transform_null.c

/* (c) 2009 Richard Andrews <andrews@ntop.org> */

#include "n2n.h"
#include "n2n_transforms.h"
#include "n2n_log.h"



static int transop_deinit_null(n2n_trans_op_t *arg)
{
    /* nothing to deallocate, nothing to release. */
    return 0;
}

static int transop_encode_null(n2n_trans_op_t   *arg,
                               uint8_t          *outbuf,
                               size_t            out_len,
                               const uint8_t    *inbuf,
                               size_t            in_len)
{
    int retval = -1;

    traceDebug("encode_null %lu", in_len);
    if (out_len >= in_len)
    {
        memcpy(outbuf, inbuf, in_len);
        retval = in_len;
    }
    else
    {
        traceDebug("encode_null %lu too big for packet buffer", in_len);
    }

    return retval;
}

static int transop_decode_null(n2n_trans_op_t   *arg,
                               uint8_t          *outbuf,
                               size_t            out_len,
                               const uint8_t    *inbuf,
                               size_t            in_len)
{
    int retval = -1;

    traceDebug("decode_null %lu", in_len);
    if (out_len >= in_len)
    {
        memcpy(outbuf, inbuf, in_len);
        retval = in_len;
    }
    else
    {
        traceDebug("decode_null %lu too big for packet buffer", in_len);
    }

    return retval;
}

static int transop_addspec_null(n2n_trans_op_t *arg, const n2n_cipherspec_t *cspec)
{
    return 0;
}

static n2n_tostat_t transop_tick_null(n2n_trans_op_t *arg, time_t now)
{
    n2n_tostat_t r;

    r.can_tx = 1;
    r.tx_spec.t = N2N_TRANSFORM_ID_NULL;
    r.tx_spec.valid_from = 0;
    r.tx_spec.valid_until = (time_t) (-1);
    r.tx_spec.opaque_size = 0;

    return r;
}

void transop_null_init(n2n_trans_op_t *ttt)
{
    memset(ttt, 0, sizeof(n2n_trans_op_t));

    ttt->transform_id   = N2N_TRANSFORM_ID_NULL;
    ttt->deinit         = transop_deinit_null;
    ttt->addspec        = transop_addspec_null;
    ttt->tick           = transop_tick_null;
    ttt->fwd            = transop_encode_null;
    ttt->rev            = transop_decode_null;
}