public TarEntry GetNextEntry()

in src/ICSharpCode.SharpZipLib/Tar/TarInputStream.cs [441:596]
127 lines of code
26 McCabe index (conditional complexity)

		public TarEntry GetNextEntry()
		{
			if (hasHitEOF)
			{
				return null;
			}

			if (currentEntry != null)
			{
				SkipToNextEntry();
			}

			byte[] headerBuf = tarBuffer.ReadBlock();

			if (headerBuf == null)
			{
				hasHitEOF = true;
			}
			else if (TarBuffer.IsEndOfArchiveBlock(headerBuf))
			{
				hasHitEOF = true;

				// Read the second zero-filled block
				tarBuffer.ReadBlock();
			}
			else
			{
				hasHitEOF = false;
			}

			if (hasHitEOF)
			{
				currentEntry = null;
			}
			else
			{
				try
				{
					var header = new TarHeader();
					header.ParseBuffer(headerBuf, encoding);
					if (!header.IsChecksumValid)
					{
						throw new TarException("Header checksum is invalid");
					}
					this.entryOffset = 0;
					this.entrySize = header.Size;

					StringBuilder longName = null;

					if (header.TypeFlag == TarHeader.LF_GNU_LONGNAME)
					{
						byte[] nameBuffer = new byte[TarBuffer.BlockSize];
						long numToRead = this.entrySize;

						longName = new StringBuilder();

						while (numToRead > 0)
						{
							int numRead = this.Read(nameBuffer, 0, (numToRead > nameBuffer.Length ? nameBuffer.Length : (int)numToRead));

							if (numRead == -1)
							{
								throw new InvalidHeaderException("Failed to read long name entry");
							}

							longName.Append(TarHeader.ParseName(nameBuffer, 0, numRead, encoding).ToString());
							numToRead -= numRead;
						}

						SkipToNextEntry();
						headerBuf = this.tarBuffer.ReadBlock();
					}
					else if (header.TypeFlag == TarHeader.LF_GHDR)
					{  // POSIX global extended header
					   // Ignore things we dont understand completely for now
						SkipToNextEntry();
						headerBuf = this.tarBuffer.ReadBlock();
					}
					else if (header.TypeFlag == TarHeader.LF_XHDR)
					{  // POSIX extended header
						byte[] nameBuffer = new byte[TarBuffer.BlockSize];
						long numToRead = this.entrySize;

						var xhr = new TarExtendedHeaderReader();

						while (numToRead > 0)
						{
							int numRead = this.Read(nameBuffer, 0, (numToRead > nameBuffer.Length ? nameBuffer.Length : (int)numToRead));

							if (numRead == -1)
							{
								throw new InvalidHeaderException("Failed to read long name entry");
							}

							xhr.Read(nameBuffer, numRead);
							numToRead -= numRead;
						}

						if (xhr.Headers.TryGetValue("path", out string name))
						{
							longName = new StringBuilder(name);
						}

						SkipToNextEntry();
						headerBuf = this.tarBuffer.ReadBlock();
					}
					else if (header.TypeFlag == TarHeader.LF_GNU_VOLHDR)
					{
						// TODO: could show volume name when verbose
						SkipToNextEntry();
						headerBuf = this.tarBuffer.ReadBlock();
					}
					else if (header.TypeFlag != TarHeader.LF_NORMAL &&
							 header.TypeFlag != TarHeader.LF_OLDNORM &&
							 header.TypeFlag != TarHeader.LF_LINK &&
							 header.TypeFlag != TarHeader.LF_SYMLINK &&
							 header.TypeFlag != TarHeader.LF_DIR)
					{
						// Ignore things we dont understand completely for now
						SkipToNextEntry();
						headerBuf = tarBuffer.ReadBlock();
					}

					if (entryFactory == null)
					{
						currentEntry = new TarEntry(headerBuf, encoding);
						if (longName != null)
						{
							currentEntry.Name = longName.ToString();
						}
					}
					else
					{
						currentEntry = entryFactory.CreateEntry(headerBuf);
					}

					// Magic was checked here for 'ustar' but there are multiple valid possibilities
					// so this is not done anymore.

					entryOffset = 0;

					// TODO: Review How do we resolve this discrepancy?!
					entrySize = this.currentEntry.Size;
				}
				catch (InvalidHeaderException ex)
				{
					entrySize = 0;
					entryOffset = 0;
					currentEntry = null;
					string errorText = string.Format("Bad header in record {0} block {1} {2}",
						tarBuffer.CurrentRecord, tarBuffer.CurrentBlock, ex.Message);
					throw new InvalidHeaderException(errorText);
				}
			}
			return currentEntry;
		}