Crisis.Ionic.Zip.ZipEntry.HandleUnexpectedDataDescriptor C# (CSharp) Метод

        private static void HandleUnexpectedDataDescriptor(ZipEntry entry)
        {
            Stream s = entry.ArchiveStream;

            // In some cases, the "data descriptor" is present, without a signature, even when
            // bit 3 of the BitField is NOT SET.  This is the CRC, followed
            //    by the compressed length and the uncompressed length (4 bytes for each
            //    of those three elements).  Need to check that here.
            //
            uint datum = (uint)Crisis.Ionic.Zip.SharedUtilities.ReadInt(s);
            if (datum == entry._Crc32)
            {
                int sz = Crisis.Ionic.Zip.SharedUtilities.ReadInt(s);
                if (sz == entry._CompressedSize)
                {
                    sz = Crisis.Ionic.Zip.SharedUtilities.ReadInt(s);
                    if (sz == entry._UncompressedSize)
                    {
                        // ignore everything and discard it.
                    }
                    else
                    {
                        s.Seek(-12, SeekOrigin.Current); // unread the three blocks

                        // workitem 10178
                        Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(s);
                    }
                }
                else
                {
                    s.Seek(-8, SeekOrigin.Current); // unread the two blocks

                    // workitem 10178
                    Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(s);
                }
            }
            else
            {
                s.Seek(-4, SeekOrigin.Current); // unread the block

                // workitem 10178
                Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(s);
            }
        }