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|
#!/usr/bin/perl
use strict;
use warnings;
# VERSION
use PDF::API2::Basic::PDF::File;
my $file = shift(@ARGV);
unless ($file) {
print "Usage: $0 <file.pdf>\n\nDisplays information about a PDF file.\n";
exit;
}
my $pdf = PDF::API2::Basic::PDF::File->open($file) or die "Unable to open $file: $!";
my $command = shift(@ARGV);
unless ($command) {
print "PDF Version: " . $pdf->{' version'} . "\n";
print "XRef Table: " . $pdf->{' xref_position'} . "\n";
print "Info: " . _obj_reference($pdf->{'Info'}) . "\n" if $pdf->{'Info'};
print "Root: " . _obj_reference($pdf->{'Root'}) . "\n" if $pdf->{'Root'};
print "\n";
print "To view an object:\n";
print "$0 <file.pdf> obj <id> [generation]\n";
print "\n";
print "To view a cross-reference dictionary (with optional offset in bytes):\n";
print "$0 <file.pdf> xref [offset]\n";
print "\n";
}
elsif ($command eq 'xref') {
my $location = shift(@ARGV);
$location = $pdf->{' xref_position'} unless defined $location;
my $object = $pdf->readxrtr($location);
print "XRef at $location\n";
print '--------' . ('-' x length($location)) . "\n";
_print_obj($object);
}
elsif ($command eq 'obj') {
my $id = shift(@ARGV);
die "Missing required object number" unless $id and $id =~ /^[0-9]+$/;
my $generation = shift(@ARGV) || 0;
my $location = $pdf->locate_obj($id, $generation);
my $object = $pdf->read_objnum($id, $generation);
print "Object $id";
unless (ref($location)) {
print " (file position $location)\n";
}
else {
my ($obj_num, $obj_idx) = @$location;
print " (object stream $obj_num index $obj_idx)\n";
}
print '-------' . ('-' x length($id)) . "\n";
unless ($object) {
print "[Unable to read object]\n";
}
else {
_print_obj($object);
}
}
sub _print_obj {
my $object = shift();
if ($object->isa('PDF::API2::Basic::PDF::Dict')) {
print _obj_dictionary($object);
}
elsif ($object->isa('PDF::API2::Basic::PDF::Array')) {
print _obj_array($object) . "\n";
}
elsif ($object->isa('PDF::API2::Basic::PDF::Name') or
$object->isa('PDF::API2::Basic::PDF::Number') or
$object->isa('PDF::API2::Basic::PDF::String')) {
if ($object->val() =~ /^[[:print:]]+$/) {
print $object->val() . "\n";
}
else {
print $object->as_pdf() . "\n";
}
}
elsif ($object->isa('PDF::API2::Basic::PDF::Null')) {
print "<Null>\n"
}
else {
print "[" . ref($object) . "]\n";
}
if ($object->{' stream'}) {
print "\n";
print "Stream\n";
print "------\n";
eval { $object->read_stream(1) };
if ($@) {
print "[Stream could not be read or decoded]\n";
}
elsif ($ENV{'FORCE'} or $object->{' stream'} =~ /^[[:print:]\s]*$/) {
print $object->{' stream'} . "\n";
}
else {
print "[Stream contains non-printable characters. Set environment FORCE=1 to show the stream anyway.]\n";
}
}
}
sub _obj_reference {
my $object = shift();
return '<Object ' . $object->{' objnum'} . ($object->{' objgen'} ? ' ' . $object->{' objgen'} : '') . '>';
}
sub _obj_dictionary {
my $object = shift();
my $indent = shift() || 0;
my $data = {};
foreach my $key (keys %$object) {
next if $key =~ /^ /;
if (ref($object->{$key})) {
if ($object->{$key}->isa('PDF::API2::Basic::PDF::Array')) {
$data->{$key} = _obj_array($object->{$key}, $indent + 1);
chomp $data->{$key};
}
elsif ($object->{$key}->isa('PDF::API2::Basic::PDF::Dict')) {
