420 lines
19 KiB
OCaml
420 lines
19 KiB
OCaml
open Pdfutil
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open Cpdferror
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module J = Tjjson
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module P = Pdf
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module O = Pdfops
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let sof = Printf.sprintf "%f" (* To prevent "0." *)
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let soi = string_of_int
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let string_of_float _ = error "use sof"
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let string_of_int _ = error "use soi"
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let opf = function
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| J.Object ["F", J.Number f] -> float_of_string f
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| _ -> error "num: not a float"
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let opi = function
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| J.Object ["I", J.Number i] -> int_of_string i
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| _ -> error "num: not a float"
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let rec op_of_json = function
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| J.Array [J.String "S"] -> O.Op_S
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| J.Array [J.String "s"] -> O.Op_s
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| J.Array [J.String "f"] -> O.Op_f
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| J.Array [J.String "F"] -> O.Op_F
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| J.Array [J.String "f*"] -> O.Op_f'
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| J.Array [J.String "B"] -> O.Op_B
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| J.Array [J.String "B*"] -> O.Op_B'
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| J.Array [J.String "b"] -> O.Op_b
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| J.Array [J.String "b*"] -> O.Op_b'
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| J.Array [J.String "n"] -> O.Op_n
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| J.Array [J.String "W"] -> O.Op_W
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| J.Array [J.String "W*"] -> O.Op_W'
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| J.Array [J.String "BT"] -> O.Op_BT
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| J.Array [J.String "ET"] -> O.Op_ET
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| J.Array [J.String "q"] -> O.Op_q
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| J.Array [J.String "Q"] -> O.Op_Q
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| J.Array [J.String "h"] -> O.Op_h
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| J.Array [J.String "T*"] -> O.Op_T'
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| J.Array [J.String "EMC"] -> O.Op_EMC
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| J.Array [J.String "BX"] -> O.Op_BX
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| J.Array [J.String "EX"] -> O.Op_EX
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| J.Array [a; b; c; d; J.String "re"] -> O.Op_re (opf a, opf b, opf c, opf d)
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| J.Array [a; b; c; d; J.String "k"] -> O.Op_k (opf a, opf b, opf c, opf d)
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| J.Array [a; b; J.String "m"] -> O.Op_m (opf a, opf b)
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| J.Array [a; b; J.String "l"] -> O.Op_l (opf a, opf b)
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| J.Array [J.String s; obj; J.String "BDC"] -> O.Op_BDC (s, object_of_json obj)
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| J.Array [J.String s; J.String "gs"] -> O.Op_gs s
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| J.Array [J.String s; J.String "Do"] -> O.Op_Do s
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| J.Array [J.String s; J.String "CS"] -> O.Op_CS s
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| J.Array [i; J.String "j"] -> O.Op_j (opi i)
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| J.Array [a; b; c; d; e; f; J.String "cm"] ->
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O.Op_cm
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{Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c;
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Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f}
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| J.Array [J.Array fls; y; J.String "d"] -> O.Op_d (map opf fls, opf y)
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| J.Array [a; J.String "w"] -> O.Op_w (opf a)
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| J.Array [a; J.String "J"] -> O.Op_J (opi a)
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| J.Array [a; J.String "M"] -> O.Op_M (opf a)
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| J.Array [J.String s; J.String "ri"] -> O.Op_ri s
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| J.Array [a; J.String "i"] -> O.Op_i (opi a)
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| J.Array [a; b; c; d; e; f; J.String "c"] -> O.Op_c (opf a, opf b, opf c, opf d, opf e, opf f)
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| J.Array [a; b; c; d; J.String "v"] -> O.Op_v (opf a, opf b, opf c, opf d)
