This file is indexed.

/usr/share/perl5/Image/ExifTool/HtmlDump.pm is in libimage-exiftool-perl 10.10-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
#------------------------------------------------------------------------------
# File:         HtmlDump.pm
#
# Description:  Dump information in hex to HTML page
#
# Revisions:    12/05/2005 - P. Harvey Created
#------------------------------------------------------------------------------

package Image::ExifTool::HtmlDump;

use strict;
use vars qw($VERSION);
use Image::ExifTool;    # only for FinishTiffDump()
use Image::ExifTool::HTML qw(EscapeHTML);

$VERSION = '1.33';

sub DumpTable($$$;$$$$$);
sub Open($$$;@);
sub Write($@);

my ($bkgStart, $bkgEnd, @bkgSpan);

my $htmlHeader1 = <<_END_PART_1_;
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
 "http://www.w3.org/TR/1998/REC-html40-19980424/loose.dtd">
<html>
<head>
<title>
_END_PART_1_

# Note: Don't change font-weight style because it can affect line height
my $htmlHeader2 = <<_END_PART_2_;
</title>
<style type="text/css">
<!--
/* character style ID's */
.D { color: #000000 } /* default color */
.V { color: #ff0000 } /* duplicate block 1 */
.W { color: #004400 } /* normal block 1 */
.X { color: #ff4488 } /* duplicate block 2 */
.Y { color: #448844 } /* normal block 2 */
.U { color: #cc8844 } /* unused data block */
.H { color: #0000ff } /* highlighted tag name */
.F { color: #aa00dd } /* actual offset differs */
.M { text-decoration: underline } /* maker notes data */
.tt { /* tooltip text */
    visibility: hidden;
    position: absolute;
    white-space: nowrap;
    top: 0;
    left: 0;
    font-family: Verdana, sans-serif;
    font-size: .7em;
    padding: 2px 4px;
    border: 1px solid gray;
    z-index: 3;
}
.tb { /* tooltip background */
    visibility: hidden;
    position: absolute;
    background: #ffffdd;
    zoom: 1;
    -moz-opacity: 0.8;
    -khtml-opacity: 0.8;
    -ms-filter: 'progid:DXImageTransform.Microsoft.Alpha(Opacity=80)';
    filter: alpha(opacity=80);
    opacity: 0.8;
    z-index: 2;
}
/* table styles */
table.dump {
  border-top: 1px solid gray;
  border-bottom: 1px solid gray;
}
table.dump td { padding: .2em .3em }
td.c2 {
  border-left: 1px solid gray;
  border-right: 1px solid gray;
}
pre   { margin: 0 }
table { font-size: .9em }
body  { color: black; background: white }
-->
</style>
<script language="JavaScript" type="text/JavaScript">
<!-- Begin
// tooltip positioning constants
var TMAR = 4;   // top/left margins
var BMAR = 16;  // bottom/right margins (scrollbars may overhang inner dimensions)
var XOFF = 10;  // x offset from cursor
var YOFF = 40;  // y offset
var YMIN = 10;  // minimum y offset
var YTOP = 20;  // y offset when above cursor
// common variables
var safari1 = navigator.userAgent.indexOf("Safari/312.6") >= 0;
var ie6 = navigator.userAgent.toLowerCase().indexOf('msie 6') >= 0;
var mspan = new Array;
var hlist, tt, tb;

function GetElementsByClass(classname, tagname) {
  var found = new Array();
  var list = document.getElementsByTagName(tagname);
  var len = list.length;
  for (var i=0, j=0; i<len; ++i) {
    var classes = list[i].className.split(' ');
    for (var k=0; k<classes.length; ++k) {
      if (classes[k] == classname) {
        found[j++] = list[i];
        break;
      }
    }
  }
  delete list;
  return found;
}

