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|
// Copyright (c) 2005-2010 Jay Berkenbilt
//
// This file is part of qpdf. This software may be distributed under
// the terms of version 2 of the Artistic License which may be found
// in the source distribution. It is provided "as is" without express
// or implied warranty.
#ifndef __QPDF_HH__
#define __QPDF_HH__
#include <stdio.h>
#include <string>
#include <map>
#include <list>
#include <iostream>
#include <qpdf/DLL.h>
#include <qpdf/QPDFXRefEntry.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QPDFTokenizer.hh>
#include <qpdf/Buffer.hh>
class QPDF_Stream;
class BitStream;
class BitWriter;
class QPDFExc;
class QPDF
{
public:
// Get the current version of the QPDF software
QPDF_DLL
static std::string const& QPDFVersion();
QPDF_DLL
QPDF();
QPDF_DLL
~QPDF();
// 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.
QPDF_DLL
void processFile(char const* filename, char const* password = 0);
// 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 = 0);
// Parameter settings
// By default, warning messages are issued to std::cerr and output
// messages printed by certain check calls are issued to
// std::cout. This method allows you to specify alternative
// streams for this purpose. Note that no normal QPDF operations
// generate output to std::cout, so for applications that just
// wish to avoid creating output and don't call any check
// functions, calling setSuppressWarnings(true) is sufficient.
// Applications that wish to present check or warning information
// to users may replace the output and error streams to capture
// the output and errors for other use. A null value for either
// stream will cause QPDF to use std::cout or std::cerr as
// appropriate.
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 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);
// 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();
QPDF_DLL
std::string getFilename() const;
QPDF_DLL
std::string getPDFVersion() const;
QPDF_DLL
QPDFObjectHandle getTrailer();
QPDF_DLL
QPDFObjectHandle getRoot();
// 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.
QPDF_DLL
QPDFObjectHandle getObjectByID(int objid, int generation);
// Encryption support
enum encryption_method_e { e_none, e_unknown, e_rc4, e_aes };
struct EncryptionData
{
// 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& id1, bool encrypt_metadata) :
V(V),
R(R),
Length_bytes(Length_bytes),
P(P),
O(O),
U(U),
id1(id1),
encrypt_metadata(encrypt_metadata)
{
}
int V;
int R;
int Length_bytes;
int P;
std::string O;
std::string U;
std::string id1;
bool encrypt_metadata;
};
QPDF_DLL
bool isEncrypted() const;
QPDF_DLL
bool isEncrypted(int& R, int& P);
// 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);
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);
// Return the full user password as stored in the PDF file. 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.
QPDF_DLL
std::string getTrimmedUserPassword() const;
// 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 std::cout or the output stream
// specified in a call to setOutputStreams.
QPDF_DLL
bool checkLinearization();
// Calls checkLinearization() and, if possible, prints normalized
// contents of some of the hints tables to std::cout or the output
// stream specified in a call to setOutputStreams. 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();
// 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
QPDF_DLL
void optimize(std::map<int, int> const& object_stream_data,
bool allow_changes = true);
// Replace all references to indirect objects that are "scalars"
// (i.e., things that don't have children: not arrays, streams, or
// dictionaries) with direct objects.
QPDF_DLL
void flattenScalarReferences();
// Decode all streams, discarding the output. Used to check
// correctness of stream encoding.
QPDF_DLL
void decodeStreams();
// For QPDFWriter:
// Remove /ID, /Encrypt, and /Prev keys from the trailer
// dictionary since these are regenerated during write.
QPDF_DLL
void trimTrailerForWrite();
// Get lists of all objects in order according to the part of a
// linearized file that they belong to.
QPDF_DLL
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);
QPDF_DLL
void generateHintStream(std::map<int, QPDFXRefEntry> const& xref,
std::map<int, size_t> const& lengths,
std::map<int, int> const& obj_renumber,
PointerHolder<Buffer>& hint_stream,
int& S, int& O);
// Map object to object stream that contains it
QPDF_DLL
void getObjectStreamData(std::map<int, int>&);
// Get a list of objects that would be permitted in an object
// stream
QPDF_DLL
std::vector<int> getCompressibleObjects();
// Convenience routines for common functions. See also
// QPDFObjectHandle.hh for additional convenience routines.
