C++ Skip_L4函数代码示例

bool File_Zip::Zip64_end_of_central_directory_record()
{
    if (Element_Offset+12>Element_Size) //Zip64_end_of_central_directory_record
        return false; //Not enough data

    //Retrieving complete Zip64_end_of_central_directory_record size
    int64u size_of_Zip64_end_of_central_directory_record=LittleEndian2int64u(Buffer+(size_t)Element_Offset+4);
    if (Element_Offset+12+size_of_Zip64_end_of_central_directory_record>Element_Size) //end_of_central_directory all included
        return false; //Not enough data

    //Parsing
    //~ int32u offset;
    int16u version_made_by;
    Element_Begin1("Zip64 End of central directory record");
    Skip_C4(                                                    "Zip64 end of central dir signature");
    Skip_L8(                                                    "size of zip64 end of central directory record");
    Get_L2 (version_made_by,                                    "version made by");
    Param_Info1((version_made_by>>8)>20?"unused":Zip_made_by[version_made_by>>8]);
    Skip_L2(                                                    "version needed to extract");
    Skip_L4(                                                    "number of this disk");
    Skip_L4(                                                    "number of the disk");// with the start of the central directory
    Skip_L8(                                                    "total number of entries on this disk");// in the central directory
    Skip_L8(                                                    "total number of entries");// in the central directory
    Skip_L8(                                                    "size of the central directory");
    Skip_L8(                                                    "offset of start of central directory"); //  with respect to the starting disk number
    Skip_XX(size_of_Zip64_end_of_central_directory_record-44,   "zip64 extensible data sector");
    Element_End0();
    
    return true;
}

//---------------------------------------------------------------------------
void File_Cdxa::FileHeader_Parse()
{
    //Parsing
    Skip_C4(                                                    "RIFF header");
    Skip_L4(                                                    "RIFF data size");
    Skip_C4(                                                    "CDXA");
    Skip_C4(                                                    "fmt header");
    Skip_L4(                                                    "fmt size");
    Skip_L2(                                                    "user_id");
    Skip_L2(                                                    "group_id");
    Skip_L2(                                                    "attributes");
    Skip_C2(                                                    "xa_signature");
    Skip_L4(                                                    "xa_track_number");
    Skip_L4(                                                    "reserved");
    Skip_C4(                                                    "data header");
    Skip_L4(                                                    "data size");

    FILLING_BEGIN();
        Accept("CDXA");
        MI=new MediaInfo_Internal;
        MI->Option(_T("FormatDetection_MaximumOffset"), _T("1048576"));
        //MI->Option(_T("File_IsSub"), _T("1"));
        MI->Open_Buffer_Init(File_Size, File_Offset+Buffer_Offset);
    FILLING_END();
}

//---------------------------------------------------------------------------
// file header
void File_Rar::Header_Parse_Content_74()
{
    int16u name_size;
    int8u HOST_OS, METHOD, UNP_VER;
    Get_L4 (PACK_SIZE,                                          "PACK_SIZE"); //Compressed file size
    Skip_L4(                                                    "UNP_SIZE"); //Uncompressed file size
    Get_L1 (HOST_OS,                                            "HOST_OS"); Param_Info1((HOST_OS<6?Rar_host_os[HOST_OS]:"Unknown"));
    Skip_L4(                                                    "FILE_CRC");
    Skip_L4(                                                    "FTIME"); //Date and time in standard MS DOS format
    Get_L1 (UNP_VER,                                            "UNP_VER"); Param_Info1(Rar_version_number(UNP_VER)); //RAR version needed to extract file
    Get_L1 (METHOD,                                             "METHOD"); Param_Info1(((METHOD>=0x30)&&(METHOD<0x36)?Rar_packing_method[METHOD-0x30]:"Unknown"));
    Get_L2 (name_size,                                          "NAME_SIZE"); //File name size
    Skip_L4(                                                    "ATTR"); //File attributes
    if(high_fields)
    {
        Get_L4 (HIGH_PACK_SIZE,                                 "HIGH_PACK_SIZE"); //High 4 bytes of 64 bit value of compressed file size.
        Skip_L4(                                                "HIGH_UNP_SIZE"); //High 4 bytes of 64 bit value of uncompressed file size.
    }
    else
        HIGH_PACK_SIZE=0;
    if (usual_or_utf8)
    {
        //Must test the content before reading, looking fore zero byte
        if (Element_Offset+name_size>Element_Size)
        {
            Skip_XX(Element_Size-Element_Offset,                "Error");
            return;
        }
        int64u ZeroPos=0;
        while (ZeroPos<name_size)
        {
            if (Buffer[Buffer_Offset+(size_t)(Element_Offset+ZeroPos)]==0)
                break; //Found
            ZeroPos++;
        }

