(* CPDF Core routines *) open Pdfutil open Pdfio open Cpdferror let debug = ref false let xmp_template = {| CREATEDATE MODDATE PRODUCER CREATOR TITLE SUBJECT AUTHOR KEYWORDS TRAPPED CREATEDATE CREATOR MODDATE METADATADATE TITLE |} (* 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 for the number of objects to not change *) let squeeze ?logto ?(pagedata=true) ?(recompress=true) 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; if pagedata then begin log (Printf.sprintf "Squeezing page data and xobjects\n"); squeeze_all_content_streams pdf; end; if recompress then begin log (Printf.sprintf "Recompressing document\n"); Pdfcodec.flate_level := 9; ignore (recompress_pdf pdf) end 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 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 time text m = match m with | [] -> Cpdfstrftime.strftime ~time text | (s, r)::t -> process_text time (string_replace_all_lazy s r text) t let expand_date = function | "now" -> begin match Sys.getenv_opt "CPDF_REPRODUCIBLE_DATES" with | Some "true" -> Cpdfstrftime.strftime ~time:Cpdfstrftime.dummy "D:%Y%m%d%H%M%S" | _ -> Cpdfstrftime.strftime "D:%Y%m%d%H%M%S" end | x -> x (* For uses of process_pages which don't need to deal with matrices, this function transforms into one which returns the identity matrix *) let ppstub f n p = (f n p, n, Pdftransform.i_matrix) let process_pages f pdf range = let pages = Pdfpage.pages_of_pagetree pdf in let pages', pagenumbers, matrices = (* new page objects, page number, matrix *) split3 (map2 (fun n p -> if mem n range then f n p else (p, n, Pdftransform.i_matrix)) (ilist 1 (length pages)) pages) in Pdfpage.change_pages ~matrices:(combine pagenumbers matrices) 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] (* 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' (* \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 fastrefnums endpage = function | [] -> true | {Pdfmarks.level = level; Pdfmarks.target = target}::more -> let page = Pdfpage.pagenumber_of_target pdf ~fastrefnums target in level < lastlevel + 2 && level >= 0 && page <= endpage && page >= 0 && verify_bookmarks pdf level fastrefnums endpage more let verify_bookmarks pdf lastlevel endpage marks = let refnums = Pdf.page_reference_numbers pdf in let fastrefnums = hashtable_of_dictionary (combine refnums (indx refnums)) in match marks with | [] -> true | m::more -> m.Pdfmarks.level = 0 && verify_bookmarks pdf lastlevel fastrefnums 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 debug_bookmark_string s = Printf.printf "STR: %s\n" s (* If optionaldest = [Pdfgenlex.LexString s], we parse the string, convert the * integer to an indirect of the real page target, and then put it in. *) let bookmark_of_data pdf i s i' isopen optionaldest = let target = match optionaldest with | [Pdfgenlex.LexString s] -> let pdfobj = Pdfread.parse_single_object s in (*Printf.printf "Parsed %s\n" (Pdfwrite.string_of_pdf pdfobj);*) begin match pdfobj with Pdf.Array (Pdf.Integer x::more) -> let pageobjnum = Pdfpage.page_object_number pdf i' in begin match pageobjnum with None -> raise (Pdf.PDFError "bookmark_of_data: page obj num not found") | Some p -> Pdfdest.read_destination pdf (Pdf.Array (Pdf.Indirect p::more)) end (* Need to deal with "null", "(string)", and "< Pdfdest.NullDestination | Pdf.String s -> Pdfdest.read_destination pdf (Pdf.String s) | x -> Pdfdest.Action x end | _ -> Pdfpage.target_of_pagenumber pdf i' in (*debug_bookmark_string s; debug_bookmark_string (implode (fixup_characters [] (explode s))); debug_bookmark_string (Pdftext.pdfdocstring_of_utf8 (implode (fixup_characters [] (explode s))));*) {Pdfmarks.level = i; Pdfmarks.text = Pdftext.pdfdocstring_of_utf8 (implode (fixup_characters [] (explode s))); Pdfmarks.target = target; Pdfmarks.isopen = isopen} let parse_bookmark_file verify pdf input = let currline = ref 0 in try let lines = Pdfio.read_lines input in 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"::optionaldest -> bookmarks =| bookmark_of_data pdf i s i' true optionaldest | Pdfgenlex.LexInt i::Pdfgenlex.LexString s::Pdfgenlex.LexInt i'::optionaldest -> bookmarks =| bookmark_of_data pdf i s i' false optionaldest | [] -> () (* 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 e -> error (Printf.sprintf "Bad bookmark file (syntax) at line %i (error was %s)" !currline (Printexc.to_string e)) 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 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 *) let output_string_of_target pdf fastrefnums x = match Pdfdest.pdfobject_of_destination x with | Pdf.Array (_::more) -> let a = Pdf.Array (Pdf.Integer (Pdfpage.pagenumber_of_target ~fastrefnums pdf x)::more) in "\"" ^ Pdfwrite.string_of_pdf a ^ "\"" | x -> "\"" ^ Pdfwrite.string_of_pdf x ^ "\"" (* List the bookmarks, optionally deunicoding the text, in the given range to the given output *) let list_bookmarks encoding range pdf output = let process_stripped escaped = let b = Buffer.create 200 in iter (fun x -> if x <= 127 then Buffer.add_char b (char_of_int x)) escaped; Buffer.contents b in let process_string s = let rec replace c x y = function | [] -> [] | h::t when h = c -> x::y::replace c x y t | h::t -> h::replace c x y 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 q bs q (replace nl bs n (replace bs bs bs codepoints)) in match encoding with | UTF8 -> Pdftext.utf8_of_codepoints escaped | Stripped -> process_stripped escaped | Raw -> s in let bookmarks = Pdfmarks.read_bookmarks pdf in let refnums = Pdf.page_reference_numbers pdf in let rangetable = hashset_of_list range in let range_is_all = range = ilist 1 (Pdfpage.endpage pdf) in let fastrefnums = hashtable_of_dictionary (combine refnums (indx refnums)) in (* Find the pagenumber of each bookmark target. If it is in the range, * keep that bookmark. Also keep the bookmark if its target is the null * destination. *) let inrange = keep (function x -> range_is_all || x.Pdfmarks.target = Pdfdest.NullDestination || (match x.Pdfmarks.target with Pdfdest.NamedDestinationElsewhere _ -> true | _ -> false) || Hashtbl.mem rangetable (Pdfpage.pagenumber_of_target ~fastrefnums pdf x.Pdfmarks.target)) bookmarks in let calculate_page_number mark = (* Some buggy PDFs use integers for page numbers instead of page * object references. Adobe Reader and Preview seem to support * this, for presumably historical reasons. So if we see a * OtherDocPageNumber (which is what Pdfdest parses these as, * because that's what they are legitimately, we use this as the * page number. It is zero based, though, and we are one-based, so * we add one. Pdfpage.pagenumber_of_target has been modified to support this.