773 lines
29 KiB
Perl
773 lines
29 KiB
Perl
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#------------------------------------------------------------------------------
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# File: WritePDF.pl
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#
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# Description: Write PDF meta information
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#
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# Revisions: 12/08/2007 - P. Harvey Created
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#
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# References: 1) http://partners.adobe.com/public/developer/pdf/index_reference.html
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#
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# Notes: The special "PDF-update" group can be deleted to revert exiftool updates
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#------------------------------------------------------------------------------
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package Image::ExifTool::PDF;
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use strict;
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use vars qw($lastFetched);
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sub WriteObject($$);
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sub EncodeString($);
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sub CryptObject($);
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# comments to mark beginning and end of ExifTool incremental update
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my $beginComment = '%BeginExifToolUpdate';
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my $endComment = '%EndExifToolUpdate ';
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my $keyExt; # crypt key extension
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my $pdfVer; # version of PDF file we are currently writing
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# internal tags used in dictionary objects
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my %myDictTags = (
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_tags => 1, _stream => 1, _decrypted => 1, _needCrypt => 1,
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_filtered => 1, _entry_size => 1, _table => 1,
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);
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# map for directories that we can add
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my %pdfMap = (
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XMP => 'PDF',
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);
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#------------------------------------------------------------------------------
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# Validate raw PDF values for writing (string date integer real boolean name)
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# Inputs: 0) ExifTool object ref, 1) tagInfo hash ref, 2) raw value ref
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# Returns: error string or undef (and possibly changes value) on success
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sub CheckPDF($$$)
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{
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my ($et, $tagInfo, $valPtr) = @_;
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my $format = $$tagInfo{Writable} || $tagInfo->{Table}->{WRITABLE};
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if (not $format) {
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return 'No writable format';
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} elsif ($format eq 'string') {
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# (encode later because list-type string tags need to be encoded as a unit)
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} elsif ($format eq 'date') {
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# be flexible about this for now
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return 'Bad date format' unless $$valPtr =~ /^\d{4}/;
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} elsif ($format eq 'integer') {
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return 'Not an integer' unless Image::ExifTool::IsInt($$valPtr);
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} elsif ($format eq 'real') {
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return 'Not a real number' unless $$valPtr =~ /^[+-]?(?=\d|\.\d)\d*(\.\d*)?$/;
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} elsif ($format eq 'boolean') {
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$$valPtr = ($$valPtr and $$valPtr !~ /^f/i) ? 'true' : 'false';
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} elsif ($format eq 'name') {
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return 'Invalid PDF name' if $$valPtr =~ /\0/;
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} else {
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return "Invalid PDF format '${format}'";
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}
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return undef; # value is OK
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}
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#------------------------------------------------------------------------------
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# Format value for writing to PDF file
