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// Copyright (c) 2005-2024 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License
// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
// or implied. See the License for the specific language governing permissions and limitations under
// the License.
//
// Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
// License. At your option, you may continue to consider qpdf to be licensed under those terms.
// Please see the manual for additional information.
#ifndef QPDF_HH
#define QPDF_HH
#include <qpdf/DLL.h>
#include <qpdf/Types.h>
#include <cstdio>
#include <functional>
#include <iostream>
#include <list>
#include <map>
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include <qpdf/Buffer.hh>
#include <qpdf/InputSource.hh>
#include <qpdf/PDFVersion.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QPDFObjGen.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QPDFStreamFilter.hh>
#include <qpdf/QPDFTokenizer.hh>
#include <qpdf/QPDFXRefEntry.hh>
class QPDF_Stream;
class BitStream;
class BitWriter;
class QPDFLogger;
class QPDFParser;
class QPDF
{
public:
// Get the current version of the QPDF software. See also qpdf/DLL.h
QPDF_DLL
static std::string const& QPDFVersion();
QPDF_DLL
QPDF();
QPDF_DLL
~QPDF();
QPDF_DLL
static std::shared_ptr<QPDF> create();
// Associate a file with a QPDF object and do initial parsing of the file. PDF objects are not
// read until they are needed. A QPDF object may be associated with only one file in its
// lifetime. This method must be called before any methods that potentially ask for information
// about the PDF file are called. Prior to calling this, the only methods that are allowed are
// those that set parameters. If the input file is not encrypted, either a null password or an
// empty password can be used. If the file is encrypted, either the user password or the owner
// password may be supplied. The method setPasswordIsHexKey may be called prior to calling this
// method or any of the other process methods to force the password to be interpreted as a raw
// encryption key. See comments on setPasswordIsHexKey for more information.
QPDF_DLL
void processFile(char const* filename, char const* password = nullptr);
// Parse a PDF from a stdio FILE*. The FILE must be open in binary mode and must be seekable.
// It may be open read only. This works exactly like processFile except that the PDF file is
// read from an already opened FILE*. If close_file is true, the file will be closed at the
// end. Otherwise, the caller is responsible for closing the file.
QPDF_DLL
void processFile(
char const* description, FILE* file, bool close_file, char const* password = nullptr);
// Parse a PDF file loaded into a memory buffer. This works exactly like processFile except
// that the PDF file is in memory instead of on disk. The description appears in any warning or
// error message in place of the file name.
QPDF_DLL
void processMemoryFile(
char const* description, char const* buf, size_t length, char const* password = nullptr);
// Parse a PDF file loaded from a custom InputSource. If you have your own method of retrieving
// a PDF file, you can subclass InputSource and use this method.
QPDF_DLL
void processInputSource(std::shared_ptr<InputSource>, char const* password = nullptr);
// Create a PDF from an input source that contains JSON as written by writeJSON (or qpdf
// --json-output, version 2 or higher). The JSON must be a complete representation of a PDF. See
// "qpdf JSON" in the manual for details. The input JSON may be arbitrarily large. QPDF does not
// load stream data into memory for more than one stream at a time, even if the stream data is
// specified inline.
QPDF_DLL
void createFromJSON(std::string const& json_file);
QPDF_DLL
void createFromJSON(std::shared_ptr<InputSource>);
// Update a PDF from an input source that contains JSON in the same format as is written by
// writeJSON (or qpdf --json-output, version 2 or higher). Objects in the PDF and not in the
// JSON are not modified. See "qpdf JSON" in the manual for details. As with createFromJSON, the
// input JSON may be arbitrarily large.
QPDF_DLL
void updateFromJSON(std::string const& json_file);
QPDF_DLL
void updateFromJSON(std::shared_ptr<InputSource>);
// Write qpdf JSON format to the pipeline "p". The only supported version is 2. The finish()
// method is not called on the pipeline.
//
// The decode_level parameter controls which streams are uncompressed in the JSON. Use
// qpdf_dl_none to preserve all stream data exactly as it appears in the input. The possible
// values for json_stream_data can be found in qpdf/Constants.h and correspond to the
// --json-stream-data command-line argument. If json_stream_data is qpdf_sj_file, file_prefix
// must be specified. Each stream will be written to a file whose path is constructed by
// appending "-nnn" to file_prefix, where "nnn" is the object number (not zero-filled). If
// wanted_objects is empty, write all objects. Otherwise, write only objects whose keys are in
// wanted_objects. Keys may be either "trailer" or of the form "obj:n n R". Invalid keys are
// ignored. This corresponds to the --json-object command-line argument.
//
// QPDF is efficient with regard to memory when writing, allowing you to write arbitrarily large
// PDF files to a pipeline. You can use a pipeline like Pl_Buffer or Pl_String to capture the
// JSON output in memory, but do so with caution as this will allocate enough memory to hold the
// entire PDF file.
QPDF_DLL
void writeJSON(
int version,
Pipeline* p,
qpdf_stream_decode_level_e decode_level,
qpdf_json_stream_data_e json_stream_data,
std::string const& file_prefix,
std::set<std::string> wanted_objects);
// This version of writeJSON enables writing only the "qpdf" key of an in-progress dictionary.
// If the value of "complete" is true, a complete JSON object containing only the "qpdf" key is
// written to the pipeline. If the value of "complete" is false, the "qpdf" key and its value
// are written to the pipeline assuming that a dictionary is already open. The parameter
// first_key indicates whether this is the first key in an in-progress dictionary. It will be
// set to false by writeJSON. The "qpdf" key and value are written as if at depth 1 in a
// prettified JSON output. Remaining arguments are the same as the above version.
QPDF_DLL
void writeJSON(
int version,
Pipeline* p,
bool complete,
bool& first_key,
qpdf_stream_decode_level_e decode_level,
qpdf_json_stream_data_e json_stream_data,
std::string const& file_prefix,
std::set<std::string> wanted_objects);
// Close or otherwise release the input source. Once this has been called, no other methods of
// qpdf can be called safely except for getWarnings and anyWarnings(). After this has been
// called, it is safe to perform operations on the input file such as deleting or renaming it.
QPDF_DLL
void closeInputSource();
// For certain forensic or investigatory purposes, it may sometimes be useful to specify the
// encryption key directly, even though regular PDF applications do not provide a way to do
// this. Calling setPasswordIsHexKey(true) before calling any of the process methods will bypass
// the normal encryption key computation or recovery mechanisms and interpret the bytes in the
// password as a hex-encoded encryption key. Note that we hex-encode the key because it may
// contain null bytes and therefore can't be represented in a char const*.
