C++ ReadHeader函数代码示例

BMMRES
	BitmapIO_EPS::GetImageInfoDlg (HWND hWnd, BitmapInfo *info, 
	const TCHAR *filename)
{
	free (iFilename);
	iFilename = NULL;

	if (filename) {
		iFilename = (TCHAR *) malloc ((_tcslen(filename)+1)*sizeof(TCHAR));
		if (iFilename)
			_tcscpy (iFilename, filename);
		ReadHeader (iFilename);
	} else if (info->Name ()) {
		iFilename = (TCHAR *) 
			malloc ((_tcslen(info->Name ())+1)*sizeof(TCHAR));
		if (iFilename)
			_tcscpy (iFilename, info->Name ());
		ReadHeader (iFilename);
	} else {
		MessageBox (hWnd, _T("EPS GetImageInfoDlg called with no file name"),
			_T("EPS Plugin"), MB_ICONINFORMATION);
		return BMMRES_FILENOTFOUND;
	}

	DialogBoxParam (hResource,
		MAKEINTRESOURCE (IDD_INFO_DIALOG),
		hWnd,
		ImageInfoDlg,
		(LPARAM) this);

	return BMMRES_SUCCESS;
}

static PSBOOK *ReadAllOldAtoms(char *bok_filename,int *NumOfWav)
 {      /* Wczytanie wszystkich zestawow ksiazek (usredniona mapa Wignera) */
   extern unsigned long NumberOfAllWaveForms;
   int i,k,NumberOfBloks,j,num_of_wav;
   PSBOOK *book=NULL;
   FILE *plik=NULL;
   HEADER head;			/* Funkcja zwraca globalna liczbe atomow */
   ATOM atom;
   float df;

   if((NumberOfBloks=LicznikKsiazek(bok_filename))==-1)
     ERROR("Problemy z odczytem struktury ksiazki !");

   num_of_wav=(int)NumberOfAllWaveForms;
   if((book=(PSBOOK *)malloc((unsigned)num_of_wav*sizeof(PSBOOK)))==NULL)
     ERROR("Brak pamieci (ReadAllAtoms) !");

   if((plik=fopen(bok_filename,"rb"))==NULL)
     ERROR("Problemy przy otwarciu zbioru !\n");

    if(ReadHeader(&head,plik)==-1)
     ERROR("Blad czytania naglowka (ReadAllAtoms) !");

    fseek(plik,0L,SEEK_SET);
    df=2.0F*M_PI/(float)(head.signal_size);

    Ec=E0=0.0F;
    for(i=0,k=0 ; i<NumberOfBloks ; i++)
     {
       if(ReadHeader(&head,plik)==-1)
	 ERROR("Blad czytania naglowka (ReadAllAtoms) !");

       if(head.signal_size!=DimBase)                /* W przypadku niezgodnosci */
	 if(prn==ON)
	   fprintf(stderr,"UWAGA ! Niezgodnosc rozmiaru bazy (%d)"
		   " i analizowanego naglowka (%d)\n",
		   DimBase,head.signal_size);

       E0+=head.signal_energy;
       for(j=0 ; j<head.book_size ; j++)
	{
	  if(ReadAtom(&atom,plik)==-1)
	    ERROR("Blad czytania atomu (ReadAllAtoms) !");

	  book[k].s=(float)(1<<(atom.octave));
	  book[k].t=(float)atom.position;
	  book[k].w=atom.modulus;
	  book[k].f=df*(float)atom.frequency;
	  book[k].amplitude=atom.amplitude;
	  Ec+=SQR(atom.modulus);
	  k++;
	}
     }
   fclose(plik);
   *NumOfWav=num_of_wav;
   return book;
 }

    //----------------------------------------------------------------------------
    //----------------------------------------------------------------------------
    void CSAnimProvider::ReadSkinnedAnimationFromFile(StorageLocation in_location, const std::string& in_filePath, const ResourceProvider::AsyncLoadDelegate& in_delegate, const SkinnedAnimationSPtr& out_resource) const
    {
        IBinaryInputStreamUPtr stream = Application::Get()->GetFileSystem()->CreateBinaryInputStream(in_location, in_filePath);

        u32 numFrames = 0;
        s32 numSkeletonNodes = 0;
        if(ReadHeader(stream, in_filePath, out_resource, numFrames, numSkeletonNodes) == false)
        {
            CS_LOG_ERROR("Failed to read header in anim: " + in_filePath);
            out_resource->SetLoadState(Resource::LoadState::k_failed);
            if(in_delegate != nullptr)
            {
                Application::Get()->GetTaskScheduler()->ScheduleTask(TaskType::k_mainThread, [=](const TaskContext&) noexcept
                {
                    in_delegate(out_resource);
                });
            }
            return;
        }
        
