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package PDF::Builder::Resource::XObject::Image::TIFF::File;
use strict;
use warnings;
our $VERSION = '3.026'; # VERSION
our $LAST_UPDATE = '3.026'; # manually update whenever code is changed
use IO::File;
=head1 NAME
PDF::Builder::Resource::XObject::Image::TIFF::File - support routines for TIFF image library
=head1 METHODS
=head2 new
PDF::Builder::Resource::XObject::Image::TIFF::File->new()
=over
Create a TIFF image object, I<not> using the Graphics::TIFF library.
Remember to use the Builder.pm method image_tiff.
=back
=cut
sub new {
my ($class, $file) = @_;
my $self = {};
bless ($self, $class);
if (ref($file)) {
$self->{'fh'} = $file;
seek($self->{'fh'}, 0, 0);
} else {
$self->{'fh'} = IO::File->new();
open($self->{'fh'}, '<', $file) or die "$!: $file";
}
binmode($self->{'fh'}, ':raw');
my $fh = $self->{'fh'};
$self->{'offset'} = 0;
$fh->seek($self->{'offset'}, 0);
# checking byte order of data
$fh->read($self->{'byteOrder'}, 2);
$self->{'byte'} = 'C';
$self->{'short'} = (($self->{'byteOrder'} eq 'MM')? 'n': 'v');
$self->{'long'} = (($self->{'byteOrder'} eq 'MM')? 'N': 'V');
$self->{'rational'} = (($self->{'byteOrder'} eq 'MM')? 'NN': 'VV');
# get/check version id
$fh->read($self->{'version'}, 2);
$self->{'version'} = unpack($self->{'short'}, $self->{'version'});
die "Wrong TIFF Id '" . $self->{'version'} . "' (should be 42)." if $self->{'version'} != 42;
# get the offset to the first tag directory.
$fh->read($self->{'ifdOffset'}, 4);
$self->{'ifdOffset'} = unpack($self->{'long'}, $self->{'ifdOffset'});
$self->readTags();
return $self;
}
sub readTag {
my $self = shift;
my $fh = $self->{'fh'};
my $buf;
$fh->read($buf, 12);
my $tag = unpack($self->{'short'}, substr($buf, 0, 2));
my $type = unpack($self->{'short'}, substr($buf, 2, 2));
my $count = unpack($self->{'long'}, substr($buf, 4, 4));
my $len = 0;
$len = ($type == 1? $count : # byte
$type == 2? $count : # char2
$type == 3? $count*2: # int16
$type == 4? $count*4: # int32
$type == 5? $count*8: # rational: 2 * int32
$count);
my $off = substr($buf, 8, 4);
if ($len > 4) {
$off = unpack($self->{'long'}, $off);
} else {
$off = ($type == 1? unpack($self->{'byte'}, $off):
$type == 2? unpack($self->{'long'}, $off):
$type == 3? unpack($self->{'short'}, $off):
$type == 4? unpack($self->{'long'}, $off):
unpack($self->{'short'}, $off) );
}
return ($tag, $type, $count, $len, $off);
}
sub close { ## no critic
my $self = shift;
return $self->{'fh'}->close();
}
sub readTags {
my $self = shift;
my $fh = $self->{'fh'};
$self->{'fillOrder'} = 1;
$self->{'ifd'} = $self->{'ifdOffset'};
while ($self->{'ifd'} > 0) {
$fh->seek($self->{'ifd'}, 0);
$fh->read($self->{'ifdNum'}, 2);
$self->{'ifdNum'} = unpack($self->{'short'}, $self->{'ifdNum'});
$self->{'bitsPerSample'} = 1;
foreach (1 .. $self->{'ifdNum'}) {
my ($valTag, $valType, $valCount, $valLen, $valOffset) = $self->readTag();
# print "tag=$valTag type=$valType count=$valCount len=$valLen off=$valOffset\n";
if ($valTag == 0) {
# no-op
} elsif ($valTag == 256) {
$self->{'imageWidth'} = $valOffset;
} elsif ($valTag == 257) {
$self->{'imageHeight'} = $valOffset;
} elsif ($valTag == 258) {
# bits per sample
if ($valCount > 1) {
my $here = $fh->tell();
my $val;
$fh->seek($valOffset, 0);
$fh->read($val, 2);
$self->{'bitsPerSample'} = unpack($self->{'short'}, $val);
$fh->seek($here, 0);
} else {
$self->{'bitsPerSample'} = $valOffset;
}
} elsif ($valTag == 259) {
# compression
$self->{'filter'} = $valOffset;
if ($valOffset == 1) {
delete $self->{'filter'};
} elsif ($valOffset == 3 || $valOffset == 4) {
