adding on-the-fly compression

config/default.js

@@ -14,7 +14,21 @@ config.target = {
   port: "5678"
 };
 
-// transfer syntax (e.g. compression of dicom files) used for transmission via wado
+
+/*
+Supported Transfer Syntaxes:
+1.2.840.10008.1.2       Implicit VR Endian: Default Transfer Syntax for DICOM    
+1.2.840.10008.1.2.1     Explicit VR Little Endian    
+1.2.840.10008.1.2.2     Explicit VR Big Endian   
+1.2.840.10008.1.2.4.50  JPEG Baseline (Process 1) - Lossy JPEG 8-bit Image Compression
+1.2.840.10008.1.2.4.51  JPEG Baseline (Processes 2 & 4) - Lossy JPEG 12-bit Image Compression
+1.2.840.10008.1.2.4.70  JPEG Lossless, Nonhierarchical, First- Order Prediction
+1.2.840.10008.1.2.4.80  JPEG-LS Lossless Image Compression   <-- recommended
+1.2.840.10008.1.2.4.81  JPEG-LS Lossy (Near- Lossless) Image Compression
+1.2.840.10008.1.2.5     RLE Lossless
+*/
+
+// transfer syntax (e.g. compression of dicom files) used for transmission via wado and proposed to pacs
 config.transferSyntax = '1.2.840.10008.1.2.4.80';
 
 // log directory

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dicomweb-proxy",
-  "version": "1.0.18",
+  "version": "1.1.0",
   "description": "A proxy to translate between dicomweb and dimse",
   "main": "app.js",
   "scripts": {
@@ -28,7 +28,7 @@
   "dependencies": {
     "config": "^3.3.4",
     "dicom-data-dictionary": "^0.3.1",
-    "dicom-dimse-native": "^1.2.11",
+    "dicom-dimse-native": "^1.2.12",
     "dicom-parser": "^1.8.7",
     "fastify": "^3.12.0",
     "fastify-cors": "^4.1.0",

src/app.js

@@ -105,7 +105,7 @@ fastify.get('/viewer/wadouri', async (req, reply) => {
   }
   const storagePath = config.get('storagePath');
   const studyPath = path.join(storagePath, studyUid)
-  const pathname = path.join(storagePath, studyUid, imageUid);
+  const pathname = path.join(studyPath, imageUid);
   try {
     await utils.fileExists(pathname);
   } catch (error) {

src/utils.js

@@ -62,6 +62,10 @@ const fetchData = async (studyUid, seriesUid) => {
   };
 
   // set source and target from config
+  const ts = config.get('transferSyntax');
+  j.netTransferPrefer = ts;
+  j.netTransferPropose = ts;
+  j.writeTransfer = ts; 
   j.source = config.get("source");
   j.target = config.get("target");
   j.verbose = config.get("verboseLogging");
@@ -123,10 +127,14 @@ const utils = {
     await storage.init({ dir: storagePath });
   },
   startScp: () => {
+    const ts = config.get('transferSyntax');
     const j = {};
     j.source = config.get("source");
     j.storagePath = config.get("storagePath");
     j.verbose = config.get("verboseLogging");
+    j.netTransferPrefer = ts;
+    j.netTransferPropose = ts;
+    j.writeTransfer = ts; 
     j.peers = [config.get("target")];
     j.permissive = false;
 
@@ -215,8 +223,6 @@ const utils = {
       verbose: config.get('verboseLogging'),
     };
 
-    console.log(j);
-
     // run find scu and return json response
     return new Promise((resolve, reject) => {
       dimse.recompress(JSON.stringify(j), (result) => {