        ReadAnimationData(stream, numFrames, numSkeletonNodes, out_resource);
        
        out_resource->SetLoadState(Resource::LoadState::k_loaded);
        
        if(in_delegate != nullptr)
        {
            Application::Get()->GetTaskScheduler()->ScheduleTask(TaskType::k_mainThread, [=](const TaskContext&) noexcept
            {
                in_delegate(out_resource);
            });
        }
    }

// Parses the entire contents of an XNB file.
void ContentReader::ReadXnb()
{
    // Read the XNB header.
    uint32_t endPosition = ReadHeader();

    ReadTypeManifest();

    uint32_t sharedResourceCount = Read7BitEncodedInt();

    // Read the primary asset data.
    Log.WriteLine("Asset:");

    ReadObject();

    // Read any shared resource instances.
    for (uint32_t i = 0 ; i < sharedResourceCount; i++)
    {
        Log.WriteLine("Shared resource %d:", i);
        
        ReadObject();
    }

    // Make sure we read the amount of data that the file header said we should.
    if (FilePosition() != endPosition)
    {
        throw app_exception("End position does not match XNB header: unexpected amount of data was read.");
    }
}

    void Decompress(char* source, char* dest) {
        assert(source != nullptr);
        assert(dest != nullptr);

        BinaryReader reader(source);
        BinaryWriter writer(dest);
        
        ReadHeader(reader);
        maxDictSize_ = 1 << indexBits_;
        AllocateDictionary();
        
        TrieNode* previousNode = nullptr;
        unsigned char firstChar;
        unsigned char lastChar;

        while(reader.IsEOF() == false) {
            int index = reader.ReadBits(IndexBits());
            if(index == maxDictSize_ -1) break;
            
            if(index >= dictSize_) {
                firstChar = WriteString(previousNode, writer);
                writer.WriteByte(lastChar);
            }
            else {
                firstChar = WriteString(nodes_[index], writer);
            }
            
            if(previousNode) {
                InsertValue(firstChar, previousNode);
            }

            lastChar = firstChar;
            previousNode = nodes_[index];
        }
    }

Mesh::Mesh(Program &program, const char *filename)
	: Drawable(program)
	, vbuffer(-1)
	, nbuffer(-1)
	, tbuffer(-1)
	, fbuffer(-1)
	, texture(NULL)
{
	FILE *fp = fopen(filename, "r");
	if(!fp)
	{
		std::cout << "Could not open file: " << filename << " :" << strerror(errno) << std::endl;
		exit(-1);
	}

	int  num_vertices, num_faces;
	bool have_normals = false;
	bool have_tex = false;
	//Read the header
	ReadHeader(fp, num_vertices, num_faces, have_normals, have_tex);
	ReadVertexData(fp, num_vertices, have_normals, have_tex);
	ReadFaceData(fp, num_faces);

	InitBuffers();
}

    void Decompress(char* source, char* dest) {
        BinaryReader reader(source);
        ReadHeader(reader);

        BinaryWriter writer(dest);
        SlidingWindow window(nullptr, bufferSize_, MaxOffset(), MaxLength() - 1);
        window.Initialize();

        while(reader.IsEOF() == false) {
            int length = reader.ReadBits(lengthBits_);
            int value;

            if(length == MaxLength()) {
                break;
            }
            if(length == 0) {
                value = reader.ReadByte();
            }
            else {
                int offset = reader.ReadBits(offsetBits_);
                value = reader.ReadByte();

                for(int i = 0; i < length; i++) {
                    int temp = window.CurrentByte(-offset - 1);
                    writer.WriteByte(temp);
                    window.WriteByte(temp);
                    window.AdvanceWindow(1);
                }
            }

            writer.WriteByte(value);
            window.WriteByte(value);
            window.AdvanceWindow(1);
        }
    }

u64 Movie::GetMovieProgramID(const std::string& movie_file) const {
    auto header = ReadHeader(movie_file);
    if (header == boost::none)
        return 0;

    return static_cast<u64>(header.value().program_id);
}

/* Moves the cursor past the chunk header, which is six bytes. */
void t3DSParser::EnterChunk()
{
    if(m_xFile == 0 || !m_xFile->isOpen())
        return;