        if (ZeroPos==name_size)
            Skip_UTF8(name_size,                                "FILE_NAME");
        else
        {
            Skip_Local(ZeroPos,                                 "FILE_NAME"); //Up to ZeroPos
            Skip_L1(                                            "Zero");
            Skip_UTF16L(name_size-(ZeroPos+1),                  "FILE_NAME"); //Spec is not precise, "Unicode" without encoding format (character size, endianess), because RAR is from Windows, we hope this is the format from Windows (UTF-16 Little Endian)
        }
    }
    else
        Skip_Local(name_size,                                   "FILE_NAME");

    if (salt)
        Skip_L8(                                                "SALT");
    //if(exttime)
        //Skip_XX("EXT_TIME"); //Which size?
}

//---------------------------------------------------------------------------
void File_Tga::Tga_File_Footer()
{
    if (Version==1)
        return; //No footer

    Element_Begin1("Image/color Map Data");
    Skip_L4(                                                    "Extension Area Offset");
    Skip_L4(                                                    "Developer Directory Offset");
    Skip_Local(16,                                              "Signature");
    Skip_Local( 1,                                              "Reserved Character");
    Skip_L1(                                                    "Binary Zero String Terminator");
    Element_End0();
}

//---------------------------------------------------------------------------
void File_Kate::Identification()
{
    Element_Name("Identification");

    //Parsing
    Ztring Language, Category;
    int16u Width, Height;
    int8u VersionMajor, VersionMinor, NumHeaders, TextEncoding;
    Skip_B1   (                                                 "Signature");
    Skip_Local(7,                                               "Signature");
    Skip_L1(                                                    "Reserved");
    Get_L1 (VersionMajor,                                       "version major");
    Get_L1 (VersionMinor,                                       "version minor");
    Get_L1 (NumHeaders,                                         "num headers");
    Get_L1 (TextEncoding,                                       "text encoding");
    Skip_L1(                                                    "directionality");
    Skip_L1(                                                    "Reserved");
    Skip_L1(                                                    "granule shift");
    Skip_L4(                                                    "Reserved");
    Get_L2 (Width,                                              "cw sh + canvas width");
    Get_L2 (Height,                                             "ch sh + canvas height");
    /*
    BS_Begin();
    Skip_BS( 4,                                                 "cw sh");
    Get_BS (12, Width,                                          "canvas width");
    Skip_BS( 4,                                                 "ch sh");
    Get_BS (12, Height,                                         "canvas height");
    BS_End();
    */
    Skip_L4(                                                    "granule rate numerator");
    Skip_L4(                                                    "granule rate denominator");
    Get_UTF8(16, Language,                                      "Language");
    Get_UTF8(16, Category,                                      "Category");

    FILLING_BEGIN();
        Accept("Kate");

        Stream_Prepare(Stream_Text);
        Fill(Stream_Text, 0, Text_Format, "Kate");
        Fill(Stream_Text, 0, Text_Codec,  "Kate");
        Fill(Stream_Text, 0, Text_Language, Language);
        Fill(Stream_Text, 0, Text_Language_More, Kate_Category(Category));

        Finish("Kate");
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_ApeTag::HeaderFooter()
{
    //Parsing
    int32u Flags;
    Skip_C8(                                                    "Preamble");
    Skip_L4(                                                    "Version");
    Skip_L4(                                                    "Size");
    Skip_L4(                                                    "Count");
    Get_L4 (Flags,                                              "Flags");
        Skip_Flags(Flags,  0,                                   "Read Only");
        Skip_Flags(Flags,  1,                                   "Binary");
        Skip_Flags(Flags,  2,                                   "Locator of external stored information");
        Skip_Flags(Flags, 29,                                   "Is the header");
        Skip_Flags(Flags, 30,                                   "Contains a footer");
        Skip_Flags(Flags, 31,                                   "Contains a header");
    Skip_L8(                                                    "Reserved");
}

//---------------------------------------------------------------------------
void File_Pmp::FileHeader_Parse()
{
     //Parsing
    int32u version, video_format=0, nb_frames=0, video_width=0, video_height=0, time_base_num=0, time_base_den=0, audio_format=0, sample_rate=0, channels=0;

