text: /* packet-cfdp.c
   * Routines for CCSDS File Delivery Protocol (CFDP) dissection
   * Copyright 2013, Juan Antonio Montesinos juan.mondl@gmail.com
   *
   * Wireshark - Network traffic analyzer
   * By Gerald Combs <gerald@wireshark.org>
   * Copyright 1998 Gerald Combs
   *
   * SPDX-License-Identifier: GPL-2.0-or-later
   */
  
  #include "config.h"
  #include <epan/packet.h>
  #include <epan/expert.h>
  
  
  /* The CFDP standard can be found here:
   * http://public.ccsds.org/publications/archive/727x0b4.pdf
   *
   * The Store and Forward Overlay Operations are not included.
   */
  
  void proto_register_cfdp(void);
  void proto_reg_handoff_cfdp(void);
  
  /* Initialize the protocol and registered fields */
  static int proto_cfdp = -1;
  static int hf_cfdp_version = -1;
  static int hf_cfdp_pdu_type = -1;
  static int hf_cfdp_direction = -1;
  static int hf_cfdp_trans_mode = -1;
  static int hf_cfdp_crc_flag = -1;
  static int hf_cfdp_res1 = -1;
  static int hf_cfdp_data_length = -1;
  static int hf_cfdp_res2 = -1;
  static int hf_cfdp_entid_length = -1;
  static int hf_cfdp_res3 = -1;
  static int hf_cfdp_transeqnum_length = -1;
  static int hf_cfdp_srcid = -1;
  static int hf_cfdp_transeqnum = -1;
  static int hf_cfdp_dstid = -1;
  static int hf_cfdp_file_directive_type = -1;
  static int hf_cfdp_file_data_offset = -1;
  static int hf_cfdp_progress = -1;
  static int hf_cfdp_dir_code_ack = -1;
  static int hf_cfdp_dir_subtype_ack = -1;
  static int hf_cfdp_condition_code = -1;
  static int hf_cfdp_spare_one = -1;
  static int hf_cfdp_spare_one_2 = -1;
  static int hf_cfdp_spare_two = -1;
  static int hf_cfdp_spare_four = -1;
  static int hf_cfdp_spare_five = -1;
  static int hf_cfdp_spare_seven = -1;
  static int hf_cfdp_spare_seven_2 = -1;
  static int hf_cfdp_trans_stat_ack = -1;
  static int hf_cfdp_file_checksum = -1;
  static int hf_cfdp_file_size = -1;
  static int hf_cfdp_end_system_stat = -1;
  static int hf_cfdp_delivery_code = -1;
  static int hf_cfdp_file_stat = -1;
  static int hf_cfdp_segment_control = -1;
  static int hf_cfdp_src_file_name = -1;
  static int hf_cfdp_dst_file_name = -1;
  static int hf_cfdp_first_file_name = -1;
  static int hf_cfdp_second_file_name = -1;
  static int hf_cfdp_nak_st_scope = -1;
  static int hf_cfdp_nak_sp_scope = -1;
  static int hf_cfdp_crc = -1;
  static int hf_cfdp_action_code = -1;
  static int hf_cfdp_status_code_1 = -1;
  static int hf_cfdp_status_code_2 = -1;
  static int hf_cfdp_status_code_3 = -1;
  static int hf_cfdp_status_code_4 = -1;
  static int hf_cfdp_status_code_5 = -1;
  static int hf_cfdp_status_code_6 = -1;
  static int hf_cfdp_status_code_7 = -1;
  static int hf_cfdp_status_code_8 = -1;
  static int hf_cfdp_handler_code = -1;
  static int hf_cfdp_trans_mode_msg = -1;
  static int hf_cfdp_proxy_msg_type = -1;
  static int hf_cfdp_proxy_segment_control = -1;
  static int hf_cfdp_proxy_delivery_code = -1;
  static int hf_cfdp_response_req = -1;
  static int hf_cfdp_directory_name = -1;
  static int hf_cfdp_directory_file_name = -1;
  static int hf_cfdp_listing_resp_code = -1;
  static int hf_cfdp_report_file_name = -1;
  static int hf_cfdp_trans_stat = -1;
  static int hf_cfdp_trans_stat_2 = -1;
  static int hf_cfdp_rep_resp_code = -1;
  static int hf_cfdp_suspension_ind = -1;
  static int hf_cfdp_tlv_len = - 1;
  
  /* Generated from convert_proto_tree_add_text.pl */
  static int hf_cfdp_filestore_message = -1;
  static int hf_cfdp_entity = -1;
  static int hf_cfdp_message_to_user = -1;
  static int hf_cfdp_flow_label = -1;
  static int hf_cfdp_segment_requests = -1;
  static int hf_cfdp_user_data = -1;
  
  /* Initialize the subtree pointers */
  static gint ett_cfdp = -1;
  static gint ett_cfdp_header = -1;
  static gint ett_cfdp_file_directive_header = -1;
  static gint ett_cfdp_file_data_header = -1;
  static gint ett_cfdp_fault_location = -1;
  static gint ett_cfdp_crc = -1;
  static gint ett_cfdp_filestore_req = -1;
  static gint ett_cfdp_filestore_resp = -1;
  static gint ett_cfdp_msg_to_user = -1;
  static gint ett_cfdp_fault_hdl_overr = -1;
  static gint ett_cfdp_flow_label = -1;
  
  static expert_field ei_cfdp_bad_length = EI_INIT;
  
  
  static dissector_handle_t cfdp_handle;
  
  /* Some parameters */
  #define CFDP_HEADER_FIXED_FIELDS_LEN 4
  #define CFDP_APID 2045
  
  /* Bitmask for the first byte of the Header */
  #define HDR_VERSION_CFDP    0xe0
  #define HDR_TYPE_CFDP       0x10
  #define HDR_DIR             0x08
  #define HDR_TMODE           0x04
  #define HDR_CRCF            0x02
  #define HDR_RES1            0x01
  
  /* Bitmask for the second byte of the Header */
  #define HDR_RES2            0x80
  #define HDR_LEN_ENT_ID      0x70
  #define HDR_RES3            0x08
  #define HDR_LEN_TSEQ_NUM    0x07
  
  /* File Directive Codes */
  #define EOF_PDU          4
  #define FINISHED_PDU     5
  #define ACK_PDU          6
  #define METADATA_PDU     7
  #define NAK_PDU          8
  #define PROMPT_PDU       9
  #define KEEP_ALIVE_PDU  12
  
  /* TLV Types */
  #define FILESTORE_REQ    0
  #define FILESTORE_RESP   1
  #define MSG_TO_USER      2
  #define FAULT_HDL_OVERR  4
  #define FLOW_LABEL       5
  #define FAULT_LOCATION   6
  
  /* ID for reserved CFDP Messages  */
  #define CFDP_MSG_TO_USER 0x63666470
  
  /* Proxy Operations Message Types */
  #define PROXY_PUT_REQ           0x00
  #define PROXY_MSG_TO_USER       0x01
  #define PROXY_FILESTORE_REQ     0x02
  #define PROXY_FAULT_HDL_OVERR   0x03
  #define PROXY_TRANS_MODE        0x04
  #define PROXY_FLOW_LABEL        0x05
  #define PROXY_SEGMENT_CONTROL   0x06
  #define PROXY_PUT_RESP          0x07
  #define PROXY_FILESTORE_RESP    0x08
  #define PROXY_PUT_CANCEL        0x09
  #define ORIG_TRANS_ID           0x0A
  #define DIRECTORY_LIST_REQ      0x10
  #define DIRECTORY_LIST_RESP     0x11
  #define REMOTE_STAT_REP_REQ     0x20
  #define REMOTE_STAT_REP_RESP    0x21
  #define REMOTE_SUSPEND_REQ      0x30
  #define REMOTE_SUSPEND_RESP     0x31
  #define REMOTE_RESUME_REQ       0x38
  #define REMOTE_RESUME_RESP      0x39
  
