Mercurial > hg > orthanc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/Samples/Common/OrthancPluginCppWrapper.cpp	Fri Jun 24 22:28:25 2016 +0200
@@ -0,0 +1,829 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital 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 "OrthancPluginCppWrapper.h"
+
+#include <json/reader.h>
+
+
+namespace OrthancPlugins
+{
+  const char* PluginException::GetErrorDescription(OrthancPluginContext* context) const
+  {
+    const char* description = OrthancPluginGetErrorDescription(context, code_);
+    if (description)
+    {
+      return description;
+    }
+    else
+    {
+      return "No description available";
+    }
+  }
+
+
+  MemoryBuffer::MemoryBuffer(OrthancPluginContext* context) :
+    context_(context)
+  {
+    buffer_.data = NULL;
+    buffer_.size = 0;
+  }
+
+
+  void MemoryBuffer::Clear()
+  {
+    if (buffer_.data != NULL)
+    {
+      OrthancPluginFreeMemoryBuffer(context_, &buffer_);
+      buffer_.data = NULL;
+      buffer_.size = 0;
+    }
+  }
+
+
+  void MemoryBuffer::Assign(OrthancPluginMemoryBuffer& other)
+  {
+    Clear();
+
+    buffer_.data = other.data;
+    buffer_.size = other.size;
+
+    other.data = NULL;
+    other.size = 0;
+  }
+
+
+  void MemoryBuffer::ToString(std::string& target) const
+  {
+    if (buffer_.size == 0)
+    {
+      target.clear();
+    }
+    else
+    {
+      target.assign(reinterpret_cast<const char*>(buffer_.data), buffer_.size);
+    }
+  }
+
+
+  void MemoryBuffer::ToJson(Json::Value& target) const
+  {
+    if (buffer_.data == NULL ||
+        buffer_.size == 0)
+    {
+      throw PluginException(OrthancPluginErrorCode_InternalError);
+    }
+
+    const char* tmp = reinterpret_cast<const char*>(buffer_.data);
+
+    Json::Reader reader;
+    if (!reader.parse(tmp, tmp + buffer_.size, target))
+    {
+      OrthancPluginLogError(context_, "Cannot convert some memory buffer to JSON");
+      throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+  }
+
+
+  bool MemoryBuffer::RestApiGet(const std::string& uri,
+                                bool applyPlugins)
+  {
+    Clear();
+
+    OrthancPluginErrorCode error;
+
+    if (applyPlugins)
+    {
+      error = OrthancPluginRestApiGetAfterPlugins(context_, &buffer_, uri.c_str());
+    }
+    else
+    {
+      error = OrthancPluginRestApiGet(context_, &buffer_, uri.c_str());
+    }
+
+    if (error == OrthancPluginErrorCode_Success)
+    {
+      return true;
+    }
+    else if (error == OrthancPluginErrorCode_UnknownResource ||
+             error == OrthancPluginErrorCode_InexistentItem)
+    {
+      return false;
+    }
+    else
+    {
+      throw PluginException(error);
+    }
+  }
+
+
+  bool MemoryBuffer::RestApiPost(const std::string& uri,
+                                 const char* body,
+                                 size_t bodySize,
+                                 bool applyPlugins)
+  {
+    Clear();
+
+    OrthancPluginErrorCode error;
+
+    if (applyPlugins)
+    {
+      error = OrthancPluginRestApiPostAfterPlugins(context_, &buffer_, uri.c_str(), body, bodySize);
+    }
+    else
+    {
+      error = OrthancPluginRestApiPost(context_, &buffer_, uri.c_str(), body, bodySize);
+    }
+
+    if (error == OrthancPluginErrorCode_Success)
+    {
+      return true;
+    }
+    else if (error == OrthancPluginErrorCode_UnknownResource ||
+             error == OrthancPluginErrorCode_InexistentItem)
+    {
+      return false;
+    }
+    else
+    {
+      throw PluginException(error);
+    }
+  }
+
+
+  bool MemoryBuffer::RestApiPut(const std::string& uri,
+                                const char* body,
+                                size_t bodySize,
+                                bool applyPlugins)
+  {
+    Clear();
+
+    OrthancPluginErrorCode error;
+
+    if (applyPlugins)
+    {
+      error = OrthancPluginRestApiPutAfterPlugins(context_, &buffer_, uri.c_str(), body, bodySize);