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# Inputs: 0) ExifTool ref, 1) value, 2) format string (string,date,integer,real,boolean,name)
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# Returns: formatted value or undef on error
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# Notes: Called at write time, so $pdfVer may be checked
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sub WritePDFValue($$$)
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{
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my ($et, $val, $format) = @_;
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if (not $format) {
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return undef;
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} elsif ($format eq 'string') {
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# encode as UCS2 if it contains any special characters
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$val = "\xfe\xff" . $et->Encode($val,'UCS2','MM') if $val =~ /[\x80-\xff]/;
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EncodeString(\$val);
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} elsif ($format eq 'date') {
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# convert date to "D:YYYYmmddHHMMSS+-HH'MM'" format
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$val =~ s/([-+]\d{2}):(\d{2})/${1}'${2}'/; # change timezone delimiters if necessary
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$val =~ tr/ ://d; # remove spaces and colons
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$val = "D:$val"; # add leading "D:"
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EncodeString(\$val);
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} elsif ($format =~ /^(integer|real|boolean)$/) {
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# no reformatting necessary
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} elsif ($format eq 'name') {
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return undef if $val =~ /\0/;
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if ($pdfVer >= 1.2) {
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$val =~ s/([\t\n\f\r ()<>[\]{}\/%#])/sprintf('#%.2x',ord $1)/sge;
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} else {
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return undef if $val =~ /[\t\n\f\r ()<>[\]{}\/%]/;
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}
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$val = "/$val"; # add leading '/'
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} else {
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return undef;
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}
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return $val;
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}
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#------------------------------------------------------------------------------
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# Encode PDF string
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# Inputs: 0) reference to PDF string
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# Returns: (updates string with encoded data)
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sub EncodeString($)
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{
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my $strPt = shift;
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if (ref $$strPt eq 'ARRAY') {
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my $str;
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foreach $str (@{$$strPt}) {
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EncodeString(\$str);
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}
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return;
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}
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Crypt($strPt, $keyExt, 1); # encrypt if necessary
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# encode as hex if we have any control characters (except tab)
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if ($$strPt=~/[\x00-\x08\x0a-\x1f\x7f\xff]/) {
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# encode as hex
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my $str='';
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my $len = length $$strPt;
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my $i = 0;
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for (;;) {
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my $n = $len - $i or last;
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$n = 40 if $n > 40; # break into reasonable-length lines
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$str .= $/ if $i;
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$str .= unpack('H*', substr($$strPt, $i, $n));
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$i += $n;
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}
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$$strPt = "<$str>";
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} else {
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$$strPt =~ s/([()\\])/\\$1/g; # must escape round brackets and backslashes
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$$strPt = "($$strPt)";
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}
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}
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#------------------------------------------------------------------------------
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# Encrypt an object