  /* PDU Type */
  static const value_string cfdp_pdu_type[] = {
      { 0, "File Directive" },
      { 1, "File Data" },
      { 0, NULL }
  };
  
  /* PDU Direction */
  static const value_string cfdp_direction[] = {
      { 0, "Toward file receiver" },
      { 1, "Toward file sender" },
      { 0, NULL }
  };
  
  /* Transmission mode */
  static const value_string cfdp_trans_mode[] = {
      { 0, "Acknowledged" },
      { 1, "Unacknowledged" },
      { 0, NULL }
  };
  
  /* CRC */
  static const value_string cfdp_crc_flag[] = {
      { 0, "CRC not present" },
      { 1, "CRC present" },
      { 0, NULL }
  };
  
  /* File Directive PDU Type */
  static const value_string cfdp_file_directive_type[] = {
      {  4, "EOF PDU"},
      {  5, "Finished PDU"},
      {  6, "ACK PDU"},
      {  7, "Metadata PDU"},
      {  8, "NACK PDU"},
      {  9, "Prompt PDU"},
      { 12, "Keep Alive PDU"},
      {  0, NULL}
  };
  
  /* Condition codes */
  static const value_string cfdp_condition_codes[] = {
      {  0, "No error"},
      {  1, "Positive ACK limit reached"},
      {  2, "Keep alive limit reached"},
      {  3, "Invalid transmission mode"},
      {  4, "Filestore rejection"},
      {  5, "File checksum failure"},
      {  6, "File size error"},
      {  7, "NAK limit reached"},
      {  8, "Inactivity detected"},
      {  9, "Check limit reached"},
      { 14, "Suspend.request received"},
      { 15, "Cancel.request received"},
      {  0, NULL }
  };
  
  /* Transaction status */
  static const value_string cfdp_trans_stat_ack[] = {
      { 0, "Undefined" },
      { 1, "Active" },
      { 2, "Terminated" },
      { 3, "Unrecognized" },
      { 0, NULL }
  };
  
  /* End system status */
  static const value_string cfdp_end_system_stat[] = {
      { 0, "Generated by Waypoint" },
      { 1, "Generated by End System" },
      { 0, NULL }
  };
  
  /* Delivery code */
  static const value_string cfdp_delivery_code[] = {
      { 0, "Data Complete" },
      { 1, "Data incomplete" },
      { 0, NULL }
  };
  
  /* Filestore operations action code */
  static const value_string cfdp_action_code[] = {
      { 0, "Create File" },
      { 1, "Delete File" },
      { 2, "Rename File" },
      { 3, "Append File" },
      { 4, "Replace File" },
      { 5, "Create Directory" },
      { 6, "Remove Directory" },
      { 7, "Deny File (delete if present)" },
      { 8, "Deny Directory (remove if present)" },
      { 0, NULL }
  };
  
  /* Filestore operations status codes */
  static const value_string cfdp_status_code_1[] = {
      { 0, "Successful" },
      { 1, "Create not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_2[] = {
      { 0, "Successful" },
      { 1, "File does not exist" },
      { 2, "Delete not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_3[] = {
      { 0, "Successful" },
      { 1, "Old File Name does not exist" },
      { 2, "New File Name already exists" },
      { 3, "Rename not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_4[] = {
      { 0, "Successful" },
      { 1, "File Name 1 does not exist" },
      { 2, "File Name 2 does not exist" },
      { 3, "Append not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_5[] = {
      { 0, "Successful" },
      { 1, "File Name 1 does not exist" },
      { 2, "File Name 2 does not exist" },
      { 3, "Replace not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_6[] = {
      { 0, "Successful" },
      { 1, "Directory cannot be created" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_7[] = {
      { 0, "Successful" },
      { 1, "Directory does not exist" },
      { 2, "Delete not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  static const value_string cfdp_status_code_8[] = {
      { 0, "Successful" },
      { 1, "Delete not allowed" },
      { 8, "Not performed" },
      { 0, NULL }
  };
  
  /* Finished PDU File Status */
  static const value_string cfdp_file_stat[] = {
      { 0, "Delivery file discarded deliberately" },
      { 1, "Delivery file discarded due to filestore rejection" },
      { 2, "Delivery file retained in filestore successfully" },
      { 3, "Delivery file status unreported" },
      { 0, NULL }
  };
  
  /* Segmentation control */
  static const value_string cfdp_segment_control[] = {
      { 0, "Record boundaries respected" },
      { 1, "Record boundaries not respected" },
      { 0, NULL }
  };
  
  /* Fault handler override Handler code*/
  static const value_string cfdp_handler_codes[] = {
      { 1, "issue Notice of Cancellation" },
      { 2, "issue Notice of Suspension" },
      { 3, "Ignore error" },
      { 4, "Abandon transaction" },
      { 0, NULL }
  };
  
  /* Type of Proxy message */
  static const value_string cfdp_proxy_msg_type[] = {
      { 0x00, "Proxy Put Request"},
      { 0x01, "Proxy Message To User"},
      { 0x02, "Proxy Filestore Request"},
      { 0x03, "Proxy Fault Handler Override"},
      { 0x04, "Proxy Transmission Mode"},
      { 0x05, "Proxy Flow Label"},
      { 0x06, "Proxy Segmentation Control"},
      { 0x07, "Proxy Put Response"},
      { 0x08, "Proxy Filestore Response"},
      { 0x09, "Proxy Put Cancel"},
      { 0x0A, "Originating Transaction ID"},
      { 0x10, "Directory Listing Request"},
      { 0x11, "Directory Listing Response"},
      { 0x20, "Remote Status Report Request"},
      { 0x21, "Remote Status Report Response"},
      { 0x30, "Remote Suspend Request"},
      { 0x31, "Remote Suspend Response"},
      { 0x38, "Remote Resume Request"},
      { 0x39, "Remote Resume Response"},
      { 0, NULL }
  };
  static value_string_ext cfdp_proxy_msg_type_ext = VALUE_STRING_EXT_INIT(cfdp_proxy_msg_type);
  
  /* Prompt PDU Response required */
  static const value_string cfdp_response_req[] = {
      { 0, "NAK" },
      { 1, "Keep Alive" },
      { 0, NULL }
  };
  
  /* Listing response code */
  static const value_string cfdp_listing_resp_code[] = {
      { 0, "Successful" },
      { 1, "Unsuccessful" },
      { 0, NULL }
  };
  
  /* Report response code */
  static const value_string cfdp_rep_resp_code[] = {
      { 0, "Unsuccessful" },
      { 1, "Successful" },
      { 0, NULL }
  };
  
  /* Suspension indication */
  static const value_string cfdp_suspension_ind[] = {
      { 0, "Not Suspended" },
      { 1, "Suspended" },
      { 0, NULL }
  };
  
