static uint32_t
EchoNewDataToHost(tUSBDBulkDevice *psDevice, uint8_t *pui8Data,
                  uint32_t ui32NumBytes)
{

    uint32_t ui32Loop, ui32Space, ui32Count;
    uint32_t ui32ReadIndex;
    uint32_t ui32WriteIndex;
    tUSBRingBufObject sTxRing;
		unsigned char Data_Merge_flag=0,Data_count=0,Addr_shift_Cnt=8,Rx_Arr_Index=0,EEPROM_Buff_Index=0,Addr_Flag=0,Error_Data_Index=0;
		uint32_t	pui32eprom = 0x00, addrdata=0x00;
		uint32_t pui32Weprom[64]={0x00};

    USBBufferInfoGet(&g_sTxBuffer, &sTxRing);

    ui32Space = USBBufferSpaceAvailable(&g_sTxBuffer);

    ui32Loop = (ui32Space < ui32NumBytes) ? ui32Space : ui32NumBytes;
    ui32Count = ui32Loop;

    g_ui32RxCount += ui32NumBytes;

    ui32ReadIndex = (uint32_t)(pui8Data - g_pui8USBRxBuffer);
    ui32WriteIndex = sTxRing.ui32WriteIndex;
	
			for(Rx_Arr_Index=0x00;Rx_Arr_Index<ui32Loop;Rx_Arr_Index++)
			{
				pui32Data[Rx_Arr_Index]	=	g_pui8USBRxBuffer[ui32ReadIndex];
			
				ui32ReadIndex++;
				ui32ReadIndex = (ui32ReadIndex == BULK_BUFFER_SIZE) ?
                        0 : ui32ReadIndex;			
			}
					
			for(Rx_Arr_Index=0x00;Rx_Arr_Index<ui32Loop;Rx_Arr_Index++)
			{
				
				if(Rx_Arr_Index<0x03)
				{
					addrdata = addrdata | (Ascii_To_Num(pui32Data[Rx_Arr_Index]) << Addr_shift_Cnt);
					Addr_shift_Cnt = Addr_shift_Cnt - 4;
					if(Rx_Arr_Index == 0x02)
					{
							if((addrdata < 0x000) || (addrdata > 0xfff))
							{
									goto error;
							}
						if((addrdata >= 0x000) && (addrdata <= 0x0f0))
							Addr_Flag = 1;
					}
				}
			  if(Rx_Arr_Index==0x04)
			  {
					Data_count = (Ascii_To_Num(pui32Data[Rx_Arr_Index-1]) << 4) | Ascii_To_Num(pui32Data[Rx_Arr_Index]);
					if(Addr_Flag == 1)
					{
					Data_count = (Data_count * 0x02)+0x04;
					}
					else
					{
						Data_count = Data_count +0x04;
					}
			  }
								
				if((Rx_Arr_Index>=0x05)&&(Rx_Arr_Index<=Data_count))
				{
					if( Addr_Flag == 1)
					{
						if(Data_Merge_flag == 0)
						{
							pui32eprom = (Ascii_To_Num(pui32Data[Rx_Arr_Index]) << 4);
							Data_Merge_flag=1;
						}
						else 
						{
							pui32eprom = pui32eprom | Ascii_To_Num(pui32Data[Rx_Arr_Index]);
							if(pui32eprom > 0x59)
							{
								error:
								for(Error_Data_Index=0;Error_Data_Index<5;Error_Data_Index++,ui32WriteIndex++)
								{
									g_pui8USBTxBuffer[ui32WriteIndex] = Error_data[Error_Data_Index];
								}
								goto end;
							}
							pui32Data[Rx_Arr_Index] = pui32eprom;
							Data_Merge_flag=0;
							goto write;
						}	
					}
					
			 if((Rx_Arr_Index>Data_count) || (Addr_Flag == 0))
				{
					write:
					pui32Weprom[EEPROM_Buff_Index++]=pui32Data[Rx_Arr_Index];
					pui32eprom = 0x00;
				}
			if((Rx_Arr_Index>Data_count) && (Addr_Flag == 0))
			break;
			}	
		}
							EEPROMProgram(pui32Weprom, addrdata, sizeof(pui32Weprom));
					
		end:
    USBBufferDataWritten(&g_sTxBuffer, ui32Count);
    return(ui32Count);
  
}
int Ascii_To_Num(int Rx_Data)
{
					if((Rx_Data >= 0x30) && (Rx_Data <= 0x39))
					{
						Rx_Data = Rx_Data - 0x30;
					}
					else if((Rx_Data >= 0x61) && (Rx_Data <= 0x66 )) 
					{
						switch(Rx_Data)
						{
							case 0x61 :
											Rx_Data = 0x0A;
											break;
							case 0x62 :
											Rx_Data = 0x0B;
											break;
							case 0x63 :
											Rx_Data = 0x0C;
											break;
							case 0x64 :
											Rx_Data = 0x0D;
											break;
							case 0x65 :
											Rx_Data = 0x0E;
											break;
							case 0x66 :
											Rx_Data = 0x0F;
											break;
						}
					}
  return Rx_Data;
}

main and rest all are almost same...