QPDF_DLL
void setPasswordIsHexKey(bool);
// Create a QPDF object for an empty PDF. This PDF has no pages or objects other than a minimal
// trailer, a document catalog, and a /Pages tree containing zero pages. Pages and other
// objects can be added to the file in the normal way, and the trailer and document catalog can
// be mutated. Calling this method is equivalent to calling processFile on an equivalent PDF
// file. See the pdf-create.cc example for a demonstration of how to use this method to create
// a PDF file from scratch.
QPDF_DLL
void emptyPDF();
// From 10.1: register a new filter implementation for a specific stream filter. You can add
// your own implementations for new filter types or override existing ones provided by the
// library. Registered stream filters are used for decoding only as you can override encoding
// with stream data providers. For example, you could use this method to add support for one of
// the other filter types by using additional third-party libraries that qpdf does not presently
// use. The standard filters are implemented using QPDFStreamFilter classes.
QPDF_DLL
static void registerStreamFilter(
std::string const& filter_name, std::function<std::shared_ptr<QPDFStreamFilter>()> factory);
// Parameter settings
// To capture or redirect output, configure the logger returned by getLogger(). By default, all
// QPDF and QPDFJob objects share the global logger. If you need a private logger for some
// reason, pass a new one to setLogger(). See comments in QPDFLogger.hh for details on
// configuring the logger.
//
// Note that no normal QPDF operations generate output to standard output, so for applications
// that just wish to avoid creating output for warnings and don't call any check functions,
// calling setSuppressWarnings(true) is sufficient.
QPDF_DLL
std::shared_ptr<QPDFLogger> getLogger();
QPDF_DLL
void setLogger(std::shared_ptr<QPDFLogger>);
// This deprecated method is the old way to capture output, but it didn't capture all output.
// See comments above for getLogger and setLogger. This will be removed in QPDF 12. For now, it
// configures a private logger, separating this object from the default logger, and calls
// setOutputStreams on that logger. See QPDFLogger.hh for additional details.
[[deprecated("configure logger from getLogger() or call setLogger()")]] QPDF_DLL void
setOutputStreams(std::ostream* out_stream, std::ostream* err_stream);
// If true, ignore any cross-reference streams in a hybrid file (one that contains both
// cross-reference streams and cross-reference tables). This can be useful for testing to
// ensure that a hybrid file would work with an older reader.
QPDF_DLL
void setIgnoreXRefStreams(bool);
// By default, any warnings are issued to std::cerr or the error stream specified in a call to
// setOutputStreams as they are encountered. If this method is called with a true value,
// reporting of warnings is suppressed. You may still retrieve warnings by calling getWarnings.
QPDF_DLL
void setSuppressWarnings(bool);
// By default, QPDF will try to recover if it finds certain types of errors in PDF files. If
// turned off, it will throw an exception on the first such problem it finds without attempting
// recovery.
QPDF_DLL
void setAttemptRecovery(bool);
// Tell other QPDF objects that streams copied from this QPDF need to be fully copied when
// copyForeignObject is called on them. Calling setIgnoreXRefStreams(true) on a QPDF object
// makes it possible for the object and its input source to disappear before streams copied from
// it are written with the destination QPDF object. Confused? Ordinarily, if you are going to
// copy objects from a source QPDF object to a destination QPDF object using copyForeignObject
// or addPage, the source object's input source must stick around until after the destination
// PDF is written. If you call this method on the source QPDF object, it sends a signal to the
// destination object that it must fully copy the stream data when copyForeignObject. It will do
// this by making a copy in RAM. Ordinarily the stream data is copied lazily to avoid
// unnecessary duplication of the stream data. Note that the stream data is copied into RAM only
// once regardless of how many objects the stream is copied into. The result is that, if you
// called setImmediateCopyFrom(true) on a given QPDF object prior to copying any of its streams,
// you do not need to keep it or its input source around after copying its objects to another
// QPDF. This is true even if the source streams use StreamDataProvider. Note that this method
// is called on the QPDF object you are copying FROM, not the one you are copying to. The
// reasoning for this is that there's no reason a given QPDF may not get objects copied to it
// from a variety of other objects, some transient and some not. Since what's relevant is
// whether the source QPDF is transient, the method must be called on the source QPDF, not the
// destination one. This method will make a copy of the stream in RAM, so be sure you have
// enough memory to simultaneously hold all the streams you're copying.
QPDF_DLL
void setImmediateCopyFrom(bool);
// Other public methods
// Return the list of warnings that have been issued so far and clear the list. This method may
// be called even if processFile throws an exception. Note that if setSuppressWarnings was not
// called or was called with a false value, any warnings retrieved here will have already been
// output.
QPDF_DLL
std::vector<QPDFExc> getWarnings();
// Indicate whether any warnings have been issued so far. Does not clear the list of warnings.
QPDF_DLL
bool anyWarnings() const;
// Indicate the number of warnings that have been issued since the last call to getWarnings.
// Does not clear the list of warnings.
QPDF_DLL
size_t numWarnings() const;
// Return an application-scoped unique ID for this QPDF object. This is not a globally unique
// ID. It is constructed using a timestamp and a random number and is intended to be unique
// among QPDF objects that are created by a single run of an application. While it's very likely
// that these are actually globally unique, it is not recommended to use them for long-term
// purposes.
QPDF_DLL
unsigned long long getUniqueId() const;
// Issue a warning on behalf of this QPDF object. It will be emitted with other warnings,
// following warning suppression rules, and it will be available with getWarnings().
QPDF_DLL
void warn(QPDFExc const& e);
// Same as above but creates the QPDFExc object using the arguments passed to warn. The filename
// argument to QPDFExc is omitted. This method uses the filename associated with the QPDF
// object.
QPDF_DLL
void warn(
qpdf_error_code_e error_code,
std::string const& object,
qpdf_offset_t offset,
std::string const& message);
// Return the filename associated with the QPDF object.
QPDF_DLL
std::string getFilename() const;
// Return PDF Version and extension level together as a PDFVersion object
QPDF_DLL
PDFVersion getVersionAsPDFVersion();
// Return just the PDF version from the file
QPDF_DLL
std::string getPDFVersion() const;
QPDF_DLL
int getExtensionLevel();
QPDF_DLL
QPDFObjectHandle getTrailer();
QPDF_DLL
QPDFObjectHandle getRoot();
QPDF_DLL
std::map<QPDFObjGen, QPDFXRefEntry> getXRefTable();
// Public factory methods
// Create a new stream. A subsequent call must be made to replaceStreamData() to provide data
// for the stream. The stream's dictionary may be retrieved by calling getDict(), and the
// resulting dictionary may be modified. Alternatively, you can create a new dictionary and
// call replaceDict to install it.
