fix wrong assumption to file start

Co-authored-by: Alex Aperis <[email protected]>

.github/integration/tests/common/50_check_endpoint.sh

@@ -92,26 +92,28 @@ fi
 
 curl --cacert certs/ca.pem -H "Authorization: Bearer $token" "https://localhost:8443/files/urn:neic:001-002?startCoordinate=0&endCoordinate=2" --output test-part.txt
 
-echo "TH" > old-part.txt
+dd if=old-file.txt ibs=1 skip=0 count=2 > old-part.txt
 
 cmp --silent old-part.txt test-part.txt
 status=$?
 if [[ $status = 0 ]]; then
     echo "Files are the same"
 else
     echo "Files are different"
+    exit 1
 fi
 
 curl --cacert certs/ca.pem -H "Authorization: Bearer $token" "https://localhost:8443/files/urn:neic:001-002?startCoordinate=7&endCoordinate=14" --output test-part2.txt
 
-echo "LE IS J" > old-part2.txt
+dd if=old-file.txt ibs=1 skip=7 count=7 > old-part2.txt
 
 cmp --silent old-part2.txt test-part2.txt
 status=$?
 if [[ $status = 0 ]]; then
     echo "Files are the same"
 else
     echo "Files are different"
+    exit 1
 fi
 
 # ------------------

.github/integration/tests/s3notls/52_check_endpoint.sh

@@ -88,26 +88,28 @@ fi
 
 curl -H "Authorization: Bearer $token" "http://localhost:8080/files/urn:neic:001-002?startCoordinate=0&endCoordinate=2" --output test-part.txt
 
-echo "TH" > old-part.txt
+dd if=old-file.txt ibs=1 skip=0 count=2 > old-part.txt
 
 cmp --silent old-part.txt test-part.txt
 status=$?
 if [[ $status = 0 ]]; then
     echo "Files are the same"
 else
     echo "Files are different"
+    exit 1
 fi
 
 curl -H "Authorization: Bearer $token" "http://localhost:8080/files/urn:neic:001-002?startCoordinate=7&endCoordinate=14" --output test-part2.txt
 
-echo "LE IS J" > old-part2.txt
+dd if=old-file.txt ibs=1 skip=7 count=7 > old-part2.txt
 
 cmp --silent old-part2.txt test-part2.txt
 status=$?
 if [[ $status = 0 ]]; then
     echo "Files are the same"
 else
     echo "Files are different"
+    exit 1
 fi
 
 # ------------------

api/sda/sda.go

@@ -255,6 +255,13 @@ func Download(c *gin.Context) {
 // used from: https://github.com/neicnordic/crypt4gh/blob/master/examples/reader/main.go#L48C1-L113C1
 var sendStream = func(reader *streaming.Crypt4GHReader, writer http.ResponseWriter, start, end int64) error {
 
+	if start != 0 {
+		// We don't want to read from start, skip ahead to where we should be
+		if _, err := reader.Seek(start, 0); err != nil {
+			return err
+		}
+	}
+
 	// Calculate how much we should read (if given)
 	togo := end - start