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cpdf-source
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Stream restoration after errors

This commit is contained in:
John Whitington 2024-01-03 17:43:51 +00:00
parent 50ada2d74f
commit ecb3193c3a
1 changed files with 11 additions and 13 deletions
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24
cpdfimage.ml
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@ -510,7 +510,7 @@ let jpeg_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~q
let command =
(Filename.quote_command path_to_convert [out; "-quality"; string_of_int q ^ "%"; out2])
in
(*0Printf.printf "%S\n" command;*) Sys.command command
(*Printf.printf "%S\n" command;*) Sys.command command
in
if retcode = 0 then
begin
@ -528,9 +528,7 @@ let jpeg_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~q
end
end
else
begin
Printf.printf "external process failed\n%!"
end;
begin Printf.printf "external process failed\n%!" end;
remove out;
remove out2
@ -551,6 +549,8 @@ let suitable_num pdf dict =
| _ -> 0
let lossless_out pdf ~pixel_threshold ~length_threshold extension s dict reference =
let old = !reference in
let restore () = reference := old in
let bpc = Pdf.lookup_direct pdf "/BitsPerComponent" dict in
let components = suitable_num pdf dict in
match components, bpc with
@ -562,7 +562,7 @@ let lossless_out pdf ~pixel_threshold ~length_threshold extension s dict referen
if size < length_threshold then (if !debug_image_processing then Printf.printf "length threshold not met\n%!"; None) else
begin
Pdfcodec.decode_pdfstream_until_unknown pdf s;
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with Some _ -> None | None ->
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with Some _ -> restore (); None | None ->
let out = Filename.temp_file "cpdf" "convertin" ^ (if suitable_num pdf dict < 4 then ".pnm" else ".cmyk") in
let out2 = Filename.temp_file "cpdf" "convertout" ^ extension in
let fh = open_out_bin out in
@ -582,6 +582,7 @@ let lossless_out pdf ~pixel_threshold ~length_threshold extension s dict referen
print_string (Pdfwrite.string_of_pdf dict);
print_string (Printf.sprintf "%s (%s) [%s]\n" colspace bpc filter);
if !debug_image_processing then Printf.printf "colourspace not suitable\n%!";
restore ();
None (* an image we cannot or do not handle *)
let lossless_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshold ~qlossless ~path_to_convert s dict reference =
@ -620,13 +621,6 @@ let lossless_to_jpeg pdf ~pixel_threshold ~length_threshold ~percentage_threshol
remove out;
remove out2
let combine_dicts o n =
let x =
fold_right (fun (k, v) d -> add k v d) o n
in
Printf.printf "%s\n" (Pdfwrite.string_of_pdf (Pdf.Dictionary x));
x
let lossless_resample pdf ~pixel_threshold ~length_threshold ~factor ~interpolate ~path_to_convert s dict reference =
match lossless_out pdf ~pixel_threshold ~length_threshold ".png" s dict reference with
| None -> ()
@ -669,6 +663,8 @@ let lossless_resample pdf ~pixel_threshold ~length_threshold ~factor ~interpolat
with _ -> () (* FIXME Remove *)
let recompress_1bpp_jbig2_lossless ~pixel_threshold ~length_threshold ~path_to_jbig2enc pdf s dict reference =
let old = !reference in
let restore () = reference := old in
let w = match Pdf.lookup_direct pdf "/Width" dict with Some (Pdf.Integer i) -> i | _ -> error "bad width" in
let h = match Pdf.lookup_direct pdf "/Height" dict with Some (Pdf.Integer i) -> i | _ -> error "bad height" in
if w * h < pixel_threshold then (if !debug_image_processing then Printf.printf "pixel threshold not met\n%!") else (* (but also, jbig2enc fails on tiny images) *)
@ -677,7 +673,9 @@ let recompress_1bpp_jbig2_lossless ~pixel_threshold ~length_threshold ~path_to_j
begin
Pdfcodec.decode_pdfstream_until_unknown pdf s;
match Pdf.lookup_direct pdf "/Filter" (fst !reference) with
| Some x -> if !debug_image_processing then Printf.printf "could not decode - skipping %s length %i\n%!" (Pdfwrite.string_of_pdf x) size
| Some x ->
if !debug_image_processing then Printf.printf "could not decode - skipping %s length %i\n%!" (Pdfwrite.string_of_pdf x) size;
restore ()
| None ->
let out = Filename.temp_file "cpdf" "convertin" ^ ".pnm" in
let out2 = Filename.temp_file "cpdf" "convertout" ^ ".jbig2" in