// move tooltip
function move(e)
{
  if (!tt) return;
  if (ie6 && (tt.style.top  == '' || tt.style.top  == 0) &&
             (tt.style.left == '' || tt.style.left == 0))
  {
    tt.style.width  = tt.offsetWidth  + 'px';
    tt.style.height = tt.offsetHeight + 'px';
  }
  var w, h;
  // browser inconsistencies make getting window size more complex than it should be,
  // and even then we don't know if it is smaller due to scrollbar width
  if (typeof(window.innerWidth) == 'number') {
    w = window.innerWidth;
    h = window.innerHeight;
  } else if (document.documentElement && document.documentElement.clientWidth) {
    w = document.documentElement.clientWidth;
    h = document.documentElement.clientHeight;
  } else {
    w = document.body.clientWidth;
    h = document.body.clientHeight;
  }
  var x = e.clientX + XOFF;
  var y = e.clientY + YOFF;
  if (safari1) { // patch for people still using OS X 10.3.9
    x -= document.body.scrollLeft + document.documentElement.scrollLeft;
    y -= document.body.scrollTop  + document.documentElement.scrollTop;
  }
  var mx = w - BMAR - tt.offsetWidth;
  var my = h - BMAR - tt.offsetHeight;
  if (y > my + YOFF - YMIN) y = e.clientY - YTOP - tt.offsetHeight;
  if (x > mx) x = mx;
  if (y > my) y = my;
  if (x < TMAR) x = TMAR;
  if (y < TMAR) y = TMAR;
  x += document.body.scrollLeft + document.documentElement.scrollLeft;
  y += document.body.scrollTop  + document.documentElement.scrollTop;
  tb.style.width  = tt.offsetWidth  + 'px';
  tb.style.height = tt.offsetHeight + 'px';
  tt.style.top  = tb.style.top  = y + 'px';
  tt.style.left = tb.style.left = x + 'px';
  tt.style.visibility = tb.style.visibility = 'visible';
}

// highlight/unhighlight text
function high(e,on) {
  var targ;
  if (e.target) targ = e.target;
  else if (e.srcElement) targ = e.srcElement;
  if (targ.nodeType == 3) targ = targ.parentNode; // defeat Safari bug
  if (!targ.name) targ = targ.parentNode; // go up another level if necessary
  if (targ.name && document.getElementsByName) {
    // un-highlight current objects
    if (hlist) {
      for (var i=0; i<hlist.length; ++i) {
        hlist[i].style.background = 'transparent';
      }
      hlist = null;
    }
    if (tt) {
      // hide old tooltip
      tt.style.visibility = tb.style.visibility = 'hidden';
      tt = null;
    }
    if (on) {
      if (targ.name.substring(0,1) == 't') {
        // show our tooltip (ID is different than name to avoid confusing IE)
        tt = document.getElementById('p' + targ.name.substring(1));
        if (tt) {
          tb = document.getElementById('tb');
          move(e);
        }
      }
      // highlight anchor elements with the same name
      hlist = document.getElementsByName(targ.name);
      // use class name to highlight span elements if necessary
      for (var i=0; i<mspan.length; ++i) {
        if (mspan[i] != targ.name) continue;
        var slist = GetElementsByClass(targ.name, 'span');
        // add elements from hlist collection to our array
        for (var j=0; j<hlist.length; ++j) {
            slist[slist.length] = hlist[j];
        }
        hlist = slist;
        break;
      }
      for (var j=0; j<hlist.length; ++j) {
        hlist[j].style.background = '#ffcc99';
      }
    }
  }
}
_END_PART_2_

my $htmlHeader3 = q[
// End --->
</script></head>
<body><noscript><b class=V>--&gt;
Enable JavaScript for active highlighting and information tool tips!
</b></noscript>
<table class=dump cellspacing=0 cellpadding=2>
<tr><td valign='top'><pre>];

my $preMouse = q(<pre onmouseover="high(event,1)" onmouseout="high(event,0)" onmousemove="move(event)">);

#------------------------------------------------------------------------------
# New - create new HtmlDump object
# Inputs: 0) reference to HtmlDump object or HtmlDump class name
sub new
{
    local $_;
    my $that = shift;
    my $class = ref($that) || $that || 'Image::ExifTool::HtmlDump';
    return bless { Block => {}, TipNum => 0 }, $class;
}

