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Form xobject JSON parsing

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John Whitington
2020-02-04 16:50:04 +00:00
parent c5dd9f3c2a
commit 36ad2c6eb1
2 changed files with 22 additions and 12 deletions
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1
cpdfmanual.tex
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@@ -1,3 +1,4 @@
%Document \n in bookmark files
\documentclass{book}
\usepackage{palatino}
\usepackage{microtype}

33
cpdfwriteJSON.ml
View File

@@ -7,14 +7,14 @@ let soi = string_of_int
let string_of_float _ = failwith "use sof"
let string_of_int _ = failwith "use soi"
let rec json_of_object fcs no_stream_data = function
let rec json_of_object pdf fcs no_stream_data = function
| P.Null -> J.String "null"
| P.Boolean b -> J.Bool b
| P.Integer i -> J.Number (soi i)
| P.Real r -> J.Number (sof r)
| P.String s -> J.String s
| P.Name n -> J.String n
| P.Array objs -> J.Array (List.map (json_of_object fcs no_stream_data) objs)
| P.Array objs -> J.Array (List.map (json_of_object pdf fcs no_stream_data) objs)
| P.Dictionary elts ->
List.iter
(function
@@ -22,18 +22,27 @@ let rec json_of_object fcs no_stream_data = function
| ("/Contents", P.Array elts) -> List.iter (function P.Indirect i -> fcs i | _ -> ()) elts
| _ -> ())
elts;
J.Object (List.map (fun (k, v) -> (k, json_of_object fcs no_stream_data v)) elts)
J.Object (List.map (fun (k, v) -> (k, json_of_object pdf fcs no_stream_data v)) elts)
| P.Stream {contents = (Pdf.Dictionary dict, stream)} as thestream ->
Pdf.getstream thestream;
let str =
if no_stream_data then "<<stream data elided>>" else
match stream with Pdf.Got b -> Pdfio.string_of_bytes b | Pdf.ToGet _ -> "failure: toget"
in
json_of_object fcs no_stream_data (P.Array [P.Dictionary dict; P.String str])
json_of_object pdf fcs no_stream_data (P.Array [P.Dictionary dict; P.String str])
| P.Stream _ -> J.String "error: stream with not-a-dictioary"
| P.Indirect i -> J.Number (soi i)
| P.Indirect i ->
begin match Pdf.lookup_obj pdf i with
| P.Stream {contents = (Pdf.Dictionary dict as d, _)} ->
begin match Pdf.lookup_direct pdf "/Subtype" d with
| Some (Pdf.Name "/Form") -> fcs i
| _ -> ()
end
| _ -> ()
end;
J.Number (soi i)
let json_of_op no_stream_data = function
let json_of_op pdf no_stream_data = function
| O.Op_S -> J.Array [J.String "S"]
| O.Op_s -> J.Array [J.String "s"]
| O.Op_f -> J.Array [J.String "f"]
@@ -114,7 +123,7 @@ let json_of_op no_stream_data = function
J.Number (sof t.Pdftransform.f);
J.String "Tm"]
| O.Op_Tj s -> J.Array [J.String s; J.String "Tj"]
| O.Op_TJ pdfobject -> J.Array [json_of_object (fun _ -> ()) no_stream_data pdfobject; J.String "TJ"]
| O.Op_TJ pdfobject -> J.Array [json_of_object pdf (fun _ -> ()) no_stream_data pdfobject; J.String "TJ"]
| O.Op_' s -> J.Array [J.String s; J.String "'"]
| O.Op_'' (k, k', s) -> J.Array [J.Number (sof k); J.Number (sof k'); J.String s; J.String "''"]
| O.Op_d0 (k, k') -> J.Array [J.Number (sof k); J.Number (sof k'); J.String "d0"]
@@ -139,8 +148,8 @@ let json_of_op no_stream_data = function
J.Array (List.map (fun x -> J.Number (sof x)) fs @ [J.String s; J.String "SCNName"])
| O.Op_scnName (s, fs) ->
J.Array (List.map (fun x -> J.Number (sof x)) fs @ [J.String s; J.String "scnName"])
| O.InlineImage (dict, data) -> J.Array [json_of_object (fun _ -> ()) no_stream_data dict; J.String (Pdfio.string_of_bytes data)]
| O.Op_DP (s, obj) -> J.Array [J.String s; json_of_object (fun _ -> ()) no_stream_data obj; J.String "DP"]
| O.InlineImage (dict, data) -> J.Array [json_of_object pdf (fun _ -> ()) no_stream_data dict; J.String (Pdfio.string_of_bytes data)]
| O.Op_DP (s, obj) -> J.Array [J.String s; json_of_object pdf (fun _ -> ()) no_stream_data obj; J.String "DP"]
(* parse_stream needs pdf and resources. These are for lexing of inline images,
* looking up the colourspace. We do not need to worry about inherited
@@ -148,17 +157,17 @@ let json_of_op no_stream_data = function
* PDF standard. *)
let parse_content_stream pdf resources bs =
let ops = Pdfops.parse_stream pdf resources [bs] in
J.Array (List.map (json_of_op false) ops)
J.Array (List.map (json_of_op pdf false) ops)
let json_of_pdf parse_content no_stream_data pdf =
let trailerdict = (0, json_of_object (fun x -> ()) no_stream_data pdf.Pdf.trailerdict) in
let trailerdict = (0, json_of_object pdf (fun x -> ()) no_stream_data pdf.Pdf.trailerdict) in
let content_streams = ref [] in
let fcs n = content_streams := n::!content_streams in
let pairs =
let ps = ref [] in
Pdf.objiter
(fun i pdfobj ->
ps := (i, json_of_object fcs no_stream_data pdfobj)::!ps)
ps := (i, json_of_object pdf fcs no_stream_data pdfobj)::!ps)
pdf;
trailerdict::!ps
in