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cpdf-source
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cpdf-source/cpdf.ml

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(* CPDF Core routines *)
open Pdfutil
open Pdfio
let debug = ref false
(* For debugging *)
let report_pdf_size pdf =
Pdf.remove_unreferenced pdf;
Pdfwrite.pdf_to_file_options ~preserve_objstm:false ~generate_objstm:false
~compress_objstm:false false None false pdf "temp.pdf";
let fh = open_in_bin "temp.pdf" in
Printf.printf "Size %i bytes\n" (in_channel_length fh);
flush stdout;
close_in fh
(* Prefer a) the one given with -cpdflin b) a local cpdflin, c) otherwise assume
installed at a system place *)
let find_cpdflin provided =
match provided with
Some x -> x
| None ->
let dotslash = match Sys.os_type with "Win32" -> "" | _ -> "./" in
if Sys.file_exists "cpdflin" then (dotslash ^ "cpdflin") else
if Sys.file_exists "cpdflin.exe" then (dotslash ^ "cpdflin.exe") else
match Sys.os_type with
"Win32" -> "cpdflin.exe"
| _ -> "cpdflin"
(* Call cpdflin, given the (temp) input name, the output name, and the location
of the cpdflin binary. Returns the exit code. *)
let call_cpdflin cpdflin temp output best_password =
let command =
cpdflin ^ " --linearize " ^ " --password=" ^ best_password ^ " " ^
Filename.quote temp ^ " " ^ Filename.quote output
in
match Sys.os_type with
"Win32" ->
(* On windows, don't use LD_LIBRARY_PATH - it will happen automatically *)
if !debug then prerr_endline command;
Sys.command command
| _ ->
(* On other platforms, if -cpdflin was provided, or cpdflin was in the
current folder, set up LD_LIBRARY_PATH: *)
match cpdflin with
"cpdflin" ->
if !debug then prerr_endline command;
Sys.command command
| _ ->
let command =
"DYLD_FALLBACK_LIBRARY_PATH=" ^ Filename.dirname cpdflin ^ " " ^
"LD_LIBRARY_PATH=" ^ Filename.dirname cpdflin ^ " " ^
command
in
if !debug then prerr_endline command;
Sys.command command
(* Recompress anything which isn't compressed, unless it's metadata. *)
let recompress_stream pdf = function
(* If there is no compression, compress with /FlateDecode *)
| Pdf.Stream {contents = (dict, _)} as stream ->
begin match
Pdf.lookup_direct pdf "/Filter" dict,
Pdf.lookup_direct pdf "/Type" dict
with
| _, Some (Pdf.Name "/Metadata") -> ()
| (None | Some (Pdf.Array [])), _ ->
Pdfcodec.encode_pdfstream pdf Pdfcodec.Flate stream
| _ -> ()
end
| _ -> assert false
let recompress_pdf pdf =
if not (Pdfcrypt.is_encrypted pdf) then
Pdf.iter_stream (recompress_stream pdf) pdf;
pdf
let decompress_pdf pdf =
if not (Pdfcrypt.is_encrypted pdf) then
(Pdf.iter_stream (Pdfcodec.decode_pdfstream_until_unknown pdf) pdf);
pdf
(* Equality on PDF objects *)
let pdfobjeq pdf x y =
let x = Pdf.lookup_obj pdf x
and y = Pdf.lookup_obj pdf y in
begin match x with Pdf.Stream _ -> Pdf.getstream x | _ -> () end;
begin match y with Pdf.Stream _ -> Pdf.getstream y | _ -> () end;
compare x y
let really_squeeze pdf =
let objs = ref [] in
Pdf.objiter (fun objnum _ -> objs := objnum :: !objs) pdf;
let toprocess =
keep
(fun x -> length x > 1)
(collate (pdfobjeq pdf) (sort (pdfobjeq pdf) !objs))
in
(* Remove any pools of objects which are page objects, since Adobe Reader
* gets confused when there are duplicate page objects. *)
let toprocess =
option_map
(function
[] -> assert false
| h::_ as l ->
match Pdf.lookup_direct pdf "/Type" (Pdf.lookup_obj pdf h) with
Some (Pdf.Name "/Page") -> None
| _ -> Some l)
toprocess
in
let pdfr = ref pdf in
let changetable = Hashtbl.create 100 in
iter
(function [] -> assert false | h::t ->
iter (fun e -> Hashtbl.add changetable e h) t)
toprocess;
(* For a unknown reason, the output file is much smaller if
Pdf.renumber is run twice. This is bizarre, since Pdf.renumber is
an old, well-understood function in use for years -- what is
going on? Furthermore, if we run it 3 times, it gets bigger again! *)
pdfr := Pdf.renumber changetable !pdfr;
pdfr := Pdf.renumber changetable !pdfr;
Pdf.remove_unreferenced !pdfr;
pdf.Pdf.root <- !pdfr.Pdf.root;
pdf.Pdf.objects <- !pdfr.Pdf.objects;
pdf.Pdf.trailerdict <- !pdfr.Pdf.trailerdict
(* Squeeze the form xobject at objnum.
FIXME: For old PDFs (< v1.2) any resources from the page (or its ancestors in
the page tree!) are also needed - we must merge them with the ones from the
xobject itself. However, it it safe for now -- in the unlikely event that the
resources actually need to be available, the parse will fail, the squeeze of
this object will fail, and we bail out. *)
let xobjects_done = ref []
let squeeze_form_xobject pdf objnum =
if mem objnum !xobjects_done then () else
xobjects_done := objnum :: !xobjects_done;
let obj = Pdf.lookup_obj pdf objnum in
match Pdf.lookup_direct pdf "/Subtype" obj with
Some (Pdf.Name "/Form") ->
let resources =
match Pdf.lookup_direct pdf "/Resources" obj with
Some d -> d
| None -> Pdf.Dictionary []
in
begin match
Pdfops.stream_of_ops
(Pdfops.parse_operators pdf resources [Pdf.Indirect objnum])
with
Pdf.Stream {contents = (_, Pdf.Got data)} ->
(* Put replacement data in original stream, and overwrite /Length *)
begin match obj with
Pdf.Stream ({contents = (d, _)} as str) ->
str :=
(Pdf.add_dict_entry d "/Length" (Pdf.Integer (bytes_size data)),
Pdf.Got data)
| _ -> failwith "squeeze_form_xobject"
end
| _ -> failwith "squeeze_form_xobject"
end
| _ -> ()
(* For a list of indirects representing content streams, make sure that none of
them are duplicated in the PDF. This indicates sharing, which parsing and
rewriting the streams might destroy, thus making the file bigger. FIXME: The
correct thing to do is to preserve the multiple content streams. *)
let no_duplicates content_stream_numbers stream_numbers =
not
(mem false
(map
(fun n -> length (keep (eq n) content_stream_numbers) < 2)
stream_numbers))
(* Give a list of content stream numbers, given a page reference number *)
let content_streams_of_page pdf refnum =
match Pdf.direct pdf (Pdf.lookup_obj pdf refnum) with
Pdf.Dictionary dict ->
begin match lookup "/Contents" dict with
Some (Pdf.Indirect i) -> [i]
| Some (Pdf.Array x) ->
option_map (function Pdf.Indirect i -> Some i | _ -> None) x
| _ -> []
end
| _ -> []
(* For each object in the PDF marked with /Type /Page, for each /Contents
indirect reference or array of such, decode and recode that content stream. *)
let squeeze_all_content_streams pdf =
let page_reference_numbers = Pdf.page_reference_numbers pdf in
let all_content_streams_in_doc =
flatten (map (content_streams_of_page pdf) page_reference_numbers)
in
xobjects_done := [];
Pdf.objiter
(fun objnum _ ->
match Pdf.lookup_obj pdf objnum with
Pdf.Dictionary dict as d
when
Pdf.lookup_direct pdf "/Type" d = Some (Pdf.Name "/Page")
->
let resources =
match Pdf.lookup_direct pdf "/Resources" d with
Some d -> d
| None -> Pdf.Dictionary []
in
begin try
let content_streams =
match lookup "/Contents" dict with
Some (Pdf.Indirect i) ->
begin match Pdf.direct pdf (Pdf.Indirect i) with
Pdf.Array x -> x
| _ -> [Pdf.Indirect i]
end
| Some (Pdf.Array x) -> x
| _ -> raise Not_found
in
if
no_duplicates
all_content_streams_in_doc
(map (function Pdf.Indirect i -> i | _ -> assert false) content_streams)
then
let newstream =
Pdfops.stream_of_ops
(Pdfops.parse_operators pdf resources content_streams)
in
let newdict =
Pdf.add_dict_entry
d "/Contents" (Pdf.Indirect (Pdf.addobj pdf newstream))
in
Pdf.addobj_given_num pdf (objnum, newdict);
(* Now process all xobjects related to this page *)
begin match Pdf.lookup_direct pdf "/XObject" resources with
Some (Pdf.Dictionary xobjs) ->
iter
(function
(_, Pdf.Indirect i) -> squeeze_form_xobject pdf i
| _ -> failwith "squeeze_xobject")
xobjs
| _ -> ()
end
with
(* No /Contents, which is ok. Or a parsing failure due to
uninherited resources. FIXME: Add support for inherited
resources. *)
Not_found -> ()
end
| _ -> ())
pdf
(* We run squeeze enough times to reach a fixed point in the cardinality of the
* object map *)
let squeeze ?logto pdf =
let log x =
match logto with
None -> print_string x; flush stdout
| Some "nolog" -> ()
| Some s ->
let fh = open_out_gen [Open_wronly; Open_creat] 0o666 s in
seek_out fh (out_channel_length fh);
output_string fh x;
close_out fh
in
try
let n = ref (Pdf.objcard pdf) in
log (Printf.sprintf "Beginning squeeze: %i objects\n" (Pdf.objcard pdf));
while !n > (ignore (really_squeeze pdf); Pdf.objcard pdf) do
n := Pdf.objcard pdf;
log (Printf.sprintf "Squeezing... Down to %i objects\n" (Pdf.objcard pdf));
done;
log (Printf.sprintf "Squeezing page data and xobjects\n");
squeeze_all_content_streams pdf;
log (Printf.sprintf "Recompressing document\n");
Pdfcodec.flate_level := 9;
ignore (recompress_pdf pdf)
with
e ->
raise
(Pdf.PDFError
(Printf.sprintf
"Squeeze failed. No output written.\n Proximate error was:\n %s"
(Printexc.to_string e)))
type encoding =
| Raw
| UTF8
| Stripped
(* Just strip everything which isn't 7 bit ASCII *)
let crude_de_unicode s =
implode (map char_of_int (lose (fun x -> x > 127) (Pdftext.codepoints_of_pdfdocstring s)))
let encode_output enc s =
match enc with
| Raw -> s
| UTF8 -> Pdftext.utf8_of_pdfdocstring s
| Stripped -> crude_de_unicode s
(* Get the number of pages in file. Doesn't need decryption. *)
let endpage_io ?revision i user_pw owner_pw =
let pdf = Pdfread.pdf_of_input_lazy ?revision user_pw owner_pw i in
Pdfpage.endpage pdf
(* Raised when syntax is ok, but endpage is too low. Caught by validator.
Caught and reraised as normal failure by parse_pagespec. *)
exception PageSpecUnknownPage of int
(* There would be no pages *)
exception PageSpecWouldBeNoPages
(* Raised when syntax is wrong. Caught and reraised by parse_pagespec and
validator. *)
exception PageSpecBadSyntax
(* Parsing range specifications *)
let rec splitat_commas toks =
match cleavewhile (neq (Pdfgenlex.LexName ",")) toks with
| [], [] -> []
| [], _ -> raise PageSpecBadSyntax
| some, [] -> [some]
| _::_ as before, _::rest -> before::splitat_commas rest
let is_dimension comparison {Pdfpage.mediabox = box} =
let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
comparison (maxx -. minx) (maxy -. miny)
let select_dimensions comparison pdf candidates =
let pages = Pdfpage.pages_of_pagetree pdf in
let pagenums, kept_pages =
split
(option_map
(fun (index, page) ->
if mem index candidates then Some (index, page) else None)
(combine (indx pages) pages))
in
option_map2
(fun pagenum page ->
if is_dimension comparison page then Some pagenum else None)
pagenums
kept_pages
let select_portrait = select_dimensions ( < )
let select_landscape = select_dimensions ( > )
let rec mk_numbers pdf endpage lexemes =
match lexemes with
| [Pdfgenlex.LexInt n] -> [n]
| [Pdfgenlex.LexName "end"] -> [endpage]
| [Pdfgenlex.LexInt n; Pdfgenlex.LexName "-"; Pdfgenlex.LexInt n'] ->
if n > n' then rev (ilist n' n) else ilist n n'
| [Pdfgenlex.LexName "end"; Pdfgenlex.LexName "-"; Pdfgenlex.LexInt n] ->
if n <= endpage
then rev (ilist n endpage)
else raise (PageSpecUnknownPage n)
| [Pdfgenlex.LexInt n; Pdfgenlex.LexName "-"; Pdfgenlex.LexName "end"] ->
if n <= endpage
then ilist n endpage
else raise (PageSpecUnknownPage n)
| [Pdfgenlex.LexName "end"; Pdfgenlex.LexName "-"; Pdfgenlex.LexName "end"] ->
[endpage]
| [Pdfgenlex.LexName "even"] ->
drop_odds (ilist 1 endpage)
| [Pdfgenlex.LexName "portrait"] ->
select_portrait pdf (ilist 1 endpage)
| [Pdfgenlex.LexName "landscape"] ->
select_landscape pdf (ilist 1 endpage)
| [Pdfgenlex.LexName "odd"] ->
really_drop_evens (ilist 1 endpage)
| [Pdfgenlex.LexName "all"] ->
ilist 1 endpage
| [Pdfgenlex.LexName "reverse"] ->
rev (ilist 1 endpage)
| toks ->
let ranges = splitat_commas toks in
if ranges = [toks] then raise PageSpecBadSyntax else
flatten (map (mk_numbers pdf endpage) ranges)
(* Space dashes and commas *)
let rec add_spaces = function
| [] -> []
| ('-' | ',') as h::t -> ' '::h::' '::add_spaces t
| h::t -> h::add_spaces t
let space_string s =
implode (add_spaces (explode s))
let fixup_negatives endpage = function
| Pdfgenlex.LexName s when String.length s > 1 && s.[0] = '~' ->
Pdfgenlex.LexInt (endpage + 1 + ~-(int_of_string (implode (tl (explode s)))))
| x -> x
let parse_pagespec_inner endpage pdf spec =
let spec = space_string spec in
if endpage < 1 then raise (Pdf.PDFError "This PDF file has no pages and is therefore malformed") else
let numbers =
try
match rev (explode spec) with
| ['n'; 'e'; 'v'; 'e'] ->
keep even (ilist 1 endpage)
| ['d'; 'd'; 'o'] ->
keep odd (ilist 1 endpage)
| ['t'; 'i'; 'a'; 'r'; 't'; 'r'; 'o'; 'p'] ->
select_portrait pdf (ilist 1 endpage)
| ['e'; 'p'; 'a'; 'c'; 's'; 'd'; 'n'; 'a'; 'l'] ->
select_landscape pdf (ilist 1 endpage)
| 't'::'i'::'a'::'r'::'t'::'r'::'o'::'p'::more ->
select_portrait
pdf
(mk_numbers pdf endpage (map (fixup_negatives endpage) (Pdfgenlex.lex_string (implode (rev more)))))
| 'e'::'p'::'a'::'c'::'s'::'d'::'n'::'a'::'l'::more ->
select_landscape
pdf
(mk_numbers pdf endpage (map (fixup_negatives endpage) (Pdfgenlex.lex_string (implode (rev more)))))
| 'd'::'d'::'o'::more ->
keep
odd
(mk_numbers pdf endpage (map (fixup_negatives endpage) (Pdfgenlex.lex_string (implode (rev more)))))
| 'n'::'e'::'v'::'e'::more ->
keep
even
(mk_numbers pdf endpage (map (fixup_negatives endpage) (Pdfgenlex.lex_string (implode (rev more)))))
| _ ->
mk_numbers pdf endpage (map (fixup_negatives endpage) (Pdfgenlex.lex_string spec))
with
e -> raise PageSpecBadSyntax
in
if numbers = [] then raise PageSpecWouldBeNoPages else
iter
(fun n ->
if n <= 0 || n > endpage then raise (PageSpecUnknownPage n))
numbers;
numbers
let parse_pagespec pdf spec =
try parse_pagespec_inner (Pdfpage.endpage pdf) pdf spec with
| PageSpecUnknownPage n ->
raise (Pdf.PDFError ("Page " ^ string_of_int n ^ " does not exist."))