    ReadHeader();
}

bool Client::GetPostResult(Value& result)
{
    log_trace();
    gettimeofday( &startTime_, 0 );
    result.SetInvalid();

    if (responseProcessed_)
    {
        PreserveReceiveBuffer();
        ResetTransaction();
    }

    if (socket_.IsConnected(0) &&
        ReadHeader(result) &&
        ReadResponse(result))
    {
        switch (ProcessResponse(result))
        {
            case ProcessResponseSuccess       : return true;
            case ProcessResponseErrorKeepOpen : return false;
        }
    }

    Reset();
    return false;
}

int CADFile::ParseFile( enum OpenOptions eOptions, bool bReadUnsupportedGeometries )
{
    if( nullptr == pFileIO )
        return CADErrorCodes::FILE_OPEN_FAILED;

    if( !pFileIO->IsOpened() )
    {
        if( !pFileIO->Open( CADFileIO::read | CADFileIO::binary ) )
            return CADErrorCodes::FILE_OPEN_FAILED;
    }

    // Set flag which will tell CADLayer to skip/not skip unsupported geoms
    bReadingUnsupportedGeometries = bReadUnsupportedGeometries;

    int nResultCode;
    nResultCode = ReadSectionLocators();
    if( nResultCode != CADErrorCodes::SUCCESS )
        return nResultCode;
    nResultCode = ReadHeader( eOptions );
    if( nResultCode != CADErrorCodes::SUCCESS )
        return nResultCode;
    nResultCode = ReadClasses( eOptions );
    if( nResultCode != CADErrorCodes::SUCCESS )
        return nResultCode;
    nResultCode = CreateFileMap();
    if( nResultCode != CADErrorCodes::SUCCESS )
        return nResultCode;
    nResultCode = ReadTables( eOptions );
    if( nResultCode != CADErrorCodes::SUCCESS )
        return nResultCode;

    return CADErrorCodes::SUCCESS;
}

/*********************************************************************
 *
 *  ReceiveBytes() 
 *
 ********************************************************************/
int CConsolePort::ReceiveBytes( char* aBuff, int *aSize)
{
	int ret = 0;

	// If we are just the data part of the frame iReadingFlag is true
	if( iReadingData == 1 ) 
	{
		ret = ReadData( aBuff, aSize );
		if ( ret != 0 )
			return -1;
	
	}
	else
	{
		// Else we are reading the header - so get the next command
		ret = ReadHeader( aBuff, aSize );
		if ( ret != 0 )
			return -1;

		// Set the flag to true now that we have read the header,
		// so that the data part is read in the next iteration.
		iReadingData = 1;
	}
	
	// Return 
	return ret;
}

bool RINEX_NavigationMessage::_Read(std::ifstream &ifs)
{
	std::string buf;

	if (ifs == 0)
	{
		return false;
	}
	else
	{
		// Do nothing
	}

	if (false == ReadHeader(ifs, leapSecond))
	{
		return false;
	}
	else
	{
		// Do nothing
	}

	if (false == ReadBody(ifs, leapSecond))
	{
		return false;
	}
	else
	{
		// Do nothing
	}

	return true;
}

static int Open(void *context, SYS_FILEHANDLE file, V3XA_HANDLE *info)
{
	OGG_context *ctx = (OGG_context*)context;
	ReadHeader(ctx, file);

	if (info)
	{
		int playLength, fileSize;
		info->samplingRate = ctx->vi.rate;
#ifdef SUPPORT_IEEE_AUDIO
		info->sampleFormat = V3XA_FMTIEEE;
#else
		info->sampleFormat = V3XA_FMT16BIT;
#endif
		if (ctx->vi.channels >= 2)
			info->sampleFormat|= V3XA_FMTSTEREO;
		fileSize = FIO_cur->fsize(file);
		playLength = (fileSize * 8) / ctx->vi.bitrate_nominal;
		info->length = playLength * ctx->vi.rate << 1;
		info->loopend = 0;
		info->loopstart = 0;
		info->codec = &V3XA_Codec_OGG;
	}
	return 1;
}

void CLoader7Z::ReadBloc(const std::streampos offset, const std::size_t size)
{
#ifdef T_DEBUG
    CApplication::getApp()->log(CString("Lecture de %1 octets depuis l'offset %2").arg(size).arg(offset), ILogger::Debug);
#endif

    if (size == 0)
        return;

    char * header = new char[size];

    m_file.seekg(offset, std::ios_base::beg);
    m_file.read(header, size);

    try
    {
        switch (header[0])
        {
        case kHeader:
            ReadHeader(header);
            break;

        case kEncodedHeader:
            ReadEncodedHeader(header);
            break;
        }
    }
    catch (...)
    {
        //...
    }

    delete[] header;
    return;
}