560 lines
23 KiB
OCaml
560 lines
23 KiB
OCaml
(* Read and write PDF files in JSON format.
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Format version 3: adds UTF8 option for strings for easier editing
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Format version 2: adds object -1 with format data, roundtripping
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Format version 1: no format specifier, output only
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The file is an array of arrays containing an object number followed by an
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object, one for each object in the file and two special ones:
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Object -1: CPDF's own data with the PDF version number, CPDF JSON format
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number, and flags used when writing (which may be required when reading):
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o /CPDFJSONformatversion (CPDFJSON integer (see below), currently 3)
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o /CPDFJSONcontentparsed (boolean, true if content streams have been parsed)
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o /CPDFJSONstreamdataincluded (boolean, true if stream data included. Cannot
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round-trip if false).
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o /CPDFJSONmajorpdfversion (CPDFJSON integer)
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o /CPDFJSONminorpdfversion (CPDFJSON integer)
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o /CPDFJSONisUTF8 (Optional. Format 3. If true, strings are converted to UTF8
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before conversion to JSON, and converted back to PDFDocEncoding/UTF16BE during
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converstion to PDF.)
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Object 0: The PDF's trailer dictionary
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Objects 1..n: The PDF's objects.
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o PDF arrays, dictionaries, booleans, and strings are the same in JSON.
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o Integers are written as {"I": 0}
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o Floats are written as {"F": 0.0}
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o Names are written as {"N": "/Pages"}
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o Indirect references are integers
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o Streams are {"S": [dict, data]}
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o Strings are converted into JSON strings in a way which is fully reversible.
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There are two subformats: parsing content streams or not. Hello World in CPDF
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JSON without parsing content streams:
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[
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[
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-1, { "/CPDFJSONformatversion": { "I": 2 },
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"/CPDFJSONcontentparsed": false, "/CPDFJSONstreamdataincluded": true,
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"/CPDFJSONmajorpdfversion": { "I": 1 },
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"/CPDFJSONminorpdfversion": { "I": 1 } } ], [
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0, { "/Size": { "I": 4 }, "/Root": 4,
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"/ID": [ "èÎ25\u001e³/°q:OÊ°u", "èÎ25\u001e³/°q:OÊ°u" ] } ], [
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1, { "/Type": { "N": "/Pages" }, "/Kids": [ 3 ], "/Count": { "I": 1 } } ],
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[
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2, {
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"S": [
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{ "/Length": { "I": 49 } },
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"1 0 0 1 50 770 cm BT/F0 36 Tf(Hello, World!)Tj ET"
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] } ], [
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3, { "/Type": { "N": "/Page" }, "/Parent": 1,
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"/Resources": {
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"/Font": {
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"/F0": {
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"/Type": { "N": "/Font" },
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"/Subtype": { "N": "/Type1" },
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"/BaseFont": { "N": "/Times-Italic" }
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}
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}
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},
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"/MediaBox": [
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{ "I": 0 }, { "I": 0 }, { "F": 595.2755905510001 }, { "F": 841.88976378 }
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], "/Rotate": { "I": 0 }, "/Contents": [ 2 ] } ], [
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4, { "/Type": { "N": "/Catalog" }, "/Pages": 1 } ]
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]
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Alternative object number 2 when parsing of object streams in operation:
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2, {
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"S": [
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{}, [
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[
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{ "F": 1.0 }, { "F": 0.0 }, { "F": 0.0 }, { "F": 1.0 }, { "F": 50.0 }, {
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"F": 770.0 }, "cm" ], [ "BT" ], [ "/F0", { "F": 36.0 }, "Tf" ], [
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"Hello, World!", "Tj" ], [ "ET" ] ]
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] } ], [
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When parsing content streams:
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o Each operation is an array
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o The 'operation' for inline images is "InlineImage"
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CPDF currently never preserves object streams, and only outputs unencrypted files.
