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print.c

/* print.c
 * Routines for printing packet analysis trees.
 *
 * $Id: print.c 19347 2006-09-28 09:27:28Z martinm $
 *
 * Gilbert Ramirez <gram@alumni.rice.edu>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#include <string.h>

#include <epan/epan.h>
#include <epan/epan_dissect.h>
#include <epan/tvbuff.h>
#include <epan/packet.h>

#include "packet-range.h"
#include "print.h"
#include "ps.h"
#include "file_util.h"
#include <epan/charsets.h>
#include <epan/dissectors/packet-data.h>
#include <epan/dissectors/packet-frame.h>

#define PDML_VERSION "0"
#define PSML_VERSION "0"

typedef struct {
      int               level;
      print_stream_t          *stream;
      gboolean          success;
      GSList                  *src_list;
      print_dissections_e     print_dissections;
      gboolean          print_hex_for_data;
      char_enc          encoding;
      epan_dissect_t          *edt;
} print_data;

typedef struct {
      int               level;
      FILE              *fh;
      GSList                  *src_list;
      epan_dissect_t          *edt;
} write_pdml_data;

static void proto_tree_print_node(proto_node *node, gpointer data);
static void proto_tree_write_node_pdml(proto_node *node, gpointer data);
static const guint8 *get_field_data(GSList *src_list, field_info *fi);
static void write_pdml_field_hex_value(write_pdml_data *pdata, field_info *fi);
static gboolean print_hex_data_buffer(print_stream_t *stream, const guchar *cp,
    guint length, char_enc encoding);
static void ps_clean_string(unsigned char *out, const unsigned char *in,
                  int outbuf_size);
static void print_escaped_xml(FILE *fh, const char *unescaped_string);

static void print_pdml_geninfo(proto_tree *tree, FILE *fh);

static FILE *
open_print_dest(int to_file, const char *dest)
{
      FILE  *fh;

      /* Open the file or command for output */
      if (to_file)
            fh = eth_fopen(dest, "w");
      else
            fh = popen(dest, "w");

      return fh;
}

static gboolean
close_print_dest(int to_file, FILE *fh)
{
      /* Close the file or command */
      if (to_file)
            return (fclose(fh) == 0);
      else
            return (pclose(fh) == 0);
}

#define MAX_PS_LINE_LENGTH 256

gboolean
proto_tree_print(print_args_t *print_args, epan_dissect_t *edt,
    print_stream_t *stream)
{
      print_data data;

      /* Create the output */
      data.level = 0;
      data.stream = stream;
      data.success = TRUE;
      data.src_list = edt->pi.data_src;
      data.encoding = edt->pi.fd->flags.encoding;
      data.print_dissections = print_args->print_dissections;
      /* If we're printing the entire packet in hex, don't
         print uninterpreted data fields in hex as well. */
      data.print_hex_for_data = !print_args->print_hex;
      data.edt = edt;

      proto_tree_children_foreach(edt->tree, proto_tree_print_node, &data);
      return data.success;
}

#define MAX_INDENT      160

/* Print a tree's data, and any child nodes. */
static
void proto_tree_print_node(proto_node *node, gpointer data)
{
      field_info  *fi = PITEM_FINFO(node);
      print_data  *pdata = (print_data*) data;
      const guint8      *pd;
      gchar       label_str[ITEM_LABEL_LENGTH];
      gchar       *label_ptr;

      /* Don't print invisible entries. */
      if (PROTO_ITEM_IS_HIDDEN(node))
            return;

      /* Give up if we've already gotten an error. */
      if (!pdata->success)
            return;

      /* was a free format label produced? */
      if (fi->rep) {
            label_ptr = fi->rep->representation;
      }
      else { /* no, make a generic label */
            label_ptr = label_str;
            proto_item_fill_label(fi, label_str);
      }

    if(PROTO_ITEM_IS_GENERATED(node)) {
        label_ptr = g_strdup_printf("[%s]", label_ptr);
    }

      if (!print_line(pdata->stream, pdata->level, label_ptr)) {
            pdata->success = FALSE;
            return;
      }

    if(PROTO_ITEM_IS_GENERATED(node)) {
        g_free(label_ptr);
    }

      /* If it's uninterpreted data, dump it (unless our caller will
         be printing the entire packet in hex). */
      if (fi->hfinfo->id == proto_data && pdata->print_hex_for_data) {
            /*
             * Find the data for this field.
             */
            pd = get_field_data(pdata->src_list, fi);
            if (pd) {
                  if (!print_hex_data_buffer(pdata->stream, pd,
                      fi->length, pdata->encoding)) {
                        pdata->success = FALSE;
                        return;
                  }
            }
      }