*) Pdfpage.pagenumber_of_target ~fastrefnums pdf mark.Pdfmarks.target in iter (function mark -> output.Pdfio.output_string (Printf.sprintf "%i \"%s\" %i%s %s\n" mark.Pdfmarks.level (process_string mark.Pdfmarks.text) (calculate_page_number mark) (if mark.Pdfmarks.isopen then " open" else "") (output_string_of_target pdf fastrefnums mark.Pdfmarks.target))) 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 _ = let refnums = Pdf.page_reference_numbers pdf in let fastrefnums = hashtable_of_dictionary (combine refnums (indx refnums)) in match keep (function m -> n = Pdfpage.pagenumber_of_target ~fastrefnums pdf m.Pdfmarks.target && m.Pdfmarks.level <= splitlevel) marks with | {Pdfmarks.text = title}::_ -> remove_unsafe_characters title | _ -> "" (* 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 = let refnums = Pdf.page_reference_numbers pdf in let fastrefnums = hashtable_of_dictionary (combine refnums (indx refnums)) in setify_preserving_order (option_map (function l when l.Pdfmarks.level = level -> Some (Pdfpage.pagenumber_of_target ~fastrefnums 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 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.} *) (* 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] type justification = LeftJustify | CentreJustify | RightJustify (* 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 j = let open Cpdfposition in match j with | 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 = map (fun (x, y) -> (y, x)) Pdfglyphlist.name_to_win in 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 shift pdf = let time = Cpdfstrftime.current_time () in let endpage = Pdfpage.endpage pdf in let replace_pairs pdf filename bates batespad num page = [ "%PageDiv2", (fun () -> string_of_int ((num + 1) / 2)); "%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 shifts = Cpdfcoord.parse_coordinates pdf shift in let addtext_page num page = let shift_x, shift_y = List.nth shifts (num - 1) in 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 time 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 time 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 = Cpdfposition.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 +. shift_x) (y +. shift_y) rotate (hoffset +. joffset) voffset outline linewidth unique_fontname unique_extgstatename colour fontsize text | None -> ops longest_w metrics (x +. shift_x) (y +. shift_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 (ppstub 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 shift 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 = let open Cpdfposition in 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 = Cpdfposition.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 shift !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 (ppstub 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 = iter (fun (f, t) -> Printf.printf "%i --> %i\n" f t) let pad_with_pdf (range : int list) (pdf : Pdf.t) (isbefore : bool) (padfile : Pdf.t) = let range = sort compare (setify range) in let merged = Pdfmerge.merge_pdfs false false ["a"; "b"] [pdf; padfile] [ilist 1 (Pdfpage.endpage pdf); ilist 1 (Pdfpage.endpage padfile)] in let original_pages, padpages = cleave (Pdfpage.pages_of_pagetree merged) (Pdfpage.endpage pdf) in let newpages = map (fun (pagenum, page) -> if mem pagenum range then (if isbefore then padpages @ [page] else [page] @ padpages) else [page]) (combine (indx original_pages) original_pages) in (* FIXME Provide ~changes here? *) Pdfpage.change_pages false merged (flatten newpages) let pad padwith range pdf isbefore = match padwith with Some padfile -> pad_with_pdf range pdf isbefore padfile | None -> 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 = Pdf.remove_dict_entry ((select (n + i) pages).Pdfpage.rest) "/Annots"}) range in let pages' = insert_after_many pages (combine range blankpages) in let changes = insert_after_many_changes isbefore 1 0 (map (fun x -> x + i) range) (ilist 1 (length pages)) in Pdfpage.change_pages ~changes true pdf pages' let padafter ?padwith 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 padwith range pdf false let padbefore ?padwith 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 padwith (map pred range) pdf true let padmultiple n pdf = let neg, n = n < 0, if n < 0 then -n else n in 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 = Pdf.Dictionary []} pages_to_add in let changes = map (fun x -> (x, x)) (ilist 1 (length pages)) in Pdfpage.change_pages ~changes true pdf (if neg then blankpages @ pages else 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'} 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 | _ -> () (* The content transformed by altering any use of [Op_cm]. But we must also alter any /Matrix entries in pattern dictionaries *) let change_pattern_matrices_resources pdf tr resources = try begin match Pdf.lookup_direct pdf "/Pattern" resources with | Some (Pdf.Dictionary patterns) -> let entries = map (fun (name, p) -> (*Printf.printf "Changing matrices of pattern %s\n" name;*) 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.Indirect (Pdf.addobj pdf new_pattern)) patterns in Pdf.add_dict_entry resources "/Pattern" (Pdf.Dictionary entries) | _ -> resources end with Pdftransform.NonInvertable -> Printf.eprintf "Warning: noninvertible matrix\n%!"; resources let change_pattern_matrices_page pdf tr page = let page = {page with Pdfpage.resources = change_pattern_matrices_resources pdf tr page.Pdfpage.resources} in match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with | Some (Pdf.Dictionary elts) -> iter (fun (k, v) -> match v with | Pdf.Indirect i -> (* Check if it's a form XObject. If so, rewrite its resources and add back as same number. *) begin match Pdf.lookup_direct pdf "/Subtype" v with | Some (Pdf.Name "/Form") -> (*Printf.printf "Processing form xobject %s for patterns\n" k; *) let form_xobject = Pdf.lookup_obj pdf i in begin match Pdf.lookup_direct pdf "/Resources" form_xobject with | Some resources -> let form_xobject' = Pdf.add_dict_entry form_xobject "/Resources" (change_pattern_matrices_resources pdf tr resources) in Pdf.addobj_given_num pdf (i, form_xobject') | _ -> () end | _ -> () end; | _ -> raise (Pdf.PDFError "change_pattern_matrices_page")) elts; page | _ -> page let transform_rect transform rect = let minx, miny, maxx, maxy = Pdf.parse_rectangle rect in let (x0, y0) = Pdftransform.transform_matrix transform (minx, miny) in let (x1, y1) = Pdftransform.transform_matrix transform (maxx, maxy) in let (x2, y2) = Pdftransform.transform_matrix transform (minx, maxy) in let (x3, y3) = Pdftransform.transform_matrix transform (maxx, miny) in let minx = fmin (fmin x0 x1) (fmin x2 x3) in let miny = fmin (fmin y0 y1) (fmin y2 y3) in let maxx = fmax (fmax x0 x1) (fmax x2 x3) in let maxy = fmax (fmax y0 y1) (fmax y2 y3) in Pdf.Array [Pdf.Real minx; Pdf.Real miny; Pdf.Real maxx; Pdf.Real maxy] (* This is used to transform the BBox inside a form xobject representing an * annotation appearance.