C++ GetBufferSize函数代码示例

void AxString::Replace(const char *pTarget, const char *pSubs, bool bAll, int iOffset)
{
   if (AX_ISZERO(pTarget))
      return ;

   unsigned int iTargetLen  = strlen(pTarget);
   unsigned int iSubsLen    = AX_ISZERO(pSubs) ? 0 : strlen(pSubs);

   if (GetSize() < iTargetLen) 
      return;

   do {
      int pos = Find(pTarget, iOffset);
      if (AxString::npos == pos)
         return ;

      // splice
      unsigned int iNewLen = GetSize() - iTargetLen + iSubsLen;
      if (GetBufferSize() <= iNewLen) {
         Resize( GetBufferSize() * 2 );
      }

      if ((pos+iTargetLen) < GetSize()) {
         memmove((void*)(c_str()+pos+iSubsLen), (void*)(c_str()+pos+iTargetLen), GetSize()-pos-iTargetLen+1);
      }

      memcpy(m_pByteArray+pos, pSubs, iSubsLen);
      m_pByteArray[iNewLen] = '\0';
      m_iDataLength = iNewLen;

      iOffset = pos + iSubsLen;
   } while (bAll);
}

TemporaryRef<gfx::DataSourceSurface>
BufferTextureHost::GetAsSurface()
{
  RefPtr<gfx::DataSourceSurface> result;
  if (mFormat == gfx::SurfaceFormat::UNKNOWN) {
    NS_WARNING("BufferTextureHost: unsupported format!");
    return nullptr;
  } else if (mFormat == gfx::SurfaceFormat::YUV) {
    YCbCrImageDataDeserializer yuvDeserializer(GetBuffer(), GetBufferSize());
    if (!yuvDeserializer.IsValid()) {
      return nullptr;
    }
    result = yuvDeserializer.ToDataSourceSurface();
    if (NS_WARN_IF(!result)) {
      return nullptr;
    }
  } else {
    ImageDataDeserializer deserializer(GetBuffer(), GetBufferSize());
    if (!deserializer.IsValid()) {
      NS_ERROR("Failed to deserialize image!");
      return nullptr;
    }
    result = deserializer.GetAsSurface();
  }
  return result.forget();
}

/////////////////////////////////////////////////////////////////////////
// 원하는 길이만큼 읽기위치 에서 삭제.
//
// Parameters: 없음.
// Return: 없음.
/////////////////////////////////////////////////////////////////////////
void CAyaStreamSQ::RemoveData(int iSize)
{
	if (GetUseSize() < iSize)
		return;
	else
	{
		if (m_iReadPos + iSize >= GetBufferSize())
			m_iReadPos = (m_iReadPos + iSize) % GetBufferSize();
		else
			m_iReadPos += iSize;
	}
}

CAmxxReader::Error CAmxxReader::GetSection(void *buffer)
{
    if (!m_pFile)
        return m_Status;

    if (m_AmxxFile)
    {
        PluginEntry *pe = &(m_Bh.plugins[m_Entry]);
        char *tempBuffer = new char[m_SectionLength + 1];
        fseek(m_pFile, pe->offs, SEEK_SET);
        DATAREAD((void *)tempBuffer, 1, m_SectionLength);
        uLongf destLen = GetBufferSize();
        int result = uncompress((Bytef *)buffer, &destLen, (Bytef *)tempBuffer, m_SectionLength);
        delete [] tempBuffer;

        if (result != Z_OK)
        {
            AMXXLOG_Log("[AMXX] Zlib error encountered: %d(%d)", result, m_SectionLength);
            m_Status = Err_Decompress;
            return Err_Decompress;
        }

        return Err_None;
    } else {
        // new file type: go to the section table entry
        fseek(m_pFile, m_SectionHdrOffset, SEEK_SET);
        // go to the offset
        TableEntry entry;
        DATAREAD(&entry, sizeof(entry), 1);
        fseek(m_pFile, entry.offset, SEEK_SET);
        uLongf destLen = GetBufferSize();
        // read the data to a temporary buffer
        char *tempBuffer = new char[m_SectionLength + 1];
        //fread(tempBuffer, sizeof(char), m_SectionLength, m_pFile);
        DATAREAD((void*)tempBuffer, 1, m_SectionLength);
        // decompress
        int result = uncompress((Bytef *)buffer, &destLen, (Bytef *)tempBuffer, m_SectionLength);
        delete [] tempBuffer;

