www.pudn.com > Nestopia137src.zip > NstApiBarcodeReader.cpp

//////////////////////////////////////////////////////////////////////////////////////// 
// 
// Nestopia - NES/Famicom emulator written in C++ 
// 
// Copyright (C) 2003-2007 Martin Freij 
// 
// This file is part of Nestopia. 
// 
// Nestopia is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published by 
// the Free Software Foundation; either version 2 of the License, or 
// (at your option) any later version. 
// 
// Nestopia is distributed in the hope that it will be useful, 
// but WITHOUT ANY WARRANTY; without even the implied warranty of 
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
// GNU General Public License for more details. 
// 
// You should have received a copy of the GNU General Public License 
// along with Nestopia; if not, write to the Free Software 
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
// 
//////////////////////////////////////////////////////////////////////////////////////// 
 
#include  
#include  
#include "../NstMachine.hpp" 
#include "../NstImage.hpp" 
#include "../NstPrpBarcodeReader.hpp" 
#include "NstApiBarcodeReader.hpp" 
 
namespace Nes 
{ 
	namespace Api 
	{ 
		#ifdef NST_MSVC_OPTIMIZE 
		#pragma optimize("s", on) 
		#endif 
 
		Core::Peripherals::BarcodeReader* BarcodeReader::Query() const 
		{ 
			if (emulator.image) 
			{ 
				if (Core::Image::ExternalDevice device = emulator.image->QueryExternalDevice( Core::Image::EXT_BARCODE_READER )) 
					return static_cast(device); 
			} 
 
			return NULL; 
		} 
 
		uint BarcodeReader::Randomize(char (&string)[MAX_DIGITS+1]) const throw() 
		{ 
			uint digits = 0; 
 
			if (Core::Peripherals::BarcodeReader* const barcodeReader = Query()) 
			{ 
				static uint extra = 0x1234; 
				std::srand( std::time(NULL) + extra++ ); 
 
				if (!barcodeReader->IsDigitsSupported( MIN_DIGITS )) 
				{ 
					digits = MAX_DIGITS; 
				} 
				else if (barcodeReader->IsDigitsSupported( MAX_DIGITS ) && (std::rand() & 0x1U)) 
				{ 
					digits = MAX_DIGITS; 
				} 
				else 
				{ 
					digits = MIN_DIGITS; 
				} 
 
				uint sum = 0; 
 
				for (uint i=0; i < digits-1; ++i) 
				{ 
					const uint digit = uint(std::rand()) / (RAND_MAX / 10 + 1); 
					string[i] = '0' + digit; 
					sum += (i & 1) ? (digit * 3) : (digit * 1); 
				} 
 
				string[digits-1] = '0' + (10 - sum % 10) % 10; 
			} 
 
			string[digits] = '\0'; 
 
			return digits; 
		} 
 
		bool BarcodeReader::IsDigitsSupported(uint count) const throw() 
		{ 
			if (Core::Peripherals::BarcodeReader* const barcodeReader = Query()) 
				return barcodeReader->IsDigitsSupported( count ); 
 
			return false; 
		} 
 
		bool BarcodeReader::CanTransfer() const throw() 
		{ 
			return !emulator.tracker.IsLocked() && Query(); 
		} 
 
		Result BarcodeReader::Transfer(const char* string,uint length) throw() 
		{ 
			if (!emulator.tracker.IsLocked()) 
			{ 
				if (Core::Peripherals::BarcodeReader* const barcodeReader = Query()) 
					return emulator.tracker.TryResync( barcodeReader->Transfer( string, length ) ? RESULT_OK : RESULT_ERR_INVALID_PARAM ); 
			} 
 
			return RESULT_ERR_NOT_READY; 
		} 
 
		#ifdef NST_MSVC_OPTIMIZE 
		#pragma optimize("", on) 
		#endif 
	} 
}