#------------------------------------------------------------------------------
# Add information to dump
# Inputs: 0) HTML dump hash ref, 1) absolute offset in file, 2) data size,
#         3) comment string, 4) tool tip (or SAME to use previous tip),
#         5) bit flags (see below)
# Bits: 0x01 - print at start of line
#       0x02 - print red address
#       0x04 - maker notes data ('M'-class span)
#       0x08 - limit block length
#       0x10 - allow double references
#       0x100 - (reserved)
# Notes: Block will be shown in 'unused' color if comment string begins with '['
sub Add($$$$;$)
{
    my ($self, $start, $size, $msg, $tip, $flag) = @_;
    my $block = $$self{Block};
    $$block{$start} or $$block{$start} = [ ];
    my $htip;
    if ($tip and $tip eq 'SAME') {
        $htip = '';
    } else {
        # use message as first line of tip, and make bold unless in brackets
        $htip = ($msg =~ /^[[(]/) ? $msg : "<b>$msg</b>";
        if (defined $tip) {
            ($tip = EscapeHTML($tip)) =~ s/\n/<br>/g;   # HTML-ize tooltip text
            $htip .= '<br>' . $tip;
        }
        # add size if not already done
        $htip .= "<br>($size bytes)" unless $htip =~ /<br>Size:/;
        ++$self->{TipNum};
    }
    push @{$$block{$start}}, [ $size, $msg, $htip, $flag, $self->{TipNum} ];
}