        if (result != Z_OK)
        {
            AMXXLOG_Log("[AMXX] Zlib error encountered: %d(%d)", result, m_SectionLength);
            m_Status = Err_Decompress;

            return Err_Decompress;
        }

        return Err_None;
    }
}

void
BufferTextureHost::InitSize()
{
  if (mFormat == gfx::SurfaceFormat::YUV) {
    YCbCrImageDataDeserializer yuvDeserializer(GetBuffer(), GetBufferSize());
    if (yuvDeserializer.IsValid()) {
      mSize = yuvDeserializer.GetYSize();
    }
  } else if (mFormat != gfx::SurfaceFormat::UNKNOWN) {
    ImageDataDeserializer deserializer(GetBuffer(), GetBufferSize());
    if (deserializer.IsValid()) {
      mSize = deserializer.GetSize();
    }
  }
}

void FSlateElementIndexBuffer::FillBuffer( const TArray<SlateIndex>& InIndices, bool bShrinkToFit  )
{
	check( IsInRenderingThread() );

	if( InIndices.Num() )
	{
		uint32 NumIndices = InIndices.Num();

		uint32 RequiredBufferSize = NumIndices*sizeof(SlateIndex);

		// resize if needed
		if( RequiredBufferSize > GetBufferSize() || bShrinkToFit )
		{
			// Use array resize techniques for the vertex buffer
			ResizeBuffer( InIndices.GetAllocatedSize() );
		}

		BufferUsageSize += RequiredBufferSize;

		void* IndicesPtr = RHILockIndexBuffer( IndexBufferRHI, 0, RequiredBufferSize, RLM_WriteOnly );

		FMemory::Memcpy( IndicesPtr, InIndices.GetData(), RequiredBufferSize );

		RHIUnlockIndexBuffer(IndexBufferRHI);
	}
}

Error EventBuffer::BeginRead(void *&pBuffer, size_t iBytesWanted)
{
   BufferEvent   *pEvent;
   int   iReadIndex;
   size_t iMaxBytes;

   pEvent = m_pQueue->Peek();
   iReadIndex = GetReadIndex();

   if (pEvent && pEvent->iIndex == iReadIndex)
   {
      return kError_EventPending;
   }

   if (!pEvent)
   {
       return PullBuffer::BeginRead(pBuffer, iBytesWanted);
   }

   if (pEvent->iIndex > iReadIndex)
   {
      iMaxBytes = pEvent->iIndex - iReadIndex;
   }
   else
   {
      iMaxBytes = (GetBufferSize() - iReadIndex) + pEvent->iIndex;
   }

   if (iBytesWanted >= iMaxBytes)
      return kError_EventPending;
   else
      return PullBuffer::BeginRead(pBuffer, iBytesWanted);

}

//****************************************************************************
//
//! checks how much buffer is Empty.
//! 
//! \param pCircularBuffer is a pointer to the control structure for Circular.
//!    Buffer.
//!
//! This function  
//!        1. Retreives the amount of Buffer Empty.
//!
//! \return the amount of buffer Empty.
//
//****************************************************************************
unsigned int
GetBufferEmptySize(tCircularBuffer *pCircularBuffer)
{
    unsigned int uiBufferFilled;
    uiBufferFilled = GetBufferSize(pCircularBuffer);
    return (pCircularBuffer->ulBufferSize - uiBufferFilled);
}

/////////////////////////////////////////////////////////////////////////
// 버퍼의 모든 데이타 삭제.
//
// Parameters: 없음.
// Return: 없음.
/////////////////////////////////////////////////////////////////////////
void CAyaStreamSQ::ClearBuffer(void)
{
	for (int iCnt = 0; iCnt < GetBufferSize(); iCnt++)
	{
		m_chpBuffer[iCnt] = 0;
	}
}

   void
   SMTPClientConnection::StartSendFile_(const String &sFilename)
   {
      try
      {
         current_file_.Open(sFilename, File::OTReadOnly);
      }
      catch (...)
      {
         String sErrorMsg;
         sErrorMsg.Format(_T("Could not send file %s via socket since it does not exist."), sFilename.c_str());

         ErrorManager::Instance()->ReportError(ErrorManager::High, 5019, "SMTPClientConnection::_SendFileContents", sErrorMsg);

         return;
      }

      transmission_buffer_.Initialize(shared_from_this());

      std::shared_ptr<ByteBuffer> pBuf = current_file_.ReadChunk(GetBufferSize());

      if (pBuf->GetSize() == 0)
         return;