QPDF_DLL
QPDFObjectHandle newStream();
// Create a new stream. Use the given buffer as the stream data. The stream dictionary's
// /Length key will automatically be set to the size of the data buffer. If additional keys are
// required, the stream's dictionary may be retrieved by calling getDict(), and the resulting
// dictionary may be modified. This method is just a convenient wrapper around the newStream()
// and replaceStreamData(). It is a convenience methods for streams that require no parameters
// beyond the stream length. Note that you don't have to deal with compression yourself if you
// use QPDFWriter. By default, QPDFWriter will automatically compress uncompressed stream data.
// Example programs are provided that illustrate this.
QPDF_DLL
QPDFObjectHandle newStream(std::shared_ptr<Buffer> data);
// Create new stream with data from string. This method will create a copy of the data rather
// than using the user-provided buffer as in the std::shared_ptr<Buffer> version of newStream.
QPDF_DLL
QPDFObjectHandle newStream(std::string const& data);
// A reserved object is a special sentinel used for qpdf to reserve a spot for an object that is
// going to be added to the QPDF object. Normally you don't have to use this type since you can
// just call QPDF::makeIndirectObject. However, in some cases, if you have to create objects
// with circular references, you may need to create a reserved object so that you can have a
// reference to it and then replace the object later. Reserved objects have the special
// property that they can't be resolved to direct objects. This makes it possible to replace a
// reserved object with a new object while preserving existing references to them. When you are
// ready to replace a reserved object with its replacement, use QPDF::replaceReserved for this
// purpose rather than the more general QPDF::replaceObject. It is an error to try to write a
// QPDF with QPDFWriter if it has any reserved objects in it.
QPDF_DLL
QPDFObjectHandle newReserved();
QPDF_DLL
QPDFObjectHandle newIndirectNull();
// Install this object handle as an indirect object and return an indirect reference to it.
QPDF_DLL
QPDFObjectHandle makeIndirectObject(QPDFObjectHandle);
// Retrieve an object by object ID and generation. Returns an indirect reference to it. The
// getObject() methods were added for qpdf 11.
QPDF_DLL
QPDFObjectHandle getObject(QPDFObjGen const&);
QPDF_DLL
QPDFObjectHandle getObject(int objid, int generation);
// These are older methods, but there is no intention to deprecate
// them.
QPDF_DLL
QPDFObjectHandle getObjectByObjGen(QPDFObjGen const&);
QPDF_DLL
QPDFObjectHandle getObjectByID(int objid, int generation);
// Replace the object with the given object id with the given object. The object handle passed
// in must be a direct object, though it may contain references to other indirect objects within
// it. Prior to qpdf 10.2.1, after calling this method, existing QPDFObjectHandle instances that
// pointed to the original object still pointed to the original object, resulting in confusing
// and incorrect behavior. This was fixed in 10.2.1, so existing QPDFObjectHandle objects will
// start pointing to the newly replaced object. Note that replacing an object with
// QPDFObjectHandle::newNull() effectively removes the object from the file since a non-existent
// object is treated as a null object. To replace a reserved object, call replaceReserved
// instead.
QPDF_DLL
void replaceObject(QPDFObjGen const& og, QPDFObjectHandle);
QPDF_DLL
void replaceObject(int objid, int generation, QPDFObjectHandle);
// Swap two objects given by ID. Prior to qpdf 10.2.1, existing QPDFObjectHandle instances that
// reference them objects not notice the swap, but this was fixed in 10.2.1.
QPDF_DLL
void swapObjects(QPDFObjGen const& og1, QPDFObjGen const& og2);
QPDF_DLL
void swapObjects(int objid1, int generation1, int objid2, int generation2);
// Replace a reserved object. This is a wrapper around replaceObject but it guarantees that the
// underlying object is a reserved object or a null object. After this call, reserved will
// be a reference to replacement.
QPDF_DLL
void replaceReserved(QPDFObjectHandle reserved, QPDFObjectHandle replacement);
// Copy an object from another QPDF to this one. Starting with qpdf version 8.3.0, it is no
// longer necessary to keep the original QPDF around after the call to copyForeignObject as long
// as the source of any copied stream data is still available. Usually this means you just have
// to keep the input file around, not the QPDF object. The exception to this is if you copy a
// stream that gets its data from a QPDFObjectHandle::StreamDataProvider. In this case only, the
// original stream's QPDF object must stick around because the QPDF object is itself the source
// of the original stream data. For a more in-depth discussion, please see the TODO file.
// Starting in 8.4.0, you can call setImmediateCopyFrom(true) on the SOURCE QPDF object (the one
// you're copying FROM). If you do this prior to copying any of its objects, then neither the
// source QPDF object nor its input source needs to stick around at all regardless of the
// source. The cost is that the stream data is copied into RAM at the time copyForeignObject is
// called. See setImmediateCopyFrom for more information.
//
// The return value of this method is an indirect reference to the copied object in this file.
// This method is intended to be used to copy non-page objects. To copy page objects, pass the
// foreign page object directly to addPage (or addPageAt). If you copy objects that contain
// references to pages, you should copy the pages first using addPage(At). Otherwise references
// to the pages that have not been copied will be replaced with nulls. It is possible to use
// copyForeignObject on page objects if you are not going to use them as pages. Doing so copies
// the object normally but does not update the page structure. For example, it is a valid use
// case to use copyForeignObject for a page that you are going to turn into a form XObject,
// though you can also use QPDFPageObjectHelper::getFormXObjectForPage for that purpose.
//
// When copying objects with this method, object structure will be preserved, so all indirectly
// referenced indirect objects will be copied as well. This includes any circular references
// that may exist. The QPDF object keeps a record of what has already been copied, so shared
// objects will not be copied multiple times. This also means that if you mutate an object that
// has already been copied and try to copy it again, it won't work since the modified object
// will not be recopied. Therefore, you should do all mutation on the original file that you
// are going to do before you start copying its objects to a new file.
QPDF_DLL
QPDFObjectHandle copyForeignObject(QPDFObjectHandle foreign);
// Encryption support
enum encryption_method_e { e_none, e_unknown, e_rc4, e_aes, e_aesv3 };
class EncryptionData
{
public:
// This class holds data read from the encryption dictionary.