      /* If we're printing all levels, or if this node is one with a
         subtree and its subtree is expanded, recurse into the subtree,
         if it exists. */
      g_assert(fi->tree_type >= -1 && fi->tree_type < num_tree_types);
      if (pdata->print_dissections == print_dissections_expanded ||
          (pdata->print_dissections == print_dissections_as_displayed &&
            fi->tree_type >= 0 && tree_is_expanded[fi->tree_type])) {
            if (node->first_child != NULL) {
                  pdata->level++;
                  proto_tree_children_foreach(node,
                        proto_tree_print_node, pdata);
                  pdata->level--;
                  if (!pdata->success)
                        return;
            }
      }
}

void
write_pdml_preamble(FILE *fh)
{
      fputs("<?xml version=\"1.0\"?>\n", fh);
      fputs("<pdml version=\"" PDML_VERSION "\" ", fh);
      fprintf(fh, "creator=\"%s/%s\">\n", PACKAGE, VERSION);
}

void
proto_tree_write_pdml(epan_dissect_t *edt, FILE *fh)
{
      write_pdml_data data;

      /* Create the output */
      data.level = 0;
      data.fh = fh;
      data.src_list = edt->pi.data_src;
      data.edt = edt;

      fprintf(fh, "<packet>\n");

      /* Print a "geninfo" protocol as required by PDML */
      print_pdml_geninfo(edt->tree, fh);

      proto_tree_children_foreach(edt->tree, proto_tree_write_node_pdml,
          &data);

      fprintf(fh, "</packet>\n\n");
}

/* Write out a tree's data, and any child nodes, as PDML */
static void
proto_tree_write_node_pdml(proto_node *node, gpointer data)
{
      field_info  *fi = PITEM_FINFO(node);
      write_pdml_data   *pdata = (write_pdml_data*) data;
      const gchar *label_ptr;
      gchar       label_str[ITEM_LABEL_LENGTH];
      char        *dfilter_string;
      int         chop_len;
      int         i;

      for (i = -1; i < pdata->level; i++) {
            fputs("  ", pdata->fh);
      }

      /* Text label. It's printed as a field with no name. */
      if (fi->hfinfo->id == hf_text_only) {
            /* Get the text */
            if (fi->rep) {
                  label_ptr = fi->rep->representation;
            }
            else {
                  label_ptr = "";
            }

            fputs("<field show=\"", pdata->fh);
            print_escaped_xml(pdata->fh, label_ptr);

            fprintf(pdata->fh, "\" size=\"%d", fi->length);
            fprintf(pdata->fh, "\" pos=\"%d", fi->start);

            fputs("\" value=\"", pdata->fh);
            write_pdml_field_hex_value(pdata, fi);

            if (node->first_child != NULL) {
                  fputs("\">\n", pdata->fh);
            }
            else {
                  fputs("\"/>\n", pdata->fh);
            }
      }
      /* Uninterpreted data, i.e., the "Data" protocol, is
       * printed as a field instead of a protocol. */
      else if (fi->hfinfo->id == proto_data) {

            fputs("<field name=\"data\" value=\"", pdata->fh);

            write_pdml_field_hex_value(pdata, fi);

            fputs("\"/>\n", pdata->fh);

      }
      /* Normal protocols and fields */
      else {
            if (fi->hfinfo->type == FT_PROTOCOL) {
                  fputs("<proto name=\"", pdata->fh);
            }
            else {
                  fputs("<field name=\"", pdata->fh);
            }
            print_escaped_xml(pdata->fh, fi->hfinfo->abbrev);