+    }
+    else
+    {
+      error = OrthancPluginRestApiPut(context_, &buffer_, uri.c_str(), body, bodySize);
+    }
+
+    if (error == OrthancPluginErrorCode_Success)
+    {
+      return true;
+    }
+    else if (error == OrthancPluginErrorCode_UnknownResource ||
+             error == OrthancPluginErrorCode_InexistentItem)
+    {
+      return false;
+    }
+    else
+    {
+      throw PluginException(error);
+    }
+  }
+
+
+  OrthancString::OrthancString(OrthancPluginContext* context,
+                               char* str) :
+    context_(context),
+    str_(str)
+  {
+  }
+
+
+  void OrthancString::Clear()
+  {
+    if (str_ != NULL)
+    {
+      OrthancPluginFreeString(context_, str_);
+      str_ = NULL;
+    }
+  }
+
+
+  void OrthancString::ToString(std::string& target) const
+  {
+    if (str_ == NULL)
+    {
+      target.clear();
+    }
+    else
+    {
+      target.assign(str_);
+    }
+  }
+
+
+  void OrthancString::ToJson(Json::Value& target) const
+  {
+    if (str_ == NULL)
+    {
+      OrthancPluginLogError(context_, "Cannot convert an empty memory buffer to JSON");
+      throw PluginException(OrthancPluginErrorCode_InternalError);
+    }
+
+    Json::Reader reader;
+    if (!reader.parse(str_, target))
+    {
+      OrthancPluginLogError(context_, "Cannot convert some memory buffer to JSON");
+      throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+  }
+
+
+  OrthancConfiguration::OrthancConfiguration(OrthancPluginContext* context) :
+    context_(context)
+  {
+    OrthancString str(context, OrthancPluginGetConfiguration(context));
+
+    if (str.GetContent() == NULL)
+    {
+      OrthancPluginLogError(context, "Cannot access the Orthanc configuration");
+      throw PluginException(OrthancPluginErrorCode_InternalError);
+    }
+
+    str.ToJson(configuration_);
+
+    if (configuration_.type() != Json::objectValue)
+    {
+      OrthancPluginLogError(context, "Unable to read the Orthanc configuration");
+      throw PluginException(OrthancPluginErrorCode_InternalError);
+    }
+  }
+
+
+  OrthancPluginContext* OrthancConfiguration::GetContext() const
+  {
+    if (context_ == NULL)
+    {
+      throw PluginException(OrthancPluginErrorCode_Plugin);
+    }
+    else
+    {
+      return context_;
+    }
+  }
+
+
+  std::string OrthancConfiguration::GetPath(const std::string& key) const
+  {
+    if (path_.empty())
+    {
+      return key;
+    }
+    else
+    {
+      return path_ + "." + key;
+    }
+  }
+
+
+  void OrthancConfiguration::GetSection(OrthancConfiguration& target,
+                                        const std::string& key) const
+  {
+    assert(configuration_.type() == Json::objectValue);
+
+    target.context_ = context_;
+    target.path_ = GetPath(key);
+
+    if (!configuration_.isMember(key))
+    {
+      target.configuration_ = Json::objectValue;
+    }
+    else
+    {
+      if (configuration_[key].type() != Json::objectValue)
+      {
+        if (context_ != NULL)
+        {
+          std::string s = "The configuration section \"" + target.path_ + "\" is not an associative array as expected";
+          OrthancPluginLogError(context_, s.c_str());
+        }
+
+        throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+      }
+
+      target.configuration_ = configuration_[key];
+    }
+  }
+
+
+  bool OrthancConfiguration::LookupStringValue(std::string& target,
+                                               const std::string& key) const
+  {
+    assert(configuration_.type() == Json::objectValue);
+
+    if (!configuration_.isMember(key))
+    {
+      return false;
+    }
+
+    if (configuration_[key].type() != Json::stringValue)
+    {
+      if (context_ != NULL)
+      {
+        std::string s = "The configuration option \"" + GetPath(key) + "\" is not a string as expected";
+        OrthancPluginLogError(context_, s.c_str());
+      }