EncryptionData(
int V,
int R,
int Length_bytes,
int P,
std::string const& O,
std::string const& U,
std::string const& OE,
std::string const& UE,
std::string const& Perms,
std::string const& id1,
bool encrypt_metadata) :
V(V),
R(R),
Length_bytes(Length_bytes),
P(P),
O(O),
U(U),
OE(OE),
UE(UE),
Perms(Perms),
id1(id1),
encrypt_metadata(encrypt_metadata)
{
}
int getV() const;
int getR() const;
int getLengthBytes() const;
int getP() const;
std::string const& getO() const;
std::string const& getU() const;
std::string const& getOE() const;
std::string const& getUE() const;
std::string const& getPerms() const;
std::string const& getId1() const;
bool getEncryptMetadata() const;
void setO(std::string const&);
void setU(std::string const&);
void setV5EncryptionParameters(
std::string const& O,
std::string const& OE,
std::string const& U,
std::string const& UE,
std::string const& Perms);
private:
EncryptionData(EncryptionData const&) = delete;
EncryptionData& operator=(EncryptionData const&) = delete;
int V;
int R;
int Length_bytes;
int P;
std::string O;
std::string U;
std::string OE;
std::string UE;
std::string Perms;
std::string id1;
bool encrypt_metadata;
};
QPDF_DLL
bool isEncrypted() const;
QPDF_DLL
bool isEncrypted(int& R, int& P);
QPDF_DLL
bool isEncrypted(
int& R,
int& P,
int& V,
encryption_method_e& stream_method,
encryption_method_e& string_method,
encryption_method_e& file_method);
QPDF_DLL
bool ownerPasswordMatched() const;
QPDF_DLL
bool userPasswordMatched() const;
// Encryption permissions -- not enforced by QPDF
QPDF_DLL
bool allowAccessibility();
QPDF_DLL
bool allowExtractAll();
QPDF_DLL
bool allowPrintLowRes();
QPDF_DLL
bool allowPrintHighRes();
QPDF_DLL
bool allowModifyAssembly();
QPDF_DLL
bool allowModifyForm();
QPDF_DLL
bool allowModifyAnnotation();
QPDF_DLL
bool allowModifyOther();
QPDF_DLL
bool allowModifyAll();
// Helper function to trim padding from user password. Calling trim_user_password on the result
// of getPaddedUserPassword gives getTrimmedUserPassword's result.
QPDF_DLL
static void trim_user_password(std::string& user_password);
QPDF_DLL
static std::string compute_data_key(
std::string const& encryption_key,
int objid,
int generation,
bool use_aes,
int encryption_V,
int encryption_R);
QPDF_DLL
static std::string
compute_encryption_key(std::string const& password, EncryptionData const& data);
QPDF_DLL
static void compute_encryption_O_U(
char const* user_password,
char const* owner_password,
int V,
int R,
int key_len,
int P,
bool encrypt_metadata,
std::string const& id1,
std::string& O,
std::string& U);
QPDF_DLL
static void compute_encryption_parameters_V5(
char const* user_password,
char const* owner_password,
int V,
int R,
int key_len,
int P,
bool encrypt_metadata,
std::string const& id1,
std::string& encryption_key,
std::string& O,
std::string& U,
std::string& OE,
std::string& UE,
std::string& Perms);
// Return the full user password as stored in the PDF file. For files encrypted with 40-bit or
// 128-bit keys, the user password can be recovered when the file is opened using the owner
// password. This is not possible with newer encryption formats. If you are attempting to
// recover the user password in a user-presentable form, call getTrimmedUserPassword() instead.
QPDF_DLL
std::string const& getPaddedUserPassword() const;
// Return human-readable form of user password subject to same limitations as
// getPaddedUserPassword().
QPDF_DLL
std::string getTrimmedUserPassword() const;
// Return the previously computed or retrieved encryption key for this file
QPDF_DLL
std::string getEncryptionKey() const;
// Remove security restrictions associated with digitally signed files. From qpdf 11.7.0, this
// is called by QPDFAcroFormDocumentHelper::disableDigitalSignatures and is more useful when
// called from there than when just called by itself.
QPDF_DLL
void removeSecurityRestrictions();
// Linearization support
// Returns true iff the file starts with a linearization parameter dictionary. Does no
// additional validation.
QPDF_DLL
bool isLinearized();
// Performs various sanity checks on a linearized file. Return true if no errors or warnings.
// Otherwise, return false and output errors and warnings to the default output stream
// (std::cout or whatever is configured in the logger). It is recommended for linearization
// errors to be treated as warnings.
QPDF_DLL
bool checkLinearization();
// Calls checkLinearization() and, if possible, prints normalized contents of some of the hints
// tables to the default output stream. Normalization includes adding min values to delta values
// and adjusting offsets based on the location and size of the primary hint stream.
QPDF_DLL
void showLinearizationData();
// Shows the contents of the cross-reference table
QPDF_DLL
void showXRefTable();
// Starting from qpdf 11.0 user code should not need to call this method. Before 11.0 this
// method was used to detect all indirect references to objects that don't exist and resolve
// them by replacing them with null, which is how the PDF spec says to interpret such dangling
// references. This method is called automatically when you try to add any new objects, if you
// call getAllObjects, and before a file is written. The qpdf object caches whether it has run
// this to avoid running it multiple times. Before 11.2.1 you could pass true to force it to run
// again if you had explicitly added new objects that may have additional dangling references.
QPDF_DLL
void fixDanglingReferences(bool force = false);
// Return the approximate number of indirect objects. It is/ approximate because not all objects
// in the file are preserved in all cases, and gaps in object numbering are not preserved.
QPDF_DLL
size_t getObjectCount();
// Returns a list of indirect objects for every object in the xref table. Useful for discovering
// objects that are not otherwise referenced.
QPDF_DLL
std::vector<QPDFObjectHandle> getAllObjects();
// Optimization support -- see doc/optimization. Implemented in QPDF_optimization.cc
// The object_stream_data map maps from a "compressed" object to the object stream that contains
// it. This enables optimize to populate the object <-> user maps with only uncompressed
// objects. If allow_changes is false, an exception will be thrown if any changes are made
// during the optimization process. This is available so that the test suite can make sure that
// a linearized file is already optimized. When called in this way, optimize() still populates
// the object <-> user maps. The optional skip_stream_parameters parameter, if present, is
// called for each stream object. The function should return 2 if optimization should discard
// /Length, /Filter, and /DecodeParms; 1 if it should discard /Length, and 0 if it should
// preserve all keys. This is used by QPDFWriter to avoid creation of dangling objects for
// stream dictionary keys it will be regenerating.
QPDF_DLL
void optimize(
std::map<int, int> const& object_stream_data,
bool allow_changes = true,
std::function<int(QPDFObjectHandle&)> skip_stream_parameters = nullptr);
// Traverse page tree return all /Page objects. It also detects and resolves cases in which the
// same /Page object is duplicated. For efficiency, this method returns a const reference to an
// internal vector of pages. Calls to addPage, addPageAt, and removePage safely update this, but
// directly manipulation of the pages tree or pushing inheritable objects to the page level may
// invalidate it. See comments for updateAllPagesCache() for additional notes. Newer code should
// use QPDFPageDocumentHelper::getAllPages instead. The decision to expose this internal cache
// was arguably incorrect, but it is being left here for compatibility. It is, however,
// completely safe to use this for files that you are not modifying.