  /* File Directive codes */
  static const value_string cfdp_directive_codes[] = {
      { 0x04, "EOF" },
      { 0x05, "Finished" },
      { 0x06, "ACK" },
      { 0x07, "Metadata" },
      { 0x08, "NAK" },
      { 0x09, "Prompt" },
      { 0x0C, "Keep Alive" },
      { 0, NULL }
  };
  
  /* Dissect the Source Entity ID field */
  static void
  dissect_cfdp_src_entity_id(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 offset, guint8 len_ent_id)
  {
      if(len_ent_id > 0 && len_ent_id <= 8){
          proto_tree_add_item(tree, hf_cfdp_srcid, tvb, offset, len_ent_id, ENC_BIG_ENDIAN);
      }
      else{
          proto_tree_add_expert_format(tree, pinfo, &ei_cfdp_bad_length, tvb, offset, 0, "Wrong length for the entity ID");
      }
  }
  
  /* Dissect the Destination Entity ID field */
  static void
  dissect_cfdp_dst_entity_id(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 offset, guint8 len_ent_id)
  {
      if(len_ent_id > 0 && len_ent_id <= 8){
          proto_tree_add_item(tree, hf_cfdp_dstid, tvb, offset, len_ent_id, ENC_BIG_ENDIAN);
      }
      else{
          proto_tree_add_expert_format(tree, pinfo, &ei_cfdp_bad_length, tvb, offset, 0, "Wrong length for the entity ID");
      }
  }
  
  /* Dissect the Transaction Sequence Number field */
  static void
  dissect_cfdp_tseq_num(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 offset, guint8 len_tseq_num)
  {
      if(len_tseq_num > 0 && len_tseq_num <= 8){
          proto_tree_add_item(tree, hf_cfdp_transeqnum, tvb, offset, len_tseq_num, ENC_BIG_ENDIAN);
      }
      else{
          proto_tree_add_expert_format(tree, pinfo, &ei_cfdp_bad_length, tvb, offset, 0, "Wrong length for transaction sequence number");
      }
  }
  
  /* Dissect the Filestore Request TLV */
  static guint32 dissect_cfdp_filestore_req_tlv(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset){
  
      guint8 tlv_len;
  
      guint32 offset = ext_offset;
  
      /* Get field length */
      tlv_len = tvb_get_guint8(tvb, offset);
      offset += 1;
      if(tlv_len > 0){
          proto_tree  *cfdp_filestore_req_tree;
          guint8 aux_byte;
  
          /* Create a TLV subtree */
          cfdp_filestore_req_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
              ett_cfdp_filestore_req, NULL, "Filestore Request TLV");
  
          proto_tree_add_uint(cfdp_filestore_req_tree, hf_cfdp_tlv_len, tvb, offset-1, 1, tlv_len);
  
          aux_byte = tvb_get_guint8(tvb, offset);
          proto_tree_add_uint(cfdp_filestore_req_tree, hf_cfdp_action_code, tvb, offset, 1, aux_byte);
          proto_tree_add_uint(cfdp_filestore_req_tree, hf_cfdp_spare_four, tvb, offset, 1, aux_byte);
          offset += 1;
  
          aux_byte = tvb_get_guint8(tvb, offset);
          offset += 1;
          proto_tree_add_item(cfdp_filestore_req_tree, hf_cfdp_first_file_name, tvb, offset, aux_byte, ENC_ASCII|ENC_NA);
          offset += aux_byte;
  
          aux_byte = tvb_get_guint8(tvb, offset);
          offset += 1;
          if(aux_byte > 0){
              proto_tree_add_item(cfdp_filestore_req_tree, hf_cfdp_second_file_name, tvb, offset, aux_byte, ENC_ASCII|ENC_NA);
              offset += aux_byte;
          }
      }
  
      return offset;
  }
  
  /* Dissect the Filestore Response TLV */
  static guint32 dissect_cfdp_filestore_resp_tlv(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset){
  
      guint8 tlv_len;
  
      guint32 offset = ext_offset;
  
      /* Get field length */
      tlv_len = tvb_get_guint8(tvb, offset);
      offset += 1;
      if(tlv_len > 0){
          proto_tree  *cfdp_filestore_resp_tree;
          guint8 aux_byte;
  
          /* Create a subtree */
          cfdp_filestore_resp_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
                          ett_cfdp_filestore_resp, NULL, "Filestore Response TLV");
  
          proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_tlv_len, tvb, offset-1, 1, tlv_len);
  
          aux_byte = tvb_get_guint8(tvb, offset);
          proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_action_code, tvb, offset, 1, aux_byte);
          switch((aux_byte & 0xF0) >> 4){
              case 0:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_1, tvb, offset, 1, aux_byte);
                  break;
              case 1:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_2, tvb, offset, 1, aux_byte);
                  break;
              case 2:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_3, tvb, offset, 1, aux_byte);
                  break;
              case 3:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_4, tvb, offset, 1, aux_byte);
                  break;
              case 4:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_5, tvb, offset, 1, aux_byte);
                  break;
              case 5:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_6, tvb, offset, 1, aux_byte);
                  break;
              case 6:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_7, tvb, offset, 1, aux_byte);
                  break;
              case 7: case 8:
                  proto_tree_add_uint(cfdp_filestore_resp_tree, hf_cfdp_status_code_8, tvb, offset, 1, aux_byte);
                  break;
  
              default:
                  break;
          }
          offset += 1;
  
          aux_byte = tvb_get_guint8(tvb, offset);
          offset += 1;
          proto_tree_add_item(cfdp_filestore_resp_tree, hf_cfdp_first_file_name, tvb, offset, aux_byte, ENC_ASCII|ENC_NA);
          offset += aux_byte;
  
          aux_byte = tvb_get_guint8(tvb, offset);
          offset += 1;
          if(aux_byte > 0){
              proto_tree_add_item(cfdp_filestore_resp_tree, hf_cfdp_second_file_name, tvb, offset, aux_byte, ENC_ASCII|ENC_NA);
              offset += aux_byte;
          }
          /* Filestore Message */
          aux_byte = tvb_get_guint8(tvb, offset);
          offset += 1;
          if(aux_byte > 0){
              proto_tree_add_item(cfdp_filestore_resp_tree, hf_cfdp_filestore_message, tvb, offset, tlv_len, ENC_NA);
              offset += aux_byte;
          }
      }
  
      return offset;
  }
  
  /* Dissect the Fault Location TLV */
  static guint32 dissect_cfdp_fault_location_tlv(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset){
  
      guint8 tlv_len;
  
      guint32 offset = ext_offset;
  
      /* Get field length */
      tlv_len = tvb_get_guint8(tvb, offset);
      offset += 1;
      if(tlv_len > 0){
          proto_tree  *cfdp_fault_location_tree;
  
          /* Create a subtree */
          cfdp_fault_location_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
                                          ett_cfdp_fault_location, NULL, "Fault location TLV");
  
          proto_tree_add_uint(cfdp_fault_location_tree, hf_cfdp_tlv_len, tvb, offset-1, 1, tlv_len);
  
          proto_tree_add_item(cfdp_fault_location_tree, hf_cfdp_entity, tvb, offset, tlv_len, ENC_NA);
          offset += tlv_len;
      }
  
      return offset;
  }
  
  /* Dissect the Message to User TLV */
  static guint32 dissect_cfdp_msg_to_user_tlv(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 ext_offset){
  
      guint8 aux_byte, tlv_type, tlv_len;
      proto_tree  *cfdp_msg_to_user_tree;
  
      guint32 offset = ext_offset;
      guint32 msg_to_user_id;
      int len_ent_id;
      int len_tseq_num;
  