#if 0
      /* PDML spec, see: 
       * http://analyzer.polito.it/30alpha/docs/dissectors/PDMLSpec.htm
       *
       * the show fields contains things in 'human readable' format
       * showname: contains only the name of the field
       * show: contains only the data of the field
       * showdtl: contains additional details of the field data
       * showmap: contains mappings of the field data (e.g. the hostname to an IP address)
       *
       * XXX - the showname shouldn't contain the field data itself 
       * (like it's contained in the fi->rep->representation). 
       * Unfortunately, we don't have the field data representation for 
       * all fields, so this isn't currently possible */
            fputs("\" showname=\"", pdata->fh);
            print_escaped_xml(pdata->fh, fi->hfinfo->name);
#endif

            if (fi->rep) {
                  fputs("\" showname=\"", pdata->fh);
                  print_escaped_xml(pdata->fh, fi->rep->representation);
            }
            else {
                  label_ptr = label_str;
                  proto_item_fill_label(fi, label_str);
                  fputs("\" showname=\"", pdata->fh);
                  print_escaped_xml(pdata->fh, label_ptr);
            }

            if (PROTO_ITEM_IS_HIDDEN(node))
                  fprintf(pdata->fh, "\" hide=\"yes");

            fprintf(pdata->fh, "\" size=\"%d", fi->length);
            fprintf(pdata->fh, "\" pos=\"%d", fi->start);
/*          fprintf(pdata->fh, "\" id=\"%d", fi->hfinfo->id);*/

            /* show, value, and unmaskedvalue attributes */
            switch (fi->hfinfo->type)
            {
            case FT_PROTOCOL:
                  break;
            case FT_NONE:
                  fputs("\" show=\"\" value=\"",  pdata->fh);
                  break;
            default:
                  /* XXX - this is a hack until we can just call
                   * fvalue_to_string_repr() for *all* FT_* types. */
                  dfilter_string = proto_construct_dfilter_string(fi,
                              pdata->edt);
                  if (dfilter_string != NULL) {
                        chop_len = strlen(fi->hfinfo->abbrev) + 4; /* for " == " */

                        /* XXX - Remove double-quotes. Again, once we
                         * can call fvalue_to_string_repr(), we can
                         * ask it not to produce the version for
                         * display-filters, and thus, no
                         * double-quotes. */
                        if (dfilter_string[strlen(dfilter_string)-1] == '"') {
                              dfilter_string[strlen(dfilter_string)-1] = '\0';
                              chop_len++;
                        }

                        fputs("\" show=\"", pdata->fh);
                        print_escaped_xml(pdata->fh, &dfilter_string[chop_len]);
                  }
                  if (fi->length > 0) {
                        fputs("\" value=\"", pdata->fh);

                        if (fi->hfinfo->bitmask!=0) {
                              fprintf(pdata->fh, "%X", fvalue_get_integer(&fi->value));
                              fputs("\" unmaskedvalue=\"", pdata->fh);
                              write_pdml_field_hex_value(pdata, fi);
                        }
                        else {
                    write_pdml_field_hex_value(pdata, fi);
                }
                  }
            }

            if (node->first_child != NULL) {
                  fputs("\">\n", pdata->fh);
            }
            else if (fi->hfinfo->id == proto_data) {
                  fputs("\">\n", pdata->fh);
            }
            else {
                  fputs("\"/>\n", pdata->fh);
            }
      }

      /* We always print all levels for PDML. Recurse here. */
      if (node->first_child != NULL) {
            pdata->level++;
            proto_tree_children_foreach(node,
                        proto_tree_write_node_pdml, pdata);
            pdata->level--;
      }

      if (node->first_child != NULL) {
            for (i = -1; i < pdata->level; i++) {
                  fputs("  ", pdata->fh);
            }
            if (fi->hfinfo->type == FT_PROTOCOL) {
                  fputs("</proto>\n", pdata->fh);
            }
            else {
                  fputs("</field>\n", pdata->fh);
            }
      }
}

/* Print info for a 'geninfo' pseudo-protocol. This is required by
 * the PDML spec. The information is contained in Wireshark's 'frame' protocol,
 * but we produce a 'geninfo' protocol in the PDML to conform to spec.
 * The 'frame' protocol follows the 'geninfo' protocol in the PDML. */
static void
print_pdml_geninfo(proto_tree *tree, FILE *fh)
{
      guint32 num, len, caplen;
      nstime_t *timestamp;
      GPtrArray *finfo_array;
      field_info *frame_finfo;