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# Inputs: 0) PDF object (encrypts in place)
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# Notes: Encrypts according to "_needCrypt" dictionary entry,
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# then deletes "_needCrypt" when done
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sub CryptObject($)
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{
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my $obj = $_[0];
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if (not ref $obj) {
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# only literal strings and hex strings are encrypted
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if ($obj =~ /^[(<]/) {
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undef $lastFetched; # (reset this just in case)
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my $val = ReadPDFValue($obj);
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EncodeString(\$val);
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$_[0] = $val;
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}
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} elsif (ref $obj eq 'HASH') {
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my $tag;
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my $needCrypt = $$obj{_needCrypt};
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foreach $tag (keys %$obj) {
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next if $myDictTags{$tag};
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# re-encrypt necessary objects only (others are still encrypted)
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# (this is really annoying, but is necessary because objects stored
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# in encrypted streams are decrypted when extracting, but strings stored
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# as direct objects are decrypted later since they must be decoded
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# before being decrypted)
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if ($needCrypt) {
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next unless defined $$needCrypt{$tag} ? $$needCrypt{$tag} : $$needCrypt{'*'};
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}
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CryptObject($$obj{$tag});
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}
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delete $$obj{_needCrypt}; # avoid re-re-crypting
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} elsif (ref $obj eq 'ARRAY') {
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my $val;
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foreach $val (@$obj) {
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CryptObject($val);
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}
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}
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}
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#------------------------------------------------------------------------------
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# Get free entries from xref stream dictionary that we wrote previously
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# Inputs: 0) xref dictionary reference
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# Returns: free entry hash (keys are object numbers, values are xref entry list refs)
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sub GetFreeEntries($)
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{
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my $dict = shift;
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my %xrefFree;
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# from the start we have only written xref stream entries in 'CNn' format,
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# so we can simplify things for now and only support this type of entry
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my $w = $$dict{W};
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if (ref $w eq 'ARRAY' and "@$w" eq '1 4 2') {
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my $size = $$dict{_entry_size}; # this will be 7 for 'CNn'
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my $index = $$dict{Index};
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my $len = length $$dict{_stream};
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# scan the table for free objects
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my $num = scalar(@$index) / 2;
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my $pos = 0;
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my ($i, $j);
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for ($i=0; $i<$num; ++$i) {
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my $start = $$index[$i*2];
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my $count = $$index[$i*2+1];
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for ($j=0; $j<$count; ++$j) {
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last if $pos + $size > $len;
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my @t = unpack("x$pos CNn", $$dict{_stream});
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# add entry if object was free
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$xrefFree{$start+$j} = [ $t[1], $t[2], 'f' ] if $t[0] == 0;
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$pos += $size; # step to next entry
