--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/FileStorage/FilesystemStorage.cpp	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,274 @@
+/**
+ * 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/>.
+ **/
+
+
+#include "../PrecompiledHeaders.h"
+#include "FilesystemStorage.h"
+
+// http://stackoverflow.com/questions/1576272/storing-large-number-of-files-in-file-system
+// http://stackoverflow.com/questions/446358/storing-a-large-number-of-images
+
+#include "../Logging.h"
+#include "../OrthancException.h"
+#include "../Toolbox.h"
+#include "../SystemToolbox.h"
+
+#include <boost/filesystem/fstream.hpp>
+
+
+static std::string ToString(const boost::filesystem::path& p)
+{
+#if BOOST_HAS_FILESYSTEM_V3 == 1
+  return p.filename().string();
+#else
+  return p.filename();
+#endif
+}
+
+
+namespace Orthanc
+{
+  boost::filesystem::path FilesystemStorage::GetPath(const std::string& uuid) const
+  {
+    namespace fs = boost::filesystem;
+
+    if (!Toolbox::IsUuid(uuid))
+    {
+      throw OrthancException(ErrorCode_ParameterOutOfRange);
+    }
+
+    fs::path path = root_;
+
+    path /= std::string(&uuid[0], &uuid[2]);
+    path /= std::string(&uuid[2], &uuid[4]);
+    path /= uuid;
+
+#if BOOST_HAS_FILESYSTEM_V3 == 1
+    path.make_preferred();
+#endif
+
+    return path;
+  }
+
+  FilesystemStorage::FilesystemStorage(std::string root)
+  {
+    //root_ = boost::filesystem::absolute(root).string();
+    root_ = root;
+
+    SystemToolbox::MakeDirectory(root);
+  }
+
+
+
+  static const char* GetDescriptionInternal(FileContentType content)
+  {
+    // This function is for logging only (internal use), a more
+    // fully-featured version is available in ServerEnumerations.cpp
+    switch (content)
+    {
+      case FileContentType_Unknown:
+        return "Unknown";
+
+      case FileContentType_Dicom:
+        return "DICOM";
+
+      case FileContentType_DicomAsJson:
+        return "JSON summary of DICOM";
+
+      default:
+        return "User-defined";
+    }
+  }
+
+
+  void FilesystemStorage::Create(const std::string& uuid,
+                                 const void* content, 
+                                 size_t size,
+                                 FileContentType type)
+  {
+    LOG(INFO) << "Creating attachment \"" << uuid << "\" of \"" << GetDescriptionInternal(type) 
+              << "\" type (size: " << (size / (1024 * 1024) + 1) << "MB)";
+
+    boost::filesystem::path path;
+    
+    path = GetPath(uuid);
+
+    if (boost::filesystem::exists(path))
+    {
+      // Extremely unlikely case: This Uuid has already been created
+      // in the past.
+      throw OrthancException(ErrorCode_InternalError);
+    }
+
+    if (boost::filesystem::exists(path.parent_path()))
+    {
+      if (!boost::filesystem::is_directory(path.parent_path()))
+      {
+        throw OrthancException(ErrorCode_DirectoryOverFile);
+      }
+    }
+    else
+    {
+      if (!boost::filesystem::create_directories(path.parent_path()))
+      {
+        throw OrthancException(ErrorCode_FileStorageCannotWrite);
+      }
+    }
+
+    SystemToolbox::WriteFile(content, size, path.string());
+  }
+
+
+  void FilesystemStorage::Read(std::string& content,
+                               const std::string& uuid,
+                               FileContentType type)
+  {
+    LOG(INFO) << "Reading attachment \"" << uuid << "\" of \"" << GetDescriptionInternal(type) 
+              << "\" content type";
+
+    content.clear();
+    SystemToolbox::ReadFile(content, GetPath(uuid).string());
+  }
+
+
+  uintmax_t FilesystemStorage::GetSize(const std::string& uuid) const
+  {
+    boost::filesystem::path path = GetPath(uuid);
+    return boost::filesystem::file_size(path);
+  }
+
+
+
+  void FilesystemStorage::ListAllFiles(std::set<std::string>& result) const
+  {
+    namespace fs = boost::filesystem;
+
+    result.clear();
+
+    if (fs::exists(root_) && fs::is_directory(root_))
+    {
+      for (fs::recursive_directory_iterator current(root_), end; current != end ; ++current)
+      {
+        if (SystemToolbox::IsRegularFile(current->path().string()))
+        {
+          try
+          {
+            fs::path d = current->path();
+            std::string uuid = ToString(d);
+            if (Toolbox::IsUuid(uuid))
+            {
+              fs::path p0 = d.parent_path().parent_path().parent_path();
+              std::string p1 = ToString(d.parent_path().parent_path());
+              std::string p2 = ToString(d.parent_path());
+              if (p1.length() == 2 &&
+                  p2.length() == 2 &&
+                  p1 == uuid.substr(0, 2) &&
+                  p2 == uuid.substr(2, 2) &&
+                  p0 == root_)
+              {
+                result.insert(uuid);
+              }
+            }
+          }
+          catch (fs::filesystem_error&)
+          {
+          }
+        }
+      }
+    }
+  }
+
+
+  void FilesystemStorage::Clear()
+  {
+    namespace fs = boost::filesystem;
+    typedef std::set<std::string> List;
+
+    List result;
+    ListAllFiles(result);
+
+    for (List::const_iterator it = result.begin(); it != result.end(); ++it)
+    {
+      Remove(*it, FileContentType_Unknown /*ignored in this class*/);
+    }
+  }
+
+
+  void FilesystemStorage::Remove(const std::string& uuid,
+                                 FileContentType type)
+  {
+    LOG(INFO) << "Deleting attachment \"" << uuid << "\" of type " << static_cast<int>(type);
+
+    namespace fs = boost::filesystem;
+
+    fs::path p = GetPath(uuid);
+
+    try
+    {
+      fs::remove(p);
+    }
+    catch (...)
+    {
+      // Ignore the error
+    }
+
+    // Remove the two parent directories, ignoring the error code if
+    // these directories are not empty
+
+    try
+    {
+#if BOOST_HAS_FILESYSTEM_V3 == 1
+      boost::system::error_code err;
+      fs::remove(p.parent_path(), err);
+      fs::remove(p.parent_path().parent_path(), err);
+#else
+      fs::remove(p.parent_path());
+      fs::remove(p.parent_path().parent_path());
+#endif
+    }
+    catch (...)
+    {
+      // Ignore the error
+    }
+  }
+
+
+  uintmax_t FilesystemStorage::GetCapacity() const
+  {
+    return boost::filesystem::space(root_).capacity;
+  }
+
+  uintmax_t FilesystemStorage::GetAvailableSpace() const
+  {
+    return boost::filesystem::space(root_).available;
+  }
+}