      /* Get frame protocol's finfo. */
      finfo_array = proto_find_finfo(tree, proto_frame);
      if (g_ptr_array_len(finfo_array) < 1) {
            return;
      }
      frame_finfo = finfo_array->pdata[0];
      g_ptr_array_free(finfo_array, FALSE);

      /* frame.number --> geninfo.num */
      finfo_array = proto_find_finfo(tree, hf_frame_number);
      if (g_ptr_array_len(finfo_array) < 1) {
            return;
      }
      num = fvalue_get_integer(&((field_info*)finfo_array->pdata[0])->value);
      g_ptr_array_free(finfo_array, FALSE);

      /* frame.pkt_len --> geninfo.len */
      finfo_array = proto_find_finfo(tree, hf_frame_packet_len);
      if (g_ptr_array_len(finfo_array) < 1) {
            return;
      }
      len = fvalue_get_integer(&((field_info*)finfo_array->pdata[0])->value);
      g_ptr_array_free(finfo_array, FALSE);

      /* frame.cap_len --> geninfo.caplen */
      finfo_array = proto_find_finfo(tree, hf_frame_capture_len);
      if (g_ptr_array_len(finfo_array) < 1) {
            return;
      }
      caplen = fvalue_get_integer(&((field_info*)finfo_array->pdata[0])->value);
      g_ptr_array_free(finfo_array, FALSE);

      /* frame.time --> geninfo.timestamp */
      finfo_array = proto_find_finfo(tree, hf_frame_arrival_time);
      if (g_ptr_array_len(finfo_array) < 1) {
            return;
      }
      timestamp = fvalue_get(&((field_info*)finfo_array->pdata[0])->value);
      g_ptr_array_free(finfo_array, FALSE);

      /* Print geninfo start */
      fprintf(fh,
"  <proto name=\"geninfo\" pos=\"0\" showname=\"General information\" size=\"%u\">\n",
            frame_finfo->length);

      /* Print geninfo.num */
      fprintf(fh,
"    <field name=\"num\" pos=\"0\" show=\"%u\" showname=\"Number\" value=\"%x\" size=\"%u\"/>\n",
            num, num, frame_finfo->length);

      /* Print geninfo.len */
      fprintf(fh,
"    <field name=\"len\" pos=\"0\" show=\"%u\" showname=\"Packet Length\" value=\"%x\" size=\"%u\"/>\n",
            len, len, frame_finfo->length);

      /* Print geninfo.caplen */
      fprintf(fh,
"    <field name=\"caplen\" pos=\"0\" show=\"%u\" showname=\"Captured Length\" value=\"%x\" size=\"%u\"/>\n",
            caplen, caplen, frame_finfo->length);

      /* Print geninfo.timestamp */
      fprintf(fh,
"    <field name=\"timestamp\" pos=\"0\" show=\"%s\" showname=\"Captured Time\" value=\"%d.%09d\" size=\"%u\"/>\n",
            abs_time_to_str(timestamp), (int) timestamp->secs, timestamp->nsecs, frame_finfo->length);

      /* Print geninfo end */
      fprintf(fh,
"  </proto>\n");
}

void
write_pdml_finale(FILE *fh)
{
      fputs("</pdml>\n", fh);
}

void
write_psml_preamble(FILE *fh)
{
      fputs("<?xml version=\"1.0\"?>\n", fh);
      fputs("<psml version=\"" PSML_VERSION "\" ", fh);
      fprintf(fh, "creator=\"%s/%s\">\n", PACKAGE, VERSION);
}

void
proto_tree_write_psml(epan_dissect_t *edt, FILE *fh)
{
      gint  i;

