forked from dolphin-emu/dolphin
5e3c98af1d
This is a fairly common operation, so let's make a utility function for it to cut down on code duplication.
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include <cstddef>
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#include <map>
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#include <memory>
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#include <optional>
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#include <string>
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#include <vector>
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#include "Common/CommonTypes.h"
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#include "DiscIO/Filesystem.h"
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namespace DiscIO
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{
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class Volume;
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struct Partition;
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class FileInfoGCWii : public FileInfo
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{
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public:
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// None of the constructors take ownership of FST pointers
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// Set everything manually
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FileInfoGCWii(const u8* fst, u8 offset_shift, u32 index, u32 total_file_infos);
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// For the root object only
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FileInfoGCWii(const u8* fst, u8 offset_shift);
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// Copy another object
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FileInfoGCWii(const FileInfoGCWii& file_info) = default;
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// Copy data that is common to the whole file system
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FileInfoGCWii(const FileInfoGCWii& file_info, u32 index);
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~FileInfoGCWii() override;
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std::unique_ptr<FileInfo> clone() const override;
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const_iterator begin() const override;
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const_iterator end() const override;
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u64 GetOffset() const override;
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u32 GetSize() const override;
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bool IsDirectory() const override;
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u32 GetTotalChildren() const override;
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std::string GetName() const override;
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std::string GetPath() const override;
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bool IsValid(u64 fst_size, const FileInfoGCWii& parent_directory) const;
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protected:
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uintptr_t GetAddress() const override;
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FileInfo& operator++() override;
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private:
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enum class EntryProperty
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{
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// NAME_OFFSET's lower 3 bytes are the name's offset within the name table.
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// NAME_OFFSET's upper 1 byte is 1 for directories and 0 for files.
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NAME_OFFSET = 0,
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// For files, FILE_OFFSET is the file offset in the partition,
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// and for directories, it's the FST index of the parent directory.
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// The root directory has its parent directory index set to 0.
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FILE_OFFSET = 1,
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// For files, FILE_SIZE is the file size, and for directories,
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// it's the FST index of the next entry that isn't in the directory.
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FILE_SIZE = 2
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};
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// For files, returns the index of the next item. For directories,
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// returns the index of the next item that isn't inside it.
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u32 GetNextIndex() const;
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// Returns one of the three properties of this FST entry.
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// Read the comments in EntryProperty for details.
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u32 Get(EntryProperty entry_property) const;
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// Returns the name offset, excluding the directory identification byte
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u64 GetNameOffset() const;
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const u8* m_fst;
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u8 m_offset_shift;
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u32 m_index;
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u32 m_total_file_infos;
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};
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class FileSystemGCWii : public FileSystem
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{
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public:
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FileSystemGCWii(const Volume* volume, const Partition& partition);
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~FileSystemGCWii() override;
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bool IsValid() const override { return m_valid; }
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const FileInfo& GetRoot() const override;
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std::unique_ptr<FileInfo> FindFileInfo(const std::string& path) const override;
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std::unique_ptr<FileInfo> FindFileInfo(u64 disc_offset) const override;
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private:
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bool m_valid;
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std::vector<u8> m_file_system_table;
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FileInfoGCWii m_root;
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// Maps the end offset of files to FST indexes
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mutable std::map<u64, u32> m_offset_file_info_cache;
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std::unique_ptr<FileInfo> FindFileInfo(const std::string& path, const FileInfo& file_info) const;
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};
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} // namespace
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