| PageSpecWouldBeNoPages ->
raise (Pdf.PDFError ("Page range specifies no pages"))
| e ->
raise
(Pdf.PDFError
("Bad page specification " ^ spec ^
". Raw error was " ^ Printexc.to_string e ^
". Last page was " ^ string_of_int (Pdfpage.endpage pdf)))
(* To validate a pagespec as being syntactically correct without the PDF in
question. This is nasty, since the parser above includes checking based on the
endpage of the PDF (which we don't have). Pass 100 as the endpage, doubling on
page range exception, bailng out above 500000. *)
let rec validate_pagespec_inner n spec =
try
ignore (parse_pagespec_inner n (Pdf.empty ()) spec); true
with
| PageSpecUnknownPage _ -> if n < 500000 then validate_pagespec_inner (n * 2) spec else false
| PageSpecBadSyntax | _ -> false
let validate_pagespec spec =
validate_pagespec_inner 100 spec
let rec parse_pagespec_without_pdf_inner n spec =
try
parse_pagespec_inner n (Pdf.empty ()) spec
with
PageSpecUnknownPage _ ->
if n < 500000
then parse_pagespec_without_pdf_inner (n * 2) spec
else raise (Pdf.PDFError "PageSpecUnknownPage")
let parse_pagespec_without_pdf spec =
parse_pagespec_without_pdf_inner 100 spec
(* Convert an integer list representing a set to a page specification, in order. *)
let string_of_pagespec pdf = function
| [] -> ""
| is ->
let iseven len is =
drop_odds (ilist 1 len) = is
in let isodd len is =
really_drop_evens (ilist 1 len) = is
in let isall len is =
ilist 1 len = is
in let is = sort compare is
in let len = Pdfpage.endpage pdf in
let rec mkranges prev = function
| [] -> map extremes (rev (map rev prev))
| h::t ->
match prev with
| (ph::pht)::pt when h = ph + 1 -> mkranges ((h::ph::pht)::pt) t
| (_::_)::_ -> mkranges ([h]::prev) t
| []::_ -> assert false
| [] -> mkranges [[h]] t
in
if iseven len is && len > 3 then "even" else
if isodd len is && len > 2 then "odd" else
if isall len is then "all" else
let ranges = mkranges [] is in
let rangestrings =
map
(function (s, e) ->
if s = e
then string_of_int s
else string_of_int s ^ "-" ^ string_of_int e)
ranges
in
fold_left ( ^ ) "" (interleave "," rangestrings)
let string_of_range r =
fold_left (fun a b -> a ^ " " ^ b) "" (map string_of_int r)
let print_pdf_objs pdf =
Printf.printf "Trailerdict: %s\n" (Pdfwrite.string_of_pdf pdf.Pdf.trailerdict);
Printf.printf "Root: %i\n" pdf.Pdf.root;
begin match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some catalog ->
Printf.printf "Catalog: %s\n" (Pdfwrite.string_of_pdf catalog);
begin match Pdf.lookup_direct pdf "/Pages" catalog with
| Some pages ->
Printf.printf "Pages: %s\n" (Pdfwrite.string_of_pdf pages)
| None ->
flprint "no catalog\n"
end
| None ->
flprint "No catalog!\n"
end;
Pdf.objiter
(fun n obj ->
Printf.printf "%i 0 obj:\n\n" n;
Printf.printf "%s\n" (Pdfwrite.string_of_pdf obj))
pdf
(* Return page label at pdf page num, or page number in arabic if no label *)
let pagelabel pdf num =
Pdfpagelabels.pagelabeltext_of_pagenumber
num
(Pdfpagelabels.complete (Pdfpagelabels.read pdf))
let rec process_text text m =
match m with
| [] -> Cpdfstrftime.strftime text
| (s, r)::t -> process_text (string_replace_all_lazy s r text) t
let expand_date = function
| "now" -> Cpdfstrftime.strftime "D:%Y%m%d%H%M%S"
| x -> x
let process_pages f pdf range =
let pages = Pdfpage.pages_of_pagetree pdf in
let pages' =
map2
(fun n p -> if mem n range then f n p else p)
(ilist 1 (length pages))
pages
in
Pdfpage.change_pages true pdf pages'
let iter_pages f pdf range =
let pages = Pdfpage.pages_of_pagetree pdf in
iter2
(fun n p -> if mem n range then f n p)
(ilist 1 (length pages))
pages
let map_pages f pdf range =
let pages = Pdfpage.pages_of_pagetree pdf in
option_map2
(fun n p -> if mem n range then Some (f n p) else None)
(ilist 1 (length pages))
pages
(* Add stack operators to a content stream to ensure it is composeable. On
-fast, we don't check for Q deficit, assuming PDF is ISO. *)
let protect fast pdf resources content =
let deficit =
if fast then 0 else
let ops = Pdfops.parse_operators pdf resources content in
let qs = length (keep (eq Pdfops.Op_q) ops) in
let bigqs = length (keep (eq Pdfops.Op_Q) ops) in
let deficit = if qs > bigqs then qs - bigqs else 0 in
if deficit <> 0 then Printf.eprintf "Q Deficit was nonzero. Fixing. %i\n" deficit;
deficit
in
let addstream ops = Pdf.addobj pdf (Pdfops.stream_of_ops ops) in
let q = addstream [Pdfops.Op_q] in
let qs = addstream (many Pdfops.Op_Q deficit @ [Pdfops.Op_Q]) in
[Pdf.Indirect q] @ content @ [Pdf.Indirect qs]
exception SoftError of string
let error s = raise (SoftError s)
exception HardError of string
(* Union two resource dictionaries from the same PDF. *)
let combine_pdf_resources pdf a b =
let a_entries =
match a with
| Pdf.Dictionary entries -> entries
| _ -> []
in let b_entries =
match b with
| Pdf.Dictionary entries -> entries
| _ -> []
in
let resource_keys =
["/Font"; "/ExtGState"; "/ColorSpace"; "/Pattern";
"/Shading"; "/XObject"; "/Properties"]
in
let combine_entries key =
let a_entries =
match Pdf.lookup_direct pdf key a with
| Some (Pdf.Dictionary d) -> d
| _ -> []
in let b_entries =
match Pdf.lookup_direct pdf key b with
| Some (Pdf.Dictionary d) -> d
| _ -> []
in
if a_entries = [] && b_entries = [] then
None
else
Some (key, Pdf.Dictionary (a_entries @ b_entries))
in
let unknown_keys_a = lose (fun (k, _) -> mem k resource_keys) a_entries in
let unknown_keys_b = lose (fun (k, _) -> mem k resource_keys) b_entries in
let combined_known_entries = option_map combine_entries resource_keys in
Pdf.Dictionary (unknown_keys_a @ unknown_keys_b @ combined_known_entries)
(* \section{Build PDF Presentations} *)
let change_page_effect t d horizontal inward direction effect_duration page =
let checkname = function
| "Split" | "Blinds" | "Box" | "Wipe" | "Dissolve" | "Glitter" -> ()
| _ -> error "Unknown presentation type"
in
let rest = page.Pdfpage.rest in
let transdict =
match t with
| None ->
Pdf.Dictionary []
| Some name ->
checkname name;
Pdf.Dictionary [("/S", Pdf.Name ("/" ^ name))]
in
let transdict = Pdf.add_dict_entry transdict "/D" (Pdf.Real effect_duration) in
let transdict =
match t with
| Some ("Split" | "Blinds") ->
Pdf.add_dict_entry
transdict "/Dm" (Pdf.Name (if horizontal then "/H" else "/V"))
| _ -> transdict
in
let transdict =
match t with
| Some ("Split" | "Box") ->
Pdf.add_dict_entry
transdict "/M" (Pdf.Name (if inward then "/I" else "/O"))
| _ -> transdict
in
let transdict =
match t with
| Some ("Wipe" | "Glitter") ->
Pdf.add_dict_entry transdict "/Di" (Pdf.Integer direction)
| _ -> transdict
in
let rest = Pdf.add_dict_entry rest "/Trans" transdict in
let rest =
match d with
| None -> Pdf.remove_dict_entry rest "/Dur"
| Some delay -> Pdf.add_dict_entry rest "/Dur" (Pdf.Real delay)
in
{page with Pdfpage.rest = rest}
let presentation range t d h i dir effect_dur pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
let pages' =
map2
(fun page num ->
if mem num range
then change_page_effect t d h i dir effect_dur page
else page)
pages
(indx pages)
in
Pdfpage.change_pages true pdf pages'
(* Attaching files *)
let attach_file ?memory keepversion topage pdf file =
let data =
match memory with
Some data -> data
| None ->
let ch = open_in_bin file in
let len = in_channel_length ch in
let stream = mkbytes len in
let i = input_of_channel ch in
setinit i stream 0 len;
close_in ch;
stream
in
let filestream =
Pdf.Stream
(ref (Pdf.Dictionary
[("/Length", Pdf.Integer (bytes_size data));
("/Type", Pdf.Name "/EmbeddedFile");
("/Params",
Pdf.Dictionary
[("/Size", Pdf.Integer (bytes_size data));
("/CheckSum", Pdf.String (Digest.string (string_of_bytes data)))
])],
Pdf.Got data))
in
let filestream_num = Pdf.addobj pdf filestream in
let filespec =
Pdf.Dictionary
[("/EF", Pdf.Dictionary ["/F", Pdf.Indirect filestream_num]);
("/F", Pdf.String (Filename.basename file));
("/Type", Pdf.Name "/Filespec");
("/Desc", Pdf.String "");
("/UF", Pdf.String (Filename.basename file))]
in
match topage with
| None ->
(* Look up /Names and /EmbeddedFiles and /Names. *)
let rootdict = Pdf.lookup_obj pdf pdf.Pdf.root in
let namedict =
match Pdf.lookup_direct pdf "/Names" rootdict with
| None -> Pdf.Dictionary []
| Some namedict -> namedict
in
let embeddednamedict =
match Pdf.lookup_direct pdf "/EmbeddedFiles" namedict with
| None -> Pdf.Dictionary []
| Some embeddednamedict -> embeddednamedict
in
let elts =
match Pdf.lookup_direct pdf "/Names" embeddednamedict with
| Some (Pdf.Array elts) -> elts
| _ -> []
in
let filespecobj = Pdf.addobj pdf filespec in
let names' = Pdf.Array (elts @ [Pdf.String (Filename.basename file); Pdf.Indirect filespecobj]) in
let embeddednamedict' = Pdf.add_dict_entry embeddednamedict "/Names" names' in
let namedict' = Pdf.add_dict_entry namedict "/EmbeddedFiles" embeddednamedict' in
let rootdict' = Pdf.add_dict_entry rootdict "/Names" namedict' in
let rootnum = Pdf.addobj pdf rootdict' in
{pdf with
Pdf.minor = if keepversion then pdf.Pdf.minor else max pdf.Pdf.minor 4;
Pdf.root = rootnum;
Pdf.trailerdict =
Pdf.add_dict_entry
pdf.Pdf.trailerdict "/Root" (Pdf.Indirect rootnum)}
| Some pagenumber ->
let pages = Pdfpage.pages_of_pagetree pdf in
if pagenumber < 0 || pagenumber > length pages then error "attach_file: Page not found" else
let page = select pagenumber pages in
let annots =
match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array annots) -> annots
| _ -> []
in
let rect =
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
Pdf.Array [Pdf.Real 18.; Pdf.Real (maxy -. 45.); Pdf.Real 45.; Pdf.Real (maxy -. 18.)]
in
let filespecobj = Pdf.addobj pdf filespec in
let annot =
Pdf.Dictionary
[("/FS", Pdf.Indirect filespecobj);
("/Subtype", Pdf.Name "/FileAttachment");
("/Contents", Pdf.String (Filename.basename file));
("/Rect", rect)]
in
let annots' = Pdf.Array (annot::annots) in
let page' =
{page with Pdfpage.rest = Pdf.add_dict_entry page.Pdfpage.rest "/Annots" annots'}
in
let pages' = replace_number pagenumber page' pages in
let pdf = Pdfpage.change_pages true pdf pages' in
{pdf with
Pdf.minor = if keepversion then pdf.Pdf.minor else max pdf.Pdf.minor 4}
type attachment =
{name : string;
pagenumber : int;
data : unit -> Pdfio.bytes}
let list_attached_files pdf =
let toplevel =
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| None -> []
| Some rootdict ->
match Pdf.lookup_direct pdf "/Names" rootdict with
| None -> []
| Some namedict ->
match Pdf.lookup_direct pdf "/EmbeddedFiles" namedict with
| Some nametree ->
map
(function (x, ef) ->
match Pdf.lookup_direct pdf "/EF" ef with
| Some ((Pdf.Dictionary _) as d) ->
begin match Pdf.lookup_direct pdf "/F" d with
| Some stream ->
{name = x;
pagenumber = 0;
data =
(fun () ->
try
Pdf.getstream stream;
Pdfcodec.decode_pdfstream pdf stream;
match stream with
Pdf.Stream {contents = (_, Pdf.Got data)} -> data
| _ -> raise Not_found
with
_ -> raise (Pdf.PDFError "could not retreive attachment data"))}
| None -> raise (Pdf.PDFError "/F not found")
end
| _ -> raise (Pdf.PDFError "/EF not found"))
(option_map
(function (Pdf.String s, ef) -> Some (s, ef) | _ -> None)
(Pdf.contents_of_nametree pdf nametree))
| _ -> []
in let pagelevel =
let pages = Pdfpage.pages_of_pagetree pdf in
flatten
(map2
(fun page pagenumber ->
option_map
(function annot ->
match Pdf.lookup_direct pdf "/Subtype" annot with
| Some (Pdf.Name "/FileAttachment") ->
(match Pdf.lookup_direct pdf "/Contents" annot with
| Some (Pdf.String s) ->
begin match Pdf.lookup_direct pdf "/FS" annot with
| Some ((Pdf.Dictionary _) as d) ->
Printf.eprintf "%s\n" (Pdfwrite.string_of_pdf d);
begin match Pdf.lookup_direct pdf "/EF" d with
| Some ((Pdf.Dictionary _) as d) ->
begin match Pdf.lookup_direct pdf "/F" d with
| Some stream ->
Some
{name = s;
pagenumber;
data =
(fun () ->
try
Pdf.getstream stream;
Pdfcodec.decode_pdfstream pdf stream;
match stream with
Pdf.Stream {contents = (_, Pdf.Got data)} -> data
| _ -> raise Not_found
with
_ -> raise (Pdf.PDFError "could not retreive attachment data"))}
| _ -> raise (Pdf.PDFError "no /F found in attachment")
end
| _ ->
Some
{name = s;
pagenumber;
data = (fun () -> raise (Pdf.PDFError "no attachment data"))}
end
| _ -> None
end
| _ -> None)
| _ -> None)
(match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array annots) -> annots
| _ -> []))
pages
(indx pages))
in
toplevel @ pagelevel
(* \section{Remove Attached files} *)
let remove_attached_files_on_pages pdf =
let remove_from_page page =
{page with Pdfpage.rest =
Pdf.add_dict_entry page.Pdfpage.rest "/Annots"
(Pdf.Array
(option_map
(function annot ->
match Pdf.lookup_direct pdf "/Subtype" annot with
| Some (Pdf.Name "/FileAttachment") -> None
| _ -> Some annot)
(match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array annots) -> annots
| _ -> [])))}
in
Pdfpage.change_pages true pdf (map remove_from_page (Pdfpage.pages_of_pagetree pdf))
let remove_attached_files pdf =
let pdf = remove_attached_files_on_pages pdf in
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| None -> pdf
| Some rootdict ->
match Pdf.lookup_direct pdf "/Names" rootdict with
| None -> pdf
| Some namedict ->
let namedict' = Pdf.remove_dict_entry namedict "/EmbeddedFiles" in
let rootdict' = Pdf.add_dict_entry rootdict "/Names" namedict' in
let rootdict'num = Pdf.addobj pdf rootdict' in
{pdf with
Pdf.root =
rootdict'num;
Pdf.trailerdict =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect rootdict'num)}
(* \section{Copy an /ID from one file to another} *)
let copy_id keepversion copyfrom copyto =
match Pdf.lookup_direct copyfrom "/ID" copyfrom.Pdf.trailerdict with
| None -> copyto (* error "Source PDF file has no /ID entry to copy from" *)
| Some id ->
copyto.Pdf.trailerdict <-
Pdf.add_dict_entry copyto.Pdf.trailerdict "/ID" id;
copyto.Pdf.minor <-
if keepversion then copyto.Pdf.minor else max copyto.Pdf.minor 1;
copyto
(* \section{Remove bookmarks} *)
(* \section{Add bookmarks} *)
let read_lines input =
let lines = ref [] in
try
while true do
let c = read_line input in
lines =| c
done; []
with
_ -> rev !lines
(* Verify a list of bookmarks. Positive jumps of > 1 not allowed, no numbers
smaller than 0. *)
let rec verify_bookmarks pdf lastlevel endpage = function
| [] -> true
| {Pdfmarks.level = level; Pdfmarks.target = target}::more ->
let page = Pdfpage.pagenumber_of_target pdf target in
level < lastlevel + 2 &&
level >= 0 &&
page <= endpage &&
page >= 0 &&
verify_bookmarks pdf level endpage more
(* Parse a line of the bookmarks file. *)
(* Un-escape things which are escaped. Quotes, newlines and backslashes *)
let rec fixup_characters prev = function
| [] -> rev prev
| '\\'::'\\'::t -> fixup_characters ('\\'::prev) t
| '\\'::'\"'::t -> fixup_characters ('\"'::prev) t
| '\\'::'\n'::t -> fixup_characters ('\n'::prev) t
| h::t -> fixup_characters (h::prev) t
let parse_bookmark_file verify pdf input =
let currline = ref 0 in
try
let lines = Pdfio.read_lines input in
(*i Printf.printf "Read %i lines\n" (length lines);
iter (function x -> Printf.printf "%s\n" x) lines; i*)
let currline = ref 0 in
let bookmarks = ref [] in
iter
(function line ->
match
incr currline;
Pdfgenlex.lex_string line
with
| [Pdfgenlex.LexInt i; Pdfgenlex.LexString s; Pdfgenlex.LexInt i'; Pdfgenlex.LexName "open"] ->
bookmarks =|
{Pdfmarks.level = i;
Pdfmarks.text = Pdftext.pdfdocstring_of_utf8 (implode (fixup_characters [] (explode s)));
Pdfmarks.target = Pdfpage.target_of_pagenumber pdf i';
Pdfmarks.isopen = true}
| [Pdfgenlex.LexInt i; Pdfgenlex.LexString s; Pdfgenlex.LexInt i'; Pdfgenlex.LexName "closed"]
| [Pdfgenlex.LexInt i; Pdfgenlex.LexString s; Pdfgenlex.LexInt i'] ->
bookmarks =|
{Pdfmarks.level = i;
Pdfmarks.text = Pdftext.pdfdocstring_of_utf8 (implode (fixup_characters [] (explode s)));
Pdfmarks.target = Pdfpage.target_of_pagenumber pdf i';
Pdfmarks.isopen = false}
| [] -> () (* ignore blank lines *)
| _ ->
error ("Bad bookmark file, line " ^ (string_of_int !currline)))
lines;
let bookmarks = rev !bookmarks in
if verify then
if verify_bookmarks pdf 0 (Pdfpage.endpage pdf) bookmarks
then bookmarks
else
error
"Bad bookmark file (References non-existant pages or is malformed)"
else
bookmarks
with
