--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancServer/Plugins/Samples/Common/DicomDatasetReader.cpp	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,173 @@
+/**
+ * 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 "DicomDatasetReader.h"
+
+#include "OrthancPluginException.h"
+
+#include <boost/lexical_cast.hpp>
+
+namespace OrthancPlugins
+{
+  // This function is copied-pasted from "../../../Core/Toolbox.cpp",
+  // in order to avoid the dependency of plugins against the Orthanc core
+  static std::string StripSpaces(const std::string& source)
+  {
+    size_t first = 0;
+
+    while (first < source.length() &&
+           isspace(source[first]))
+    {
+      first++;
+    }
+
+    if (first == source.length())
+    {
+      // String containing only spaces
+      return "";
+    }
+
+    size_t last = source.length();
+    while (last > first &&
+           isspace(source[last - 1]))
+    {
+      last--;
+    }          
+    
+    assert(first <= last);
+    return source.substr(first, last - first);
+  }
+
+
+  DicomDatasetReader::DicomDatasetReader(const IDicomDataset& dataset) :
+    dataset_(dataset)
+  {
+  }
+  
+
+  std::string DicomDatasetReader::GetStringValue(const DicomPath& path,
+                                                 const std::string& defaultValue) const
+  {
+    std::string s;
+    if (dataset_.GetStringValue(s, path))
+    {
+      return s;
+    }
+    else
+    {
+      return defaultValue;
+    }
+  }
+
+
+  std::string DicomDatasetReader::GetMandatoryStringValue(const DicomPath& path) const
+  {
+    std::string s;
+    if (dataset_.GetStringValue(s, path))
+    {
+      return s;
+    }
+    else
+    {
+      ORTHANC_PLUGINS_THROW_EXCEPTION(InexistentTag);
+    }
+  }
+
+
+  template <typename T>
+  static bool GetValueInternal(T& target,
+                               const IDicomDataset& dataset,
+                               const DicomPath& path)
+  {
+    try
+    {
+      std::string s;
+
+      if (dataset.GetStringValue(s, path))
+      {
+        target = boost::lexical_cast<T>(StripSpaces(s));
+        return true;
+      }
+      else
+      {
+        return false;
+      }
+    }
+    catch (boost::bad_lexical_cast&)
+    {
+      ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);        
+    }
+  }
+
+
+  bool DicomDatasetReader::GetIntegerValue(int& target,
+                                           const DicomPath& path) const
+  {
+    return GetValueInternal<int>(target, dataset_, path);
+  }
+
+
+  bool DicomDatasetReader::GetUnsignedIntegerValue(unsigned int& target,
+                                                   const DicomPath& path) const
+  {
+    int value;
+
+    if (!GetIntegerValue(value, path))
+    {
+      return false;
+    }
+    else if (value >= 0)
+    {
+      target = static_cast<unsigned int>(value);
+      return true;
+    }
+    else
+    {
+      ORTHANC_PLUGINS_THROW_EXCEPTION(ParameterOutOfRange);
+    }
+  }
+
+
+  bool DicomDatasetReader::GetFloatValue(float& target,
+                                         const DicomPath& path) const
+  {
+    return GetValueInternal<float>(target, dataset_, path);
+  }
+
+
+  bool DicomDatasetReader::GetDoubleValue(double& target,
+                                          const DicomPath& path) const
+  {
+    return GetValueInternal<double>(target, dataset_, path);
+  }
+}