+
+      throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+
+    target = configuration_[key].asString();
+    return true;
+  }
+
+
+  bool OrthancConfiguration::LookupIntegerValue(int& target,
+                                                const std::string& key) const
+  {
+    assert(configuration_.type() == Json::objectValue);
+
+    if (!configuration_.isMember(key))
+    {
+      return false;
+    }
+
+    switch (configuration_[key].type())
+    {
+      case Json::intValue:
+        target = configuration_[key].asInt();
+        return true;
+
+      case Json::uintValue:
+        target = configuration_[key].asUInt();
+        return true;
+
+      default:
+        if (context_ != NULL)
+        {
+          std::string s = "The configuration option \"" + GetPath(key) + "\" is not an integer as expected";
+          OrthancPluginLogError(context_, s.c_str());
+        }
+
+        throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+  }
+
+
+  bool OrthancConfiguration::LookupUnsignedIntegerValue(unsigned int& target,
+                                                        const std::string& key) const
+  {
+    int tmp;
+    if (!LookupIntegerValue(tmp, key))
+    {
+      return false;
+    }
+
+    if (tmp < 0)
+    {
+      if (context_ != NULL)
+      {
+        std::string s = "The configuration option \"" + GetPath(key) + "\" is not a positive integer as expected";
+        OrthancPluginLogError(context_, s.c_str());
+      }
+
+      throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+    else
+    {
+      target = static_cast<unsigned int>(tmp);
+      return true;
+    }
+  }
+
+
+  bool OrthancConfiguration::LookupBooleanValue(bool& target,
+                                                const std::string& key) const
+  {
+    assert(configuration_.type() == Json::objectValue);
+
+    if (!configuration_.isMember(key))
+    {
+      return false;
+    }
+
+    if (configuration_[key].type() != Json::booleanValue)
+    {
+      if (context_ != NULL)
+      {
+        std::string s = "The configuration option \"" + GetPath(key) + "\" is not a Boolean as expected";
+        OrthancPluginLogError(context_, s.c_str());
+      }
+
+      throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+
+    target = configuration_[key].asBool();
+    return true;
+  }
+
+
+  bool OrthancConfiguration::LookupFloatValue(float& target,
+                                              const std::string& key) const
+  {
+    assert(configuration_.type() == Json::objectValue);
+
+    if (!configuration_.isMember(key))
+    {
+      return false;
+    }
+
+    switch (configuration_[key].type())
+    {
+      case Json::realValue:
+        target = configuration_[key].asFloat();
+        return true;
+
+      case Json::intValue:
+        target = configuration_[key].asInt();
+        return true;
+
+      case Json::uintValue:
+        target = configuration_[key].asUInt();
+        return true;
+
+      default:
+        if (context_ != NULL)
+        {
+          std::string s = "The configuration option \"" + GetPath(key) + "\" is not an integer as expected";
+          OrthancPluginLogError(context_, s.c_str());
+        }
+
+        throw PluginException(OrthancPluginErrorCode_BadFileFormat);
+    }
+  }
+
+
+  std::string OrthancConfiguration::GetStringValue(const std::string& key,
+                                                   const std::string& defaultValue) const
+  {
+    std::string tmp;
+    if (LookupStringValue(tmp, key))
+    {
+      return tmp;
+    }
+    else
+    {
+      return defaultValue;
+    }
+  }
+
+
+  int OrthancConfiguration::GetIntegerValue(const std::string& key,
+                                            int defaultValue) const
+  {
+    int tmp;
+    if (LookupIntegerValue(tmp, key))
+    {
+      return tmp;
+    }
+    else
+    {
+      return defaultValue;
+    }
+  }
+
+