QPDF_DLL
std::vector<QPDFObjectHandle> const& getAllPages();
QPDF_DLL
bool everCalledGetAllPages() const;
QPDF_DLL
bool everPushedInheritedAttributesToPages() const;
// These methods, given a page object or its object/generation number, returns the 0-based index
// into the array returned by getAllPages() for that page. An exception is thrown if the page is
// not found.
QPDF_DLL
int findPage(QPDFObjGen const& og);
QPDF_DLL
int findPage(QPDFObjectHandle& page);
// This method synchronizes QPDF's cache of the page structure with the actual /Pages tree. If
// you restrict changes to the /Pages tree, including addition, removal, or replacement of pages
// or changes to any /Pages objects, to calls to these page handling APIs, you never need to
// call this method. If you modify /Pages structures directly, you must call this method
// afterwards. This method updates the internal list of pages, so after calling this method,
// any previous references returned by getAllPages() will be valid again. It also resets any
// state about having pushed inherited attributes in /Pages objects down to the pages, so if you
// add any inheritable attributes to a /Pages object, you should also call this method.
QPDF_DLL
void updateAllPagesCache();
// Legacy handling API. These methods are not going anywhere, and you should feel free to
// continue using them if it simplifies your code. Newer code should make use of
// QPDFPageDocumentHelper instead as future page handling methods will be added there. The
// functionality and specification of these legacy methods is identical to the identically named
// methods there, except that these versions use QPDFObjectHandle instead of
// QPDFPageObjectHelper, so please see comments in that file for descriptions. There are
// subtleties you need to know about, so please look at the comments there.
QPDF_DLL
void pushInheritedAttributesToPage();
QPDF_DLL
void addPage(QPDFObjectHandle newpage, bool first);
QPDF_DLL
void addPageAt(QPDFObjectHandle newpage, bool before, QPDFObjectHandle refpage);
QPDF_DLL
void removePage(QPDFObjectHandle page);
// End legacy page helpers
// Writer class is restricted to QPDFWriter so that only it can call certain methods.
class Writer
{
friend class QPDFWriter;
private:
static void
getLinearizedParts(
QPDF& qpdf,
std::map<int, int> const& object_stream_data,
std::vector<QPDFObjectHandle>& part4,
std::vector<QPDFObjectHandle>& part6,
std::vector<QPDFObjectHandle>& part7,
std::vector<QPDFObjectHandle>& part8,
std::vector<QPDFObjectHandle>& part9)
{
qpdf.getLinearizedParts(object_stream_data, part4, part6, part7, part8, part9);
}
static void
generateHintStream(
QPDF& qpdf,
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, qpdf_offset_t> const& lengths,
std::map<int, int> const& obj_renumber,
std::shared_ptr<Buffer>& hint_stream,
int& S,
int& O,
bool compressed)
{
return qpdf.generateHintStream(
xref, lengths, obj_renumber, hint_stream, S, O, compressed);
}
static void
getObjectStreamData(QPDF& qpdf, std::map<int, int>& omap)
{
qpdf.getObjectStreamData(omap);
}
static std::vector<QPDFObjGen>
getCompressibleObjGens(QPDF& qpdf)
{
return qpdf.getCompressibleObjGens();
}
};
// The Resolver class is restricted to QPDFObject so that only it can resolve indirect
// references.
class Resolver
{
friend class QPDFObject;
private:
static void
resolve(QPDF* qpdf, QPDFObjGen const& og)
{
qpdf->resolve(og);
}
};
// StreamCopier class is restricted to QPDFObjectHandle so it can copy stream data.
class StreamCopier
{
friend class QPDFObjectHandle;
private:
static void
copyStreamData(QPDF* qpdf, QPDFObjectHandle const& dest, QPDFObjectHandle const& src)
{
qpdf->copyStreamData(dest, src);
}
};
// The ParseGuard class allows QPDFParser to detect re-entrant parsing.
class ParseGuard
{
friend class QPDFParser;
private:
ParseGuard(QPDF* qpdf) :
qpdf(qpdf)
{
if (qpdf) {
qpdf->inParse(true);
}
}
~ParseGuard()
{
if (qpdf) {
qpdf->inParse(false);
}
}
QPDF* qpdf;
};
// Pipe class is restricted to QPDF_Stream.
class Pipe
{
friend class QPDF_Stream;
private:
static bool
pipeStreamData(
QPDF* qpdf,
QPDFObjGen const& og,
qpdf_offset_t offset,
size_t length,
QPDFObjectHandle dict,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry)
{
return qpdf->pipeStreamData(
og, offset, length, dict, pipeline, suppress_warnings, will_retry);
}
};
// JobSetter class is restricted to QPDFJob.
class JobSetter
{
friend class QPDFJob;
private:
// Enable enhanced warnings for pdf file checking.
static void
setCheckMode(QPDF& qpdf, bool val)
{
qpdf.m->check_mode = val;
}
};
// For testing only -- do not add to DLL
static bool test_json_validators();
private:
// It has never been safe to copy QPDF objects as there is code in the library that assumes
// there are no copies of a QPDF object. Copying QPDF objects was not prevented by the API until
// qpdf 11. If you have been copying QPDF objects, use std::shared_ptr<QPDF> instead. From qpdf
// 11, you can use QPDF::create to create them.
