Module `Cpdf`

Types and Exceptions

Coherent PDF Tools Core Routines

type encoding =

| Raw
| UTF8
| Stripped

Possible output encodings for some function. Raw does no processing at all - the PDF string is output as-is. UTF8 converts loslessly to UTF8. Stripped extracts the unicode codepoints and returns only those which correspond to 7 bit ASCII.

exception SoftError of string

exception HardError of string

Two exceptions recommended for use with the library, though currently not raised by any function in this module. Cpdfcommand uses them extensively.

type position =

| PosCentre of float * float
| PosLeft of float * float
| PosRight of float * float
| Top of float
| TopLeft of float
| TopRight of float
| Left of float
| BottomLeft of float
| Bottom of float
| BottomRight of float
| Right of float
| Diagonal
| ReverseDiagonal
| Centre

Possible positions for adding text and other uses. See cpdfmanual.pdf

Debug

val print_pdf_objs : Pdf.t -> unit

Debug: Print out a PDF in readable form to the terminal

Working with pages

val endpage_io : 
  ?revision:int ->
  Pdfio.input ->
  string option ->
  string option ->
  int

Like Pdfpage.endpage, but from an input and possible password - does the minimal work to find the number of pages.

val process_pages : 
  (int -> Pdfpage.t -> Pdfpage.t * int * Pdftransform.transform_matrix) ->
  Pdf.t ->
  int list ->
  Pdf.t

Given a function from page number and page to page, a document, and a list of page numbers to apply it to, apply the function to all those pages.

val iter_pages : (int -> Pdfpage.t -> unit) -> Pdf.t -> int list -> unit

Same as process_pages, but iterate rather than map.

val map_pages : (int -> Pdfpage.t -> 'a) -> Pdf.t -> int list -> 'a list

Same as process_pages but return the list of outputs of the map function.

Page specifications and ranges

Here are the rules for building input ranges:

A comma (,) allows one to specify several ranges, e.g. 1-2,4-5.
The word end represents the last page number.
The words odd and even can be used in place of or at the end of a page range to restrict to just the odd or even pages.
The word reverse is the same as end-1.
The word all is the same as 1-end.
A range must contain no spaces.
A tilde (~) defines a page number counting from the end of the document rather than the beginning. Page ~1 is the last page, ~2 the penultimate page etc.

val parse_pagespec : Pdf.t -> string -> int list

Parse a (valid) page specification to a page range

val string_of_pagespec : Pdf.t -> int list -> string

Return a string for the given range. Knows how to identify all, odd, even, x-y ranges etc.

val validate_pagespec : string -> bool

Is a page specification, in theory, valid? This is the most we can find out without supplying a PDF, and thus knowing how many pages there are in it.

val parse_pagespec_without_pdf : string -> int list

val recompress_pdf : Pdf.t -> Pdf.t

Compresses all streams in the PDF document which are uncompressed, using /FlateDecode, leaving out metadata. If the PDF is encrypted, does nothing.

val decompress_pdf : Pdf.t -> Pdf.t

Decompresses all streams in a PDF document, assuming it isn't encrypted.

Metadata and settings

val copy_id : bool -> Pdf.t -> Pdf.t -> Pdf.t

copy_id keepversion copyfrom copyto copies the ID, if any, from copyfrom to copyto. If keepversion is true, the PDF version of copyto won't be affected.

val set_pdf_info : 
  ?xmp_also:bool ->
  ?xmp_just_set:bool ->
  (string * Pdf.pdfobject * int) ->
  Pdf.t ->
  Pdf.t

set_pdf_info (key, value, version) sets the entry key in the /Info directory, updating the PDF minor version to version.

val get_xmp_info : Pdf.t -> string -> string

val set_viewer_preference : (string * Pdf.pdfobject * int) -> Pdf.t -> Pdf.t

set_pdf_info (key, value, version) sets the entry key in the /ViewerPreferences directory, updating the PDF minor version to version.