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| J.Array [a; b; c; d; J.String "y"] -> O.Op_y (opf a, opf b, opf c, opf d)
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| J.Array [a; J.String "Tc"] -> O.Op_Tc (opf a)
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| J.Array [a; J.String "Tw"] -> O.Op_Tw (opf a)
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| J.Array [a; J.String "Tz"] -> O.Op_Tz (opf a)
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| J.Array [a; J.String "TL"] -> O.Op_TL (opf a)
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| J.Array [J.String k; n; J.String "Tf"] -> O.Op_Tf (k, opf n)
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| J.Array [a; J.String "Tr"] -> O.Op_Tr (opi a)
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| J.Array [a; J.String "Ts"] -> O.Op_Ts (opf a)
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| J.Array [a; b; J.String "Td"] -> O.Op_Td (opf a, opf b)
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| J.Array [a; b; J.String "TD"] -> O.Op_TD (opf a, opf b)
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| J.Array [a; b; c; d; e; f; J.String "Tm"] ->
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O.Op_Tm
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{Pdftransform.a = opf a; Pdftransform.b = opf b; Pdftransform.c = opf c;
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Pdftransform.d = opf d; Pdftransform.e = opf e; Pdftransform.f = opf f}
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| J.Array [J.String s; J.String "Tj"] -> Op_Tj s
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| J.Array [obj; J.String "TJ"] -> Op_TJ (object_of_json obj)
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| J.Array [J.String s; J.String "'"] -> Op_' s
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| J.Array [a; b; J.String s; J.String "''"] -> Op_'' (opf a, opf b, s)
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| J.Array [a; b; J.String "d0"] -> Op_d0 (opf a, opf b)
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| J.Array [a; b; c; d; e; f; J.String "d1"] -> Op_d1 (opf a, opf b, opf c, opf d, opf e, opf f)
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| J.Array [J.String s; J.String "cs"] -> Op_cs s
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| J.Array [a; J.String "G"] -> Op_G (opf a);
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| J.Array [a; J.String "g"] -> Op_g (opf a);
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| J.Array [a; b; c; J.String "RG"] -> Op_RG (opf a, opf b, opf c);
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| J.Array [a; b; c; J.String "rg"] -> Op_rg (opf a, opf b, opf c);
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| J.Array [a; b; c; d; J.String "K"] -> Op_K (opf a, opf b, opf c, opf d);
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| J.Array [J.String s; J.String "sh"] -> Op_sh s;
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| J.Array [J.String s; J.String "MP"] -> Op_MP s;
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| J.Array [J.String s; J.String "BMC"] -> Op_BMC s;
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| J.Array [J.String s; J.String "Unknown"] -> O.Op_Unknown s
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| J.Array [J.String s; obj; J.String "DP"] -> O.Op_DP (s, object_of_json obj)
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| J.Array [a; J.String b; J.String "InlineImage"] ->
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O.InlineImage (object_of_json a, Pdfio.bytes_of_string b)
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| J.Array torev ->
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begin match rev torev with
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| J.String "SCN"::ns -> O.Op_SCN (map opf (rev ns))
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| J.String "SC"::ns -> O.Op_SCN (map opf (rev ns))
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| J.String "sc"::ns -> O.Op_SCN (map opf (rev ns))
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| J.String "scn"::ns -> O.Op_SCN (map opf (rev ns))
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| J.String "SCNName"::J.String s::ns -> O.Op_SCNName (s, map opf (rev ns))
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| J.String "scnName"::J.String s::ns -> O.Op_scnName (s, map opf (rev ns))
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| j ->
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Printf.eprintf "Unable to read reversed op from %s\n" (J.show (J.Array j));
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error "op reading failed"
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end
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| j ->
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Printf.eprintf "Unable to read op from %s\n" (J.show j);
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error "op reading failed"
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and object_of_json = function
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| J.Null -> P.Null
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| J.Bool b -> P.Boolean b
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| J.Number n -> Pdf.Indirect (int_of_string n)
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| J.String s -> P.String s
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| J.Array objs -> P.Array (map object_of_json objs)