QPDF(QPDF const&) = delete;
QPDF& operator=(QPDF const&) = delete;
static std::string const qpdf_version;
class ObjCache
{
public:
ObjCache() :
end_before_space(0),
end_after_space(0)
{
}
ObjCache(
std::shared_ptr<QPDFObject> object,
qpdf_offset_t end_before_space,
qpdf_offset_t end_after_space) :
object(object),
end_before_space(end_before_space),
end_after_space(end_after_space)
{
}
std::shared_ptr<QPDFObject> object;
qpdf_offset_t end_before_space;
qpdf_offset_t end_after_space;
};
class ObjCopier
{
public:
std::map<QPDFObjGen, QPDFObjectHandle> object_map;
std::vector<QPDFObjectHandle> to_copy;
QPDFObjGen::set visiting;
};
class EncryptionParameters
{
friend class QPDF;
public:
EncryptionParameters();
private:
bool encrypted;
bool encryption_initialized;
int encryption_V;
int encryption_R;
bool encrypt_metadata;
std::map<std::string, encryption_method_e> crypt_filters;
encryption_method_e cf_stream;
encryption_method_e cf_string;
encryption_method_e cf_file;
std::string provided_password;
std::string user_password;
std::string encryption_key;
std::string cached_object_encryption_key;
QPDFObjGen cached_key_og;
bool user_password_matched;
bool owner_password_matched;
};
class ForeignStreamData
{
friend class QPDF;
public:
ForeignStreamData(
std::shared_ptr<EncryptionParameters> encp,
std::shared_ptr<InputSource> file,
QPDFObjGen const& foreign_og,
qpdf_offset_t offset,
size_t length,
QPDFObjectHandle local_dict);
private:
std::shared_ptr<EncryptionParameters> encp;
std::shared_ptr<InputSource> file;
QPDFObjGen foreign_og;
qpdf_offset_t offset;
size_t length;
QPDFObjectHandle local_dict;
};
class CopiedStreamDataProvider: public QPDFObjectHandle::StreamDataProvider
{
public:
CopiedStreamDataProvider(QPDF& destination_qpdf);
~CopiedStreamDataProvider() override = default;
bool provideStreamData(
QPDFObjGen const& og,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry) override;
void registerForeignStream(QPDFObjGen const& local_og, QPDFObjectHandle foreign_stream);
void registerForeignStream(QPDFObjGen const& local_og, std::shared_ptr<ForeignStreamData>);
private:
QPDF& destination_qpdf;
std::map<QPDFObjGen, QPDFObjectHandle> foreign_streams;
std::map<QPDFObjGen, std::shared_ptr<ForeignStreamData>> foreign_stream_data;
};
class StringDecrypter: public QPDFObjectHandle::StringDecrypter
{
friend class QPDF;
public:
StringDecrypter(QPDF* qpdf, QPDFObjGen const& og);
~StringDecrypter() override = default;
void decryptString(std::string& val) override;
private:
QPDF* qpdf;
QPDFObjGen og;
};
class ResolveRecorder
{
public:
ResolveRecorder(QPDF* qpdf, QPDFObjGen const& og) :
qpdf(qpdf),
iter(qpdf->m->resolving.insert(og).first)
{
}
virtual ~ResolveRecorder()
{
this->qpdf->m->resolving.erase(iter);
}
private:
QPDF* qpdf;
std::set<QPDFObjGen>::const_iterator iter;
};
class JSONReactor;
void parse(char const* password);
void inParse(bool);
void setTrailer(QPDFObjectHandle obj);
void read_xref(qpdf_offset_t offset);
bool resolveXRefTable();
void reconstruct_xref(QPDFExc& e);
bool parse_xrefFirst(std::string const& line, int& obj, int& num, int& bytes);
bool parse_xrefEntry(std::string const& line, qpdf_offset_t& f1, int& f2, char& type);
qpdf_offset_t read_xrefTable(qpdf_offset_t offset);
qpdf_offset_t read_xrefStream(qpdf_offset_t offset);
qpdf_offset_t processXRefStream(qpdf_offset_t offset, QPDFObjectHandle& xref_stream);
void insertXrefEntry(int obj, int f0, qpdf_offset_t f1, int f2);
void insertFreeXrefEntry(QPDFObjGen);
void insertReconstructedXrefEntry(int obj, qpdf_offset_t f1, int f2);
void setLastObjectDescription(std::string const& description, QPDFObjGen const& og);
QPDFObjectHandle readTrailer();
QPDFObjectHandle readObject(std::string const& description, QPDFObjGen og);
void readStream(QPDFObjectHandle& object, QPDFObjGen og, qpdf_offset_t offset);
void validateStreamLineEnd(QPDFObjectHandle& object, QPDFObjGen og, qpdf_offset_t offset);
QPDFObjectHandle readObjectInStream(std::shared_ptr<InputSource>& input, int obj);
size_t recoverStreamLength(
std::shared_ptr<InputSource> input, QPDFObjGen const& og, qpdf_offset_t stream_offset);
QPDFTokenizer::Token readToken(std::shared_ptr<InputSource>, size_t max_len = 0);
QPDFObjectHandle readObjectAtOffset(
bool attempt_recovery,
qpdf_offset_t offset,
std::string const& description,
QPDFObjGen exp_og,
QPDFObjGen& og,
bool skip_cache_if_in_xref);
void resolve(QPDFObjGen og);
void resolveObjectsInStream(int obj_stream_number);
void stopOnError(std::string const& message);
QPDFObjectHandle reserveObjectIfNotExists(QPDFObjGen const& og);
QPDFObjectHandle reserveStream(QPDFObjGen const& og);
QPDFObjGen nextObjGen();
QPDFObjectHandle newIndirect(QPDFObjGen const&, std::shared_ptr<QPDFObject> const&);
QPDFObjectHandle makeIndirectFromQPDFObject(std::shared_ptr<QPDFObject> const& obj);
bool isCached(QPDFObjGen const& og);
bool isUnresolved(QPDFObjGen const& og);
void removeObject(QPDFObjGen og);
void updateCache(
QPDFObjGen const& og,
std::shared_ptr<QPDFObject> const& object,
qpdf_offset_t end_before_space,
qpdf_offset_t end_after_space);
static QPDFExc damagedPDF(
std::shared_ptr<InputSource> const& input,
std::string const& object,
qpdf_offset_t offset,
std::string const& message);
QPDFExc damagedPDF(
std::shared_ptr<InputSource> const& input,
qpdf_offset_t offset,
std::string const& message);
QPDFExc damagedPDF(std::string const& object, qpdf_offset_t offset, std::string const& message);
QPDFExc damagedPDF(std::string const& object, std::string const& message);
QPDFExc damagedPDF(qpdf_offset_t offset, std::string const& message);
QPDFExc damagedPDF(std::string const& message);
// Calls finish() on the pipeline when done but does not delete it
bool pipeStreamData(
QPDFObjGen const& og,
qpdf_offset_t offset,
size_t length,
QPDFObjectHandle dict,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry);
bool pipeForeignStreamData(
std::shared_ptr<ForeignStreamData>, Pipeline*, bool suppress_warnings, bool will_retry);
static bool pipeStreamData(
std::shared_ptr<QPDF::EncryptionParameters> encp,
std::shared_ptr<InputSource> file,
QPDF& qpdf_for_warning,
QPDFObjGen const& og,
qpdf_offset_t offset,
size_t length,
QPDFObjectHandle dict,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry);
// For QPDFWriter:
// Get lists of all objects in order according to the part of a linearized file that they belong
// to.
void getLinearizedParts(
std::map<int, int> const& object_stream_data,
std::vector<QPDFObjectHandle>& part4,
std::vector<QPDFObjectHandle>& part6,
std::vector<QPDFObjectHandle>& part7,
std::vector<QPDFObjectHandle>& part8,
std::vector<QPDFObjectHandle>& part9);
void generateHintStream(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, qpdf_offset_t> const& lengths,
std::map<int, int> const& obj_renumber,
std::shared_ptr<Buffer>& hint_stream,
int& S,
int& O,
bool compressed);
// Map object to object stream that contains it
void getObjectStreamData(std::map<int, int>&);
// Get a list of objects that would be permitted in an object stream.
