6.2 Decompressing a file with LZNV DLL


   6.2 Decompressing (decoding) a file using the LZNV DLL


The code is available in function _loadDLL from LZNV_DLL_Tester.cpp


#include <LZNV_Defines.h> // load header file from predefined include paths


/// \brief      LZNV_Decode_File performs a straight forward file decompression without the need of any prior buffer manipulation.

/// \note       The function performs internal buffering. If you want to perform your own buffering, please use LZNV_Decode_File_wBuffer.

/// \param[in]  _wchr_filename_to_decompress: Input file path to decompress. Unicode WCHAR.

/// \param[in]  _wchr_output_filename: Output file path to decompress. This file will be a replica of the _wchr_filename_to_compress. See LZNV_Encode_File function. Unicode WCHAR.

/// \return     returns NO_ERROR (0) in case of no errors or one of the error codes defined in LZNV_Defines.h header file

///             other possible values:

///             - _LZNV_ERROR_INVALID_COMPRESSION_METHOD      

///             - _LZNV_ERROR_INVALID_BUFFER_SIZE            

///             - _LZNV_ERROR_EXPORTED_MAIN_FUNC_NOT_FOUND    

///             - _LZNV_ERROR_INVALID_PROCESS_SIZE            

///


int32_t LZNV_Decode_File(const uint8_t _encoding_method, const wchar_t* _wchr_filename_to_decompress, const wchar_t* _wchr_output_filename)

{

    int32_t _res = _LZNV_NO_ERROR_;


    ASSERT(_p_LZNV_DLL_Main_File_funct);

    if (!_p_LZNV_DLL_Main_File_funct) {

        wprintf(L"\n LZNV DLL Not Loaded? Aborting...\n\n");

        return 1;

    }


    ASSERT(_wchr_output_filename);

    ASSERT(_wchr_filename_to_decompress);

    if ((!_wchr_filename_to_decompress) || (!_wchr_output_filename))

    {

        wprintf(L"\n LZNV DLL passed NULL parameters..\n\n");

        return _LZNV_ERROR_INVALID_FILE_PATH_PARAMS;

    }


    {

        LZNV_FILE_COMMAND_PARAMS _lznv_file_command = { 0 };


        _lznv_file_command._encoding_method = _encoding_method;

        _lznv_file_command._command_to_execute = _LZNV_COMMAND_DECODE;

        _lznv_file_command._cpu_priority_level = _LZNV_NORMAL_PRIORITY_CLASS;


        ASSERT(_wchr_filename_to_decompress);

        wcsncpy_s(_lznv_file_command._source_file_path, _wchr_filename_to_decompress, _LZNV_MAXPATH_);


        ASSERT(_wchr_output_filename);

        wcsncpy_s(_lznv_file_command._target_file_path, _wchr_output_filename, _LZNV_MAXPATH_);


        int64_t s = _get_ms(); // use a high performance counter

        _res = (*_p_LZNV_DLL_Main_File_funct)(_lznv_file_command);

        int64_t e = _get_ms();

       

 // Show stats ...

    }


    return _res;

}