/* $Id: atr.c,v 1.6 2001/07/02 20:07:07 rees Exp $ */

/*
copyright 1997, 1999, 2000, 2001
the regents of the university of michigan
all rights reserved

permission is granted to use, copy, create derivative works 
and redistribute this software and such derivative works 
for any purpose, so long as the name of the university of 
michigan is not used in any advertising or publicity 
pertaining to the use or distribution of this software 
without specific, written prior authorization.  if the 
above copyright notice or any other identification of the 
university of michigan is included in any copy of any 
portion of this software, then the disclaimer below must 
also be included.

this software is provided as is, without representation 
from the university of michigan as to its fitness for any 
purpose, and without warranty by the university of 
michigan of any kind, either express or implied, including 
without limitation the implied warranties of 
merchantability and fitness for a particular purpose. the 
regents of the university of michigan shall not be liable 
for any damages, including special, indirect, incidental, or 
consequential damages, with respect to any claim arising 
out of or in connection with the use of the software, even 
if it has been or is hereafter advised of the possibility of 
such damages.
*/

/*
 * Parse smart card atr, return proto params
 *
 * Jim Rees, University of Michigan CITI
 */

#ifdef __palmos__
#include <Common.h>
#include <System/SysAll.h>
#include <System/MemoryMgr.h>
#include <System/Unix/unix_stdlib.h>
#include <UI/UIAll.h>
#include "field.h"
typedef long int32_t;
#else
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#endif

#include "sc7816.h"

/* Global interface bytes */
#define TA1 (tpb[0][0])
#define TB1 (tpb[0][1])
#define TC1 (tpb[0][2])
#define TD1 (tpb[0][3])
#define TC2 (tpb[1][2])
#define TA2 (tpb[1][0])

/* Inversion table, for inverse convention */
unsigned char scinvert[] = {
    0xff, 0x7f, 0xbf, 0x3f, 0xdf, 0x5f, 0x9f, 0x1f,
    0xef, 0x6f, 0xaf, 0x2f, 0xcf, 0x4f, 0x8f, 0x0f,
    0xf7, 0x77, 0xb7, 0x37, 0xd7, 0x57, 0x97, 0x17,
    0xe7, 0x67, 0xa7, 0x27, 0xc7, 0x47, 0x87, 0x07,
    0xfb, 0x7b, 0xbb, 0x3b, 0xdb, 0x5b, 0x9b, 0x1b,
    0xeb, 0x6b, 0xab, 0x2b, 0xcb, 0x4b, 0x8b, 0x0b,
    0xf3, 0x73, 0xb3, 0x33, 0xd3, 0x53, 0x93, 0x13,
    0xe3, 0x63, 0xa3, 0x23, 0xc3, 0x43, 0x83, 0x03,
    0xfd, 0x7d, 0xbd, 0x3d, 0xdd, 0x5d, 0x9d, 0x1d,
    0xed, 0x6d, 0xad, 0x2d, 0xcd, 0x4d, 0x8d, 0x0d,
    0xf5, 0x75, 0xb5, 0x35, 0xd5, 0x55, 0x95, 0x15,
    0xe5, 0x65, 0xa5, 0x25, 0xc5, 0x45, 0x85, 0x05,
    0xf9, 0x79, 0xb9, 0x39, 0xd9, 0x59, 0x99, 0x19,
    0xe9, 0x69, 0xa9, 0x29, 0xc9, 0x49, 0x89, 0x09,
    0xf1, 0x71, 0xb1, 0x31, 0xd1, 0x51, 0x91, 0x11,
    0xe1, 0x61, 0xa1, 0x21, 0xc1, 0x41, 0x81, 0x01,
    0xfe, 0x7e, 0xbe, 0x3e, 0xde, 0x5e, 0x9e, 0x1e,
    0xee, 0x6e, 0xae, 0x2e, 0xce, 0x4e, 0x8e, 0x0e,
    0xf6, 0x76, 0xb6, 0x36, 0xd6, 0x56, 0x96, 0x16,
    0xe6, 0x66, 0xa6, 0x26, 0xc6, 0x46, 0x86, 0x06,
    0xfa, 0x7a, 0xba, 0x3a, 0xda, 0x5a, 0x9a, 0x1a,
    0xea, 0x6a, 0xaa, 0x2a, 0xca, 0x4a, 0x8a, 0x0a,
    0xf2, 0x72, 0xb2, 0x32, 0xd2, 0x52, 0x92, 0x12,
    0xe2, 0x62, 0xa2, 0x22, 0xc2, 0x42, 0x82, 0x02,
    0xfc, 0x7c, 0xbc, 0x3c, 0xdc, 0x5c, 0x9c, 0x1c,
    0xec, 0x6c, 0xac, 0x2c, 0xcc, 0x4c, 0x8c, 0x0c,
    0xf4, 0x74, 0xb4, 0x34, 0xd4, 0x54, 0x94, 0x14,
    0xe4, 0x64, 0xa4, 0x24, 0xc4, 0x44, 0x84, 0x04,
    0xf8, 0x78, 0xb8, 0x38, 0xd8, 0x58, 0x98, 0x18,
    0xe8, 0x68, 0xa8, 0x28, 0xc8, 0x48, 0x88, 0x08,
    0xf0, 0x70, 0xb0, 0x30, 0xd0, 0x50, 0x90, 0x10,
    0xe0, 0x60, 0xa0, 0x20, 0xc0, 0x40, 0x80, 0x00,
};