std::vector<QPDFObjGen> getCompressibleObjGens();
// methods to support page handling
void getAllPagesInternal(
QPDFObjectHandle cur_pages,
QPDFObjGen::set& visited,
QPDFObjGen::set& seen,
bool media_box);
void insertPage(QPDFObjectHandle newpage, int pos);
void flattenPagesTree();
void insertPageobjToPage(QPDFObjectHandle const& obj, int pos, bool check_duplicate);
// methods to support encryption -- implemented in QPDF_encryption.cc
static encryption_method_e
interpretCF(std::shared_ptr<EncryptionParameters> encp, QPDFObjectHandle);
void initializeEncryption();
static std::string
getKeyForObject(std::shared_ptr<EncryptionParameters> encp, QPDFObjGen const& og, bool use_aes);
void decryptString(std::string&, QPDFObjGen const& og);
static std::string
compute_encryption_key_from_password(std::string const& password, EncryptionData const& data);
static std::string
recover_encryption_key_with_password(std::string const& password, EncryptionData const& data);
static std::string recover_encryption_key_with_password(
std::string const& password, EncryptionData const& data, bool& perms_valid);
static void decryptStream(
std::shared_ptr<EncryptionParameters> encp,
std::shared_ptr<InputSource> file,
QPDF& qpdf_for_warning,
Pipeline*& pipeline,
QPDFObjGen const& og,
QPDFObjectHandle& stream_dict,
std::unique_ptr<Pipeline>& heap);
// Methods to support object copying
void reserveObjects(QPDFObjectHandle foreign, ObjCopier& obj_copier, bool top);
QPDFObjectHandle
replaceForeignIndirectObjects(QPDFObjectHandle foreign, ObjCopier& obj_copier, bool top);
void copyStreamData(QPDFObjectHandle dest_stream, QPDFObjectHandle src_stream);
// Linearization Hint table structures.
// Naming conventions:
// HSomething is the Something Hint Table or table header
// HSomethingEntry is an entry in the Something table
// delta_something + min_something = something
// nbits_something = number of bits required for something
// something_offset is the pre-adjusted offset in the file. If >=
// H0_offset, H0_length must be added to get an actual file
// offset.
// PDF 1.4: Table F.4
struct HPageOffsetEntry
{
int delta_nobjects{0}; // 1
qpdf_offset_t delta_page_length{0}; // 2
// vectors' sizes = nshared_objects
int nshared_objects{0}; // 3
std::vector<int> shared_identifiers; // 4
std::vector<int> shared_numerators; // 5
qpdf_offset_t delta_content_offset{0}; // 6
qpdf_offset_t delta_content_length{0}; // 7
};
// PDF 1.4: Table F.3
struct HPageOffset
{
int min_nobjects{0}; // 1
qpdf_offset_t first_page_offset{0}; // 2
int nbits_delta_nobjects{0}; // 3
int min_page_length{0}; // 4
int nbits_delta_page_length{0}; // 5
int min_content_offset{0}; // 6
int nbits_delta_content_offset{0}; // 7
int min_content_length{0}; // 8
int nbits_delta_content_length{0}; // 9
int nbits_nshared_objects{0}; // 10
int nbits_shared_identifier{0}; // 11
int nbits_shared_numerator{0}; // 12
int shared_denominator{0}; // 13
// vector size is npages
std::vector<HPageOffsetEntry> entries;
};
// PDF 1.4: Table F.6
struct HSharedObjectEntry
{
// Item 3 is a 128-bit signature (unsupported by Acrobat)
int delta_group_length{0}; // 1
int signature_present{0}; // 2 -- always 0
int nobjects_minus_one{0}; // 4 -- always 0
};
// PDF 1.4: Table F.5
struct HSharedObject
{
int first_shared_obj{0}; // 1
qpdf_offset_t first_shared_offset{0}; // 2
int nshared_first_page{0}; // 3
int nshared_total{0}; // 4
int nbits_nobjects{0}; // 5
int min_group_length{0}; // 6
int nbits_delta_group_length{0}; // 7
// vector size is nshared_total
std::vector<HSharedObjectEntry> entries;
};
// PDF 1.4: Table F.9
struct HGeneric
{
int first_object{0}; // 1
qpdf_offset_t first_object_offset{0}; // 2
int nobjects{0}; // 3
int group_length{0}; // 4
};
// Other linearization data structures
// Initialized from Linearization Parameter dictionary
struct LinParameters
{
qpdf_offset_t file_size{0}; // /L
int first_page_object{0}; // /O
qpdf_offset_t first_page_end{0}; // /E
int npages{0}; // /N
qpdf_offset_t xref_zero_offset{0}; // /T
int first_page{0}; // /P
qpdf_offset_t H_offset{0}; // offset of primary hint stream
qpdf_offset_t H_length{0}; // length of primary hint stream
};
// Computed hint table value data structures. These tables contain the computed values on which
// the hint table values are based. They exclude things like number of bits and store actual
// values instead of mins and deltas. File offsets are also absolute rather than being offset
// by the size of the primary hint table. We populate the hint table structures from these
// during writing and compare the hint table values with these during validation. We ignore
// some values for various reasons described in the code. Those values are omitted from these
// structures. Note also that object numbers are object numbers from the input file, not the
// output file.
// Naming convention: CHSomething is analogous to HSomething above. "CH" is computed hint.
struct CHPageOffsetEntry
{
int nobjects{0};
int nshared_objects{0};
// vectors' sizes = nshared_objects
std::vector<int> shared_identifiers;
};
struct CHPageOffset
{
// vector size is npages
std::vector<CHPageOffsetEntry> entries;
};
struct CHSharedObjectEntry
{
CHSharedObjectEntry(int object) :
object(object)
{
}
int object;
};
// PDF 1.4: Table F.5
struct CHSharedObject
{
int first_shared_obj{0};
int nshared_first_page{0};
int nshared_total{0};
// vector size is nshared_total
std::vector<CHSharedObjectEntry> entries;
};
// No need for CHGeneric -- HGeneric is fine as is.