      BYTE *pSendBuffer = (BYTE*) pBuf->GetBuffer();
      size_t iSendBufferSize = pBuf->GetSize();

      // Append the transmission buffer
      transmission_buffer_.Append(pSendBuffer, iSendBufferSize);
      
	  ReadAndSend_();
   }

//----------------------------------------------------------------------------
//! @brief	  	バックバッファへのポインタを取得します。
//! @param		buff : バックバッファへのポインタを返すためのバッファへのポインタ
//! @param		size : バッファのサイズを返す変数へのポインタ
//! @return		エラーコード
//----------------------------------------------------------------------------
HRESULT TBufferRenderer::GetBackBuffer( BYTE **buff, long *size )
{
	CAutoLock cAutoLock(&m_BufferLock);	// クリティカルセクション
	*buff = GetBackBuffer();
	*size = GetBufferSize();
	return S_OK;
}

static int sendMessage(EMBX_VOID *message)
{
	int        *typedMessage = (int *) message;
	EMBX_UINT   size;
	int         stop;
	int         portIndex;
	EMBX_ERROR  err;

	/* get the size of the current message */
	EMBX(GetBufferSize(message, &size));

	/* get the number of the current stop */
	stop = typedMessage[0];
	assert(stop <= NUM_STOPS);
	if (stop == NUM_STOPS) {
		return 0;
	}

	/* determine the port that this message is next due
	 * to stop at
	 */
	portIndex = typedMessage[stop + 1];

	/* update the current stop index */
	typedMessage[0] = stop + 1;

	VERBOSE(printf("Sending message to portIndex %d\n", portIndex));

	/* finally send the message to the next stop */
	err = EMBX_I(SendMessage(outPort[portIndex], message, size));
	assert(EMBX_SUCCESS == err || EMBX_INVALID_PORT == err);

	return 1;
}

void CCoreAudioDevice::Close()
{
  if (!m_DeviceId)
    return;

  // Stop the device if it was started
  Stop();

  // Unregister the IOProc if we have one
  RemoveIOProc();

  SetHogStatus(false);
  CCoreAudioHardware::SetAutoHogMode(false);

  if (m_MixerRestore > -1) // We changed the mixer status
    SetMixingSupport((m_MixerRestore ? true : false));
  m_MixerRestore = -1;

  if (m_SampleRateRestore != 0.0f)
    SetNominalSampleRate(m_SampleRateRestore);

  if (m_BufferSizeRestore && m_BufferSizeRestore != GetBufferSize())
  {
    SetBufferSize(m_BufferSizeRestore);
    m_BufferSizeRestore = 0;
  }

  m_IoProc = NULL;
  m_DeviceId = 0;
  m_ObjectListenerProc = NULL;
}

   void
   SMTPClientConnection::_StartSendFile(const String &sFilename)
   {
      if (!_currentFile.Open(sFilename, File::OTReadOnly))
      {
         String sErrorMsg;
         sErrorMsg.Format(_T("Could not send file %s via socket since it does not exist."), sFilename);

         ErrorManager::Instance()->ReportError(ErrorManager::High, 5019, "SMTPClientConnection::_SendFileContents", sErrorMsg);

         return;
      }

      _transmissionBuffer.Initialize(this);

      shared_ptr<ByteBuffer> pBuf = _currentFile.ReadChunk(GetBufferSize());

      if (!pBuf)
         return;

      BYTE *pSendBuffer = (BYTE*) pBuf->GetBuffer();
      int iSendBufferSize = pBuf->GetSize();

      // Append the transmission buffer
      _transmissionBuffer.Append(pSendBuffer, iSendBufferSize);
      
	  _ReadAndSend();
   }

    _Must_inspect_result_
    NTSTATUS
    ValidateMemoryOffsets(
        __in_opt PWDFMEMORY_OFFSET Offsets
        )
    {
        NTSTATUS status;
        size_t total;

        if (Offsets == NULL) {
            return STATUS_SUCCESS;
        }

        status = RtlSizeTAdd(Offsets->BufferLength, Offsets->BufferOffset, &total);

        if (!NT_SUCCESS(status)) {
            return status;
        }

        if (total > GetBufferSize()) {
            return STATUS_INTEGER_OVERFLOW;
        }

        return STATUS_SUCCESS;
    }