*) (*let transform_xobject_in_place pdf transform i = Printf.printf "transforming xobject %i as part of annotation\n" i; let obj = Pdf.lookup_obj pdf i in match Pdf.lookup_direct pdf "/BBox" obj with | Some bbox -> Printf.printf "Found bbox %s\n" (Pdfwrite.string_of_pdf bbox); let obj = Pdf.add_dict_entry obj "/BBox" (transform_rect transform bbox) in Pdf.addobj_given_num pdf (i, obj) | None -> ()*) (* Apply transformations to any annotations in /Annots (i.e their /Rect entries) *) let transform_annotations pdf transform rest = (*Printf.printf "in transform_annotations with transform %s\n" (Pdftransform.string_of_matrix transform);*) match Pdf.lookup_direct pdf "/Annots" rest with | Some (Pdf.Array annots) -> (* Always indirect references, so alter in place *) iter (function | Pdf.Indirect i -> (*Printf.printf "Found an annotation to modify...\n";*) let annot = Pdf.lookup_obj pdf i in let rect' = match Pdf.lookup_direct pdf "/Rect" annot with Some rect -> transform_rect transform rect | None -> raise (Pdf.PDFError "transform_annotations: no rect") in (*let ap' = match Pdf.lookup_direct pdf "/AP" annot with None -> None | Some dict -> Some dict in*) let annot = Pdf.add_dict_entry annot "/Rect" rect' in (*begin match ap' with None -> () | Some (Pdf.Dictionary dict) -> (* Each entry in the dictionary is either * a) an indirect reference to a stream Form XObject * b) a direct or indirect dictionary with some entries, * each of which is an indirect reference to a stream. *) (* We do this in place. *) (* Make sure we never do an object more than once -- is this possible in a valid PDF anyway? *) let seen_nums = Hashtbl.create 128 in List.iter (fun (k, v) -> match v with Pdf.Indirect i -> if Hashtbl.find_opt seen_nums i = None then begin Printf.printf "%i not in hash table\n" i; Hashtbl.add seen_nums i (); transform_xobject_in_place pdf transform i end | _ -> let dict = Pdf.lookup_direct pdf k (Pdf.Dictionary dict) in match dict with Some (Pdf.Dictionary dict) -> List.iter (fun (_, v) -> match v with Pdf.Indirect i -> if Hashtbl.find_opt seen_nums i = None then begin Printf.printf "%i not in hash table\n" i; Hashtbl.add seen_nums i (); transform_xobject_in_place pdf transform i end | _ -> Printf.eprintf "Malformed /AP structure b%\n!"; ()) dict | _ -> Printf.eprintf "Malformed /AP structure c\n%!"; ()) dict | _ -> Printf.eprintf "Malformed /AP structure\n%!"; () end;*) Pdf.addobj_given_num pdf (i, annot) | _ -> Printf.eprintf "transform_annotations: not indirect\n%!") annots | _ -> () 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 page = change_pattern_matrices_page pdf (Pdftransform.mktranslate ~-.dx ~-.dy) page in transform_annotations pdf (Pdftransform.mktranslate dx dy) page.Pdfpage.rest; (Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, Pdftransform.mktranslate dx dy) 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 begin let p, _, _ = shift_page ~fast [(-.minx),(-.miny)] pdf 1 page in p end else page (* \section{Flip pages} *) let flip_page ?(fast=false) transform_op pdf pnum page = let minx, miny, maxx, maxy = Pdf.parse_rectangle page.Pdfpage.mediabox in let tr = transform_op minx miny maxx maxy in let page = change_pattern_matrices_page pdf tr page in transform_annotations pdf tr page.Pdfpage.rest; (Pdfpage.prepend_operators pdf [Pdfops.Op_cm tr] ~fast page, pnum, tr) 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 let open Cpdfposition 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 matrix = (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 transform_annotations pdf matrix o.Pdfpage.rest; let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in change_pattern_matrices_page pdf matrix r 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 matrix = (Pdftransform.matrix_of_transform ((if relative_to_cropbox then [Pdftransform.Translate (txmin, tymin)] else []) @ [Pdftransform.Translate (dx, dy)])) in transform_annotations pdf matrix o.Pdfpage.rest; let r = Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast o in change_pattern_matrices_page pdf matrix r 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 = 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 (combine marks_refnumbers new_refnumbers) in let new_marks = map (change_bookmark changetable) marks in Pdfmarks.add_bookmarks new_marks changed let add_xobject_to_page xobjname xobjnum page pdf = let resources' = let xobjects = match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with | Some xobjects -> xobjects | _ -> Pdf.Dictionary [] in let new_xobjects = Pdf.add_dict_entry xobjects xobjname (Pdf.Indirect xobjnum) in Pdf.add_dict_entry page.Pdfpage.resources "/XObject" new_xobjects in {page with Pdfpage.resources = resources'} let add_page_as_xobject pdf range page name = let xobject_data = match Pdfops.stream_of_ops (Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content) with Pdf.Stream {contents = (_, Got b)} -> b | _ -> assert false in let xobject_dict = ["/Type", Pdf.Name "/XObject"; "/Subtype", Pdf.Name "/Form"; "/BBox", page.Pdfpage.mediabox; "/Resources", page.Pdfpage.resources; "/Length", Pdf.Integer (bytes_size xobject_data)] in let xobject = Pdf.Stream {contents = (Pdf.Dictionary xobject_dict, Pdf.Got xobject_data)} in let xobject_objnum = Pdf.addobj pdf xobject in let pages = Pdfpage.pages_of_pagetree pdf in let new_pages = List.map2 (fun page pnum -> if mem pnum range then add_xobject_to_page name xobject_objnum page pdf else page) pages (indx pages) in Pdfpage.change_pages true pdf new_pages (* n.b the use of change_pages here ensures no inheritable resources in the * stamp, therefore creation of xobject from page is as simple as expected. *) let stamp_as_xobject pdf range over = 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 = under_pages in let changed = let changes = 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 (combine marks_refnumbers new_refnumbers) in let new_marks = map (change_bookmark changetable) marks in let pdf = Pdfmarks.add_bookmarks new_marks changed in let name = "/" ^ Pdfpage.shortest_unused_prefix pdf ^ "CPDFXObj" in (add_page_as_xobject pdf range over_page name, name) (* 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 = 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 = 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 = 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 (ppstub crop_page) pdf range (* Just used by cpdflib for historical reasons *) 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 (ppstub set_box_page) pdf range (* \section{Cropping} *) let crop_pdf ?