// Data structures to support optimization -- implemented in QPDF_optimization.cc
class ObjUser
{
public:
enum user_e { ou_bad, ou_page, ou_thumb, ou_trailer_key, ou_root_key, ou_root };
// type is set to ou_bad
ObjUser();
// type must be ou_root
ObjUser(user_e type);
// type must be one of ou_page or ou_thumb
ObjUser(user_e type, int pageno);
// type must be one of ou_trailer_key or ou_root_key
ObjUser(user_e type, std::string const& key);
bool operator<(ObjUser const&) const;
user_e ou_type;
int pageno; // if ou_page;
std::string key; // if ou_trailer_key or ou_root_key
};
class PatternFinder: public InputSource::Finder
{
public:
PatternFinder(QPDF& qpdf, bool (QPDF::*checker)()) :
qpdf(qpdf),
checker(checker)
{
}
~PatternFinder() override = default;
bool
check() override
{
return (this->qpdf.*checker)();
}
private:
QPDF& qpdf;
bool (QPDF::*checker)();
};
// Methods to support pattern finding
static bool validatePDFVersion(char const*&, std::string& version);
bool findHeader();
bool findStartxref();
bool findEndstream();
// methods to support linearization checking -- implemented in QPDF_linearization.cc
void readLinearizationData();
bool checkLinearizationInternal();
void dumpLinearizationDataInternal();
void linearizationWarning(std::string_view);
QPDFObjectHandle readHintStream(Pipeline&, qpdf_offset_t offset, size_t length);
void readHPageOffset(BitStream);
void readHSharedObject(BitStream);
void readHGeneric(BitStream, HGeneric&);
qpdf_offset_t maxEnd(ObjUser const& ou);
qpdf_offset_t getLinearizationOffset(QPDFObjGen const&);
QPDFObjectHandle
getUncompressedObject(QPDFObjectHandle&, std::map<int, int> const& object_stream_data);
int lengthNextN(int first_object, int n);
void
checkHPageOffset(std::vector<QPDFObjectHandle> const& pages, std::map<int, int>& idx_to_obj);
void
checkHSharedObject(std::vector<QPDFObjectHandle> const& pages, std::map<int, int>& idx_to_obj);
void checkHOutlines();
void dumpHPageOffset();
void dumpHSharedObject();
void dumpHGeneric(HGeneric&);
qpdf_offset_t adjusted_offset(qpdf_offset_t offset);
void calculateLinearizationData(std::map<int, int> const& object_stream_data);
void pushOutlinesToPart(
std::vector<QPDFObjectHandle>& part,
std::set<QPDFObjGen>& lc_outlines,
std::map<int, int> const& object_stream_data);
int outputLengthNextN(
int in_object,
int n,
std::map<int, qpdf_offset_t> const& lengths,
std::map<int, int> const& obj_renumber);
void calculateHPageOffset(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, qpdf_offset_t> const& lengths,
std::map<int, int> const& obj_renumber);
void calculateHSharedObject(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, qpdf_offset_t> const& lengths,
std::map<int, int> const& obj_renumber);
void calculateHOutline(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, qpdf_offset_t> const& lengths,
std::map<int, int> const& obj_renumber);
void writeHPageOffset(BitWriter&);
void writeHSharedObject(BitWriter&);
void writeHGeneric(BitWriter&, HGeneric&);
// Methods to support optimization
void pushInheritedAttributesToPage(bool allow_changes, bool warn_skipped_keys);
void pushInheritedAttributesToPageInternal(
QPDFObjectHandle,
std::map<std::string, std::vector<QPDFObjectHandle>>&,
bool allow_changes,
bool warn_skipped_keys);
void updateObjectMaps(
ObjUser const& ou,
QPDFObjectHandle oh,
std::function<int(QPDFObjectHandle&)> skip_stream_parameters);
void updateObjectMapsInternal(
ObjUser const& ou,
QPDFObjectHandle oh,
std::function<int(QPDFObjectHandle&)> skip_stream_parameters,
QPDFObjGen::set& visited,
bool top);
void filterCompressedObjects(std::map<int, int> const& object_stream_data);
// JSON import
void importJSON(std::shared_ptr<InputSource>, bool must_be_complete);
// Type conversion helper methods
template <typename T>
static qpdf_offset_t
toO(T const& i)
{
return QIntC::to_offset(i);
}
template <typename T>
static size_t
toS(T const& i)
{
return QIntC::to_size(i);
}
template <typename T>
static int
toI(T const& i)
{
return QIntC::to_int(i);
}
template <typename T>
static unsigned long long
toULL(T const& i)
{
return QIntC::to_ulonglong(i);
}
class Members
{
friend class QPDF;
friend class ResolveRecorder;
public:
QPDF_DLL
~Members() = default;
private:
Members();
Members(Members const&) = delete;
std::shared_ptr<QPDFLogger> log;
unsigned long long unique_id{0};
QPDFTokenizer tokenizer;
std::shared_ptr<InputSource> file;
std::string last_object_description;
bool provided_password_is_hex_key{false};
bool ignore_xref_streams{false};
bool suppress_warnings{false};
bool attempt_recovery{true};
bool check_mode{false};
std::shared_ptr<EncryptionParameters> encp;
std::string pdf_version;
std::map<QPDFObjGen, QPDFXRefEntry> xref_table;
std::set<int> deleted_objects;
std::map<QPDFObjGen, ObjCache> obj_cache;
std::set<QPDFObjGen> resolving;
QPDFObjectHandle trailer;
std::vector<QPDFObjectHandle> all_pages;
std::map<QPDFObjGen, int> pageobj_to_pages_pos;
bool pushed_inherited_attributes_to_pages{false};
bool ever_pushed_inherited_attributes_to_pages{false};
bool ever_called_get_all_pages{false};
std::vector<QPDFExc> warnings;
std::map<unsigned long long, ObjCopier> object_copiers;
std::shared_ptr<QPDFObjectHandle::StreamDataProvider> copied_streams;
// copied_stream_data_provider is owned by copied_streams
CopiedStreamDataProvider* copied_stream_data_provider{nullptr};
bool reconstructed_xref{false};
bool fixed_dangling_refs{false};
bool immediate_copy_from{false};
bool in_parse{false};
bool parsed{false};
std::set<int> resolved_object_streams;
// Linearization data
qpdf_offset_t first_xref_item_offset{0}; // actual value from file
bool uncompressed_after_compressed{false};
bool linearization_warnings{false};
// Linearization parameter dictionary and hint table data: may be read from file or computed
// prior to writing a linearized file
QPDFObjectHandle lindict;
LinParameters linp;
HPageOffset page_offset_hints;
HSharedObject shared_object_hints;
HGeneric outline_hints;
// Computed linearization data: used to populate above tables during writing and to compare
// with them during validation. c_ means computed.
LinParameters c_linp;
CHPageOffset c_page_offset_data;
CHSharedObject c_shared_object_data;
HGeneric c_outline_data;
// Object ordering data for linearized files: initialized by calculateLinearizationData().
// Part numbers refer to the PDF 1.4 specification.
std::vector<QPDFObjectHandle> part4;
std::vector<QPDFObjectHandle> part6;
std::vector<QPDFObjectHandle> part7;
std::vector<QPDFObjectHandle> part8;
std::vector<QPDFObjectHandle> part9;
// Optimization data
std::map<ObjUser, std::set<QPDFObjGen>> obj_user_to_objects;
std::map<QPDFObjGen, std::set<ObjUser>> object_to_obj_users;
};
// Keep all member variables inside the Members object, which we dynamically allocate. This
// makes it possible to add new private members without breaking binary compatibility.
std::shared_ptr<Members> m;
};
#endif // QPDF_HH
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