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When reloading a JSON file, CPDF knows how to correct or add /Length entries in
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streams, so you need not worry about them. *)
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open Pdfutil
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open Cpdferror
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module J = Cpdfyojson.Safe
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module P = Pdf
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module O = Pdfops
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let opf = function
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| `Assoc ["F", `Float f] -> f
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| `Assoc ["F", `Int i] -> float_of_int i
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| _ -> error "num: not a float"
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let opi = function
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| `Assoc ["I", `Int i] -> i
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| `Assoc ["I", `Float f] -> int_of_float f
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| _ -> error "num: not an integer"
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let rec op_of_json utf8 = function
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| `List [`String "S"] -> O.Op_S
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| `List [`String "s"] -> O.Op_s
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| `List [`String "f"] -> O.Op_f
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| `List [`String "F"] -> O.Op_F
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| `List [`String "f*"] -> O.Op_f'
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| `List [`String "B"] -> O.Op_B
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| `List [`String "B*"] -> O.Op_B'
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| `List [`String "b"] -> O.Op_b
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| `List [`String "b*"] -> O.Op_b'
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| `List [`String "n"] -> O.Op_n
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| `List [`String "W"] -> O.Op_W
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| `List [`String "W*"] -> O.Op_W'
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| `List [`String "BT"] -> O.Op_BT
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| `List [`String "ET"] -> O.Op_ET
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| `List [`String "q"] -> O.Op_q
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| `List [`String "Q"] -> O.Op_Q
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| `List [`String "h"] -> O.Op_h
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| `List [`String "T*"] -> O.Op_T'
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| `List [`String "EMC"] -> O.Op_EMC
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| `List [`String "BX"] -> O.Op_BX
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| `List [`String "EX"] -> O.Op_EX
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| `List [a; b; c; d; `String "re"] -> O.Op_re (opf a, opf b, opf c, opf d)
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| `List [a; b; c; d; `String "k"] -> O.Op_k (opf a, opf b, opf c, opf d)
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| `List [a; b; `String "m"] -> O.Op_m (opf a, opf b)
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| `List [a; b; `String "l"] -> O.Op_l (opf a, opf b)
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| `List [`String s; obj; `String "BDC"] -> O.Op_BDC (s, object_of_json ~utf8 obj)
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| `List [`String s; `String "gs"] -> O.Op_gs s
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| `List [`String s; `String "Do"] -> O.Op_Do s
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| `List [`String s; `String "CS"] -> O.Op_CS s
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| `List [i; `String "j"] -> O.Op_j (opi i)
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| `List [a; b; c; d; e; f; `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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| `List [`List fls; y; `String "d"] -> O.Op_d (map opf fls, opf y)
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| `List [a; `String "w"] -> O.Op_w (opf a)
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| `List [a; `String "J"] -> O.Op_J (opi a)
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| `List [a; `String "M"] -> O.Op_M (opf a)
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| `List [`String s; `String "ri"] -> O.Op_ri s
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| `List [a; `String "i"] -> O.Op_i (opi a)
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| `List [a; b; c; d; e; f; `String "c"] -> O.Op_c (opf a, opf b, opf c, opf d, opf e, opf f)
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| `List [a; b; c; d; `String "v"] -> O.Op_v (opf a, opf b, opf c, opf d)
