Method Init

Libraries/unrar/unpack50frag.cpp:25–63

void FragmentedWindow::Init(size_t WinSize)
{
  Reset();

  uint BlockNum=0;
  size_t TotalSize=0; // Already allocated.
  while (TotalSize<WinSize && BlockNum<ASIZE(Mem))
  {
    size_t Size=WinSize-TotalSize; // Size needed to allocate.

    // Minimum still acceptable block size. Next allocations cannot be larger
    // than current, so we do not need blocks if they are smaller than
    // "size left / attempts left". Also we do not waste time to blocks
    // smaller than some arbitrary constant.
    size_t MinSize=Max(Size/(ASIZE(Mem)-BlockNum), 0x400000);

    byte *NewMem=NULL;
    while (Size>=MinSize)
    {
      NewMem=(byte *)malloc(Size);
      if (NewMem!=NULL)
        break;
      Size-=Size/32;
    }
    if (NewMem==NULL)
      throw std::bad_alloc();

    // Clean the window to generate the same output when unpacking corrupt
    // RAR files, which may access to unused areas of sliding dictionary.
    memset(NewMem,0,Size);

    Mem[BlockNum]=NewMem;
    TotalSize+=Size;
    MemSize[BlockNum]=TotalSize;
    BlockNum++;
  }
  if (TotalSize<WinSize) // Not found enough free blocks.
    throw std::bad_alloc();
}


byte& FragmentedWindow::operator [](size_t Item)