Separation of STFS, SVOD into different entities

src/xenia/vfs/devices/xcontent_devices/svod_container_device.h

@@ -0,0 +1,77 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2023 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_VFS_DEVICES_XCONTENT_DEVICES_SVOD_CONTAINER_DEVICE_H_
+#define XENIA_VFS_DEVICES_XCONTENT_DEVICES_SVOD_CONTAINER_DEVICE_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include "xenia/base/string_util.h"
+#include "xenia/kernel/util/xex2_info.h"
+#include "xenia/vfs/device.h"
+#include "xenia/vfs/devices/stfs_xbox.h"
+#include "xenia/vfs/devices/xcontent_container_device.h"
+#include "xenia/vfs/devices/xcontent_container_entry.h"
+
+namespace xe {
+namespace vfs {
+class SvodContainerDevice : public XContentContainerDevice {
+ public:
+  SvodContainerDevice(const std::string_view mount_path,
+                      const std::filesystem::path& host_path);
+  ~SvodContainerDevice() override;
+
+  bool is_read_only() const override { return true; }
+
+  uint32_t component_name_max_length() const override { return 255; }
+
+  uint32_t total_allocation_units() const override {
+    return uint32_t(data_size() / sectors_per_allocation_unit() /
+                    bytes_per_sector());
+  }
+  uint32_t available_allocation_units() const override { return 0; }
+
+ private:
+  enum class SvodLayoutType {
+    kUnknown = 0x0,
+    kEnhancedGDF = 0x1,
+    kXSF = 0x2,
+    kSingleFile = 0x4,
+  };
+  const char* MEDIA_MAGIC = "MICROSOFT*XBOX*MEDIA";
+
+  Result LoadHostFiles(FILE* header_file) override;
+
+  Result Read() override;
+  Result ReadEntry(uint32_t sector, uint32_t ordinal,
+                  XContentContainerEntry* parent);
+  void BlockToOffset(size_t sector, size_t* address, size_t* file_index) const;
+
+  Result SetLayout(FILE* header, size_t& magic_offset);
+  Result SetEDGFLayout(FILE* header, size_t& magic_offset);
+  Result SetXSFLayout(FILE* header, size_t& magic_offset);
+  Result SetNormalLayout(FILE* header, size_t& magic_offset);
+
+  const bool IsEDGFLayout() const {
+    return header_->content_metadata.volume_descriptor.svod.features.bits
+        .enhanced_gdf_layout;
+  }
+  const bool IsXSFLayout(FILE* header) const;
+
+  size_t svod_base_offset_;
+  SvodLayoutType svod_layout_;
+};
+
+}  // namespace vfs
+}  // namespace xe
+
+#endif  // XENIA_VFS_DEVICES_XCONTENT_DEVICES_SVOD_CONTAINER_DEVICE_H_