// Traverse page tree return all /Page objects.
QPDF_DLL
std::vector<QPDFObjectHandle> const& getAllPages();
// Resolver class is restricted to QPDFObjectHandle so that only
// it can resolve indirect references.
class Resolver
{
friend class QPDFObjectHandle;
private:
static PointerHolder<QPDFObject> resolve(
QPDF* qpdf, int objid, int generation)
{
return qpdf->resolve(objid, generation);
}
};
friend class Resolver;
// Pipe class is restricted to QPDF_Stream
class Pipe
{
friend class QPDF_Stream;
private:
static void pipeStreamData(QPDF* qpdf, int objid, int generation,
off_t offset, size_t length,
QPDFObjectHandle dict,
Pipeline* pipeline)
{
qpdf->pipeStreamData(
objid, generation, offset, length, dict, pipeline);
}
};
friend class Pipe;
private:
static std::string qpdf_version;
class InputSource
{
public:
InputSource() :
last_offset(0)
{
}
virtual ~InputSource()
{
}
void setLastOffset(off_t);
off_t getLastOffset() const;
std::string readLine();
virtual std::string const& getName() const = 0;
virtual off_t tell() = 0;
virtual void seek(off_t offset, int whence) = 0;
virtual void rewind() = 0;
virtual size_t read(char* buffer, int length) = 0;
virtual void unreadCh(char ch) = 0;
protected:
off_t last_offset;
};
class FileInputSource: public InputSource
{
public:
FileInputSource();
void setFilename(char const* filename);
virtual ~FileInputSource();
virtual std::string const& getName() const;
virtual off_t tell();
virtual void seek(off_t offset, int whence);
virtual void rewind();
virtual size_t read(char* buffer, int length);
virtual void unreadCh(char ch);
private:
FileInputSource(FileInputSource const&);
FileInputSource& operator=(FileInputSource const&);
void destroy();
std::string filename;
FILE* file;
};
class BufferInputSource: public InputSource
{
public:
BufferInputSource(std::string const& description, Buffer* buf,
bool own_memory = false);
virtual ~BufferInputSource();
virtual std::string const& getName() const;
virtual off_t tell();
virtual void seek(off_t offset, int whence);
virtual void rewind();
virtual size_t read(char* buffer, int length);
virtual void unreadCh(char ch);
private:
bool own_memory;
std::string description;
Buffer* buf;
off_t cur_offset;
};
class ObjGen
{
public:
ObjGen();
ObjGen(int obj, int gen);
bool operator<(ObjGen const&) const;
int obj;
int gen;
};
class ObjCache
{
public:
ObjCache() :
end_before_space(0),
end_after_space(0)
{
}
ObjCache(PointerHolder<QPDFObject> object,
off_t end_before_space,
off_t end_after_space) :
object(object),
end_before_space(end_before_space),
end_after_space(end_after_space)
{
}
PointerHolder<QPDFObject> object;
off_t end_before_space;
off_t end_after_space;
};
void parse(char const* password);
void warn(QPDFExc const& e);
void setTrailer(QPDFObjectHandle obj);
void read_xref(off_t offset);
void reconstruct_xref(QPDFExc& e);
int read_xrefTable(off_t offset);
int read_xrefStream(off_t offset);
int processXRefStream(off_t offset, QPDFObjectHandle& xref_stream);
void insertXrefEntry(int obj, int f0, int f1, int f2,
bool overwrite = false);
void setLastObjectDescription(std::string const& description,
int objid, int generation);
QPDFObjectHandle readObject(
PointerHolder<InputSource>, std::string const& description,
int objid, int generation, bool in_object_stream);
QPDFObjectHandle readObjectInternal(
PointerHolder<InputSource> input, int objid, int generation,
bool in_object_stream,
bool in_array, bool in_dictionary);
int recoverStreamLength(
PointerHolder<InputSource> input, int objid, int generation,
off_t stream_offset);
QPDFTokenizer::Token readToken(PointerHolder<InputSource>);
QPDFObjectHandle readObjectAtOffset(
bool attempt_recovery,
off_t offset, std::string const& description,