(box="/CropBox") xywhlist pdf range = let crop_page pagenum page = {page with Pdfpage.rest = (Pdf.add_dict_entry page.Pdfpage.rest box (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 (ppstub crop_page) pdf range (* Clip a page to one of its boxes, or the media box if that box is not * present. This is a hard clip, done by using a clipping rectangle, so that * the page may then be used as a stamp without extraneous material reapearing. * *) let hard_box pdf range boxname mediabox_if_missing fast = process_pages (ppstub (fun pagenum page -> let minx, miny, maxx, maxy = if boxname = "/MediaBox" then Pdf.parse_rectangle page.Pdfpage.mediabox else match Pdf.lookup_direct pdf boxname page.Pdfpage.rest with | Some a -> Pdf.parse_rectangle a | _ -> if mediabox_if_missing then Pdf.parse_rectangle page.Pdfpage.mediabox else error (Printf.sprintf "hard_box: box %s not found" boxname) in let ops = [Pdfops.Op_re (minx, miny, maxx -. minx, maxy -. miny); Pdfops.Op_W; Pdfops.Op_n] in Pdfpage.prepend_operators pdf ops ~fast:fast 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 (ppstub 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 (ppstub 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 (ppstub 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 (ppstub 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 (ppstub 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 (ppstub rotate_page_by) pdf range let rotate_page_contents ~fast rotpoint r pdf pnum 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 page = change_pattern_matrices_page pdf tr2 page in transform_annotations pdf tr page.Pdfpage.rest; (Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, tr) 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 page = change_pattern_matrices_page pdf (Pdftransform.matrix_invert tr) page in transform_annotations pdf tr page.Pdfpage.rest; Pdfpage.prepend_operators pdf [transform_op] ~fast page let upright ?(fast=false) range pdf = if allupright range pdf then pdf else let upright_page _ pnum 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}, pnum, tr) 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 page = change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page in transform_annotations pdf matrix page.Pdfpage.rest; (Pdfpage.prepend_operators pdf ~fast [transform_op] page, pnum, matrix) in process_pages scale_page pdf range (* Scale to fit page of size x * y *) let scale_to_fit_pdf ?(fast=false) position 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 = match position with Cpdfposition.Left _ -> 0. | Cpdfposition.Right _ -> (x -. (maxx *. scale)) | _ -> (x -. (maxx *. scale)) /. 2. and trans_y = match position with | Cpdfposition.Top _ -> (y -. (maxy *. scale)) | Cpdfposition.Bottom _ -> 0. | _ -> (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 transform_annotations pdf matrix page.Pdfpage.rest; (Pdfpage.prepend_operators pdf [Pdfops.Op_cm matrix] ~fast (change_pattern_matrices_page pdf (Pdftransform.matrix_invert matrix) page), pnum, matrix) in process_pages scale_page_to_fit pdf range (* Scale contents *) let scale_page_contents ?(fast=false) scale position pdf pnum 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, _ = Cpdfposition.calculate_position true 0. box Horizontal position in let tx, ty = let open Cpdfposition in 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 page = change_pattern_matrices_page pdf transform page in transform_annotations pdf transform page.Pdfpage.rest; (Pdfpage.prepend_operators pdf [transform_op] ~fast page, pnum, transform) 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 = Cpdfpagespec.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 (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 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. *) 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] 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] (* Union two rest dictionaries from the same PDF. *) let combine_pdf_rests 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 keys_to_combine = ["/Annots"] in let combine_entries key = let a_entries = match Pdf.lookup_direct pdf key a with | Some (Pdf.Array d) -> d | _ -> [] in let b_entries = match Pdf.lookup_direct pdf key b with | Some (Pdf.Array d) -> d | _ -> [] in if a_entries = [] && b_entries = [] then None else Some (key, Pdf.Array (a_entries @ b_entries)) in let unknown_keys_a = lose (fun (k, _) -> mem k keys_to_combine) a_entries in let unknown_keys_b = lose (fun (k, _) -> mem k keys_to_combine) b_entries in let combined_known_entries = option_map combine_entries keys_to_combine in Pdf.Dictionary (unknown_keys_a @ unknown_keys_b @ combined_known_entries) (* Combine two pages into one throughout the document. The pages have already had their objects renumbered so as not to clash.*) let twoup_pages_inner isstack fast pdf = function | [] -> assert false | (h::_) as pages -> let transforms = take (((if isstack then twoup_stack_transforms else twoup_transforms) h.Pdfpage.mediabox)) (length pages) in (* Change the pattern matrices before combining resources *) let pages, h = let r = map2 (fun p t -> change_pattern_matrices_page pdf t p) pages transforms in r, List.hd r in let resources' = pair_reduce (combine_pdf_resources pdf) (map (fun p -> p.Pdfpage.resources) pages) in let rest' = pair_reduce (combine_pdf_rests pdf) (map (fun p -> p.Pdfpage.rest) 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 (* If fast, no q/Q protection and no parsing of operators. *) if fast then let before = Pdfops.stream_of_ops (Pdfops.Op_q::Pdfops.Op_cm transform::clipops) in let after = Pdfops.stream_of_ops [Pdfops.Op_Q] in [before] @ contents @ [after] else (* If slow, use protect from Pdfpage. *) let ops = Pdfpage.protect pdf resources' contents @ Pdfops.parse_operators pdf resources' contents in [Pdfops.stream_of_ops ([Pdfops.Op_q] @ [Pdfops.Op_cm