/* 7816-3 1997 Table 7, 8 */
static short Ftab[] = { 372, 372, 558,  744, 1116, 1488, 1860, -1,
		  -1, 512, 768, 1024, 1536, 2048,   -1, -1 };
static short Dtab[] = { -1, 1, 2, 4, 8, 16, 32, -1, 12, 20, -1, -1, -1, -1, -1, -1 };

/*
 * Table generated by mkFDtab.
 */

static struct bps {
    unsigned char Fi, Di;
    int32_t bps;
} bps[] = {
    { 0x01, 0x08, 115464 },
    { 0x09, 0x05, 111856 },
    { 0x0b, 0x06, 111840 },
    { 0x03, 0x08,  57732 },
    { 0x09, 0x04,  55928 },
    { 0x0a, 0x08,  55920 },
    { 0x0b, 0x05,  55920 },
    { 0x0d, 0x06,  55904 },
    { 0x03, 0x04,  38488 },
    { 0x01, 0x03,  38488 },
    { 0x04, 0x08,  38484 },
    { 0x06, 0x09,  38480 },
    { 0x05, 0x05,  38480 },
    { 0x0a, 0x04,  37280 },
    { 0x0c, 0x05,  37280 },
    { 0x05, 0x08,  28860 },
    { 0x09, 0x03,  27964 },
    { 0x0c, 0x08,  27960 },
    { 0x0b, 0x04,  27960 },
    { 0x0d, 0x05,  27952 },
    { 0x06, 0x08,  23088 },
    { 0x01, 0x02,  19244 },
    { 0x03, 0x03,  19244 },
    { 0x05, 0x04,  19240 },
    { 0x0a, 0x03,  18640 },
    { 0x0c, 0x04,  18640 },
    { 0x09, 0x02,  13982 },
    { 0x0b, 0x03,  13980 },
    { 0x0d, 0x04,  13976 },
    { 0x02, 0x02,  12828 },
    { 0x04, 0x03,  12828 },
    { 0, 0, 0 }
};


int
parse_atr(int ttyn, int flags, unsigned char *atr, int len, struct scparam *param)
{
    int i, c, t, ts, t0, tck, nhb, pbn;
    int F, D, Fi, Di, N, etu, WI;
    unsigned char *ap, *hb;
    unsigned char tpb[8][4];
    int hiproto = 0;

    ap = atr;

    if (atr[0] == 0x3) {
	if (flags & SCRV)
	    printf("inverse conversion\n");
	for (i = 0; i < len; i++)
	    atr[i] = scinvert[atr[i]];
    }

    ts = *ap++;

    if (flags & SCRV) {
	for (i = 0; i < len; i++)
	    printf("%d:%x ", i + 1, atr[i]);
	printf("\n");
    }

    if (ts != 0x3b && ts != 0x3f) {
	if (flags & SCRV)
	    printf("TS=%02x (not default timing)\n", ts);
	param->t = -1;
	return len;
    }
    t0 = *ap++;
    nhb = t0 & 0xf;

