/*
?*?ITF25_Barcode.c
?*
?*??Created?on:?2012-10-25
?*??????Author:?guximiao
?*/

#include?
#include?“ITF25_Barcode.h“

#define?NARROW	0
#define?WIDE	1

const?static?unsigned?char?encoding_table[10][5]?=?
{
	NARROWNARROWWIDEWIDENARROW	//?0
	WIDENARROWNARROWNARROWWIDE	//?1
	NARROWWIDENARROWNARROWWIDE	//?2
	WIDEWIDENARROWNARROWNARROW	//?3
	NARROWNARROWWIDENARROWWIDE	//?4
	WIDENARROWWIDENARROWNARROW	//?5
	NARROWWIDEWIDENARROWNARROW	//?6
	NARROWNARROWNARROWWIDEWIDE	//?7
	WIDENARROWNARROWWIDENARROW	//?8
	NARROWWIDENARROWWIDENARROW	//?9
};

static?unsigned?int?CalcCheckSum（const?unsigned?char?buf[]?unsigned?int?len）;
static?unsigned?int?EncodingSymbol（unsigned?char?barcode[]?unsigned?char?odd?unsigned?char?even）;

int?ITF25_Encoding（unsigned?char?barcode[]?const?char?*str）
{
	unsigned?char?checksum?odd?even;
	unsigned?int?len;
	int?bar_len?=?0;
	
	len?=?strlen（str）;
	if（（len&0x01）?==?1）
	{checksum?=?CalcCheckSum（（unsigned?char?*）str?len）;}
	
	//?起始符?1010
	barcode[bar_len++]?=?0xff;
	barcode[bar_len++]?=?0;
	barcode[bar_len++]?=?0xff;
	barcode[bar_len++]?=?0;
	
	//?編碼
	while（len>1）
	{
		odd?=?*str++?-?‘0‘;
		even?=?*str++?-?‘0‘;
		bar_len?+=?EncodingSymbol（&barcode[bar_len]?odd?even）;
		len?-=?2;
	}
	if（len?==?1）
	{bar_len?+=?EncodingSymbol（&barcode[bar_len]?*str?-?‘0‘?checksum）;}
	
	//?停止符?1101
	barcode[bar_len++]?=?0xff;
	barcode[bar_len++]?=?0xff;
	barcode[bar_len++]?=?0;
	barcode[bar_len++]?=?0xff;
	
	return?bar_len;
}

static?unsigned?int?EncodingSymbol（unsigned?char?barcode[]?unsigned?char?odd?unsigned?char?even）
{
	unsigned?int?ilen;
	
	for（i=0len=0;?i<5;?i++）
	{
		if（encoding_table[odd][i]?==?NARROW）
		{barcode[len++]?=?0xff;}
		else
		{
			barcode[len++]?=?0xff;
			barcode[len++]?=?0xff;
		}
		if（encoding_table[even][i]?==?NARROW）
		{barcode[len++]?=?0;}
		else
		{
			barcode[len++]?=?0;
			barcode[len++]?=?0;
		}
	}
	
	return?len;
}

static?unsigned?int?CalcCheckSum（const?unsigned?char?buf[]?unsigned?int?len）
{
	unsigned?int?checkSum;
	unsigned?int?ipoddeven;
	
	p?=?0;
	for（i=lenodd=0even=0;?i>0;）
	{
		if（p）
		{even?+=?buf[--i]?-?‘0‘;}
		else
		{odd?+=?buf[--i]?-?‘0‘;}
		p?=?!p;
	}
	odd?=?odd?*?（unsigned?int）3;
	checkSum?=?odd?+?even;
	checkSum?%=?（unsigned?int）10;
	if（checkSum）
	{checkSum?=?10?-?checkSum;}
	
	return?checkSum;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????2474??2013-03-02?17:14??ITF25_Barcode\ITF25_Barcode.c

?????文件????????225??2013-03-02?17:13??ITF25_Barcode\ITF25_Barcode.h

?????目錄??????????0??2013-03-02?17:14??ITF25_Barcode

-----------?---------??----------?-----??----

?????????????????2699????????????????????3