_ -> error (Printf.sprintf "Bad bookmark file (syntax) at line %i" !currline)
let add_bookmarks verify input pdf =
let parsed = parse_bookmark_file verify pdf input in
(*iter (fun b -> flprint (Pdfmarks.string_of_bookmark b); flprint "\n") parsed;*)
Pdfmarks.add_bookmarks parsed pdf
(* \section{Set page mode} *)
let set_page_mode pdf s =
match s with
| "UseNone" | "UseOutlines" | "UseThumbs"
| "FullScreen" | "UseOC" | "UseAttachments" ->
begin match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some catalog ->
let catalog' =
Pdf.add_dict_entry catalog "/PageMode" (Pdf.Name ("/" ^ s))
in
let catalognum = Pdf.addobj pdf catalog' in
let trailerdict' =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect catalognum)
in
{pdf with
Pdf.root = catalognum;
Pdf.trailerdict = trailerdict'}
| None -> error "bad root"
end
| _ -> error "Unknown page mode"
(* Set open action *)
let set_open_action pdf fit pagenumber =
if pagenumber > Pdfpage.endpage pdf || pagenumber < 0 then
raise (error "set_open_action: invalid page number")
else
let pageobjectnumber = select pagenumber (Pdf.page_reference_numbers pdf) in
let destination =
if fit then
Pdf.Array [Pdf.Indirect pageobjectnumber; Pdf.Name "/Fit"]
else
Pdf.Array [Pdf.Indirect pageobjectnumber; Pdf.Name "/XYZ"; Pdf.Null; Pdf.Null; Pdf.Null]
in
let open_action =
Pdf.Dictionary [("/D", destination); ("/S", Pdf.Name "/GoTo")]
in
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some catalog ->
let catalog' =
Pdf.add_dict_entry catalog "/OpenAction" open_action
in
let catalognum = Pdf.addobj pdf catalog' in
let trailerdict' =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect catalognum)
in
{pdf with Pdf.root = catalognum; Pdf.trailerdict = trailerdict'}
| None -> error "bad root"
(* \section{Set viewer preferences} *)
let set_viewer_preference (key, value, version) pdf =
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some catalog ->
let viewer_preferences =
match Pdf.lookup_direct pdf "/ViewerPreferences" catalog with
| Some d -> d
| None -> Pdf.Dictionary []
in
let viewer_preferences' =
Pdf.add_dict_entry viewer_preferences key value
in
let catalog' =
Pdf.add_dict_entry catalog "/ViewerPreferences" viewer_preferences'
in
let catalognum = Pdf.addobj pdf catalog' in
let trailerdict' =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect catalognum)
in
{pdf with
Pdf.minor = max pdf.Pdf.minor version;
Pdf.root = catalognum;
Pdf.trailerdict = trailerdict'}
| None -> error "bad root"
(* \section{Set an entry in the /Info dictionary} *)
let set_pdf_info (key, value, version) pdf =
let infodict =
match Pdf.lookup_direct pdf "/Info" pdf.Pdf.trailerdict with
| Some d -> d
| None -> Pdf.Dictionary []
in
let infodict' = Pdf.add_dict_entry infodict key value in
let objnum = Pdf.addobj pdf infodict' in
pdf.Pdf.trailerdict <-
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Info" (Pdf.Indirect objnum);
pdf.Pdf.minor <-
max pdf.Pdf.minor version;
pdf
(* \section{Set page layout} *)
let set_page_layout pdf s =
match s with
| "SinglePage" | "OneColumn" | "TwoColumnLeft"
| "TwoColumnRight" | "TwoPageLeft" | "TwoPageRight" ->
begin match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some catalog ->
let catalog' =
Pdf.add_dict_entry catalog "/PageLayout" (Pdf.Name ("/" ^ s))
in
let catalognum = Pdf.addobj pdf catalog' in
let trailerdict' =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect catalognum)
in
{pdf with
Pdf.root = catalognum;
Pdf.trailerdict = trailerdict'}
| None -> error "bad root"
end
| _ -> error "Unknown page layout"
(* \section{Set or replace metadata} *)
let set_metadata_from_bytes keepversion data pdf =
let metadata_stream =
Pdf.Stream
{contents =
(Pdf.Dictionary
["/Length", Pdf.Integer (bytes_size data);
"/Type", Pdf.Name "/Metadata";
"/Subtype", Pdf.Name "/XML"],
Pdf.Got data)}
in
let objnum = Pdf.addobj pdf metadata_stream in
let document_catalog =
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| Some s -> s
| None -> error "Malformed PDF: No root."
in
let document_catalog' =
Pdf.add_dict_entry document_catalog "/Metadata" (Pdf.Indirect objnum)
in
let rootnum = Pdf.addobj pdf document_catalog' in
let trailerdict =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect rootnum)
in
{pdf with
Pdf.trailerdict = trailerdict;
Pdf.root = rootnum;
Pdf.minor =
if keepversion then pdf.Pdf.minor else max 4 pdf.Pdf.minor}
let set_metadata keepversion filename pdf =
let ch = open_in_bin filename in
let data = mkbytes (in_channel_length ch) in
for x = 0 to bytes_size data - 1 do
bset data x (input_byte ch)
done;
set_metadata_from_bytes keepversion data pdf
(* \section{Remove metadata} *)
let remove_metadata pdf =
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| None -> error "malformed file"
| Some root ->
let root' = Pdf.remove_dict_entry root "/Metadata" in
let rootnum = Pdf.addobj pdf root' in
{pdf with
Pdf.trailerdict =
Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect rootnum);
Pdf.root =
rootnum}
(* List bookmarks *)
(* List the bookmarks, optionally deunicoding the text, in the given range to the given output *)
let list_bookmarks encoding range pdf output =
let process_string s =
let rec replace c cs = function
| [] -> []
| h::t when h = c -> cs @ replace c cs t
| h::t -> h::replace c cs t
in
(* Convert to UTF8, raw, or stripped, and escape backslashed and quotation marks *)
let codepoints = Pdftext.codepoints_of_pdfdocstring s in
let escaped =
let bs = int_of_char '\\'
and nl = int_of_char '\n'
and n = int_of_char 'n'
and q = int_of_char '\"' in
replace bs [bs; bs] (replace nl [bs; n] (replace q [bs; q] codepoints))
in
match encoding with
| UTF8 -> Pdftext.utf8_of_codepoints escaped
| Stripped -> implode (map char_of_int (lose (fun x -> x > 127) escaped))
| Raw -> s
in
let bookmarks = Pdfmarks.read_bookmarks pdf in
let inrange =
keep
(function x ->
x.Pdfmarks.target = Pdfdest.NullDestination ||
mem (Pdfpage.pagenumber_of_target pdf x.Pdfmarks.target) range) bookmarks
in
iter
(function mark ->
output.Pdfio.output_string
(Printf.sprintf "%i \"%s\" %i %s\n"
mark.Pdfmarks.level
(process_string mark.Pdfmarks.text)
(Pdfpage.pagenumber_of_target pdf mark.Pdfmarks.target)
(if mark.Pdfmarks.isopen then "open" else "")))
inrange
(* o is the stamp, u is the main pdf page *)
(* \section{Split at bookmarks} *)
(* Returns empty string on failure. Should only be used in conjunction with
split at bookmarks code, so should never fail, by definiton. *)
let remove_unsafe_characters s =
let chars =
lose
(function x ->
match x with
'/' | '?' | '<' | '>' | '\\' | ':' | '*' | '|' | '\"' | '^' | '+' | '=' -> true
| x when int_of_char x < 32 || int_of_char x > 126 -> true
| _ -> false)
(explode s)
in
match chars with
| '.'::more -> implode more
| chars -> implode chars
let get_bookmark_name pdf marks splitlevel n _ =
match keep (function m -> n = Pdfpage.pagenumber_of_target pdf m.Pdfmarks.target && m.Pdfmarks.level <= splitlevel) marks with
| {Pdfmarks.text = title}::_ -> remove_unsafe_characters title
| _ -> ""
(* @F means filename without extension *)
(* @N means sequence number with no padding *)
(* @S means start page of this section *)
(* @E means end page of this section *)
(* @B means bookmark name at start page *)
let process_others marks pdf splitlevel filename sequence startpage endpage s =
let rec procss prev = function
| [] -> rev prev
| '@'::'F'::t -> procss (rev (explode filename) @ prev) t
| '@'::'N'::t -> procss (rev (explode (string_of_int sequence)) @ prev) t
| '@'::'S'::t -> procss (rev (explode (string_of_int startpage)) @ prev) t
| '@'::'E'::t -> procss (rev (explode (string_of_int endpage)) @ prev) t
| '@'::'B'::t -> procss (rev (explode (get_bookmark_name pdf marks splitlevel startpage pdf)) @ prev) t
| h::t -> procss (h::prev) t
in
implode (procss [] (explode s))
let name_of_spec marks (pdf : Pdf.t) splitlevel spec n filename startpage endpage =
let fill l n =
let chars = explode (string_of_int n) in
if length chars > l
then implode (drop chars (length chars - l))
else implode ((many '0' (l - length chars)) @ chars)
in
let chars = explode spec in
let before, including = cleavewhile (neq '%') chars in
let percents, after = cleavewhile (eq '%') including in
if percents = []
then
process_others marks pdf splitlevel filename n startpage endpage spec
else
process_others marks pdf splitlevel filename n startpage endpage
(implode before ^ fill (length percents) n ^ implode after)
(* Find the stem of a filename *)
let stem s =
implode (rev (tail_no_fail (dropwhile (neq '.') (rev (explode (Filename.basename s))))))
(* Return list, in order, a *set* of page numbers of bookmarks at a given level *)
let bookmark_pages level pdf =
setify_preserving_order
(option_map
(function l when l.Pdfmarks.level = level -> Some (Pdfpage.pagenumber_of_target pdf l.Pdfmarks.target) | _ -> None)
(Pdfmarks.read_bookmarks pdf))
(* Called from cpdflib.ml - different from above *)
let split_on_bookmarks pdf level =
let points = lose (eq 0) (map pred (bookmark_pages level pdf))
in let pdf_pages = Pdfpage.pages_of_pagetree pdf in
let ranges = splitat points (indx pdf_pages) in
map (fun rs -> Pdfpage.pdf_of_pages pdf rs) ranges
(* Output information for each page *)
let output_page_info pdf range =
let pages = Pdfpage.pages_of_pagetree pdf
and labels = Pdfpagelabels.read pdf in
let getbox page box =
if box = "/MediaBox" then
match page.Pdfpage.mediabox with
| Pdf.Array [a; b; c; d] ->
Printf.sprintf "%f %f %f %f"
(Pdf.getnum a) (Pdf.getnum b) (Pdf.getnum c) (Pdf.getnum d)
| _ -> ""
else
match Pdf.lookup_direct pdf box page.Pdfpage.rest with
| Some (Pdf.Array [a; b; c; d]) ->
Printf.sprintf "%f %f %f %f"
(Pdf.getnum a) (Pdf.getnum b) (Pdf.getnum c) (Pdf.getnum d)
| _ -> ""
and rotation page =
Pdfpage.int_of_rotation page.Pdfpage.rotate
in
List.iter
(fun pnum ->
let page = select pnum pages in
Printf.printf "Page %i:\n" pnum;
Printf.printf "Label: %s\n"
(try Pdfpagelabels.pagelabeltext_of_pagenumber pnum labels with Not_found -> "");
Printf.printf "MediaBox: %s\n" (getbox page "/MediaBox");
Printf.printf "CropBox: %s\n" (getbox page "/CropBox");
Printf.printf "BleedBox: %s\n" (getbox page "/BleedBox");
Printf.printf "TrimBox: %s\n" (getbox page "/TrimBox");
Printf.printf "ArtBox: %s\n" (getbox page "/ArtBox");
Printf.printf "Rotation: %i\n" (rotation page))
range
(* Does the page have a defined box e.g "/CropBox" *)
let hasbox pdf page boxname =
let pages = Pdfpage.pages_of_pagetree pdf in
if page > length pages || page < 1 then raise (Failure "hasbox: bad page") else
let p = select page pages in
match Pdf.lookup_direct pdf boxname p.Pdfpage.rest with
| Some _ -> true
| _ -> false
(* Print metadata *)
let get_metadata pdf =
match Pdf.lookup_direct pdf "/Root" pdf.Pdf.trailerdict with
| None -> error "malformed file"
| Some root ->
match Pdf.lookup_direct pdf "/Metadata" root with
| Some ((Pdf.Stream _) as s) ->
Pdfcodec.decode_pdfstream pdf s;
begin match s with
| Pdf.Stream {contents = (_, Pdf.Got data)} -> Some data
| _ -> assert false
end
| _ -> None
let print_metadata pdf =
match get_metadata pdf with
None -> ()
| Some data ->
for x = 0 to bytes_size data - 1 do
Printf.printf "%c" (char_of_int (bget data x))
done
(* \section{Print font data} *)
let list_font pdf page (name, dict) =
let subtype =
match Pdf.lookup_direct pdf "/Subtype" dict with
| Some (Pdf.Name n) -> n
| _ -> ""
in let basefont =
match Pdf.lookup_direct pdf "/BaseFont" dict with
| Some (Pdf.Name n) -> n
| _ -> ""
in let encoding =
match Pdf.lookup_direct pdf "/Encoding" dict with
| Some (Pdf.Name n) -> n
| _ -> ""
in
(*i Printf.printf
"%i %s %s %s %s\n" i*)
page, name, subtype, basefont, encoding
let list_fonts pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
flatten
(map
(fun (num, page) ->
match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with
| Some (Pdf.Dictionary fontdict) ->
map (list_font pdf num) fontdict
| _ -> [])
(combine (ilist 1 (length pages)) pages))
let string_of_font (p, n, s, b, e) =
Printf.sprintf "%i %s %s %s %s\n" p n s b e
let print_fonts pdf =
flprint
(fold_left ( ^ ) "" (map string_of_font (list_fonts pdf)))
(* \section{Superimpose text, page numbers etc.} *)
type position =
| PosCentre of float * float
| PosLeft of float * float
| PosRight of float * float
| Top of float
| TopLeft of float
| TopRight of float
| Left of float
| BottomLeft of float
| Bottom of float
| BottomRight of float
| Right of float
| Diagonal
| ReverseDiagonal
| Centre
let string_of_position = function
| PosCentre (a, b) -> Printf.sprintf "PosCentre %f %f" a b
| PosLeft (a, b) -> Printf.sprintf "PosLeft %f %f" a b
| PosRight (a, b) -> Printf.sprintf "PosRight %f %f" a b
| Top a -> Printf.sprintf "Top %f" a
| TopLeft a -> Printf.sprintf "TopLeft %f" a
| TopRight a -> Printf.sprintf "TopRight %f" a
| Left a -> Printf.sprintf "Left %f" a
| BottomLeft a -> Printf.sprintf "BottomLeft %f" a
| Bottom a -> Printf.sprintf "Bottom %f" a
| BottomRight a -> Printf.sprintf "BottomRight %f" a
| Right a -> Printf.sprintf "Right %f" a
| Diagonal -> "Diagonal"
| ReverseDiagonal -> "Reverse Diagonal"
| Centre -> "Centre"
type orientation =
| Horizontal
| Vertical
| VerticalDown
type justification = LeftJustify | CentreJustify | RightJustify
(* Given the mediabox, calculate an absolute position for the text. *)
let calculate_position ignore_d w (xmin, ymin, xmax, ymax) orientation pos =
let rot = if orientation = VerticalDown then rad_of_deg 270. else 0. in
match pos with
| Centre ->
(xmin +. xmax) /. 2. -. w /. 2.,
(ymin +. ymax) /. 2.,
rot
| Diagonal ->
let angle = atan ((ymax -. ymin) /. (xmax -. xmin))
in let cx, cy = (xmax +. xmin) /. 2., (ymax +. ymin) /. 2. in
let dl = w /. 2. in
let dx = dl *. cos angle
in let dy = dl *. sin angle in
cx -. dx, cy -. dy, angle
| ReverseDiagonal ->
let angle = atan ((ymax -. ymin) /. (xmax -. xmin))
in let cx, cy = (xmax +. xmin) /. 2., (ymax +. ymin) /. 2. in
let dl = w /. 2. in
let dx = dl *. cos angle
in let dy = dl *. sin angle in
cx -. dx, (ymax +. ymin) -. (cy -. dy), angle -. ((2. *. pi) -. ((pi -. (2. *. angle)) *. 2.) /. 2.) +. pi
| PosLeft (x, y) -> xmin +. x, ymin +. y, rot
| PosCentre (x, y) -> xmin +. x -. (w /. 2.), ymin +. y, rot
| PosRight (x, y) -> xmin +. x -. w, ymin +. y, rot
| Top d ->
let d = if ignore_d then 0. else d in
(xmin +. xmax) /. 2. -. w /. 2., ymax -. d, rot
| TopLeft d ->
let d = if ignore_d then 0. else d in
xmin +. d, ymax -. d, rot
| TopRight d ->
let d = if ignore_d then 0. else d in
xmax -. d -. w, ymax -. d, rot
| Left d ->
let d = if ignore_d then 0. else d in
xmin +. d, (ymax +. ymin) /. 2., rot
| BottomLeft d ->
let d = if ignore_d then 0. else d in
xmin +. d, ymin +. d, rot
| Bottom d ->
let d = if ignore_d then 0. else d in
(xmin +. xmax) /. 2. -. w /. 2., ymin +. d, rot
| BottomRight d ->
let d = if ignore_d then 0. else d in
xmax -. d -. w, ymin +. d, rot
| Right d ->
let d = if ignore_d then 0. else d in
xmax -. d -. w, (ymax +. ymin) /. 2., rot
(* Process UTF8 text to /WinAnsiEncoding string. *)
let winansi_of_utf8 s =
(*flprint "winansi_of_utf8:";
iter (Printf.printf "%C ") (explode s);
flprint "\n";*)
let extractor = Pdftext.charcode_extractor_of_encoding Pdftext.WinAnsiEncoding
and codepoints = Pdftext.codepoints_of_utf8 s in
(*flprint "codepoints after Pdftext.codepoints_of_utf8\n";
iter (Printf.printf "%i ") codepoints;
flprint "\ndone\n";*)
implode (map char_of_int (option_map extractor codepoints))
(* Process codepoints back to UTF8, assuming it came from UTF8 to start with *)
let utf8_of_winansi s =
let text_extractor =
Pdftext.text_extractor_of_font
(Pdf.empty ())
(Pdf.Dictionary
[("/BaseFont", Pdf.Name "/TimesRoman");
("/Subtype", Pdf.Name "/Type1");
("/Encoding", Pdf.Name "/WinAnsiEncoding")])
in
let codepoints = Pdftext.codepoints_of_text text_extractor s in
Pdftext.utf8_of_codepoints codepoints
(* Get the width of some text in the given font *)
let width_of_text font text =
match font with
| Pdftext.SimpleFont {Pdftext.fontmetrics = Some fontmetrics} ->
begin try
fold_left ( +. ) 0. (map (fun c -> fontmetrics.(int_of_char c)) (explode text))
with
_ -> 0.