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| `List [a; b; c; d; `String "y"] -> O.Op_y (opf a, opf b, opf c, opf d)
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| `List [a; `String "Tc"] -> O.Op_Tc (opf a)
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| `List [a; `String "Tw"] -> O.Op_Tw (opf a)
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| `List [a; `String "Tz"] -> O.Op_Tz (opf a)
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| `List [a; `String "TL"] -> O.Op_TL (opf a)
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| `List [`String k; n; `String "Tf"] -> O.Op_Tf (k, opf n)
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| `List [a; `String "Tr"] -> O.Op_Tr (opi a)
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| `List [a; `String "Ts"] -> O.Op_Ts (opf a)
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| `List [a; b; `String "Td"] -> O.Op_Td (opf a, opf b)
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| `List [a; b; `String "TD"] -> O.Op_TD (opf a, opf b)
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| `List [a; b; c; d; e; f; `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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| `List [`String s; `String "Tj"] -> Op_Tj s
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| `List [obj; `String "TJ"] -> Op_TJ (object_of_json ~utf8 obj)
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| `List [`String s; `String "'"] -> Op_' s
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| `List [a; b; `String s; `String "''"] -> Op_'' (opf a, opf b, s)
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| `List [a; b; `String "d0"] -> Op_d0 (opf a, opf b)
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| `List [a; b; c; d; e; f; `String "d1"] -> Op_d1 (opf a, opf b, opf c, opf d, opf e, opf f)
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| `List [`String s; `String "cs"] -> Op_cs s
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| `List [a; `String "G"] -> Op_G (opf a);
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| `List [a; `String "g"] -> Op_g (opf a);
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| `List [a; b; c; `String "RG"] -> Op_RG (opf a, opf b, opf c);
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| `List [a; b; c; `String "rg"] -> Op_rg (opf a, opf b, opf c);
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| `List [a; b; c; d; `String "K"] -> Op_K (opf a, opf b, opf c, opf d);
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| `List [`String s; `String "sh"] -> Op_sh s;
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| `List [`String s; `String "MP"] -> Op_MP s;
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| `List [`String s; `String "BMC"] -> Op_BMC s;
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| `List [`String s; `String "Unknown"] -> O.Op_Unknown s
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| `List [`String s; obj; `String "DP"] -> O.Op_DP (s, object_of_json ~utf8 obj)
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| `List [a; `String b; `String "InlineImage"] ->
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O.InlineImage (object_of_json ~utf8 a, Pdfio.bytes_of_string b)
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| `List torev ->
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begin match rev torev with
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| `String "SCN"::ns -> O.Op_SCN (map opf (rev ns))
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| `String "SC"::ns -> O.Op_SC (map opf (rev ns))
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| `String "sc"::ns -> O.Op_sc (map opf (rev ns))
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| `String "scn"::ns -> O.Op_scn (map opf (rev ns))
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| `String "SCNName"::`String s::ns -> O.Op_SCNName (s, map opf (rev ns))
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| `String "scnName"::`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 (`List 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 ~utf8 = function
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| `Null -> P.Null
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| `Bool b -> P.Boolean b
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| `Int n -> Pdf.Indirect n
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| `String s -> if utf8 then P.String (Pdftext.pdfdocstring_of_utf8 s) else P.String s
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| `List objs -> P.Array (map (object_of_json ~utf8) objs)
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| `Assoc ["I", `Int i] -> P.Integer i
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| `Assoc ["F", `Float f] -> P.Real f
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| `Assoc ["N", `String n] -> P.Name n
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| `Assoc ["S", `List [dict; `String data]] ->