      /* Get tlv len */
      tlv_len = tvb_get_guint8(tvb, offset);
      offset += 1;
  
      /* Create a subtree */
      cfdp_msg_to_user_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
                                      ett_cfdp_filestore_resp, NULL, "Message To User TLV");
  
      proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_tlv_len, tvb, offset-1, 1, tlv_len);
  
      msg_to_user_id = tvb_get_ntohl(tvb, offset);
      /* Proxy operations */
      if(msg_to_user_id == CFDP_MSG_TO_USER){
          offset += 4;
          tlv_type =  tvb_get_guint8(tvb, offset);
          proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_proxy_msg_type, tvb, offset, 1, tlv_type);
          offset += 1;
          switch(tlv_type){
  
              case PROXY_PUT_REQ:
                  tlv_len = tvb_get_guint8(tvb, offset);
                  offset += 1;
                  dissect_cfdp_dst_entity_id(tvb, pinfo, cfdp_msg_to_user_tree, offset, tlv_len);
                  offset += tlv_len;
  
                  tlv_len = tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_src_file_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
  
                  tlv_len = tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_dst_file_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
  
                  break;
  
              case PROXY_MSG_TO_USER:
                  tlv_len = tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_message_to_user, tvb, offset, tlv_len, ENC_NA);
                  break;
  
              case PROXY_FILESTORE_REQ:
                  offset = dissect_cfdp_filestore_req_tlv(tvb, cfdp_msg_to_user_tree, offset);
                  break;
  
              case PROXY_FAULT_HDL_OVERR:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_condition_code, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_handler_code, tvb, offset, 1, aux_byte);
                  offset += 1;
                  break;
  
              case PROXY_TRANS_MODE:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_seven_2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_trans_mode_msg, tvb, offset, 1, aux_byte);
                  offset += 1;
                  break;
  
              case PROXY_FLOW_LABEL:
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_flow_label, tvb, offset, tlv_len, ENC_NA);
                  break;
  
              case PROXY_SEGMENT_CONTROL:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_seven_2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_proxy_segment_control, tvb, offset, 1, aux_byte);
                  offset += 1;
                  break;
  
              case PROXY_PUT_RESP:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_condition_code, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_condition_code, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_proxy_delivery_code, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_file_stat, tvb, offset, 1, aux_byte);
                  offset += 1;
                  break;
  
              case PROXY_FILESTORE_RESP:
                  offset = dissect_cfdp_filestore_req_tlv(tvb, cfdp_msg_to_user_tree, offset);
                  break;
  
              case PROXY_PUT_CANCEL:
                  break;
  
              case ORIG_TRANS_ID:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_res2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_entid_length, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_res3, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_transeqnum_length, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  len_ent_id = ((aux_byte & HDR_LEN_ENT_ID) >> 4) + 1;
                  dissect_cfdp_src_entity_id(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_ent_id);
                  offset += len_ent_id;
  
                  len_tseq_num = (aux_byte & HDR_LEN_TSEQ_NUM) +1;
                  dissect_cfdp_tseq_num(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_tseq_num);
                  offset += len_tseq_num;
  
                  break;
  
              case DIRECTORY_LIST_REQ:
                  /* Directory Name */
                  tlv_len =  tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_directory_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
                  /* Directory File Name */
                  tlv_len =  tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_directory_file_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
                  break;
  
              case DIRECTORY_LIST_RESP:
                  /* Listing Response Code */
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_listing_resp_code, tvb, offset, 1, aux_byte);
                  offset += 1;
                  /* Directory Name */
                  tlv_len =  tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_directory_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
                  /* Directory File Name */
                  tlv_len =  tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_directory_file_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
                  break;
  
              case REMOTE_STAT_REP_REQ:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_res2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_entid_length, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_res3, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_transeqnum_length, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  len_ent_id = ((aux_byte & HDR_LEN_ENT_ID) >> 4) + 1;
                  dissect_cfdp_src_entity_id(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_ent_id);
                  offset += len_ent_id;
  
                  len_tseq_num = (aux_byte & HDR_LEN_TSEQ_NUM) +1;
                  dissect_cfdp_tseq_num(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_tseq_num);
                  offset += len_tseq_num;
  
                  /* Report File Name */
                  tlv_len =  tvb_get_guint8(tvb, offset);
                  offset += 1;
                  proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_report_file_name, tvb, offset, tlv_len, ENC_ASCII|ENC_NA);
                  offset += tlv_len;
                  break;
  
              case REMOTE_STAT_REP_RESP:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_trans_stat, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_five, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_rep_resp_code, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one_2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_entid_length, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_transeqnum_length, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  len_ent_id = ((aux_byte & HDR_LEN_ENT_ID) >> 4) + 1;
                  dissect_cfdp_src_entity_id(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_ent_id);
                  offset += len_ent_id;
  
                  len_tseq_num = (aux_byte & HDR_LEN_TSEQ_NUM) +1;
                  dissect_cfdp_tseq_num(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_tseq_num);
                  offset += len_tseq_num;
                  break;
  
              case REMOTE_SUSPEND_REQ:
              case REMOTE_RESUME_REQ:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one_2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_entid_length, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_transeqnum_length, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  len_ent_id = ((aux_byte & HDR_LEN_ENT_ID) >> 4) + 1;
                  dissect_cfdp_src_entity_id(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_ent_id);
                  offset += len_ent_id;
  
                  len_tseq_num = (aux_byte & HDR_LEN_TSEQ_NUM) +1;
                  dissect_cfdp_tseq_num(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_tseq_num);
                  offset += len_tseq_num;
                  break;
  
              case REMOTE_SUSPEND_RESP:
              case REMOTE_RESUME_RESP:
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_suspension_ind, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_trans_stat_2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_five, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  aux_byte = tvb_get_guint8(tvb, offset);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one_2, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_entid_length, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_spare_one, tvb, offset, 1, aux_byte);
                  proto_tree_add_uint(cfdp_msg_to_user_tree, hf_cfdp_transeqnum_length, tvb, offset, 1, aux_byte);
                  offset += 1;
  
                  len_ent_id = ((aux_byte & HDR_LEN_ENT_ID) >> 4) + 1;
                  dissect_cfdp_src_entity_id(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_ent_id);
                  offset += len_ent_id;
  
                  len_tseq_num = (aux_byte & HDR_LEN_TSEQ_NUM) +1;
                  dissect_cfdp_tseq_num(tvb, pinfo, cfdp_msg_to_user_tree, offset, len_tseq_num);
                  offset += len_tseq_num;
                  break;
  
              default:
                  break;
          }
      }else{
          proto_tree_add_item(cfdp_msg_to_user_tree, hf_cfdp_message_to_user, tvb, offset, tlv_len, ENC_NA);
          offset += tlv_len;
      }
  
      return offset;
  }
  
  /* Dissect the Fault Handler Override TLV */
  static guint32 dissect_cfdp_fault_handler_overr_tlv(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset){
  
      guint8 aux_byte, tlv_len;
      proto_tree  *cfdp_fault_hdl_overr_tree;
  
      guint32 offset = ext_offset;
  
      /* Get tlv len */
      tlv_len = tvb_get_guint8(tvb, offset);
      offset += 1;
  