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}
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}
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}
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return \%xrefFree;
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}
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#------------------------------------------------------------------------------
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# Write PDF object
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# Inputs: 0) output file or scalar ref, 1) PDF object
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# Returns: true on success
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# Notes: inserts white space before object, but none afterward
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sub WriteObject($$)
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{
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my ($outfile, $obj) = @_;
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if (ref $obj eq 'SCALAR') {
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Write($outfile, ' ', $$obj) or return 0;
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} elsif (ref $obj eq 'ARRAY') {
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# write array
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Write($outfile, @$obj > 10 ? $/ : ' ', '[') or return 0;
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my $item;
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foreach $item (@$obj) {
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WriteObject($outfile, $item) or return 0;
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}
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Write($outfile, ' ]') or return 0;
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} elsif (ref $obj eq 'HASH') {
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# write dictionary
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my $tag;
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Write($outfile, $/, '<<') or return 0;
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# prepare object as required if it has a stream
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if ($$obj{_stream}) {
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# encrypt stream if necessary (must be done before determining Length)
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CryptStream($obj, $keyExt) if $$obj{_decrypted};
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# write "Length" entry in dictionary
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$$obj{Length} = length $$obj{_stream};
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push @{$$obj{_tags}}, 'Length';
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# delete Filter-related entries since we don't yet write filtered streams
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delete $$obj{Filter};
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delete $$obj{DecodeParms};
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delete $$obj{DL};
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}
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# don't write my internal entries
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my %wrote = %myDictTags;
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# write tags in original order, adding new ones later alphabetically
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foreach $tag (@{$$obj{_tags}}, sort keys %$obj) {
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# ignore already-written or missing entries
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next if $wrote{$tag} or not defined $$obj{$tag};
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Write($outfile, $/, "/$tag") or return 0;
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WriteObject($outfile, $$obj{$tag}) or return 0;
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$wrote{$tag} = 1;
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}
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Write($outfile, $/, '>>') or return 0;
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if ($$obj{_stream}) {
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# write object stream
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# (a single 0x0d may not follow 'stream', so use 0x0d+0x0a here to be sure)
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Write($outfile, $/, "stream\x0d\x0a") or return 0;
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Write($outfile, $$obj{_stream}, $/, 'endstream') or return 0;
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}
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} else {
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# write string, number, name or object reference
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Write($outfile, ' ', $obj);
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}
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return 1;
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}
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#------------------------------------------------------------------------------
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# Write PDF File
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference
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# Returns: 1 on success, 0 if not valid PDF file, -1 on write error
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# Notes: dictionary structure: Main --+--> Info