      /* if this is the first packet, we have to create the PSML structure output */
      if(edt->pi.fd->num == 1) {
          fprintf(fh, "<structure>\n");

          for(i=0; i < edt->pi.cinfo->num_cols; i++) {
            fprintf(fh, "<section>");
            print_escaped_xml(fh, edt->pi.cinfo->col_title[i]);
            fprintf(fh, "</section>\n");
          }

          fprintf(fh, "</structure>\n\n");
      }

      fprintf(fh, "<packet>\n");

      for(i=0; i < edt->pi.cinfo->num_cols; i++) {
          fprintf(fh, "<section>");
          print_escaped_xml(fh, edt->pi.cinfo->col_data[i]);
          fprintf(fh, "</section>\n");
      }

      fprintf(fh, "</packet>\n\n");
}

void
write_psml_finale(FILE *fh)
{
      fputs("</psml>\n", fh);
}

void
write_csv_preamble(FILE *fh _U_)
{

}

void
proto_tree_write_csv(epan_dissect_t *edt, FILE *fh)
{
        gint    i;

        /* if this is the first packet, we have to write the CSV header */
        if(edt->pi.fd->num == 1) {
            for(i=0; i < edt->pi.cinfo->num_cols - 1; i++)
              fprintf(fh, "\"%s\", ", edt->pi.cinfo->col_title[i]);

            fprintf(fh, "\"%s\"\n", edt->pi.cinfo->col_title[i]);
        }

        for(i=0; i < edt->pi.cinfo->num_cols - 1; i++)
            fprintf(fh, "\"%s\", ", edt->pi.cinfo->col_data[i]);

        fprintf(fh, "\"%s\"\n", edt->pi.cinfo->col_data[i]);
}

void
write_csv_finale(FILE *fh _U_)
{

}

/*
 * Find the data source for a specified field, and return a pointer
 * to the data in it. Returns NULL if the data is out of bounds.
 */
static const guint8 *
get_field_data(GSList *src_list, field_info *fi)
{
      GSList *src_le;
      data_source *src;
      tvbuff_t *src_tvb;
      gint length, tvbuff_length;

      for (src_le = src_list; src_le != NULL; src_le = src_le->next) {
            src = src_le->data;
            src_tvb = src->tvb;
            if (fi->ds_tvb == src_tvb) {
                  /*
                   * Found it.
                   *
                   * XXX - a field can have a length that runs past
                   * the end of the tvbuff.  Ideally, that should
                   * be fixed when adding an item to the protocol
                   * tree, but checking the length when doing
                   * that could be expensive.  Until we fix that,
                   * we'll do the check here.
                   */
                  tvbuff_length = tvb_length_remaining(src_tvb,
                      fi->start);
                  if (tvbuff_length < 0) {
                        return NULL;
                  }
                  length = fi->length;
                  if (length > tvbuff_length)
                        length = tvbuff_length;
                  return tvb_get_ptr(src_tvb, fi->start, length);
            }
      }
      g_assert_not_reached();
      return NULL;      /* not found */
}

/* Print a string, escaping out certain characters that need to
 * escaped out for XML. */
static void
print_escaped_xml(FILE *fh, const char *unescaped_string)
{
      const unsigned char *p;

      for (p = unescaped_string; *p != '\0'; p++) {
            switch (*p) {
                  case '&':
                        fputs("&amp;", fh);
                        break;
                  case '<':
                        fputs("&lt;", fh);
                        break;
                  case '>':
                        fputs("&gt;", fh);
                        break;
                  case '"':
                        fputs("&quot;", fh);
                        break;
                  case '\'':
                        fputs("&apos;", fh);
                        break;
                  default:
                        fputc(*p, fh);
            }
      }
}

static void
write_pdml_field_hex_value(write_pdml_data *pdata, field_info *fi)
{
      int i;
      const guint8 *pd;

      if (fi->length > tvb_length_remaining(fi->ds_tvb, fi->start)) {
            fprintf(pdata->fh, "field length invalid!");
            return;
      }

      /* Find the data for this field. */
      pd = get_field_data(pdata->src_list, fi);

      if (pd) {
            /* Print a simple hex dump */
            for (i = 0 ; i < fi->length; i++) {
                  fprintf(pdata->fh, "%02x", pd[i]);
            }
      }
}

gboolean
print_hex_data(print_stream_t *stream, epan_dissect_t *edt)
{
      gboolean multiple_sources;
      GSList *src_le;
      data_source *src;
      tvbuff_t *tvb;
      char *name;
      char *line;
      const guchar *cp;
      guint length;