end
| _ -> 0.
type ops_metrics =
{metrics_text : string;
metrics_x : float;
metrics_y : float;
metrics_rot : float}
let ops_metrics : ops_metrics list ref = ref []
let ops_baseline_adjustment = ref 0.
let metrics_howmany () = length !ops_metrics
let metrics_text n =
utf8_of_winansi (select n !ops_metrics).metrics_text
let metrics_x n =
(select n !ops_metrics).metrics_x
let metrics_y n =
(select n !ops_metrics).metrics_y
let metrics_rot n =
(select n !ops_metrics).metrics_rot
let metrics_baseline_adjustment () = !ops_baseline_adjustment
let ops longest_w metrics x y rotate hoffset voffset outline linewidth unique_fontname unique_extgstatename colour fontsize text =
if metrics then
ops_metrics :=
{metrics_text = text; metrics_x = x -. hoffset; metrics_y = y -. voffset; metrics_rot = rotate}
::!ops_metrics;
[Pdfops.Op_q;
Pdfops.Op_BMC "/CPDFSTAMP";
Pdfops.Op_cm
(Pdftransform.matrix_of_transform
[Pdftransform.Translate (x -. hoffset, y -. voffset);
Pdftransform.Rotate ((0., 0.), rotate)]);
Pdfops.Op_BT;
] @
(if outline then [Pdfops.Op_w linewidth; Pdfops.Op_Tr 1] else [Pdfops.Op_Tr 0]) @
[
(match colour with (r, g, b) -> Pdfops.Op_rg (r, g, b));
(match colour with (r, g, b) -> Pdfops.Op_RG (r, g, b))]
@
(match unique_extgstatename with None -> [] | Some n -> [Pdfops.Op_gs n])
@
[Pdfops.Op_Tf (unique_fontname, fontsize);
Pdfops.Op_Tj text;
Pdfops.Op_ET;
Pdfops.Op_EMC;
Pdfops.Op_Q]
(* Find the h-offset for justification based on the longest width, the current
width, the justification and the position. *)
let find_justification_offsets longest_w w position = function
| LeftJustify ->
begin match position with
| TopLeft _ | Left _ | PosLeft _ | BottomLeft _ -> 0.
| Top _ | PosCentre _ | Bottom _ | Centre -> (longest_w -. w) /. 2.
| TopRight _ | BottomRight _ | PosRight _ | Right _ -> longest_w -. w
| Diagonal -> 0.
| ReverseDiagonal -> 0.
end
| RightJustify ->
begin match position with
| TopLeft _ | Left _ | PosLeft _ | BottomLeft _ -> ~-.(longest_w -. w)
| Top _ | PosCentre _ | Bottom _ | Centre -> ~-.((longest_w -. w) /. 2.)
| TopRight _ | BottomRight _ | PosRight _ | Right _ -> 0.
| Diagonal -> 0.
| ReverseDiagonal -> 0.
end
| CentreJustify ->
begin match position with
| TopLeft _ | Left _ | PosLeft _ | BottomLeft _ -> ~-.((longest_w -. w) /. 2.)
| Top _ | PosCentre _ | Bottom _ | Centre -> 0.
| TopRight _ | BottomRight _ | PosRight _ | Right _ -> (longest_w -. w) /. 2.
| Diagonal -> 0.
| ReverseDiagonal -> 0.
end
(* Lex an integer from the table *)
let extract_num header s =
match Pdfgenlex.lex_string (Hashtbl.find header s) with
[Pdfgenlex.LexInt i] -> Pdf.Integer i
| [Pdfgenlex.LexReal f] -> Pdf.Real f
| _ -> raise (Failure ("extract_num: " ^ s))
let extract_fontbbox header s =
let num = function
Pdfgenlex.LexInt i -> Pdf.Integer i
| Pdfgenlex.LexReal f -> Pdf.Real f
| _ -> raise (Failure "extract_fontbbox")
in
match Pdfgenlex.lex_string (Hashtbl.find header s) with
[a; b; c; d] -> [num a; num b; num c; num d]
| _ -> raise (Failure "extract_fontbbox")
let remove_slash s =
match explode s with
'/'::x -> implode x
| _ -> raise (Failure "remove_slash")
let extract_widths chars_and_widths =
let win_to_name = List.map (fun (x, y) -> (y, x)) Pdfglyphlist.name_to_win in
List.map
(fun x ->
try
let name = List.assoc x win_to_name in
let width = List.assoc (remove_slash name) chars_and_widths in
width
with
_ -> 0)
(ilist 0 255)
let make_font embed fontname =
let font = unopt (Pdftext.standard_font_of_name ("/" ^ fontname)) in
let header, width_data, _, chars_and_widths = Pdfstandard14.afm_data font in
let widths = extract_widths (list_of_hashtbl chars_and_widths) in
let flags = Pdfstandard14.flags_of_standard_font font in
let fontbbox = extract_fontbbox header "FontBBox" in
let italicangle = extract_num header "ItalicAngle" in
let ascent = try extract_num header "Ascender" with _ -> Pdf.Integer 0 in
let descent = try extract_num header "Descender" with _ -> Pdf.Integer 0 in
let capheight = try extract_num header "CapHeight" with _ -> Pdf.Integer 0 in
let stemv = Pdfstandard14.stemv_of_standard_font font in
let fontdescriptor =
Pdf.Dictionary
[("/Type", Pdf.Name "/FontDescriptor");
("/FontName", Pdf.Name ("/" ^ fontname));
("/Flags", Pdf.Integer flags);
("/FontBBox", Pdf.Array fontbbox);
("/ItalicAngle", italicangle);
("/Ascent", ascent);
("/Descent", descent);
("/CapHeight", capheight);
("/StemV", Pdf.Integer stemv)]
in
(* With -no-embed-font, we use the standard encoding, and just the
* minimal stuff. Without -no-embed-font, we switch to WinAnsiEncoding,
* and fill out everything except the font file instead *)
if embed then
Pdf.Dictionary
[("/Type", Pdf.Name "/Font");
("/Subtype", Pdf.Name "/Type1");
("/BaseFont", Pdf.Name ("/" ^ fontname));
("/Encoding", Pdf.Name "/WinAnsiEncoding");
("/FirstChar", Pdf.Integer 0);
("/LastChar", Pdf.Integer 255);
("/Widths", Pdf.Array (map (fun x -> Pdf.Integer x) widths));
("/FontDescriptor", fontdescriptor)]
else
Pdf.Dictionary
[("/Type", Pdf.Name "/Font");
("/Subtype", Pdf.Name "/Type1");
("/Encoding", Pdf.Name "/WinAnsiEncoding");
("/BaseFont", Pdf.Name ("/" ^ fontname))]
let extract_page_text only_fontsize pdf _ page =
let text_extractor = ref None in
let right_font_size = ref false in
fold_left ( ^ ) ""
(map
(function
| Pdfops.Op_Tf (fontname, fontsize) ->
right_font_size :=
begin match only_fontsize with
Some x -> x = fontsize
| _ -> false
end;
let fontdict =
match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with
| None -> raise (Pdf.PDFError "Missing /Font in text extraction")
| Some d ->
match Pdf.lookup_direct pdf fontname d with
| None -> raise (Pdf.PDFError "Missing font in text extraction")
| Some d -> d
in
text_extractor := Some (Pdftext.text_extractor_of_font pdf fontdict);
""
| Pdfops.Op_Tj text when !text_extractor <> None ->
if not !right_font_size then
""
else
Pdftext.utf8_of_codepoints
(Pdftext.codepoints_of_text (unopt !text_extractor) text)
| Pdfops.Op_TJ (Pdf.Array objs) when !text_extractor <> None ->
if not !right_font_size then
""
else
fold_left ( ^ ) ""
(option_map
(function
| Pdf.String text ->
Some
(Pdftext.utf8_of_codepoints
(Pdftext.codepoints_of_text (unopt !text_extractor) text))
| _ -> None)
objs)
| _ -> "")
(Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content))
(* For each page, extract all the ops with text in them, and concatenate it all together *)
let extract_text extract_text_font_size pdf range =
fold_left (fun x y -> x ^ (if x <> "" && y <> "" then "\n" else "") ^ y) ""
(map_pages (extract_page_text extract_text_font_size pdf) pdf range)
let addtext
metrics lines linewidth outline fast colour fontname embed bates batespad fontsize font
underneath position hoffset voffset text pages orientation cropbox opacity
justification filename extract_text_font_size pdf
=
let endpage = Pdfpage.endpage pdf in
let replace_pairs pdf filename bates batespad num page =
["%Page", (fun () -> string_of_int num);
"%Roman", (fun () -> roman_upper num);
"%roman", (fun () -> roman_lower num);
"%filename", (fun () -> filename);
"%Label", (fun () -> pagelabel pdf num);
"%EndPage", (fun () -> string_of_int endpage);
"%EndLabel", (fun () -> pagelabel pdf endpage);
"%ExtractedText", (fun () -> extract_page_text extract_text_font_size pdf num page);
"%Bates",
(fun () ->
(let numstring = string_of_int (bates + num - 1) in
match batespad with
None -> numstring
| Some w ->
if String.length numstring >= w
then numstring
else implode (many '0' (w - String.length numstring)) ^ numstring))]
in
let addtext_page num page =
let resources', unique_extgstatename =
if opacity < 1.0 then
let dict =
match Pdf.lookup_direct pdf "/ExtGState" page.Pdfpage.resources with
| Some d -> d
| None -> Pdf.Dictionary []
in
let unique_extgstatename = Pdf.unique_key "gs" dict in
let dict' =
Pdf.add_dict_entry dict unique_extgstatename
(Pdf.Dictionary [("/ca", Pdf.Real opacity); ("/CA", Pdf.Real opacity)])
in
Pdf.add_dict_entry page.Pdfpage.resources "/ExtGState" dict', Some unique_extgstatename
else
page.Pdfpage.resources, None
in
let fontdict =
match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with
| None -> Pdf.Dictionary []
| Some d -> d
in
let unique_fontname = Pdf.unique_key "F" fontdict in
let ops =
let text = process_text text (replace_pairs pdf filename bates batespad num page) in
let calc_textwidth text =
match font with
| Some f ->
let rawwidth =
Pdfstandard14.textwidth
false
(if embed then Pdftext.WinAnsiEncoding else Pdftext.StandardEncoding)
f
text
in
(float rawwidth *. fontsize) /. 1000.
| None ->
let font =
match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with
| Some fontdict ->
begin match Pdf.lookup_direct pdf fontname fontdict with
| Some font -> font
| _ -> failwith "addtext: bad font A"
end
| _ -> failwith "addtext: bad font B"
in
let rawwidth = width_of_text (Pdftext.read_font pdf font) text in
(rawwidth *. fontsize) /. 1000.
in
let expanded_lines =
map
(function text ->
process_text text (replace_pairs pdf filename bates batespad num page))
lines
in
let textwidth = calc_textwidth text
and allwidths = map calc_textwidth expanded_lines in
let longest_w = last (sort compare allwidths) in
let joffset = find_justification_offsets longest_w textwidth position justification in
let mediabox =
if cropbox then
match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some pdfobject -> Pdf.parse_rectangle (Pdf.direct pdf pdfobject)
| None -> Pdf.parse_rectangle page.Pdfpage.mediabox
else
Pdf.parse_rectangle page.Pdfpage.mediabox
in
let x, y, rotate = calculate_position false textwidth mediabox orientation position in
let hoffset, voffset =
if position = Diagonal || position = ReverseDiagonal
then -. (cos ((pi /. 2.) -. rotate) *. voffset), sin ((pi /. 2.) -. rotate) *. voffset
else hoffset, voffset
in
match font with
| Some f ->
ops longest_w metrics x y rotate (hoffset +. joffset) voffset outline linewidth
unique_fontname unique_extgstatename colour fontsize text
| None ->
ops longest_w metrics x y rotate (hoffset +. joffset) voffset outline linewidth
fontname None colour fontsize text
in
let newresources =
match font with
| Some _ ->
let newfontdict =
Pdf.add_dict_entry fontdict unique_fontname (make_font embed fontname)
in
Pdf.add_dict_entry resources' "/Font" newfontdict
| None -> page.Pdfpage.resources
in
let page = {page with Pdfpage.resources = newresources} in
if underneath
then Pdfpage.prepend_operators pdf ops ~fast:fast page
else Pdfpage.postpend_operators pdf ops ~fast:fast page
in
if metrics then
(ignore (iter_pages (fun a b -> ignore (addtext_page a b)) pdf pages); pdf)
else
process_pages addtext_page pdf pages
(* Prev is a list of lists of characters *)
let split_at_newline t =
let rec split_at_newline_inner prev = function
| [] -> rev (map implode (map rev prev))
| '\\'::'\\'::'n'::t -> split_at_newline_inner (('n'::'\\'::'\\'::hd prev)::tl prev) t
| '\\'::'n'::t -> split_at_newline_inner ([]::prev) t
| h::t -> split_at_newline_inner ((h::hd prev)::tl prev) t
in
split_at_newline_inner [[]] (explode t)
let rec unescape_chars prev = function
| [] -> rev prev
| '\\'::('0'..'7' as a)::('0'..'7' as b)::('0'..'7' as c)::t ->
let chr = char_of_int (int_of_string ("0o" ^ implode [a;b;c])) in
unescape_chars (chr::prev) t
| '\\'::'\\'::t -> unescape_chars ('\\'::prev) t
| '\\'::c::t when c <> 'n' -> unescape_chars (c::prev) t
| h::t -> unescape_chars (h::prev) t
let unescape_string s =
implode (unescape_chars [] (explode s))
let
addtexts metrics linewidth outline fast fontname font embed bates batespad colour position linespacing
fontsize underneath text pages orientation cropbox opacity justification
midline topline filename extract_text_font_size pdf
=
(*flprint "addtexts:\n";
iter (Printf.printf "%C ") (explode text);
flprint "\n";
Printf.printf "\nCpdf.addtexts: metrics = %b" metrics;
flprint "\n";*)
(*Printf.printf "linewidth = %f\n" linewidth;
Printf.printf "outline = %b\n" outline;
Printf.printf "fast = %b\n" fast;
Printf.printf "fontname = %s\n" fontname;
Printf.printf "winansi text = %s\n" text;
Printf.printf "position = %s\n" (string_of_position position);
Printf.printf "bates = %i\n" bates;
Printf.printf "linespacing = %f\n" linespacing;
Printf.printf "fontsize = %f\n" fontsize;
Printf.printf "underneath = %b\n" underneath;
Printf.printf "font = %s\n" begin match font with None -> "None" | Some x -> Pdftext.string_of_standard_font x end;
Printf.printf "justification = %s\n"
begin match justification with LeftJustify -> "left" | RightJustify -> "right" | CentreJustify -> "centre" end;
Printf.printf "midline = %b\n" midline;
begin match colour with r, g, b -> Printf.printf "%f, %f, %f\n" r g b end;
Printf.printf "opacity = %f\n" opacity;
flprint "\n";
Printf.printf "relative-to-cropbox = %b" cropbox;
flprint "\n";*)
ops_metrics := [];
let text = winansi_of_utf8 text in
let lines = map unescape_string (split_at_newline text) in
let pdf = ref pdf in
let voffset =
match position with
| Bottom _ | BottomLeft _ | BottomRight _ ->
ref (0. -. (linespacing *. fontsize *. (float (length lines) -. 1.)))
