source: trunk/src/ifd/proto-escape.c @ 964

/*
 * Escape protocol - simply pass everything to the reader driver's escape()
 *
 * This is required for exporting access to vendor-specific CCID extensions,
 * such as the Omnikey CardMan 5121 RFID support.
 *
 * The higher-level applications select a virtual slot (the last available slot
 * number).  This virtual slot will automatically get the IFD_PROTOCOL_ESCAPE 
 * assgigned to it and can then be used to transceive() data to/from the CCID.
 *
 * It's a bit ugly, but I was unable to come up with something cleaner.
 *
 * Copyright (C) 2005, Harald Welte <laforge@gnumonks.org>
 */

#include "internal.h"
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

static int escape_init(ifd_protocol_t * prot)
{
        ifd_reader_t *reader = prot->reader;
        const ifd_driver_t *drv;

        if (!reader || !(drv = reader->driver)
            || !drv->ops || !drv->ops->escape)
                return -1;
        return 0;
}

static void escape_release(ifd_protocol_t * prot)
{
        /* NOP */
}

static int escape_set_param(ifd_protocol_t * prot, int type, long value)
{
        ct_error("set_pameter not supported");
        return -1;
}

static int escape_get_param(ifd_protocol_t * prot, int type, long *result)
{
        ct_error("get_pameter not supported");
        return -1;
}

static int
escape_transceive(ifd_protocol_t * prot, int dad,
                  const void *sbuf, size_t slen, void *rbuf, size_t rlen)
{
        ifd_reader_t *reader = prot->reader;
        const ifd_driver_t *drv = reader->driver;

        return drv->ops->escape(reader, dad, sbuf, slen, rbuf, rlen);
}

struct ifd_protocol_ops ifd_protocol_esc = {
        IFD_PROTOCOL_ESCAPE,    /* id */
        "escape",               /* name */
        sizeof(ifd_protocol_t), /* size */
        escape_init,            /* init */
        escape_release,         /* release */
        escape_set_param,       /* set_param */
        escape_get_param,       /* get_param */
        NULL,                   /* resynchronize */
        escape_transceive,      /* transceive */
        NULL,                   /* sync_read */
        NULL,                   /* sync_write */
};