[VFS] Add support for loading ZArchive files

src/xenia/vfs/devices/disc_zarchive_device.h

@@ -0,0 +1,56 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2020 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_VFS_DEVICES_DISC_ZARCHIVE_DEVICE_H_
+#define XENIA_VFS_DEVICES_DISC_ZARCHIVE_DEVICE_H_
+
+#include <memory>
+#include <string>
+
+#include "xenia/base/mapped_memory.h"
+#include "xenia/vfs/device.h"
+
+namespace xe {
+namespace vfs {
+
+class DiscZarchiveEntry;
+
+class DiscZarchiveDevice : public Device {
+ public:
+  DiscZarchiveDevice(const std::string_view mount_path,
+                     const std::filesystem::path& host_path);
+  ~DiscZarchiveDevice() override;
+
+  bool Initialize() override;
+  void Dump(StringBuffer* string_buffer) override;
+  Entry* ResolvePath(const std::string_view path) override;
+
+  const std::string& name() const override { return name_; }
+  uint32_t attributes() const override { return 0; }
+  uint32_t component_name_max_length() const override { return 255; }
+
+  uint32_t total_allocation_units() const override { return 128 * 1024; }
+  uint32_t available_allocation_units() const override { return 0; }
+  uint32_t sectors_per_allocation_unit() const override { return 1; }
+  uint32_t bytes_per_sector() const override { return 0x200; }
+
+ private:
+  bool ReadAllEntries(void* opaque, const std::string& path,
+                      DiscZarchiveEntry* node, DiscZarchiveEntry* parent);
+
+  std::string name_;
+  std::filesystem::path host_path_;
+  std::unique_ptr<Entry> root_entry_;
+  void* opaque_;
+};
+
+}  // namespace vfs
+}  // namespace xe
+
+#endif  // XENIA_VFS_DEVICES_DISC_ZARCHIVE_DEVICE_H_