81 lines
3.4 KiB
OCaml
81 lines
3.4 KiB
OCaml
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open Pdfutil
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let find_composition_images pdf i obj marked =
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match Pdf.lookup_direct pdf "/Subtype" obj with
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| Some (Pdf.Name "/Image") ->
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Hashtbl.add marked i ();
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String.length (Pdfwrite.string_of_pdf_including_data obj);
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| _ -> 0
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let find_composition_fonts pdf i obj marked = 0
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(* Also includes xobjects *)
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let find_composition_content_streams pdf i obj marked =
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match Pdf.lookup_direct pdf "/Type" obj with
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| Some (Pdf.Name "/Page") ->
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let cs =
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begin match Pdf.lookup_direct pdf "/Contents" obj with
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| Some (Pdf.Indirect i) -> [i]
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| Some (Pdf.Array is) -> option_map (function Pdf.Indirect i -> Some i | _ -> None) is
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| _ -> []
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end
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in
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let l = ref 0 in
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iter
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(fun i ->
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Hashtbl.add marked i ();
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l += String.length (Pdfwrite.string_of_pdf_including_data (Pdf.lookup_obj pdf i)))
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cs;
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!l
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| _ -> 0
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let find_composition_structure_info pdf i obj marked = 0
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let find_composition_link_annotations pdf i obj marked = 0
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let find_composition_embedded_files pdf i obj marked = 0
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let find_composition pdf =
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let marked = null_hash () in
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let images = ref 0 in
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let fonts = ref 0 in
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let content_streams = ref 0 in
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let structure_info = ref 0 in
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let link_annotations = ref 0 in
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let embedded_files = ref 0 in
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Pdf.objiter
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(fun i obj ->
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match Hashtbl.find marked i with _ -> () | exception Not_found ->
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images += find_composition_images pdf i obj marked;
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fonts += find_composition_fonts pdf i obj marked;
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content_streams += find_composition_content_streams pdf i obj marked;
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structure_info += find_composition_structure_info pdf i obj marked;
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link_annotations += find_composition_link_annotations pdf i obj marked;
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embedded_files += find_composition_embedded_files pdf i obj marked)
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pdf;
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(!images, !fonts, !content_streams, !structure_info, !link_annotations, !embedded_files)
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(* First go: images, fonts, content streams, structure info, link annotations, embedded files *)
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let show_composition_json filesize pdf =
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let perc x = float_of_int x /. float_of_int filesize *. 100. in
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let images, fonts, content_streams, structure_info, link_annotations, embedded_files =
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find_composition pdf
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in
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let r = images + fonts + content_streams + structure_info + link_annotations + embedded_files in
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`List [`Tuple [`String "Images"; `Int images; `Float (perc images)];
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`Tuple [`String "Fonts"; `Int fonts; `Float (perc fonts)];
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`Tuple [`String "Content streams"; `Int content_streams; `Float (perc content_streams)];
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`Tuple [`String "Structure Info"; `Int structure_info; `Float (perc structure_info)];
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`Tuple [`String "Link Annotations"; `Int link_annotations; `Float (perc link_annotations)];
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`Tuple [`String "Embedded Files"; `Int embedded_files; `Float (perc embedded_files)];
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`Tuple [`String "Unclassified"; `Int (filesize - r); `Float (perc (filesize - r))]]
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let show_composition filesize json pdf =
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let module J = Cpdfyojson.Safe in
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let j = show_composition_json filesize pdf in
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if json then (flprint (J.pretty_to_string j); flprint "\n") else
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match j with
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| `List js ->
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iter (function `Tuple [`String a; `Int b; `Float c] -> Printf.printf "%s: %i bytes (%.2f%%)\n" a b c | _ -> ()) js
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| _ -> ()
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