Bug#514380: libpdf-api2-perl: corrupts certain PNMs when embedding them

[Jeff]

This patch fixes things for me, adapted from:

https://github.com/PhilterPaper/Perl-PDF-Builder/commit/0c38fe27a1641216bda30fecdb42af356035d23e
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diff --git a/lib/PDF/API2/Content.pm b/lib/PDF/API2/Content.pm
index b82cc36..756b735 100644
--- a/lib/PDF/API2/Content.pm
+++ b/lib/PDF/API2/Content.pm
@@ -1246,6 +1246,8 @@ sub shade {
 
 =item $content->image($image_object, $x, $y)
 
+=item $content->image($image_object)
+
     # Example
     my $image_object = $pdf->image_jpeg($my_image_file);
     $content->image($image_object, 100, 200);
@@ -1267,6 +1269,8 @@ sub image {
     my $self = shift;
     my $img = shift;
     my ($x,$y,$w,$h) = @_;
+    if (!defined $y) { $y = 0; }
+    if (!defined $x) { $x = 0; }
     if (defined $img->{Metadata}) {
         $self->metaStart('PPAM:PlacedImage',$img->{Metadata});
     }
@@ -1295,7 +1299,10 @@ sub image {
 
 =item $content->formimage($form_object, $x, $y)
 
+=item $content->formimage($form_object)
+
 Places an XObject on the page in the specified location.
+The C<$x,$y> default is C<[0,0]>.
 
 =cut
 
@@ -1303,6 +1310,8 @@ sub formimage {
     my $self = shift;
     my $img = shift;
     my ($x,$y,$s) = @_;
+    if (!defined $y) { $y = 0; }
+    if (!defined $x) { $x = 0; }
     $self->save;
     if (!defined $s) {
         $self->matrix(1,0,0,1,$x,$y);
diff --git a/lib/PDF/API2/Resource/XObject/Image/PNM.pm b/lib/PDF/API2/Resource/XObject/Image/PNM.pm
index a3b22e4..89e146f 100644
--- a/lib/PDF/API2/Resource/XObject/Image/PNM.pm
+++ b/lib/PDF/API2/Resource/XObject/Image/PNM.pm
@@ -145,6 +145,9 @@ sub read_pnm {
             }
         } else {
             read($inf,$self->{' stream'},$info->{width}*$info->{height});
+
+            # part of file was already read into $buf but not otherwise used
+            $self->{' stream'} = $buf . $self->{' stream'};
         }
         $cs='DeviceGray';
     } elsif($info->{type} == 6) {
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