DiscIO: Add a blob reader for Volume files

Source/Core/DiscIO/CMakeLists.txt

@@ -15,6 +15,7 @@ set(SRCS
   NANDImporter.cpp
   TGCBlob.cpp
   Volume.cpp
+  VolumeFileBlobReader.cpp
   VolumeGC.cpp
   VolumeWad.cpp
   VolumeWii.cpp

Source/Core/DiscIO/DiscIO.vcxproj

@@ -51,6 +51,7 @@
     <ClCompile Include="NANDImporter.cpp" />
     <ClCompile Include="TGCBlob.cpp" />
     <ClCompile Include="Volume.cpp" />
+    <ClCompile Include="VolumeFileBlobReader.cpp" />
     <ClCompile Include="VolumeGC.cpp" />
     <ClCompile Include="VolumeWad.cpp" />
     <ClCompile Include="VolumeWii.cpp" />
@@ -73,6 +74,7 @@
     <ClInclude Include="NANDImporter.h" />
     <ClInclude Include="TGCBlob.h" />
     <ClInclude Include="Volume.h" />
+    <ClInclude Include="VolumeFileBlobReader.h" />
     <ClInclude Include="VolumeGC.h" />
     <ClInclude Include="VolumeWad.h" />
     <ClInclude Include="VolumeWii.h" />

Source/Core/DiscIO/DiscIO.vcxproj.filters

@@ -60,6 +60,9 @@
     <ClCompile Include="DirectoryBlob.cpp">
       <Filter>Volume\Blob</Filter>
     </ClCompile>
+    <ClCompile Include="VolumeFileBlobReader.cpp">
+      <Filter>Volume</Filter>
+    </ClCompile>
     <ClCompile Include="VolumeGC.cpp">
       <Filter>Volume</Filter>
     </ClCompile>
@@ -125,6 +128,9 @@
     <ClInclude Include="DirectoryBlob.h">
       <Filter>Volume\Blob</Filter>
     </ClInclude>
+    <ClInclude Include="VolumeFileBlobReader.h">
+      <Filter>Volume</Filter>
+    </ClInclude>
     <ClInclude Include="VolumeGC.h">
       <Filter>Volume</Filter>
     </ClInclude>

Source/Core/DiscIO/VolumeFileBlobReader.cpp

@@ -0,0 +1,51 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DiscIO/VolumeFileBlobReader.h"
+
+#include "DiscIO/Filesystem.h"
+#include "DiscIO/Volume.h"
+
+namespace DiscIO
+{
+std::unique_ptr<VolumeFileBlobReader> VolumeFileBlobReader::Create(const Volume& volume,
+                                                                   const FileSystem& file_system,
+                                                                   const std::string& file_path)
+{
+  if (!file_system.IsValid())
+    return nullptr;
+
+  std::unique_ptr<FileInfo> file_info = file_system.FindFileInfo(file_path);
+  if (!file_info || file_info->IsDirectory())
+    return nullptr;
+
+  return std::unique_ptr<VolumeFileBlobReader>{
+      new VolumeFileBlobReader(volume, file_system, std::move(file_info))};
+}
+
+VolumeFileBlobReader::VolumeFileBlobReader(const Volume& volume, const FileSystem& file_system,
+                                           std::unique_ptr<FileInfo> file_info)
+    : m_volume(volume), m_file_system(file_system), m_file_info(std::move(file_info))
+{
+}
+
+u64 VolumeFileBlobReader::GetDataSize() const
+{
+  return m_file_info->GetSize();
+}
+
+u64 VolumeFileBlobReader::GetRawSize() const
+{
+  return GetDataSize();
+}
+
+bool VolumeFileBlobReader::Read(u64 offset, u64 length, u8* out_ptr)
+{
+  if (offset + length > m_file_info->GetSize())
+    return false;
+
+  return m_volume.Read(m_file_info->GetOffset() + offset, length, out_ptr,
+                       m_file_system.GetPartition());
+}
+}  // namespace

Source/Core/DiscIO/VolumeFileBlobReader.h

@@ -0,0 +1,38 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "Common/CommonTypes.h"
+#include "DiscIO/Blob.h"
+
+namespace DiscIO
+{
+class FileInfo;
+class FileSystem;
+class Volume;
+
+class VolumeFileBlobReader final : public BlobReader
+{
+public:
+  static std::unique_ptr<VolumeFileBlobReader>
+  Create(const Volume& volume, const FileSystem& file_system, const std::string& file_path);
+
+  BlobType GetBlobType() const override { return BlobType::PLAIN; }
+  u64 GetDataSize() const override;
+  u64 GetRawSize() const override;
+  bool Read(u64 offset, u64 length, u8* out_ptr) override;
+
+private:
+  VolumeFileBlobReader(const Volume& volume, const FileSystem& file_system,
+                       std::unique_ptr<FileInfo> file_info);
+
+  const Volume& m_volume;
+  const FileSystem& m_file_system;
+  std::unique_ptr<FileInfo> m_file_info;
+};
+}  // namespace