| Left _ | Right _ ->
(* Vertically align *)
ref (0. -. (linespacing *. ((fontsize *. (float (length lines) -. 1.)) /. 2.)))
| Diagonal | ReverseDiagonal ->
(* Change so that the whole paragraph sits on the centre... *)
ref (0. -. ((linespacing *. fontsize *. (float (length lines) -. 1.)) /. 2.))
| _ -> ref 0.
in
if midline then
begin match font with
| Some font ->
let baseline_adjustment =
(fontsize *. float (Pdfstandard14.baseline_adjustment font)) /. 1000.
in
ops_baseline_adjustment := baseline_adjustment;
voffset := !voffset +. baseline_adjustment
| _ ->
ops_baseline_adjustment := 0.
end
else
if topline then
begin match font with
| Some font ->
let baseline_adjustment =
(fontsize *. float (Pdfstandard14.baseline_adjustment font) *. 2.0) /. 1000.
in
ops_baseline_adjustment := baseline_adjustment;
voffset := !voffset +. baseline_adjustment
| _ ->
ops_baseline_adjustment := 0.
end
else
ops_baseline_adjustment := 0.;
iter
(fun line ->
let voff, hoff =
if orientation = Vertical then 0., -.(!voffset) else !voffset, 0.
in
pdf :=
addtext metrics lines linewidth outline fast colour fontname
embed bates batespad fontsize font underneath position hoff voff line
pages orientation cropbox opacity justification filename
extract_text_font_size
!pdf;
voffset := !voffset +. (linespacing *. fontsize))
lines;
ops_metrics := rev !ops_metrics;
!pdf
let removetext range pdf =
(* Could fail on nesting, or other marked content inside our marked content.*)
let rec remove_until_last_EMC level = function
| [] -> []
| Pdfops.Op_BMC "/CPDFSTAMP"::more ->
remove_until_last_EMC (level + 1) more
| Pdfops.Op_EMC::more ->
if level = 1
then more
else remove_until_last_EMC (level - 1) more
| _::more ->
remove_until_last_EMC level more
in
let rec remove_stamps prev = function
| [] -> rev prev
| Pdfops.Op_BMC "/CPDFSTAMP"::more ->
let rest = remove_until_last_EMC 1 more in
remove_stamps prev rest
| h::t -> remove_stamps (h::prev) t
in
let removetext_page _ page =
{page with
Pdfpage.content =
let ops = Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content in
[Pdfops.stream_of_ops (remove_stamps [] ops)]}
in
process_pages removetext_page pdf range
(* \section{Padding with blank pages.} *)
let insert_after pos page pages =
let before, after = cleave pages pos in
before @ [page] @ after
(* Insert many. *)
let rec insert_after_many pages = function
| [] -> pages
| (pos, page)::more ->
let pages' = insert_after pos page pages in
insert_after_many pages' (map (fun (p, pa) -> p + 1, pa) more)
(* For each pagenum in the range, increment the count by padsize, and carry on. e.g
insert_after_many_changes 1 0 [2] [1; 2; 3] --> [(1, 1); (2, 2); (3, 4)] *)
let rec insert_after_many_changes isbefore padsize offset range = function
[] -> []
| h::t ->
let item = (h, h + offset + if isbefore && mem h range then 1 else 0) in
if mem h range then
item::insert_after_many_changes isbefore padsize (offset + padsize) range t
else
item::insert_after_many_changes isbefore padsize offset range t
let print_changes =
List.iter (fun (f, t) -> Printf.printf "%i --> %i\n" f t)
let pad range pdf isbefore =
let i = if isbefore then 1 else 0 in
let pages = Pdfpage.pages_of_pagetree pdf in
let blankpages =
map
(fun n ->
{Pdfpage.content = [];
Pdfpage.mediabox = (select (n + i) pages).Pdfpage.mediabox;
Pdfpage.resources = Pdf.Dictionary [];
Pdfpage.rotate = (select (n + i) pages).Pdfpage.rotate;
Pdfpage.rest = (select (n + i) pages).Pdfpage.rest})
range
in
let pages' = insert_after_many pages (combine range blankpages) in
let changes =
insert_after_many_changes
isbefore 1 0 (List.map (fun x -> x + i) range) (ilist 1 (length pages))
in
(*print_changes changes;*)
Pdfpage.change_pages ~changes true pdf pages'
let padafter range pdf =
let isinpdf n = mem n (ilist 1 (Pdfpage.endpage pdf)) in
if not (fold_left ( && ) true (map isinpdf range)) then
raise (Failure "padafter: range contains pages not present in pdf");
pad range pdf false
let padbefore range pdf =
let isinpdf n = mem n (ilist 1 (Pdfpage.endpage pdf)) in
if not (fold_left ( && ) true (map isinpdf range)) then
raise (Failure "padbefore: range contains pages not present in pdf");
pad (map pred range) pdf true
let padmultiple n pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
let len = length pages in
let pages_to_add = if len / n * n = len then 0 else n - (len mod n) in
if pages_to_add > 0 then
let blankpages =
many
{Pdfpage.content = [];
Pdfpage.mediabox = (select len pages).Pdfpage.mediabox;
Pdfpage.resources = Pdf.Dictionary [];
Pdfpage.rotate = (select len pages).Pdfpage.rotate;
Pdfpage.rest = (select len pages).Pdfpage.rest}
pages_to_add
in
let changes = map (fun x -> (x, x)) (ilist 1 (length pages)) in
Pdfpage.change_pages ~changes true pdf (pages @ blankpages)
else
pdf
(* \section{Shift page data} *)
let make_mediabox (xmin, ymin, xmax, ymax) =
Pdf.Array
[Pdf.Real xmin; Pdf.Real ymin; Pdf.Real xmax; Pdf.Real ymax]
(* Change the media box and other known boxes by the function [f] which takes
xmin, xmax, ymin, ymax as input. *)
let change_boxes f pdf page =
let names = ["/TrimBox"; "/ArtBox"; "/CropBox"; "/BleedBox"]
in let getbox n =
Pdf.lookup_direct pdf n page.Pdfpage.rest
in
let boxes = combine names (map getbox names) in
let toreplace = lose (function (_, None) -> true | _ -> false) boxes in
let toreplace =
map
(function (name, Some value) -> (name, value) | _ -> assert false)
toreplace
in
let rest' =
fold_left
(fun e (k, v) ->
let v =
make_mediabox (f (Pdf.parse_rectangle v))
in
Pdf.replace_dict_entry e k v)
page.Pdfpage.rest
toreplace
in
{page with
Pdfpage.mediabox =
make_mediabox (f (Pdf.parse_rectangle page.Pdfpage.mediabox));
Pdfpage.rest = rest'}
(* The content is flipped by altering any use of [Op_cm]. But we must also
alter any /Matrix entries in pattern dictionaries for tiled and shading
patterns. In addition, shadings used by Op_sh in the main page content and in
xobjects must be altered. *)
(*let rec change_shadings pdf tr resources =
let transform_shading s =
s
in
try
let resources =
begin match Pdf.lookup_direct pdf "/Shading" resources with
| Some (Pdf.Dictionary shadings) ->
let names, nums =
split
(map
(fun (name, shading) ->
Printf.printf "Fixing up shading %s\n" name;
name, Pdf.addobj pdf (transform_shading shading))
shadings)
in
let entries =
map2 (fun name num -> name, Pdf.Indirect num) names nums
in
Pdf.add_dict_entry resources "/Shading" (Pdf.Dictionary entries)
| _ -> resources
end
in
let process_xobject xobject =
change_shadings pdf tr xobject
in
begin match Pdf.lookup_direct pdf "/XObject" resources with
| Some (Pdf.Dictionary xobjects) ->
let names, nums =
split
(map
(fun (name, xobject) ->
Printf.printf "Looking for shadings in xobject %s\n" name;
name, Pdf.addobj pdf (process_xobject xobject))
xobjects)
in
let entries =
map2 (fun name num -> name, Pdf.Indirect num) names nums
in
Pdf.add_dict_entry resources "/XObject" (Pdf.Dictionary entries)
| _ -> resources
end
with
_ -> resources*)
let change_pattern_matrices pdf tr resources =
try
(*let resources = change_shadings pdf tr resources in*)
begin match Pdf.lookup_direct pdf "/Pattern" resources with
| Some (Pdf.Dictionary patterns) ->
let names, nums =
split
(map
(fun (name, p) ->
let old_pattern = Pdf.direct pdf p in
let new_pattern =
let existing_tr = Pdf.parse_matrix pdf "/Matrix" old_pattern in
let new_tr = Pdftransform.matrix_compose (Pdftransform.matrix_invert tr) existing_tr in
Pdf.add_dict_entry old_pattern "/Matrix" (Pdf.make_matrix new_tr)
in
name, Pdf.addobj pdf new_pattern)
patterns)
in
let entries =
map2 (fun name num -> name, Pdf.Indirect num) names nums
in
Pdf.add_dict_entry resources "/Pattern" (Pdf.Dictionary entries)
| _ -> resources
end
with
Pdftransform.NonInvertable -> resources
let shift_page ?(fast=false) dxdylist pdf pnum page =
let dx, dy = List.nth dxdylist (pnum - 1) in
let transform_op =
Pdfops.Op_cm (Pdftransform.matrix_of_op (Pdftransform.Translate (dx, dy)))
in
let resources' =
change_pattern_matrices pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page.Pdfpage.resources
in
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'}
let shift_pdf ?(fast=false) dxdylist pdf range =
process_pages (shift_page ~fast dxdylist pdf) pdf range
(* Change a page's media box so its minimum x and y are 0, making other
operations simpler to think about. Any shift that is done is reflected in
other boxes (clip etc.) *)
let rectify_boxes ?(fast=false) pdf page =
let minx, miny, _, _ =
Pdf.parse_rectangle page.Pdfpage.mediabox
in
let f (iminx, iminy, imaxx, imaxy) =
iminx -. minx, iminy -. miny, imaxx -. minx, imaxy -. miny
in
let page = change_boxes f pdf page in
if minx <> 0. || miny <> 0.
then shift_page ~fast [(-.minx),(-.miny)] pdf 1 page
else page
(* \section{Flip pages} *)
let flip_page ?(fast=false) transform_op pdf _ page =
let minx, miny, maxx, maxy =
Pdf.parse_rectangle page.Pdfpage.mediabox
in
let tr = transform_op minx miny maxx maxy in
let resources =
change_pattern_matrices pdf tr page.Pdfpage.resources
in
Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast {page with Pdfpage.resources = resources}
let vflip_pdf ?(fast=false) pdf range =
let transform_op _ miny _ maxy =
Pdftransform.matrix_of_op
(Pdftransform.Scale ((0., ((miny +. maxy) /. 2.)), 1., -.1.))
in
process_pages (flip_page ~fast transform_op pdf) pdf range
let hflip_pdf ?(fast=false) pdf range =
let transform_op minx _ maxx _ =
Pdftransform.matrix_of_op
(Pdftransform.Scale (((minx +. maxx) /. 2., 0.), -.1., 1.))
in
process_pages (flip_page ~fast transform_op pdf) pdf range
let stamp_shift_of_position topline midline sw sh w h p =
let half x = x /. 2.
and dy =
if midline then sh /. 2.
else if topline then sh
else 0.