    Skip_C4(                                                    "Signature");
    Get_L4 (version,                                            "Version");
    if (version==1)
    {
        Get_L4 (video_format,                                   "video_format");
        Get_L4 (nb_frames,                                      "number of frames");
        Get_L4 (video_width,                                    "video_width");
        Get_L4 (video_height,                                   "video_height");
        Get_L4 (time_base_num,                                  "time_base_num");
        Get_L4 (time_base_den,                                  "time_base_den");
        Skip_L4(                                                "number of audio streams");
        Get_L4 (audio_format,                                   "audio_format");
        Get_L4 (channels,                                       "channels");
        Skip_L4(                                                "unknown");
        Get_L4 (sample_rate,                                    "sample_rate");
    }

    FILLING_BEGIN();
        Accept("PMP");

        Fill(Stream_General, 0, General_Format, "PMP");

        if (version==1)
        {
            Stream_Prepare(Stream_Video);
            Fill(Stream_Video, 0, Video_Format, Pmp_video_format(video_format));
            Fill(Stream_Video, 0, Video_FrameCount, nb_frames);
            Fill(Stream_Video, 0, Video_Width, video_width);
            Fill(Stream_Video, 0, Video_Height, video_height);
            Fill(Stream_Video, 0, Video_FrameRate, (float)time_base_den / 100);
            Stream_Prepare(Stream_Audio);
            Fill(Stream_Audio, 0, Audio_Format, Pmp_audio_format(audio_format));
            Fill(Stream_Audio, 0, Audio_Channel_s_, channels);
            Fill(Stream_Audio, 0, Audio_SamplingRate, sample_rate);
        }

        //No more need data
        Finish("PMP");
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Fraps::Version2()
{
    //Parsing
    if (Element_Size>8) //Else this is a repeat frame
    {
        Skip_C4(                                                "FPSx");
        Skip_L4(                                                "offset to the Y plane (minus 8)");
        Skip_L4(                                                "offset to the U plane (minus 8)");
        Skip_L4(                                                "offset to the V plane (minus 8)");
        Skip_XX(Element_Size-Element_Offset,                    "data");
    }

    FILLING_BEGIN();
        Accept();
        Fill();
        Fill(Stream_Video, 0, Video_ColorSpace, "YUV");
        Fill(Stream_Video, 0, Video_BitDepth, 8);
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Ps2Audio::SShd()
{
    Element_Begin1("SShd (Header)");
        //Parsing
        int32u Size, Format, SamplingRate, Channels;
        Skip_C4(                                                "ID");
        Get_L4 (Size,                                           "Size");
        if (Size!=0x18)
        {
            Trusted_IsNot("Bad size");
            return;
        }
        Get_L4 (Format,                                         "Format");
        Get_L4 (SamplingRate,                                   "Sampling rate");
        Get_L4 (Channels,                                       "Channels");
        Skip_L4(                                                "Bytes per channel");
        Skip_L4(                                                "Reserved");
        Skip_L4(                                                "Reserved");
    Element_End0();

    FILLING_BEGIN();
        Accept("PS2 Audio");

        BitRate=SamplingRate*Channels*16; //Always 16 bits

        Stream_Prepare(Stream_Audio);
        Ztring FormatS;
        switch(Format)
        {
            case 0x00000001 : FormatS=__T("PCM"); break;
            case 0x00000010 : FormatS=__T("ADPCM"); break;
            default         : ;
        }
        Fill(Stream_Audio, 0, Audio_Format, FormatS);
        Fill(Stream_Audio, 0, Audio_Codec,  FormatS);
        Fill(Stream_Audio, 0, Audio_MuxingMode, "PS2");
        Fill(Stream_Audio, 0, Audio_SamplingRate, SamplingRate);
        Fill(Stream_Audio, 0, Audio_Channel_s_, Channels);
        Fill(Stream_Audio, 0, Audio_BitRate, BitRate);
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Jpeg::APP1_EXIF()
{
    //Parsing
    Element_Begin1("Exif");
        int32u Alignment;
        Get_C4(Alignment,                                       "Alignment");
        if (Alignment==0x49492A00)
            Skip_B4(                                            "First_IFD");
        if (Alignment==0x4D4D2A00)
            Skip_L4(                                            "First_IFD");
    Element_End0();
}

