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/****************************************************************************
* net/iob1/iob_copy.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_DEBUG) && defined(CONFIG_IOB_DEBUG)
/* Force debug output (from this file only) */
# undef CONFIG_DEBUG_NET
# define CONFIG_DEBUG_NET 1
#endif
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/net/iob.h>
#include "iob.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef MIN
# define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: iob_clone
*
* Description:
* Duplicate (and pack) the data in iob1 in iob2. iob2 must be empty.
*
****************************************************************************/
int iob_clone(FAR struct iob_s *iob1, FAR struct iob_s *iob2, bool throttled)
{
FAR uint8_t *src;
FAR uint8_t *dest;
unsigned int ncopy;
unsigned int avail1;
unsigned int avail2;
unsigned int offset1;
unsigned int offset2;
DEBUGASSERT(iob2->io_len == 0 && iob2->io_offset == 0 &&
iob2->io_pktlen == 0 && iob2->io_flink == NULL);
/* Copy the total packet size from the I/O buffer at the head of the chain */
iob2->io_pktlen = iob1->io_pktlen;
/* Handle special case where there are empty buffers at the head
* the the list.
*/
while (iob1->io_len <= 0)
{
iob1 = iob1->io_flink;
}
/* Pack each entry from iob1 to iob2 */
offset1 = 0;
offset2 = 0;
while (iob1)
{
/* Get the source I/O buffer pointer and the number of bytes to copy
* from this address.
*/
src = &iob1->io_data[iob1->io_offset + offset1];
avail1 = iob1->io_len - offset1;
/* Get the destination I/O buffer pointer and the number of bytes to
* copy to that address.
*/
dest = &iob2->io_data[offset2];
avail2 = CONFIG_IOB_BUFSIZE - offset2;
/* Copy the smaller of the two and update the srce and destination
* offsets.
*/
ncopy = MIN(avail1, avail2);
memcpy(dest, src, ncopy);
offset1 += ncopy;
offset2 += ncopy;
/* Have we taken all of the data from the source I/O buffer? */
if (offset1 >= iob1->io_len)
{
/* Skip over empty entries in the chain (there should not be any
* but just to be safe).
*/
do
{
/* Yes.. move to the next source I/O buffer */
iob1 = iob1->io_flink;
}
while (iob1->io_len <= 0);
/* Reset the offset to the beginning of the I/O buffer */
offset1 = 0;
}
/* Have we filled the destination I/O buffer? Is there more data to be
* transferred?
*/
if (offset2 >= CONFIG_IOB_BUFSIZE && iob1 != NULL)
{
FAR struct iob_s *next;
/* Allocate new destination I/O buffer and hook it into the
* destination I/O buffer chain.
*/
next = iob_alloc(throttled);
if (!next)
{
ndbg("Failed to allocate an I/O buffer/n");
return -ENOMEM;
}
iob2->io_flink = next;
iob2 = next;
offset2 = 0;
}
}
return 0;
}
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