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IOB: Add iob_clone()
This commit is contained in:
Gregory Nutt
@@ -157,6 +157,16 @@ int iob_copyin(FAR struct iob_s *iob, FAR const uint8_t *src,
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int iob_copyout(FAR uint8_t *dest, FAR const struct iob_s *iob,
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unsigned int len, unsigned int offset);
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/****************************************************************************
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* Name: iob_clone
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*
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* Description:
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* Duplicate (and pack) the data in iob1 in iob2. iob2 must be empty.
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*
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****************************************************************************/
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int iob_clone(FAR struct iob_s *iob1, FAR struct iob_s *iob2);
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/****************************************************************************
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* Name: iob_concat
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*
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+3
-3
@@ -40,9 +40,9 @@ ifeq ($(CONFIG_NET_IOB),y)
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# Include IOB src files
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NET_CSRCS += iob_alloc.c iob_concat.c iob_copyin.c iob_copyout.c iob_free.c
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NET_CSRCS += iob_freeq.c iob_initialize.c iob_pack.c iob_trimhead.c
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NET_CSRCS += iob_trimtail.c
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NET_CSRCS += iob_alloc.c iob_clone.c iob_concat.c iob_copyin.c iob_copyout.c
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NET_CSRCS += iob_free.c iob_freeq.c iob_initialize.c iob_pack.c
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NET_CSRCS += iob_trimhead.c iob_trimtail.c
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# Include iob build support
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@@ -0,0 +1,190 @@
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/****************************************************************************
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* net/iob1/iob_copy.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <queue.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/net/iob.h>
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#include "iob.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef MIN
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# define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_clone
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*
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* Description:
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* Duplicate (and pack) the data in iob1 in iob2. iob2 must be empty.
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*
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****************************************************************************/
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int iob_clone(FAR struct iob_s *iob1, FAR struct iob_s *iob2)
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{
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FAR uint8_t *src;
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FAR uint8_t *dest;
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unsigned int ncopy;
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unsigned int avail1;
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unsigned int avail2;
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unsigned int offset1;
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unsigned int offset2;
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DEBUGASSERT(iob2->io_len == 0 && iob2->io_offset == 0 &&
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iob2->io_pktlen == 0 && iob2->io_link.flink == NULL);
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/* Copy the header information */
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iob2->io_flags = iob1->io_flags;
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iob2->io_pktlen = iob1->io_pktlen;
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iob2->io_priv = iob1->io_priv;
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/* Handle special case where there are empty buffers at the head
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* the the list.
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*/
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while (iob1->io_len <= 0)
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{
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iob1 = (FAR struct iob_s *)iob1->io_link.flink;
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}
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/* Pack each entry from iob1 to iob2 */
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offset1 = 0;
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offset2 = 0;
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while (iob1)
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{
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/* Get the source I/O buffer pointer and the number of bytes to copy
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* from this address.
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*/
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src = &iob1->io_data[iob1->io_offset + offset1];
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avail1 = iob1->io_len - offset1;
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/* Get the destination I/O buffer pointer and the number of bytes to
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* copy to that address.
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*/
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dest = &iob2->io_data[offset2];
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avail2 = CONFIG_IOB_BUFSIZE - offset2;
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/* Copy the smaller of the two and update the srce and destination
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* offsets.
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*/
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ncopy = MIN(avail1, avail2);
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memcpy(dest, src, ncopy);
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offset1 += ncopy;
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offset2 += ncopy;
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/* Have we taken all of the data from the source I/O buffer? */
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if (offset1 >= iob1->io_len)
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{
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/* Skip over empty entries in the chain (there should not be any
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* but just to be safe).
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*/
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do
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{
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/* Yes.. move to the next source I/O buffer */
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iob1 = (FAR struct iob_s *)iob1->io_link.flink;
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}
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while (iob1->io_len <= 0);
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/* Reset the offset to the beginning of the I/O buffer */
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offset1 = 0;
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}
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/* Have we filled the destination I/O buffer? Is there more data to be
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* transferred?
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*/
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if (offset2 >= CONFIG_IOB_BUFSIZE && iob1 != NULL)
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{
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FAR struct iob_s *next;
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/* Allocate new destination I/O buffer and hook it into the
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* destination I/O buffer chain.
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*/
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next = iob_alloc();
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if (!next)
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{
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ndbg("Failed to allocate an I/O buffer/n");
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return -ENOMEM;
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}
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iob2->io_link.flink = &next->io_link;
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iob2 = next;
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offset2 = 0;
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}
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}
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return 0;
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}
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