--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Oracle/GetOrthancImageCommand.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,189 @@
+/**
+ * Stone of Orthanc
+ * 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 Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "GetOrthancImageCommand.h"
+
+#include <Images/JpegReader.h>
+#include <Images/PamReader.h>
+#include <Images/PngReader.h>
+#include <OrthancException.h>
+#include <Toolbox.h>
+
+namespace OrthancStone
+{
+  GetOrthancImageCommand::GetOrthancImageCommand() :
+    uri_("/"),
+    timeout_(600),
+    hasExpectedFormat_(false)
+  {
+  }
+
+
+  void GetOrthancImageCommand::SetExpectedPixelFormat(Orthanc::PixelFormat format)
+  {
+    hasExpectedFormat_ = true;
+    expectedFormat_ = format;
+  }
+
+
+  static std::string GetFormatSuffix(Orthanc::PixelFormat pixelFormat)
+  {
+    switch (pixelFormat)
+    {
+      case Orthanc::PixelFormat_RGB24:
+        return "preview";
+      
+      case Orthanc::PixelFormat_Grayscale16:
+        return "image-uint16";
+      
+      case Orthanc::PixelFormat_SignedGrayscale16:
+        return "image-int16";
+      
+      default:
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+  }
+
+
+  void GetOrthancImageCommand::SetInstanceUri(const std::string& instance,
+                                              Orthanc::PixelFormat pixelFormat)
+  {
+    uri_ = "/instances/" + instance + "/" + GetFormatSuffix(pixelFormat);
+  }
+
+
+  void GetOrthancImageCommand::SetFrameUri(const std::string& instance,
+                                           unsigned int frame,
+                                           Orthanc::PixelFormat pixelFormat)
+  {
+    uri_ = ("/instances/" + instance + "/frames/" +
+            boost::lexical_cast<std::string>(frame) + "/" + GetFormatSuffix(pixelFormat));
+  }
+
+
+  void GetOrthancImageCommand::ProcessHttpAnswer(boost::weak_ptr<IObserver> receiver,
+                                                 IMessageEmitter& emitter,
+                                                 const std::string& answer,
+                                                 const HttpHeaders& answerHeaders) const
+  {
+    for (HttpHeaders::const_iterator it = answerHeaders.begin(); it != answerHeaders.end(); ++it)
+    {
+      std::string key = Orthanc::Toolbox::StripSpaces(it->first);
+      Orthanc::Toolbox::ToLowerCase(key);
+        
+      if (key == "content-disposition" &&
+          it->second == "filename=\"unsupported.png\"")
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat,
+                                        "Orthanc cannot decode this image");
+      }
+    }
+    
+    Orthanc::MimeType contentType = Orthanc::MimeType_Binary;
+
+    for (HttpHeaders::const_iterator it = answerHeaders.begin(); 
+         it != answerHeaders.end(); ++it)
+    {
+      std::string s;
+      Orthanc::Toolbox::ToLowerCase(s, it->first);
+
+      if (s == "content-type")
+      {
+        contentType = Orthanc::StringToMimeType(it->second);
+        break;
+      }
+    }
+
+    std::unique_ptr<Orthanc::ImageAccessor> image;
+
+    switch (contentType)
+    {
+      case Orthanc::MimeType_Png:
+      {
+        image.reset(new Orthanc::PngReader);
+        dynamic_cast<Orthanc::PngReader&>(*image).ReadFromMemory(answer);
+        break;
+      }
+
+      case Orthanc::MimeType_Pam:
+      {
+#ifdef __EMSCRIPTEN__
+        // "true" means we ask the PamReader to make an extra copy so that
+        // the resulting Orthanc::ImageAccessor is aligned (as malloc is).
+        // Indeed, even though alignment is not required in Web Assembly,
+        // Emscripten seems to check it and bail out if addresses are "odd"
+        image.reset(new Orthanc::PamReader(true));
+#else
+        // potentially unaligned, with is faster and consumes less heap memory
+        image.reset(new Orthanc::PamReader);
+#endif
+        dynamic_cast<Orthanc::PamReader&>(*image).ReadFromMemory(answer);
+        break;
+      }
+
+      case Orthanc::MimeType_Jpeg:
+      {
+        image.reset(new Orthanc::JpegReader);
+        dynamic_cast<Orthanc::JpegReader&>(*image).ReadFromMemory(answer);
+        break;
+      }
+
+      default:
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_NetworkProtocol,
+                                        "Unsupported HTTP Content-Type for an image: " + 
+                                        std::string(Orthanc::EnumerationToString(contentType)));
+    }
+
+    if (hasExpectedFormat_)
+    {
+      if (expectedFormat_ == Orthanc::PixelFormat_SignedGrayscale16 &&
+          image->GetFormat() == Orthanc::PixelFormat_Grayscale16)
+      {
+        image->SetFormat(Orthanc::PixelFormat_SignedGrayscale16);
+      }
+
+      if (expectedFormat_ != image->GetFormat())
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
+      }
+    }
+
+    //{
+    //  // DEBUG DISPLAY IMAGE PROPERTIES BGO 2020-04-11
+    //  const Orthanc::ImageAccessor& source = *image;
+    //  const void* sourceBuffer = source.GetConstBuffer();
+    //  intptr_t sourceBufferInt = reinterpret_cast<intptr_t>(sourceBuffer);
+    //  int sourceWidth = source.GetWidth();
+    //  int sourceHeight = source.GetHeight();
+    //  int sourcePitch = source.GetPitch();
+
+    //  // TODO: turn error into trace below
+    //  LOG(ERROR) << "GetOrthancImageCommand::ProcessHttpAnswer | source:"
+    //    << " W = " << sourceWidth << " H = " << sourceHeight
+    //    << " P = " << sourcePitch << " B = " << sourceBufferInt
+    //    << " B % 4 == " << sourceBufferInt % 4;
+    //}
+
+
+    SuccessMessage message(*this, *image, contentType);
+    emitter.EmitMessage(receiver, message);
+  }
+}