#------------------------------------------------------------------------------
# Print dump information to HTML page
# Inputs: 0) Dump information hash reference, 1) source file RAF reference,
#         2) data pointer, 3) data position, 4) output file or scalar reference,
#         5) limit level (1-3), 6) title
# Returns: non-zero if useful output was generated,
#          or -1 on error loading data and "ERROR" is set to offending data name
# Note: The "Error" member may be set externally to print a specific error
#       message instead of doing the dump.
sub Print($$;$$$$$)
{
    local $_;
    my ($self, $raf, $dataPt, $dataPos, $outfile, $level, $title) = @_;
    my ($i, $buff, $rtnVal, $limit, $err);
    my $block = $$self{Block};
    $dataPos = 0 unless $dataPos;
    $outfile = \*STDOUT unless ref $outfile;
    $title = 'HtmlDump' unless $title;
    $level or $level = 0;
    my $tell = $raf->Tell();
    my $pos = 0;
    my $dataEnd = $dataPos + ($dataPt ? length($$dataPt) : 0);
    # initialize member variables
    $$self{Open} = [];
    $$self{Closed} = [];
    $$self{TipList} = [];
    $$self{MSpanList} = [];
    $$self{Cols} = [ '', '', '', '' ];  # text columns
    # set dump size limits (limits are 4x smaller if bit 0x08 set in flags)
    if ($level <= 1) {
        $limit = 1024;
    } elsif ($level <= 2) {
        $limit = 16384;
    } else {
        $limit = 256 * 1024 * 1024; # never dump bigger than 256 MB
    }
    $$self{Limit} = $limit;
    # pre-initialize open/closed hashes for all columns
    for ($i=0; $i<4; ++$i) {
        $self->{Open}->[$i] = { ID => [ ], Element => { } };
        $self->{Closed}->[$i] = { ID => [ ], Element => { } };
    }
    $bkgStart = $bkgEnd = 0;
    undef @bkgSpan;
    my $index = 0;  # initialize tooltip index
    my (@names, $wasUnused, @starts);
    # only do dump if we didn't have a serious error
    @starts = sort { $a <=> $b } keys %$block unless $$self{Error};
    for ($i=0; $i<=@starts; ++$i) {
        my $start = $starts[$i];
        my $parmList;
        if (defined $start) {
            $parmList = $$block{$start};
        } elsif ($bkgEnd and $pos < $bkgEnd and not defined $wasUnused) {
            $start = $bkgEnd;   # finish last bkg block
        } else {
            last;
        }
        my $len = $start - $pos;
        if ($len > 0 and not $wasUnused) {
            # we have a unused bytes before this data block
            --$i;   # dump the data block next time around
            # split unused data into 2 blocks if it spans end of a bkg block
            my ($nextBkgEnd, $bkg);
            if (not defined $wasUnused and $bkgEnd) {
                foreach $bkg (@bkgSpan) {
                    next if $pos >= $$bkg{End} + $dataPos or $pos + $len <= $$bkg{End} + $dataPos;
                    $nextBkgEnd = $$bkg{End} unless $nextBkgEnd and $nextBkgEnd < $$bkg{End};
                }
            }
            if ($nextBkgEnd) {
                $start = $pos;
                $len = $nextBkgEnd + $dataPos - $pos;
                $wasUnused = 0;
            } else {
                $start = $pos;  # dump the unused bytes now
                $wasUnused = 1; # avoid re-dumping unused bytes if we get a read error
            }
            my $str = ($len > 1) ? "unused $len bytes" : 'pad byte';
            $parmList = [ [ $len, "[$str]", undef, 0x108 ] ];
        } else {
            undef $wasUnused;
        }
        my $parms;
        foreach $parms (@$parmList) {
            my ($len, $msg, $tip, $flag, $tipNum) = @$parms;
            next unless $len > 0;
            $flag = 0 unless defined $flag;
            # generate same name for all blocks indexed by this tooltip