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| J.Object ["I", J.Number i] -> P.Integer (int_of_string i)
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| J.Object ["F", J.Number f] -> P.Real (float_of_string f)
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| J.Object ["N", J.String n] -> P.Name n
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| J.Object ["S", J.Array [dict; J.String data]] ->
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P.Stream (ref (object_of_json dict, P.Got (Pdfio.bytes_of_string data)))
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| J.Object ["S", J.Array [dict; J.Array parsed_ops]] ->
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Pdfops.stream_of_ops (List.map op_of_json parsed_ops)
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| J.Object elts -> P.Dictionary (map (fun (n, o) -> (n, object_of_json o)) elts)
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let rec json_of_object pdf fcs no_stream_data = function
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| P.Null -> J.Null
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| P.Boolean b -> J.Bool b
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| P.Integer i -> J.Object [("I", J.Number (soi i))]
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| P.Real r -> J.Object [("F", J.Number (sof r))]
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| P.String s -> J.String s
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| P.Name n -> J.Object [("N", J.String n)]
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| P.Array objs -> J.Array (map (json_of_object pdf fcs no_stream_data) objs)
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| P.Dictionary elts ->
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iter
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(function
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("/Contents", P.Indirect i) ->
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begin match Pdf.lookup_obj pdf i with
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| Pdf.Array is -> iter (function Pdf.Indirect i -> fcs i | _ -> ()) is
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| _ -> fcs i
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end
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| ("/Contents", P.Array elts) -> iter (function P.Indirect i -> fcs i | _ -> ()) elts
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| _ -> ())
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elts;
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J.Object (map (fun (k, v) -> (k, json_of_object pdf fcs no_stream_data v)) elts)
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| P.Stream ({contents = (P.Dictionary dict as d, stream)} as mut) as thestream ->
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P.getstream thestream;
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let str =
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begin match P.lookup_direct pdf "/FunctionType" d with
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| Some _ ->
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Pdfcodec.decode_pdfstream_until_unknown pdf thestream;
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begin match !mut with (_, P.Got b) -> Pdfio.string_of_bytes b | _ -> "failure: decomp" end
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| None ->
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if no_stream_data then "<<stream data elided>>" else
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match stream with P.Got b -> Pdfio.string_of_bytes b | P.ToGet _ -> "failure: toget"
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end
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in
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json_of_object pdf fcs no_stream_data (P.Dictionary [("S", P.Array [P.Dictionary dict; P.String str])])
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| P.Stream _ -> J.String "error: stream with not-a-dictionary"
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| P.Indirect i ->
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begin match P.lookup_obj pdf i with
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| P.Stream {contents = (P.Dictionary dict as d, _)} ->
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begin match P.lookup_direct pdf "/Subtype" d with
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| Some (P.Name "/Form") -> fcs i
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| _ -> ()
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end
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| _ -> ()
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end;
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J.Number (soi i)
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let json_of_op pdf no_stream_data = function
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| O.Op_S -> J.Array [J.String "S"]
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| O.Op_s -> J.Array [J.String "s"]
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| O.Op_f -> J.Array [J.String "f"]
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| O.Op_F -> J.Array [J.String "F"]
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| O.Op_f' ->J.Array [J.String "f*"]
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| O.Op_B -> J.Array [J.String "B"]