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# +--> Root --> Metadata
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sub WritePDF($$)
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{
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my ($et, $dirInfo) = @_;
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my $raf = $$dirInfo{RAF};
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my $outfile = $$dirInfo{OutFile};
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my ($buff, %capture, %newXRef, %newObj, $objRef);
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my ($out, $id, $gen, $obj);
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# make sure this is a PDF file
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my $pos = $raf->Tell();
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$raf->Read($buff, 1024) >= 8 or return 0;
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$buff =~ /^(\s*)%PDF-(\d+\.\d+)/ or return 0;
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$$et{PDFBase} = length $1;
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$raf->Seek($pos, 0);
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# create a new ExifTool object and use it to read PDF and XMP information
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my $newTool = new Image::ExifTool;
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$newTool->Options(List => 1);
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$newTool->Options(Password => $et->Options('Password'));
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$$newTool{PDF_CAPTURE} = \%capture;
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my $info = $newTool->ImageInfo($raf, 'XMP', 'PDF:*', 'Error', 'Warning');
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# not a valid PDF file unless we got a version number
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# (note: can't just check $$info{PDFVersion} due to possibility of XMP-pdf:PDFVersion)
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my $vers = $newTool->GetInfo('PDF:PDFVersion');
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($pdfVer) = values %$vers;
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$pdfVer or $et->Error('Missing PDF:PDFVersion'), return 0;
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# check version number
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if ($pdfVer > 1.7) {
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if ($pdfVer >= 2.0) {
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$et->Error("Can't yet write PDF version $pdfVer"); # (future major version changes)
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return 1;
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}
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$et->Warn("ExifTool is untested with PDF version $pdfVer files", 1);
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}
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# fail if we had any serious errors while extracting information
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if ($capture{Error} or $$info{Error}) {
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$et->Error($capture{Error} || $$info{Error});
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return 1;
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}
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# make sure we have everything we need to rewrite this file
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foreach $obj (qw(Main Root xref)) {
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next if $capture{$obj};
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# any warning we received may give a clue about why this object is missing
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$et->Error($$info{Warning}) if $$info{Warning};
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$et->Error("Can't find $obj object");
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return 1;
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}
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$et->InitWriteDirs(\%pdfMap, 'XMP');
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# copy file up to start of previous exiftool update or end of file
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# (comment, startxref & EOF with 11-digit offsets and 2-byte newlines is 63 bytes)
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$raf->Seek(-64,2) and $raf->Read($buff,64) and $raf->Seek(0,0) or return -1;
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my $rtn = 1;
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my $prevUpdate;
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# (now $endComment is before "startxref", but pre-7.41 we wrote it after the EOF)
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if ($buff =~ /$endComment(\d+)\s+(startxref\s+\d+\s+%%EOF\s+)?$/s) {
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$prevUpdate = $1;
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# rewrite the file up to the original EOF
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Image::ExifTool::CopyBlock($raf, $outfile, $prevUpdate + $$et{PDFBase}) or $rtn = -1;
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# verify that we are now at the start of an ExifTool update
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unless ($raf->Read($buff, length $beginComment) and $buff eq $beginComment) {
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$et->Error('Previous ExifTool update is corrupted');
