mirror of https://gerrit.osmocom.org/simtrace2
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* ISO7816-3 Fi/Di tables + computation
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*
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* (C) 2010-2015 by Harald Welte <laforge@gnumonks.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdint.h>
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#include <errno.h>
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#include "utils.h"
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#include "iso7816_fidi.h"
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/* Table 7 of ISO 7816-3:2006 */
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const uint16_t iso7816_3_fi_table[] = {
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372, 372, 558, 744, 1116, 1488, 1860, 0,
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0, 512, 768, 1024, 1536, 2048, 0, 0
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};
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/* Table 8 from ISO 7816-3:2006 */
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const uint8_t iso7816_3_di_table[] = {
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0, 1, 2, 4, 8, 16, 32, 64,
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12, 20, 2, 4, 8, 16, 32, 64,
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};
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/* compute the F/D ratio based on Fi and Di values */
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int iso7816_3_compute_fd_ratio(uint8_t f_index, uint8_t d_index)
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{
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uint16_t f, d;
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int ret;
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if (f_index >= ARRAY_SIZE(iso7816_3_fi_table) ||
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d_index >= ARRAY_SIZE(iso7816_3_di_table))
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return -EINVAL;
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f = iso7816_3_fi_table[f_index];
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if (f == 0)
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return -EINVAL;
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d = iso7816_3_di_table[d_index];
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if (d == 0)
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return -EINVAL;
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/* See table 7 of ISO 7816-3: From 1000 on we divide by 1/d,
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* which equals a multiplication by d */
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if (d_index < 8)
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ret = f / d;
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else
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ret = f * d;
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return ret;
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}
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