      /*
       * Set "multiple_sources" iff this frame has more than one
       * data source; if it does, we need to print the name of
       * the data source before printing the data from the
       * data source.
       */
      multiple_sources = (edt->pi.data_src->next != NULL);

      for (src_le = edt->pi.data_src; src_le != NULL;
          src_le = src_le->next) {
            src = src_le->data;
            tvb = src->tvb;
            if (multiple_sources) {
                  name = src->name;
                  print_line(stream, 0, "");
                  line = g_malloc(strlen(name) + 2);  /* <name>:\0 */
                  strcpy(line, name);
                  strcat(line, ":");
                  print_line(stream, 0, line);
                  g_free(line);
            }
            length = tvb_length(tvb);
            if (length == 0)
                return TRUE;
            cp = tvb_get_ptr(tvb, 0, length);
            if (!print_hex_data_buffer(stream, cp, length,
                edt->pi.fd->flags.encoding))
                  return FALSE;
      }
      return TRUE;
}

/*
 * This routine is based on a routine created by Dan Lasley
 * <DLASLEY@PROMUS.com>.
 *
 * It was modified for Wireshark by Gilbert Ramirez and others.
 */

#define MAX_OFFSET_LEN  8     /* max length of hex offset of bytes */
#define BYTES_PER_LINE  16    /* max byte values printed on a line */
#define HEX_DUMP_LEN    (BYTES_PER_LINE*3)
                        /* max number of characters hex dump takes -
                           2 digits plus trailing blank */
#define DATA_DUMP_LEN   (HEX_DUMP_LEN + 2 + BYTES_PER_LINE)
                        /* number of characters those bytes take;
                           3 characters per byte of hex dump,
                           2 blanks separating hex from ASCII,
                           1 character per byte of ASCII dump */
#define MAX_LINE_LEN    (MAX_OFFSET_LEN + 2 + DATA_DUMP_LEN)
                        /* number of characters per line;
                           offset, 2 blanks separating offset
                           from data dump, data dump */

static gboolean
print_hex_data_buffer(print_stream_t *stream, const guchar *cp,
    guint length, char_enc encoding)
{
      register unsigned int ad, i, j, k, l;
      guchar c;
      guchar line[MAX_LINE_LEN + 1];
      unsigned int use_digits;
      static guchar binhex[16] = {
            '0', '1', '2', '3', '4', '5', '6', '7',
            '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

      if (!print_line(stream, 0, ""))
            return FALSE;

      /*
       * How many of the leading digits of the offset will we supply?
       * We always supply at least 4 digits, but if the maximum offset
       * won't fit in 4 digits, we use as many digits as will be needed.
       */
      if (((length - 1) & 0xF0000000) != 0)
            use_digits = 8;   /* need all 8 digits */
      else if (((length - 1) & 0x0F000000) != 0)
            use_digits = 7;   /* need 7 digits */
      else if (((length - 1) & 0x00F00000) != 0)
            use_digits = 6;   /* need 6 digits */
      else if (((length - 1) & 0x000F0000) != 0)
            use_digits = 5;   /* need 5 digits */
      else
            use_digits = 4;   /* we'll supply 4 digits */

      ad = 0;
      i = 0;
      j = 0;
      k = 0;
      while (i < length) {
            if ((i & 15) == 0) {
                  /*
                   * Start of a new line.
                   */
                  j = 0;
                  k = 0;
                  l = use_digits;
                  do {
                        l--;
                        c = (ad >> (l*4)) & 0xF;
                        line[j++] = binhex[c];
                  } while (l != 0);
                  line[j++] = ' ';
                  line[j++] = ' ';
                  memset(line+j, ' ', DATA_DUMP_LEN);

                  /*
                   * Offset in line of ASCII dump.
                   */
                  k = j + HEX_DUMP_LEN + 2;
            }
            c = *cp++;
            line[j++] = binhex[c>>4];
            line[j++] = binhex[c&0xf];
            j++;
            if (encoding == CHAR_EBCDIC) {
                  c = EBCDIC_to_ASCII1(c);
            }
            line[k++] = c >= ' ' && c < 0x7f ? c : '.';
            i++;
            if ((i & 15) == 0 || i == length) {
                  /*
                   * We'll be starting a new line, or
                   * we're finished printing this buffer;
                   * dump out the line we've constructed,
                   * and advance the offset.
                   */
                  line[k] = '\0';
                  if (!print_line(stream, 0, line))
                        return FALSE;
                  ad += 16;
            }
      }
      return TRUE;
}