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return $rtn;
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}
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$raf->Seek($prevUpdate+$$et{PDFBase}, 0) or $rtn = -1;
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|
|
if ($$et{DEL_GROUP}{'PDF-update'}) {
|
||
|
|
$et->VPrint(0, " Reverted previous ExifTool updates\n");
|
||
|
|
++$$et{CHANGED};
|
||
|
|
return $rtn;
|
||
|
|
}
|
||
|
|
} elsif ($$et{DEL_GROUP}{'PDF-update'}) {
|
||
|
|
$et->Error('File contains no previous ExifTool update');
|
||
|
|
return $rtn;
|
||
|
|
} else {
|
||
|
|
# rewrite the whole file
|
||
|
|
while ($raf->Read($buff, 65536)) {
|
||
|
|
Write($outfile, $buff) or $rtn = -1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$out = $et->Options('TextOut') if $et->Options('Verbose');
|
||
|
|
#
|
||
|
|
# create our new PDF objects to write
|
||
|
|
#
|
||
|
|
my $xref = $capture{xref};
|
||
|
|
my $mainDict = $capture{Main};
|
||
|
|
my $metaRef = $capture{Root}->{Metadata};
|
||
|
|
my $nextObject;
|
||
|
|
|
||
|
|
# start by finding reference for info object in case it was deleted
|
||
|
|
# in a previous edit so we can re-use it here if adding PDF Info
|
||
|
|
my $prevInfoRef;
|
||
|
|
if ($prevUpdate) {
|
||
|
|
unless ($capture{Prev}) {
|
||
|
|
$et->Error("Can't locate trailer dictionary prior to last edit");
|
||
|
|
return $rtn;
|
||
|
|
}
|
||
|
|
$prevInfoRef = $capture{Prev}->{Info};
|
||
|
|
# start from previous size so the xref table doesn't continue
|
||
|
|
# to grow if we repeatedly add and delete the Metadata object
|
||
|
|
$nextObject = $capture{Prev}->{Size};
|
||
|
|
# don't re-use Meta reference if object was added in a previous update
|
||
|
|
undef $metaRef if $metaRef and $$metaRef=~/^(\d+)/ and $1 >= $nextObject;
|
||
|
|
} else {
|
||
|
|
$prevInfoRef = $$mainDict{Info};
|
||
|
|
$nextObject = $$mainDict{Size};
|
||
|
|
}
|
||
|
|
|
||
|
|
# delete entire PDF group if specified
|
||
|
|
my $infoChanged = 0;
|
||
|
|
if ($$et{DEL_GROUP}{PDF} and $capture{Info}) {
|
||
|
|
delete $capture{Info};
|
||
|
|
$info = { XMP => $$info{XMP} }; # remove extracted PDF tags
|
||
|
|
print $out " Deleting PDF Info dictionary\n" if $out;
|
||
|
|
++$infoChanged;
|
||
|
|
}
|
||
|
|
|
||
|
|
# create new Info dictionary if necessary
|
||
|
|
$capture{Info} = { _tags => [ ] } unless $capture{Info};
|
||
|
|
my $infoDict = $capture{Info};
|
||
|
|
|
||
|
|
# must pre-determine Info reference to be used in encryption
|
||
|
|
my $infoRef = $prevInfoRef || \ "$nextObject 0 R";
|
||
|
|
$keyExt = $$infoRef;
|
||
|
|
|
||
|
|
# must encrypt all values in dictionary if they came from an encrypted stream
|
||
|
|
CryptObject($infoDict) if $$infoDict{_needCrypt};
|
||
|
|
|
||
|
|
# must set line separator before calling WritePDFValue()
|
||
|
|
local $/ = $capture{newline};
|
||
|
|
|
||
|
|
# rewrite PDF Info tags
|
||
|
|
my $newTags = $et->GetNewTagInfoHash(\%Image::ExifTool::PDF::Info);
|
||
|
|
my $tagID;
|
||
|
|
foreach $tagID (sort keys %$newTags) {
|
||
|
|
my $tagInfo = $$newTags{$tagID};
|
||
|
|
my $nvHash = $et->GetNewValueHash($tagInfo);
|
||
|
|
my (@vals, $deleted);
|
||
|
|
my $tag = $$tagInfo{Name};
|
||
|
|
my $val = $$info{$tag};
|
||
|
|
my $tagKey = $tag;
|
||
|
|
unless (defined $val) {
|
||
|
|
# must check for tag key with copy number
|
||
|
|
($tagKey) = grep /^$tag/, keys %$info;
|
||
|
|
$val = $$info{$tagKey} if $tagKey;
|
||
|
|
}
|
||
|
|
if (defined $val) {
|
||
|
|
my @oldVals;
|
||
|
|
if (ref $val eq 'ARRAY') {
|
||
|
|
@oldVals = @$val;
|
||
|
|
$val = shift @oldVals;
|
||
|
|
}
|
||
|
|
for (;;) {
|
||
|
|
if ($et->IsOverwriting($nvHash, $val) > 0) {
|
||
|
|
$deleted = 1;
|
||
|
|
$et->VerboseValue("- PDF:$tag", $val);
|
||
|
|
++$infoChanged;
|
||
|
|
} else {
|
||
|
|
push @vals, $val;
|
||
|
|
}
|
||
|
|
last unless @oldVals;
|
||
|
|
$val = shift @oldVals;
|
||
|
|
}
|
||
|
|
# don't write this out if we deleted all values
|
||
|
|
delete $$infoDict{$tagID} unless @vals;
|
||
|
|
} elsif ($$nvHash{EditOnly}) {
|
||
|
|
next;
|
||
|
|
}
|
||
|
|
# decide whether we want to write this tag
|
||
|
|
# (native PDF information is always preferred, so don't check IsCreating)
|
||
|
|
next unless $deleted or $$tagInfo{List} or not exists $$infoDict{$tagID};
|
||
|
|
|
||
|
|
# add new values to existing ones
|
||
|
|
my @newVals = $et->GetNewValue($nvHash);
|
||
|
|
if (@newVals) {
|
||
|
|
push @vals, @newVals;
|
||
|
|
++$infoChanged;
|
||
|
|
if ($out) {
|
||
|
|
foreach $val (@newVals) {
|
||
|
|
$et->VerboseValue("+ PDF:$tag", $val);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
unless (@vals) {
|
||
|
|
# remove this entry from the Info dictionary if no values remain
|
||
|
|
delete $$infoDict{$tagID};
|
||
|
|
next;
|
||
|
|
}
|
||
|
|
# format value(s) for writing to PDF file
|
||
|
|
my $writable = $$tagInfo{Writable} || $Image::ExifTool::PDF::Info{WRITABLE};
|
||
|
|
if (not $$tagInfo{List}) {
|
||
|
|
$val = WritePDFValue($et, shift(@vals), $writable);
|
||
|
|
} elsif ($$tagInfo{List} eq 'array') {
|
||
|
|
foreach $val (@vals) {
|
||
|
|
$val = WritePDFValue($et, $val, $writable);
|
||
|
|
defined $val or undef(@vals), last;
|
||
|
|
}
|
||
|
|
$val = @vals ? \@vals : undef;
|
||
|
|
} else {
|
||
|
|
$val = WritePDFValue($et, join($et->Options('ListSep'), @vals), $writable);
|
||
|
|
}
|
||
|
|
if (defined $val) {
|
||
|
|
$$infoDict{$tagID} = $val;
|
||
|
|
++$infoChanged;
|
||
|
|
} else {
|
||
|
|
$et->Warn("Error converting $$tagInfo{Name} value");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($infoChanged) {
|
||
|
|
$$et{CHANGED} += $infoChanged;
|
||