in
match p with
| PosCentre (ox, oy) -> ox -. half sw, oy -. dy
| PosLeft (ox, oy) -> ox, oy -. dy
| PosRight (ox, oy) -> ox -. sw, oy -. dy
| Top o -> half w -. half sw, h -. o -. sh -. dy
| TopLeft o -> o, h -. sh -. o -. dy
| TopRight o -> w -. sw -. o, h -. sh -. o -. dy
| Left o -> o, half h -. half sh -. dy
| BottomLeft o -> o, o -. dy
| Bottom o -> half w -. half sw, o -. dy
| BottomRight o -> w -. sw -. o, o -. dy
| Right o -> w -. sw -. o, half h -. half sh -. dy
| Diagonal | ReverseDiagonal | Centre ->
half w -. half sw, half h -. half sh -. dy
(* Combine Pdfpage.rest items for two PDFs. For now, we combine /Annots, and
* copy everything else from adict. What else should we combine? *)
let combine_page_items pdf adict bdict =
let getannots dict =
begin match dict with
Pdf.Dictionary d ->
begin match lookup "/Annots" d with
Some (Pdf.Array items) -> items
| _ -> []
end
| _ -> []
end
in
let a_annots = getannots adict in
let b_annots = getannots bdict in
match a_annots @ b_annots with
[] -> adict
| annots -> Pdf.add_dict_entry adict "/Annots" (Pdf.Array annots)
let do_stamp relative_to_cropbox fast position topline midline scale_to_fit isover pdf o u opdf =
(* Scale page stamp o to fit page u *)
let sxmin, symin, sxmax, symax =
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" o.Pdfpage.rest with | Some r -> r | None -> o.Pdfpage.mediabox)
in let txmin, tymin, txmax, tymax =
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" u.Pdfpage.rest with | Some r -> r | None -> u.Pdfpage.mediabox)
in
let o =
if scale_to_fit then
let xmag = (txmax -. txmin) /. (sxmax -. sxmin) in
let ymag = (tymax -. tymin) /. (symax -. symin) in
let scale =
if xmag < 0.999 && ymag < 0.999 then
if xmag > ymag then xmag else ymag
else if xmag >= 1.001 && ymag >= 1.001 then
if xmag > ymag then ymag else xmag
else if xmag >= 1.001 then ymag
else xmag
in
let dx = txmin +. ((txmax -. txmin) -. (sxmax -. sxmin) *. scale) /. 2. in
let dy = tymin +. ((tymax -. tymin) -. (symax -. symin) *. scale) /. 2. in
let scale_op =
Pdfops.Op_cm
(Pdftransform.matrix_of_transform
([Pdftransform.Translate (dx, dy)] @
(if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @
[Pdftransform.Scale ((sxmin, symin), scale, scale)]))
in
Pdfpage.prepend_operators pdf [scale_op] ~fast o
else
let sw = sxmax -. sxmin and sh = symax -. symin
and w = txmax -. txmin and h = tymax -. tymin in
let dx, dy = stamp_shift_of_position topline midline sw sh w h position in
let translate_op =
Pdfops.Op_cm
(Pdftransform.matrix_of_transform
((if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @
[Pdftransform.Translate (dx, dy)]))
in
Pdfpage.prepend_operators pdf [translate_op] ~fast o
in
{u with
Pdfpage.content =
(if isover then ( @ ) else ( @@ ))
(protect fast pdf u.Pdfpage.resources u.Pdfpage.content)
(protect fast pdf o.Pdfpage.resources o.Pdfpage.content);
Pdfpage.rest =
combine_page_items pdf u.Pdfpage.rest o.Pdfpage.rest;
Pdfpage.resources =
combine_pdf_resources pdf u.Pdfpage.resources o.Pdfpage.resources}
(* Alter bookmark destinations given a hash table of (old page reference
* number, new page reference number) pairings *)
let change_destination t = function
Pdfdest.XYZ (Pdfdest.PageObject p, a, b, c) ->
Pdfdest.XYZ (Pdfdest.PageObject (Hashtbl.find t p), a, b, c)
| Pdfdest.Fit (Pdfdest.PageObject p) ->
Pdfdest.Fit (Pdfdest.PageObject (Hashtbl.find t p))
| Pdfdest.FitH (Pdfdest.PageObject p, x) ->
Pdfdest.FitH (Pdfdest.PageObject (Hashtbl.find t p), x)
| Pdfdest.FitV (Pdfdest.PageObject p, x) ->
Pdfdest.FitV (Pdfdest.PageObject (Hashtbl.find t p), x)
| Pdfdest.FitR (Pdfdest.PageObject p, a, b, c, d) ->
Pdfdest.FitR (Pdfdest.PageObject (Hashtbl.find t p), a, b, c, d)
| Pdfdest.FitB (Pdfdest.PageObject p) ->
Pdfdest.Fit (Pdfdest.PageObject (Hashtbl.find t p))
| Pdfdest.FitBH (Pdfdest.PageObject p, x) ->
Pdfdest.FitBH (Pdfdest.PageObject (Hashtbl.find t p), x)
| Pdfdest.FitBV (Pdfdest.PageObject p, x) ->
Pdfdest.FitBV (Pdfdest.PageObject (Hashtbl.find t p), x)
| x -> x
let change_bookmark t m =
{m with Pdfmarks.target =
try change_destination t m.Pdfmarks.target with Not_found -> m.Pdfmarks.target}
let stamp relative_to_cropbox position topline midline fast scale_to_fit isover range over pdf =
let prefix = Pdfpage.shortest_unused_prefix pdf in
Pdfpage.add_prefix over prefix;
let marks = Pdfmarks.read_bookmarks pdf in
let marks_refnumbers = Pdf.page_reference_numbers pdf in
let pdf = Pdfmarks.remove_bookmarks pdf in
let over = Pdfmarks.remove_bookmarks over in
let pageseqs = ilist 1 (Pdfpage.endpage pdf) in
let over_firstpage_pdf =
match Pdfpage.pages_of_pagetree over with
| [] -> error "empty PDF"
| h::_ -> Pdfpage.change_pages ~changes:[(1, 1)] true over [h]
in
let merged =
Pdfmerge.merge_pdfs
false false ["a"; "b"] [pdf; over_firstpage_pdf] [pageseqs; [1]]
in
let merged =
{merged with Pdf.saved_encryption = pdf.Pdf.saved_encryption}
in
let merged = copy_id true pdf merged in
let merged_pages = Pdfpage.pages_of_pagetree merged in
let under_pages, over_page =
all_but_last merged_pages, last merged_pages
in
let new_pages =
map2
(fun pageseq under_page ->
do_stamp relative_to_cropbox fast position topline midline scale_to_fit isover merged
(if mem pageseq range then over_page else
Pdfpage.blankpage Pdfpaper.a4)
under_page over)
pageseqs
under_pages
in
let changed =
let changes =
List.map (fun x -> (x, x)) (ilist 1 (length new_pages))
in
Pdfpage.change_pages ~changes true merged new_pages
in
let new_refnumbers = Pdf.page_reference_numbers changed in
let changetable = hashtable_of_dictionary (List.combine marks_refnumbers new_refnumbers) in
let new_marks = map (change_bookmark changetable) marks in
Pdfmarks.add_bookmarks new_marks changed
(* Combine pages from two PDFs. For now, assume equal length. *)
(* If [over] has more pages than [under], chop the excess. If the converse, pad
[over] to the same length *)
let equalize_pages under over =
let length_under = Pdfpage.endpage under in
let length_over = Pdfpage.endpage over in
if length_over > length_under then
let changes =
List.map (fun x -> (x, x)) (ilist 1 length_under)
in
(under,
(Pdfpage.change_pages
~changes true over (take (Pdfpage.pages_of_pagetree over) length_under)))
else if length_under > length_over then
let changes =
List.map (fun x -> (x, x)) (ilist 1 length_over)
in
(under,
Pdfpage.change_pages
~changes true over
(Pdfpage.pages_of_pagetree over @
(many (Pdfpage.blankpage Pdfpaper.a4) (length_under - length_over))))
else
under, over
let combine_pages fast under over scaletofit swap equalize =
let debug_combine_pages = false in
let debug_pdf pdf n =
if debug_combine_pages then
begin Pdf.remove_unreferenced pdf; Pdfwrite.pdf_to_file pdf n end
in
Pdfpage.add_prefix over (Pdfpage.shortest_unused_prefix under);
let marks_under, marks_over = Pdfmarks.read_bookmarks under, Pdfmarks.read_bookmarks over in
let under, over = if equalize then equalize_pages under over else under, over in
let under_length, over_length = Pdfpage.endpage under, Pdfpage.endpage over in
if under_length <> over_length then
raise (Pdf.PDFError "combine_pages: not of equal length")
else
let pageseqs_under = ilist 1 (Pdfpage.endpage under) in
let pageseqs_over = ilist 1 (Pdfpage.endpage over) in
let merged =
Pdfmerge.merge_pdfs
false false ["a"; "b"] [under; over] [pageseqs_under; pageseqs_over]
in
debug_pdf merged "merged.pdf";
let under_pages, over_pages =
cleave (Pdfpage.pages_of_pagetree merged) under_length
in
let new_pages =
map2
(fun o u ->
do_stamp
false fast (BottomLeft 0.) false false scaletofit (not swap) merged o u over)
over_pages under_pages
in
(* Build the changes. 123456 -> 123123 *)
let changes =
let len = List.length new_pages in
combine (ilist 1 (len * 2)) (let x = ilist 1 len in x @ x)
in
let changed = Pdfpage.change_pages ~changes true merged new_pages in
let r = Pdfmarks.add_bookmarks (marks_under @ marks_over) changed in
debug_pdf r "final.pdf";
r
let nobble_page pdf _ page =
let minx, miny, maxx, maxy =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
let fontdict =
match Pdf.lookup_direct pdf "/Font" page.Pdfpage.resources with
| None -> Pdf.Dictionary []
| Some d -> d
in
let fontname = Pdf.unique_key "F" fontdict in
let width = maxx -. minx in let height = maxy -. miny in
let scalex =
(width *. 1000.) /. float (Pdfstandard14.textwidth false Pdftext.StandardEncoding Pdftext.Helvetica "DEMO")
in
let page' =
let font =
Pdf.Dictionary
[("/Type", Pdf.Name "/Font");
("/Subtype", Pdf.Name "/Type1");
("/BaseFont", Pdf.Name "/Helvetica")]
in let ops =
[Pdfops.Op_BMC "/CPDFSTAMP";
Pdfops.Op_cm
(Pdftransform.matrix_of_transform
[Pdftransform.Translate (minx, miny +. height /. 2.)]);
Pdfops.Op_gs "/gs0";
Pdfops.Op_BT;
Pdfops.Op_Tf (fontname, scalex);
Pdfops.Op_Tj "DEMO";
Pdfops.Op_ET;
Pdfops.Op_EMC]
in
{(Pdfpage.blankpage Pdfpaper.a4) with
Pdfpage.mediabox = page.Pdfpage.mediabox;
Pdfpage.content = [Pdfops.stream_of_ops ops];
Pdfpage.resources =
Pdf.Dictionary
[("/Font", Pdf.Dictionary [(fontname, font)]);
("/ExtGState", Pdf.Dictionary
["/gs0",
Pdf.Dictionary["/Type", Pdf.Name "/ExtGState"; "/ca", Pdf.Real 0.2]]);
]
}
in
do_stamp false false (BottomLeft 0.) false false false true pdf page' page (Pdf.empty ())
(* \section{Set media box} *)
let set_mediabox xywhlist pdf range =
let crop_page pnum page =
let x, y, w, h = List.nth xywhlist (pnum - 1) in
{page with
Pdfpage.mediabox =
(Pdf.Array
[Pdf.Real x; Pdf.Real y;
Pdf.Real (x +. w); Pdf.Real (y +. h)])}
in
process_pages crop_page pdf range
let setBox box minx maxx miny maxy pdf range =
let set_box_page _ page =
{page with
Pdfpage.rest =
Pdf.add_dict_entry
page.Pdfpage.rest box
(Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy])}
in
process_pages set_box_page pdf range
(* \section{Cropping} *)
let crop_pdf xywhlist pdf range =
let crop_page pagenum page =
{page with
Pdfpage.rest =
(Pdf.add_dict_entry
page.Pdfpage.rest
"/CropBox"
(let x, y, w, h = List.nth xywhlist (pagenum - 1) in
(Pdf.Array
[Pdf.Real x; Pdf.Real y;
Pdf.Real (x +. w); Pdf.Real (y +. h)])))}
in
process_pages crop_page pdf range
let remove_cropping_pdf pdf range =
let remove_cropping_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/CropBox")}
in
process_pages remove_cropping_page pdf range
let remove_trim_pdf pdf range =
let remove_trim_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/TrimBox")}
in
process_pages remove_trim_page pdf range
let remove_art_pdf pdf range =
let remove_art_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/ArtBox")}
in
process_pages remove_art_page pdf range
let remove_bleed_pdf pdf range =
let remove_bleed_page _ page =
{page with
Pdfpage.rest =
(Pdf.remove_dict_entry page.Pdfpage.rest "/BleedBox")}
in
process_pages remove_bleed_page pdf range
(* \section{Rotating pages} *)
let rotate_pdf r pdf range =
let rotate_page _ page =
{page with Pdfpage.rotate =
Pdfpage.rotation_of_int r}
in
process_pages rotate_page pdf range
let rotate_pdf_by r pdf range =
let rotate_page_by _ page =
{page with Pdfpage.rotate =
Pdfpage.rotation_of_int ((Pdfpage.int_of_rotation page.Pdfpage.rotate + r) mod 360)}
in
process_pages rotate_page_by pdf range
let rotate_page_contents ~fast rotpoint r pdf _ page =
let rotation_point =
match rotpoint with
| None ->
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
| Some point -> point
in
let tr =
Pdftransform.matrix_of_op
(Pdftransform.Rotate (rotation_point, -.(rad_of_deg r)))
in let tr2 =
Pdftransform.matrix_of_op
(Pdftransform.Rotate (rotation_point, rad_of_deg r))
in
let transform_op = Pdfops.Op_cm tr in
let resources' = change_pattern_matrices pdf tr2 page.Pdfpage.resources in
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'}
let rotate_contents ?(fast=false) r pdf range =
process_pages (rotate_page_contents ~fast None r pdf) pdf range
(* Return the pages from the pdf in the range, unordered. *)
let select_pages range pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
option_map (function n -> try Some (select n pages) with _ -> None) range
(* Upright functionality *)
(* If all pages are already upright, and the mediabox is (0,0)-based, do nothing
to save time. *)
let allupright range pdf =
let page_is_upright page =
page.Pdfpage.rotate = Pdfpage.Rotate0 &&
(let (minx, miny, _, _) = Pdf.parse_rectangle page.Pdfpage.mediabox in
minx < 0.001 && miny < 0.001 && minx > ~-.0.001 && miny > ~-.0.001)
in
not (mem false (map page_is_upright (select_pages range pdf)))
let upright_transform page =
let rotate =
Pdfpage.int_of_rotation page.Pdfpage.rotate
and cx, cy =
let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in
(minx +. maxx) /. 2., (miny +. maxy) /. 2.
in
Pdftransform.mkrotate (cx, cy) (rad_of_deg (~-.(float rotate)))
let transform_boxes tr pdf page =
let f (minx, miny, maxx, maxy) =
let minx, miny = Pdftransform.transform_matrix tr (minx, miny)
and maxx, maxy = Pdftransform.transform_matrix tr (maxx, maxy) in
(minx, miny, maxx, maxy)
in
change_boxes f pdf page
let transform_contents ?(fast=false) tr pdf page =
let transform_op = Pdfops.Op_cm tr in
let resources' = change_pattern_matrices pdf (Pdftransform.matrix_invert tr) page.Pdfpage.resources in
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'}
let upright ?(fast=false) range pdf =
if allupright range pdf then pdf else
let upright_page _ _ page =
let tr = upright_transform page in
let page = transform_boxes tr pdf page in
let page = transform_contents ~fast tr pdf page in
rectify_boxes ~fast pdf {page with Pdfpage.rotate = Pdfpage.Rotate0}
in
process_pages (upright_page pdf) pdf range
(* \section{Scale page data} *)
let scale_pdf ?(fast=false) sxsylist pdf range =
let scale_page pnum page =
let sx, sy = List.nth sxsylist (pnum - 1) in
let f (xmin, ymin, xmax, ymax) =
xmin *. sx, ymin *. sy, xmax *. sx, ymax *. sy
in
let page = change_boxes f pdf page
and matrix = Pdftransform.matrix_of_op (Pdftransform.Scale ((0., 0.), sx, sy)) in
let transform_op =
Pdfops.Op_cm matrix
and resources' =
change_pattern_matrices pdf (Pdftransform.matrix_invert matrix) page.Pdfpage.resources
in
Pdfpage.prepend_operators pdf ~fast [transform_op] {page with Pdfpage.resources = resources'}
in
process_pages scale_page pdf range
(* Scale to fit page of size x * y *)
let scale_to_fit_pdf ?(fast=false) input_scale xylist op pdf range =
let scale_page_to_fit pnum page =
let x, y = List.nth xylist (pnum - 1) in
let matrix =
let (minx, miny, maxx, maxy) =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
if maxx <= 0. || maxy <= 0. then failwith "Zero-sized pages are invalid" else
let fx = x /. maxx in let fy = y /. maxy in
let scale = fmin fx fy *. input_scale in
let trans_x = (x -. (maxx *. scale)) /. 2.
in let trans_y = (y -. (maxy *. scale)) /. 2. in
(Pdftransform.matrix_of_transform
[Pdftransform.Translate (trans_x, trans_y);
Pdftransform.Scale ((0., 0.), scale, scale)])
in
let page =
change_boxes
(function (minx, miny, maxx, maxy) -> 0., 0., x, y)
pdf page
in
Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast
{page with Pdfpage.resources = change_pattern_matrices pdf (Pdftransform.matrix_invert matrix) page.Pdfpage.resources}
in
process_pages scale_page_to_fit pdf range
(* Scale contents *)
let scale_page_contents ?(fast=false) scale position pdf _ page =
let (minx, miny, maxx, maxy) as box =
(* Use cropbox if available *)
Pdf.parse_rectangle
(match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> r
| None -> page.Pdfpage.mediabox)
in
let sx, sy, _ = calculate_position true 0. box Horizontal position in
let tx, ty =
match position with
| Top t -> 0., -.t
| TopLeft t -> t, -.t
| TopRight t -> 0., -.t
| Left t -> t, 0.
| BottomLeft t -> t, t
| Bottom t -> 0., t
| BottomRight t -> -.t, -.t
| Right t -> -.t, 0.
| _ -> 0., 0. (* centre it... FIXME: We will add a center position, eventually, for text and this... *)
in
let transform =
Pdftransform.matrix_of_transform
[Pdftransform.Translate (tx, ty);
Pdftransform.Scale ((sx, sy), scale, scale)]
in
let transform_op = Pdfops.Op_cm transform in
let resources' = change_pattern_matrices pdf transform page.Pdfpage.resources in
Pdfpage.prepend_operators pdf [transform_op] ~fast {page with Pdfpage.resources = resources'}
let scale_contents ?(fast=false) position scale pdf range =
process_pages (scale_page_contents ~fast scale position pdf) pdf range
(* \section{List annotations} *)
let get_annotation_string encoding pdf annot =
match Pdf.lookup_direct pdf "/Contents" annot with
| Some (Pdf.String s) -> encode_output encoding s
| _ -> ""
let print_annotation encoding pdf num s =
let s = get_annotation_string encoding pdf s in
match s with
| "" -> ()
| s ->
flprint (Printf.sprintf "Page %d: " num);
flprint s;
flprint "\n"
let list_page_annotations encoding pdf num page =
match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array annots) ->
iter (print_annotation encoding pdf num) (map (Pdf.direct pdf) annots)
| _ -> ()
let list_annotations encoding pdf =
let range = parse_pagespec pdf "all" in
iter_pages (list_page_annotations encoding pdf) pdf range
let get_annotations encoding pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
flatten
(map2
(fun page pagenumber ->
match Pdf.lookup_direct pdf "/Annots" page.Pdfpage.rest with
| Some (Pdf.Array annots) ->
let strings =
map (get_annotation_string encoding pdf) (map (Pdf.direct pdf) annots)
in
combine (many pagenumber (length strings)) strings
| _ -> [])
pages
(ilist 1 (length pages)))
let list_annotations_more pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
iter2
(fun page pagenumber ->
iter
(function annot ->
let print_annot annot =
let annot_type_string =
match annot.Pdfannot.subtype with
| Pdfannot.Stamp -> "Stamp"
| Pdfannot.Text -> "Text"
| Pdfannot.Link -> "Link"
| Pdfannot.FreeText -> "FreeText"
| Pdfannot.Line -> "Line"
| Pdfannot.Square -> "Square"
| Pdfannot.Circle -> "Circle"
| Pdfannot.Polygon -> "Polygon"
| Pdfannot.PolyLine -> "PolyLine"
| Pdfannot.Highlight -> "Highlight"
| Pdfannot.Underline -> "Underline"
| Pdfannot.Squiggly -> "Squiggly"
| Pdfannot.StrikeOut -> "StrikeOut"
| Pdfannot.Caret -> "Caret"
| Pdfannot.Ink -> "Ink"
| Pdfannot.Popup _ -> "Popup"
| Pdfannot.FileAttachment -> "FileAttachment"
| Pdfannot.Sound -> "Sound"
| Pdfannot.Movie -> "Movie"
| Pdfannot.Widget -> "Widget"
| Pdfannot.Screen -> "Screen"
| Pdfannot.PrinterMark -> "PrinterMark"
| Pdfannot.TrapNet -> "TrapNet"
| Pdfannot.Watermark -> "Watermark"
| Pdfannot.ThreeDee -> "ThreeDee"
| Pdfannot.Unknown -> "Unknown"
in let subject =
match annot.Pdfannot.subject with
| Some s -> s
| None -> ""
in let contents =
match annot.Pdfannot.annot_contents with
| Some s -> s
| None -> ""
in
Printf.printf "Page: %i\n" pagenumber;
Printf.printf "Subtype: %s\n" annot_type_string;
Printf.printf "Subject: %s\n" subject;
Printf.printf "Contents: %s\n" contents;
in
match annot.Pdfannot.subtype with
| Pdfannot.Popup annot -> print_annot annot
| _ -> print_annot annot
)
(Pdfannot.annotations_of_page pdf page))
pages
(ilist 1 (length pages));
flprint "" (* flush *)
(* Equalise the page lengths of two PDFs by chopping or extending the first one.