+  unsigned int OrthancConfiguration::GetUnsignedIntegerValue(const std::string& key,
+                                                             unsigned int defaultValue) const
+  {
+    unsigned int tmp;
+    if (LookupUnsignedIntegerValue(tmp, key))
+    {
+      return tmp;
+    }
+    else
+    {
+      return defaultValue;
+    }
+  }
+
+
+  bool OrthancConfiguration::GetBooleanValue(const std::string& key,
+                                             bool defaultValue) const
+  {
+    bool tmp;
+    if (LookupBooleanValue(tmp, key))
+    {
+      return tmp;
+    }
+    else
+    {
+      return defaultValue;
+    }
+  }
+
+
+  float OrthancConfiguration::GetFloatValue(const std::string& key,
+                                            float defaultValue) const
+  {
+    float tmp;
+    if (LookupFloatValue(tmp, key))
+    {
+      return tmp;
+    }
+    else
+    {
+      return defaultValue;
+    }
+  }
+
+
+  void OrthancImage::Clear()
+  {
+    if (image_ != NULL)
+    {
+      OrthancPluginFreeImage(context_, image_);
+      image_ = NULL;
+    }
+  }
+
+
+  void OrthancImage::CheckImageAvailable()
+  {
+    if (image_ == NULL)
+    {
+      OrthancPluginLogError(context_, "Trying to access a NULL image");
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  OrthancImage::Image(OrthancPluginContext*  context) :
+    context_(context),
+    image_(NULL)
+  {
+    if (context == NULL)
+    {
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  OrthancImage::Image(OrthancPluginContext*  context,
+                      OrthancPluginImage*    image) :
+    context_(context),
+    image_(image)
+  {
+    if (context == NULL)
+    {
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  OrthancImage::Image(OrthancPluginContext*     context,
+                      OrthancPluginPixelFormat  format,
+                      uint32_t                  width,
+                      uint32_t                  height) :
+    context_(context)
+  {
+    if (context == NULL)
+    {
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+    else
+    {
+      image_ = OrthancPluginCreateImage(context, format, width, height);
+    }
+  }
+
+
+  void OrthancImage::UncompressPngImage(const void* data,
+                                        size_t size)
+  {
+    Clear();
+    image_ = OrthancPluginUncompressImage(context_, data, size, OrthancPluginImageFormat_Png);
+    if (image_ == NULL)
+    {
+      OrthancPluginLogError(context_, "Cannot uncompress a PNG image");
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  void OrthancImage::UncompressJpegImage(const void* data,
+                                         size_t size)
+  {
+    Clear();
+    image_ = OrthancPluginUncompressImage(context_, data, size, OrthancPluginImageFormat_Jpeg);
+    if (image_ == NULL)
+    {
+      OrthancPluginLogError(context_, "Cannot uncompress a JPEG image");
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  void OrthancImage::DecodeDicomImage(const void* data,
+                                      size_t size,
+                                      unsigned int frame)
+  {
+    Clear();
+    image_ = OrthancPluginDecodeDicomImage(context_, data, size, frame);
+    if (image_ == NULL)
+    {
+      OrthancPluginLogError(context_, "Cannot uncompress a DICOM image");
+      throw PluginException(OrthancPluginErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  OrthancPluginPixelFormat OrthancImage::GetPixelFormat()
+  {
+    CheckImageAvailable();
+    return OrthancPluginGetImagePixelFormat(context_, image_);
+  }
+
+
+  unsigned int OrthancImage::GetWidth()
+  {
+    CheckImageAvailable();
+    return OrthancPluginGetImageWidth(context_, image_);
+  }
+
+
+  unsigned int OrthancImage::GetHeight()
+  {
+    CheckImageAvailable();
+    return OrthancPluginGetImageHeight(context_, image_);
+  }
+
+
+  unsigned int OrthancImage::GetPitch()
+  {