|
|
} elsif ($prevUpdate) {
|
||
|
|
# must still write Info dictionary if it was previously updated
|
||
|
|
my $oldPos = LocateObject($xref, $$infoRef);
|
||
|
|
$infoChanged = 1 if $oldPos and $oldPos > $prevUpdate;
|
||
|
|
}
|
||
|
|
|
||
|
|
# create new Info dictionary if necessary
|
||
|
|
if ($infoChanged) {
|
||
|
|
# increment object count if we used a new object here
|
||
|
|
if (scalar(keys %{$capture{Info}}) > 1) {
|
||
|
|
$newObj{$$infoRef} = $capture{Info};# save to write later
|
||
|
|
$$mainDict{Info} = $infoRef; # add reference to trailer dictionary
|
||
|
|
++$nextObject unless $prevInfoRef;
|
||
|
|
} else {
|
||
|
|
# remove Info from Main (trailer) dictionary
|
||
|
|
delete $$mainDict{Info};
|
||
|
|
# write free entry in xref table if Info existed prior to all edits
|
||
|
|
$newObj{$$infoRef} = '' if $prevInfoRef;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
# rewrite XMP
|
||
|
|
my %xmpInfo = (
|
||
|
|
DataPt => $$info{XMP},
|
||
|
|
Parent => 'PDF',
|
||
|
|
);
|
||
|
|
my $xmpTable = Image::ExifTool::GetTagTable('Image::ExifTool::XMP::Main');
|
||
|
|
my $oldChanged = $$et{CHANGED};
|
||
|
|
my $newXMP = $et->WriteDirectory(\%xmpInfo, $xmpTable);
|
||
|
|
$newXMP = $$info{XMP} ? ${$$info{XMP}} : '' unless defined $newXMP;
|
||
|
|
|
||
|
|
# WriteDirectory() will increment CHANGED erroneously if non-existent
|
||
|
|
# XMP is deleted as a block -- so check for this
|
||
|
|
unless ($newXMP or $$info{XMP}) {
|
||
|
|
$$et{CHANGED} = $oldChanged;
|
||
|
|
$et->VPrint(0, " (XMP not changed -- still empty)\n");
|
||
|
|
}
|
||
|
|
my ($metaChanged, $rootChanged);
|
||
|
|
|
||
|
|
if ($$et{CHANGED} != $oldChanged and defined $newXMP) {
|
||
|
|
$metaChanged = 1;
|
||
|
|
} elsif ($prevUpdate and $capture{Root}->{Metadata}) {
|
||
|
|
# must still write Metadata dictionary if it was previously updated
|
||
|
|
my $oldPos = LocateObject($xref, ${$capture{Root}->{Metadata}});
|
||
|
|
$metaChanged = 1 if $oldPos and $oldPos > $prevUpdate;
|
||
|
|
}
|
||
|
|
if ($metaChanged) {
|
||
|
|
if ($newXMP) {
|
||
|
|
unless ($metaRef) {
|
||
|
|
# allocate new PDF object
|
||
|
|
$metaRef = \ "$nextObject 0 R";
|
||
|
|
++$nextObject;
|
||
|
|
$capture{Root}->{Metadata} = $metaRef;
|
||
|
|
$rootChanged = 1; # set flag to replace Root dictionary
|
||
|
|
}
|
||
|
|
# create the new metadata dictionary to write later
|
||
|
|
$newObj{$$metaRef} = {
|
||
|
|
Type => '/Metadata',
|
||
|
|
Subtype => '/XML',
|
||
|
|
# Length => length $newXMP, (set by WriteObject)
|
||
|
|
_tags => [ qw(Type Subtype) ],
|
||
|
|
_stream => $newXMP,
|
||
|
|
_decrypted => 1, # (this will be ignored if EncryptMetadata is false)
|
||
|
|
};
|
||
|
|
} elsif ($capture{Root}->{Metadata}) {
|
||
|
|
# free existing metadata object
|
||
|
|
$newObj{${$capture{Root}->{Metadata}}} = '';
|
||
|
|
delete $capture{Root}->{Metadata};
|
||
|
|
$rootChanged = 1; # set flag to replace Root dictionary
|
||
|
|
}
|
||
|
|
}
|
||
|
|
# add new Root dictionary if necessary
|
||
|
|
my $rootRef = $$mainDict{Root};
|
||
|
|
unless ($rootRef) {
|
||
|
|
$et->Error("Can't find Root dictionary");
|
||
|
|
return $rtn;
|
||
|
|
}
|
||
|
|
if (not $rootChanged and $prevUpdate) {
|
||
|
|
# must still write Root dictionary if it was previously updated
|
||
|
|
my $oldPos = LocateObject($xref, $$rootRef);
|
||
|
|
$rootChanged = 1 if $oldPos and $oldPos > $prevUpdate;
|
||
|
|
}
|
||
|
|
$newObj{$$rootRef} = $capture{Root} if $rootChanged;
|
||
|
|
#
|
||
|
|
# write incremental update if anything was changed
|
||
|
|
#
|
||
|
|
if ($$et{CHANGED}) {
|
||
|
|
# remember position of original EOF
|
||
|
|
my $oldEOF = Tell($outfile) - $$et{PDFBase};
|
||
|
|
Write($outfile, $beginComment) or $rtn = -1;
|
||
|
|
|
||
|
|
# write new objects
|
||
|
|
foreach $objRef (sort keys %newObj) {
|
||
|
|
$objRef =~ /^(\d+) (\d+)/ or $rtn = -1, last;
|
||
|
|
($id, $gen) = ($1, $2);
|
||
|
|
if (not $newObj{$objRef}) {
|
||
|
|
++$gen if $gen < 65535;
|
||
|
|
# write free entry in xref table
|
||
|
|
$newXRef{$id} = [ 0, $gen, 'f' ];
|
||
|
|
next;
|
||
|
|
}
|
||
|
|
# create new entry for xref table
|
||
|
|
$newXRef{$id} = [ Tell($outfile) - $$et{PDFBase} + length($/), $gen, 'n' ];
|
||
|
|
$keyExt = "$id $gen obj"; # (must set for stream encryption)
|
||
|
|
Write($outfile, $/, $keyExt) or $rtn = -1;
|
||
|
|
WriteObject($outfile, $newObj{$objRef}) or $rtn = -1;
|
||
|
|
Write($outfile, $/, 'endobj') or $rtn = -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
# Prev points to old xref table
|
||
|
|
$$mainDict{Prev} = $capture{startxref} unless $prevUpdate;
|
||
|
|
|
||
|
|
# add xref entry for head of free-object list
|
||
|
|
$newXRef{0} = [ 0, 65535, 'f' ];
|
||
|
|
|
||
|
|
# must insert free xref entries from previous exiftool update if applicable
|
||
|
|
if ($prevUpdate) {
|
||
|
|
my $mainFree;
|
||
|
|
# extract free entries from our previous Main xref stream
|
||
|
|
if ($$mainDict{Type} and $$mainDict{Type} eq '/XRef') {
|
||
|
|
$mainFree = GetFreeEntries($xref->{dicts}->[0]);
|
||
|
|
} else {
|
||
|
|
# free entries from Main xref table already captured for us
|
||
|
|
$mainFree = $capture{mainFree};
|
||
|
|
}
|
||
|
|
foreach $id (sort { $a <=> $b } keys %$mainFree) {
|
||
|
|
$newXRef{$id} = $$mainFree{$id} unless $newXRef{$id};
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
# connect linked list of free object in our xref table
|
||
|
|
my $prevFree = 0;
|
||
|
|
foreach $id (sort { $b <=> $a } keys %newXRef) { # (reverse sort)
|
||
|
|
next unless $newXRef{$id}->[2] eq 'f'; # skip if not free
|
||
|
|
# no need to add free entry for objects added by us
|
