Novacode.DocX.merge_images C# (CSharp) Method

        private void merge_images(PackagePart remote_pp, DocX remote_document, XDocument remote_mainDoc, String contentType)
        {
            // Before doing any other work, check to see if this image is actually referenced in the document.
            // In my testing I have found cases of Images inside documents that are not referenced
            var remote_rel = remote_document.mainPart.GetRelationships().Where(r => r.TargetUri.OriginalString.Equals(remote_pp.Uri.OriginalString.Replace("/word/", ""))).FirstOrDefault();
            if (remote_rel == null) {
                remote_rel = remote_document.mainPart.GetRelationships().Where(r => r.TargetUri.OriginalString.Equals(remote_pp.Uri.OriginalString)).FirstOrDefault();
                if (remote_rel == null)
                    return;
            }
            String remote_Id = remote_rel.Id;

            String remote_hash = ComputeMD5HashString(remote_pp.GetStream());
            var image_parts = package.GetParts().Where(pp => pp.ContentType.Equals(contentType));

            bool found = false;
            foreach (var part in image_parts)
            {
                String local_hash = ComputeMD5HashString(part.GetStream());
                if (local_hash.Equals(remote_hash))
                {
                    // This image already exists in this document.
                    found = true;

                    var local_rel = mainPart.GetRelationships().Where(r => r.TargetUri.OriginalString.Equals(part.Uri.OriginalString.Replace("/word/", ""))).FirstOrDefault();
                    if (local_rel == null)
                    {
                        local_rel = mainPart.GetRelationships().Where(r => r.TargetUri.OriginalString.Equals(part.Uri.OriginalString)).FirstOrDefault();
                    }
                    if (local_rel != null)
                    {
                        String new_Id = local_rel.Id;

                        // Replace all instances of remote_Id in the local document with local_Id
                        var elems = remote_mainDoc.Descendants(XName.Get("blip", a.NamespaceName));
                        foreach (var elem in elems)
                        {
                            XAttribute embed = elem.Attribute(XName.Get("embed", r.NamespaceName));
                            if (embed != null && embed.Value == remote_Id)
                            {
                                embed.SetValue(new_Id);
                            }
                        }

                        // Replace all instances of remote_Id in the local document with local_Id (for shapes as well)
                        var v_elems = remote_mainDoc.Descendants(XName.Get("imagedata", v.NamespaceName));
                        foreach (var elem in v_elems)
                        {
                            XAttribute id = elem.Attribute(XName.Get("id", r.NamespaceName));
                            if (id != null && id.Value == remote_Id)
                            {
                                id.SetValue(new_Id);
                            }
                        }
                    }

                    break;
                }
            }

            // This image does not exist in this document.
            if (!found)
            {
                String new_uri = remote_pp.Uri.OriginalString;
                new_uri = new_uri.Remove(new_uri.LastIndexOf("/"));
                //new_uri = new_uri.Replace("word/", "");
                new_uri += "/" + Guid.NewGuid() + contentType.Replace("image/", ".");
                if (!new_uri.StartsWith("/"))
                    new_uri = "/" + new_uri;

                PackagePart new_pp = package.CreatePart(new Uri(new_uri, UriKind.Relative), remote_pp.ContentType, CompressionOption.Normal);

                using (Stream s_read = remote_pp.GetStream())
                {
                    using (Stream s_write = new PackagePartStream(new_pp.GetStream(FileMode.Create)))
                    {
                        byte[] buffer = new byte[32768];
                        int read;
                        while ((read = s_read.Read(buffer, 0, buffer.Length)) > 0)
                        {
                            s_write.Write(buffer, 0, read);
                        }
                    }
                }

                PackageRelationship pr = mainPart.CreateRelationship(new Uri(new_uri, UriKind.Relative), TargetMode.Internal, "http://schemas.openxmlformats.org/officeDocument/2006/relationships/image");

                String new_Id = pr.Id;

                //Check if the remote relationship id is a default rId from Word
                Match defRelId = Regex.Match(remote_Id, @"rId\d+", RegexOptions.IgnoreCase);

                // Replace all instances of remote_Id in the local document with local_Id
                var elems = remote_mainDoc.Descendants(XName.Get("blip", a.NamespaceName));
                foreach (var elem in elems)
                {
                    XAttribute embed = elem.Attribute(XName.Get("embed", r.NamespaceName));
                    if (embed != null && embed.Value == remote_Id)
                    {
                        embed.SetValue(new_Id);
                    }
                }

                if (!defRelId.Success)
                {
                    // Replace all instances of remote_Id in the local document with local_Id
                    var elems_local = mainDoc.Descendants(XName.Get("blip", a.NamespaceName));
                    foreach (var elem in elems_local)
                    {
                        XAttribute embed = elem.Attribute(XName.Get("embed", r.NamespaceName));
                        if (embed != null && embed.Value == remote_Id)
                        {
                            embed.SetValue(new_Id);
                        }
                    }

                    // Replace all instances of remote_Id in the local document with local_Id
                    var v_elems_local = mainDoc.Descendants(XName.Get("imagedata", v.NamespaceName));
                    foreach (var elem in v_elems_local)
                    {
                        XAttribute id = elem.Attribute(XName.Get("id", r.NamespaceName));
                        if (id != null && id.Value == remote_Id)
                        {
                            id.SetValue(new_Id);
                        }
                    }
                }

                // Replace all instances of remote_Id in the local document with local_Id (for shapes as well)
                var v_elems = remote_mainDoc.Descendants(XName.Get("imagedata", v.NamespaceName));
                foreach (var elem in v_elems)
                {
                    XAttribute id = elem.Attribute(XName.Get("id", r.NamespaceName));
                    if (id != null && id.Value == remote_Id)
                    {
                        id.SetValue(new_Id);
                    }
                }
            }
        }