gui_uc_encodeutf8.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 uC/GUI
*   					 Universal graphic software for embedded applications
*
*   					(c) Copyright 2002, Micrium Inc., Weston, FL
*   					(c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*   		   礐/GUI is protected by international copyright laws. Knowledge of the
*   		   source code may not be used to write a similar product. This file may
*   		   only be used in accordance with a license and should not be redistributed
*   		   in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File		: GUI_UC_EncodeUTF8.c
Purpose 	: Encoding routines
---------------------------END-OF-HEADER------------------------------
*/

#include "GUI_Protected.h"

/*********************************************************************
*
*   	Static code
*
**********************************************************************
*/
/*********************************************************************
*
*   	_GetCharCode
*
* Purpose:
*   Return the UNICODE character code of the current character.
*/
static U16 _GetCharCode(const char GUI_UNI_PTR *s)
{
	U16 r;
	U8 Char = *(const U8 *) s;
	if ((Char & 0x80) == 0)
	{
		/* Single byte (ASCII)  */
		r = Char;
	}
	else if ((Char & 0xe0) == 0xc0)
	{
		/* Double byte sequence */
		r = (Char & 0x1f) << 6;
		Char = *(++s);
		Char &= 0x3f;
		r |= Char;
	}
	else if ((Char & 0xf0) == 0xe0)
	{
		/* 3 byte sequence  	*/
		r = (Char & 0x0f) << 12;
		Char = *(++s);
		Char &= 0x3f;
		r |= (Char << 6);
		Char = *(++s);
		Char &= 0x3f;
		r |= Char;
	}
	else
	{
		GUI_DEBUG_ERROROUT("Illegal character during UTF-8 decoding!");
		r = 1;  	 /* Illegal character. To avoid endless loops in upper layers, we return 1 rather than 0. */
	}
	return r;
}

/*********************************************************************
*
*   	_GetCharSize
*
* Purpose:
*   Return the number of bytes of the current character.
*/
static int _GetCharSize(const char GUI_UNI_PTR *s)
{
	U8 Char = *s;
	if ((Char & 0x80) == 0)
	{
		return 1;
	}
	else if ((Char & 0xe0) == 0xc0)
	{
		return 2;
	}
	else if ((Char & 0xf0) == 0xe0)
	{
		return 3;
	}
	GUI_DEBUG_ERROROUT("Illegal character during UTF-8 decoding!");
	return 1;   	/* Illegal character. To avoid endless loops in upper layers, we return 1 rather than 0. */
}

/*********************************************************************
*
*   	_CalcSizeOfChar
*
* Purpose:
*   Return the number of bytes needed for the given character.
*/
static int _CalcSizeOfChar(U16 Char)
{
	int r;
	if (Char & 0xF800)
	{
		/* Single byte (ASCII)  */
		r = 3;
	}
	else if (Char & 0xFF80)
	{
		/* Double byte sequence */
		r = 2;
	}
	else
	{
		/* 3 byte sequence  	*/
		r = 1;
	}
	return r;
}

/*********************************************************************
*
*   	_Encode
*
* Purpose:
*   Encode character into 1/2/3 bytes.
*/
static int _Encode(char *s, U16 Char)
{
	int r;
	r = _CalcSizeOfChar(Char);
	switch (r)
	{
		case 1:
			*s = (char) Char;
			break;
		case 2:
			*s++ = 0xC0 | (Char >> 6);
			*s = 0x80 | (Char & 0x3F);
			break;
		case 3:
			*s++ = 0xE0 | (Char >> 12);
			*s++ = 0x80 | ((Char >> 6) & 0x3F);
			*s = 0x80 | (Char & 0x3F);
			break;
	}
	return r;
}

/*********************************************************************
*
*   	_API_Table
*/
static const GUI_UC_ENC_APILIST _API_Table = {
_GetCharCode, 	/*  return character code as U16 (Unicode) */
_GetCharSize, 	/*  return size of character: 1/2/3 	   */
_CalcSizeOfChar,  /*  return size of character: 1/2/3 	   */
_Encode   		/*  Encode character into 1/2/3 bytes      */
};

/*********************************************************************
*
*   	Exported code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI_UC_SetEncodeUTF8
*/
void GUI_UC_SetEncodeUTF8(void)
{
	GUI_LOCK();
	GUI_Context.pUC_API = &_API_Table;
	GUI_UNLOCK();
}

/*************************** End of file ****************************/