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let d' =
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P.add_dict_entry (object_of_json ~utf8 dict) "/Length" (P.Integer (String.length data))
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in
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P.Stream (ref (d', P.Got (Pdfio.bytes_of_string data)))
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| `Assoc ["S", `List [dict; `List parsed_ops]] ->
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begin match
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Pdfops.stream_of_ops (List.map (op_of_json utf8) parsed_ops)
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with
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| P.Stream {contents = (_, Pdf.Got data)} ->
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let d' =
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P.add_dict_entry (object_of_json ~utf8 dict) "/Length" (P.Integer (Pdfio.bytes_size data))
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in
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P.Stream (ref (d', Pdf.Got data))
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| _ -> assert false
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end
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| `Assoc elts -> P.Dictionary (map (fun (n, o) -> (n, object_of_json ~utf8 o)) elts)
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| _ -> error "not recognised in object_of_json"
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let pdf_of_json json =
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let objs = match json with `List objs -> objs | _ -> error "bad json top level" in
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let params = ref Pdf.Null in
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let utf8 = ref false in
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let read_utf8 () =
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match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONisUTF8" !params with
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Some (Pdf.Boolean b) -> utf8 := b | _ -> ()
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in
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let trailerdict = ref Pdf.Null in
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let objects =
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option_map
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(function
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| `List [`Int objnum; o] ->
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begin match objnum with
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| -1 -> params := object_of_json ~utf8:false o; read_utf8 (); None
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| 0 -> trailerdict := object_of_json ~utf8:!utf8 o; None
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| n when n < 0 -> None
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| n -> Some (n, object_of_json ~utf8:!utf8 o)
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end
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| _ -> error "json bad obj")
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objs
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in
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begin match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONstreamdataincluded" !params with
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| Some (Pdf.Boolean false) -> error "no stream data; cannot reconstruct PDF"
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| _ -> ()
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end;
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let major =
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match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONmajorpdfversion" !params with
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Some (Pdf.Integer i) -> i | _ -> error "bad major version"
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in
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let minor =
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match Pdf.lookup_direct (Pdf.empty ()) "/CPDFJSONminorpdfversion" !params with
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Some (Pdf.Integer i) -> i | _ -> error "bad minor version"
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in
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let root =
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match !trailerdict with Pdf.Dictionary d ->
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begin match lookup "/Root" d with
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Some (Pdf.Indirect i) -> i | _ -> error "bad root"
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end
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| _ -> error "bad root 2"
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in
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let objmap = P.pdfobjmap_empty () in