            my $name;
            $name = $names[$tipNum] if defined $tipNum;
            my $idx = $index;
            if ($name) {
                # get index from existing ID
                $idx = substr($name, 1);
            } else {
                $name = "t$index";
                $names[$tipNum] = $name if defined $tipNum;
                ++$index;
            }
            if ($flag & 0x14) {
                my %bkg = (
                    Class => $flag & 0x04 ? "$name M" : $name,
                    Start => $start - $dataPos,
                    End   => $start - $dataPos + $len,
                );
                push @bkgSpan, \%bkg;
                $bkgStart = $bkg{Start} unless $bkgStart and $bkgStart < $bkg{Start};
                $bkgEnd = $bkg{End} unless $bkgEnd and $bkgEnd > $bkg{End};
                push @{$self->{MSpanList}}, $name;
                next;
            }
            # loop until we read the value properly
            my ($end, $try);
            for ($try=0; $try<2; ++$try) {
                $end = $start + $len;
                # only load as much of the block as we are going to dump
                # (read 32 more bytes than necessary just in case there
                # is only one skipped line that we decide to print)
                my $size = ($len > $limit + 32) ? $limit / 2 + 16 : $len;
                if ($start >= $dataPos and $end <= $dataEnd) {
                    $buff = substr($$dataPt, $start-$dataPos, $size);
                    if ($len != $size) {
                        $buff .= substr($$dataPt, $start-$dataPos+$len-$size, $size);
                    }
                } else {
                    $buff = '';
                    if ($raf->Seek($start, 0) and $raf->Read($buff, $size) == $size) {
                        # read end of block
                        if ($len != $size) {
                            my $buf2 = '';
                            unless ($raf->Seek($start+$len-$size, 0) and
                                    $raf->Read($buf2, $size) == $size)
                            {
                                $err = $msg;
                                # reset $len to the actual length of available data
                                $raf->Seek(0, 2);
                                $len = $raf->Tell() - $start;
                                $tip .= "<br>Error: Only $len bytes available!" if $tip;
                                next;
                            }
                            $buff .= $buf2;
                            undef $buf2;
                        }
                    } else {
                        $err = $msg;
                        $len = length $buff;
                        $tip .= "<br>Error: Only $len bytes available!" if $tip;
                    }
                }
                last;
            }
            $tip and $self->{TipList}->[$idx] = $tip;
            next unless length $buff;
            # set flag to continue this line if next block is contiguous
            if ($i+1 < @starts and $parms eq $$parmList[-1] and
                ($end == $starts[$i+1] or ($end < $starts[$i+1] and $end >= $pos)))
            {
                my $nextFlag = $block->{$starts[$i+1]}->[0]->[3] || 0;
                $flag |= 0x100 unless $flag & 0x01 or $nextFlag & 0x01;
            }
            $self->DumpTable($start-$dataPos, \$buff, $msg, $name,
                             $flag, $len, $pos-$dataPos);
            undef $buff;
            $pos = $end if $pos < $end;
        }
    }
    $self->Open('','');     # close all open elements
    $raf->Seek($tell,0);

