--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Core/DicomFormat/DicomInstanceHasher.cpp	Fri Nov 09 11:13:29 2012 +0100
@@ -0,0 +1,82 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
+ * 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 "DicomInstanceHasher.h"
+
+#include "../OrthancException.h"
+#include "../Toolbox.h"
+
+namespace Orthanc
+{
+  DicomInstanceHasher::DicomInstanceHasher(const DicomMap& instance)
+  {
+    patientId_ = instance.GetValue(DICOM_TAG_PATIENT_ID).AsString();
+    instanceUid_ = instance.GetValue(DICOM_TAG_SOP_INSTANCE_UID).AsString();
+    seriesUid_ = instance.GetValue(DICOM_TAG_SERIES_INSTANCE_UID).AsString();
+    studyUid_ = instance.GetValue(DICOM_TAG_STUDY_INSTANCE_UID).AsString();
+
+    if (patientId_.size() == 0 ||
+        instanceUid_.size() == 0 ||
+        seriesUid_.size() == 0 ||
+        studyUid_.size() == 0)
+    {
+      throw OrthancException(ErrorCode_BadFileFormat);
+    }
+  }
+
+  std::string DicomInstanceHasher::HashPatient() const
+  {
+    std::string s;
+    Toolbox::ComputeSHA1(s, patientId_);
+    return s;
+  }
+
+  std::string DicomInstanceHasher::HashStudy() const
+  {
+    std::string s;
+    Toolbox::ComputeSHA1(s, patientId_ + "|" + studyUid_);
+    return s;
+  }
+
+  std::string DicomInstanceHasher::HashSeries() const
+  {
+    std::string s;
+    Toolbox::ComputeSHA1(s, patientId_ + "|" + studyUid_ + "|" + seriesUid_);
+    return s;
+  }
+
+  std::string DicomInstanceHasher::HashInstance() const
+  {
+    std::string s;
+    Toolbox::ComputeSHA1(s, patientId_ + "|" + studyUid_ + "|" + seriesUid_ + "|" + instanceUid_);
+    return s;
+  }
+}