transform] @ clipops @ ops @ [Pdfops.Op_Q])] in flatten (map2 (fun p t -> transform_annotations pdf t p.Pdfpage.rest; transform_stream (match Pdf.lookup_direct pdf "/CropBox" p.Pdfpage.rest with None -> p.Pdfpage.mediabox | Some box -> box) p.Pdfpage.content t) pages transforms) in {Pdfpage.mediabox = if isstack then 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.)] else h.Pdfpage.mediabox; Pdfpage.rotate = h.Pdfpage.rotate; Pdfpage.content = content'; Pdfpage.resources = resources'; Pdfpage.rest = if isstack then Pdf.remove_dict_entry rest' "/CropBox" else 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 = map (fun x -> (x, (x + 1) / 2)) pagenums in (*print_changes changes;*) Pdfpage.change_pages ~changes true pdf pages' let twoup fast pdf = f_twoup (twoup_pages_inner false fast) pdf let twoup_stack fast pdf = f_twoup (twoup_pages_inner true fast) 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 | Some (Pdf.Boolean false) -> "False" | Some (Pdf.Boolean true) -> "True" | _ -> if name = "/Trapped" then "False" else "" 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 | Some (Pdf.Boolean false) -> "False" | Some (Pdf.Boolean true) -> "True" | _ -> if name = "/Trapped" then "False" else "") 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"); Printf.printf "Trapped: %s\n" (getstring "/Trapped") type xmltree = E of Cpdfxmlm.tag * xmltree list | D of string let xmltree_of_bytes b = let i = Cpdfxmlm.make_input (`String (0, string_of_bytes b)) in let el tag childs = E (tag, childs) and data d = D d in Cpdfxmlm.input_doc_tree ~el ~data i let bytes_of_xmltree t = let buf = Buffer.create 1024 in let o = Cpdfxmlm.make_output (`Buffer buf) in let frag = function E (tag, childs) -> `El (tag, childs) | D d -> `Data d in Cpdfxmlm.output_doc_tree frag o t; bytes_of_string (Buffer.contents buf) 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#" let combine_with_spaces strs = String.trim (fold_left (fun x y -> x ^ (if x <> "" then ", " else "") ^ y) "" strs) (* Collect all
  • 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:Producer" adobe "Producer"; print_out tree "XMP pdf:Trapped" adobe "Trapped"; print_out tree "XMP pdf:Title" adobe "Title"; print_out tree "XMP pdf:Creator" adobe "Creator"; print_out tree "XMP pdf:Subject" adobe "Subject"; print_out tree "XMP pdf:Author" adobe "Author"; print_out tree "XMP pdf:CreationDate" adobe "CreationDate"; print_out tree "XMP pdf:ModDate" adobe "ModDate"; 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"; print_out tree "XMP dc:description" dc "description" with _ -> () (* Get XMP info equivalent of an old metadata field *) let check = function "/Title" -> [(adobe, "Title"); (dc, "title")] | "/Author" -> [(adobe, "Author"); (dc, "creator")] | "/Subject" -> [(adobe, "Subject"); (dc, "subject")] | "/Keywords" -> [(adobe, "Keywords")] | "/Creator" -> [(adobe, "Creator"); (xmp, "CreatorTool")] | "/Producer" -> [(adobe, "Producer")] | "/CreationDate" -> [(adobe, "CreationDate"); (xmp, "CreateDate")] | "/ModDate" -> [(adobe, "ModificationDate"); (xmp, "ModifyDate")] | _ -> failwith "Cpdf.check_name not known" let get_xmp_info pdf name = let tocheck = check name in match get_metadata pdf with None -> "" | Some metadata -> try let _, tree = xmltree_of_bytes metadata in let results = map (fun (kind, key) -> match get_data_for kind key tree with Some x -> x | None -> "") tocheck in match lose (eq "") results with x::_ -> x | [] -> "" with _ -> "" (* Set XMP info *) let rec set_xml_field kind fieldname value = function D data -> D data | E (((n, n'), m), _ (*[D _]*)) when n = kind && n' = fieldname -> (* Replace anything inside, including nothing i.e *) E (((n, n'), m), [D value]) | E (x, ts) -> E (x, map (set_xml_field kind fieldname value) ts) let set_pdf_info_xml kind fieldname value xmldata pdf = let dtd, tree = xmltree_of_bytes xmldata in let str = match value with Pdf.String s -> s | Pdf.Boolean true -> "True" | Pdf.Boolean false -> "False" | _ -> failwith "set_pdf_info_xml: not a string" in let newtree = set_xml_field kind fieldname str tree in bytes_of_xmltree (dtd, newtree) let set_pdf_info_xml_many changes value xmldata pdf = let xmldata = ref xmldata in iter (fun (kind, fieldname) -> xmldata := set_pdf_info_xml kind fieldname value !xmldata pdf) changes; !xmldata (* \section{Set an entry in the /Info dictionary} *) (* We must parse the date to get its components, then use strftime to build the * new string in XMP format *) type date = {mutable year : int; mutable month : int; (* 1 - 12 *) mutable day : int; (* 1 - 31 *) mutable hour : int; (* 0 - 23 *) mutable minute : int; (* 0 - 59 *) mutable second : int; (* 0 - 59 *) mutable ut_relationship : int; (* -1, 0, +1 *) mutable offset_hours : int; (* 0 - 59 *) mutable offset_minutes : int (* 0 - 59 *)} let default_date () = {year = 0; month = 1; day = 1; hour = 0; minute = 0; second = 0; ut_relationship = 0; offset_hours = 0; offset_minutes = 0} (* XMP date format is YYYY-MM-DDThh:mm:ssTZD *) let make_xmp_date_from_components d = let tzd = if d.ut_relationship = 0 && d.offset_hours = 0 && d.offset_minutes = 0 then "Z" else (if d.ut_relationship >=0 then "+" else "-") ^ Printf.sprintf "%02i" d.offset_hours ^ ":" ^ Printf.sprintf "%02i" d.offset_minutes in Cpdfstrftime.strftime ~time:{Cpdfstrftime._tm_sec = d.second; Cpdfstrftime._tm_min = d.minute; Cpdfstrftime._tm_hour = d.hour; Cpdfstrftime._tm_mday = d.day; Cpdfstrftime._tm_mon = d.month - 1; Cpdfstrftime._tm_year = d.year - 1900; Cpdfstrftime._tm_wday = 0; Cpdfstrftime._tm_yday = 0; Cpdfstrftime._tm_isdst = false} "%Y-%m-%dT%H:%M:%S" ^ tzd let xmp_date date = let d = default_date () in try match explode date with 'D'::':'::r -> begin match r with y1::y2::y3::y4::r -> d.year <- int_of_string (implode [y1; y2; y3; y4]); begin match r with m1::m2::r -> d.month <- int_of_string (implode [m1; m2]); begin match r with d1::d2::r -> d.day <- int_of_string (implode [d1; d2]); begin match r with h1::h2::r -> d.hour <- int_of_string (implode [h1; h2]); begin match r with m1::m2::r -> d.minute <- int_of_string (implode [m1; m2]); begin match r with s1::s2::r -> d.second <- int_of_string (implode [s1; s2]); begin match r with o::r -> d.ut_relationship <- if o = '+' then 1 else if o = '-' then -1 else 0; begin match r with h1::h2::'\''::r -> d.offset_hours <- int_of_string (implode [h1; h2]); begin match r with m1::m2::_ -> d.offset_minutes <- int_of_string (implode [m1; m2]); raise Exit | _ -> raise Exit end | _ -> raise Exit end | _ -> raise Exit end | _ -> raise Exit end | _ -> raise Exit end | _ -> raise Exit end | _ -> raise Exit end | _ -> raise Exit end | _ -> Printf.eprintf "xmp_date: Malformed date string (no year): %s\n%!" date; make_xmp_date_from_components d end | _ -> Printf.eprintf "xmp_date: Malformed date string (no prefix): %s\n%!" date; make_xmp_date_from_components d with Exit -> make_xmp_date_from_components d let set_pdf_info ?