datafile.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef ENGINE_SHARED_DATAFILE_H
#define ENGINE_SHARED_DATAFILE_H
 
#include <engine/storage.h>
 
#include <base/hash.h>
#include <base/types.h>
 
#include "uuid_manager.h"
 
#include <cstdint>
#include <map>
#include <vector>
 
enum
{
    ITEMTYPE_EX = 0xFFFF,
};
 
// raw datafile access
class CDataFileReader
{
    class CDatafile *m_pDataFile = nullptr;
 
    int GetExternalItemType(int InternalType, CUuid *pUuid);
    int GetInternalItemType(int ExternalType);
 
public:
    ~CDataFileReader();
    CDataFileReader &operator=(CDataFileReader &&Other);
 
    [[nodiscard]] bool Open(class IStorage *pStorage, const char *pFilename, int StorageType);
    void Close();
    bool IsOpen() const;
    IOHANDLE File() const;
 
    int GetDataSize(int Index) const;
    void *GetData(int Index);
    void *GetDataSwapped(int Index); // makes sure that the data is 32bit LE ints when saved
    const char *GetDataString(int Index);
    void ReplaceData(int Index, char *pData, size_t Size); // memory for data must have been allocated with malloc
    void UnloadData(int Index);
    int NumData() const;
 
    int GetItemSize(int Index) const;
    void *GetItem(int Index, int *pType = nullptr, int *pId = nullptr, CUuid *pUuid = nullptr);
    void GetType(int Type, int *pStart, int *pNum);
    int FindItemIndex(int Type, int Id);
    void *FindItem(int Type, int Id);
    int NumItems() const;
 
    SHA256_DIGEST Sha256() const;
    unsigned Crc() const;
    int MapSize() const;
};
 
// write access
class CDataFileWriter
{
public:
    enum ECompressionLevel
    {
        COMPRESSION_DEFAULT,
        COMPRESSION_BEST,
    };
 
private:
    class CDataInfo
    {
    public:
        void *m_pUncompressedData;
        int m_UncompressedSize;
        void *m_pCompressedData;
        int m_CompressedSize;
        ECompressionLevel m_CompressionLevel;
    };
 
    class CItemInfo
    {
    public:
        int m_Type;
        int m_Id;
        int m_Size;
        int m_Next;
        int m_Prev;
        void *m_pData;
    };
 
    class CItemTypeInfo
    {
    public:
        int m_Num = 0;
        int m_First = -1;
        int m_Last = -1;
    };
 
    class CExtendedItemType
    {
    public:
        int m_Type;
        CUuid m_Uuid;
    };
 
    IOHANDLE m_File;
    std::map<uint16_t, CItemTypeInfo, std::less<>> m_ItemTypes; // item types must be sorted in ascending order
    std::vector<CItemInfo> m_vItems;
    std::vector<CDataInfo> m_vDatas;
    std::vector<CExtendedItemType> m_vExtendedItemTypes;
 
    int GetTypeFromIndex(int Index) const;
    int GetExtendedItemTypeIndex(int Type, const CUuid *pUuid);
 
public:
    CDataFileWriter();
    CDataFileWriter(CDataFileWriter &&Other)
    {
        m_File = Other.m_File;
        Other.m_File = nullptr;
        m_ItemTypes = std::move(Other.m_ItemTypes);
        m_vItems = std::move(Other.m_vItems);
        m_vDatas = std::move(Other.m_vDatas);
        m_vExtendedItemTypes = std::move(Other.m_vExtendedItemTypes);
    }
    ~CDataFileWriter();
 
    [[nodiscard]] bool Open(class IStorage *pStorage, const char *pFilename, int StorageType = IStorage::TYPE_SAVE);
    int AddItem(int Type, int Id, size_t Size, const void *pData, const CUuid *pUuid = nullptr);
    int AddData(size_t Size, const void *pData, ECompressionLevel CompressionLevel = COMPRESSION_DEFAULT);
    int AddDataSwapped(size_t Size, const void *pData);
    int AddDataString(const char *pStr);
    void Finish();
};
 
#endif