C++ (Cpp) snmp_pbuf_stream_writebuf Examples

Example #1

File: snmp_pbuf_stream.c Project: geliang201201/lwip

err_t
snmp_pbuf_stream_writeto(struct snmp_pbuf_stream* pbuf_stream, struct snmp_pbuf_stream* target_pbuf_stream, u16_t len)
{
  if ((pbuf_stream == NULL) || (target_pbuf_stream == NULL)) {
    return ERR_ARG;
  }
  if ((len > pbuf_stream->length) || (len > target_pbuf_stream->length)) {
    return ERR_ARG;
  }

  if (len == 0) {
    len = LWIP_MIN(pbuf_stream->length, target_pbuf_stream->length);
  }

  while (len > 0) {
    u16_t chunk_len;
    err_t err;

    if (pbuf_stream->pbuf_len == 0) {
      /* we are at the end of current pbuf, skip to next */
      pbuf_stream->pbuffer = pbuf_stream->pbuffer->next;
    
      if ((pbuf_stream->pbuffer == NULL) || (pbuf_stream->pbuffer->len == 0)) {
        return ERR_BUF;
      }
    
      pbuf_stream->pbuf_len = pbuf_stream->pbuffer->len;
      pbuf_stream->pData    = (u8_t*)(pbuf_stream->pbuffer->payload);
    }

    chunk_len = LWIP_MIN(len, pbuf_stream->pbuf_len);
    err = snmp_pbuf_stream_writebuf(target_pbuf_stream, pbuf_stream->pData, chunk_len);
    if (err != ERR_OK) {
      return err;
    }

    pbuf_stream->pData    += chunk_len;
    pbuf_stream->pbuf_len -= chunk_len;
    pbuf_stream->offset   += chunk_len;
    pbuf_stream->length   -= chunk_len;
    len -= chunk_len;
  }

  return ERR_OK;
}

Example #2

File: lwip_snmp_pbuf_stream.c Project: 0xc0170/mbed

err_t
snmp_pbuf_stream_writeto(struct snmp_pbuf_stream *pbuf_stream, struct snmp_pbuf_stream *target_pbuf_stream, u16_t len)
{

  if ((pbuf_stream == NULL) || (target_pbuf_stream == NULL)) {
    return ERR_ARG;
  }
  if ((len > pbuf_stream->length) || (len > target_pbuf_stream->length)) {
    return ERR_ARG;
  }

  if (len == 0) {
    len = LWIP_MIN(pbuf_stream->length, target_pbuf_stream->length);
  }

  while (len > 0) {
    u16_t chunk_len;
    err_t err;
    u16_t target_offset;
    struct pbuf *pbuf = pbuf_skip(pbuf_stream->pbuf, pbuf_stream->offset, &target_offset);

    if ((pbuf == NULL) || (pbuf->len == 0)) {
      return ERR_BUF;
    }

    chunk_len = LWIP_MIN(len, pbuf->len);
    err = snmp_pbuf_stream_writebuf(target_pbuf_stream, &((u8_t *)pbuf->payload)[target_offset], chunk_len);
    if (err != ERR_OK) {
      return err;
    }

    pbuf_stream->offset   += chunk_len;
    pbuf_stream->length   -= chunk_len;
    len -= chunk_len;
  }

  return ERR_OK;
}

Example #3

File: lwip_snmp_pbuf_stream.c Project: 0xc0170/mbed

err_t
snmp_pbuf_stream_write(struct snmp_pbuf_stream *pbuf_stream, u8_t data)
{
  return snmp_pbuf_stream_writebuf(pbuf_stream, &data, 1);
}