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/*
  Copyright (c) 2007-2010 Gluster, Inc. <http://www.gluster.com>
  This file is part of GlusterFS.

  GlusterFS is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 3 of the License,
  or (at your option) any later version.

  GlusterFS is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/


#include "xdr-generic.h"


ssize_t
xdr_serialize_generic (struct iovec outmsg, void *res, xdrproc_t proc)
{
        ssize_t ret = -1;
        XDR     xdr;

        if ((!outmsg.iov_base) || (!res) || (!proc))
                return -1;

        xdrmem_create (&xdr, outmsg.iov_base, (unsigned int)outmsg.iov_len,
                       XDR_ENCODE);

        if (!proc (&xdr, res)) {
                ret = -1;
                goto ret;
        }

        ret = xdr_encoded_length (xdr);

ret:
        return ret;
}


ssize_t
xdr_to_generic (struct iovec inmsg, void *args, xdrproc_t proc)
{
        XDR     xdr;
        ssize_t ret = -1;

        if ((!inmsg.iov_base) || (!args) || (!proc))
                return -1;

        xdrmem_create (&xdr, inmsg.iov_base, (unsigned int)inmsg.iov_len,
                       XDR_DECODE);

        if (!proc (&xdr, args)) {
                ret  = -1;
                goto ret;
        }

        ret = xdr_decoded_length (xdr);
ret:
        return ret;
}


ssize_t
xdr_to_generic_payload (struct iovec inmsg, void *args, xdrproc_t proc,
                        struct iovec *pendingpayload)
{
        XDR     xdr;
        ssize_t ret = -1;

        if ((!inmsg.iov_base) || (!args) || (!proc))
                return -1;

        xdrmem_create (&xdr, inmsg.iov_base, (unsigned int)inmsg.iov_len,
                       XDR_DECODE);

        if (!proc (&xdr, args)) {
                ret  = -1;
                goto ret;
        }

        ret = xdr_decoded_length (xdr);

        if (pendingpayload) {
                pendingpayload->iov_base = xdr_decoded_remaining_addr (xdr);
                pendingpayload->iov_len = xdr_decoded_remaining_len (xdr);
        }

ret:
        return ret;
}

ssize_t
xdr_length_round_up (size_t len, size_t bufsize)
{
        int     roundup = 0;

        roundup = len % XDR_BYTES_PER_UNIT;
        if (roundup > 0)
                roundup = XDR_BYTES_PER_UNIT - roundup;

        if ((roundup > 0) && ((roundup + len) <= bufsize))
                len += roundup;

        return len;
}

int
xdr_bytes_round_up (struct iovec *vec, size_t bufsize)
{
        vec->iov_len = xdr_length_round_up (vec->iov_len, bufsize);
        return 0;
}


void
xdr_vector_round_up (struct iovec *vec, int vcount, uint32_t count)
{
        uint32_t round_count = 0;

        round_count = xdr_length_round_up (count, 1048576);
        round_count -= count;
        if (round_count == 0)
                return;

        vec[vcount-1].iov_len += round_count;
}