mirror of
https://github.com/qpdf/qpdf.git
synced 2024-06-02 02:10:52 +00:00
e4e2e26d99
Remove calls to assertPageObject(). All cases in the library that called assertPageObject() work fine if you don't call assertPageObject() because nothing assumes anything that was being checked by that call. Removing the calls enables more files to be successfully processed.
917 lines
33 KiB
C++
917 lines
33 KiB
C++
// Copyright (c) 2005-2018 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef __QPDFOBJECTHANDLE_HH__
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#define __QPDFOBJECTHANDLE_HH__
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#include <qpdf/DLL.h>
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#include <qpdf/Types.h>
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#include <qpdf/Constants.h>
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#include <string>
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#include <vector>
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#include <set>
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#include <map>
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#include <qpdf/QPDFObjGen.hh>
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#include <qpdf/PointerHolder.hh>
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#include <qpdf/Buffer.hh>
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#include <qpdf/InputSource.hh>
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#include <qpdf/QPDFTokenizer.hh>
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#include <qpdf/QPDFObject.hh>
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class Pipeline;
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class QPDF;
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class QPDF_Dictionary;
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class QPDF_Array;
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class QPDFTokenizer;
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class QPDFExc;
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class Pl_QPDFTokenizer;
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class QPDFObjectHandle
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{
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public:
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// This class is used by replaceStreamData. It provides an
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// alternative way of associating stream data with a stream. See
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// comments on replaceStreamData and newStream for additional
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// details.
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class StreamDataProvider
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{
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public:
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QPDF_DLL
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virtual ~StreamDataProvider()
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{
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}
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// The implementation of this function must write stream data
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// to the given pipeline. The stream data must conform to
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// whatever filters are explicitly associated with the stream.
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// QPDFWriter may, in some cases, add compression, but if it
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// does, it will update the filters as needed. Every call to
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// provideStreamData for a given stream must write the same
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// data. The object ID and generation passed to this method
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// are those that belong to the stream on behalf of which the
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// provider is called. They may be ignored or used by the
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// implementation for indexing or other purposes. This
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// information is made available just to make it more
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// convenient to use a single StreamDataProvider object to
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// provide data for multiple streams.
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virtual void provideStreamData(int objid, int generation,
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Pipeline* pipeline) = 0;
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};
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// The TokenFilter class provides a way to filter content streams
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// in a lexically aware fashion. TokenFilters can be attached to
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// streams using the addTokenFilter or addContentTokenFilter
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// methods or can be applied on the spot by filterPageContents.
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// You may also use Pl_QPDFTokenizer directly if you need full
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// control.
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//
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// The handleToken method is called for each token, including the
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// eof token, and then handleEOF is called at the very end.
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// Handlers may call write (or writeToken) to pass data
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// downstream. Please see examples/pdf-filter-tokens.cc and
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// examples/pdf-count-strings.cc for examples of using
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// TokenFilters.
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//
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// Please note that when you call token.getValue() on a token of
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// type tt_string, you get the string value without any
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// delimiters. token.getRawValue() will return something suitable
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// for being written to output, or calling writeToken with a
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// string token will also work. The correct way to construct a
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// string token that would write the literal value (str) is
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// QPDFTokenizer::Token(QPDFTokenizer::tt_string, "str").
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class TokenFilter
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{
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public:
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QPDF_DLL
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TokenFilter()
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{
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}
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QPDF_DLL
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virtual ~TokenFilter()
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{
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}
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virtual void handleToken(QPDFTokenizer::Token const&) = 0;
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QPDF_DLL
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virtual void handleEOF();
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class PipelineAccessor
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{
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friend class Pl_QPDFTokenizer;
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private:
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static void setPipeline(TokenFilter* f, Pipeline* p)
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{
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f->setPipeline(p);
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}
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};
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protected:
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QPDF_DLL
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void write(char const* data, size_t len);
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QPDF_DLL
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void write(std::string const& str);
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QPDF_DLL
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void writeToken(QPDFTokenizer::Token const&);
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private:
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void setPipeline(Pipeline*);
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Pipeline* pipeline;
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};
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// This class is used by parse to decrypt strings when reading an
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// object that contains encrypted strings.
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class StringDecrypter
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{
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public:
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QPDF_DLL
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virtual ~StringDecrypter()
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{
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}
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virtual void decryptString(std::string& val) = 0;
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};
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// This class is used by parsePageContents. Callers must
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// instantiate a subclass of this with handlers defined to accept
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// QPDFObjectHandles that are parsed from the stream.
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class ParserCallbacks
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{
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public:
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QPDF_DLL
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virtual ~ParserCallbacks()
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{
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}
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virtual void handleObject(QPDFObjectHandle) = 0;
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virtual void handleEOF() = 0;
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protected:
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// Implementors may call this method during parsing to
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// terminate parsing early. This method throws an exception
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// that is caught by parsePageContents, so its effect is
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// immediate.