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List.iter (fun (k, v) -> Hashtbl.add objmap k (ref (P.Parsed v), 0)) objects;
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let objects =
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{P.maxobjnum = 0;
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P.parse = None;
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P.pdfobjects = objmap;
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P.object_stream_ids = Hashtbl.create 0}
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in
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{P.major;
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P.minor;
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P.root;
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P.objects;
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P.trailerdict = !trailerdict;
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P.was_linearized = false;
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P.saved_encryption = None}
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let mkfloat f = `Assoc [("F", `Float f)]
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let mkint i = `Assoc [("I", `Int i)]
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let mkname n = `Assoc [("N", `String n)]
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let rec json_of_object ~utf8 ?(clean_strings=false) pdf fcs ~no_stream_data ~parse_content = function
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| P.Null -> `Null
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| P.Boolean b -> `Bool b
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| P.Integer i -> mkint i
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| P.Real r -> mkfloat r
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| P.String s -> `String (if clean_strings then Pdftext.simplify_utf16be s else if utf8 then Pdftext.utf8_of_pdfdocstring s else s)
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| P.Name n -> mkname n
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| P.Array objs -> `List (map (json_of_object ~utf8 pdf fcs ~no_stream_data ~parse_content) 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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`Assoc (map (fun (k, v) -> (k, json_of_object ~utf8 pdf fcs ~no_stream_data ~parse_content 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, dict' =
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match P.lookup_direct pdf "/FunctionType" d, parse_content with
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| Some _, true ->
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Pdfcodec.decode_pdfstream_until_unknown pdf thestream;
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let dict = P.remove_dict_entry d "/Filter" in
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begin match !mut with (_, P.Got b) -> (Pdfio.string_of_bytes b, dict) | _ -> error "/FunctionType: failure: decomp" end
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| _ ->
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if no_stream_data then ("<<stream data elided>>", d) else
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match !mut with (_, P.Got b) -> (Pdfio.string_of_bytes b, d) | _ -> error "failure: toget"
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in
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json_of_object ~utf8 pdf fcs ~no_stream_data ~parse_content (P.Dictionary [("S", P.Array [dict'; P.String str])])
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| P.Stream _ -> error "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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begin match P.lookup_direct pdf "/Type" d with
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| Some (P.Name "/Pattern") -> fcs i
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| _ -> ()
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end
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end
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| _ -> ()
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end;
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`Int i
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let json_of_op utf8 pdf no_stream_data = function
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| O.Op_S -> `List [`String "S"]
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| O.Op_s -> `List [`String "s"]
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| O.Op_f -> `List [`String "f"]
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| O.Op_F -> `List [`String "F"]
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| O.Op_f' ->`List [`String "f*"]
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| O.Op_B -> `List [`String "B"]
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| O.Op_B' -> `List [`String "B*"]
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| O.Op_b -> `List [`String "b"]
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| O.Op_b' -> `List [`String "b*"]
