107 lines
4.2 KiB
OCaml
107 lines
4.2 KiB
OCaml
open Pdfutil
|
|
|
|
let size pdf i =
|
|
String.length (Pdfwrite.string_of_pdf_including_data (Pdf.lookup_obj pdf i))
|
|
|
|
(* FIXME Add soft masks *)
|
|
let find_composition_images pdf i obj marked =
|
|
match Hashtbl.find marked i with () -> 0 | exception Not_found ->
|
|
match Pdf.lookup_direct pdf "/Subtype" obj with
|
|
| Some (Pdf.Name "/Image") ->
|
|
Hashtbl.add marked i ();
|
|
String.length (Pdfwrite.string_of_pdf_including_data obj)
|
|
| _ -> 0
|
|
|
|
(* If it has /Font, find all objects referenced from it, and add
|
|
any not already marked to the count *)
|
|
let find_composition_fonts pdf i obj marked =
|
|
match Hashtbl.find marked i with () -> 0 | exception Not_found ->
|
|
let l = ref 0 in
|
|
match Pdf.lookup_direct pdf "/Type" obj with
|
|
| Some (Pdf.Name "/Font") ->
|
|
iter
|
|
(fun i ->
|
|
match Hashtbl.find marked i with
|
|
| () -> ()
|
|
| exception Not_found -> l += size pdf i; Hashtbl.add marked i ())
|
|
(Pdf.objects_referenced [] [] pdf (Pdf.Indirect i));
|
|
!l
|
|
| _ -> 0
|
|
|
|
(* FIXME: Add xobjects *)
|
|
let find_composition_content_streams pdf i obj marked =
|
|
match Hashtbl.find marked i with () -> 0 | exception Not_found ->
|
|
match Pdf.lookup_direct pdf "/Type" obj with
|
|
| Some (Pdf.Name "/Page") ->
|
|
let cs =
|
|
begin match Pdf.lookup_direct pdf "/Contents" obj with
|
|
| Some (Pdf.Indirect i) -> [i]
|
|
| Some (Pdf.Array is) -> option_map (function Pdf.Indirect i -> Some i | _ -> None) is
|
|
| _ -> []
|
|
end
|
|
in
|
|
let l = ref 0 in
|
|
iter
|
|
(fun i ->
|
|
match Hashtbl.find marked i with
|
|
| () -> ()
|
|
| exception Not_found -> Hashtbl.add marked i (); l += size pdf i)
|
|
cs;
|
|
!l
|
|
| _ -> 0
|
|
|
|
let find_composition_structure_info pdf i obj marked = 0
|
|
|
|
let find_composition_link_annotations pdf i obj marked = 0
|
|
|
|
let find_composition_embedded_files pdf i obj marked = 0
|
|
|
|
let find_composition pdf =
|
|
let marked = null_hash () in
|
|
let images = ref 0 in
|
|
let fonts = ref 0 in
|
|
let content_streams = ref 0 in
|
|
let structure_info = ref 0 in
|
|
let link_annotations = ref 0 in
|
|
let embedded_files = ref 0 in
|
|
Pdf.objiter
|
|
(fun i obj ->
|
|
match Hashtbl.find marked i with _ -> () | exception Not_found ->
|
|
embedded_files += find_composition_embedded_files pdf i obj marked;
|
|
images += find_composition_images pdf i obj marked;
|
|
content_streams += find_composition_content_streams pdf i obj marked;
|
|
structure_info += find_composition_structure_info pdf i obj marked;
|
|
link_annotations += find_composition_link_annotations pdf i obj marked;
|
|
fonts += find_composition_fonts pdf i obj marked)
|
|
|
|
pdf;
|
|
(!images, !fonts, !content_streams, !structure_info, !link_annotations, !embedded_files)
|
|
|
|
(* First go: images, fonts, content streams, structure info, link annotations, embedded files *)
|
|
let show_composition_json filesize pdf =
|
|
let perc x = float_of_int x /. float_of_int filesize *. 100. in
|
|
let images, fonts, content_streams, structure_info, link_annotations, embedded_files =
|
|
find_composition pdf
|
|
in
|
|
let r = images + fonts + content_streams + structure_info + link_annotations + embedded_files in
|
|
`List [`Tuple [`String "Images"; `Int images; `Float (perc images)];
|
|
`Tuple [`String "Fonts"; `Int fonts; `Float (perc fonts)];
|
|
`Tuple [`String "Content streams"; `Int content_streams; `Float (perc content_streams)];
|
|
`Tuple [`String "Structure Info"; `Int structure_info; `Float (perc structure_info)];
|
|
`Tuple [`String "Link Annotations"; `Int link_annotations; `Float (perc link_annotations)];
|
|
`Tuple [`String "Embedded Files"; `Int embedded_files; `Float (perc embedded_files)];
|
|
`Tuple [`String "Unclassified"; `Int (filesize - r); `Float (perc (filesize - r))]]
|
|
|
|
let show_composition filesize json pdf =
|
|
let module J = Cpdfyojson.Safe in
|
|
let j = show_composition_json filesize pdf in
|
|
if json then (flprint (J.pretty_to_string j); flprint "\n") else
|
|
match j with
|
|
| `List js ->
|
|
iter
|
|
(function
|
|
| `Tuple [`String a; `Int b; `Float c] -> Printf.printf "%s: %i bytes (%.2f%%)\n" a b c
|
|
| _ -> ())
|
|
js
|
|
| _ -> ()
|