*)
let equalise_lengths a b =
let a' =
if Pdfpage.endpage a < Pdfpage.endpage b then
Pdfpage.change_pages false a
(Pdfpage.pages_of_pagetree a @
many (Pdfpage.blankpage Pdfpaper.a4) (Pdfpage.endpage b - Pdfpage.endpage a))
else if Pdfpage.endpage a > Pdfpage.endpage b then
Pdfpage.change_pages false a
(take (Pdfpage.pages_of_pagetree a) (Pdfpage.endpage b))
else a
in
a', b
(* Copy annotations *)
(* FIXME: Why does this chop the files to the same length? Should be able to
apply annotations from a longer file to a shorter? *)
(* Rewrite any annotation destinations to point to pages in the
destination file. This prevents pages being copied, and ensures the links are
correct Any Indirect link inside a /Dest is rewritten if in the table. If not
inside a /Dest, nothing is rewritten. *)
let rec renumber_in_dest table indest = function
Pdf.Indirect i ->
begin
try Pdf.Indirect (Hashtbl.find table i) with _ -> Pdf.Indirect i
end
| Pdf.Array a ->
Pdf.recurse_array (renumber_in_dest table indest) a
| Pdf.Dictionary d ->
Pdf.Dictionary
(List.map
(function
("/Dest", v) -> ("/Dest", renumber_in_dest table true v)
| (k, v) -> (k, renumber_in_dest table indest v))
d)
| x -> x
let renumber_in_object pdf objnum table =
Pdf.addobj_given_num
pdf (objnum, (renumber_in_dest table false (Pdf.lookup_obj pdf objnum)))
let copy_annotations_page topdf frompdf frompage topage =
match Pdf.lookup_direct frompdf "/Annots" frompage.Pdfpage.rest with
Some (Pdf.Array frompage_annots as annots) ->
let table =
hashtable_of_dictionary
(combine
(Pdf.page_reference_numbers frompdf)
(Pdf.page_reference_numbers topdf))
in
List.iter
(function
(* FIXME: We assume they are indirects. Must also do direct, though rare.*)
Pdf.Indirect x ->
(*Printf.printf "Copying annotation %s which is\n%s\n"
(Pdfwrite.string_of_pdf (Pdf.Indirect x))
(Pdfwrite.string_of_pdf (Pdf.direct frompdf (Pdf.Indirect
x)));*)
renumber_in_object frompdf x table
| _ -> ())
frompage_annots;
let objects_to_copy = Pdf.objects_referenced [] [] frompdf annots in
iter
(fun n ->
ignore (Pdf.addobj_given_num topdf (n, Pdf.lookup_obj frompdf n)))
objects_to_copy;
let topage_annots =
match Pdf.lookup_direct frompdf "/Annots" topage.Pdfpage.rest with
| Some (Pdf.Array annots) -> annots
| _ -> []
in
let merged_dict = Pdf.Array (frompage_annots @ topage_annots) in
let topage' =
{topage with Pdfpage.rest =
Pdf.add_dict_entry topage.Pdfpage.rest "/Annots" merged_dict}
in
topdf, topage'
| Some x -> topdf, topage
| None -> topdf, topage
let copy_annotations range frompdf topdf =
let frompdf, topdf = equalise_lengths frompdf topdf in
match Pdf.renumber_pdfs [frompdf; topdf] with
| [frompdf; topdf] ->
let frompdf_pages = Pdfpage.pages_of_pagetree frompdf in
let topdf_pages = Pdfpage.pages_of_pagetree topdf in
let pdf = ref topdf
and pages = ref []
and pnum = ref 1
and frompdf_pages = ref frompdf_pages
and topdf_pages = ref topdf_pages in
(* Go through, updating pdf and collecting new pages. *)
while not (isnull !frompdf_pages) do
let frompdf_page = hd !frompdf_pages
and topdf_page = hd !topdf_pages in
let pdf', page =
if mem !pnum range
then copy_annotations_page !pdf frompdf frompdf_page topdf_page
else !pdf, topdf_page
in
pdf := pdf';
pages =| page;
incr pnum;
frompdf_pages := tl !frompdf_pages;
topdf_pages := tl !topdf_pages
done;
Pdfpage.change_pages true !pdf (rev !pages)
| _ -> assert false
(* \section{N-up} *)
(* Given a number to fit and a mediabox, return a list of transforms for the
2 pages. FIXME: Assumes mediabox (0, 0)-based. Check this for all operations for 1.8. *)
let twoup_transforms mediabox =
let width, height =
match Pdf.parse_rectangle mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
let width_exceeds_height = width > height in
let rotate = Pdftransform.Rotate ((0., 0.), rad_of_deg 90.)
in let sc =
if width_exceeds_height
then fmin (height /. width) ((width /. 2.) /. height)
else fmin (width /. height) ((height /. 2.) /. width)
in
let scale = Pdftransform.Scale ((0., 0.), sc, sc) in
let tr0, tr1 =
if width_exceeds_height then
Pdftransform.Translate (height *. sc, 0.),
Pdftransform.Translate (height *. sc *. 2., 0.)
else
Pdftransform.Translate (height *. sc, 0.),
Pdftransform.Translate (height *. sc, width *. sc)
in
let t0 = Pdftransform.matrix_of_transform [tr0; rotate; scale]
in let t1 = Pdftransform.matrix_of_transform [tr1; rotate; scale] in
[t0; t1]
(* Combine two pages into one throughout the document. The pages have already
had their objects renumbered so as not to clash.*)
let twoup_pages pdf = function
| [] -> assert false
| (h::_) as pages ->
let resources' =
pair_reduce
(combine_pdf_resources pdf)
(map (fun p -> p.Pdfpage.resources) pages)
in
let content' =
let transform_stream clipbox contents transform =
let clipops =
let minx, miny, maxx, maxy = Pdf.parse_rectangle clipbox in
[Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny);
Pdfops.Op_W;
Pdfops.Op_n]
in
let ops = Pdfops.parse_operators pdf resources' contents in
(* Need protect_removeme here? especially new, Q-adding
* protect?. This will also make it faster on -fast, since Q
* adding will be disabled. *)
Pdfops.stream_of_ops
([Pdfops.Op_q] @ [Pdfops.Op_cm transform] @ clipops @ ops @ [Pdfops.Op_Q])
in
map2
(fun p ->
transform_stream
(match Pdf.lookup_direct pdf "/CropBox" p.Pdfpage.rest with
None -> p.Pdfpage.mediabox
| Some box -> box)
p.Pdfpage.content)
pages
(take (twoup_transforms h.Pdfpage.mediabox) (length pages))
in
{Pdfpage.mediabox = h.Pdfpage.mediabox;
Pdfpage.rotate = h.Pdfpage.rotate;
Pdfpage.content = content';
Pdfpage.resources = resources';
Pdfpage.rest = h.Pdfpage.rest}
let twoup_stack_transforms mediabox =
let width, height =
match Pdf.parse_rectangle mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
let rotate = Pdftransform.Rotate ((0., 0.), rad_of_deg 90.)
in let tr0 = Pdftransform.Translate (height, 0.)
in let tr1 = Pdftransform.Translate (height, width) in
let t0 = Pdftransform.matrix_of_transform [tr0; rotate]
in let t1 = Pdftransform.matrix_of_transform [tr1; rotate] in
[t0; t1]
(* FIXME: Add clipping, as for twoup, or merge these two functions properly *)
let twoup_pages_stack pdf = function
| [] -> assert false
| (h::_) as pages ->
let resources =
pair_reduce
(combine_pdf_resources pdf)
(map (fun p -> p.Pdfpage.resources) pages)
in
(* Remove any CropBox *)
let rest =
Pdf.remove_dict_entry h.Pdfpage.rest "/CropBox"
in
let content' =
let transform_stream clipbox contents transform =
let clipops =
let minx, miny, maxx, maxy = Pdf.parse_rectangle clipbox in
[Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny);
Pdfops.Op_W;
Pdfops.Op_n]
in
let ops = Pdfops.parse_operators pdf resources contents in
Pdfops.stream_of_ops
([Pdfops.Op_q] @ [Pdfops.Op_cm transform] @ clipops @ ops @ [Pdfops.Op_Q])
in
map2
(fun p ->
transform_stream
(match Pdf.lookup_direct pdf "/CropBox" p.Pdfpage.rest with
None -> p.Pdfpage.mediabox
| Some box -> box)
p.Pdfpage.content)
pages
(take (twoup_stack_transforms h.Pdfpage.mediabox) (length pages))
in
{Pdfpage.mediabox =
(let width, height =
match Pdf.parse_rectangle h.Pdfpage.mediabox with
xmin, ymin, xmax, ymax -> xmax -. xmin, ymax -. ymin
in
Pdf.Array [Pdf.Real 0.; Pdf.Real 0.; Pdf.Real height; Pdf.Real (width *. 2.)]);
Pdfpage.rotate = h.Pdfpage.rotate;
Pdfpage.content = content';
Pdfpage.resources = resources;
Pdfpage.rest = rest}
let f_twoup f_pages pdf =
let pagenums = ilist 1 (Pdfpage.endpage pdf) in
let pdf = upright pagenums pdf in
let pages = Pdfpage.pages_of_pagetree pdf in
let pagesets = splitinto 2 pages in
let renumbered = map (Pdfpage.renumber_pages pdf) pagesets in
let pages' = map (f_pages pdf) renumbered in
let changes = List.map (fun x -> (x, (x + 1) / 2)) pagenums in
(*print_changes changes;*)
Pdfpage.change_pages ~changes true pdf pages'
let twoup pdf = f_twoup twoup_pages pdf
let twoup_stack pdf = f_twoup twoup_pages_stack pdf
(* \section{Output info} *)
let get_info raw pdf =
let infodict =
match Pdf.lookup_direct pdf "/Info" pdf.Pdf.trailerdict with
| Some infodict -> infodict
| _ -> Pdf.Dictionary []
in
let getstring name =
match Pdf.lookup_direct pdf name infodict with
| Some (Pdf.String s) ->
if raw then s else crude_de_unicode s
| _ -> ""
in
getstring
let get_info_utf8 pdf =
let infodict =
match Pdf.lookup_direct pdf "/Info" pdf.Pdf.trailerdict with
| Some infodict -> infodict
| _ -> Pdf.Dictionary []
in
(function name ->
match Pdf.lookup_direct pdf name infodict with
| Some (Pdf.String s) -> Pdftext.utf8_of_pdfdocstring s
| _ -> "")
let getstring encoding pdf =
match encoding with
| Raw -> get_info true pdf
| Stripped -> get_info false pdf
| UTF8 -> get_info_utf8 pdf
let output_info encoding pdf =
let getstring = getstring encoding pdf in
Printf.printf "Version: %i.%i\n" pdf.Pdf.major pdf.Pdf.minor;
Printf.printf "Pages: %i\n" (Pdfpage.endpage pdf);
Printf.printf "Title: %s\n" (getstring "/Title");
Printf.printf "Author: %s\n" (getstring "/Author");
Printf.printf "Subject: %s\n" (getstring "/Subject");
Printf.printf "Keywords: %s\n" (getstring "/Keywords");
Printf.printf "Creator: %s\n" (getstring "/Creator");
Printf.printf "Producer: %s\n" (getstring "/Producer");
Printf.printf "Created: %s\n" (getstring "/CreationDate");
Printf.printf "Modified: %s\n" (getstring "/ModDate")
type xmltree =
E of Xmlm.tag * xmltree list
| D of string
let xmltree_of_bytes b =
let i = Xmlm.make_input (`String (0, string_of_bytes b)) in
let el tag childs = E (tag, childs)
and data d = D d in
Xmlm.input_doc_tree ~el ~data i
let rec string_of_xmltree = function
D d ->
Printf.sprintf "DATA {%s}" d
| E (tag, trees) ->
Printf.sprintf "ELT (%s, %s)"
(string_of_tag tag)
(string_of_xmltrees trees)
and string_of_tag ((n, n'), attributes) =
Printf.sprintf
"NAME |%s| |%s|, ATTRIBUTES {%s}" n n'
(string_of_attributes attributes)
and string_of_attribute ((n, n'), str) =
Printf.sprintf "ATTRNAME |%s| |%s|, STR {%s}" n n' str
and string_of_attributes attrs =
fold_left
(fun a b -> a ^ " " ^ b) "" (map string_of_attribute attrs)
and string_of_xmltrees trees =
fold_left
(fun a b -> a ^ " " ^ b) "" (map string_of_xmltree trees)
let adobe = "http://ns.adobe.com/pdf/1.3/"
let xmp = "http://ns.adobe.com/xap/1.0/"
let dc = "http://purl.org/dc/elements/1.1/"
let rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
(* For OCaml < 4.00 *)
let string_trim s =
implode
(dropwhile
Pdf.is_whitespace (rev (dropwhile Pdf.is_whitespace (explode s))))
let combine_with_spaces strs =
string_trim
(fold_left (fun x y -> x ^ (if x <> "" then ", " else "") ^ y) "" strs)
(* Collect all <li> elements inside a seq, bag, or alt. Combine with commas. If
none found, return empty string instead. *)
let collect_list_items = function
E (((n, n'), _), elts) when
n = rdf && (n' = "Alt" || n' = "Seq" || n' = "Bag")
->
combine_with_spaces
(option_map
(function
E (((n, n'), _), [D d]) when n = rdf && n' = "li" ->
Some d
| _ -> None)
elts)
| _ -> ""
let collect_list_items_all all =
match keep (function E _ -> true | _ -> false) all with
h::_ -> Some (collect_list_items h)
| [] -> None
let rec get_data_for namespace name = function
D _ -> None
| E (((n, n'), _), [D d]) when n = namespace && n' = name ->
Some d
| E (((n, n'), _), e) when n = namespace && n' = name ->
collect_list_items_all e
| E (_, l) ->
match option_map (get_data_for namespace name) l with
x :: _ -> Some x
| _ -> None
let output_xmp_info encoding pdf =
let print_out tree title namespace name =
match get_data_for namespace name tree with
None -> ()
| Some data ->
Printf.printf "%s: " title;
print_endline data
in
match get_metadata pdf with
None -> ()
| Some metadata ->
try
let dtd, tree = xmltree_of_bytes metadata in
print_out tree "XMP pdf:Keywords" adobe "Keywords";
print_out tree "XMP pdf:PDFVersion" adobe "PDFVersion";
print_out tree "XMP pdf:Producer" adobe "Producer";
print_out tree "XMP pdf:Trapped" adobe "Trapped";
print_out tree "XMP xmp:CreateDate" xmp "CreateDate";
print_out tree "XMP xmp:CreatorTool" xmp "CreatorTool";
print_out tree "XMP xmp:MetadataDate" xmp "MetadataDate";
print_out tree "XMP xmp:ModifyDate" xmp "ModifyDate";
print_out tree "XMP dc:title" dc "title";
print_out tree "XMP dc:creator" dc "creator";
print_out tree "XMP dc:subject" dc "subject"
with
_ -> ()
(* \section{Blacken text} *)
(*
\begin{verbatim}
Algorithm: Change
BT
<ops>
ET
...to...
BT
Op_g 0.