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| O.Op_n -> `List [`String "n"]
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| O.Op_W -> `List [`String "W"]
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| O.Op_W' -> `List [`String "W*"]
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| O.Op_BT -> `List [`String "BT"]
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| O.Op_ET -> `List [`String "ET"]
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| O.Op_q -> `List [`String "q"]
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| O.Op_Q -> `List [`String "Q"]
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| O.Op_h -> `List [`String "h"]
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| O.Op_T' -> `List [`String "T*"]
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| O.Op_EMC -> `List [`String "EMC"]
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| O.Op_BX -> `List [`String "BX"]
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| O.Op_EX -> `List [`String "EX"]
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| O.Op_re (a, b, c, d) ->
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`List [mkfloat a; mkfloat b; mkfloat c; mkfloat d; `String "re"]
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| O.Op_k (c, m, y, k) ->
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`List [mkfloat c; mkfloat m; mkfloat y; mkfloat k; `String "k"]
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| O.Op_m (a, b) -> `List [mkfloat a; mkfloat b; `String "m"]
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| O.Op_l (a, b) -> `List [mkfloat a; mkfloat b; `String "l"]
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| O.Op_BDC (s, obj) -> `List [`String s; json_of_object ~utf8 pdf (fun _ -> ()) ~no_stream_data ~parse_content:false obj; `String "BDC"]
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| O.Op_gs s -> `List [`String s; `String "gs"]
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| O.Op_Do s -> `List [`String s; `String "Do"]
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| O.Op_CS s -> `List [`String s; `String "CS"]
|
||
| O.Op_SCN fs -> `List ((map (fun x -> mkfloat x) fs) @ [`String "SCN"])
|
||
| O.Op_j j -> `List [mkint j; `String "j"]
|
||
| O.Op_cm t ->
|
||
`List
|
||
[mkfloat t.Pdftransform.a; mkfloat t.Pdftransform.b; mkfloat t.Pdftransform.c;
|
||
mkfloat t.Pdftransform.d; mkfloat t.Pdftransform.e; mkfloat t.Pdftransform.f;
|
||
`String "cm"]
|
||
| O.Op_d (fl, y) ->
|
||
`List [`List (map (fun x -> mkfloat x) fl); mkfloat y; `String "d"]
|
||
| O.Op_w w -> `List [mkfloat w; `String "w"]
|
||
| O.Op_J j -> `List [mkint j; `String "J"]
|
||
| O.Op_M m -> `List [mkfloat m; `String "M"]
|
||
| O.Op_ri s -> `List [`String s; `String "ri"]
|
||
| O.Op_i i -> `List [mkint i; `String "i"]
|
||
| O.Op_c (a, b, c, d, e, f) ->
|
||
`List
|
||
[mkfloat a; mkfloat b; mkfloat c;
|
||
mkfloat d; mkfloat e; mkfloat f; `String "c"]
|
||
| O.Op_v (a, b, c, d) ->
|
||
`List
|
||
[mkfloat a; mkfloat b; mkfloat c;
|
||
mkfloat d; `String "v"]
|
||
| O.Op_y (a, b, c, d) ->
|
||
`List
|
||
[mkfloat a; mkfloat b; mkfloat c;
|
||
mkfloat d; `String "y"]
|
||
| O.Op_Tc c -> `List [mkfloat c; `String "Tc"]
|
||
| O.Op_Tw w -> `List [mkfloat w; `String "Tw"]
|
||
| O.Op_Tz z -> `List [mkfloat z; `String "Tz"]
|
||
| O.Op_TL l -> `List [mkfloat l; `String "TL"]
|
||
| O.Op_Tf (k, s) -> `List [`String k; mkfloat s; `String "Tf"]
|
||
| O.Op_Tr i -> `List [mkint i; `String "Tr"]
|
||
| O.Op_Ts k -> `List [mkfloat k; `String "Ts"]
|
||
| O.Op_Td (k, k') -> `List [mkfloat k; mkfloat k'; `String "Td"]
|
||
| O.Op_TD (k, k') -> `List [mkfloat k; mkfloat k'; `String "TD"]
|
||
| O.Op_Tm t ->
|
||
`List
|
||
[mkfloat t.Pdftransform.a; mkfloat t.Pdftransform.b; mkfloat t.Pdftransform.c;
|
||
mkfloat t.Pdftransform.d; mkfloat t.Pdftransform.e; mkfloat t.Pdftransform.f;
|
||
`String "Tm"]
|
||
| O.Op_Tj s -> `List [`String s; `String "Tj"]
|
||
| O.Op_TJ pdfobject -> `List [json_of_object ~utf8 pdf (fun _ -> ()) ~no_stream_data ~parse_content:false pdfobject; `String "TJ"]
|
||
| O.Op_' s -> `List [`String s; `String "'"]
|
||
| O.Op_'' (k, k', s) -> `List [mkfloat k; mkfloat k'; `String s; `String "''"]
|
||
| O.Op_d0 (k, k') -> `List [mkfloat k; mkfloat k'; `String "d0"]
|
||
| O.Op_d1 (a, b, c, d, e, f) ->
|
||
`List
|
||
[mkfloat a; mkfloat b; mkfloat c;
|
||
mkfloat d; mkfloat e; mkfloat f; `String "d1"]
|
||
| O.Op_cs s -> `List [`String s; `String "cs"]
|
||
| O.Op_SC fs -> `List (map (fun x -> mkfloat x) fs @ [`String "SC"])
|
||
| O.Op_sc fs -> `List (map (fun x -> mkfloat x) fs @ [`String "sc"])
|
||
| O.Op_scn fs -> `List (map (fun x -> mkfloat x) fs @ [`String "scn"])
|
||
| O.Op_G k -> `List [mkfloat k; `String "G"]
|
||
| O.Op_g k -> `List [mkfloat k; `String "g"]
|
||
| O.Op_RG (r, g, b) -> `List [mkfloat r; mkfloat g; mkfloat b; `String "RG"]
|
||
| O.Op_rg (r, g, b) -> `List [mkfloat r; mkfloat g; mkfloat b; `String "rg"]
|
||
| O.Op_K (c, m, y, k) -> `List [mkfloat c; mkfloat m; mkfloat y; mkfloat k; `String "K"]
