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Adds -decompress-just-content

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John Whitington
2025-04-19 15:30:50 +01:00
parent 229d628dfa
commit 2063aefa4c
2 changed files with 44 additions and 10 deletions
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45
cpdfcommand.ml
View File

@ -583,7 +583,8 @@ type args =
mutable replace_stream_with : string;
mutable output_unit : Pdfunits.t;
mutable dot_leader : bool;
mutable preserve_actions : bool}
mutable preserve_actions : bool;
mutable decompress_just_content : bool}
let args =
{op = None;
@ -734,7 +735,8 @@ let args =
replace_stream_with = "";
output_unit = Pdfunits.PdfPoint;
dot_leader = false;
preserve_actions = false}
preserve_actions = false;
decompress_just_content = false}
(* Do not reset original_filename or cpdflin or was_encrypted or
was_decrypted_with_owner or recrypt or producer or creator or path_to_* or
@ -871,7 +873,8 @@ let reset_arguments () =
args.replace_stream_with <- "";
args.output_unit <- Pdfunits.PdfPoint;
args.dot_leader <- false;
args.preserve_actions <- false
args.preserve_actions <- false;
args.decompress_just_content <- false
(* Prefer a) the one given with -cpdflin b) a local cpdflin, c) otherwise assume
installed at a system place *)
@ -2278,6 +2281,9 @@ let specs =
("-decompress",
Arg.Unit (setop Decompress),
" Decompress");
("-decompress-just-content",
Arg.Unit (fun () -> args.decompress_just_content <- true),
" Decompress just content streams");
("-compress",
Arg.Unit (setop Compress),
" Compress streams, leaving metadata alone");
@ -3345,7 +3351,7 @@ let really_write_pdf ?(encryption = None) ?(is_decompress=false) mk_id pdf outna
Pdfwrite.pdf_to_file_options
~preserve_objstm:args.preserve_objstm
~generate_objstm:args.create_objstm
~compress_objstm:(not is_decompress)
~compress_objstm:(not is_decompress || args.decompress_just_content)
~recrypt:(Some best_password)
None mk_id pdf outname'
end
@ -3358,7 +3364,7 @@ let really_write_pdf ?(encryption = None) ?(is_decompress=false) mk_id pdf outna
Pdfwrite.pdf_to_file_options
~preserve_objstm:args.preserve_objstm
~generate_objstm:args.create_objstm
~compress_objstm:(not is_decompress)
~compress_objstm:(not is_decompress || args.decompress_just_content)
encryption mk_id pdf outname'
end
else
@ -4080,11 +4086,38 @@ let go () =
end
| Some Decompress ->
let pdf = get_single_pdf (Some Decompress) false in
let content_stream_object_numbers =
if args.decompress_just_content then
let t = Hashtbl.create 256 in
Pdf.objiter
(fun i obj ->
begin match Pdf.lookup_immediate "/Contents" obj with
| Some (Pdf.Indirect i) -> Hashtbl.replace t i ()
| Some (Pdf.Array a) -> iter (function Pdf.Indirect i -> Hashtbl.replace t i () | _ -> ()) a
| _ -> ()
end;
begin match Pdf.lookup_direct pdf "/Subtype" obj with
| Some (Pdf.Name "/Form") -> Hashtbl.replace t i ()
| _ -> ()
end)
pdf;
t
else
null_hash ()
in
begin if args.decompress_just_content then
iter
(fun (i, _) ->
try Pdfcodec.decode_pdfstream_until_unknown pdf (Pdf.Indirect i) with
e -> Pdfe.log (Printf.sprintf "Decode failure: %s. Carrying on...\n" (Printexc.to_string e)))
(list_of_hashtbl content_stream_object_numbers)
else
Pdf.iter_stream
(function stream ->
try Pdfcodec.decode_pdfstream_until_unknown pdf stream with
e -> Pdfe.log (Printf.sprintf "Decode failure: %s. Carrying on...\n" (Printexc.to_string e)); ())
pdf;
pdf
end;
write_pdf ~is_decompress:true false pdf
| Some Compress ->
let pdf = get_single_pdf (Some Compress) false in

1
cpdfmanual.tex
View File

@ -1,5 +1,6 @@
%Document negative widths in -thinlines
%Document CCITT and CCITTG4 in -process-images
%Document -decompress-just-content
%Add chapter on forms
%\DocumentMetadata{lang=en, pdfversion=2.0, pdfstandard=ua-2, pdfstandard=a-4f, testphase={phase-III, title, table, math, firstaid}}
\documentclass{book}