/
pdfdest.ml
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/
pdfdest.ml
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(* Read and Write Destinations *)
open Pdfutil
type targetpage =
| PageObject of int
| OtherDocPageNumber of int
type t =
| Action of Pdf.pdfobject
| NullDestination
| NamedDestinationElsewhere of string
| XYZ of targetpage * float option * float option * float option
| Fit of targetpage
| FitH of targetpage * float option
| FitV of targetpage * float option
| FitR of targetpage * float * float * float * float
| FitB of targetpage
| FitBH of targetpage * float option
| FitBV of targetpage * float option
(* Read the destination - it's either direct, or in /Dests in the document
catalog, or in /Dests in the document name tree. *)
let read_targetpage = function
| Pdf.Indirect i -> PageObject i
| Pdf.Integer i -> OtherDocPageNumber i
| _ -> assert false (* ruled out in read_destination *)
let rec read_destination pdf pdfobject =
let option_getnum = function
| Pdf.Null -> None
| x -> Some (Pdf.getnum pdf x)
in
match Pdf.direct pdf pdfobject with
| Pdf.Dictionary d ->
begin
(* We're discarding any other dictionary entries here... *)
match Pdf.lookup_direct pdf "/D" (Pdf.Dictionary d) with
| Some dest -> read_destination pdf dest
| None -> NullDestination
end
| Pdf.Array
[(Pdf.Indirect _ | Pdf.Integer _) as p;
Pdf.Name "/XYZ"; l; t; z] ->
XYZ
(read_targetpage p, option_getnum l, option_getnum t, option_getnum z)
| Pdf.Array (* Read common malformed one. *)
[(Pdf.Indirect _ | Pdf.Integer _) as p;
Pdf.Name "/XYZ"; l; t] ->
XYZ
(read_targetpage p, option_getnum l, option_getnum t, None)
| Pdf.Array (* Read common malformed one. *)
[(Pdf.Indirect _ | Pdf.Integer _) as p;
Pdf.Name "/XYZ"; l] ->
XYZ
(read_targetpage p, option_getnum l, None, None)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p; Pdf.Name "/Fit"] ->
Fit (read_targetpage p)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p; Pdf.Name "/FitH"; t] ->
FitH (read_targetpage p, option_getnum t)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p; Pdf.Name "/FitV"; l] ->
FitV (read_targetpage p, option_getnum l)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p;
Pdf.Name "/FitR"; l; b; r; t] ->
FitR
(read_targetpage p, Pdf.getnum pdf l, Pdf.getnum pdf b,
Pdf.getnum pdf r, Pdf.getnum pdf t)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p; Pdf.Name "/FitB"] ->
FitB (read_targetpage p)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p; Pdf.Name "/FitBH"; t] ->
FitBH (read_targetpage p, option_getnum t)
| Pdf.Array [(Pdf.Indirect _ | Pdf.Integer _) as p; Pdf.Name "/FitBV"; l] ->
FitBV (read_targetpage p, option_getnum l)
| Pdf.Name n ->
begin match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some catalog ->
begin match Pdf.lookup_direct pdf "/Dests" catalog with
| Some dests ->
begin match Pdf.lookup_direct pdf n dests with
| Some dest' -> read_destination pdf dest'
| None -> NamedDestinationElsewhere n
end
| None -> NamedDestinationElsewhere n
end
| None -> raise (Pdf.PDFError "read_destination: no catalog")
end
| Pdf.String s ->
let rootdict = Pdf.lookup_obj pdf pdf.Pdf.root in
begin match Pdf.lookup_direct pdf "/Names" rootdict with
| Some namedict ->
begin match Pdf.lookup_direct pdf "/Dests" namedict with
| Some destsdict ->
begin match
Pdf.nametree_lookup pdf (Pdf.String s) destsdict
with
| None -> NamedDestinationElsewhere s
| Some dest -> read_destination pdf (Pdf.direct pdf dest)
end
| _ -> NamedDestinationElsewhere s
end
| _ -> NamedDestinationElsewhere s
end
| p ->
Pdfe.log (Printf.sprintf "Warning: Could not read destination %s\n" (Pdfwrite.string_of_pdf p));
NullDestination
let pdf_of_targetpage = function
| PageObject i -> Pdf.Indirect i
| OtherDocPageNumber i -> Pdf.Integer i
let pos_null = function
None -> Pdf.Null
| Some x -> Pdf.Real x
let pdfobject_of_destination = function
| Action a -> a
| NullDestination -> Pdf.Null
| NamedDestinationElsewhere s -> Pdf.String s
| XYZ (p, left, top, zoom) ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/XYZ"; pos_null left; pos_null top; pos_null zoom]
| Fit p ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/Fit"]
| FitH (p, top) ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/FitH"; pos_null top]
| FitV (p, left) ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/FitV"; pos_null left]
| FitR (p, left, bottom, right, top) ->
Pdf.Array
[pdf_of_targetpage p; Pdf.Name "/FitR"; Pdf.Real left;
Pdf.Real bottom; Pdf.Real right; Pdf.Real top]
| FitB p ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/FitB"]
| FitBH (p, top) ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/FitBH"; pos_null top]
| FitBV (p, left) ->
Pdf.Array [pdf_of_targetpage p; Pdf.Name "/FitBV"; pos_null left]
(* Transform destinations by a given matrix. Where we have a proper pair making
a point, it is easy. Where we do not, we improvise. It is likely only to be
sensible for scaling / shifting / uprighting anyway. For example, a vertical
flip of a page is hardly likely to make a paragraph come up in the right
position. Careful to preserve nulls, and handle all combinations. *)
(* Acrobat doesn't like /OpenActions (at least) which contain numbers outside
the float range -32768...32768. This is the old (pre-ISO) float range. *)
let clip_pair (a, b) =
let clip f =
if f < -32768.0 then -32768.0 else
if f > 32768.0 then 32768.0 else f
in
(clip a, clip b)
let transform_destination t = function
| FitH (PageObject _ as p, Some top) ->
let (_, top) = clip_pair (Pdftransform.transform_matrix t (0., top)) in
FitH (p, Some top)
| FitV (PageObject _ as p, Some left) ->
let (left, _) = clip_pair (Pdftransform.transform_matrix t (left, 0.)) in
FitV (p, Some left)
| FitBH (PageObject _ as p, Some top) ->
let (_, top) = clip_pair (Pdftransform.transform_matrix t (0., top)) in
FitBH (p, Some top)
| FitBV (PageObject _ as p, Some left) ->
let (left, _) = clip_pair (Pdftransform.transform_matrix t (left, 0.)) in
FitBV (p, Some left)
| XYZ (PageObject _ as p, Some left, Some top, zoom) ->
let left, top = clip_pair (Pdftransform.transform_matrix t (left, top)) in
XYZ (p, Some left, Some top, zoom)
| XYZ (PageObject _ as p, None, Some top, zoom) ->
let _, top = clip_pair (Pdftransform.transform_matrix t (0., top)) in
XYZ (p, None, Some top, zoom)
| XYZ (PageObject _ as p, Some left, None, zoom) ->
let left, _ = clip_pair (Pdftransform.transform_matrix t (left, 0.)) in
XYZ (p, Some left, None, zoom)
| FitR (PageObject _ as p, left, bottom, right, top) ->
let left, top = clip_pair (Pdftransform.transform_matrix t (left, top)) in
let right, bottom = clip_pair (Pdftransform.transform_matrix t (right, bottom)) in
FitR (p, left, bottom, right, top)
| x -> x