int exp_objid, int exp_generation,
int& act_objid, int& act_generation);
PointerHolder<QPDFObject> resolve(int objid, int generation);
void resolveObjectsInStream(int obj_stream_number);
// Calls finish() on the pipeline when done but does not delete it
void pipeStreamData(int objid, int generation,
off_t offset, size_t length,
QPDFObjectHandle dict,
Pipeline* pipeline);
void getAllPagesInternal(QPDFObjectHandle cur_pages,
std::vector<QPDFObjectHandle>& result);
// methods to support encryption -- implemented in QPDF_encryption.cc
encryption_method_e interpretCF(QPDFObjectHandle);
void initializeEncryption();
std::string getKeyForObject(int objid, int generation, bool use_aes);
void decryptString(std::string&, int objid, int generation);
void decryptStream(
Pipeline*& pipeline, int objid, int generation,
QPDFObjectHandle& stream_dict,
std::vector<PointerHolder<Pipeline> >& heap);
// 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
{
HPageOffsetEntry() :
delta_nobjects(0),
delta_page_length(0),
nshared_objects(0),
delta_content_offset(0),
delta_content_length(0)
{
}
int delta_nobjects; // 1
int delta_page_length; // 2
int nshared_objects; // 3
// vectors' sizes = nshared_objects
std::vector<int> shared_identifiers; // 4
std::vector<int> shared_numerators; // 5
int delta_content_offset; // 6
int delta_content_length; // 7
};
// PDF 1.4: Table F.3
struct HPageOffset
{
HPageOffset() :
min_nobjects(0),
first_page_offset(0),
nbits_delta_nobjects(0),
min_page_length(0),
nbits_delta_page_length(0),
min_content_offset(0),
nbits_delta_content_offset(0),
min_content_length(0),
nbits_delta_content_length(0),
nbits_nshared_objects(0),
nbits_shared_identifier(0),
nbits_shared_numerator(0),
shared_denominator(0)
{
}
int min_nobjects; // 1
int first_page_offset; // 2
int nbits_delta_nobjects; // 3
int min_page_length; // 4
int nbits_delta_page_length; // 5
int min_content_offset; // 6
int nbits_delta_content_offset; // 7
int min_content_length; // 8
int nbits_delta_content_length; // 9
int nbits_nshared_objects; // 10
int nbits_shared_identifier; // 11
int nbits_shared_numerator; // 12
int shared_denominator; // 13
// vector size is npages
std::vector<HPageOffsetEntry> entries;
};
// PDF 1.4: Table F.6
struct HSharedObjectEntry
{
HSharedObjectEntry() :
delta_group_length(0),
signature_present(0),
nobjects_minus_one(0)
{
}
// Item 3 is a 128-bit signature (unsupported by Acrobat)
int delta_group_length; // 1
int signature_present; // 2 -- always 0
int nobjects_minus_one; // 4 -- always 0
};
// PDF 1.4: Table F.5
struct HSharedObject
{
HSharedObject() :
first_shared_obj(0),
first_shared_offset(0),
nshared_first_page(0),
nshared_total(0),
nbits_nobjects(0),
min_group_length(0),
nbits_delta_group_length(0)
{
}
int first_shared_obj; // 1
int first_shared_offset; // 2
int nshared_first_page; // 3
int nshared_total; // 4
int nbits_nobjects; // 5
int min_group_length; // 6
int nbits_delta_group_length; // 7
// vector size is nshared_total
std::vector<HSharedObjectEntry> entries;
};
// PDF 1.4: Table F.9
struct HGeneric
{
HGeneric() :
first_object(0),
first_object_offset(0),
nobjects(0),
group_length(0)
{
}
int first_object; // 1
int first_object_offset; // 2
int nobjects; // 3
int group_length; // 4
};
// Other linearization data structures
// Initialized from Linearization Parameter dictionary
struct LinParameters
{
LinParameters() :
file_size(0),
first_page_object(0),
first_page_end(0),
npages(0),
xref_zero_offset(0),
first_page(0),
H_offset(0),
H_length(0)
{
}
int file_size; // /L
int first_page_object; // /O
int first_page_end; // /E
int npages; // /N
int xref_zero_offset; // /T
int first_page; // /P
int H_offset; // offset of primary hint stream