static
void ps_clean_string(unsigned char *out, const unsigned char *in,
                  int outbuf_size)
{
      int rd, wr;
      char c;

      for (rd = 0, wr = 0 ; wr < outbuf_size; rd++, wr++ ) {
            c = in[rd];
            switch (c) {
                  case '(':
                  case ')':
                  case '\\':
                        out[wr] = '\\';
                        out[++wr] = c;
                        break;

                  default:
                        out[wr] = c;
                        break;
            }

            if (c == 0) {
                  break;
            }
      }
}

/* Some formats need stuff at the beginning of the output */
gboolean
print_preamble(print_stream_t *self, gchar *filename)
{
      return (self->ops->print_preamble)(self, filename);
}

gboolean
print_line(print_stream_t *self, int indent, const char *line)
{
      return (self->ops->print_line)(self, indent, line);
}

/* Insert bookmark */
gboolean
print_bookmark(print_stream_t *self, const gchar *name, const gchar *title)
{
      return (self->ops->print_bookmark)(self, name, title);
}

gboolean
new_page(print_stream_t *self)
{
      return (self->ops->new_page)(self);
}

/* Some formats need stuff at the end of the output */
gboolean
print_finale(print_stream_t *self)
{
      return (self->ops->print_finale)(self);
}

gboolean
destroy_print_stream(print_stream_t *self)
{
      return (self->ops->destroy)(self);
}

typedef struct {
      int to_file;
      FILE *fh;
} output_text;

static gboolean
print_preamble_text(print_stream_t *self _U_, gchar *filename _U_)
{
      /* do nothing */
      return TRUE;      /* always succeeds */
}

static gboolean
print_line_text(print_stream_t *self, int indent, const char *line)
{
      output_text *output = self->data;
      char space[MAX_INDENT+1];
      int i;
      int num_spaces;

      /* Prepare the tabs for printing, depending on tree level */
      num_spaces = indent * 4;
      if (num_spaces > MAX_INDENT) {
            num_spaces = MAX_INDENT;
      }
      for (i = 0; i < num_spaces; i++) {
            space[i] = ' ';
      }
      /* The string is NUL-terminated */
      space[num_spaces] = '\0';

      fputs(space, output->fh);
      fputs(line, output->fh);
      putc('\n', output->fh);
      return !ferror(output->fh);
}

static gboolean
print_bookmark_text(print_stream_t *self _U_, const gchar *name _U_,
    const gchar *title _U_)
{
      /* do nothing */
      return TRUE;
}

static gboolean
new_page_text(print_stream_t *self)
{
      output_text *output = self->data;

      fputs("\f", output->fh);
      return !ferror(output->fh);
}

static gboolean
print_finale_text(print_stream_t *self _U_)
{
      /* do nothing */
      return TRUE;      /* always succeeds */
}

static gboolean
destroy_text(print_stream_t *self)
{
      output_text *output = self->data;
      gboolean ret;

      ret = close_print_dest(output->to_file, output->fh);
      g_free(output);
      g_free(self);
      return ret;
}

static const print_stream_ops_t print_text_ops = {
      print_preamble_text,
      print_line_text,
      print_bookmark_text,
      new_page_text,
      print_finale_text,
      destroy_text
};

print_stream_t *
print_stream_text_new(int to_file, const char *dest)
{
      FILE *fh;
      print_stream_t *stream;
      output_text *output;

      fh = open_print_dest(to_file, dest);
      if (fh == NULL)
            return NULL;

      output = g_malloc(sizeof *output);
      output->to_file = to_file;
      output->fh = fh;
      stream = g_malloc(sizeof (print_stream_t));
      stream->ops = &print_text_ops;
      stream->data = output;

      return stream;
}

print_stream_t *
print_stream_text_stdio_new(FILE *fh)
{
      print_stream_t *stream;
      output_text *output;

      output = g_malloc(sizeof *output);
      output->to_file = TRUE;
      output->fh = fh;
      stream = g_malloc(sizeof (print_stream_t));
      stream->ops = &print_text_ops;
      stream->data = output;

