public bool TestArchive()

in src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs [941:1082]
112 lines of code
25 McCabe index (conditional complexity)

		public bool TestArchive(bool testData, TestStrategy strategy, ZipTestResultHandler resultHandler)
		{
			if (isDisposed_)
			{
				throw new ObjectDisposedException("ZipFile");
			}

			var status = new TestStatus(this);

			resultHandler?.Invoke(status, null);

			HeaderTest test = testData ? (HeaderTest.Header | HeaderTest.Extract) : HeaderTest.Header;

			bool testing = true;

			try
			{
				int entryIndex = 0;

				while (testing && (entryIndex < Count))
				{
					if (resultHandler != null)
					{
						status.SetEntry(this[entryIndex]);
						status.SetOperation(TestOperation.EntryHeader);
						resultHandler(status, null);
					}

					try
					{
						TestLocalHeader(this[entryIndex], test);
					}
					catch (ZipException ex)
					{
						status.AddError();

						resultHandler?.Invoke(status, $"Exception during test - '{ex.Message}'");

						testing &= strategy != TestStrategy.FindFirstError;
					}

					if (testing && testData && this[entryIndex].IsFile)
					{
						// Don't check CRC for AES encrypted archives
						var checkCRC = this[entryIndex].AESKeySize == 0;

						if (resultHandler != null)
						{
							status.SetOperation(TestOperation.EntryData);
							resultHandler(status, null);
						}

						var crc = new Crc32();

						using (Stream entryStream = this.GetInputStream(this[entryIndex]))
						{
							byte[] buffer = new byte[4096];
							long totalBytes = 0;
							int bytesRead;
							while ((bytesRead = entryStream.Read(buffer, 0, buffer.Length)) > 0)
							{
								if (checkCRC)
								{
									crc.Update(new ArraySegment<byte>(buffer, 0, bytesRead));
								}

								if (resultHandler != null)
								{
									totalBytes += bytesRead;
									status.SetBytesTested(totalBytes);
									resultHandler(status, null);
								}
							}
						}

						if (checkCRC && this[entryIndex].Crc != crc.Value)
						{
							status.AddError();

							resultHandler?.Invoke(status, "CRC mismatch");

							testing &= strategy != TestStrategy.FindFirstError;
						}

						if ((this[entryIndex].Flags & (int)GeneralBitFlags.Descriptor) != 0)
						{
							var data = new DescriptorData();
							ZipFormat.ReadDataDescriptor(baseStream_, this[entryIndex].LocalHeaderRequiresZip64, data);
							if (checkCRC && this[entryIndex].Crc != data.Crc)
							{
								status.AddError();
								resultHandler?.Invoke(status, "Descriptor CRC mismatch");
							}

							if (this[entryIndex].CompressedSize != data.CompressedSize)
							{
								status.AddError();
								resultHandler?.Invoke(status, "Descriptor compressed size mismatch");
							}

							if (this[entryIndex].Size != data.Size)
							{
								status.AddError();
								resultHandler?.Invoke(status, "Descriptor size mismatch");
							}
						}
					}

					if (resultHandler != null)
					{
						status.SetOperation(TestOperation.EntryComplete);
						resultHandler(status, null);
					}

					entryIndex += 1;
				}

				if (resultHandler != null)
				{
					status.SetOperation(TestOperation.MiscellaneousTests);
					resultHandler(status, null);
				}

				// TODO: the 'Corrina Johns' test where local headers are missing from
				// the central directory.  They are therefore invisible to many archivers.
			}
			catch (Exception ex)
			{
				status.AddError();

				resultHandler?.Invoke(status, $"Exception during test - '{ex.Message}'");
			}

			if (resultHandler != null)
			{
				status.SetOperation(TestOperation.Complete);
				status.SetEntry(null);
				resultHandler(status, null);
			}

			return (status.ErrorCount == 0);
		}