--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Core/Images/JpegReader.cpp	Fri Sep 04 16:36:18 2015 +0200
@@ -0,0 +1,184 @@
+/**
+ * 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 "JpegReader.h"
+
+#include "JpegErrorManager.h"
+#include "../OrthancException.h"
+#include "../Logging.h"
+
+namespace Orthanc
+{
+  static void Uncompress(struct jpeg_decompress_struct& cinfo,
+                         std::string& content,
+                         ImageAccessor& accessor)
+  {
+    jpeg_read_header(&cinfo, TRUE);
+    jpeg_start_decompress(&cinfo);
+
+    PixelFormat format;
+    if (cinfo.output_components == 1 &&
+        cinfo.out_color_space == JCS_GRAYSCALE)
+    {
+      format = PixelFormat_Grayscale8;
+    }
+    else if (cinfo.output_components == 3 &&
+             cinfo.out_color_space == JCS_RGB)
+    {
+      format = PixelFormat_RGB24;
+    }
+    else
+    {
+      throw OrthancException(ErrorCode_NotImplemented);
+    }
+
+    unsigned int pitch = cinfo.output_width * cinfo.output_components;
+
+    /* Make a one-row-high sample array that will go away when done with image */
+    JSAMPARRAY buffer = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, pitch, 1);
+
+    try
+    {
+      content.resize(pitch * cinfo.output_height);
+    }
+    catch (...)
+    {
+      throw OrthancException(ErrorCode_NotEnoughMemory);
+    }
+
+    accessor.AssignWritable(format, cinfo.output_width, cinfo.output_height, pitch, 
+                            content.empty() ? NULL : &content[0]);
+
+    uint8_t* target = reinterpret_cast<uint8_t*>(&content[0]);
+    while (cinfo.output_scanline < cinfo.output_height) 
+    {
+      jpeg_read_scanlines(&cinfo, buffer, 1);
+      memcpy(target, buffer[0], pitch);
+      target += pitch;
+    }
+
+    // Everything went fine, "setjmp()" didn't get called
+
+    jpeg_finish_decompress(&cinfo);
+  }
+
+
+  void JpegReader::ReadFromFile(const char* filename)
+  {
+    FILE* fp = fopen(filename, "rb");
+    if (!fp)
+    {
+      throw OrthancException(ErrorCode_InexistentFile);
+    }
+
+    struct jpeg_decompress_struct cinfo;
+    memset(&cinfo, 0, sizeof(struct jpeg_decompress_struct));
+
+    Internals::JpegErrorManager jerr;
+    cinfo.err = jerr.GetPublic();
+    
+    if (setjmp(jerr.GetJumpBuffer())) 
+    {
+      jpeg_destroy_decompress(&cinfo);
+      fclose(fp);
+      LOG(ERROR) << "Error during JPEG encoding: " << jerr.GetMessage();
+      throw OrthancException(ErrorCode_InternalError);
+    }
+
+    // Below this line, we are under the scope of a "setjmp"
+
+    jpeg_create_decompress(&cinfo);
+    jpeg_stdio_src(&cinfo, fp);
+
+    try
+    {
+      Uncompress(cinfo, content_, *this);
+    }
+    catch (OrthancException&)
+    {
+      jpeg_destroy_decompress(&cinfo);
+      fclose(fp);
+      throw;
+    }
+
+    jpeg_destroy_decompress(&cinfo);
+    fclose(fp);
+  }
+
+
+  void JpegReader::ReadFromMemory(const void* buffer,
+                                  size_t size)
+  {
+    struct jpeg_decompress_struct cinfo;
+    memset(&cinfo, 0, sizeof(struct jpeg_decompress_struct));
+
+    Internals::JpegErrorManager jerr;
+    cinfo.err = jerr.GetPublic();
+    
+    if (setjmp(jerr.GetJumpBuffer())) 
+    {
+      jpeg_destroy_decompress(&cinfo);
+      LOG(ERROR) << "Error during JPEG encoding: " << jerr.GetMessage();
+      throw OrthancException(ErrorCode_InternalError);
+    }
+
+    // Below this line, we are under the scope of a "setjmp"
+    jpeg_create_decompress(&cinfo);
+    jpeg_mem_src(&cinfo, const_cast<unsigned char*>(reinterpret_cast<const unsigned char*>(buffer)), size);
+
+    try
+    {
+      Uncompress(cinfo, content_, *this);
+    }
+    catch (OrthancException&)
+    {
+      jpeg_destroy_decompress(&cinfo);
+      throw;
+    }
+
+    jpeg_destroy_decompress(&cinfo);
+  }
+
+
+  void JpegReader::ReadFromMemory(const std::string& buffer)
+  {
+    if (buffer.empty())
+    {
+      ReadFromMemory(NULL, 0);
+    }
+    else
+    {
+      ReadFromMemory(buffer.c_str(), buffer.size());
+    }
+  }
+}