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WIP/fs/partition_filesystem.h

@@ -0,0 +1,91 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+#include <string>
+#include <vector>
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "core/file_sys/vfs/vfs.h"
+
+namespace Loader {
+enum class ResultStatus : u16;
+}
+
+namespace FileSys {
+
+/**
+ * Helper which implements an interface to parse PFS/HFS filesystems.
+ * Data can either be loaded from a file path or data with an offset into it.
+ */
+class PartitionFilesystem : public ReadOnlyVfsDirectory {
+public:
+    explicit PartitionFilesystem(VirtualFile file);
+    ~PartitionFilesystem() override;
+
+    Loader::ResultStatus GetStatus() const;
+
+    std::map<std::string, u64> GetFileOffsets() const;
+    std::map<std::string, u64> GetFileSizes() const;
+
+    std::vector<VirtualFile> GetFiles() const override;
+    std::vector<VirtualDir> GetSubdirectories() const override;
+    std::string GetName() const override;
+    VirtualDir GetParentDirectory() const override;
+    void PrintDebugInfo() const;
+
+private:
+    struct Header {
+        u32_le magic;
+        u32_le num_entries;
+        u32_le strtab_size;
+        INSERT_PADDING_BYTES(0x4);
+
+        bool HasValidMagicValue() const;
+    };
+
+    static_assert(sizeof(Header) == 0x10, "PFS/HFS header structure size is wrong");
+
+#pragma pack(push, 1)
+    struct FSEntry {
+        u64_le offset;
+        u64_le size;
+        u32_le strtab_offset;
+    };
+
+    static_assert(sizeof(FSEntry) == 0x14, "FS entry structure size is wrong");
+
+    struct PFSEntry {
+        FSEntry fs_entry;
+        INSERT_PADDING_BYTES(0x4);
+    };
+
+    static_assert(sizeof(PFSEntry) == 0x18, "PFS entry structure size is wrong");
+
+    struct HFSEntry {
+        FSEntry fs_entry;
+        u32_le hash_region_size;
+        INSERT_PADDING_BYTES(0x8);
+        std::array<char, 0x20> hash;
+    };
+
+    static_assert(sizeof(HFSEntry) == 0x40, "HFS entry structure size is wrong");
+
+#pragma pack(pop)
+
+    Loader::ResultStatus status{};
+
+    Header pfs_header{};
+    bool is_hfs = false;
+    std::size_t content_offset = 0;
+
+    std::map<std::string, u64> offsets;
+    std::map<std::string, u64> sizes;
+
+    std::vector<VirtualFile> pfs_files;
+};
+
+} // namespace FileSys