cpdf-source/docsplits/javascriptsplits/c02.tex

// CHAPTER 1. Basics

/** Loads a PDF file from a given file. Supply a user password (possibly blank)
in case the file is encrypted. It won't be decrypted, but sometimes the
password is needed just to load the file.
@arg {string} filename File name
@arg {string} userpw User password, or blank if none */
function fromFile(filename, userpw) {}

/** Loads a PDF from a file, doing only minimal parsing. The objects will be
read and parsed when they are actually needed. Use this when the whole file
won't be required. Also supply a user password (possibly blank) in case the
file is encrypted. It won't be decrypted, but sometimes the password is needed
just to load the file.
@arg {string} filename File name
@arg {string} userpw User password, or blank if none */
function fromFileLazy(filename, userpw) {}

/** Loads a file from memory given any user password.
@arg {Uint8Array} data PDF document as an array of bytes
@arg {string} userpw User password, or blank if none */
function fromMemory(data, userpw) {}

/** Loads a file from memory, given a pointer and a length, and the user
password, but lazily like fromFileLazy.
@arg {Uint8Array} data PDF document as an array of bytes
@arg {string} userpw User password, or blank if none */
function fromMemoryLazy(data, userpw) {}

/** To enumerate the list of currently allocated PDFs, call startEnumeratePDFs
which gives the number, n, of PDFs allocated, then enumeratePDFsInfo and
enumeratePDFsKey with index numbers from 0...(n - 1). Call endEnumeratePDFs to
clean up.
@return {number} number of PDFs */
function startEnumeratePDFs() {}

/** To enumerate the list of currently allocated PDFs, call startEnumeratePDFs
which gives the number, n, of PDFs allocated, then enumeratePDFsInfo and
enumeratePDFsKey with index numbers from 0...(n - 1). Call endEnumeratePDFs to
clean up.
@arg {n} index number
@return {number} PDF key */
function enumeratePDFsKey(n) {}

/** To enumerate the list of currently allocated PDFs, call startEnumeratePDFs
which gives the number, n, of PDFs allocated, then enumeratePDFsInfo and
enumeratePDFsKey with index numbers from 0...(n - 1). Call endEnumeratePDFs to
clean up.
@arg {n} index number
@return {number} PDF information */
function enumeratePDFsInfo(n) {}

/** To enumerate the list of currently allocated PDFs, call startEnumeratePDFs
which gives the number, n, of PDFs allocated, then enumeratePDFsInfo and
enumeratePDFsKey with index numbers from 0...(n - 1). Call endEnumeratePDFs to
clean up. */
function endEnumeratePDFs() {}

/** Converts a figure in centimetres to points (72 points to 1 inch)
@arg {number} i figure in centimetres
@return {number} figure in points */
function ptOfCm(i) {}

/** Converts a figure in millimetres to points (72 points to 1 inch)
@arg {number} i figure in millimetres
@return {number} figure in points */
function ptOfMm(i) {}

/** Converts a figure in inches to points (72 points to 1 inch)
@arg {number} i figure in inches
@return {number} figure in points */
function ptOfIn(i) {}

/** Converts a figure in points to centimetres (72 points to 1 inch)
@arg {number} i figure in points
@return {number} figure in centimetres */
function cmOfPt(i) {}

/** Converts a figure in points to millimetres (72 points to 1 inch)
@arg {number} i figure in points
@return {number} figure in millimetres */
function mmOfPt(i) {}

/** Converts a figure in points to inches (72 points to 1 inch)
@arg {number} i figure in points 
@return {number} figure in inches */
function inOfPt(i) {}

/** Parses a page specification with reference to a given PDF (the PDF is
supplied so that page ranges which reference pages which do not exist are
rejected).
@arg {pdf} pdf PDF document
@arg {string} pagespec Page specification
@return {array} page range */
function parsePagespec(pdf, pagespec) {}

/** Validates a page specification so far as is possible in the absence of
the actual document. Result is true if valid.
@arg {string} pagespec Page specification
@return {boolean} validity or otherwise of page specification */
function validatePagespec(pagespec) {}

/** Builds a page specification from a page range. For example, the range
containing 1,2,3,6,7,8 in a document of 8 pages might yield "1-3,6-end"
@arg {pdf} pdf PDF document
@arg {array} r Page range
@return {string} Page specifcation */
function stringOfPagespec(pdf, r) {}

/** Creates a range with no pages in.
@return {array} Page range */
function blankRange() {}

