hexa.c

来自「一个免费的SMART CARD OS系统。」· C语言 代码 · 共 153 行

/* ============================================================================
   Project Name : jayaCard TCK
   Module Name  : proto/tck/common/hexa.c
   Version : $Id: hexa.c,v 1.6 2004/01/11 09:56:34 dgil Exp $

	Description: common sources for hexa manipulation

    The Original Code is jayaCard TCK code.

    The Initial Developer of the Original Code is Gilles Dumortier

	Portions created by the Initial Developer are Copyright (C) 2002-2004 the
    Initial Developer. All Rights Reserved.

    Contributor(s): Philippe Fremy ([e-mail])

	Permission is granted to any individual to use, copy, or redistribute
	this software so long as all of the original files are included
	unmodified, that it is not sold for profit, and that this copyright
	notice is retained.

    This program 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.

   History Rev	Description
   022303 dgil	wrote it from reader.c
		  		add string manipulation
   ============================================================================
*/

#include "precomp.h"

/* ============================================================================
	hexa2byte()

	note that c2 can be \0
   ========================================================================= */

jbyte hexa2byte(char c1,char c2)
{
	jbyte b = 0x00;

	if ((c1>='0') && (c1<='9')) {
		b = (c1 - '0')<<4;
	}
	if ((c1>='a') && (c1<='f')) {
		b = (c1 - 'a' + 10)<<4;
	}
	if ((c1>='A') && (c1<='F')) {
		b = (c1 - 'A' + 10)<<4;
	}
	if ((c2>='0') && (c2<='9')) {
		b |= (c2 - '0');
	}
	if ((c2>='a') && (c2<='f')) {
		b |= (c2 - 'a' + 10);
	}
	if ((c2>='A') && (c2<='F')) {
		b |= (c2 - 'A' + 10);
	}

	/* LOG5("HEXA","0x%.2X 0x%.2X %c%c 0x%.2X ",c1,c2,c1,c2,b); */

	return b;
}

/* ============================================================================
	hexa2bytes()

	warning: buf must be correctly sized to receive all the bytes.
   ========================================================================= */

jword hexa2bytes(jbyte* buf,char *str)
{
	jword	len = 0;

	while (*str!='\0') {
		while (isspace(*str)) { str++; }
		buf[len] = hexa2byte(str[0],str[1]);
		str +=2;
		len++;
	}

	return len;
}

/* ============================================================================
	byte2hexa()

	fill 3 chars with each hexadecimal digits then '\0'
   ========================================================================= */

static jbyte __byte[] = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };

void byte2hexa(jbyte b,char* s)
{
	s[0] = __byte[b>>4];
	s[1] = __byte[b&0x0F];
	s[2] = '\0';
}

/* ============================================================================
	bytes2hexa()

	warning: str must be correctly sized to receive all the characters.
   ========================================================================= */

void bytes2hexa(char* str,jbyte* buf,jword len,char sep)
{
	jword	i = 0;

	*str = '\0';
	while (i<len) {
		byte2hexa(buf[i],str);
		str += 2;
		i++;
		if ((sep!='\0') && (i<len)) { *str++ = sep; *str = '\0'; }
	}
}

/* ============================================================================
	That's all folks !
   ========================================================================= */

#ifdef TEST_HEXA
#include <stdio.h>

int main()
{
	char s[1024];
	jbyte b;
	jbyte tab[10];
	int i;

	b = 4;
	byte2hexa( b, s );
	printf("byte2hexa %x: '%s'\n", b, s );

	b = 64;
	byte2hexa( b, s );
	printf("byte2hexa %x: '%s'\n", b, s );

	for( i=0; i<10; i++) tab[i] = i;
	bytes2hexa( s, tab, 10, '\0' );
	printf("bytes2hexa : '%s'\n", s );


	return 0;
}
#endif