//---------------------------------------------------------------------------
void File_Bmp::BitmapInfoHeader()
{
    //Parsing
    Element_Begin("Bitmap Info header", 40);
    int32u Width, Height, CompressionMethod;
    int16u BitsPerPixel;
    Skip_L4(                                                    "Size");
    Get_L4 (Width,                                              "Width");
    Get_L4 (Height,                                             "Height");
    Skip_L2(                                                    "Color planes");
    Get_L2 (BitsPerPixel,                                       "Bits per pixel");
    Get_L4 (CompressionMethod,                                  "Compression method"); Param_Info(Bmp_CompressionMethod(CompressionMethod));
    Skip_L4(                                                    "Image size");
    Skip_L4(                                                    "Horizontal resolution");
    Skip_L4(                                                    "Vertical resolution");
    Skip_L4(                                                    "Number of colors in the color palette");
    Skip_L4(                                                    "Number of important colors used");
    Element_End();

    FILLING_BEGIN();
        Fill(Stream_Image, 0, Image_Width, Width);
        Fill(Stream_Image, 0, Image_Height, Height);
        Fill(Stream_Image, 0, Image_BitDepth, BitsPerPixel);
        Fill(Stream_Image, 0, Image_Format, Bmp_CompressionMethod(CompressionMethod));
        Fill(Stream_Image, 0, Image_Codec, Bmp_CompressionMethod(CompressionMethod));
    FILLING_END();
}

//---------------------------------------------------------------------------
// RIFF Header, 44 bytes
// RIFF header                      4 bytes, Pos=0
// RIFF data size                   4 bytes, Pos=4
// Format (CDXA)                    4 bytes, Pos=8
// Format Header                    4 bytes, Pos=12
// Format Size                      4 bytes, Pos=16
// Format user_id                   2 bytes, Pos=20
// Format group_id                  2 bytes, Pos=22
// Format attributes                2 bytes, Pos=24
// Format xa_signature              2 bytes, Pos=26 ("XA")
// Format xa_track_number           4 bytes, Pos=28
// Format Reserved                  4 bytes, Pos=32
// Data Header                      4 bytes, Pos=36
// Data Size                        4 bytes, Pos=40
//
// Attributes (big endian):
// 15 Directory
// 14 CDDA
// 13 Interleaved
// 12 Mode2Form2 --> 2324 bytes/block
// 11 Mode2Form1 --> 2048 bytes/block
// 10 Exec_Other
// 09 Reserved
// 08 Read_Other
// 07 Reserved
// 06 Exec_Group
// 05 Reserved
// 04 Read_Group
// 03 Reserved
// 02 Exec_User
// 01 Reserved
// 00 Read_User
//
void File_Cdxa::FileHeader_Parse()
{
    //Parsing
    if (                CC4(Buffer+Buffer_Offset+0x00)!=CC4("RIFF")
     || LittleEndian2int32u(Buffer+Buffer_Offset+0x04)!=LittleEndian2int32u(Buffer+Buffer_Offset+0x28)+0x24 //Sizes of chunks
     ||                 CC4(Buffer+Buffer_Offset+0x08)!=CC4("CDXA")
     ||                 CC4(Buffer+Buffer_Offset+0x0C)!=CC4("fmt ")
     || LittleEndian2int32u(Buffer+Buffer_Offset+0x10)!=0x10
     ||                 CC4(Buffer+Buffer_Offset+0x24)!=CC4("data")
       )
    {
        Finnished();
        return;
    }

    //Parsing
    Element_Begin("CDXA header");
    Skip_C4(                                                    "RIFF header");
    Skip_L4(                                                    "RIFF data size");
    Skip_C4(                                                    "CDXA");
    Skip_C4(                                                    "fmt header");
    Skip_L4(                                                    "fmt size");
    Skip_L2(                                                    "user_id");
    Skip_L2(                                                    "group_id");
    Skip_L2(                                                    "attributes");
    Skip_C2(                                                    "xa_signature");
    Skip_L4(                                                    "xa_track_number");
    Skip_L4(                                                    "reserved");
    Skip_C4(                                                    "data header");
    Skip_L4(                                                    "data size");
    Element_End();

    FILLING_BEGIN();
        if (MI==NULL)
            MI=new MediaInfo;

        Stream_Prepare(Stream_General);
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_La::FileHeader_Parse()
{
    //Parsing
    Ztring Major, Minor;
    int32u SampleRate, Samples, BytesPerSecond, UnCompSize, WAVEChunk, FmtSize, FmtChunk, CRC32;
    int16u RawFormat, Channels, BytesPerSample, BitsPerSample;