int H_length; // 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
{
CHPageOffsetEntry() :
nobjects(0),
nshared_objects(0)
{
}
int nobjects;
int nshared_objects;
// 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
{
CHSharedObject() :
first_shared_obj(0),
nshared_first_page(0),
nshared_total(0)
{
}
int first_shared_obj;
int nshared_first_page;
int nshared_total;
// 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
};
// methods to support linearization checking -- implemented in
// QPDF_linearization.cc
void readLinearizationData();
bool checkLinearizationInternal();
void dumpLinearizationDataInternal();
QPDFObjectHandle readHintStream(Pipeline&, off_t offset, size_t length);
void readHPageOffset(BitStream);
void readHSharedObject(BitStream);
void readHGeneric(BitStream, HGeneric&);
int maxEnd(ObjUser const& ou);
int getLinearizationOffset(ObjGen const&);
QPDFObjectHandle getUncompressedObject(
QPDFObjectHandle&, std::map<int, int> const& object_stream_data);
int lengthNextN(int first_object, int n,
std::list<std::string>& errors);
void checkHPageOffset(std::list<std::string>& errors,
std::list<std::string>& warnings,
std::vector<QPDFObjectHandle> const& pages,
std::map<int, int>& idx_to_obj);
void checkHSharedObject(std::list<std::string>& warnings,
std::list<std::string>& errors,
std::vector<QPDFObjectHandle> const& pages,
std::map<int, int>& idx_to_obj);
void checkHOutlines(std::list<std::string>& warnings);
void dumpHPageOffset();
void dumpHSharedObject();
void dumpHGeneric(HGeneric&);
int adjusted_offset(int offset);
QPDFObjectHandle objGenToIndirect(ObjGen const&);
void calculateLinearizationData(
std::map<int, int> const& object_stream_data);
void pushOutlinesToPart(
std::vector<QPDFObjectHandle>& part,
std::set<ObjGen>& lc_outlines,
std::map<int, int> const& object_stream_data);
int outputLengthNextN(
int in_object, int n,
std::map<int, size_t> const& lengths,
std::map<int, int> const& obj_renumber);
void calculateHPageOffset(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, size_t> const& lengths,
std::map<int, int> const& obj_renumber);
void calculateHSharedObject(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, size_t> const& lengths,
std::map<int, int> const& obj_renumber);
void calculateHOutline(
std::map<int, QPDFXRefEntry> const& xref,
std::map<int, size_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 optimizePagesTree(
QPDFObjectHandle,
std::map<std::string, std::vector<QPDFObjectHandle> >&,
int& pageno, bool allow_changes);
void updateObjectMaps(ObjUser const& ou, QPDFObjectHandle oh);
void updateObjectMapsInternal(ObjUser const& ou, QPDFObjectHandle oh,
std::set<ObjGen>& visited, bool top);
void filterCompressedObjects(std::map<int, int> const& object_stream_data);
QPDFTokenizer tokenizer;
PointerHolder<InputSource> file;
std::string last_object_description;
bool encrypted;
bool encryption_initialized;
bool ignore_xref_streams;
bool suppress_warnings;
std::ostream* out_stream;
std::ostream* err_stream;
bool attempt_recovery;
int encryption_V;
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;
int cached_key_objid;
int cached_key_generation;
std::string pdf_version;
std::map<ObjGen, QPDFXRefEntry> xref_table;
std::set<int> deleted_objects;
std::map<ObjGen, ObjCache> obj_cache;
QPDFObjectHandle trailer;
std::vector<QPDFObjectHandle> all_pages;
std::vector<QPDFExc> warnings;
// Linearization data
int first_xref_item_offset; // actual value from file
bool uncompressed_after_compressed;
// 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<ObjGen> > obj_user_to_objects;
std::map<ObjGen, std::set<ObjUser> > object_to_obj_users;
};
#endif // __QPDF_HH__
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