Method ReadHeader15

Libraries/unrar/arcread.cpp:137–546

size_t Archive::ReadHeader15()
{
  RawRead Raw(this);

  bool Decrypt=Encrypted && CurBlockPos>(int64)SFXSize+SIZEOF_MARKHEAD3;

  if (Decrypt)
  {
#ifdef RAR_NOCRYPT // For rarext.dll and unrar_nocrypt.dll.
    return 0;
#else
    RequestArcPassword();

    byte Salt[SIZE_SALT30];
    if (Read(Salt,SIZE_SALT30)!=SIZE_SALT30)
    {
      UnexpEndArcMsg();
      return 0;
    }
    HeadersCrypt.SetCryptKeys(false,CRYPT_RAR30,&Cmd->Password,Salt,NULL,0,NULL,NULL);
    Raw.SetCrypt(&HeadersCrypt);
#endif
  }

  Raw.Read(SIZEOF_SHORTBLOCKHEAD);
  if (Raw.Size()==0)
  {
    UnexpEndArcMsg();
    return 0;
  }

  ShortBlock.HeadCRC=Raw.Get2();

  ShortBlock.Reset();

  uint HeaderType=Raw.Get1();
  ShortBlock.Flags=Raw.Get2();
  ShortBlock.SkipIfUnknown=(ShortBlock.Flags & SKIP_IF_UNKNOWN)!=0;
  ShortBlock.HeadSize=Raw.Get2();

  ShortBlock.HeaderType=(HEADER_TYPE)HeaderType;
  if (ShortBlock.HeadSize<SIZEOF_SHORTBLOCKHEAD)
  {
    BrokenHeaderMsg();
    return 0;
  }

  // For simpler further processing we map header types common
  // for RAR 1.5 and 5.0 formats to RAR 5.0 values. It does not include
  // header types specific for RAR 1.5 - 4.x only.
  switch(ShortBlock.HeaderType)
  {
    case HEAD3_MAIN:    ShortBlock.HeaderType=HEAD_MAIN;     break;
    case HEAD3_FILE:    ShortBlock.HeaderType=HEAD_FILE;     break;
    case HEAD3_SERVICE: ShortBlock.HeaderType=HEAD_SERVICE;  break;
    case HEAD3_ENDARC:  ShortBlock.HeaderType=HEAD_ENDARC;   break;
  }
  CurHeaderType=ShortBlock.HeaderType;