    /* Fill in defaults */
    TA1 = 0x11;
    TB1 = 0x4d;
    TC1 = 0x00;
    TC2 = 10;
    TA2 = 0xff;
    TD1 = 0;

    Fi = 1;
    Di = 1;

    /* Get up to 8 sets of protocol bytes */
    for (i = 0; i < 8; i++) {
	tpb[i][3] = 0;
	for (pbn = 0; pbn < 4; pbn++) {
	    /* If T0 (or TD(i)) indicates presence of proto byte, get it */
	    if (t0 & (1 << (4 + pbn)))
		tpb[i][pbn] = *ap++;
	}
	t = tpb[i][3] & 0xf;
	if (t > hiproto)
	    hiproto = t;

	if (flags & SCRV) {
	    printf("proto %d T=%d", i + 1, t);
	    for (pbn = 0; pbn < 4; pbn++)
		if (t0 & (1 << (4 + pbn)))
		    printf(" T%c%d=%02x", 'A' + pbn, i + 1, tpb[i][pbn]);
	    printf("\n");
	}

	t0 = tpb[i][3];
	if (!(t0 & 0xf0))
	    break;
    }

    if (nhb) {
	hb = ap;
	ap += nhb;
    }

    if (nhb && (flags & SCRV)) {
	printf("%d historical bytes:", nhb);
	for (i = 0; i < nhb; i++) {
	    c = hb[i];
	    if (c >= ' ' && c <= '~')
		printf(" %c", c);
	    else
		printf(" %02x", c);
	}
	printf("\n");
    }

    if (hiproto > 0)
	ap++;

    if (ap - atr < len && (flags & SCRLEN))
	len = ap - atr;

    if (hiproto > 0) {
	tck = 0;
	for (i = 1; i < len; i++)
	    tck ^= atr[i];
	if (tck != 0 && (flags & SCRV))
	    printf("Checksum failed, TCK=%x sum=%x\n", atr[len-1], tck);
    }

    /* got enough bytes? */

    if (ap - atr != len && (flags & SCRV))
	printf("expected %d proto bytes + %d historical bytes, got %d\n", (int) (ap - atr) - nhb, nhb, len);
    if (ap - atr > len) {
	if (flags & SCRV)
	    printf("atr underrun\n");
	param->t = -1;
	return len;
    }

    /*
     * I'm a little unclear on this.  If TA2 is present, it indicates a specific mode.
     * Else it's negotiable, and starts out with proto 1?
     * 7816-3 6.6.1
     */
    if (TA2 != 0xff)
	t = TA2 & 0xf;
    else
	t = TD1 & 0xf;

    /* Todos reader won't do higher speeds */
    if (!(flags & SCRTODOS)) {
	for (i = 0; bps[i].bps; i++) {
	    if (((TA1 >> 4) & 0xf) >= bps[i].Fi && (TA1 & 0xf) >= bps[i].Di) {
		if (flags & SCRV)
		    printf("speed %ld\n", (long) bps[i].bps);
		Fi = bps[i].Fi;
		Di = bps[i].Di;
		break;
	    }
	}
    }

    F  = Ftab[Fi];
    D  = Dtab[Di];
    N  = TC1;

    /* 1/f = 1/3.579545 ~= 50/179; etu in microsec */
    param->etu = etu = (F * 50L) / (D * 179L);
    param->n = (N < 255) ? N : 0;

    if (flags & SCRV) {
	printf("%d etu = %d F / %d D * 3.58 f\n", etu, F, D);
	if (N)
	    printf("%d N\n", N);
    }

    if (t == 0) {
	WI = TC2;

	/* cwt is in milliseconds */
	param->cwt = (960L * WI * F) / 3580L;
	if ((flags & SCRV) && WI != 10)
	    printf("%d cwt = (960 * %d WI * %d F) / 3.58 f / 1000\n",
		   param->cwt, WI, F);
    } else if (t == 1) {
	/* add 100 to each for engineering safety margin */
	param->cwt = (11L + (1 << (TB1 & 0xf))) * etu / 1000 + 100;
	param->bwt = (11L * etu / 1000L) + ((1 << ((TB1 >> 4) & 0xf)) * 100) + 100;
	if (flags & SCRV)
	    printf("%d cwt, %d bwt\n", param->cwt, param->bwt);
    }
    param->t = t;

    return len;
}