if ($object->{$key}->{' objnum'}) {
$data->{$key} = '<Object ' . $object->{$key}->{' objnum'} . ($object->{$key}->{' objgen'} ? ' ' . $object->{$key}->{' objgen'} : '') . '>';
}
else {
unless (scalar grep { $_ !~ /^ / } keys %{$object->{$key}}) {
$data->{$key} = '<Empty Dictionary>';
}
else {
$data->{$key} = "\n" . _obj_dictionary($object->{$key}, $indent + 1);
chomp $data->{$key};
}
}
}
elsif ($object->{$key}->isa('PDF::API2::Basic::PDF::Name') or
$object->{$key}->isa('PDF::API2::Basic::PDF::Number') or
$object->{$key}->isa('PDF::API2::Basic::PDF::String')) {
if ($object->{$key}->val() =~ /^[[:print:]]+$/) {
$data->{$key} = $object->{$key}->val();
}
else {
$data->{$key} = $object->{$key}->as_pdf();
}
}
elsif ($object->{$key}->isa('PDF::API2::Basic::PDF::Null')) {
$data->{$key} = '<Null>';
}
elsif ($object->{$key}->isa('PDF::API2::Basic::PDF::Objind') and $object->{$key}->{' objnum'}) {
$data->{$key} = '<Object ' . $object->{$key}->{' objnum'} . ($object->{$key}->{' objgen'} ? ' ' . $object->{$key}->{' objgen'} : '') . '>';
}
else {
$data->{$key} = '[' . ref($object->{$key}) . ']';
}
}
else {
$data->{$key} = $object->{$key};
}
}
my $longest_key = 0;
foreach my $key (keys %$data) {
next if $data->{$key} =~ /^\n/;
$longest_key = length($key) if length($key) > $longest_key;
}
$longest_key++;
my $value = '';
my $cr = sub { return 1 if substr($data->{$_[0]}, 0, 1) eq "\n"; return -1; };
foreach my $key (sort { &$cr($a) <=> &$cr($b) or $a cmp $b } keys %$data) {
if ($indent) {
$value .= ' ' x ($indent * 4);
}
$value .= sprintf("%-${longest_key}s ", $key . ':') . $data->{$key} . "\n";
}
return $value;
}
sub _obj_array {
my $object = shift();
my $indent = shift() || 0;
return '[ ]' unless scalar $object->elements();
my @elements;
my $is_complex = 0;
foreach my $element ($object->elements()) {
unless (ref($element)) {
push @elements, $element;
}
else {
if ($element->isa('PDF::API2::Basic::PDF::Array')) {
push @elements, _obj_array($element, $indent + 1);
}
elsif ($element->isa('PDF::API2::Basic::PDF::Dict')) {
if ($element->{' objnum'}) {
push @elements, '<Object ' . $element->{' objnum'} . ($element->{' objgen'} ? ' ' . $element->{' objgen'} : '') . '>';
}
else {
unless (scalar grep { $_ !~ /^ / } keys %$element) {
push @elements, "<Empty Dictionary>";
}
else {
$is_complex = 1;
push @elements, "Dictionary: \n" . _obj_dictionary($element, $indent + 1);
chomp $elements[-1];
}
}
}
elsif ($element->isa('PDF::API2::Basic::PDF::Name') or
$element->isa('PDF::API2::Basic::PDF::Number') or
$element->isa('PDF::API2::Basic::PDF::String')) {
if ($element->val() =~ /^[[:print:]]+$/) {
push @elements, $element->val();
}
else {
push @elements, $element->as_pdf();
}
}
elsif ($element->isa('PDF::API2::Basic::PDF::Null')) {
push @elements, '<Null>';
}
elsif ($element->isa('PDF::API2::Basic::PDF::Objind') and $element->{' objnum'}) {
push @elements, '<Object ' . $element->{' objnum'} . ($element->{' objgen'} ? ' ' . $element->{' objgen'} : '') . '>';
}
else {
push @elements, '[' . ref($element) . ']';
}
}
}
my $value;
unless ($is_complex) {
$value = '[ ' . join(' ', @elements) . ' ]';
}
else {
$value = "\n";
foreach my $element (@elements) {
$value .= ' ' x ($indent * 4) if $indent;
$value .= '- ' . $element . "\n";
}
}
return $value;
}
|