||
|
|
# in previous edits then freed again
|
||
|
|
if ($id >= $nextObject) {
|
||
|
|
delete $newXRef{$id}; # Note: deleting newXRef entry!
|
||
|
|
next;
|
||
|
|
}
|
||
|
|
$newXRef{$id}->[0] = $prevFree;
|
||
|
|
$prevFree = $id;
|
||
|
|
}
|
||
|
|
|
||
|
|
# prepare our main dictionary for writing
|
||
|
|
$$mainDict{Size} = $nextObject; # update number of objects
|
||
|
|
# must change the ID if it exists
|
||
|
|
if (ref $$mainDict{ID} eq 'ARRAY' and @{$$mainDict{ID}} > 1) {
|
||
|
|
# increment first byte since this is an easy change to make
|
||
|
|
$id = $mainDict->{ID}->[1];
|
||
|
|
if ($id =~ /^<([0-9a-f]{2})/i) {
|
||
|
|
my $byte = unpack('H2',chr((hex($1) + 1) & 0xff));
|
||
|
|
substr($id, 1, 2) = $byte;
|
||
|
|
} elsif ($id =~ /^\((.)/s and $1 ne '\\' and $1 ne ')' and $1 ne '(') {
|
||
|
|
my $ch = chr((ord($1) + 1) & 0xff);
|
||
|
|
# avoid generating characters that could cause problems
|
||
|
|
$ch = 'a' if $ch =~ /[()\\\x00-\x08\x0a-\x1f\x7f\xff]/;
|
||
|
|
substr($id, 1, 1) = $ch;
|
||
|
|
}
|
||
|
|
$mainDict->{ID}->[1] = $id;
|
||
|
|
}
|
||
|
|
|
||
|
|
# remember position of xref table in file (we will write this next)
|
||
|
|
my $startxref = Tell($outfile) - $$et{PDFBase} + length($/);
|
||
|
|
|
||
|
|
# must write xref as a stream in xref-stream-only files
|
||
|
|
if ($$mainDict{Type} and $$mainDict{Type} eq '/XRef') {
|
||
|
|
|
||
|
|
# create entry for the xref stream object itself
|
||
|
|
$newXRef{$nextObject++} = [ Tell($outfile) - $$et{PDFBase} + length($/), 0, 'n' ];
|
||
|
|
$$mainDict{Size} = $nextObject;
|
||
|
|
# create xref stream and Index entry
|
||
|
|
$$mainDict{W} = [ 1, 4, 2 ]; # int8u, int32u, int16u ('CNn')
|
||
|
|
$$mainDict{Index} = [ ];
|
||
|
|
$$mainDict{_stream} = '';
|
||
|
|
my @ids = sort { $a <=> $b } keys %newXRef;
|
||
|
|
while (@ids) {
|
||
|
|
my $startID = $ids[0];
|
||
|
|
for (;;) {
|
||
|
|
$id = shift @ids;
|
||
|
|
my ($pos, $gen, $type) = @{$newXRef{$id}};
|
||
|
|
if ($pos > 0xffffffff) {
|
||
|
|
$et->Error('Huge files not yet supported');
|
||
|
|
last;
|
||
|
|
}
|
||
|
|
$$mainDict{_stream} .= pack('CNn', $type eq 'f' ? 0 : 1, $pos, $gen);
|
||
|
|
last if not @ids or $ids[0] != $id + 1;
|
||
|
|
}
|
||
|
|
# add Index entries for this section of the xref stream
|
||
|
|
push @{$$mainDict{Index}}, $startID, $id - $startID + 1;
|
||
|
|
}
|
||
|
|
# write the xref stream object
|
||
|
|
$keyExt = "$id 0 obj"; # (set anyway, but xref stream should NOT be encrypted)
|
||
|
|
Write($outfile, $/, $keyExt) or $rtn = -1;
|
||
|
|
WriteObject($outfile, $mainDict) or $rtn = -1;
|
||
|
|
Write($outfile, $/, 'endobj') or $rtn = -1;
|
||
|
|
|
||
|
|
} else {
|
||
|
|
|
||
|
|
# write new xref table
|
||
|
|
Write($outfile, $/, 'xref', $/) or $rtn = -1;
|
||
|
|
# lines must be exactly 20 bytes, so pad newline if necessary
|
||
|
|
my $endl = (length($/) == 1 ? ' ' : '') . $/;
|
||
|
|
my @ids = sort { $a <=> $b } keys %newXRef;
|
||
|
|
while (@ids) {
|
||
|
|
my $startID = $ids[0];
|
||
|
|
$buff = '';
|
||
|
|
for (;;) {
|
||
|
|
$id = shift @ids;
|
||
|
|
$buff .= sprintf("%.10d %.5d %s%s", @{$newXRef{$id}}, $endl);
|
||
|
|
last if not @ids or $ids[0] != $id + 1;
|
||
|
|
}
|
||
|
|
# write this (contiguous-numbered object) section of the xref table
|
||
|
|
Write($outfile, $startID, ' ', $id - $startID + 1, $/, $buff) or $rtn = -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
# write main (trailer) dictionary
|
||
|
|
Write($outfile, 'trailer') or $rtn = -1;
|
||
|
|
WriteObject($outfile, $mainDict) or $rtn = -1;
|
||
|
|
}
|
||
|
|
# write trailing comment (marker to allow edits to be reverted)
|
||
|
|
Write($outfile, $/, $endComment, $oldEOF, $/) or $rtn = -1;
|
||
|
|
|
||
|
|
# write pointer to main xref table and EOF marker
|
||
|
|
Write($outfile, 'startxref', $/, $startxref, $/, '%%EOF', $/) or $rtn = -1;
|
||
|
|
|
||
|
|
} elsif ($prevUpdate) {
|
||
|
|
|
||
|
|
# nothing new changed, so copy over previous incremental update
|
||
|
|
$raf->Seek($prevUpdate+$$et{PDFBase}, 0) or $rtn = -1;
|
||
|
|
while ($raf->Read($buff, 65536)) {
|
||
|
|
Write($outfile, $buff) or $rtn = -1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($rtn > 0 and $$et{CHANGED} and ($$et{DEL_GROUP}{PDF} or $$et{DEL_GROUP}{XMP})) {
|
||
|
|
$et->Warn('ExifTool PDF edits are reversible. Deleted tags may be recovered!', 1);
|
||
|
|
}
|
||
|
|
undef $newTool;
|
||
|
|
undef %capture;
|
||
|
|
return $rtn;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
1; # end
|
||
|
|
|
||
|
|
__END__
|
||
|
|
|
||
|
|
=head1 NAME
|
||
|
|
|
||
|
|
Image::ExifTool::WritePDF.pl - Write PDF meta information
|
||
|
|
|
||
|
|
=head1 SYNOPSIS
|
||
|
|
|
||
|
|
These routines are autoloaded by Image::ExifTool::PDF.
|
||
|
|
|
||
|
|
=head1 DESCRIPTION
|
||
|
|
|
||
|
|
This file contains routines to write PDF metadata.
|
||
|
|
|
||
|
|
=head1 NOTES
|
||
|
|
|
||
|
|
When writing a PDF, exiftool does not modify the existing data. Instead,
|
||
|
|
the PDF file is appended with an incremental update which can easily be
|
||
|
|
removed to revert the file (by using ExifTool to delete the special
|
||
|
|
C<PDF-update> pseudo group).
|
||
|
|
|
||
|
|
=head1 AUTHOR
|
||
|
|
|
||
|
|
Copyright 2003-2018, 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 REFERENCES
|
||
|
|
|
||
|
|
=over 4
|
||
|
|
|
||
|
|
=item L<http://partners.adobe.com/public/developer/pdf/index_reference.html>
|
||
|
|
|
||
|
|
=back
|
||
|
|
|
||
|
|
=head1 SEE ALSO
|
||
|
|
|
||
|
|
L<Image::ExifTool::PDF(3pm)|Image::ExifTool::PDF>,
|
||
|
|
L<Image::ExifTool(3pm)|Image::ExifTool>
|
||
|
|
|
||
|
|
=cut
|