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Expand font extraction to xobject fonts

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John Whitington 2024-11-21 14:47:44 +00:00
parent 1d2aab34f4
commit 3bb5019c46
1 changed files with 39 additions and 26 deletions
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65
cpdffont.ml
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@ -208,33 +208,46 @@ let print_font_table pdf fontname pagenumber =
done
| _ -> failwith "addtext: font not found for width"
let font_from_name pdf fontname pagenumber =
try
let resources = ref (select pagenumber (Pdfpage.pages_of_pagetree pdf)).Pdfpage.resources in
let chain = ref (tl (String.split_on_char '/' fontname)) in
let font = ref Pdf.Null in
while !chain <> [] do
match !chain with
| [f] ->
font := unopt (Pdf.lookup_chain pdf !resources ["/Font"; ("/" ^ f)]);
chain := []
| x::xs ->
resources := unopt (Pdf.lookup_chain pdf !resources ["/XObject"; "/" ^ x; "/Resources"]);
chain := xs
| [] -> ()
done;
!font
with
_ -> Pdfe.log (Printf.sprintf "Not found: font %s on page %i\n" fontname pagenumber); Pdf.Null
let extract_fontfile pagenumber fontname filename pdf =
let resources = (select pagenumber (Pdfpage.pages_of_pagetree pdf)).Pdfpage.resources in
match Pdf.lookup_direct pdf "/Font" resources with
| None -> failwith "extract_fontfile: font not found"
| Some fonts ->
let fontobj = Pdf.lookup_fail ("no font " ^ fontname) pdf fontname fonts in
let font = Pdftext.read_font pdf fontobj in
match font with
| Pdftext.CIDKeyedFont (_, {Pdftext.cid_fontdescriptor = {Pdftext.fontfile = Some fontfile}}, _)
| Pdftext.SimpleFont {Pdftext.fontdescriptor = Some {Pdftext.fontfile = Some fontfile}} ->
begin let objnum =
match fontfile with
| Pdftext.FontFile i | Pdftext.FontFile2 i | Pdftext.FontFile3 i -> i
in
match Pdf.lookup_obj pdf objnum with
| Pdf.Stream s as obj ->
Pdfcodec.decode_pdfstream pdf obj;
begin match s with
| {contents = (_, Pdf.Got bytes)} ->
let fh = open_out_bin filename in
for x = 0 to bytes_size bytes - 1 do output_byte fh (bget bytes x) done;
close_out fh
| _ -> failwith "extract_fontfile"
end
| _ -> failwith "extract_fontfile"
end
| _ -> failwith "unsupported or unfound font"
match Pdftext.read_font pdf (font_from_name pdf fontname pagenumber) with
| Pdftext.CIDKeyedFont (_, {Pdftext.cid_fontdescriptor = {Pdftext.fontfile = Some fontfile}}, _)
| Pdftext.SimpleFont {Pdftext.fontdescriptor = Some {Pdftext.fontfile = Some fontfile}} ->
begin let objnum =
match fontfile with
| Pdftext.FontFile i | Pdftext.FontFile2 i | Pdftext.FontFile3 i -> i
in
match Pdf.lookup_obj pdf objnum with
| Pdf.Stream s as obj ->
Pdfcodec.decode_pdfstream pdf obj;
begin match s with
| {contents = (_, Pdf.Got bytes)} ->
let fh = open_out_bin filename in
for x = 0 to bytes_size bytes - 1 do output_byte fh (bget bytes x) done;
close_out fh
| _ -> failwith "extract_fontfile"
end
| _ -> failwith "extract_fontfile"
end
| _ -> failwith "unsupported or unfound font"
(* Remove Embedded fonts. This is done by removing the Font Descriptor. *)
let remove_fontdescriptor pdf = function