    Skip_Local(2,                                               "signature");
    Get_Local (1, Major,                                        "major_version");
    Get_Local (1, Minor,                                        "minor_version");
    Get_L4 (UnCompSize,                                         "uncompressed_size");
    Get_L4 (WAVEChunk,                                          "chunk");
    Skip_L4(                                                    "fmt_size");
    Get_L4 (FmtChunk,                                           "fmt_chunk");
    Get_L4 (FmtSize,                                            "fmt_size");
    Get_L2 (RawFormat,                                          "raw_format");
    Get_L2 (Channels,                                           "channels"); Param_Info2(Channels, " channel(s)");
    Get_L4 (SampleRate,                                         "sample_rate");
    Get_L4 (BytesPerSecond,                                     "bytes_per_second");
    Get_L2 (BytesPerSample,                                     "bytes_per_sample");
    Get_L2 (BitsPerSample,                                      "bits_per_sample");
    Get_L4 (Samples,                                            "samples");
    Skip_L1(                                                    "flags");
    Get_L4 (CRC32,                                              "crc");

    FILLING_BEGIN()
        if (SampleRate==0)
            return;
        Duration=((int64u)Samples/Channels)*1000/SampleRate; // Seems that it's samples per channels otherwise Duration is doubled ??!!
        if (Duration==0)
            return;
        UncompressedSize=(Samples)*Channels*(BitsPerSample/8);
        if (UncompressedSize==0)
            return;

        File__Tags_Helper::Accept("LA");
        Fill(Stream_General, 0, General_Format_Version, Major+__T('.')+Minor);

        File__Tags_Helper::Stream_Prepare(Stream_Audio);
        Fill(Stream_Audio, 0, Audio_Format, "LA");
        Fill(Stream_Audio, 0, Audio_Codec, "LA");
        Fill(Stream_Audio, 0, Audio_Format_Version, Major+__T('.')+Minor);
        Fill(Stream_Audio, 0, Audio_BitDepth, BitsPerSample);
        Fill(Stream_Audio, 0, Audio_Channel_s_, Channels);
        Fill(Stream_Audio, 0, Audio_SamplingRate, SampleRate);
        Fill(Stream_Audio, 0, Audio_Duration, Duration);

        //No more need data
        File__Tags_Helper::Finish("LA");
    FILLING_END();
}

//---------------------------------------------------------------------------
void File_Celt::Identification()
{
    Element_Name("Identification");

    //Parsing
    Ztring celt_version;
    int32u Celt_version_id, sample_rate, nb_channels;
    Skip_Local(8,                                               "celt_codec_id");
    Get_Local(20, celt_version,                                 "celt_version");
    Get_L4 (Celt_version_id,                                    "celt_version_id");
    Skip_L4(                                                    "header_size");
    Get_L4 (sample_rate,                                        "rate");
    Get_L4 (nb_channels,                                        "nb_channels");
    Skip_L4(                                                    "frame_size");
    Skip_L4(                                                    "overlap");
    Skip_L4(                                                    "bytes_per_packet");
    Skip_L4(                                                    "extra_headers");

    //Filling
    FILLING_BEGIN()
        Accept("CELT");

        Stream_Prepare(Stream_Audio);
        Fill(Stream_Audio, 0, Audio_Format, "CELT");
        Fill(Stream_Audio, 0, Audio_Codec, "CELT");

        if (!celt_version.empty())
        {
            //Fill(Stream_Audio, 0, Audio_Encoded_Library, celt_version); //Need more info about hte different possibilities, in the meanwhile trusting more the comment part
            Fill(Stream_Audio, 0, Audio_SamplingRate, sample_rate);
            Fill(Stream_Audio, 0, Audio_Channel_s_, nb_channels);
        }

    FILLING_END();

    //Filling
    Identification_Done=true;
}

//---------------------------------------------------------------------------
void File_Cdxa::FileHeader_Parse()
{
    //Parsing
    Skip_C4(                                                    "RIFF header");
    Skip_L4(                                                    "RIFF data size");
    Skip_C4(                                                    "CDXA");
    Skip_C4(                                                    "fmt header");
    Skip_L4(                                                    "fmt size");
    Skip_L2(                                                    "user_id");
    Skip_L2(                                                    "group_id");
    Skip_L2(                                                    "attributes");
    Skip_C2(                                                    "xa_signature");
    Skip_L4(                                                    "xa_track_number");
    Skip_L4(                                                    "reserved");
    Skip_C4(                                                    "data header");
    Skip_L4(                                                    "data size");

    FILLING_BEGIN();
        MI=new MediaInfo_Internal;
        MI->Option(_T("FormatDetection_MaximumOffset"), _T("1048576"));
        Stream_Prepare(Stream_General);
        Accept("CDXA");
    FILLING_END();
}