+    CheckImageAvailable();
+    return OrthancPluginGetImagePitch(context_, image_);
+  }
+
+
+  const void* OrthancImage::GetBuffer()
+  {
+    CheckImageAvailable();
+    return OrthancPluginGetImageBuffer(context_, image_);
+  }
+
+
+  void OrthancImage::CompressPngImage(MemoryBuffer& target)
+  {
+    CheckImageAvailable();
+
+    OrthancPluginMemoryBuffer tmp;
+    OrthancPluginCompressPngImage(context_, &tmp, GetPixelFormat(),
+                                  GetWidth(), GetHeight(), GetPitch(), GetBuffer());
+
+    target.Assign(tmp);
+  }
+
+
+  void OrthancImage::CompressJpegImage(MemoryBuffer& target,
+                                       uint8_t quality)
+  {
+    CheckImageAvailable();
+
+    OrthancPluginMemoryBuffer tmp;
+    OrthancPluginCompressJpegImage(context_, &tmp, GetPixelFormat(),
+                                   GetWidth(), GetHeight(), GetPitch(), GetBuffer(), quality);
+
+    target.Assign(tmp);
+  }
+
+
+  void OrthancImage::AnswerPngImage(OrthancPluginRestOutput* output)
+  {
+    CheckImageAvailable();
+    OrthancPluginCompressAndAnswerPngImage(context_, output, GetPixelFormat(),
+                                           GetWidth(), GetHeight(), GetPitch(), GetBuffer());
+  }
+
+
+  void OrthancImage::AnswerJpegImage(OrthancPluginRestOutput* output,
+                                     uint8_t quality)
+  {
+    CheckImageAvailable();
+    OrthancPluginCompressAndAnswerJpegImage(context_, output, GetPixelFormat(),
+                                            GetWidth(), GetHeight(), GetPitch(), GetBuffer(), quality);
+  }
+
+
+  bool RestApiGetJson(Json::Value& result,
+                      OrthancPluginContext* context,
+                      const std::string& uri,
+                      bool applyPlugins)
+  {
+    MemoryBuffer answer(context);
+    if (!answer.RestApiGet(uri, applyPlugins))
+    {
+      return false;
+    }
+    else
+    {
+      answer.ToJson(result);
+      return true;
+    }
+  }
+
+
+  bool RestApiPostJson(Json::Value& result,
+                       OrthancPluginContext* context,
+                       const std::string& uri,
+                       const char* body,
+                       size_t bodySize,
+                       bool applyPlugins)
+  {
+    MemoryBuffer answer(context);
+    if (!answer.RestApiPost(uri, body, bodySize, applyPlugins))
+    {
+      return false;
+    }
+    else
+    {
+      answer.ToJson(result);
+      return true;
+    }
+  }
+
+
+  bool RestApiPutJson(Json::Value& result,
+                      OrthancPluginContext* context,
+                      const std::string& uri,
+                      const char* body,
+                      size_t bodySize,
+                      bool applyPlugins)
+  {
+    MemoryBuffer answer(context);
+    if (!answer.RestApiPut(uri, body, bodySize, applyPlugins))
+    {
+      return false;
+    }
+    else
+    {
+      answer.ToJson(result);
+      return true;
+    }
+  }
+
+
+  bool RestApiDelete(OrthancPluginContext* context,
+                     const std::string& uri,
+                     bool applyPlugins)
+  {
+    OrthancPluginErrorCode error;
+
+    if (applyPlugins)
+    {
+      error = OrthancPluginRestApiDeleteAfterPlugins(context, uri.c_str());
+    }
+    else
+    {
+      error = OrthancPluginRestApiDelete(context, uri.c_str());
+    }
+
+    if (error == OrthancPluginErrorCode_Success)
+    {
+      return true;
+    }
+    else if (error == OrthancPluginErrorCode_UnknownResource ||
+             error == OrthancPluginErrorCode_InexistentItem)
+    {
+      return false;
+    }
+    else
+    {
+      throw PluginException(error);
+    }
+  }
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugins/Samples/Common/OrthancPluginCppWrapper.h	Fri Jun 24 22:28:25 2016 +0200
@@ -0,0 +1,384 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital 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/>.