$self->{'filter'} = 'CCITTFaxDecode';
$self->{'ccitt'} = $valOffset;
} elsif ($valOffset == 5) {
$self->{'filter'} = 'LZWDecode';
} elsif ($valOffset == 6 || $valOffset == 7) {
$self->{'filter'} = 'DCTDecode';
} elsif ($valOffset == 8 || $valOffset == 0x80b2) {
$self->{'filter'} = 'FlateDecode';
} elsif ($valOffset == 32773) {
$self->{'filter'} = 'RunLengthDecode';
} else {
die "unknown/unsupported TIFF compression method with id '" . $self->{'filter'} . "'.";
}
} elsif ($valTag == 262) {
# photometric interpretation
$self->{'colorSpace'} = $valOffset;
if ($valOffset == 0) {
$self->{'colorSpace'} = 'DeviceGray';
$self->{'whiteIsZero'} = 1;
} elsif ($valOffset == 1) {
$self->{'colorSpace'} = 'DeviceGray';
$self->{'blackIsZero'} = 1;
} elsif ($valOffset == 2) {
$self->{'colorSpace'} = 'DeviceRGB';
} elsif ($valOffset == 3) {
$self->{'colorSpace'} = 'Indexed';
# } elsif ($valOffset == 4) {
# $self->{'colorSpace'} = 'TransMask';
} elsif ($valOffset == 5) {
$self->{'colorSpace'} = 'DeviceCMYK';
} elsif ($valOffset == 6) {
$self->{'colorSpace'} = 'DeviceRGB';
} elsif ($valOffset == 8) {
$self->{'colorSpace'} = 'Lab';
} else {
die "unknown/unsupported TIFF photometric interpretation with id '" . $self->{'colorSpace'} . "'.";
}
} elsif ($valTag == 266) {
$self->{'fillOrder'} = $valOffset;
} elsif ($valTag == 270) {
# ImageDescription
my $here = $fh->tell();
$fh->seek($valOffset, 0);
$fh->read($self->{'imageDescription'}, $valLen);
$fh->seek($here, 0);
} elsif ($valTag == 282) {
# xRes
my $here = $fh->tell();
$fh->seek($valOffset, 0);
$fh->read($self->{'xRes'}, $valLen);
$fh->seek($here, 0);
$self->{'xRes'} = [unpack($self->{'rational'}, $self->{'xRes'})];
$self->{'xRes'} = ($self->{'xRes'}->[0] / $self->{'xRes'}->[1]);
} elsif ($valTag == 283) {
# yRes
my $here = $fh->tell();
$fh->seek($valOffset, 0);
$fh->read($self->{'yRes'}, $valLen);
$fh->seek($here, 0);
$self->{'yRes'} = [unpack($self->{'rational'}, $self->{'yRes'})];
$self->{'yRes'} = ($self->{'yRes'}->[0] / $self->{'yRes'}->[1]);
} elsif ($valTag == 296) {
# resolution Unit
$self->{'resUnit'} = $valOffset;
} elsif ($valTag == 273) {
# image data offset/strip offsets
if ($valCount == 1) {
$self->{'imageOffset'} = $valOffset;
} else {
my $here = $fh->tell();
my $val;
$fh->seek($valOffset, 0);
$fh->read($val, $valLen);
$fh->seek($here, 0);
$self->{'imageOffset'} = [unpack($self->{'long'} . '*', $val)];
}
} elsif ($valTag == 277) {
$self->{'samplesPerPixel'} = $valOffset;
} elsif ($valTag == 278) {
$self->{'RowsPerStrip'} = $valOffset;
} elsif ($valTag == 279) {
# image data length/strip lengths
if ($valCount == 1) {
$self->{'imageLength'} = $valOffset;
} else {
my $here = $fh->tell();
my $val;
$fh->seek($valOffset, 0);
$fh->read($val, $valLen);
$fh->seek($here, 0);
$self->{'imageLength'} = [unpack($self->{'long'} . '*', $val)];
}
} elsif ($valTag == 292) {
$self->{'g3Options'} = $valOffset;
} elsif ($valTag == 293) {
$self->{'g4Options'} = $valOffset;
} elsif ($valTag == 320) {
# color map
$self->{'colorMapOffset'} = $valOffset;
$self->{'colorMapSamples'} = $valCount;
$self->{'colorMapLength'} = $valCount*2; # shorts!
} elsif ($valTag == 317) {
$self->{'Predictor'} = $valOffset;
} elsif ($valTag == 0x800d) {
# imageID
my $here = $fh->tell();
$fh->seek($valOffset, 0);
$fh->read($self->{'imageId'}, $valLen);
$fh->seek($here, 0);
# } else {
# print "tag=$valTag, type=$valType, len=$valLen\n";
}
} # end foreach loop
$fh->read($self->{'ifd'}, 4);
$self->{'ifd'} = unpack($self->{'long'}, $self->{'ifd'});
} # end while loop
return $self;
}
1;
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