|
||
| O.Op_sh s -> `List [`String s; `String "sh"]
|
||
| O.Op_MP s -> `List [`String s; `String "MP"]
|
||
| O.Op_BMC s -> `List [`String s; `String "BMC"]
|
||
| O.Op_Unknown s -> `List [`String s; `String "Unknown"]
|
||
| O.Op_SCNName (s, fs) ->
|
||
`List (map (fun x -> mkfloat x) fs @ [`String s; `String "SCNName"])
|
||
| O.Op_scnName (s, fs) ->
|
||
`List (map (fun x -> mkfloat x) fs @ [`String s; `String "scnName"])
|
||
| O.InlineImage (dict, data) ->
|
||
`List [json_of_object ~utf8 pdf (fun _ -> ()) ~no_stream_data ~parse_content:false dict; `String (Pdfio.string_of_bytes data); `String "InlineImage"]
|
||
| O.Op_DP (s, obj) ->
|
||
`List [`String s; json_of_object ~utf8 pdf (fun _ -> ()) ~no_stream_data ~parse_content:false obj; `String "DP"]
|
||
|
||
(* parse_stream needs pdf and resources. These are for lexing of inline images,
|
||
* looking up the colourspace. *)
|
||
let parse_content_stream utf8 pdf resources bs =
|
||
let ops = O.parse_stream pdf resources [bs] in
|
||
`List (map (json_of_op utf8 pdf false) ops)
|
||
|
||
(* Make sure each page only has one page content stream. Otherwise,
|
||
if not split on op boundaries, each one would fail to parse on its own. *)
|
||
let precombine_page_content pdf =
|
||
let pages' =
|
||
map
|
||
(fun page ->
|
||
match page.Pdfpage.content with
|
||
[] | [_] -> page
|
||
| _ ->
|
||
let operators =
|
||
Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content
|
||
in
|
||
{page with Pdfpage.content = [Pdfops.stream_of_ops operators]}
|
||
)
|
||
(Pdfpage.pages_of_pagetree pdf)
|
||
in
|
||
Pdfpage.change_pages true pdf pages'
|
||
|
||
(* Convert any strings in UTF16BE which could actually be in PDFDocEncoding
|
||
(due to having no high bytes) to make editing JSON easier. *)
|
||
let rec ppstring_single_object pdf = function
|
||
| Pdf.Dictionary d -> Pdf.recurse_dict (ppstring_single_object pdf) d
|
||
| (Pdf.Stream {contents = (Pdf.Dictionary dict, data)}) ->
|
||
Pdf.Stream {contents = (Pdf.recurse_dict (ppstring_single_object pdf) dict, data)}
|
||
| Pdf.Array a -> Pdf.recurse_array (ppstring_single_object pdf) a
|
||
| Pdf.String s -> Pdf.String (Pdftext.simplify_utf16be s)
|
||
| x -> x
|
||
|
||
(* Do all objects, but skip the trailer dictionary since may mess up /ID if it
|
||
happens to begin with UTF16BE BOM *)
|
||
let preprocess_strings pdf =
|
||
Pdf.objselfmap (ppstring_single_object pdf) pdf
|
||
|
||
let json_of_pdf
|
||
~utf8 ~parse_content ~no_stream_data ~decompress_streams ~clean_strings
|
||
pdf
|
||
=
|
||
if clean_strings then preprocess_strings pdf;
|
||
let pdf = if parse_content then precombine_page_content pdf else pdf in
|
||
if decompress_streams then
|
||
Pdf.objiter
|
||
(fun _ obj -> match obj with Pdf.Stream _ -> Pdfcodec.decode_pdfstream_until_unknown pdf obj | _ -> ())
|
||
pdf;
|
||
Pdf.remove_unreferenced pdf;
|
||
let trailerdict = (0, json_of_object ~utf8 pdf (fun x -> ()) ~no_stream_data ~parse_content:false pdf.P.trailerdict) in
|
||
let parameters =
|
||
(-1, json_of_object ~utf8 pdf (fun x -> ()) ~no_stream_data:false ~parse_content: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;
|
||
if parse_content then Pdfcodec.decode_pdfstream_until_unknown pdf (P.lookup_obj pdf n)
|
||
in
|
||
let pairs =
|
||
let ps = ref [] in
|
||
P.objiter
|
||
(fun i pdfobj ->
|
||
ps := (i, json_of_object ~utf8 pdf fcs ~no_stream_data ~parse_content pdfobj)::!ps)
|
||
pdf;
|
||
parameters::trailerdict::sort compare !ps
|
||
in
|
||
let pairs_parsed =
|
||
if not parse_content then pairs else
|
||
map
|
||
(fun (objnum, obj) ->
|
||
if mem objnum !content_streams then
|
||
begin match obj with
|
||
| `Assoc ["S", `List [dict; `String _]] ->
|
||
let streamdata =
|
||
match P.lookup_obj pdf objnum with
|
||
| P.Stream {contents = (_, P.Got b)} -> b
|
||
| _ -> error "JSON: stream not decoded"
|
||
in
|
||
let dict =
|
||
match dict with
|
||
| `Assoc d ->
|
||
`Assoc (option_map (function (("/Filter" | "/Length"), _) -> None | (a, b) -> Some (a, b)) d)
|
||
| _ -> assert false
|
||
in
|
||
(objnum,
|
||
`Assoc ["S", `List [dict; parse_content_stream utf8 pdf (P.Dictionary []) streamdata]])
|
||
| _ -> error "json_of_pdf: stream parsing inconsistency"
|
||
end
|
||
else
|
||
(objnum, obj))
|
||
pairs
|
||
in
|
||
`List
|
||
(map
|
||
(fun (objnum, jsonobj) -> `List [`Int objnum; jsonobj])
|
||
pairs_parsed)
|
||
|
||
let to_output o ~utf8 ~parse_content ~no_stream_data ~decompress_streams ?(clean_strings=false) pdf =
|
||
let json = json_of_pdf ~utf8 ~parse_content ~no_stream_data ~decompress_streams ~clean_strings pdf in
|
||
match o.Pdfio.out_caml_channel with
|
||
| Some ch -> J.pretty_to_channel ch json
|
||
| None -> o.Pdfio.output_string (J.pretty_to_string json)
|
||
|
||
let of_input i =
|
||
try
|
||
match i.Pdfio.caml_channel with
|
||
| Some ch ->
|
||
pdf_of_json (J.from_channel ch)
|
||
| None ->
|
||
let content = Pdfio.string_of_bytes (Pdfio.bytes_of_input i 0 i.Pdfio.in_channel_length) in
|
||
pdf_of_json (J.from_string content)
|
||
with
|
||
e -> error (Printexc.to_string e)
|