TCompress.h

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#pragma once
#include "Toshi/TVersion.h"
#include "File/TFile.h"
 
TOSHI_NAMESPACE_START
 
enum TCOMPRESS_ERROR
{
    TCOMPRESS_ERROR_OK               = 0,
    TCOMPRESS_ERROR_WRONG_MAGIC      = -1,
    TCOMPRESS_ERROR_WRONG_VERSION    = -2,
    TCOMPRESS_ERROR_WRONG_SIZE       = -3,
    TCOMPRESS_ERROR_WRONG_HEADERSIZE = -4
};
 
enum BTECSizeFlag
{
    BTECSizeFlag_BigSize  = BITFLAG( 6 ),
    BTECSizeFlag_NoOffset = BITFLAG( 7 ),
    BTECSizeFlag_SizeMask = BTECSizeFlag_BigSize - 1,
};
 
enum BTECOffsetFlag
{
    BTECOffsetFlag_BigOffset  = BITFLAG( 7 ),
    BTECOffsetFlag_OffsetMask = BTECOffsetFlag_BigOffset - 1,
};
 
class TCompress
{
public:
    //-----------------------------------------------------------------------------
    // General Information
    //-----------------------------------------------------------------------------
 
    struct Header
    {
        TUINT32  Magic;
        TVersion Version;
        TUINT32  CompressedSize;
        TUINT32  Size;
        TUINT32  XorValue;
    };
 
    // Size of header that is common for any BTEC version
    static constexpr TUINT32 HEADER_SIZE_12 = sizeof( Header ) - sizeof( Header::XorValue );
 
    // Size of header that is common for BTEC 1.3
    static constexpr TUINT32 HEADER_SIZE_13 = sizeof( Header );
 
    // Custom variable used to help the compressor/decompressor decide which byte order it should use
    inline static TBOOL ms_bIsBigEndian = TFALSE;
 
public:
    //-----------------------------------------------------------------------------
    // Compressor
    //-----------------------------------------------------------------------------
 
    static constexpr TINT maxlength = 0x4000;
    static TINT           usemaxoffset;
 
public:
    static size_t Compress( TFile* file, TBYTE* data, TUINT32 size, TUINT32 unused, TBOOL isBigEndian );
 
private:
    static TINT WriteOffset( TUINT32 length, TINT offset, TBYTE*& data, TFile* file );
    static TINT Write( TUINT32 length, TBYTE*& data, TFile* file );
 
public:
    //-----------------------------------------------------------------------------
    // Decompressor
    //-----------------------------------------------------------------------------
 
    static uintptr_t Decompress( TFile* file, TCompress::Header* header, TBYTE* buffer, TUINT32 bufferSize );
    static int8_t    GetHeader( TFile* file, TCompress::Header& btecHeader );
    static TINT      GetCommand( TFile* file, TBOOL& hasOffset, TUINT32& size, TINT& offset );
};
 
TOSHI_NAMESPACE_END