      /* Create a subtree */
      cfdp_fault_hdl_overr_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
                          ett_cfdp_fault_hdl_overr, NULL, "Fault Handler Override TLV");
  
      proto_tree_add_uint(cfdp_fault_hdl_overr_tree, hf_cfdp_tlv_len, tvb, offset-1, 1, tlv_len);
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(cfdp_fault_hdl_overr_tree, hf_cfdp_condition_code, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(cfdp_fault_hdl_overr_tree, hf_cfdp_handler_code, tvb, offset, 1, aux_byte);
      offset += 1;
  
      return offset;
  }
  
  /* Dissect the Flow Label TLV */
  static guint32 dissect_cfdp_flow_label_tlv(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset){
  
      guint8 tlv_len;
      proto_tree  *cfdp_flow_label_tree;
  
      guint32 offset = ext_offset;
  
      /* Get tlv len */
      tlv_len = tvb_get_guint8(tvb, offset);
      offset += 1;
  
      /* Create a subtree */
      cfdp_flow_label_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
                                          ett_cfdp_flow_label, NULL, "Flow Label TLV");
  
      /* It is undefined, so no specific encoding */
      proto_tree_add_item(cfdp_flow_label_tree, hf_cfdp_flow_label, tvb, offset, tlv_len, ENC_NA);
  
      return offset;
  }
  
  /* Dissect the End of File PDU */
  static guint32 dissect_cfdp_eof_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 ext_offset, guint ext_packet_len){
  
      guint8 aux_byte, tlv_type, tlv_len;
      proto_tree  *cfdp_fault_location_tree;
  
      guint32 offset = ext_offset;
      guint   cfdp_packet_data_length = ext_packet_len;
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(tree, hf_cfdp_condition_code, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_spare_four, tvb, offset, 1, aux_byte);
      offset += 1;
  
      col_add_fstr(pinfo->cinfo, COL_INFO, "EOF (%s)",  val_to_str_const((aux_byte & 0xF0) >> 4, cfdp_condition_codes, "Reserved Code"));
  
      proto_tree_add_checksum(tree, tvb, offset, hf_cfdp_file_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
      offset += 4;
  
      proto_tree_add_item(tree, hf_cfdp_file_size, tvb, offset, 4, ENC_BIG_ENDIAN);
      offset += 4;
  
      if(offset < cfdp_packet_data_length){
          tlv_type = tvb_get_guint8(tvb, offset);
          offset += 1;
          if(tlv_type == FAULT_LOCATION){
              tlv_len = tvb_get_guint8(tvb, offset);
              offset += 1;
              cfdp_fault_location_tree = proto_tree_add_subtree(tree, tvb, offset-2, tlv_len+2,
                          ett_cfdp_fault_location, NULL, "Fault location TLV");
  
              proto_tree_add_item(cfdp_fault_location_tree, hf_cfdp_entity, tvb, offset, tlv_len, ENC_NA);
              offset += tlv_len;
          }
      }
  
      return offset;
  }
  
  /* Dissect the Finished PDU */
  static guint32 dissect_cfdp_finished_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 ext_offset, guint ext_packet_len){
  
      guint32 offset = ext_offset;
      guint8  aux_byte, tlv_type;
  
  
      guint cfdp_packet_data_length = ext_packet_len;
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(tree, hf_cfdp_condition_code,  tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_end_system_stat, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_delivery_code,   tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_file_stat,       tvb, offset, 1, aux_byte);
      offset += 1;
  
      col_add_fstr(pinfo->cinfo, COL_INFO, "Finished PDU (%s)",  val_to_str_const((aux_byte & 0xF0) >> 4, cfdp_condition_codes, "Reserved Code"));
  
      /* Add TLV fields */
      while(offset < cfdp_packet_data_length){
          tlv_type = tvb_get_guint8(tvb, offset);
          offset += 1;
          switch(tlv_type){
              case FILESTORE_RESP:
                  offset = dissect_cfdp_filestore_resp_tlv(tvb, tree, offset);
                  break;
  
              case FAULT_LOCATION:
                  offset = dissect_cfdp_fault_location_tlv(tvb, tree, offset);
                  break;
  
              default:
                  break;
          }
      }
  
      return offset;
  }
  
  /* Dissect the ACK PDU */
  static guint32 dissect_cfdp_ack_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 ext_offset){
  
      guint8 aux_byte;
      guint32 offset = ext_offset;
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(tree, hf_cfdp_dir_code_ack, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_dir_subtype_ack, tvb, offset, 1, aux_byte);
      offset += 1;
  
      col_add_fstr(pinfo->cinfo, COL_INFO, "ACK PDU (%s)",  val_to_str_const((aux_byte & 0xF0) >> 4, cfdp_directive_codes, "Unknown PDU"));
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(tree, hf_cfdp_condition_code, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_spare_two, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_trans_stat_ack, tvb, offset, 1, aux_byte);
      offset += 1;
  
      return offset;
  }
  
  /* Dissect the Metadata PDU */
  static guint32 dissect_cfdp_metadata_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 ext_offset, guint ext_packet_len){
  
      guint8 aux_byte, tlv_type;
      guint  cfdp_packet_data_length = ext_packet_len;
  
      guint32 offset = ext_offset;
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(tree, hf_cfdp_segment_control, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_spare_seven, tvb, offset, 1, aux_byte);
      offset += 1;
      proto_tree_add_item(tree, hf_cfdp_file_size, tvb, offset, 4, ENC_BIG_ENDIAN);
      offset += 4;
      aux_byte = tvb_get_guint8(tvb, offset);
      if(aux_byte >0){
          proto_tree_add_item(tree, hf_cfdp_src_file_name, tvb, offset+1, aux_byte, ENC_ASCII|ENC_NA);
          offset += aux_byte+1;
          aux_byte = tvb_get_guint8(tvb, offset);
          proto_tree_add_item(tree, hf_cfdp_dst_file_name, tvb, offset+1, aux_byte, ENC_ASCII|ENC_NA);
          offset += aux_byte+1;
      }
      /* Add TLV fields */
      while(offset < cfdp_packet_data_length){
          tlv_type = tvb_get_guint8(tvb, offset);
          offset += 1;
          switch(tlv_type){
              case FILESTORE_REQ:
                  offset = dissect_cfdp_filestore_req_tlv(tvb, tree, offset);
                  break;
  
              case MSG_TO_USER:
                  offset = dissect_cfdp_msg_to_user_tlv(tvb, pinfo, tree, offset);
                  break;
  
              case FAULT_HDL_OVERR:
                  offset = dissect_cfdp_fault_handler_overr_tlv(tvb, tree, offset);
                  break;
  
              case FLOW_LABEL:
                  offset = dissect_cfdp_flow_label_tlv(tvb, tree, offset);
                  break;
  
              default:
                  break;
          }
      }
  
      return offset;
  }
  
  /* Dissect the NAK PDU */
  static guint32 dissect_cfdp_nak_pdu(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset, guint ext_packet_len){
  
      guint32 offset = ext_offset;
      guint cfdp_packet_data_length = ext_packet_len;
  
      proto_tree_add_item(tree, hf_cfdp_nak_st_scope, tvb, offset, 4, ENC_BIG_ENDIAN);
      offset += 4;
      proto_tree_add_item(tree, hf_cfdp_nak_sp_scope, tvb, offset, 4, ENC_BIG_ENDIAN);
      offset += 4;
      proto_tree_add_item(tree, hf_cfdp_segment_requests, tvb, offset, cfdp_packet_data_length-9, ENC_NA);
      offset += cfdp_packet_data_length-9;
  
