#include <stdlib.h>

#include <string.h>

#include <glib.h>

#include "vcardt.h"

#include "vcardt_internal.h"

/* create an ATR with appropriate historical bytes */

#define ATR_TS_DIRECT_CONVENTION 0x3b

#define ATR_TA_PRESENT 0x10

#define ATR_TB_PRESENT 0x20

#define ATR_TC_PRESENT 0x40

#define ATR_TD_PRESENT 0x80

unsigned char *vcard_alloc_atr(const char *postfix, int *atr_len)

{

    int postfix_len;

    const char prefix[] = "VCARD_";

    const char default_postfix[] = "DEFAULT";

    const int prefix_len = sizeof(prefix) - 1;

    int total_len;

    unsigned char *atr;

    if (postfix == NULL) {

        postfix = default_postfix;

    }

    postfix_len = strlen(postfix);

    total_len = 3 + prefix_len + postfix_len;

    atr = g_malloc(total_len);

    atr[0] = ATR_TS_DIRECT_CONVENTION;

    atr[1] = ATR_TD_PRESENT + prefix_len + postfix_len;

    atr[2] = 0x00;

    memcpy(&atr[3], prefix, prefix_len);

    memcpy(&atr[3 + prefix_len], postfix, postfix_len);

    if (atr_len) {

        *atr_len = total_len;

    }

    return atr;

}