Add piece info to composition

Changes

@@ -1,9 +1,10 @@
 2.7.3 (to come)
 
 o New -center-to-fit centres pages on a given paper size
-o Allow bold, italic, colours for bookmarks
+o Allow bold, italic, colours for JSON bookmarks
 o Clean up @B implementation for -split-on-bookmarks
 o Add @b<n>@ for trimming bookmark text to given length
+o Add Piece Info to -composition[-json]
 
 2.7.2 (October 2024)
 

cpdfcomposition.ml

@@ -18,6 +18,23 @@ let find_composition_structure_info pdf marked =
       end
   | _ -> []
 
+let find_composition_piece_info pdf marked =
+  let l = ref [] in
+  Pdf.objiter
+    (fun i obj ->
+      match Pdf.lookup_direct pdf "/PieceInfo" obj with
+      | Some x ->
+          let objs = Pdf.objects_referenced [] [] pdf x in
+            iter
+              (fun i ->
+                 match Hashtbl.find marked i with
+                 | () -> ()
+                 | exception Not_found -> l := i::!l; Hashtbl.add marked i ())
+              objs
+      | None -> ())
+    pdf;
+    !l
+
 let find_composition_images pdf i obj marked =
   match Hashtbl.find marked i with () -> [] | exception Not_found -> 
   match Pdf.lookup_direct pdf "/Subtype" obj with
@@ -91,7 +108,8 @@ let find_composition pdf =
            fonts := find_composition_fonts pdf i obj marked @ !fonts)
       pdf;
     let structure_info = find_composition_structure_info pdf marked in
-    (!images, !fonts, !content_streams, structure_info)
+    let piece_info = find_composition_piece_info pdf marked in
+      (!images, !fonts, !content_streams, structure_info, piece_info)
 
 let size pdf i =
   String.length (Pdfwrite.string_of_pdf_including_data (Pdf.lookup_obj pdf i))
@@ -119,22 +137,24 @@ let compressed_xref_table_size pdf =
 
 let show_composition_json filesize pdf =
   let perc x = float_of_int x /. float_of_int filesize *. 100. in
-  let o_images, o_fonts, o_content_streams, o_structure_info = find_composition pdf in
-  let images, fonts, content_streams, structure_info, attached_files, xref_table =
+  let o_images, o_fonts, o_content_streams, o_structure_info, o_piece_info = find_composition pdf in
+  let images, fonts, content_streams, structure_info, attached_files, piece_info, xref_table =
       compressed_size pdf o_images,
       compressed_size pdf o_fonts,
       compressed_size pdf o_content_streams,
       compressed_size pdf o_structure_info,
       Cpdfattach.size_attached_files pdf,
+      compressed_size pdf o_piece_info,
       compressed_xref_table_size pdf
   in
-  let r = images + fonts + content_streams + structure_info + attached_files + xref_table in
+  let r = images + fonts + content_streams + structure_info + attached_files + xref_table + piece_info in
     `List [`List [`String "Images"; `Int images; `Float (perc images)];
            `List [`String "Fonts"; `Int fonts; `Float (perc fonts)];
            `List [`String "Content streams"; `Int content_streams; `Float (perc content_streams)];
            `List [`String "Structure Info"; `Int structure_info; `Float (perc structure_info)];
            `List [`String "Attached Files"; `Int attached_files; `Float (perc attached_files)];
            `List [`String "XRef Table"; `Int xref_table; `Float (perc xref_table)];
+           `List [`String "Piece Info"; `Int piece_info; `Float (perc piece_info)];
            `List [`String "Unclassified"; `Int (filesize - r); `Float (perc (filesize - r))]]
 
 let show_composition_json_blob filesize pdf =

cpdfmanual.tex

@@ -3600,6 +3600,7 @@ Content streams: 132767 bytes (42.85%)
 Structure Info: 0 bytes (0.00%)
 Attached Files: 0 bytes (0.00%)
 XRef Table: 21082 bytes (6.80%)
+Piece Info: 0 bytes (0.00%)
 Unclassified: 11229 bytes (3.62%)
 \end{verbatim}
 \end{framed}\pagestyle{empty}\thispagestyle{fancy}
@@ -3614,12 +3615,13 @@ Unclassified: 11229 bytes (3.62%)
   ("Structure Info", 0, 0.0),
   ("Attached Files", 0, 0.0),
   ("XRef Table", 21082, 6.8048378194306816),
+  ("Piece Info", 0, 0.0),
   ("Unclassified", 11229, 3.6244912187831857)
 ]
 \end{verbatim}
 \end{framed}\pagestyle{empty}\thispagestyle{fancy}
 
-\noindent Note that, due to small inaccuracies in the method, it is possible for the \texttt{Unclassified} number to be negative.
+\noindent Note that, due to small inaccuracies in the method, it is possible for the \texttt{Unclassified} numbers to be negative.
 
 \begin{cpdflib}
 \clearpage