val set_page_layout : Pdf.t -> string -> Pdf.t

Set the page layout to the given name (sans slash) e.g SinglePage

val set_page_mode : Pdf.t -> string -> Pdf.t

Set the page layout to the given name (sans slash) e.g SinglePage

val set_open_action : Pdf.t -> bool -> int -> Pdf.t

Set the open action. If the boolean is true, /Fit will be used, otherwise /XYZ

val set_version : int -> Pdf.t -> unit

Set the PDF version number

val get_info_utf8 : Pdf.t -> string -> string

Given a PDF, returns a function which can lookup a given dictionary entry from the /Info dictionary, returning it as a UTF8 string

val output_info : encoding -> Pdf.t -> unit

Output to standard output general information about a PDF.

val output_xmp_info : encoding -> Pdf.t -> unit

Output to standard output information from any XMP metadata stream in a PDF.

Presentations

val presentation : 
  int list ->
  string option ->
  float option ->
  bool ->
  bool ->
  int ->
  float ->
  Pdf.t ->
  Pdf.t

presentation range t d horizontal inward direction effect_duration pdf adds a presentation on the pages in range. See cpdfmanual.pdf for details.

val attach_file : 
  ?memory:Pdfio.bytes ->
  bool ->
  int option ->
  Pdf.t ->
  string ->
  Pdf.t

attach_file keepversion topage pdf filename attaches the file in filename to the pdf, optionally to a page (rather than document-level). If keepversion is true, the PDF version number won't be altered.

val remove_attached_files : Pdf.t -> Pdf.t

Remove attached files.

type attachment = {

name : string;
pagenumber : int;
data : unit -> Pdfio.bytes;

}

val list_attached_files : Pdf.t -> attachment list

List attached files. Attachment name and page number. Page 0 is document level.

Bookmarks

val parse_bookmark_file : bool -> Pdf.t -> Pdfio.input -> Pdfmarks.t list

parse_bookmark_file verify pdf input parses the bookmark file in input. Details of the bookmark file format can be found in cpdfmanual.pdf

val add_bookmarks : bool -> Pdfio.input -> Pdf.t -> Pdf.t

add_bookmarks verify input pdf adds bookmarks from the bookmark file give. If verify is given, bookmarks will be verified to ensure, for example, that they are not out of the page range.

val list_bookmarks : encoding -> int list -> Pdf.t -> Pdfio.output -> unit

list_bookmarks encoding range pdf output lists the bookmarks to the given output in the format specified in cpdfmanual.pdf

XML Metadata

val set_metadata : bool -> string -> Pdf.t -> Pdf.t

set_metadata keepversion filename pdf sets the XML metadata of a PDF to the contents of filename. If keepversion is true, the PDF version will not be altered.

val set_metadata_from_bytes : bool -> Pdfio.bytes -> Pdf.t -> Pdf.t

The same, but the content comes from bytes.

val remove_metadata : Pdf.t -> Pdf.t

Remove the metadata from a file

val get_metadata : Pdf.t -> Pdfio.bytes option

Extract metadata to a Pdfio.bytes

val print_metadata : Pdf.t -> unit

Print metadate to stdout

val set_metadata_date : Pdf.t -> string -> Pdf.t

Set the metadata date

val create_metadata : Pdf.t -> Pdf.t

Create XMP metadata from scratch

Stamping

val combine_pages : bool -> Pdf.t -> Pdf.t -> bool -> bool -> bool -> Pdf.t

combine_pages fast under over scaletofit swap equalize combines the page content of two PDFs, page-by-page. If equalize is true the output will have the same number of pages as the shorter file. If scaletofit is true, the over file will be scaled to fit. If swap is true, over and under are swapped. If fast is true, the PDFs are assumed to be well-formed and no fixes are done.

val stamp : 
  bool ->
  position ->
  bool ->
  bool ->
  bool ->
  bool ->
  bool ->
  int list ->
  Pdf.t ->
  Pdf.t ->
  Pdf.t

stamp relative_to_cropbox position topline midline fast scale_to_fit isover range over pdf stamps the first page of over over each page of the PDF. The arguments have the same meaning as in combine_pages.

Splitting PDFs

val split_on_bookmarks : Pdf.t -> int -> Pdf.t list

Split a PDF on bookmarks of a given level or below. Level 0 is top level.

