = bVar7 & (byte)DAT_003f2d40;
      }
      else {
        bVar7 = (byte)((*(uint *)(*(int *)this + 4 + iVar6 * 4) & (&g_ExtraMasks)[uVar1 & 0x1f]) <<
                      (8U - (char)(uVar1 & 0x1f) & 0x1f)) | bVar7;
      }
      *(byte *)local_1c = bVar7;
      local_1c = (uint *)((int)local_1c + 1);
    } while (local_1c != local_18);
LAB_00243069:
    param_2 = (param_2 - 8U) + uVar2 * -8;
  }
  if (param_2 == 0) {
    return;
  }
  iVar3 = *(int *)(this + 0xc);
  uVar2 = param_2 + iVar3;
  if (*(int *)(this + 8) < (int)uVar2) {
    *(int *)(this + 0xc) = *(int *)(this + 8);
    bVar7 = 0;
    this[0x10] = (old_bf_read)0x1;
  }
  else {
    iVar6 = iVar3 >> 5;
    uVar1 = *(uint *)(*(int *)this + iVar6 * 4);
    *(uint *)(this + 0xc) = uVar2;
    bVar7 = (byte)(uVar1 >> ((byte)iVar3 & 0x1f));
    if (iVar6 == (int)(uVar2 - 1) >> 5) {
      bVar7 = bVar7 & *(byte *)(&g_ExtraMasks + param_2);
    }
    else {
      bVar7 = bVar7 | (byte)(((&g_ExtraMasks)[uVar2 & 0x1f] &
                             *(uint *)(*(int *)this + 4 + iVar6 * 4)) <<
                            ((char)param_2 - (char)(uVar2 & 0x1f) & 0x1fU));
    }
  }
  *(byte *)local_18 = bVar7;
  return;
}