    # write output HTML file
    Write($outfile, $htmlHeader1, $title);
    if ($self->{Cols}->[0]) {
        Write($outfile, $htmlHeader2);
        my $mspan = \@{$$self{MSpanList}};
        for ($i=0; $i<@$mspan; ++$i) {
            Write($outfile, qq(mspan[$i] = "$$mspan[$i]";\n));
        }
        Write($outfile, $htmlHeader3, $self->{Cols}->[0]);
        Write($outfile, '</pre></td><td valign="top">',
                        $preMouse, $self->{Cols}->[1]);
        Write($outfile, '</pre></td><td class=c2 valign="top">',
                        $preMouse, $self->{Cols}->[2]);
        Write($outfile, '</pre></td><td valign="top">',
                        $preMouse, $self->{Cols}->[3]);
        Write($outfile, "</pre></td></tr></table>\n<div id=tb class=tb> </div>\n");
        my $tips = \@{$$self{TipList}};
        for ($i=0; $i<@$tips; ++$i) {
            my $tip = $$tips[$i];
            Write($outfile, "<div id=p$i class=tt>$tip</div>\n") if defined $tip;
        }
        delete $$self{TipList};
        $rtnVal = 1;
    } else {
        my $err = $$self{Error} || 'No EXIF or TIFF information found in image';
        Write($outfile, "$title</title></head><body>\n$err\n");
        $rtnVal = 0;
    }
    Write($outfile, "</body></html>\n");
    for ($i=0; $i<4; ++$i) {
        $self->{Cols}->[$i] = '';   # free memory
    }
    if ($err) {
        $err =~ tr/()//d;
        $$self{ERROR} = $err;
        return -1;
    }
    return $rtnVal;
}

#------------------------------------------------------------------------------
# Open or close a specified html element
# Inputs: 0) HtmlDump object ref, 1) element id, 2) element string,
#         3-N) list of column numbers (empty for all columns)
# - element id may be '' to close all elements
# - element string may be '' to close element by ID (or 0 to close without reopening)
# - element id and string may both be 1 to reopen temporarily closed elements
sub Open($$$;@)
{
    my ($self, $id, $element, @colNums) = @_;

    # loop through specified columns
    @colNums or @colNums = (0 .. $#{$self->{Open}});
    my $col;
    foreach $col (@colNums) {
        # get information about open elements in this column
        my $opHash = $self->{Open}->[$col];
        my $opElem = $$opHash{Element};
        if ($element) {
            # next if already open
            next if $$opElem{$id} and $$opElem{$id} eq $element;
        } elsif ($id and not $$opElem{$id}) {
            # next if already closed and nothing to reopen
            next unless $element eq '' and @{$self->{Closed}->[$col]->{ID}};
        }
        my $opID = $$opHash{ID};
        my $clHash = $self->{Closed}->[$col];
        my $clID = $$clHash{ID};
        my $clElem = $$clHash{Element};
        # get reference to output column list (use temp list if available)
        my $cols = $$self{TmpCols} || $$self{Cols};
        # close everything down to this element if necessary
        if ($$opElem{$id} or not $id) {
            while (@$opID) {
                my $tid = pop @$opID;
                my $e = $$opElem{$tid};
                $e =~ s/^<(\S+).*/<\/$1>/s;
                $$cols[$col] .= $e;
                if ($id eq $tid or not $id) {
                    delete $$opElem{$tid};
                    last if $id;
                    next;
                }
                # add this to the temporarily closed list
                # (because we really didn't want to close it)
                push @$clID, $tid;
                $$clElem{$tid} = $$opElem{$tid};
                delete $$opElem{$tid};
            }
            unless ($id) {
                # forget all temporarily closed elements
                $clID = $$clHash{ID} = [ ];
                $clElem = $$clHash{Element} = { };
            }
        } elsif ($$clElem{$id}) {
            # delete from the list of temporarily closed elements
            delete $$clElem{$id};
            @$clID = grep !/^$id$/, @$clID;
        }
        next if $element eq '0'; # 0 = don't reopen temporarily closed elements

        # re-open temporarily closed elements
        while (@$clID) {
            my $tid = pop @$clID;
            $$cols[$col] .= $$clElem{$tid};
            push @$opID, $tid;
            $$opElem{$tid} = $$clElem{$tid};
            delete $$clElem{$tid};
        }
        # open specified element
        if ($element and $element ne '1') {
            $$cols[$col] .= $element;
            push @$opID, $id;
            $$opElem{$id} = $element;
        }
    }
}