Listing fonts

val print_fonts : Pdf.t -> unit

Print font list to stdout

val list_fonts : Pdf.t -> (int * string * string * string * string) list

Return font list. Page number, name, subtype, basefont, encoding.

Adding text

val expand_date : string -> string

Expand the string "now" to a PDF date string, ignoring any other string

val string_of_position : position -> string

Produce a debug string of a position

type orientation =

| Horizontal
| Vertical
| VerticalDown

Orientation of the string on the page

type justification =

| LeftJustify
| CentreJustify
| RightJustify

Justification of multiline text

val calculate_position : 
  bool ->
  float ->
  (float * float * float * float) ->
  orientation ->
  position ->
  float * float * float

calculate_position ignore_d w (xmin, ymin, xmax, ymax) orientation pos calculates the absolute position of text given its width, bounding box, orientation and position. If ignore_d is true, the distance from the position (e.g 10 in TopLeft 10) is ignored (considered zero).

val addtexts : 
  bool ->
  float ->
  bool ->
  bool ->
  string ->
  Pdftext.standard_font option ->
  bool ->
  int ->
  int option ->
  (float * float * float) ->
  position ->
  float ->
  float ->
  bool ->
  string ->
  int list ->
  orientation ->
  bool ->
  float ->
  justification ->
  bool ->
  bool ->
  string ->
  float option ->
  string ->
  Pdf.t ->
  Pdf.t

Call add_texts metrics linewidth outline fast fontname font bates batespad colour position linespacing fontsize underneath text pages orientation relative_to_cropbox midline_adjust topline filename pdf. For details see cpdfmanual.pdf

val metrics_howmany : unit -> int

val metrics_text : int -> string

val metrics_x : int -> float

val metrics_y : int -> float

val metrics_rot : int -> float

val metrics_baseline_adjustment : unit -> float

These functions returns some details about the text if addtexts is called with metrics true. The integer arguments are 1 for the first one, 2 for the second etc. Call metrics_howmany first to find out how many.

val removetext : int list -> Pdf.t -> Pdf.t

Remove text from the given pages.

Page geometry

val output_page_info : Pdf.t -> int list -> unit

Print page info (Mediabox etc) to standard output.

val hasbox : Pdf.t -> int -> string -> bool

True if a given page in a PDF has a given box

val crop_pdf : 
  ?box:string ->
  (float * float * float * float) list ->
  Pdf.t ->
  int list ->
  Pdf.t

crop_pdf xywhlist pdf range sets the cropbox on the given pages.

val hard_box : Pdf.t -> int list -> string -> bool -> bool -> Pdf.t

val set_mediabox : 
  (float * float * float * float) list ->
  Pdf.t ->
  int list ->
  Pdf.t

set_mediabox xywhlist pdf range sets the media box on the given pages.

val setBox : 
  string ->
  float ->
  float ->
  float ->
  float ->
  Pdf.t ->
  int list ->
  Pdf.t

setBox boxname x y w h pdf range sets the given box on the given pages.

val remove_cropping_pdf : Pdf.t -> int list -> Pdf.t

Remove any cropping from the given pages.

val remove_trim_pdf : Pdf.t -> int list -> Pdf.t

Remove any trim box from the given pages.

val remove_bleed_pdf : Pdf.t -> int list -> Pdf.t

Remove any bleed box from the given pages.

val remove_art_pdf : Pdf.t -> int list -> Pdf.t

Remove any art box from the given pages.

val rotate_pdf : int -> Pdf.t -> int list -> Pdf.t

Change rotation to a given value 0, 90, 180, 270 on given pages.

val rotate_pdf_by : int -> Pdf.t -> int list -> Pdf.t

Rotate clockwise by 0, 90, 180, 270 on given pages.

val rotate_contents : ?fast:bool -> float -> Pdf.t -> int list -> Pdf.t

Rotate the contents by the given angle on the given pages. If fast is true, assume PDF is well-formed.

val upright : ?fast:bool -> int list -> Pdf.t -> Pdf.t

Modify the rotation of the page and its contents to leave the rotation at 0 with the page effectively unaltered.

