yuzu-android/src/core/file_sys/partition_filesystem.h

// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <string>
#include <vector>
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "common/swap.h"

namespace Loader {
enum class ResultStatus;
}

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:
    Loader::ResultStatus Load(const std::string& file_path, size_t offset = 0);
    Loader::ResultStatus Load(const std::vector<u8>& file_data, size_t offset = 0);

    u32 GetNumEntries() const;
    u64 GetEntryOffset(u32 index) const;
    u64 GetEntrySize(u32 index) const;
    std::string GetEntryName(u32 index) const;
    u64 GetFileOffset(const std::string& name) const;
    u64 GetFileSize(const std::string& name) const;

    void Print() const;

private:
    struct Header {
        std::array<char, 4> magic;
        u32_le num_entries;
        u32_le strtab_size;
        INSERT_PADDING_BYTES(0x4);
    };

    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)

    struct FileEntry {
        FSEntry fs_entry;
        std::string name;
    };

    Header pfs_header;
    bool is_hfs;
    size_t content_offset;

    std::vector<FileEntry> pfs_entries;
};

} // namespace FileSys