      return offset;
  }
  
  /* Dissect the Prompt PDU */
  static guint32 dissect_cfdp_prompt_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 ext_offset){
  
      guint8 aux_byte;
      guint32 offset = ext_offset;
  
      aux_byte = tvb_get_guint8(tvb, offset);
      proto_tree_add_uint(tree, hf_cfdp_response_req, tvb, offset, 1, aux_byte);
      proto_tree_add_uint(tree, hf_cfdp_spare_seven, tvb, offset, 1, aux_byte);
      offset += 1;
  
      col_add_fstr(pinfo->cinfo, COL_INFO, "Prompt PDU (%s)",  val_to_str_const((aux_byte & 0x80) >> 7, cfdp_response_req, "Unknown"));
  
      return offset;
  }
  
  /* Dissect the Keep Alive PDU */
  static guint32 dissect_cfdp_keep_alive_pdu(tvbuff_t *tvb, proto_tree *tree, guint32 ext_offset){
  
      guint32 offset = ext_offset;
  
      proto_tree_add_item(tree, hf_cfdp_progress, tvb, offset, 4, ENC_BIG_ENDIAN);
      offset += 4;
  
      return offset;
  }
  
  /* Code to actually dissect the packets */
  static int
  dissect_cfdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  {
      int          offset          = 0;
      proto_item  *cfdp_packet;
      proto_item  *cfdp_tree;
      proto_item  *cfdp_header;
      proto_tree  *cfdp_header_tree;
      gint cfdp_packet_length;
      gint cfdp_packet_reported_length;
      gint cfdp_packet_header_length;
      gint cfdp_packet_data_length;
      gint length;
      guint8 first_byte;
      guint8 second_byte;
      gint len_ent_id;
      gint len_tseq_num;
  
      col_set_str(pinfo->cinfo, COL_PROTOCOL, "CFDP");
      col_clear(pinfo->cinfo, COL_INFO);
  
      cfdp_packet_reported_length = tvb_reported_length_remaining(tvb, 0);
      cfdp_packet_header_length = (tvb_get_guint8(tvb, 3) & HDR_LEN_TSEQ_NUM) + 1 + 2*(((tvb_get_guint8(tvb, 3) & HDR_LEN_ENT_ID) >>4) +1) + CFDP_HEADER_FIXED_FIELDS_LEN;
      cfdp_packet_length = tvb_get_ntohs(tvb, 1) + cfdp_packet_header_length;
  
  
  
      /* Min length is size of header plus 2 octets, whereas max length is reported length.
       * If the length field in the CFDP header is outside of these bounds,
       * use the value it violates.  Otherwise, use the length field value.
       */
      if(cfdp_packet_length > cfdp_packet_reported_length)
          length = cfdp_packet_reported_length;
      else if(cfdp_packet_length < cfdp_packet_header_length + 2)
          length = cfdp_packet_header_length + 2;
      else
          length = cfdp_packet_length;
  
      /* Build the cfdp tree */
      cfdp_packet = proto_tree_add_item(tree, proto_cfdp, tvb, 0, length, ENC_NA);
      cfdp_tree   = proto_item_add_subtree(cfdp_packet, ett_cfdp);
  
      cfdp_header_tree = proto_tree_add_subtree(cfdp_tree, tvb, offset, cfdp_packet_header_length,
                                                                  ett_cfdp_header, &cfdp_header, "CFDP Header");
  
      first_byte = tvb_get_guint8(tvb, offset);
  
      /* CRC code is not included in the packet data length */
      cfdp_packet_data_length = tvb_get_ntohs(tvb, 1)-2*((first_byte & HDR_CRCF) >>1);
  
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_version,    tvb, offset, 1, first_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_pdu_type,   tvb, offset, 1, first_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_direction,  tvb, offset, 1, first_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_trans_mode, tvb, offset, 1, first_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_crc_flag,   tvb, offset, 1, first_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_res1,       tvb, offset, 1, first_byte);
      offset += 1;
  
      proto_tree_add_item(cfdp_header_tree, hf_cfdp_data_length, tvb, offset, 2, ENC_BIG_ENDIAN);
      offset += 2;
  
      second_byte = tvb_get_guint8(tvb, offset);
  
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_res2, tvb, offset, 1, second_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_entid_length, tvb, offset, 1, second_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_res3, tvb, offset, 1, second_byte);
      proto_tree_add_uint(cfdp_header_tree, hf_cfdp_transeqnum_length, tvb, offset, 1, second_byte);
      offset += 1;
  
      len_ent_id = ((second_byte & HDR_LEN_ENT_ID) >> 4) + 1;
      dissect_cfdp_src_entity_id(tvb, pinfo, cfdp_header_tree, offset, len_ent_id);
      offset += len_ent_id;
  
      len_tseq_num = (second_byte & HDR_LEN_TSEQ_NUM) +1;
      dissect_cfdp_tseq_num(tvb, pinfo, cfdp_header_tree, offset, len_tseq_num);
      offset += len_tseq_num;
  
      dissect_cfdp_dst_entity_id(tvb, pinfo, cfdp_header_tree, offset, len_ent_id);
      offset += len_ent_id;
  
      proto_item_set_end(cfdp_header, tvb, offset);
  
      /* Build the File Directive or the File Data tree */
      if(!(first_byte & HDR_TYPE_CFDP))
      {
          proto_item *cfdp_file_directive_header;
          proto_tree *cfdp_file_directive_header_tree;
          guint8      directive_code;
  
          cfdp_file_directive_header_tree = proto_tree_add_subtree(cfdp_tree, tvb, offset, cfdp_packet_data_length,
                                                          ett_cfdp_file_directive_header, &cfdp_file_directive_header, "CFDP File Directive");
  
          directive_code = tvb_get_guint8(tvb, offset);
          proto_tree_add_uint(cfdp_file_directive_header_tree, hf_cfdp_file_directive_type, tvb, offset, 1, directive_code);
          offset += 1;
  
          col_add_fstr(pinfo->cinfo, COL_INFO, "%s PDU",  val_to_str(directive_code, cfdp_directive_codes, "Reserved (%d)"));
  
          switch(directive_code)
          {
              case EOF_PDU:
                  offset = dissect_cfdp_eof_pdu(tvb, pinfo, cfdp_file_directive_header_tree, offset, cfdp_packet_data_length);
                  break;
  
              case FINISHED_PDU:
                  offset = dissect_cfdp_finished_pdu(tvb, pinfo, cfdp_file_directive_header_tree, offset, cfdp_packet_data_length);
                  break;
  
              case ACK_PDU:
                  offset = dissect_cfdp_ack_pdu(tvb, pinfo, cfdp_file_directive_header_tree, offset);
                  break;
  
              case METADATA_PDU:
                  offset = dissect_cfdp_metadata_pdu(tvb, pinfo, cfdp_file_directive_header_tree, offset, cfdp_packet_data_length);
                  break;
  
              case NAK_PDU:
                  offset = dissect_cfdp_nak_pdu(tvb, cfdp_file_directive_header_tree, offset, cfdp_packet_data_length);
                  break;
  
              case PROMPT_PDU:
                  offset = dissect_cfdp_prompt_pdu(tvb, pinfo, cfdp_file_directive_header_tree, offset);
                  break;
  
              case KEEP_ALIVE_PDU:
                  offset = dissect_cfdp_keep_alive_pdu(tvb, cfdp_file_directive_header_tree, offset);
                  break;
  
              default:
                  break;
          }
  
          proto_item_set_end(cfdp_file_directive_header, tvb, offset);
  
