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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
static unsigned int fsdi_table[] = { 16, 24, 32, 40, 48, 64, 96, 128, 256 };
int iso14443_fsdi_to_fsd(unsigned int *fsd, unsigned char fsdi)
{
/* ISO 14443-4:2000(E) Section 5.1. */
if (fsdi > sizeof(fsdi_table)/sizeof(unsigned int))
return -1;
*fsd = fsdi_table[fsdi];
return 0;
}
int iso14443_fsd_to_fsdi(unsigned char *fsdi, unsigned int fsd)
{
int i;
for (i = 0; i < sizeof(fsdi_table)/sizeof(unsigned int); i++) {
if (fsdi_table[i] == fsd) {
*fsdi = i;
return 0;
}
}
return -1;
}
/* calculate the fsd that is equal or the closest smaller value
* that can be coded as fsd */
unsigned int iso14443_fsd_approx(unsigned int fsd)
{
unsigned int tbl_size = sizeof(fsdi_table)/sizeof(unsigned int);
int i;
for (i = tbl_size-1; i >= 0; i--) {
if (fsdi_table[i] <= fsd)
return fsdi_table[i];
}
/* not reached: return smallest possible FSD */
return fsdi_table[0];
}
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