(xmp_also=false) ?(xmp_just_set=false) (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 if not xmp_just_set then begin pdf.Pdf.trailerdict <- Pdf.add_dict_entry pdf.Pdf.trailerdict "/Info" (Pdf.Indirect objnum); pdf.Pdf.minor <- max pdf.Pdf.minor version end; if xmp_also then begin match get_metadata pdf with None -> pdf | Some xmldata -> let xmp_date = function Pdf.String s -> Pdf.String (xmp_date s) | _ -> failwith "xmp_date not a string" in let changes, value = match key with | "/Producer" -> [(adobe, "Producer")], value | "/Creator" -> [(adobe, "Creator"); (xmp, "CreatorTool"); (dc, "creator")], value | "/Author" -> [(adobe, "Author")], value | "/Title" -> [(adobe, "Title"); (dc, "title")], value | "/Subject" -> [(adobe, "Subject"); (dc, "subject")], value | "/Keywords" -> [(adobe, "Keywords")], value | "/CreationDate" -> [(adobe, "CreationDate"); (xmp, "CreateDate")], xmp_date value | "/ModDate" -> [(adobe, "ModDate"); (xmp, "ModifyDate")], xmp_date value | "/Trapped" -> [(adobe, "Trapped")], value | _ -> failwith "Unknown call to set_pdf_info" in set_metadata_from_bytes true (set_pdf_info_xml_many changes value xmldata pdf) pdf end else pdf (* Set metadata date *) let set_metadata_date pdf date = match get_metadata pdf with None -> pdf | Some xmldata -> let changes= [(xmp, "MetadataDate")] in let value = match date with "now" -> xmp_date (expand_date "now") | x -> x in set_metadata_from_bytes true (set_pdf_info_xml_many changes (Pdf.String value) xmldata pdf) pdf let replacements pdf = let info = get_info_utf8 pdf in [("CREATEDATE", xmp_date (let i = info "/CreationDate" in if i = "" then expand_date "now" else i)); ("MODDATE", xmp_date (let i = info "/ModDate" in if i = "" then expand_date "now" else i)); ("PRODUCER", info "/Producer"); ("CREATOR", info "/Creator"); ("TITLE", info "/Title"); ("SUBJECT", info "/Subject"); ("AUTHOR", info "/Author"); ("KEYWORDS", info "/Keywords"); ("TRAPPED", info "/Trapped"); ("METADATADATE", xmp_date (expand_date "now"))] let create_metadata pdf = let xmp = ref xmp_template in iter (fun (s, r) -> xmp := string_replace_all s r !xmp) (replacements pdf); set_metadata_from_bytes false (bytes_of_string !xmp) pdf (* \section{Blacken text} *) (* \begin{verbatim} Algorithm: Change BT ET ...to... BT Op_g 0. ET \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 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 (ppstub 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 (ppstub 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 (ppstub 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 (ppstub 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 (ppstub 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 onlyremove boxes pdf resources prev = function | [] -> rev prev | (Pdfops.Op_Do name) as h::t -> if xobject_isimage pdf resources name && (match onlyremove with None -> true | Some x -> x = name) then remove_images_stream onlyremove boxes pdf resources (substitute boxes @ prev) t else remove_images_stream onlyremove boxes pdf resources (h::prev) t | Pdfops.InlineImage _ as h::t -> if onlyremove <> None then remove_images_stream onlyremove boxes pdf resources (h::prev) t else remove_images_stream onlyremove boxes pdf resources (substitute boxes @ prev) t | h::t -> remove_images_stream onlyremove boxes pdf resources (h::prev) t let rec process_form_xobject onlyremove 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 onlyremove 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 onlyremove boxes pdf page = let isform pdf xobj = match Pdf.lookup_direct pdf "/Subtype" xobj with Some (Pdf.Name "/Form") -> true | _ -> false in let isimage pdf xobj = match Pdf.lookup_direct pdf "/Subtype" xobj with Some (Pdf.Name "/Image") -> true | _ -> false in (* Remove image xobjects and look into form ones *) let form_xobjects, image_xobjects = match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with | Some (Pdf.Dictionary elts) -> keep (function (_, p) -> isform pdf p) elts, keep (function (_, p) -> isimage 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 onlyremove 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 image_xobjects' = match onlyremove with None -> [] | Some n -> option_map (function (n', _) as xobj -> if n = n' then None else Some xobj) image_xobjects in let newdict = Pdf.Dictionary (image_xobjects' @ 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 onlyremove 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 onlyremove 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 onlyremove 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 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 progress style prefix startval range = let ranges = map extremes (ranges_of_range [] [] range) and labels = Pdfpagelabels.read pdf in assert (length ranges > 0); let startval_additions = let r = ref [] in let sofar = ref 0 in iter (fun (s, e) -> r := !sofar :: !r; sofar := e - s + 1 + !sofar) ranges; rev !r 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 iter2 (fun (s, e) addition -> let label = {Pdfpagelabels.labelstyle = style; Pdfpagelabels.labelprefix = prefix; Pdfpagelabels.startpage = s; Pdfpagelabels.startvalue = startval + if progress then addition else 0} in labels := Pdfpagelabels.add_label (Pdfpage.endpage pdf) !labels label e) ranges startval_additions; Pdfpagelabels.write pdf !labels (* Parse the new content to make sure syntactically ok, append * as required. Rewrite the content *) let append_page_content_page fast s before pdf n page = let ops = Pdfops.parse_stream pdf page.Pdfpage.resources [bytes_of_string s] in (if before then Pdfpage.prepend_operators else Pdfpage.postpend_operators) pdf ops ~fast page let append_page_content s before fast range pdf = process_pages (ppstub (append_page_content_page fast s before pdf)) pdf range (* 1. Get list of indirects of all OCGs from the /OCProperties, and their textual names * 2. Calculate a change list to coalesce them * 3. Remove any changed ones from the /OCGs and /Order and /ON and /OFF in /OCProperties * 4. Do the changes to all indirect references in the whole pdf *) (*FIXME Pre-existing nulls - what to do? *) let ocg_coalesce pdf = match Pdf.lookup_direct pdf "/OCProperties" (Pdf.catalog_of_pdf pdf) with None -> () | Some ocpdict -> let number_name_pairs = match Pdf.lookup_direct pdf "/OCGs" ocpdict with Some (Pdf.Array ocgs) -> begin let numbers = map (function Pdf.Indirect i -> i | _ -> failwith "Malformed /OCG entry") ocgs in let names = map (fun i -> try begin match Pdf.lookup_obj pdf i with Pdf.Dictionary d -> begin match Pdf.lookup_direct pdf "/Name" (Pdf.Dictionary d) with Some (Pdf.String s) -> s | _ -> failwith "ocg: missing name" end | _ -> failwith "ocg: not a dictionary" end with _ -> failwith "OCG object missing") numbers in combine numbers names end | _ -> failwith "Malformed or missing /OCGs" in (*iter (fun (num, name) -> Printf.printf "%i = %s\n" num name) number_name_pairs;*) let changes = let cf (_, name) (_, name') = compare name name' in let sets = collate cf (List.stable_sort cf number_name_pairs) in flatten (option_map (function [] -> None | (hnum, _)::t -> Some (map (function (tnum, _) -> (tnum, hnum)) t)) sets) in (*Printf.printf "\nChanges are:\n"; List.iter (fun (f, t) -> Printf.printf "%i -> %i\n" f t) changes;*) let new_ocproperties = let remove_from_array key nums dict = match Pdf.lookup_direct pdf key dict with | Some (Pdf.Array elts) -> let elts' = option_map (function Pdf.Indirect i -> if mem i nums then None else Some (Pdf.Indirect i) | _ -> None) elts in Pdf.add_dict_entry dict key (Pdf.Array elts') | _ -> dict in let remove_from_array_inside_d key nums dict = match Pdf.lookup_direct pdf "/D" dict with | Some (Pdf.Dictionary ddict) -> begin match Pdf.lookup_direct pdf key (Pdf.Dictionary ddict) with | Some (Pdf.Array elts) -> let elts' = option_map (function Pdf.Indirect i -> if mem i nums then None else Some (Pdf.Indirect i) | _ -> None) elts in Pdf.add_dict_entry dict "/D" (Pdf.add_dict_entry (Pdf.Dictionary ddict) key (Pdf.Array elts')) | _ -> dict end | _ -> failwith "No /D dict in OCGProperties" in let nums = map fst changes in (*Printf.printf "\nto remove:\n"; List.iter (Printf.printf "%i ") nums;*) remove_from_array "/OCGs" nums (remove_from_array_inside_d "/ON" nums (remove_from_array_inside_d "/OFF" nums (remove_from_array_inside_d "/Order" nums ocpdict))) in (*flprint (Pdfwrite.string_of_pdf new_ocproperties);*) let ocp_objnum = Pdf.addobj pdf new_ocproperties in let new_catalog = Pdf.addobj pdf (Pdf.add_dict_entry (Pdf.catalog_of_pdf pdf) "/OCProperties" (Pdf.Indirect ocp_objnum)) in pdf.Pdf.trailerdict <- Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect new_catalog); pdf.Pdf.root <- new_catalog; Pdf.objselfmap (Pdf.renumber_object_parsed pdf (hashtable_of_dictionary changes)) pdf let ocg_get_list pdf = let l = ref [] in begin match Pdf.lookup_direct pdf "/OCProperties" (Pdf.catalog_of_pdf pdf) with None -> () | Some ocpdict -> match Pdf.lookup_direct pdf "/OCGs" ocpdict with Some (Pdf.Array elts) -> iter (function Pdf.Indirect i -> (match Pdf.lookup_direct pdf "/Name" (Pdf.lookup_obj pdf i) with Some (Pdf.String s) -> l := s::!l | _ -> ()) | _ -> ()) elts | _ -> () end; rev !l let ocg_list pdf = List.iter (Printf.printf "%s\n") (ocg_get_list pdf) let ocg_rename f t pdf = Pdf.objselfmap (function Pdf.Dictionary d -> begin match Pdf.lookup_direct pdf "/Type" (Pdf.Dictionary d) with Some (Pdf.Name "/OCG") -> begin match Pdf.lookup_direct pdf "/Name" (Pdf.Dictionary d) with Some (Pdf.String s) when s = f -> Pdf.add_dict_entry (Pdf.Dictionary d) "/Name" (Pdf.String t) | _ -> Pdf.Dictionary d end | _ -> Pdf.Dictionary d end | x -> x ) pdf let ocg_order_all pdf = match Pdf.lookup_direct pdf "/OCProperties" (Pdf.catalog_of_pdf pdf) with None -> () | Some ocpdict -> match Pdf.lookup_direct pdf "/OCGs" ocpdict with Some (Pdf.Array elts) -> begin match Pdf.lookup_direct pdf "/D" ocpdict with Some (Pdf.Dictionary d) -> let newd = Pdf.add_dict_entry (Pdf.Dictionary d) "/Order" (Pdf.Array elts) in let new_ocproperties = Pdf.add_dict_entry ocpdict "/D" newd in let ocp_objnum = Pdf.addobj pdf new_ocproperties in let new_catalog = Pdf.addobj pdf (Pdf.add_dict_entry (Pdf.catalog_of_pdf pdf) "/OCProperties" (Pdf.Indirect ocp_objnum)) in pdf.Pdf.trailerdict <- Pdf.add_dict_entry pdf.Pdf.trailerdict "/Root" (Pdf.Indirect new_catalog); pdf.Pdf.root <- new_catalog | _ -> () end | _ -> () (* Add rectangles on top of pages to show Media, Crop, Art, Trim, Bleed boxes. * * We use different dash lengths and colours to help distinguish coincident * boxes The sequence of operators is postpended to the page content, * appropriately protected to prevent pollution of matrices. * * /MediaBox: Solid red line * /CropBox: Dashed 7 on 7 off green line * /ArtBox: Dashed 5 on 5 off blue line * /TrimBox: Dashed 3 on 3 off orange line * /BleedBox: Dashed 2 on 2 off pink line *) let get_rectangle pdf page box = if box = "/MediaBox" then match page.Pdfpage.mediabox with Pdf.Array [a; b; c; d] as r -> Some (Pdf.parse_rectangle r) | _ -> None else match Pdf.lookup_direct pdf box page.Pdfpage.rest with Some (Pdf.Array [a; b; c; d] as r) -> Some (Pdf.parse_rectangle r) | _ -> None let show_boxes_page fast pdf _ page = let make_ops (r, g, b) on off boxname = match get_rectangle pdf page boxname with Some (r1, r2, r3, r4) -> [Pdfops.Op_q; Pdfops.Op_RG (r /. 255., g /. 255., b /. 255.); Pdfops.Op_w 1.; Pdfops.Op_d ((if on = 0. && off = 0. then [] else [on; off]), 0.); Pdfops.Op_re (r1, r2, r3 -. r1, r4 -. r2); Pdfops.Op_S; Pdfops.Op_Q] | None -> [] in let ops = make_ops (255., 0., 0.) 0. 0. "/MediaBox" @ make_ops (0., 255., 0.) 7. 7. "/CropBox" @ make_ops (0., 0., 255.) 5. 5. "/ArtBox" @ make_ops (255.,150.,0.) 3. 3. "/TrimBox" @ make_ops (255.,9.,147.) 2. 2. "/BleedBox" in Pdfpage.postpend_operators pdf ops ~fast page let show_boxes ?(fast=false) pdf range = process_pages (ppstub (show_boxes_page fast pdf)) pdf range let allowance = 9. let line (x0, y0, x1, y1) = [Pdfops.Op_m (x0, y0); Pdfops.Op_l (x1, y1); Pdfops.Op_s] let trim_marks_page fast pdf n page = match get_rectangle pdf page "/TrimBox", get_rectangle pdf page "/MediaBox" with | Some (tminx, tminy, tmaxx, tmaxy), Some (minx, miny, maxx, maxy) -> let ops = [Pdfops.Op_q; Pdfops.Op_K (1., 1., 1., 1.); Pdfops.Op_w 1.] @ line (minx, tmaxy, tminy -. allowance, tmaxy) (* top left *) @ line (tminx, tmaxy +. allowance, tminx, maxy) @ line (tmaxx +. allowance, tmaxy, maxx, tmaxy) (* top right *) @ line (tmaxx, tmaxy +. allowance, tmaxx, maxy) @ line (tmaxx +. allowance, tminy, maxx, tminy) (* bottom right *) @ line (tmaxx, tminy -. allowance, tmaxx, miny) @ line (tminx -. allowance, tminy, minx, tminy) (* bottom left *) @ line (tminx, tminy -. allowance, tminx, miny) @ [Pdfops.Op_Q] in Pdfpage.postpend_operators pdf ops ~fast page | _, _ -> (*Printf.eprintf "warning: no /TrimBox found on page %i\n%!" n;*) page let trim_marks ?