--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/DicomFormat/DicomInstanceHasher.cpp	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,109 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "../PrecompiledHeaders.h"
+#include "DicomInstanceHasher.h"
+
+#include "../OrthancException.h"
+#include "../Toolbox.h"
+
+namespace Orthanc
+{
+  void DicomInstanceHasher::Setup(const std::string& patientId,
+                                  const std::string& studyUid,
+                                  const std::string& seriesUid,
+                                  const std::string& instanceUid)
+  {
+    patientId_ = patientId;
+    studyUid_ = studyUid;
+    seriesUid_ = seriesUid;
+    instanceUid_ = instanceUid;
+
+    if (studyUid_.size() == 0 ||
+        seriesUid_.size() == 0 ||
+        instanceUid_.size() == 0)
+    {
+      throw OrthancException(ErrorCode_BadFileFormat, "missing StudyInstanceUID, SeriesInstanceUID or SOPInstanceUID");
+    }
+  }
+
+  DicomInstanceHasher::DicomInstanceHasher(const DicomMap& instance)
+  {
+    const DicomValue* patientId = instance.TestAndGetValue(DICOM_TAG_PATIENT_ID);
+
+    Setup(patientId == NULL ? "" : patientId->GetContent(),
+          instance.GetValue(DICOM_TAG_STUDY_INSTANCE_UID).GetContent(),
+          instance.GetValue(DICOM_TAG_SERIES_INSTANCE_UID).GetContent(),
+          instance.GetValue(DICOM_TAG_SOP_INSTANCE_UID).GetContent());
+  }
+
+  const std::string& DicomInstanceHasher::HashPatient()
+  {
+    if (patientHash_.size() == 0)
+    {
+      Toolbox::ComputeSHA1(patientHash_, patientId_);
+    }
+
+    return patientHash_;
+  }
+
+  const std::string& DicomInstanceHasher::HashStudy()
+  {
+    if (studyHash_.size() == 0)
+    {
+      Toolbox::ComputeSHA1(studyHash_, patientId_ + "|" + studyUid_);
+    }
+
+    return studyHash_;
+  }
+
+  const std::string& DicomInstanceHasher::HashSeries()
+  {
+    if (seriesHash_.size() == 0)
+    {
+      Toolbox::ComputeSHA1(seriesHash_, patientId_ + "|" + studyUid_ + "|" + seriesUid_);
+    }
+
+    return seriesHash_;
+  }
+
+  const std::string& DicomInstanceHasher::HashInstance()
+  {
+    if (instanceHash_.size() == 0)
+    {
+      Toolbox::ComputeSHA1(instanceHash_, patientId_ + "|" + studyUid_ + "|" + seriesUid_ + "|" + instanceUid_);
+    }
+
+    return instanceHash_;
+  }
+}