+ **/
+
+
+#pragma once
+
+#include <orthanc/OrthancCPlugin.h>
+#include <boost/noncopyable.hpp>
+#include <boost/lexical_cast.hpp>
+#include <json/value.h>
+
+#if HAS_ORTHANC_EXCEPTION == 1
+#  include <OrthancException.h>
+#endif
+
+
+namespace OrthancPlugins
+{
+  typedef void (*RestCallback) (OrthancPluginRestOutput* output,
+                                const char* url,
+                                const OrthancPluginHttpRequest* request);
+
+
+  class PluginException
+  {
+  private:
+    OrthancPluginErrorCode  code_;
+
+  public:
+    PluginException(OrthancPluginErrorCode code) : code_(code)
+    {
+    }
+
+    OrthancPluginErrorCode GetErrorCode() const
+    {
+      return code_;
+    }
+
+    const char* GetErrorDescription(OrthancPluginContext* context) const;
+  };
+
+
+  class MemoryBuffer : public boost::noncopyable
+  {
+  private:
+    OrthancPluginContext*      context_;
+    OrthancPluginMemoryBuffer  buffer_;
+
+  public:
+    MemoryBuffer(OrthancPluginContext* context);
+
+    ~MemoryBuffer()
+    {
+      Clear();
+    }
+
+    OrthancPluginMemoryBuffer* operator*()
+    {
+      return &buffer_;
+    }
+
+    // This transfers ownership
+    void Assign(OrthancPluginMemoryBuffer& other);
+
+    const char* GetData() const
+    {
+      if (buffer_.size > 0)
+      {
+        return reinterpret_cast<const char*>(buffer_.data);
+      }
+      else
+      {
+        return NULL;
+      }
+    }
+
+    size_t GetSize() const
+    {
+      return buffer_.size;
+    }
+
+    void Clear();
+
+    void ToString(std::string& target) const;
+
+    void ToJson(Json::Value& target) const;
+
+    bool RestApiGet(const std::string& uri,
+                    bool applyPlugins);
+
+    bool RestApiPost(const std::string& uri,
+                     const char* body,
+                     size_t bodySize,
+                     bool applyPlugins);
+
+    bool RestApiPut(const std::string& uri,
+                    const char* body,
+                    size_t bodySize,
+                    bool applyPlugins);
+
+    bool RestApiPost(const std::string& uri,
+                     const std::string& body,
+                     bool applyPlugins)
+    {
+      return RestApiPost(uri, body.empty() ? NULL : body.c_str(), body.size(), applyPlugins);
+    }
+
+    bool RestApiPut(const std::string& uri,
+                    const std::string& body,
+                    bool applyPlugins)
+    {
+      return RestApiPut(uri, body.empty() ? NULL : body.c_str(), body.size(), applyPlugins);
+    }
+  };
+
+
+  class OrthancString : public boost::noncopyable
+  {
+  private:
+    OrthancPluginContext*  context_;
+    char*                  str_;
+
+  public:
+    OrthancString(OrthancPluginContext* context,
+                  char* str);
+
+    ~OrthancString()
+    {
+      Clear();
+    }
+
+    void Clear();
+
+    const char* GetContent() const
+    {
+      return str_;
+    }
+
+    void ToString(std::string& target) const;
+
+    void ToJson(Json::Value& target) const;
+  };
+
+
+  class OrthancConfiguration : public boost::noncopyable
+  {
+  private:
+    OrthancPluginContext*  context_;
+    Json::Value            configuration_;
+    std::string            path_;
+
+    std::string GetPath(const std::string& key) const;
+
+  public:
+    OrthancConfiguration() : context_(NULL)
+    {
+    }
+
+    OrthancConfiguration(OrthancPluginContext* context);
+
+    OrthancPluginContext* GetContext() const;
+
+    const Json::Value& GetJson() const
+    {
+      return configuration_;
+    }
+
+    void GetSection(OrthancConfiguration& target,
+                    const std::string& key) const;
+
+    bool LookupStringValue(std::string& target,
+                           const std::string& key) const;
+
+    bool LookupIntegerValue(int& target,
+                            const std::string& key) const;
+
+    bool LookupUnsignedIntegerValue(unsigned int& target,
+                                    const std::string& key) const;
+
+    bool LookupBooleanValue(bool& target,
+                            const std::string& key) const;
+
+    bool LookupFloatValue(float& target,
+                          const std::string& key) const;
+
+    std::string GetStringValue(const std::string& key,
+                               const std::string& defaultValue) const;
+
+    int GetIntegerValue(const std::string& key,
+                        int defaultValue) const;
+
+    unsigned int GetUnsignedIntegerValue(const std::string& key,
+                                         unsigned int defaultValue) const;
+
+    bool GetBooleanValue(const std::string& key,
+                         bool defaultValue) const;
+
+    float GetFloatValue(const std::string& key,
