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architecture for the Rime stack for Contiki. The Chameleon architecture separates the header processing from the Rime protocol logic. Instead of having each protocol create its own part of the packet header, protocols use packet attributes. Before sending a packet, a special Chameleon header processing module creates a packet header from the packet attributes. The same Chameleon module parses incoming packets and creates packet attributes from the header. The details are in our SenSys 2007 paper: Adam Dunkels, Fredrik Osterlind, Zhitao He. An Adaptive Communication Architecture for Wireless Sensor Networks. In Proceedings of the Fifth ACM Conference on Networked Embedded Sensor Systems (SenSys 2007), Sydney, Australia, November 2007. http://www.sics.se/~adam/dunkels07adaptive.pdf This is a rewrite of the code that was developed for the paper.
187 lines
6.2 KiB
C
187 lines
6.2 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: chameleon-raw.c,v 1.1 2008/02/25 02:14:34 adamdunkels Exp $
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*/
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/**
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* \file
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* A Chameleon module that produces non-optimized headers
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include <string.h>
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#include "net/rime/chameleon.h"
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#include "net/rime.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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struct raw_hdr {
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uint16_t channel;
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};
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/*---------------------------------------------------------------------------*/
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static struct channel *
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input(void)
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{
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const struct rimebuf_attrlist *a;
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int byteptr, bitptr, len;
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uint8_t *hdrptr;
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struct raw_hdr *hdr;
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struct channel *c;
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/* The packet has a header that tells us what channel the packet is
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for. */
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hdr = (struct raw_hdr *)rimebuf_dataptr();
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rimebuf_hdrreduce(sizeof(struct raw_hdr));
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c = channel_lookup(hdr->channel);
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if(c == NULL) {
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PRINTF("chameleon-raw: input: channel %d not found\n", hdr->channel);
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return NULL;
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}
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rimebuf_attr_clear();
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hdrptr = rimebuf_dataptr();
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rimebuf_hdrreduce(c->hdrsize);
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byteptr = bitptr = 0;
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for(a = c->attrlist; a->type != RIMEBUF_ATTR_NONE; ++a) {
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PRINTF("%d.%d: unpack_header type %s, len %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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rimebuf_attr_strings[a->type], a->len);
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len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);
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if(a->type == RIMEBUF_ADDR_SENDER ||
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a->type == RIMEBUF_ADDR_RECEIVER ||
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a->type == RIMEBUF_ADDR_ESENDER ||
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a->type == RIMEBUF_ADDR_ERECEIVER) {
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const rimeaddr_t addr;
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memcpy((uint8_t *)&addr, &hdrptr[byteptr], len / 8);
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PRINTF("%d.%d: unpack_header type %s, addr %d.%d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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rimebuf_attr_strings[a->type],
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addr.u8[0], addr.u8[1]);
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rimebuf_set_addr(a->type, &addr);
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} else {
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rimebuf_attr_t val = 0;
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memcpy((uint8_t *)&val, &hdrptr[byteptr], len / 8);
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rimebuf_set_attr(a->type, val);
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PRINTF("%d.%d: unpack_header type %s, val %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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rimebuf_attr_strings[a->type],
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val);
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}
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byteptr += len / 8;
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}
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return c;
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}
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/*---------------------------------------------------------------------------*/
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static int
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output(struct channel *c)
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{
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const struct rimebuf_attrlist *a;
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int byteptr, len;
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uint8_t *hdrptr;
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struct raw_hdr *hdr;
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/* Compute the total size of the final header by summing the size of
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all attributes that are used on this channel. */
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rimebuf_hdralloc(c->hdrsize);
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hdrptr = rimebuf_hdrptr();
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byteptr = 0;
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for(a = c->attrlist; a->type != RIMEBUF_ATTR_NONE; ++a) {
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PRINTF("%d.%d: pack_header type %s, len %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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rimebuf_attr_strings[a->type], a->len);
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len = (a->len & 0xf8) + ((a->len & 7) ? 8: 0);
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if(a->type == RIMEBUF_ADDR_SENDER ||
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a->type == RIMEBUF_ADDR_RECEIVER ||
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a->type == RIMEBUF_ADDR_ESENDER ||
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a->type == RIMEBUF_ADDR_ERECEIVER) {
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const rimeaddr_t *rimeaddr;
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/* memcpy(&hdrptr[byteptr], (uint8_t *)rimebuf_attr_aget(a->type), len / 8);*/
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rimeaddr = rimebuf_addr(a->type);
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hdrptr[byteptr] = rimeaddr->u8[0];
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hdrptr[byteptr + 1] = rimeaddr->u8[1];
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PRINTF("%d.%d: address %d.%d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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((uint8_t *)rimebuf_addr(a->type))[0],
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((uint8_t *)rimebuf_addr(a->type))[1]);
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} else {
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rimebuf_attr_t val;
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val = rimebuf_attr(a->type);
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hdrptr[byteptr] = rimebuf_attr(a->type);
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PRINTF("%d.%d: value %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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val);
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}
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byteptr += len / 8;
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}
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rimebuf_hdralloc(sizeof(struct raw_hdr));
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hdr = (struct raw_hdr *)rimebuf_hdrptr();
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hdr->channel = c->channelno;
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return 1; /* Send out packet */
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}
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/*---------------------------------------------------------------------------*/
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static int
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hdrsize(const struct rimebuf_attrlist *a)
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{
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int size, len;
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/* Compute the total size of the final header by summing the size of
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all attributes that are used on this channel. */
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size = 0;
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for(; a->type != RIMEBUF_ATTR_NONE; ++a) {
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/* PRINTF("chameleon header_size: header type %s (%d) len %d\n",
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rimebuf_attr_strings[a->type],
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a->type,
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a->len);*/
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len = a->len;
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if(len < 8) {
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len = 8;
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}
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size += len;
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}
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return size / 8;
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}
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/*---------------------------------------------------------------------------*/
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const struct chameleon_module chameleon_raw = { input, output, hdrsize, NULL };
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