/** Builds a range from one page to another inclusive. For example, range(3,7)
gives the range 3,4,5,6,7
@arg {number} f begining of page range
@arg {number} t end of page range
@return {array} page range */
function range(f, t) {}

/** The range containing all the pages in a given document.
@arg {pdf} pdf PDF document
@return {array} page range */
function all(pdf) {}

/** Makes a range which contains just the even pages of another range.
@arg {array} r_in page range
@return {array} page range */
function even(r_in) {}

/** Makes a range which contains just the odd pages of another range.
@arg {array} r_in page range
@return {array} page range */
function odd(r_in) {}

/** Makes the union of two ranges giving a range containing the pages in range
a and range b.
@arg {array} a page range
@arg {array} b page range
@return {array} page range */
function rangeUnion(a, b) {}

/** Makes the difference of two ranges, giving a range containing all the
pages in a except for those which are also in b.
@arg {array} a page range
@arg {array} b page range
@return {array} page range */
function difference(a, b) {}

/** Deduplicates a range, making a new one.
@arg {array} a page range
@return {array} page range */
function removeDuplicates(a) {}

/** Gives the number of pages in a range.
@arg {array} r page range
@return {number} length */
function rangeLength(r) {}

/** Gets the page number at position n in a range, where n runs from 0 to
rangeLength - 1.
@arg {array} r page range
@arg {number} n position
@return {number} page at given position */
function rangeGet(r, n) {}

/** Adds the page to a range, if it is not already there.
@arg {array} r page range
@arg {number} page page number */
function rangeAdd(r, page) {}

/** Returns true if the page is in the range, false otherwise.
@arg {array} r page range
@arg {number} page page number
@return {boolean} true if page in range, false otherwise */
function isInRange(r, page) {}

/** Returns the number of pages in a PDF.
@arg {pdf} pdf PDF document
@return {number} number of pages */
function pages(pdf) {}

/** Returns the number of pages in a given PDF, with given user password. It
tries to do this as fast as possible, without loading the whole file.
@arg {string} password user password
@arg {string} filename file name
@return {number} number of pages */
function pagesFast(password, filename) {}

/** Returns the number of pages in a given PDF, with given user password. It
tries to do this as fast as possible, without loading the whole file.
@arg {string} password user password
@arg {Uint8Array} data PDF file as a byte array
@return {number} number of pages */
function pagesFastMemory(password, data) {}

/** Writes the file to a given filename. If linearize is true, it will be
linearized if a linearizer is available. If make_id is true, it will be
given a new ID.
@arg {pdf} pdf PDF document
@arg {string} filename file name
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} make_id make a new /ID */
function toFile(pdf, filename, linearize, make_id) {}

/** Writes the file to a given filename. If make_id is true, it will be given
a new ID.  If preserve_objstm is true, existing object streams will be
preserved. If generate_objstm is true, object streams will be generated even if
not originally present. If compress_objstm is true, object streams will be
compressed (what we usually want). WARNING: the pdf argument will be invalid
after this call, and should be not be used again.
@arg {pdf} pdf PDF document
@arg {string} filename file name
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} preserve_objstm preserve existing object streams
@arg {boolean} generate_objstm create new object streams
@arg {boolean} compress_objstm compress new object streams */
function toFileExt(pdf, filename, linearize, make_id, preserve_objstm, generate_objstm, compress_objstm) {}

/** Writes a PDF file and returns as an array of bytes.
@arg {pdf} pdf PDF document
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} make_id make a new /ID
@result {Uint8Array} PDF document as an array of bytes */
function toMemory(pdf, linearize, make_id) {}

/** Writes the file to memory. If make_id is true, it will be given
a new ID.  If preserve_objstm is true, existing object streams will be
preserved. If generate_objstm is true, object streams will be generated even if
not originally present. If compress_objstm is true, object streams will be
compressed (what we usually want). WARNING: the pdf argument will be invalid
after this call, and should be not be used again.
@arg {pdf} pdf PDF document
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} preserve_objstm preserve existing object streams
@arg {boolean} generate_objstm create new object streams
@arg {boolean} compress_objstm compress new object streams
@result {Uint8Array} PDF file as a byte array */
function toMemoryExt(pdf, linearize, make_id, preserve_objstm, generate_objstm, compress_objstm) {}

/** Returns true if a document is encrypted, false otherwise.
@arg {pdf} pdf PDF document
@return {boolean} true if document encrypted, false otherwise */
function isEncrypted(pdf) {}

