Method ReadSubData

Libraries/unrar/arcread.cpp:1419–1485

bool Archive::ReadSubData(Array<byte> *UnpData,File *DestFile,bool TestMode)
{
  if (BrokenHeader)
  {
    uiMsg(UIERROR_SUBHEADERBROKEN,FileName);
    ErrHandler.SetErrorCode(RARX_CRC);
    return false;
  }
  if (SubHead.Method>5 || SubHead.UnpVer>(Format==RARFMT50 ? VER_UNPACK5:VER_UNPACK))
  {
    uiMsg(UIERROR_SUBHEADERUNKNOWN,FileName);
    return false;
  }

  if (SubHead.PackSize==0 && !SubHead.SplitAfter)
    return true;

  SubDataIO.Init();
  Unpack Unpack(&SubDataIO);
  Unpack.Init(SubHead.WinSize,false);

  if (DestFile==NULL)
  {
    if (SubHead.UnpSize>0x1000000)
    {
      // So huge allocation must never happen in valid archives.
      uiMsg(UIERROR_SUBHEADERUNKNOWN,FileName);
      return false;
    }
    if (UnpData==NULL)
      SubDataIO.SetTestMode(true);
    else
    {
      UnpData->Alloc((size_t)SubHead.UnpSize);
      SubDataIO.SetUnpackToMemory(&(*UnpData)[0],(uint)SubHead.UnpSize);
    }
  }
  if (SubHead.Encrypted)
    if (Cmd->Password.IsSet())
      SubDataIO.SetEncryption(false,SubHead.CryptMethod,&Cmd->Password,
                SubHead.SaltSet ? SubHead.Salt:NULL,SubHead.InitV,
                SubHead.Lg2Count,SubHead.HashKey,SubHead.PswCheck);
    else
      return false;
  SubDataIO.UnpHash.Init(SubHead.FileHash.Type,1);
  SubDataIO.SetPackedSizeToRead(SubHead.PackSize);
  SubDataIO.EnableShowProgress(false);
  SubDataIO.SetFiles(this,DestFile);
  SubDataIO.SetTestMode(TestMode);
  SubDataIO.UnpVolume=SubHead.SplitAfter;
  SubDataIO.SetSubHeader(&SubHead,NULL);
  Unpack.SetDestSize(SubHead.UnpSize);
  if (SubHead.Method==0)
    CmdExtract::UnstoreFile(SubDataIO,SubHead.UnpSize);
  else
    Unpack.DoUnpack(SubHead.UnpVer,false);

  if (!SubDataIO.UnpHash.Cmp(&SubHead.FileHash,SubHead.UseHashKey ? SubHead.HashKey:NULL))