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| O.Op_B' -> J.Array [J.String "B*"]
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| O.Op_b -> J.Array [J.String "b"]
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| O.Op_b' -> J.Array [J.String "b*"]
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| O.Op_n -> J.Array [J.String "n"]
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| O.Op_W -> J.Array [J.String "W"]
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| O.Op_W' -> J.Array [J.String "W*"]
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| O.Op_BT -> J.Array [J.String "BT"]
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| O.Op_ET -> J.Array [J.String "ET"]
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| O.Op_q -> J.Array [J.String "q"]
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| O.Op_Q -> J.Array [J.String "Q"]
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| O.Op_h -> J.Array [J.String "h"]
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| O.Op_T' -> J.Array [J.String "T*"]
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| O.Op_EMC -> J.Array [J.String "EMC"]
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| O.Op_BX -> J.Array [J.String "BX"]
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| O.Op_EX -> J.Array [J.String "EX"]
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| O.Op_re (a, b, c, d) ->
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J.Array [J.Number (sof a); J.Number (sof b); J.Number (sof c); J.Number (sof d); J.String "re"]
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| O.Op_k (c, m, y, k) ->
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J.Array [J.Number (sof c); J.Number (sof m); J.Number (sof y); J.Number (sof k); J.String "k"]
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| O.Op_m (a, b) -> J.Array [J.Number (sof a); J.Number (sof b); J.String "m"]
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| O.Op_l (a, b) -> J.Array [J.Number (sof a); J.Number (sof b); J.String "l"]
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| O.Op_BDC (s, obj) -> J.Array [J.String s; json_of_object pdf (fun _ -> ()) no_stream_data obj; J.String "BDC"]
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| O.Op_gs s -> J.Array [J.String s; J.String "gs"]
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| O.Op_Do s -> J.Array [J.String s; J.String "Do"]
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| O.Op_CS s -> J.Array [J.String s; J.String "CS"]
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| O.Op_SCN fs -> J.Array ((map (fun x -> J.Number (sof x)) fs) @ [J.String "SCN"])
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| O.Op_j j -> J.Array [J.Number (soi j); J.String "j"]
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| O.Op_cm t ->
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J.Array
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[J.Number (sof t.Pdftransform.a); J.Number (sof t.Pdftransform.b); J.Number (sof t.Pdftransform.c);
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J.Number (sof t.Pdftransform.d); J.Number (sof t.Pdftransform.e); J.Number (sof t.Pdftransform.f);
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J.String "cm"]
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| O.Op_d (fl, y) ->
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J.Array [J.Array (map (fun x -> J.Number (sof x)) fl); J.Number (sof y); J.String "d"]
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| O.Op_w w -> J.Array [J.Number (sof w); J.String "w"]
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| O.Op_J j -> J.Array [J.Number (soi j); J.String "J"]
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| O.Op_M m -> J.Array [J.Number (sof m); J.String "M"]
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| O.Op_ri s -> J.Array [J.String s; J.String "ri"]
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| O.Op_i i -> J.Array [J.Number (soi i); J.String "i"]
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| O.Op_c (a, b, c, d, e, k) ->
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J.Array
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[J.Number (sof a); J.Number (sof b); J.Number (sof c);
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J.Number (sof d); J.Number (sof e); J.Number (sof k); J.String "c"]
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| O.Op_v (a, b, c, d) ->
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J.Array
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[J.Number (sof a); J.Number (sof b); J.Number (sof c);
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J.Number (sof d); J.String "v"]
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| O.Op_y (a, b, c, d) ->
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J.Array
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[J.Number (sof a); J.Number (sof b); J.Number (sof c);
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J.Number (sof d); J.String "y"]
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| O.Op_Tc c -> J.Array [J.Number (sof c); J.String "Tc"]
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| O.Op_Tw w -> J.Array [J.Number (sof w); J.String "Tw"]
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| O.Op_Tz z -> J.Array [J.Number (sof z); J.String "Tz"]