/** Attempts to decrypt a PDF using the given user password. An exception is
raised if the decryption fails.
@arg {pdf} pdf PDF document
@arg {string} userpw user password, or empty if none */
function decryptPdf(pdf, userpw) {}

/** Attempts to decrypt a PDF using the given owner password. Raises an
exception if the decryption fails.
@arg {pdf} pdf PDF document
@arg {string} ownerpw owner password, or empty if none */
function decryptPdfOwner(pdf, ownerpw) {}

/** Cannot edit the document */
var noEdit = 0;

/** Cannot print the document */
var noPrint = 1;

/** Cannot copy the document */
var noCopy = 2;

/** Cannot annotate the document */
var noAnnot = 3;

/** Cannot edit forms in the document */
var noForms = 4;

/** Cannot extract information */
var noExtract = 5;

/** Cannot assemble into a bigger document */
var noAssemble = 6;

/** Cannot print high quality */
var noHqPrint = 7;

/** 40 bit RC4 encryption */
var pdf40bit = 0;

/** 128 bit RC4 encryption */
var pdf128bit = 1;

/** 128 bit AES encryption, do not encrypt metadata */
var aes128bitfalse = 2;

/** 128 bit AES encryption, encrypt metadata */
var aes128bittrue = 3;

/** Deprecated. Do not use for new files */
var aes256bitfalse = 4;

/** Deprecated. Do not use for new files */
var aes256bittrue = 5;

/** 256 bit AES encryption, do not encrypt metadata */
var aes256bitisofalse = 6;

/** 256 bit AES encryption, encrypt metadata */
var aes256bitisotrue = 7;

/** Writes a file as encrypted.
@arg {pdf} pdf PDF document
@arg {"encryption method"} encryption_method encryption method
@arg {"permission array"} array of permissions
@arg {string} ownerpw owner password
@arg {string} userpw user password
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} makeid make a new /ID
@arg {string} filename file name */
function toFileEncrypted(pdf, encryption_method, permissions, ownerpw, userpw, linearize, makeid, filename) {}

/** Writes to memory as encrypted.
@arg {pdf} pdf PDF document
@arg {"encryption method"} encryption_method encryption method
@arg {"permission array"} array of permissions
@arg {string} ownerpw owner password
@arg {string} userpw user password
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} makeid make a new /ID
@return {Uint8Array} PDF file as a byte array */
function toMemoryEncrypted(pdf, encryption_method, permissions, ownerpw, userpw, linearize, makeid) {}

/** Writes a file as encrypted with extra parameters. WARNING: the pdf argument
will be invalid after this call, and should not be used again.
@arg {pdf} pdf PDF document
@arg {"encryption method"} encryption_method encryption method
@arg {"permission array"} array of permissions
@arg {string} ownerpw owner password
@arg {string} userpw user password
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} makeid make a new /ID
@arg {boolean} preserve_objstm preserve existing object streams
@arg {boolean} generate_objstm generate new object streams
@arg {boolean} compress_objstm compress object streams
@arg {string} filename file name */
function toFileEncryptedExt(pdf, encryption_method, permissions, ownerpw, userpw, linearize, makeid, preserve_objstm, generate_objstm, compress_objstm, filename) {}

/** Writes a file as encrypted with extra parameters. WARNING: the pdf argument
will be invalid after this call, and should not be used again.
@arg {pdf} pdf PDF document
@arg {"encryption method"} encryption_method encryption method
@arg {"permission array"} array of permissions
@arg {string} ownerpw owner password
@arg {string} userpw user password
@arg {boolean} linearize linearize if a linearizer is available
@arg {boolean} makeid make a new /ID
@arg {boolean} preserve_objstm preserve existing object streams
@arg {boolean} generate_objstm generate new object streams
@arg {boolean} compress_objstm compress object streams
@return {Uint8Array} PDF file as a byte array */
function toMemoryEncryptedExt(pdf, encryption_method, permissions, ownerpw, userpw, linearize, makeid, preserve_objstm, generate_objstm, compress_objstm) {}

/** Returns true if the given permission (restriction) is present.
@arg {pdf} pdf PDF document
@arg {permission} permission permission
@return {boolean} true if permission present */
function hasPermission(pdf, permission) {}

/** Returns the encryption method currently in use on a document.
@arg {pdf} pdf PDF document
@return {"encryption method"} encryption method */
function encryptionKind(pdf) {}