/// <summary>
/// Opens an Archive for random access
/// </summary>
/// <param name="stream"></param>
/// <param name="readerOptions"></param>
/// <returns></returns>
public static IArchive Open(Stream stream, ReaderOptions?readerOptions = null)
{
stream.CheckNotNull(nameof(stream));
if (!stream.CanRead || !stream.CanSeek)
{
throw new ArgumentException("Stream should be readable and seekable");
}
readerOptions ??= new ReaderOptions();
if (ZipArchive.IsZipFile(stream, null))
{
stream.Seek(0, SeekOrigin.Begin);
return(ZipArchive.Open(stream, readerOptions));
}
stream.Seek(0, SeekOrigin.Begin);
if (SevenZipArchive.IsSevenZipFile(stream))
{
stream.Seek(0, SeekOrigin.Begin);
return(SevenZipArchive.Open(stream, readerOptions));
}
stream.Seek(0, SeekOrigin.Begin);
if (GZipArchive.IsGZipFile(stream))
{
stream.Seek(0, SeekOrigin.Begin);
return(GZipArchive.Open(stream, readerOptions));
}
stream.Seek(0, SeekOrigin.Begin);
if (DmgArchive.IsDmgFile(stream))
{
stream.Seek(0, SeekOrigin.Begin);
return(DmgArchive.Open(stream, readerOptions));
}
stream.Seek(0, SeekOrigin.Begin);
if (RarArchive.IsRarFile(stream, readerOptions))
{
stream.Seek(0, SeekOrigin.Begin);
return(RarArchive.Open(stream, readerOptions));
}
stream.Seek(0, SeekOrigin.Begin);
if (TarArchive.IsTarFile(stream))
{
stream.Seek(0, SeekOrigin.Begin);
return(TarArchive.Open(stream, readerOptions));
}
throw new InvalidOperationException("Cannot determine compressed stream type. Supported Archive Formats: Zip, GZip, Tar, Rar, 7Zip, LZip, Dmg");
}
public DmgVolume(DmgArchive archive, Stream stream, string fileName, Readers.ReaderOptions readerOptions)
: base(stream, readerOptions)
{
_archive = archive;
_fileName = fileName;
long pos = stream.Length - DmgHeader.HeaderSize;
if (pos < 0)
{
throw new InvalidFormatException("Invalid DMG volume");
}
stream.Position = pos;
if (DmgHeader.TryRead(stream, out var header))
{
Header = header !;
}
else
{
throw new InvalidFormatException("Invalid DMG volume");
}
}