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| O.Op_TL l -> J.Array [J.Number (sof l); J.String "TL"]
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| O.Op_Tf (k, s) -> J.Array [J.String k; J.Number (sof s); J.String "Tf"]
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| O.Op_Tr i -> J.Array [J.Number (soi i); J.String "Tr"]
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| O.Op_Ts k -> J.Array [J.Number (sof k); J.String "Ts"]
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| O.Op_Td (k, k') -> J.Array [J.Number (sof k); J.Number (sof k'); J.String "Td"]
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| O.Op_TD (k, k') -> J.Array [J.Number (sof k); J.Number (sof k'); J.String "TD"]
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| O.Op_Tm t ->
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J.Array
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[J.Number (sof t.Pdftransform.a); J.Number (sof t.Pdftransform.b); J.Number (sof t.Pdftransform.c);
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J.Number (sof t.Pdftransform.d); J.Number (sof t.Pdftransform.e); J.Number (sof t.Pdftransform.f);
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J.String "Tm"]
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| O.Op_Tj s -> J.Array [J.String s; J.String "Tj"]
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| O.Op_TJ pdfobject -> J.Array [json_of_object pdf (fun _ -> ()) no_stream_data pdfobject; J.String "TJ"]
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| O.Op_' s -> J.Array [J.String s; J.String "'"]
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| O.Op_'' (k, k', s) -> J.Array [J.Number (sof k); J.Number (sof k'); J.String s; J.String "''"]
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| O.Op_d0 (k, k') -> J.Array [J.Number (sof k); J.Number (sof k'); J.String "d0"]
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| O.Op_d1 (a, b, c, d, e, k) ->
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J.Array
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[J.Number (sof a); J.Number (sof b); J.Number (sof c);
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J.Number (sof d); J.Number (sof e); J.Number (sof k); J.String "d1"]
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| O.Op_cs s -> J.Array [J.String s; J.String "cs"]
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| O.Op_SC fs -> J.Array (map (fun x -> J.Number (sof x)) fs @ [J.String "SC"])
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| O.Op_sc fs -> J.Array (map (fun x -> J.Number (sof x)) fs @ [J.String "sc"])
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| O.Op_scn fs -> J.Array (map (fun x -> J.Number (sof x)) fs @ [J.String "scn"])
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| O.Op_G k -> J.Array [J.Number (sof k); J.String "G"]
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| O.Op_g k -> J.Array [J.Number (sof k); J.String "g"]
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| O.Op_RG (r, g, b) -> J.Array [J.Number (sof r); J.Number (sof g); J.Number (sof b); J.String "RG"]
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| O.Op_rg (r, g, b) -> J.Array [J.Number (sof r); J.Number (sof g); J.Number (sof b); J.String "rg"]
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| O.Op_K (c, m, y, k) -> J.Array [J.Number (sof c); J.Number (sof m); J.Number (sof y); J.Number (sof k); J.String "K"]
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| O.Op_sh s -> J.Array [J.String s; J.String "sh"]
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| O.Op_MP s -> J.Array [J.String s; J.String "MP"]
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| O.Op_BMC s -> J.Array [J.String s; J.String "BMC"]
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| O.Op_Unknown s -> J.Array [J.String s; J.String "Unknown"]
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| O.Op_SCNName (s, fs) ->
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J.Array (map (fun x -> J.Number (sof x)) fs @ [J.String s; J.String "SCNName"])
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| O.Op_scnName (s, fs) ->
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J.Array (map (fun x -> J.Number (sof x)) fs @ [J.String s; J.String "scnName"])
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| O.InlineImage (dict, data) -> J.Array [json_of_object pdf (fun _ -> ()) no_stream_data dict; J.String (Pdfio.string_of_bytes data); J.String "InlineImage"]
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| O.Op_DP (s, obj) -> J.Array [J.String s; json_of_object pdf (fun _ -> ()) no_stream_data obj; J.String "DP"]
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(* parse_stream needs pdf and resources. These are for lexing of inline images,
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* looking up the colourspace. We do not need to worry about inherited
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* resources, though? For now, don't worry about inherited resources: check in
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* PDF standard. *)
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let parse_content_stream pdf resources bs =
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let ops = O.parse_stream pdf resources [bs] in
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J.Array (map (json_of_op pdf false) ops)
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(* We need to make sure each page only has one page content stream. Otherwise,