      }else{
          proto_tree  *cfdp_file_data_header_tree;
  
          col_add_fstr(pinfo->cinfo, COL_INFO, "File Data PDU");
  
          cfdp_file_data_header_tree = proto_tree_add_subtree(cfdp_tree, tvb, offset, cfdp_packet_data_length,
                                                              ett_cfdp_file_data_header, NULL, "CFDP File Data");
  
          proto_tree_add_item(cfdp_file_data_header_tree, hf_cfdp_file_data_offset, tvb, offset, 4, ENC_BIG_ENDIAN);
  
          offset += 4;
  
          proto_tree_add_item(cfdp_file_data_header_tree, hf_cfdp_user_data, tvb, offset, cfdp_packet_data_length-4, ENC_NA);
          offset += cfdp_packet_data_length-4;
  
      }
      if(first_byte & HDR_CRCF){
          proto_item  *cfdp_crc;
          proto_tree  *cfdp_crc_tree;
  
          cfdp_crc_tree = proto_tree_add_subtree(cfdp_tree, tvb, offset, 2, ett_cfdp_crc, &cfdp_crc, "CRC");
  
          proto_tree_add_item(cfdp_crc_tree, hf_cfdp_crc, tvb, offset, 2, ENC_BIG_ENDIAN);
          offset += 2;
  
          proto_item_set_end(cfdp_crc, tvb, offset);
      }
      /* Give the data dissector any bytes past the CFDP packet length */
      call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo, tree);
      return tvb_captured_length(tvb);
  }
  
  void
  proto_register_cfdp(void)
  {
      static hf_register_info hf[] = {
  
          { &hf_cfdp_version,
          { "Version", "cfdp.version",
              FT_UINT8, BASE_DEC, NULL, HDR_VERSION_CFDP,
              NULL, HFILL }
          },
          { &hf_cfdp_pdu_type,
              { "PDU Type", "cfdp.pdu_type",
              FT_UINT8, BASE_DEC, VALS(cfdp_pdu_type), HDR_TYPE_CFDP,
              NULL, HFILL }
          },
          { &hf_cfdp_direction,
              { "Direction", "cfdp.direction",
              FT_UINT8, BASE_DEC, VALS(cfdp_direction), HDR_DIR,
              NULL, HFILL }
          },
          { &hf_cfdp_trans_mode,
              { "Trans. Mode", "cfdp.trans_mode",
              FT_UINT8, BASE_DEC, VALS(cfdp_trans_mode), HDR_TMODE,
              NULL, HFILL }
          },
          { &hf_cfdp_crc_flag,
              { "CRC Flag", "cfdp.crc_flag",
              FT_UINT8, BASE_DEC, VALS(cfdp_crc_flag), HDR_CRCF,
              NULL, HFILL }
          },
          { &hf_cfdp_res1,
              { "Bit reserved 1", "cfdp.res1",
              FT_UINT8, BASE_DEC, NULL, HDR_RES1,
              NULL, HFILL }
          },
          { &hf_cfdp_data_length,
              { "PDU Data length", "cfdp.data_length",
              FT_UINT16, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_res2,
              { "Bit reserved 2", "cfdp.res2",
              FT_UINT8, BASE_DEC, NULL, 0x80,
              NULL, HFILL }
          },
          { &hf_cfdp_entid_length,
              { "Length of entity IDs", "cfdp.entid_length",
              FT_UINT8, BASE_DEC, NULL, 0x70,
              NULL, HFILL }
          },
          { &hf_cfdp_res3,
              { "Bit reserved 3", "cfdp.res3",
              FT_UINT8, BASE_DEC, NULL, 0x08,
              NULL, HFILL }
          },
          { &hf_cfdp_transeqnum_length,
              { "Length of Transaction sequence number", "cfdp.transeqnum_length",
              FT_UINT8, BASE_DEC, NULL, 0x07,
              NULL, HFILL }
          },
          { &hf_cfdp_srcid,
              { "Source entity ID", "cfdp.srcid",
              FT_UINT64, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_transeqnum,
              { "Transaction sequence number", "cfdp.transeqnum",
              FT_UINT64, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_dstid,
              { "Destination entity ID", "cfdp.dstid",
              FT_UINT64, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_file_directive_type,
              { "File Directive type", "cfdp.fdtype",
              FT_UINT8, BASE_DEC, VALS(cfdp_file_directive_type), 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_file_data_offset,
              { "Offset", "cfdp.offset",
              FT_UINT32, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_progress,
              { "Progress", "cfdp.progress",
              FT_UINT32, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_dir_code_ack,
              { "PDU acknowledged", "cfdp.dir_code_ack",
              FT_UINT8, BASE_DEC, VALS(cfdp_file_directive_type), 0xf0,
              NULL, HFILL }
          },
          { &hf_cfdp_dir_subtype_ack,
              { "Directive subtype code", "cfdp.dir_subtype_ack",
              FT_UINT8, BASE_DEC, NULL, 0x0f,
              NULL, HFILL }
          },
          { &hf_cfdp_condition_code,
              { "Condition Code", "cfdp.condition_code",
              FT_UINT8, BASE_DEC, VALS(cfdp_condition_codes), 0xf0,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_one,
              { "Spare", "cfdp.spare_one",
              FT_UINT8, BASE_DEC, NULL, 0x08,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_one_2,
              { "Spare", "cfdp.spare_one_2",
              FT_UINT8, BASE_DEC, NULL, 0x80,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_two,
              { "Spare", "cfdp.spare_two",
              FT_UINT8, BASE_DEC, NULL, 0x0c,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_four,
              { "Spare", "cfdp.spare_four",
              FT_UINT8, BASE_DEC, NULL, 0x0f,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_five,
              { "Spare", "cfdp.spare_five",
              FT_UINT8, BASE_DEC, NULL, 0x3E,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_seven,
              { "Spare", "cfdp.spare_seven",
              FT_UINT8, BASE_DEC, NULL, 0x7f,
              NULL, HFILL }
          },
          { &hf_cfdp_spare_seven_2,
              { "Spare", "cfdp.spare_seven_2",
              FT_UINT8, BASE_DEC, NULL, 0xfe,
              NULL, HFILL }
          },
          { &hf_cfdp_trans_stat_ack,
              { "Transaction status", "cfdp.trans_stat_ack",
              FT_UINT8, BASE_DEC, VALS(cfdp_trans_stat_ack), 0x03,
              NULL, HFILL }
          },
          { &hf_cfdp_trans_stat,
              { "Transaction status", "cfdp.trans_stat",
              FT_UINT8, BASE_DEC, VALS(cfdp_trans_stat_ack), 0xC0,
              NULL, HFILL }
          },
          { &hf_cfdp_trans_stat_2,
              { "Transaction status", "cfdp.trans_stat_2",
              FT_UINT8, BASE_DEC, VALS(cfdp_trans_stat_ack), 0x60,
              NULL, HFILL }
          },
          { &hf_cfdp_file_checksum,
              { "Checksum", "cfdp.checksum",
              FT_UINT32, BASE_HEX, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_file_size,
              { "File size", "cfdp.file_size",
              FT_UINT32, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_end_system_stat,
              { "End system status", "cfdp.end_system_stat",
              FT_UINT8, BASE_DEC, VALS(cfdp_end_system_stat), 0x08,
              NULL, HFILL }
          },
          { &hf_cfdp_delivery_code,
              { "Delivery code", "cfdp.delivery_code",
              FT_UINT8, BASE_DEC, VALS(cfdp_delivery_code), 0x04,
              NULL, HFILL }
          },
          { &hf_cfdp_file_stat,
              { "File status", "cfdp.file_status",
              FT_UINT8, BASE_DEC, VALS(cfdp_file_stat), 0x03,
              NULL, HFILL }
          },
          { &hf_cfdp_segment_control,
              { "Segmentation control", "cfdp.segment_control",
              FT_UINT8, BASE_DEC, VALS(cfdp_segment_control), 0x80,
              NULL, HFILL }
          },
          { &hf_cfdp_tlv_len,
              { "Length", "cfdp.tlv_length",
              FT_UINT8, BASE_DEC, NULL, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_src_file_name,
              {"Source file name", "cfdp.src_file_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_dst_file_name,
              {"Destination file name", "cfdp.dst_file_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_first_file_name,
              {"First file name", "cfdp.first_file_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_second_file_name,
              {"Second file name", "cfdp.second_file_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_nak_st_scope,
              {"Start of scope", "cfdp.nak_st_scope", FT_UINT32, BASE_DEC, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_nak_sp_scope,
              {"End of scope", "cfdp.nak_sp_scope", FT_UINT32, BASE_DEC, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_crc,
              {"CRC", "cfdp.crc", FT_UINT16, BASE_HEX, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_action_code,
              {"Action code", "cfdp.action_code", FT_UINT8, BASE_DEC, VALS(cfdp_action_code), 0xF0,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_1,
              {"Status code", "cfdp.status_code_1", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_1), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_2,
              {"Status code", "cfdp.status_code_2", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_2), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_3,
              {"Status code", "cfdp.status_code_3", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_3), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_4,
              {"Status code", "cfdp.status_code_4", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_4), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_5,
              {"Status code", "cfdp.status_code_5", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_5), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_6,
              {"Status code", "cfdp.status_code_6", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_6), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_7,
              {"Status code", "cfdp.status_code_7", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_7), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_status_code_8,
              {"Status code", "cfdp.status_code_8", FT_UINT8, BASE_DEC, VALS(cfdp_status_code_8), 0x0F,
              NULL, HFILL}
          },
          { &hf_cfdp_handler_code,
              { "Handler Code", "cfdp.handler_code",
              FT_UINT8, BASE_DEC, VALS(cfdp_handler_codes), 0x0F,
              NULL, HFILL }
          },
          { &hf_cfdp_trans_mode_msg,
              { "Trans. Mode", "cfdp.trans_mode_msg",
              FT_UINT8, BASE_DEC, VALS(cfdp_trans_mode), 0x01,
              NULL, HFILL }
          },
          { &hf_cfdp_proxy_msg_type,
              { "Proxy Message Type", "cfdp.proxy_msg_type",
              FT_UINT8, BASE_DEC | BASE_EXT_STRING, &cfdp_proxy_msg_type_ext, 0x0,
              NULL, HFILL }
          },
          { &hf_cfdp_proxy_segment_control,
              { "Segmentation control", "cfdp.proxy_segment_control",
              FT_UINT8, BASE_DEC, VALS(cfdp_segment_control), 0x01,
              NULL, HFILL }
          },
          { &hf_cfdp_proxy_delivery_code,
              { "Delivery code", "cfdp.proxy_delivery_code",
              FT_UINT8, BASE_DEC, VALS(cfdp_delivery_code), 0x04,
              NULL, HFILL }
          },
          { &hf_cfdp_response_req,
              { "Response required", "cfdp.response_req",
              FT_UINT8, BASE_DEC, VALS(cfdp_response_req), 0x80,
              NULL, HFILL }
          },
          { &hf_cfdp_directory_name,
              {"Directory Name", "cfdp.directory_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_directory_file_name,
              {"Directory File Name", "cfdp.directory_file_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_listing_resp_code,
              {"Listing Response Code", "cfdp.listing_resp_code",
              FT_UINT8, BASE_DEC, VALS(cfdp_listing_resp_code), 0x80,
              NULL, HFILL}
          },
          { &hf_cfdp_report_file_name,
              {"Report File Name", "cfdp.report_file_name", FT_STRING, BASE_NONE, NULL, 0x0,
              NULL, HFILL}
          },
          { &hf_cfdp_rep_resp_code,
              {"Report Response Code", "cfdp.rep_resp_code",
              FT_UINT8, BASE_DEC, VALS(cfdp_rep_resp_code), 0x01,
              NULL, HFILL}
          },
          { &hf_cfdp_suspension_ind,
              {"Suspension indicator", "cfdp.suspension_ind",
              FT_UINT8, BASE_DEC, VALS(cfdp_suspension_ind), 0x80,
              NULL, HFILL}
          },
  