(fast=false) pdf range = process_pages (ppstub (trim_marks_page fast pdf)) pdf range let rec remove_all_text_ops pdf resources content = let is_textop = function Pdfops.Op_Tj _ | Pdfops.Op_' _ | Pdfops.Op_'' _ | Pdfops.Op_TJ _ -> true | _ -> false in let content' = let ops = Pdfops.parse_operators pdf resources content in Pdfops.stream_of_ops (option_map (function x -> if is_textop x then None else Some x) ops) in [content'] let remove_all_text_page pdf p = let resources = p.Pdfpage.resources in let content = p.Pdfpage.content in process_xobjects pdf p remove_all_text_ops; {p with Pdfpage.content = remove_all_text_ops pdf resources content}, pdf let remove_all_text 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_all_text_page !pdf p else p, !pdf in pdf := pdf'; pages' =| p') pages pagenums; Pdfpage.change_pages true !pdf (rev !pages') let remove_dict_entry pdf key = Pdf.objselfmap (function (Pdf.Dictionary _ as d) | (Pdf.Stream _ as d) -> Pdf.remove_dict_entry d key | x -> x) pdf; pdf.Pdf.trailerdict <- Pdf.remove_dict_entry pdf.Pdf.trailerdict key let remove_clipping_ops pdf resources content = let ops = Pdfops.parse_operators pdf resources content in let rec process a = function Pdfops.Op_W::Pdfops.Op_n::t -> process (Pdfops.Op_n::a) t | h::t -> process (h::a) t | [] -> rev a in [Pdfops.stream_of_ops (process [] ops)] let remove_clipping pdf range = let remove_clipping_page _ page = let content' = remove_clipping_ops pdf page.Pdfpage.resources page.Pdfpage.content in process_xobjects pdf page remove_clipping_ops; {page with Pdfpage.content = content'} in process_pages (ppstub remove_clipping_page) pdf range (* Image resolution *) type xobj = | Image of int * int (* width, height *) | Form of Pdftransform.transform_matrix * Pdf.pdfobject * Pdf.pdfobject (* Will add actual data later. *) let image_results = ref [] let add_image_result i = image_results := i::!image_results (* Given a page and a list of (pagenum, name, thing) *) let rec image_resolution_page pdf page pagenum dpi (images : (int * string * xobj) list) = try let pageops = Pdfops.parse_operators pdf page.Pdfpage.resources page.Pdfpage.content and transform = ref [ref Pdftransform.i_matrix] in iter (function | Pdfops.Op_cm matrix -> begin match !transform with | [] -> raise (Failure "no transform") | _ -> (hd !transform) := Pdftransform.matrix_compose !(hd !transform) matrix end | Pdfops.Op_Do xobject -> let trans (x, y) = match !transform with | [] -> raise (Failure "no transform") | _ -> Pdftransform.transform_matrix !(hd !transform) (x, y) in let o = trans (0., 0.) and x = trans (1., 0.) and y = trans (0., 1.) in (*i Printf.printf "o = %f, %f, x = %f, %f, y = %f, %f\n" (fst o) (snd o) (fst x) (snd x) (fst y) (snd y); i*) let rec lookup_image k = function | [] -> assert false | (_, a, _) as h::_ when a = k -> h | _::t -> lookup_image k t in begin match lookup_image xobject images with | (pagenum, name, Form (xobj_matrix, content, resources)) -> let content = (* Add in matrix etc. *) let total_matrix = Pdftransform.matrix_compose xobj_matrix !(hd !transform) in let ops = Pdfops.Op_cm total_matrix:: Pdfops.parse_operators pdf resources [content] in Pdfops.stream_of_ops ops in let page = {Pdfpage.content = [content]; Pdfpage.mediabox = Pdfpage.rectangle_of_paper Pdfpaper.a4; Pdfpage.resources = resources; Pdfpage.rotate = Pdfpage.Rotate0; Pdfpage.rest = Pdf.Dictionary []} in let newpdf = Pdfpage.change_pages false pdf [page] in image_resolution newpdf [pagenum] dpi | (pagenum, name, Image (w, h)) -> let lx = Pdfunits.convert 0. Pdfunits.PdfPoint Pdfunits.Inch (distance_between o x) and ly = Pdfunits.convert 0. Pdfunits.PdfPoint Pdfunits.Inch (distance_between o y) in let wdpi = float w /. lx and hdpi = float h /. ly in add_image_result (pagenum, xobject, w, h, wdpi, hdpi) (*Printf.printf "%i, %s, %i, %i, %f, %f\n" pagenum xobject w h wdpi hdpi*) (*i else Printf.printf "S %i, %s, %i, %i, %f, %f\n" pagenum xobject (int_of_float w) (int_of_float h) wdpi hdpi i*) end | Pdfops.Op_q -> begin match !transform with | [] -> raise (Failure "Unbalanced q/Q ops") | h::t -> let h' = ref Pdftransform.i_matrix in h' := !h; transform := h'::h::t end | Pdfops.Op_Q -> begin match !transform with | [] -> raise (Failure "Unbalanced q/Q ops") | _ -> transform := tl !transform end | _ -> ()) pageops with e -> Printf.printf "Error %s\n" (Printexc.to_string e); flprint "\n" and image_resolution pdf range dpi = let images = ref [] in iter_pages (fun pagenum page -> (* 1. Get all image names and their native resolutions from resources as string * int * int *) match Pdf.lookup_direct pdf "/XObject" page.Pdfpage.resources with | Some (Pdf.Dictionary xobjects) -> iter (function (name, xobject) -> match Pdf.lookup_direct pdf "/Subtype" xobject with | Some (Pdf.Name "/Image") -> let width = match Pdf.lookup_direct pdf "/Width" xobject with | Some x -> Pdf.getnum x | None -> 1. and height = match Pdf.lookup_direct pdf "/Height" xobject with | Some x -> Pdf.getnum x | None -> 1. in images := (pagenum, name, Image (int_of_float width, int_of_float height))::!images | Some (Pdf.Name "/Form") -> let resources = match Pdf.lookup_direct pdf "/Resources" xobject with | None -> page.Pdfpage.resources (* Inherit from page or form above. *) | Some r -> r and contents = xobject and matrix = match Pdf.lookup_direct pdf "/Matrix" xobject with | Some (Pdf.Array [a; b; c; d; e; f]) -> {Pdftransform.a = Pdf.getnum a; Pdftransform.b = Pdf.getnum b; Pdftransform.c = Pdf.getnum c; Pdftransform.d = Pdf.getnum d; Pdftransform.e = Pdf.getnum e; Pdftransform.f = Pdf.getnum f} | _ -> Pdftransform.i_matrix in images := (pagenum, name, Form (matrix, contents, resources))::!images | _ -> () ) xobjects | _ -> ()) pdf range; (* Now, split into differing pages, and call [image_resolution_page] on each one *) let pagesplits = map (function (a, _, _)::_ as ls -> (a, ls) | _ -> assert false) (collate (fun (a, _, _) (b, _, _) -> compare a b) (rev !images)) and pages = Pdfpage.pages_of_pagetree pdf in iter (function (pagenum, images) -> let page = select pagenum pages in image_resolution_page pdf page pagenum dpi images) pagesplits let image_resolution pdf range dpi = image_results := []; image_resolution pdf range dpi; rev !image_results