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if not split on op boundaries, each one would fail to parse on its own. *)
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(* Future improvement. Don't blow up shared content streams. *)
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let precombine_page_content pdf =
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let pages' =
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map
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(fun page ->
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match page.Pdfpage.content with
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[] | [_] -> page
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| _ ->
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let operators =
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Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content
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in
|
|
{page with Pdfpage.content = [Pdfops.stream_of_ops operators]}
|
|
)
|
|
(Pdfpage.pages_of_pagetree pdf)
|
|
in
|
|
Pdfpage.change_pages true pdf pages'
|
|
|
|
let json_of_pdf parse_content no_stream_data pdf =
|
|
let pdf = if parse_content then precombine_page_content pdf else pdf in
|
|
Pdf.remove_unreferenced pdf;
|
|
let trailerdict = (0, json_of_object pdf (fun x -> ()) no_stream_data pdf.P.trailerdict) in
|
|
let parameters =
|
|
(-1, json_of_object pdf (fun x -> ()) false
|
|
(Pdf.Dictionary [("/CPDFJSONformatversion", Pdf.Integer 2);
|
|
("/CPDFJSONcontentparsed", Pdf.Boolean parse_content);
|
|
("/CPDFJSONstreamdataincluded", Pdf.Boolean (not no_stream_data));
|
|
("/CPDFJSONmajorpdfversion", Pdf.Integer pdf.Pdf.major);
|
|
("/CPDFJSONminorpdfversion", Pdf.Integer pdf.Pdf.minor);
|
|
]))
|
|
in
|
|
let content_streams = ref [] in
|
|
let fcs n = content_streams := n::!content_streams in
|
|
let pairs =
|
|
let ps = ref [] in
|
|
P.objiter
|
|
(fun i pdfobj ->
|
|
ps := (i, json_of_object pdf fcs no_stream_data pdfobj)::!ps)
|
|
pdf;
|
|
parameters::trailerdict::!ps
|
|
in
|
|
if parse_content then
|
|
iter (fun n -> Pdfcodec.decode_pdfstream_until_unknown pdf (P.lookup_obj pdf n)) !content_streams;
|
|
let pairs_parsed =
|
|
if not parse_content then pairs else
|
|
map
|
|
(fun (objnum, obj) ->
|
|
if mem objnum !content_streams then
|
|
begin match obj with
|
|
| J.Object ["S", J.Array [dict; J.String _]] ->
|
|
(* FIXME Proper resources here for reasons explained above? *)
|
|
let streamdata =
|
|
match P.lookup_obj pdf objnum with
|
|
| P.Stream {contents = (_, P.Got b)} -> b
|
|
| _ -> error "JSON: stream not decoded"
|
|
in
|
|
(objnum, J.Object ["S", J.Array [dict; parse_content_stream pdf (P.Dictionary []) streamdata]])
|
|
| _ -> error "json_of_pdf: stream parsing inconsistency"
|
|
end
|
|
else
|
|
(objnum, obj))
|
|
pairs
|
|
in
|
|
J.Array
|
|
(map
|
|
(fun (objnum, jsonobj) -> J.Array [J.Number (soi objnum); jsonobj])
|
|
pairs_parsed)
|
|
|
|
let pdf_of_json json =
|
|
(*flprint (J.show json);
|
|
flprint "\n";*)
|
|
let objs = match json with J.Array objs -> objs | _ -> error "bad json top level" in
|
|
let params = ref Pdf.Null in
|
|
let trailerdict = ref Pdf.Null in
|
|
let objects =
|
|
option_map
|
|
(function
|
|
| J.Array [J.Number n; o] ->
|
|
let objnum = int_of_string n in
|
|
begin match objnum with
|
|
| -1 -> params := object_of_json o; None
|
|
| 0 -> trailerdict := object_of_json o; None
|
|
| n when n < 0 -> None
|
|
| n -> Some (n, object_of_json o)
|
|
end
|
|
| _ -> error "json bad obj")
|
|
objs
|
|
in
|
|
(*List.
|
|
iter (fun (i, o) -> flprint (soi i); flprint "\n"; flprint (Pdfwrite.string_of_pdf o); flprint "\n") objects;*)
|
|
begin match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONstreamdataincluded" !params with
|
|
| Some (Pdf.Boolean false) -> error "no stream data; cannot reconstruct PDF"
|
|
| _ -> ()
|
|
end;
|
|
let major =
|
|
match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONmajorpdfversion" !params with
|
|
Some (Pdf.Integer i) -> i | _ -> error "bad major version"
|
|
in
|
|
let minor =
|
|
match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONminorpdfversion" !params with
|
|
Some (Pdf.Integer i) -> i | _ -> error "bad minor version"
|
|
in
|
|
(*flprint (Pdfwrite.string_of_pdf !trailerdict);*)
|
|
let root =
|
|
match !trailerdict with Pdf.Dictionary d ->
|
|
begin match lookup "/Root" d with
|
|
Some (Pdf.Indirect i) -> i | _ -> error "bad root"
|
|
end
|
|
| _ -> error "bad root 2"
|
|
in
|
|
let objmap = P.pdfobjmap_empty () in
|
|
List.iter (fun (k, v) -> Hashtbl.add objmap k (ref (P.Parsed v), 0)) objects;
|
|
let objects =
|
|
{P.maxobjnum = 0;
|
|
P.parse = None;
|
|
P.pdfobjects = objmap;
|
|
P.object_stream_ids = Hashtbl.create 0}
|
|
in
|
|
{P.major;
|
|
P.minor;
|
|
P.root;
|
|
P.objects;
|
|
P.trailerdict = !trailerdict;
|
|
P.was_linearized = false;
|
|
P.saved_encryption = None}
|
|
|
|
(* FIXME Proper streaming to output / from input, rather than making a big string first. *)
|
|
let to_output o parse_content no_stream_data pdf =
|
|
let b = Buffer.create 256 in
|
|
let formatter = Format.formatter_of_buffer b in
|
|
J.format formatter (json_of_pdf parse_content no_stream_data pdf);
|
|
Format.pp_print_flush formatter ();
|
|
o.Pdfio.output_string (Buffer.contents b)
|
|
|
|
let of_input i =
|
|
pdf_of_json (J.parse (Pdfio.string_of_bytes (Pdfio.bytes_of_input i 0 (i.Pdfio.in_channel_length))))
|