          /* Generated from convert_proto_tree_add_text.pl */
          { &hf_cfdp_filestore_message, { "Filestore Message", "cfdp.filestore_message", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
          { &hf_cfdp_entity, { "Entity", "cfdp.entity", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
          { &hf_cfdp_message_to_user, { "Message to User", "cfdp.message_to_user", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
          { &hf_cfdp_flow_label, { "Flow label", "cfdp.flow_label", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
          { &hf_cfdp_segment_requests, { "Segment requests", "cfdp.segment_requests", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
          { &hf_cfdp_user_data, { "User Data", "cfdp.user_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
  
      };
  
      /* Setup protocol subtree array */
      static gint *ett[] = {
          &ett_cfdp,
          &ett_cfdp_header,
          &ett_cfdp_file_directive_header,
          &ett_cfdp_file_data_header,
          &ett_cfdp_fault_location,
          &ett_cfdp_crc,
          &ett_cfdp_filestore_req,
          &ett_cfdp_filestore_resp,
          &ett_cfdp_msg_to_user,
          &ett_cfdp_fault_hdl_overr,
          &ett_cfdp_flow_label
      };
  
      static ei_register_info ei[] = {
          { &ei_cfdp_bad_length, { "cfdp.bad_length", PI_MALFORMED, PI_ERROR, "Bad length field", EXPFILL }},
      };
  
      expert_module_t* expert_cfdp;
  
      /* Register the protocol name and description */
      proto_cfdp = proto_register_protocol("CFDP", "CFDP", "cfdp");
  
      /* Required function calls to register the header fields and subtrees used */
      proto_register_field_array(proto_cfdp, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));
      expert_cfdp = expert_register_protocol(proto_cfdp);
      expert_register_field_array(expert_cfdp, ei, array_length(ei));
  
      cfdp_handle = register_dissector("cfdp", dissect_cfdp, proto_cfdp);
  }
  
  void
  proto_reg_handoff_cfdp(void)
  {
      dissector_add_uint("ccsds.apid", CFDP_APID, cfdp_handle);
      dissector_add_for_decode_as_with_preference("udp.port", cfdp_handle);
  }
  
  /*
   * Editor modelines - http://www.wireshark.org/tools/modelines.html
   *
   * Local variables:
   * c-basic-offset: 4
   * tab-width: 8
   * indent-tabs-mode: nil
   * End:
   *
   * vi: set shiftwidth=4 tabstop=8 expandtab:
   * :indentSize=4:tabSize=8:noTabs=true:
   */
  