#------------------------------------------------------------------------------
# Dump a block of data in HTML table form
# Inputs: 0) HtmlDump object ref, 1) data position, 2) block pointer,
#         3) message, 4) object name, 5) flag, 6) full block length (actual
#         data may be shorter), 7) data end position
sub DumpTable($$$;$$$$$)
{
    my ($self, $pos, $blockPt, $msg, $name, $flag, $len, $endPos) = @_;
    $len = length $$blockPt unless defined $len;
    $endPos = 0 unless $endPos;
    my ($f0, $dblRef, $id);
    my $skipped = 0;
    if (($endPos and $pos < $endPos) or $flag & 0x02) {
        # display double-reference addresses in red
        $f0 = "<span class=V>";
        $dblRef = 1 if $endPos and $pos < $endPos;
    } else {
        $f0 = '';
    }
    my @c = ('','','','');
    $$self{TmpCols} = \@c;
    if ($name) {
        if ($msg and $msg =~ /^\[/) {
            $id = 'U';
        } else {
            if ($$self{A}) {
                $id = 'X';
                $$self{A} = 0;
            } else {
                $id = 'V';
                $$self{A} = 1;
            }
            ++$id unless $dblRef;
        }
        $name = "<a name=$name class=$id>";
        $msg and $msg = "$name$msg</a>";
    } else {
        $name = '';
    }
    # use base-relative offsets from now on
    my $cols = 0;
    my $p = $pos;
    if ($$self{Cont}) {
        $cols = $pos & 0x0f;
        $c[1] .= ($cols == 8) ? '  ' : ' ';
    } else {
        my $addr = $pos < 0 ? sprintf("-%.4x",-$pos) : sprintf("%5.4x",$pos);
        $self->Open('fgd', $f0, 0);
        $self->Open('fgd', '', 3);
        $c[0] .= "$addr";
        $p -= $pos & 0x0f unless $flag & 0x01;
        if ($p < $pos) {
            $self->Open('bkg', '', 1, 2); # don't underline white space
            $cols = $pos - $p;
            my $n = 3 * $cols;
            ++$n if $cols > 7;
            $c[1] .= ' ' x $n;
            $c[2] .= ' ' x $cols;
            $p = $pos;
        }
    }
    # loop through each column of hex numbers
    for (;;) {
        my (@spanClass, @spanCont, $spanClose, $bkg);
        if ($p >= $bkgStart and $p < $bkgEnd) {
            foreach $bkg (@bkgSpan) {
                next unless $p >= $$bkg{Start} and $p < $$bkg{End};
                push @spanClass, $$bkg{Class};
                if ($p + 1 == $$bkg{End}) {
                    $spanClose = 1;
                } else {
                    push @spanCont, $$bkg{Class};   # this span continues
                }
            }
            $self->Open('bkg', @spanClass ? "<span class='@spanClass'>" : '', 1, 2);
        } else {
            $self->Open('bkg', '', 1, 2);
        }
        $self->Open('a', $name, 1, 2);
        my $ch = substr($$blockPt,$p-$pos-$skipped,1);
        $c[1] .= sprintf("%.2x", ord($ch));
        # make the character HTML-friendly
        $ch =~ tr/\x00-\x1f\x7f-\xff/./;
        $ch =~ s/&/&amp;/g;
        $ch =~ s/>/&gt;/g;
        $ch =~ s/</&lt;/g;
        $c[2] .= $ch;
        ++$p;
        ++$cols;
        # close necessary elements
        if ($spanClose) {
            my $spanCont = @spanCont ? "<span class='@spanCont'>" : '';
            # close without reopening if closing anchor later
            my $arg = ($p - $pos >= $len) ? 0 : $spanCont;
            $self->Open('bkg', $arg, 1, 2);
        }
        if ($dblRef and $p >= $endPos) {
            $dblRef = 0;
            ++$id;
            $name =~ s/class=\w\b/class=$id/;
            $f0 = '';
            $self->Open('fgd', $f0, 0);
        }
        if ($p - $pos >= $len) {
            $self->Open('a', '', 1, 2);     # close our anchor
            last;
        }
        if ($cols < 16) {
            $c[1] .= ($cols == 8 ? '  ' : ' ');
            next;
        } elsif ($flag & 0x01 and $cols < $len) {
            $c[1] .= ' ';
            next;   # put it all on one line
        }
        unless ($$self{Msg}) {
            $c[3] .= $msg;
            $msg = '';
        }
        $_ .= "\n" foreach @c;  # add CR to all lines
        $$self{Msg} = 0;
        # limit data length if specified
        if ($$self{Limit}) {
            my $div = ($flag & 0x08) ? 4 : 1;
            my $lim = $$self{Limit} / (2 * $div) - 16;
            if ($p - $pos > $lim and $len - $p + $pos > $lim) {
                my $n = ($len - $p + $pos - $lim) & ~0x0f;
                if ($n > 16) { # (no use just cutting out one line)
                    $self->Open('bkg', '', 1, 2); # no underline
                    my $note = sprintf "[snip %d lines]", $n / 16;
                    $note = (' ' x (24-length($note)/2)) . $note;
                    $c[0] .= "  ...\n";
                    $c[1] .= $note . (' ' x (48-length($note))) . "\n";
                    $c[2] .= "     [snip]     \n";
                    $c[3] .= "\n";
                    $p += $n;
                    $skipped += $len - length $$blockPt;
                }
            }
        }
        $c[0] .= ($p < 0 ? sprintf("-%.4x",-$p) : sprintf("%5.4x",$p));
        $cols = 0;
    }
    if ($msg) {
        $msg = " $msg" if $$self{Msg};
        $c[3] .= $msg;
    }
    if ($flag & 0x100 and $cols < 16) {    # continue on same line?
        $$self{Cont} = 1;
        $$self{Msg} = 1 if $msg;
    } else {
        $_ .= "\n" foreach @c;
        $$self{Msg} = 0;
        $$self{Cont} = 0;
    }
    # add temporary column data to our real columns
    my $i;
    for ($i=0; $i<4; ++$i) {
        $self->{Cols}->[$i] .= $c[$i];
    }
    delete $$self{TmpCols};
}