+                        float defaultValue) const;
+  };
+
+  class OrthancImage
+  {
+  private:
+    OrthancPluginContext*  context_;
+    OrthancPluginImage*    image_;
+
+    void Clear();
+
+    void CheckImageAvailable();
+
+  public:
+    OrthancImage(OrthancPluginContext*  context);
+
+    OrthancImage(OrthancPluginContext*  context,
+                 OrthancPluginImage*    image);
+
+    OrthancImage(OrthancPluginContext*     context,
+                 OrthancPluginPixelFormat  format,
+                 uint32_t                  width,
+                 uint32_t                  height);
+
+    ~OrthancImage()
+    {
+      Clear();
+    }
+
+    void UncompressPngImage(const void* data,
+                            size_t size);
+
+    void UncompressJpegImage(const void* data,
+                             size_t size);
+
+    void DecodeDicomImage(const void* data,
+                          size_t size,
+                          unsigned int frame);
+
+    OrthancPluginPixelFormat GetPixelFormat();
+
+    unsigned int GetWidth();
+
+    unsigned int GetHeight();
+
+    unsigned int GetPitch();
+
+    const void* GetBuffer();
+
+    void CompressPngImage(MemoryBuffer& target);
+
+    void CompressJpegImage(MemoryBuffer& target,
+                           uint8_t quality);
+
+    void AnswerPngImage(OrthancPluginRestOutput* output);
+
+    void AnswerJpegImage(OrthancPluginRestOutput* output,
+                         uint8_t quality);
+  };
+
+
+  bool RestApiGetJson(Json::Value& result,
+                      OrthancPluginContext* context,
+                      const std::string& uri,
+                      bool applyPlugins);
+
+  bool RestApiPostJson(Json::Value& result,
+                       OrthancPluginContext* context,
+                       const std::string& uri,
+                       const char* body,
+                       size_t bodySize,
+                       bool applyPlugins);
+
+  bool RestApiPutJson(Json::Value& result,
+                      OrthancPluginContext* context,
+                      const std::string& uri,
+                      const char* body,
+                      size_t bodySize,
+                      bool applyPlugins);
+
+  inline bool RestApiPostJson(Json::Value& result,
+                              OrthancPluginContext* context,
+                              const std::string& uri,
+                              const std::string& body,
+                              bool applyPlugins)
+  {
+    return RestApiPostJson(result, context, uri, body.empty() ? NULL : body.c_str(),
+                           body.size(), applyPlugins);
+  }
+
+  bool RestApiDelete(OrthancPluginContext* context,
+                     const std::string& uri,
+                     bool applyPlugins);
+
+  inline bool RestApiPutJson(Json::Value& result,
+                             OrthancPluginContext* context,
+                             const std::string& uri,
+                             const std::string& body,
+                             bool applyPlugins)
+  {
+    return RestApiPutJson(result, context, uri, body.empty() ? NULL : body.c_str(),
+                          body.size(), applyPlugins);
+  }
+
+  bool RestApiDelete(OrthancPluginContext* context,
+                     const std::string& uri,
+                     bool applyPlugins);
+
+
+  namespace Internals
+  {
+    template <RestCallback Callback>
+    OrthancPluginErrorCode Protect(OrthancPluginRestOutput* output,
+                                   const char* url,
+                                   const OrthancPluginHttpRequest* request)
+    {
+      try
+      {
+        Callback(output, url, request);
+        return OrthancPluginErrorCode_Success;
+      }
+      catch (OrthancPlugins::PluginException& e)
+      {
+        return e.GetErrorCode();
+      }
+#if HAS_ORTHANC_EXCEPTION == 1
+      catch (Orthanc::OrthancException& e)
+      {
+        return static_cast<OrthancPluginErrorCode>(e.GetErrorCode());
+      }
+#endif
+      catch (boost::bad_lexical_cast& e)
+      {
+        return OrthancPluginErrorCode_BadFileFormat;
+      }
+      catch (...)
+      {
+        return OrthancPluginErrorCode_Plugin;
+      }
+    }
+  }
+
+
+  template <RestCallback Callback>
+  void RegisterRestCallback(OrthancPluginContext* context,
+                            const std::string& uri,
+                            bool isThreadSafe)
+  {
+    if (isThreadSafe)
+    {
+      OrthancPluginRegisterRestCallbackNoLock(context, uri.c_str(), Internals::Protect<Callback>);
+    }
+    else
+    {
+      OrthancPluginRegisterRestCallback(context, uri.c_str(), Internals::Protect<Callback>);
+    }
+  }
+}