164 lines
4.5 KiB
C
164 lines
4.5 KiB
C
/****************************************************************************
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* mm/iob/iob_clone.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/mm/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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* 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, bool throttled,
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enum iob_user_e consumerid)
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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_flink == NULL);
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/* Copy the total packet size from the I/O buffer at the head of the
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* chain.
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*/
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iob2->io_pktlen = iob1->io_pktlen;
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/* Handle special case where there are empty buffers at the head
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* the list.
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*/
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while (iob1->io_len <= 0)
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{
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iob1 = iob1->io_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 = iob1->io_flink;
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}
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while (iob1 && 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(throttled, consumerid);
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if (!next)
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{
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ioberr("ERROR: Failed to allocate an I/O buffer\n");
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return -ENOMEM;
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}
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iob2->io_flink = next;
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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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