159 lines
5.1 KiB
C
159 lines
5.1 KiB
C
/****************************************************************************
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* net/iob/iob_concat.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 <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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/****************************************************************************
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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_concat
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*
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* Description:
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* Concatenate iob_s chain iob2 to iob1.
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*
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****************************************************************************/
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void iob_concat(FAR struct iob_s *iob1, FAR struct iob_s *iob2)
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{
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unsigned int offset2;
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unsigned int ncopy;
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unsigned int navail;
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/* Find the last buffer in the iob1 buffer chain */
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while (iob1->io_link.flink)
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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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/* Then add data to the end of iob1 */
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offset2 = 0;
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while (iob2)
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{
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/* Is the iob1 tail buffer full? */
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if (iob1->io_len >= CONFIG_IOB_BUFSIZE)
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{
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/* Yes.. Just connect the chains */
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iob1->io_link.flink = iob2->io_link.flink;
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/* Has the data offset in iob2? */
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if (offset2 > 0)
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{
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/* Yes, move the data down and adjust the size */
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iob2->io_len -= offset2;
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memcpy(iob2->io_data, &iob2->io_data[offset2], iob2->io_len);
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/* Set up to continue packing, but now into iob2 */
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iob1 = iob2;
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iob2 = (FAR struct iob_s *)iob2->io_link.flink;
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iob1->io_link.flink = NULL;
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offset2 = 0;
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}
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else
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{
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/* Otherwise, we are done */
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return;
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}
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}
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/* How many bytes can we copy from the source (iob2) */
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ncopy = iob2->io_len - offset2;
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/* Limit the size of the copy to the amount of free space in iob1 */
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navail = CONFIG_IOB_BUFSIZE - iob1->io_len;
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if (ncopy > navail)
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{
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ncopy = navail;
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}
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/* Copy the data from iob2 into iob1 */
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memcpy(iob1->io_data + iob1->io_len, iob2->io_data, ncopy);
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iob1->io_len += ncopy;
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offset2 += ncopy;
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/* Have we consumed all of the data in the iob2 entry? */
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if (offset2 >= iob2->io_len)
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{
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/* Yes.. free the iob2 entry and start processing the next I/O
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* buffer in the iob2 chain.
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*/
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iob2 = iob_free(iob2);
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offset2 = 0;
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}
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}
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}
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