#------------------------------------------------------------------------------
# Finish dumping of TIFF image data
# Inputs: 0) HtmlDump object ref, 1) ExifTool object ref, 2) length of file
# (this really belongs in Image::ExifTool::Exif, but is placed here so it
#  is only compiled when needed)
sub FinishTiffDump($$$)
{
    my ($self, $et, $size) = @_;
    my ($tag, $key, $start, $blockInfo, $i);

    # list of all indirectly referenced TIFF data tags
    my %offsetPair = (
        StripOffsets      => 'StripByteCounts',
        TileOffsets       => 'TileByteCounts',
        FreeOffsets       => 'FreeByteCounts',
        ThumbnailOffset   => 'ThumbnailLength',
        PreviewImageStart => 'PreviewImageLength',
        JpgFromRawStart   => 'JpgFromRawLength',
        OtherImageStart   => 'OtherImageLength',
        ImageOffset       => 'ImageByteCount',
        AlphaOffset       => 'AlphaByteCount',
        MPImageStart      => 'MPImageLength',
        IDCPreviewStart   => 'IDCPreviewLength',
    );

    # add TIFF data to html dump
    foreach $tag (keys %offsetPair) {
        my $info = $et->GetInfo($tag);
        next unless %$info;
        # Panasonic hack: StripOffsets is not valid for Panasonic RW2 files,
        # and StripRowBytes is not valid for some RAW images
        if ($tag eq 'StripOffsets' and $$et{TAG_INFO}{$tag}{PanasonicHack}) {
            # use RawDataOffset instead if available since it is valid in RW2
            my $info2 = $et->GetInfo('RawDataOffset');
            $info2 = $info unless %$info2;
            my @keys = keys %$info2;
            my $offset = $$info2{$keys[0]};
            my $raf = $$et{RAF};
            # ignore StripByteCounts and assume raw data runs to the end of file
            if (@keys == 1 and $offset =~ /^\d+$/ and $raf) {
                my $pos = $raf->Tell();
                $raf->Seek(0, 2);   # seek to end
                my $len = $raf->Tell() - $offset;
                $raf->Seek($pos, 0);
                if ($len > 0) {
                    $self->Add($offset, $len, "(Panasonic raw data)", "Size: $len bytes", 0x08);
                    next;
                }
            }
        }
        # loop through all offsets tags
        foreach $key (keys %$info) {
            my $name = Image::ExifTool::GetTagName($key);
            my $grp1 = $et->GetGroup($key, 1);
            my $info2 = $et->GetInfo($offsetPair{$tag}, { Group1 => $grp1 });
            my $key2 = $offsetPair{$tag};
            $key2 .= $1 if $key =~ /( .*)/; # use same instance number as $tag
            next unless $$info2{$key2};
            my $offsets = $$info{$key};
            my $byteCounts = $$info2{$key2};
            # ignore primary MPImage (this is the whole JPEG)
            next if $tag eq 'MPImageStart' and $offsets eq '0';
            # (long lists may be SCALAR references)
            my @offsets = split ' ', (ref $offsets ? $$offsets : $offsets);
            my @byteCounts = split ' ', (ref $byteCounts ? $$byteCounts : $byteCounts);
            my $num = scalar @offsets;
            my $li = 0;
            my $padBytes = 0;
            for ($i=0; @offsets and @byteCounts; ++$i) {
                my $offset = shift @offsets;
                my $byteCount = shift @byteCounts;
                my $end = $offset + $byteCount;
                if (@offsets and @byteCounts) {
                    # show data as contiguous if only normal pad bytes between blocks
                    if ($end & 0x01 and $end + 1 == $offsets[0]) {
                        $end += 1;
                        ++$padBytes;    # count them
                    }
                    if ($end == $offsets[0]) {
                        # combine these two blocks
                        $byteCounts[0] += $offsets[0] - $offset;
                        $offsets[0] = $offset;
                        next;
                    }
                }
                my $msg = $et->GetGroup($key, 1) . ':' . $tag;
                $msg =~ s/(Offsets?|Start)$/ /;
                if ($num > 1) {
                    $msg .= "$li-" if $li != $i;
                    $msg .= "$i ";
                    $li = $i + 1;
                }
                $msg .= "data";
                my $tip = "Size: $byteCount bytes";
                $tip .= ", incl. $padBytes pad bytes" if $padBytes;
                $self->Add($offset, $byteCount, "($msg)", $tip, 0x08);
            }
        }
    }
    # find offset of last dumped information, and dump any unknown trailer
    my $last = 0;
    my $block = $$self{Block};
    foreach $start (keys %$block) {
        foreach $blockInfo (@{$$block{$start}}) {
            my $end = $start + $$blockInfo[0];
            $last = $end if $last < $end;
        }
    }
    my $diff = $size - $last;
    if ($diff > 0 and ($last or $et->Options('Unknown'))) {
        if ($diff > 1 or $size & 0x01) {
            $self->Add($last, $diff, "[unknown data]", "Size: $diff bytes", 0x08);
        } else {
            $self->Add($last, $diff, "[trailing pad byte]", undef, 0x08);
        }
    }
}

#------------------------------------------------------------------------------
# utility routine to write to file or memory
# Inputs: 0) file or scalar reference, 1-N) list of stuff to write
# Returns: true on success
sub Write($@)
{
    my $outfile = shift;
    if (UNIVERSAL::isa($outfile,'GLOB')) {
        return print $outfile @_;
    } elsif (ref $outfile eq 'SCALAR') {
        $$outfile .= join('', @_);
        return 1;
    }
    return 0;
}

1;  # end

__END__

=head1 NAME

Image::ExifTool::HtmlDump - Dump information in hex to HTML page

=head1 SYNOPSIS

    use Image::ExifTool::HtmlDump;
    my $dump = new Image::ExifTool::HtmlDump;
    $dump->Add($start, $size, $comment);
    $dump->Print($dumpInfo, $raf, $dataPt, $dataPos, $outfile);

=head1 DESCRIPTION

This module contains code used to generate an HTML-based hex dump of
information for debugging purposes.  This is code is called when the
ExifTool 'HtmlDump' option is used.

Currently, only EXIF/TIFF and JPEG information is dumped.

=head1 BUGS

Due to a memory allocation bug in ActivePerl 5.8.x for Windows, this code
may run extremely slowly when processing large files with this version of
Perl.

An HTML 4 compliant browser is needed to properly display the generated HTML
page.

=head1 AUTHOR

Copyright 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)

This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=head1 SEE ALSO

L<Image::ExifTool(3pm)|Image::ExifTool>

=cut