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QPDF_DLL
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void terminateParsing();
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};
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QPDF_DLL
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QPDFObjectHandle();
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QPDF_DLL
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QPDFObjectHandle(QPDFObjectHandle const&);
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QPDF_DLL
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QPDFObjectHandle&
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operator=(QPDFObjectHandle const&);
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QPDF_DLL
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bool isInitialized() const;
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// Return type code and type name of underlying object. These are
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// useful for doing rapid type tests (like switch statements) or
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// for testing and debugging.
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QPDF_DLL
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QPDFObject::object_type_e getTypeCode();
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QPDF_DLL
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char const* getTypeName();
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// Exactly one of these will return true for any object. Operator
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// and InlineImage are only allowed in content streams.
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QPDF_DLL
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bool isBool();
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QPDF_DLL
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bool isNull();
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QPDF_DLL
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bool isInteger();
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QPDF_DLL
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bool isReal();
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QPDF_DLL
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bool isName();
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QPDF_DLL
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bool isString();
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QPDF_DLL
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bool isOperator();
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QPDF_DLL
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bool isInlineImage();
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QPDF_DLL
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bool isArray();
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QPDF_DLL
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bool isDictionary();
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QPDF_DLL
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bool isStream();
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QPDF_DLL
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bool isReserved();
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// This returns true in addition to the query for the specific
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// type for indirect objects.
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QPDF_DLL
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bool isIndirect();
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// True for everything except array, dictionary, stream, word, and
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// inline image.
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QPDF_DLL
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bool isScalar();
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// Public factory methods
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// Construct an object of any type from a string representation of
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// the object. Throws QPDFExc with an empty filename and an
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// offset into the string if there is an error. Any indirect
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// object syntax (obj gen R) will cause a logic_error exception to
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// be thrown. If object_description is provided, it will appear
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// in the message of any QPDFExc exception thrown for invalid
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// syntax.
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QPDF_DLL
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static QPDFObjectHandle parse(std::string const& object_str,
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std::string const& object_description = "");
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// Construct an object as above by reading from the given
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// InputSource at its current position and using the tokenizer you
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// supply. Indirect objects and encrypted strings are permitted.
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// This method is intended to be called by QPDF for parsing
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// objects that are ready from the object's input stream.
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QPDF_DLL
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static QPDFObjectHandle parse(PointerHolder<InputSource> input,
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std::string const& object_description,
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QPDFTokenizer&, bool& empty,
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StringDecrypter* decrypter,
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QPDF* context);
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// Helpers for parsing content streams
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// Parse a page's contents through ParserCallbacks, described
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// above. This method works whether the contents are a single
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// stream or an array of streams. Call on a page object.
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QPDF_DLL
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void parsePageContents(ParserCallbacks* callbacks);
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// Pass a page's contents through the given TokenFilter. If a
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// pipeline is also provided, it will be the target of the write
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// methods from the token filter. If a pipeline is not specified,
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// any output generated by the token filter will be discarded. Use
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// this interface if you need to pass a page's contents through
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// filter for work purposes without having that filter
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// automatically applied to the page's contents, as happens with
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// addContentTokenFilter. See examples/pdf-count-strings.cc for an
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// example.
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QPDF_DLL
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void filterPageContents(TokenFilter* filter, Pipeline* next = 0);
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// Pipe a page's contents through the given pipeline. This method
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// works whether the contents are a single stream or an array of
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// streams. Call on a page object.
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QPDF_DLL
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void pipePageContents(Pipeline* p);
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// When called on a stream or stream array that is some page's
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// content streams, do the same as pipePageContents. This method
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// is a lower level way to do what pipePageContents does, but it
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// allows you to perform this operation on a contents object that
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// is disconnected from a page object. The description argument
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// should describe the containing page and is used in error
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// messages. The all_description argument is initialized to
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// something that could be used to describe the result of the
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// pipeline. It is the description amended with the identifiers of
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// the underlying objects.
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QPDF_DLL
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void pipeContentStreams(Pipeline* p, std::string const& description,
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std::string& all_description);
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// Older method: stream_or_array should be the value of /Contents
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// from a page object. It's more convenient to just call
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// parsePageContents on the page object, and error messages will
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// also be more useful because the page object information will be
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// known.
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QPDF_DLL
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static void parseContentStream(QPDFObjectHandle stream_or_array,
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ParserCallbacks* callbacks);
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// Attach a token filter to a page's contents. If the page's
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// contents is an array of streams, it is automatically coalesced.
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// The token filter is applied to the page's contents as a single
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// stream.