val vflip_pdf : ?fast:bool -> Pdf.t -> int list -> Pdf.t

Flip the given pages vertically

val hflip_pdf : ?fast:bool -> Pdf.t -> int list -> Pdf.t

Flip the given pages horizontally

val shift_pdf : 
  ?fast:bool ->
  (float * float) list ->
  Pdf.t ->
  int list ->
  Pdf.t

Shift a PDF in x and y (in pts) in the given pages. List of (x, y) pairs is for all pages in pdf.

val scale_pdf : 
  ?fast:bool ->
  (float * float) list ->
  Pdf.t ->
  int list ->
  Pdf.t

Scale a PDF in sx, sy in the given pages. List of (sx, sy) pairs is for all pages in pdf.

val scale_to_fit_pdf : 
  ?fast:bool ->
  position ->
  float ->
  (float * float) list ->
  'a ->
  Pdf.t ->
  int list ->
  Pdf.t

scale_to_fit_pdf fast position input_scale x y op pdf range scales a page to fit the page size given by (x, y) and by the input_scale (e.g 1.0 = scale to fit, 0.9 = scale to fit leaving a border etc.). op is unused.

val scale_contents : 
  ?fast:bool ->
  position ->
  float ->
  Pdf.t ->
  int list ->
  Pdf.t

Scale the contents of a page by a given factor centred around a given point in a given range.

val trim_marks : ?fast:bool -> Pdf.t -> int list -> Pdf.t

val show_boxes : ?fast:bool -> Pdf.t -> int list -> Pdf.t

Padding

val padbefore : ?padwith:Pdf.t -> int list -> Pdf.t -> Pdf.t

Put blank pages before the given page numbers

val padafter : ?padwith:Pdf.t -> int list -> Pdf.t -> Pdf.t

Put blank pages after the given page numbers

val padmultiple : int -> Pdf.t -> Pdf.t

Pad to a multiple of n pages

Annotations

val list_annotations : encoding -> Pdf.t -> unit

List the annotations to standard output in a given encoding. See cpdfmanual.pdf for the format details.

val list_annotations_more : Pdf.t -> unit

The same, but giving more information. Deprecated

val get_annotations : encoding -> Pdf.t -> (int * string) list

Return the annotations as a (pagenumber, content) list

val copy_annotations : int list -> Pdf.t -> Pdf.t -> Pdf.t

Copy the annotations on a given set of pages from a to b. b is returned.

val remove_annotations : int list -> Pdf.t -> Pdf.t

Remove the annotations on given pages.

Imposition

val twoup_stack : bool -> Pdf.t -> Pdf.t

The twoup_stack operation puts two logical pages on each physical page, rotating them 90 degrees to do so. The new mediabox is thus larger. Bool true (fast) if assume well-formed ISO content streams.

val twoup : bool -> Pdf.t -> Pdf.t

The twoup operation does the same, but scales the new sides down so that the media box is unchanged. Bool true (fast) if assume well-formed ISO content streams.

Making new documents

val blank_document : float -> float -> int -> Pdf.t

Make a blank document given x and y page dimensions in points and a number of pages

val blank_document_paper : Pdfpaper.t -> int -> Pdf.t

The same, but give a Pdfpaper.t paper size.

Page labels

val add_page_labels : 
  Pdf.t ->
  bool ->
  Pdfpagelabels.labelstyle ->
  string option ->
  int ->
  int list ->
  unit

Add page labels.

Miscellany

val thinlines : int list -> float -> Pdf.t -> Pdf.t

Make all lines in the PDF at least a certain thickness.

val blacktext : (float * float * float) -> int list -> Pdf.t -> Pdf.t

Make all text on certain pages black.

val blacklines : (float * float * float) -> int list -> Pdf.t -> Pdf.t

Make all lines on certain pages black.

val blackfills : (float * float * float) -> int list -> Pdf.t -> Pdf.t

Make all fills on certain pages black.

val draft : string option -> bool -> int list -> Pdf.t -> Pdf.t

Remove images from a PDF, optionally adding crossed boxes.

val squeeze : 
  ?logto:string ->
  ?pagedata:bool ->
  ?recompress:bool ->
  Pdf.t ->
  unit

Squeeze a PDF

val remove_all_text : int list -> Pdf.t -> Pdf.t

package cpdf

Module Cpdf