Pasted

uint __thiscall CFile::DecryptFile(CFile *this,int buffer,undefined4 length)
{
  uint data;
  uint character;
  int x;
  int y;
  
  CheckFileHeader((cFile *)this);
  data = Read((CFile *)this,buffer,length);
  if ((this[0x20] != (CFile)0x0) && (character = 0, data != 0)) {
    do {
      y = *(int *)(this + 0x1c);
      x = *(int *)(this + 0x18);
      *(byte *)(character + buffer) =
           *(byte *)(character + buffer) ^ "theocracy sux"[x] ^ "mutant technology"[y];
      *(uint *)(this + 0x18) = (x + 1U) % 0xd;
      character = character + 1;
      *(uint *)(this + 0x1c) = (y + 1U) % 0x11;
    } while (character < data);
  }
  Close(this);
  return data;
}
 
undefined4 __fastcall CFile::CheckFileHeader(cFile *path)
{
  undefined4 file;
  uint index;
  int address;
  char file_header [8];
  char error_message [1024];
  
  file = OpenR(path);
  if ((char)file == '\0') {
    return file;
  }
  Read((CFile *)path,file_header,7);
  index = 0;
  do {
    if (file_header[index] != "RSA4096"[index]) {
      path[0x20] = (cFile)0x0;
      sprintf(error_message,s_Unknown_textfile_format!_%s_005e01d0,*(undefined4 *)(path + 0x14));
      die(error_message);
      file = SeekB((CFile *)path,0);
      return CONCAT31((int3)((uint)file >> 8),1);
    }
    index = index + 1;
  } while (index < 7);
  path[0x20] = (cFile)0x1;
  address = SeekIgnoreHeader((CFile *)path,0); //Always uses 0 for "index"
  return CONCAT31((int3)((uint)address >> 8),1);
}
 
int __thiscall CFile::SeekIgnoreHeader(CFile *this,uint start)
{
  int index;
  
  if (this[0x20] != (CFile)0x0) {
    index = SeekB((CFile *)this,start + 7);
    *(uint *)(this + 0x18) = start % 0xd;
    *(uint *)(this + 0x1c) = start % 0x11;
    return index + -7;
  }
  index = SeekB((CFile *)this,start);
  return index;
}
 
void __thiscall CFile::SeekB(CFile *this,undefined4 param_1)
{
  bool bVar1;
  
  bVar1 = isOpen(this);
  if (!bVar1) {
    die(s_cFile::SeekB_file_is_not_open_005e0130);
  }
  (**(code **)(**(int **)(this + 0xc) + 0x10))(param_1,0);
  return;
}
 
void __thiscall CFile::Read(CFile *this,undefined4 buffer,undefined4 length)
{
  int iVar1;
  bool isOpen;
  undefined4 uStack_10;
  
  isOpen = CFile::isOpen(this);
  if (!isOpen) {
    uStack_10 = 0x54a567;
    die(s_cFile::Read_file_is_not_open_005e0190);
  }
  iVar1 = **(int **)(this + 0xc);
  uStack_10 = length;
  FUN_005674e0(&uStack_10,buffer);
  (**(code **)(iVar1 + 0x14))();
  return;
}
 
void __thiscall FUN_005674e0(void *this,undefined4 param_1)
{
  *(undefined4 *)this = param_1;
  return;
}