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

        private void SetFdpLoh()
        {
            // The value for FileDataPosition has not yet been set.
            // Therefore, seek to the local header, and figure the start of file data.
            // workitem 8098: ok (restore)
            long origPosition = this.ArchiveStream.Position;
            try
            {
                this.ArchiveStream.Seek(this._RelativeOffsetOfLocalHeader, SeekOrigin.Begin);

                // workitem 10178
                Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);
            }
            catch (System.IO.IOException exc1)
            {
                string description = String.Format("Exception seeking  entry({0}) offset(0x{1:X8}) len(0x{2:X8})",
                                                   this.FileName, this._RelativeOffsetOfLocalHeader,
                                                   this.ArchiveStream.Length);
                throw new BadStateException(description, exc1);
            }

            byte[] block = new byte[30];
            this.ArchiveStream.Read(block, 0, block.Length);

            // At this point we could verify the contents read from the local header
            // with the contents read from the central header.  We could, but don't need to.
            // So we won't.

            Int16 filenameLength = (short)(block[26] + block[27] * 256);
            Int16 extraFieldLength = (short)(block[28] + block[29] * 256);

            // Console.WriteLine("  pos  0x{0:X8} ({0})", this.ArchiveStream.Position);
            // Console.WriteLine("  seek 0x{0:X8} ({0})", filenameLength + extraFieldLength);

            this.ArchiveStream.Seek(filenameLength + extraFieldLength, SeekOrigin.Current);
            // workitem 10178
            Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);

            this._LengthOfHeader = 30 + extraFieldLength + filenameLength +
                GetLengthOfCryptoHeaderBytes(_Encryption_FromZipFile);

            // Console.WriteLine("  ROLH  0x{0:X8} ({0})", _RelativeOffsetOfLocalHeader);
            // Console.WriteLine("  LOH   0x{0:X8} ({0})", _LengthOfHeader);
            // workitem 8098: ok (arithmetic)
            this.__FileDataPosition = _RelativeOffsetOfLocalHeader + _LengthOfHeader;
            // Console.WriteLine("  FDP   0x{0:X8} ({0})", __FileDataPosition);

            // restore file position:
            // workitem 8098: ok (restore)
            this.ArchiveStream.Seek(origPosition, SeekOrigin.Begin);
            // workitem 10178
            Crisis.Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(this.ArchiveStream);
        }