CmisSync.Lib.Streams.NonClosingHashStream.Read C# (CSharp) Method

        public override int Read(byte[] buffer, int offset, int count) {
            int result = base.Read(buffer, offset, count);
            if (this.mode == CryptoStreamMode.Read) {
                this.hashAlg.TransformBlock(buffer, offset, result, buffer, offset);
            }

            return result;
        }

        /// <summary>
        /// Uploads the file content to the remote document.
        /// </summary>
        /// <returns>The SHA-1 hash of the uploaded file content.</returns>
        /// <param name="localFile">Local file.</param>
        /// <param name="doc">Remote document.</param>
        /// <param name="transmissionManager">Transmission manager.</param>
        /// <param name="transmissionEvent">File Transmission event.</param>
        /// <param name="mappedObject">Mapped object saved in <c>Storage</c></param>
        protected byte[] UploadFileWithPWC(IFileInfo localFile, ref IDocument doc, Transmission transmission, IMappedObject mappedObject = null) {
            byte[] checksum = null;
            var docPWC = this.LoadRemotePWCDocument(doc, ref checksum);

            using (var file = localFile.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete)) {
                if (checksum != null) {
                    // check PWC checksum for integration
                    using (var hashAlg = new SHA1Managed()) {
                        int bufsize = 8 * 1024;
                        byte[] buffer = new byte[bufsize];
                        for (long offset = 0; offset < docPWC.ContentStreamLength.GetValueOrDefault();) {
                            int readsize = bufsize;
                            if (readsize + offset > docPWC.ContentStreamLength.GetValueOrDefault()) {
                                readsize = (int)(docPWC.ContentStreamLength.GetValueOrDefault() - offset);
                            }

                            readsize = file.Read(buffer, 0, readsize);
                            hashAlg.TransformBlock(buffer, 0, readsize, buffer, 0);
                            offset += readsize;
                            if (readsize == 0) {
                                break;
                            }
                        }

                        hashAlg.TransformFinalBlock(new byte[0], 0, 0);
                        if (!hashAlg.Hash.SequenceEqual(checksum)) {
                            docPWC.DeleteContentStream();
                        }

                        file.Seek(0, SeekOrigin.Begin);
                    }
                }

                byte[] hash = null;
                var uploader = FileTransmission.ContentTaskUtils.CreateUploader(this.TransmissionStorage.ChunkSize);
                using (var hashAlg = new SHA1Reuse()) {
                    try {
                        using (var hashstream = new NonClosingHashStream(file, hashAlg, CryptoStreamMode.Read)) {
                            int bufsize = 8 * 1024;
                            byte[] buffer = new byte[bufsize];
                            for (long offset = 0; offset < docPWC.ContentStreamLength.GetValueOrDefault();) {
                                int readsize = bufsize;
                                if (readsize + offset > docPWC.ContentStreamLength.GetValueOrDefault()) {
                                    readsize = (int)(docPWC.ContentStreamLength.GetValueOrDefault() - offset);
                                }

                                readsize = hashstream.Read(buffer, 0, readsize);
                                offset += readsize;
                                if (readsize == 0) {
                                    break;
                                }
                            }
                        }

                        var document = doc;
                        uploader.UploadFile(docPWC, file, transmission, hashAlg, false, (byte[] checksumUpdate, long length) => this.SaveRemotePWCDocument(localFile, document, docPWC, checksumUpdate, transmission));
                        hash = hashAlg.Hash;
                    } catch (Exception ex) {
                        transmission.FailedException = ex;
                        throw;
                    }
                }

                this.TransmissionStorage.RemoveObjectByRemoteObjectId(doc.Id);

                var properties = new Dictionary<string, object>();
                properties.Add(PropertyIds.LastModificationDate, localFile.LastWriteTimeUtc);
                doc = this.Session.GetObject(docPWC.CheckIn(true, properties, null, string.Empty)) as IDocument;

                // Refresh is required, or DotCMIS will use cached one only
                doc.Refresh();

                transmission.Status = TransmissionStatus.FINISHED;
                return hash;
            }
        }