      return stream;
}

typedef struct {
      int to_file;
      FILE *fh;
} output_ps;

static gboolean
print_preamble_ps(print_stream_t *self, gchar *filename)
{
      output_ps *output = self->data;
      char        psbuffer[MAX_PS_LINE_LENGTH]; /* static sized buffer! */

      print_ps_preamble(output->fh);

      fputs("%% Set the font to 10 point\n", output->fh);
      fputs("/Courier findfont 10 scalefont setfont\n", output->fh);
      fputs("\n", output->fh);
      fputs("%% the page title\n", output->fh);
      ps_clean_string(psbuffer, filename, MAX_PS_LINE_LENGTH);
      fprintf(output->fh, "/eth_pagetitle (%s - Wireshark) def\n", psbuffer);
      fputs("\n", output->fh);
      return !ferror(output->fh);
}

static gboolean
print_line_ps(print_stream_t *self, int indent, const char *line)
{
      output_ps *output = self->data;
      char        psbuffer[MAX_PS_LINE_LENGTH]; /* static sized buffer! */

      ps_clean_string(psbuffer, line, MAX_PS_LINE_LENGTH);
      fprintf(output->fh, "%d (%s) putline\n", indent, psbuffer);
      return !ferror(output->fh);
}

static gboolean
print_bookmark_ps(print_stream_t *self, const gchar *name, const gchar *title)
{
      output_ps *output = self->data;
      char        psbuffer[MAX_PS_LINE_LENGTH]; /* static sized buffer! */

      /*
       * See the Adobe "pdfmark reference":
       *
       *    http://partners.adobe.com/asn/acrobat/docs/pdfmark.pdf
       *
       * The pdfmark stuff tells code that turns PostScript into PDF
       * things that it should do.
       *
       * The /OUT stuff creates a bookmark that goes to the
       * destination with "name" as the name and "title" as the title.
       *
       * The "/DEST" creates the destination.
       */
      ps_clean_string(psbuffer, title, MAX_PS_LINE_LENGTH);
      fprintf(output->fh, "[/Dest /%s /Title (%s)   /OUT pdfmark\n", name,
          psbuffer);
      fputs("[/View [/XYZ -4 currentpoint matrix currentmatrix matrix defaultmatrix\n",
          output->fh);
      fputs("matrix invertmatrix matrix concatmatrix transform exch pop 20 add null]\n",
          output->fh);
      fprintf(output->fh, "/Dest /%s /DEST pdfmark\n", name);
      return !ferror(output->fh);
}

static gboolean
new_page_ps(print_stream_t *self)
{
      output_ps *output = self->data;

      fputs("formfeed\n", output->fh);
      return !ferror(output->fh);
}

static gboolean
print_finale_ps(print_stream_t *self)
{
      output_ps *output = self->data;

      print_ps_finale(output->fh);
      return !ferror(output->fh);
}

static gboolean
destroy_ps(print_stream_t *self)
{
      output_ps *output = self->data;
      gboolean ret;

      ret = close_print_dest(output->to_file, output->fh);
      g_free(output);
      g_free(self);
      return ret;
}

static const print_stream_ops_t print_ps_ops = {
      print_preamble_ps,
      print_line_ps,
      print_bookmark_ps,
      new_page_ps,
      print_finale_ps,
      destroy_ps
};

print_stream_t *
print_stream_ps_new(int to_file, const char *dest)
{
      FILE *fh;
      print_stream_t *stream;
      output_ps *output;

      fh = open_print_dest(to_file, dest);
      if (fh == NULL)
            return NULL;

      output = g_malloc(sizeof *output);
      output->to_file = to_file;
      output->fh = fh;
      stream = g_malloc(sizeof (print_stream_t));
      stream->ops = &print_ps_ops;
      stream->data = output;

      return stream;
}

print_stream_t *
print_stream_ps_stdio_new(FILE *fh)
{
      print_stream_t *stream;
      output_ps *output;

      output = g_malloc(sizeof *output);
      output->to_file = TRUE;
      output->fh = fh;
      stream = g_malloc(sizeof (print_stream_t));
      stream->ops = &print_ps_ops;
      stream->data = output;

      return stream;
}

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