<ops minus any color, shading or gs operators>
ET
<ops minus any text positioning or text rendering ones>
\end{verbatim}
*)
let blacktext_ops (r, g, b) pdf resources content =
let not_text = function
| Pdfops.Op_Tj _ | Pdfops.Op_TJ _
| Pdfops.Op_' _ | Pdfops.Op_'' (_, _, _)
| Pdfops.Op_Td (_, _) | Pdfops.Op_TD (_, _)
| Pdfops.Op_Tm _ | Pdfops.Op_T'
| Pdfops.Op_Tc _
| Pdfops.Op_Tw _
| Pdfops.Op_Tz _
| Pdfops.Op_TL _
| Pdfops.Op_Tf (_, _)
| Pdfops.Op_Tr _
| Pdfops.Op_Ts _ -> false
| _ -> true
in let textlevel = ref 0
in let removed = ref []
in let operators =
Pdfops.parse_operators pdf resources content
in
let rec remove_colourops prev = function
| [] -> rev prev
| Pdfops.Op_BT::more ->
incr textlevel;
remove_colourops
(Pdfops.Op_rg (r, g, b)::Pdfops.Op_BT::prev)
more
| Pdfops.Op_ET::more ->
decr textlevel;
let prev' = !removed @ Pdfops.Op_ET::prev in
removed := [];
remove_colourops prev' more
| (Pdfops.Op_G _
| Pdfops.Op_g _
| Pdfops.Op_RG (_, _, _)
| Pdfops.Op_rg (_, _, _)
| Pdfops.Op_k (_, _, _, _)
| Pdfops.Op_K (_, _, _, _)
| Pdfops.Op_SCN _
| Pdfops.Op_SC _
| Pdfops.Op_scn _
| Pdfops.Op_sc _
| Pdfops.Op_SCNName (_, _)
| Pdfops.Op_scnName (_, _)
| Pdfops.Op_CS _
| Pdfops.Op_cs _
| Pdfops.Op_sh _
| Pdfops.Op_gs _)
as op::more ->
if !textlevel > 0
then
begin
removed =| op;
remove_colourops prev more
end
else remove_colourops (op::prev) more
| op::more ->
if !textlevel > 0 && not_text op then removed =| op;
remove_colourops (op::prev) more
in
let operators' = remove_colourops [] operators in
[Pdfops.stream_of_ops operators']
(* Blacken a form xobject, writing it to the same object. *)
let process_xobject f pdf resources i =
let xobj = Pdf.lookup_obj pdf i in
match Pdf.lookup_direct pdf "/Subtype" xobj with
| None -> raise (Pdf.PDFError "No /Subtype in Xobject")
| Some (Pdf.Name "/Form") ->
Pdf.getstream xobj;
begin match xobj with
| Pdf.Stream ({contents = Pdf.Dictionary dict, Pdf.Got bytes} as rf) ->
begin match f pdf resources [Pdf.Stream rf] with
| [Pdf.Stream {contents = (Pdf.Dictionary dict', data)}] ->
let dict' =
Pdf.remove_dict_entry
(Pdf.Dictionary (mergedict dict dict'))
"/Filter"
in
rf := (dict', data)
| _ -> assert false
end
| _ -> assert false (* getstream would have complained already *)
end
| Some _ -> ()
let process_xobjects pdf page f =
match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
| Some (Pdf.Dictionary elts) ->
iter
(fun (k, v) ->
match v with
| Pdf.Indirect i -> process_xobject f pdf page.Pdfpage.resources i
| _ -> raise (Pdf.PDFError "process_xobject"))
elts
| _ -> ()
let blacktext (r, g, b) range pdf =
let blacktext_page _ page =
let content' =
blacktext_ops (r, g, b) pdf page.Pdfpage.resources page.Pdfpage.content
in
process_xobjects pdf page (blacktext_ops (r, g, b));
{page with Pdfpage.content = content'}
in
process_pages blacktext_page pdf range
(* \section{Blacken lines} *)
let blacklines_ops (r, g, b) pdf resources content =
let rec blacken_strokeops prev = function
| [] -> rev prev
| Pdfops.Op_CS _::t ->
blacken_strokeops (Pdfops.Op_CS "/DeviceRGB"::prev) t
| (Pdfops.Op_SC _ | Pdfops.Op_SCN _ | Pdfops.Op_SCNName _ | Pdfops.Op_G _
| Pdfops.Op_RG _ | Pdfops.Op_K _)::t ->
blacken_strokeops (Pdfops.Op_RG (r, g, b)::prev) t
| h::t -> blacken_strokeops (h::prev) t
and operators =
Pdfops.parse_operators pdf resources content
in
let operators' = blacken_strokeops [] operators in
[Pdfops.stream_of_ops operators']
let blacklines (r, g, b) range pdf =
let blacklines_page _ page =
let content' =
blacklines_ops (r, g, b) pdf page.Pdfpage.resources page.Pdfpage.content
in
process_xobjects pdf page (blacklines_ops (r, g, b));
{page with Pdfpage.content = content'}
in
process_pages blacklines_page pdf range
(* \section{Blacken Fills} *)
let blackfills_ops (r, g, b) pdf resources content =
let rec blacken_fillops prev = function
| [] -> rev prev
| Pdfops.Op_cs _::t ->
blacken_fillops (Pdfops.Op_cs "/DeviceRGB"::prev) t
| (Pdfops.Op_sc _ | Pdfops.Op_scn _ | Pdfops.Op_scnName _ | Pdfops.Op_g _
| Pdfops.Op_rg _ | Pdfops.Op_k _)::t ->
blacken_fillops (Pdfops.Op_rg (r, g, b)::prev) t
| h::t -> blacken_fillops (h::prev) t
and operators =
Pdfops.parse_operators pdf resources content
in
let operators' = blacken_fillops [] operators in
[Pdfops.stream_of_ops operators']
let blackfills (r, g, b) range pdf =
let blackfills_page _ page =
let content' =
blackfills_ops (r, g, b) pdf page.Pdfpage.resources page.Pdfpage.content
in
process_xobjects pdf page (blackfills_ops (r, g, b));
{page with Pdfpage.content = content'}
in
process_pages blackfills_page pdf range
(* \section{Set a minimum line width to avoid dropout} *)
let thinlines range width pdf =
let thinpage _ page =
let operators =
Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content
in
let ctmstack = ref [ref Pdftransform.i_matrix] in
let scaleof_ctm () =
try
match Pdftransform.decompose (!(hd !ctmstack)) with
(scale, _, _, _, _, _) ->
scale
with
Failure _ (*"hd"*) -> 1.
in
let rec replace_operators prev = function
| [] -> rev prev
| (Pdfops.Op_w w)::more ->
(* Alter width. *)
let width' = width /. scaleof_ctm () in
let w' =
if w >= width' then Pdfops.Op_w w else Pdfops.Op_w width'
in
replace_operators (w'::prev) more
| (Pdfops.Op_cm m)::more ->
(* Update CTM *)
begin try
let top = hd !ctmstack in
top := Pdftransform.matrix_compose !top m
with
Failure _ (*"hd"*) -> error "Malformed file."
end;
replace_operators ((Pdfops.Op_cm m)::prev) more
| Pdfops.Op_q::more ->
(* Push stack *)
begin try
ctmstack =| ref (!(hd !ctmstack))
with
Failure _ (*"hd"*) -> error "Malformed file"
end;
replace_operators (Pdfops.Op_q::prev) more
| Pdfops.Op_Q::more ->
(* Pop stack *)
begin try
ctmstack := tl !ctmstack
with
Failure _ (*"tl"*) -> error "Malformed file"
end;
replace_operators (Pdfops.Op_Q::prev) more
| (Pdfops.Op_gs gsname)::more ->
(* Perhaps insert [Op_w]. *)
let opw =
match Pdf.lookup_direct pdf "/ExtGState" page.Pdfpage.resources with
| None -> []
| Some ext_state_dict ->
match Pdf.lookup_direct pdf gsname ext_state_dict with
| None -> []
| Some gdict ->
match Pdf.lookup_direct pdf "/LW" gdict with
| Some s -> (try [Pdfops.Op_w (Pdf.getnum s)] with _ -> [])
| None -> []
in
replace_operators (opw @ ((Pdfops.Op_gs gsname)::prev)) more
| x::more -> replace_operators (x::prev) more
in
let operators = replace_operators [] operators in
(* 2. Add an initial 'w' if width more than default width *)
let operators =
if width > 1. then (Pdfops.Op_w width)::operators else operators
in
let content' = [Pdfops.stream_of_ops operators] in
{page with Pdfpage.content = content'}
in
process_pages thinpage pdf range
(* \section{Remove annotations} *)
let remove_annotations range pdf =
let remove_annotations_page pagenum page =
if mem pagenum range then
let rest' =
Pdf.remove_dict_entry page.Pdfpage.rest "/Annots"
in
{page with Pdfpage.rest = rest'}
else
page
in
process_pages remove_annotations_page pdf range
(* \section{Making draft documents} *)
(* Predicate on an xobject: true if an image xobject. *)
let isimage pdf (_, xobj) =
match Pdf.lookup_direct pdf "/Subtype" xobj with
| Some (Pdf.Name "/Image") -> true
| _ -> false
(* Given a set of resources for a page, and the name of a resource, determine if
that name refers to an image xobject. *)
let xobject_isimage pdf resources name =
match resources with
| Pdf.Dictionary _ ->
begin match Pdf.lookup_direct pdf "/XObject" resources with
| Some xobjects ->
isimage pdf ("", Pdf.lookup_fail "xobject not there" pdf name xobjects)
| _ -> false
end
| _ -> failwith "bad resources"
(* The subsitute for an image. *)
let substitute boxes =
if boxes then
rev
[Pdfops.Op_q;
Pdfops.Op_w 0.;
Pdfops.Op_G 0.;
Pdfops.Op_re (0., 0., 1., 1.);
Pdfops.Op_m (0., 0.);
Pdfops.Op_l (1., 1.);
Pdfops.Op_m (0., 1.);
Pdfops.Op_l (1., 0.);
Pdfops.Op_S;
Pdfops.Op_Q]
else
[]
(* Remove references to images from a graphics stream. *)
let rec remove_images_stream boxes pdf resources prev = function
| [] -> rev prev
| (Pdfops.Op_Do name) as h::t ->
if xobject_isimage pdf resources name
then remove_images_stream boxes pdf resources (substitute boxes @ prev) t
else remove_images_stream boxes pdf resources (h::prev) t
| Pdfops.InlineImage _::t ->
remove_images_stream boxes pdf resources (substitute boxes @ prev) t
| h::t ->
remove_images_stream boxes pdf resources (h::prev) t
let rec process_form_xobject boxes pdf form =
let form = Pdf.direct pdf form in
let page =
{Pdfpage.content = [form];
Pdfpage.mediabox = Pdf.Null;
Pdfpage.resources =
begin match Pdf.lookup_direct pdf "/Resources" form with
| Some r -> r
| None -> Pdf.Dictionary []
end;
Pdfpage.rotate = Pdfpage.Rotate0;
Pdfpage.rest = Pdf.Dictionary []}
in
let page', pdf =
remove_images_page boxes pdf page
in
let form' =
match form with
| Pdf.Stream {contents = (dict, _)} ->
begin match
Pdfops.stream_of_ops
(Pdfops.parse_operators pdf (Pdf.Dictionary []) page'.Pdfpage.content)
with
| Pdf.Stream {contents = (_, Pdf.Got data)} ->
let dict' =
Pdf.add_dict_entry dict "/Length" (Pdf.Integer (bytes_size data))
in
Pdf.Stream {contents = (dict', Pdf.Got data)}
| _ -> assert false
end
| _ -> raise (Pdf.PDFError "not a stream")
in
form', pdf
(* Remove images from a page. *)
and remove_images_page boxes pdf page =
let isform pdf xobj =
match Pdf.lookup_direct pdf "/Subtype" xobj with Some (Pdf.Name "/Form") -> true | _ -> false
in
(* Remove image xobjects and look into form ones *)
let form_xobjects =
match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with
| Some (Pdf.Dictionary elts) ->
keep (function (_, p) -> isform pdf p) elts
| _ -> []
in
let resources', pdf =
let names, pointers = split form_xobjects in
let form_xobjects', pdf =
let pdf = ref pdf
in let outputs = ref [] in
iter
(fun p ->
let p', pdf' = process_form_xobject boxes !pdf p in
pdf := pdf';
outputs =| p')
pointers;
rev !outputs, !pdf
in
let nums = ref [] in
iter
(fun xobj ->
let objnum = Pdf.addobj pdf xobj in
nums =| objnum)
form_xobjects';
let newdict =
Pdf.Dictionary (combine names (map (fun x -> Pdf.Indirect x) (rev !nums)))
in
Pdf.add_dict_entry page.Pdfpage.resources "/XObject" newdict, pdf
in
let content' =
remove_images_stream boxes pdf page.Pdfpage.resources []
(Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content)
in
{page with
Pdfpage.content =
(let stream = Pdfops.stream_of_ops content' in
Pdfcodec.encode_pdfstream pdf Pdfcodec.Flate stream;
[stream]);
Pdfpage.resources = resources'}, pdf
(* Remove images from all pages in a document. *)
let draft boxes range pdf =
let pages = Pdfpage.pages_of_pagetree pdf in
let pagenums = indx pages in
let pdf = ref pdf
in let pages' = ref [] in
iter2
(fun p pagenum ->
let p', pdf' =
if mem pagenum range
then remove_images_page boxes !pdf p
else p, !pdf
in
pdf := pdf';
pages' =| p')
pages
pagenums;
Pdfpage.change_pages true !pdf (rev !pages')
let set_version v pdf =
pdf.Pdf.minor <- v
(* Custom Code: CSP1 - four up duplication. Alter media box and crop-box. 4-up the data. *)
let custom_csp1_page pdf _ page =
let minx, miny, maxx, maxy =
match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some r -> Pdf.parse_rectangle r
| None -> Pdf.parse_rectangle page.Pdfpage.mediabox
in
let mx0 = -.minx
in let my0 = -.miny
in let dx = maxx -. minx
in let dy = maxy -. miny in
let content =
let ops =
Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content
in
[Pdfops.Op_q;
Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (mx0, my0)])] @ ops @ [Pdfops.Op_Q] @
[Pdfops.Op_q;
Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (mx0 +. dx, my0 +. dy)])] @ ops @ [Pdfops.Op_Q] @
[Pdfops.Op_q;
Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (mx0, my0 +. dy)])] @ ops @ [Pdfops.Op_Q] @
[Pdfops.Op_q;
Pdfops.Op_cm (Pdftransform.matrix_of_transform [Pdftransform.Translate (mx0 +. dx, my0)])] @ ops @ [Pdfops.Op_Q]
in
let new_mediabox =
Pdf.Array
[Pdf.Real 0.;
Pdf.Real 0.;
Pdf.Real ((maxx -. minx) *. 2.);
Pdf.Real ((maxy -. miny) *. 2.)]
in
{page with
Pdfpage.content = [Pdfops.stream_of_ops content];
Pdfpage.mediabox = new_mediabox;
Pdfpage.rest = Pdf.add_dict_entry page.Pdfpage.rest "/CropBox" new_mediabox}
let custom_csp1 pdf =
process_pages (custom_csp1_page pdf) pdf (ilist 1 (Pdfpage.endpage pdf))
let custom_csp2 f pdf =
let page = hd (Pdfpage.pages_of_pagetree pdf) in
let m_minx, m_miny, m_maxx, m_maxy =
match page.Pdfpage.mediabox with
| Pdf.Array [a; b; c; d] ->
Pdf.getnum a, Pdf.getnum b, Pdf.getnum c, Pdf.getnum d
| _ -> 0., 0., 0., 0.
in
let c_minx, c_miny, c_maxx, c_maxy =
match Pdf.lookup_direct pdf "/CropBox" page.Pdfpage.rest with
| Some (Pdf.Array [a; b; c; d]) ->
Pdf.getnum a, Pdf.getnum b, Pdf.getnum c, Pdf.getnum d
| _ -> m_minx, m_miny, m_maxx, m_maxy
in
let x = (c_minx +. c_maxx) /. 2.
in let y = (c_miny +. c_maxy) /. 2. in
scale_contents (PosCentre (x, y)) (f /. 100.) pdf (ilist 1 (Pdfpage.endpage pdf))
let blank_document width height pages =
let pdf_pages =
map (fun () -> Pdfpage.blankpage (Pdfpaper.make Pdfunits.PdfPoint width height)) (many () pages)
in
let pdf, pageroot = Pdfpage.add_pagetree pdf_pages (Pdf.empty ()) in
Pdfpage.add_root pageroot [] pdf
let blank_document_paper papersize pages =
let pdf_pages =
map (fun () -> Pdfpage.blankpage papersize) (many () pages)
in
let pdf, pageroot = Pdfpage.add_pagetree pdf_pages (Pdf.empty ()) in
Pdfpage.add_root pageroot [] pdf
(* Split the given range (which is in order) into multiple contiguous ones. *)
let rec ranges_of_range curr prev = function
| [] -> begin match curr with [] -> rev prev | _ -> rev (rev curr::prev) end
| x::xs ->
match curr with
| [] -> ranges_of_range [x] prev xs
| c::cs when x = c + 1 -> ranges_of_range (x::curr) prev xs
| cs -> ranges_of_range [x] (rev cs::prev) xs
(* Predicate which is true if at least one page range starts at page 1 *)
let page1 labels =
mem true (map (function l -> l.Pdfpagelabels.startpage = 1) labels)
let add_page_labels pdf style prefix startval range =
let ranges = map extremes (ranges_of_range [] [] range)
and labels = Pdfpagelabels.read pdf in
let labels =
if not (page1 labels) then
ref
({Pdfpagelabels.labelstyle = Pdfpagelabels.DecimalArabic;
Pdfpagelabels.labelprefix = None;
Pdfpagelabels.startpage = 1;
Pdfpagelabels.startvalue = 1}::labels)
else
ref labels
in
iter
(function (s, e) ->
let label =
{Pdfpagelabels.labelstyle = style;
Pdfpagelabels.labelprefix = prefix;
Pdfpagelabels.startpage = s;
Pdfpagelabels.startvalue = startval}
in
labels := Pdfpagelabels.add_label (Pdfpage.endpage pdf) !labels label e)
ranges;
Pdfpagelabels.write pdf !labels
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