--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Core/HttpServer/IHttpHandler.cpp	Mon Aug 10 17:18:36 2015 +0200
@@ -0,0 +1,104 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ * Copyright (C) 2012-2015 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 "../PrecompiledHeaders.h"
+#include "IHttpHandler.h"
+
+#include "../Toolbox.h"
+
+namespace Orthanc
+{
+  void IHttpHandler::GetAcceptedCompressions(std::set<HttpCompression>& result,
+                                             const Arguments& headers)
+  {
+    // Look if the client wishes HTTP compression
+    // https://en.wikipedia.org/wiki/HTTP_compression
+    Arguments::const_iterator it = headers.find("accept-encoding");
+    if (it != headers.end())
+    {
+      std::vector<std::string> encodings;
+      Toolbox::TokenizeString(encodings, it->second, ',');
+      for (size_t i = 0; i < encodings.size(); i++)
+      {
+        std::string s = Toolbox::StripSpaces(encodings[i]);
+
+        if (s == "deflate")
+        {
+          result.insert(HttpCompression_Deflate);
+        }
+        else if (s == "gzip")
+        {
+          result.insert(HttpCompression_Gzip);
+        }
+      }
+    }
+  }
+
+
+  HttpCompression IHttpHandler::GetPreferredCompression(const Arguments& headers,
+                                                        size_t bodySize)
+  {
+#if 0
+    // TODO
+    if (bodySize < 1024)
+    {
+      // Do not compress small answers
+      return HttpCompression_None;
+    }
+#endif
+
+    HttpCompression result = HttpCompression_None;
+
+    Arguments::const_iterator it = headers.find("accept-encoding");
+    if (it != headers.end())
+    {
+      std::vector<std::string> encodings;
+      Toolbox::TokenizeString(encodings, it->second, ',');
+      for (size_t i = 0; i < encodings.size(); i++)
+      {
+        std::string s = Toolbox::StripSpaces(encodings[i]);
+
+        if (s == "deflate" &&
+            result != HttpCompression_Gzip)  // Always prefer "gzip" over "deflate"
+        {
+          result = HttpCompression_Deflate;
+        }
+        else if (s == "gzip")
+        {
+          result = HttpCompression_Gzip;
+        }
+      }
+    }
+
+    return result;
+  }
+}