--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/HttpServer/HttpStreamTranscoder.h	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,94 @@
+/**
+ * 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/>.
+ **/
+
+
+#pragma once
+
+#include "BufferHttpSender.h"
+
+#include "../Compatibility.h"
+
+#include <memory>  // For std::unique_ptr
+
+namespace Orthanc
+{
+  class ORTHANC_PUBLIC HttpStreamTranscoder : public IHttpStreamAnswer
+  {
+  private:
+    IHttpStreamAnswer& source_;
+    CompressionType    sourceCompression_;
+    uint64_t           bytesToSkip_;
+    uint64_t           skipped_;
+    uint64_t           currentChunkOffset_;
+    bool               ready_;
+
+    std::unique_ptr<BufferHttpSender>  uncompressed_;
+
+    void ReadSource(std::string& buffer);
+
+    HttpCompression SetupZlibCompression(bool deflateAllowed);
+
+  public:
+    HttpStreamTranscoder(IHttpStreamAnswer& source,
+                         CompressionType compression) : 
+      source_(source),
+      sourceCompression_(compression),
+      bytesToSkip_(0),
+      skipped_(0),
+      currentChunkOffset_(0),
+      ready_(false)
+    {
+    }
+
+    // This is the first method to be called
+    virtual HttpCompression SetupHttpCompression(bool gzipAllowed,
+                                                 bool deflateAllowed);
+
+    virtual bool HasContentFilename(std::string& filename)
+    {
+      return source_.HasContentFilename(filename);
+    }
+
+    virtual std::string GetContentType()
+    {
+      return source_.GetContentType();
+    }
+
+    virtual uint64_t GetContentLength();
+
+    virtual bool ReadNextChunk();
+
+    virtual const char* GetChunkContent();
+
+    virtual size_t GetChunkSize();
+  };
+}