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QPDF_DLL
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void addContentTokenFilter(PointerHolder<TokenFilter> token_filter);
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// As of qpdf 8, it is possible to add custom token filters to a
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// stream. The tokenized stream data is passed through the token
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// filter after all original filters but before content stream
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// normalization if requested. This is a low-level interface to
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// add it to a stream. You will usually want to call
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// addContentTokenFilter instead, which can be applied to a page
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// object, and which will automatically handle the case of pages
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// whose contents are split across multiple streams.
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void addTokenFilter(PointerHolder<TokenFilter> token_filter);
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// Type-specific factories
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QPDF_DLL
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static QPDFObjectHandle newNull();
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QPDF_DLL
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static QPDFObjectHandle newBool(bool value);
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QPDF_DLL
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static QPDFObjectHandle newInteger(long long value);
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QPDF_DLL
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static QPDFObjectHandle newReal(std::string const& value);
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QPDF_DLL
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static QPDFObjectHandle newReal(double value, int decimal_places = 0);
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QPDF_DLL
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static QPDFObjectHandle newName(std::string const& name);
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QPDF_DLL
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static QPDFObjectHandle newString(std::string const& str);
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QPDF_DLL
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static QPDFObjectHandle newOperator(std::string const&);
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QPDF_DLL
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static QPDFObjectHandle newInlineImage(std::string const&);
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QPDF_DLL
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static QPDFObjectHandle newArray();
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QPDF_DLL
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static QPDFObjectHandle newArray(
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std::vector<QPDFObjectHandle> const& items);
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QPDF_DLL
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static QPDFObjectHandle newDictionary();
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QPDF_DLL
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static QPDFObjectHandle newDictionary(
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std::map<std::string, QPDFObjectHandle> const& items);
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// Create a new stream and associate it with the given qpdf
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// object. A subsequent call must be made to replaceStreamData()
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// to provide data for the stream. The stream's dictionary may be
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// retrieved by calling getDict(), and the resulting dictionary
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// may be modified. Alternatively, you can create a new
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// dictionary and call replaceDict to install it.
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QPDF_DLL
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static QPDFObjectHandle newStream(QPDF* qpdf);
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// Create a new stream and associate it with the given qpdf
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// object. Use the given buffer as the stream data. The stream
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// dictionary's /Length key will automatically be set to the size
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// of the data buffer. If additional keys are required, the
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// stream's dictionary may be retrieved by calling getDict(), and
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// the resulting dictionary may be modified. This method is just
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// a convenient wrapper around the newStream() and
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// replaceStreamData(). It is a convenience methods for streams
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// that require no parameters beyond the stream length. Note that
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// you don't have to deal with compression yourself if you use
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// QPDFWriter. By default, QPDFWriter will automatically compress
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// uncompressed stream data. Example programs are provided that
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// illustrate this.
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QPDF_DLL
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static QPDFObjectHandle newStream(QPDF* qpdf, PointerHolder<Buffer> data);
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// Create new stream with data from string. This method will
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// create a copy of the data rather than using the user-provided
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// buffer as in the PointerHolder<Buffer> version of newStream.
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QPDF_DLL
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static QPDFObjectHandle newStream(QPDF* qpdf, std::string const& data);
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// A reserved object is a special sentinel used for qpdf to
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// reserve a spot for an object that is going to be added to the
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// QPDF object. Normally you don't have to use this type since
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// you can just call QPDF::makeIndirectObject. However, in some
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// cases, if you have to create objects with circular references,
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// you may need to create a reserved object so that you can have a
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// reference to it and then replace the object later. Reserved
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// objects have the special property that they can't be resolved
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// to direct objects. This makes it possible to replace a
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// reserved object with a new object while preserving existing
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// references to them. When you are ready to replace a reserved
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// object with its replacement, use QPDF::replaceReserved for this
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// purpose rather than the more general QPDF::replaceObject. It
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// is an error to try to write a QPDF with QPDFWriter if it has
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// any reserved objects in it.
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QPDF_DLL
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static QPDFObjectHandle newReserved(QPDF* qpdf);
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// Provide an owning qpdf and object description. The library does
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// this automatically with objects that are read from from the
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// input PDF and with objects that are created programmatically
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// and inserted into the QPDF by adding them to an array or a
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// dictionary or creating a new indirect object. Most end user
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// code will not need to call this. If an object has an owning
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// qpdf and object description, it enables qpdf to give warnings
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// with proper context in some cases where it would otherwise
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// raise exceptions.
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QPDF_DLL
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void setObjectDescription(QPDF* owning_qpdf,
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std::string const& object_description);
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QPDF_DLL
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bool hasObjectDescription();
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// Accessor methods. If an accessor method that is valid for only
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// a particular object type is called on an object of the wrong
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// type, an exception is thrown.
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// Methods for bool objects
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QPDF_DLL
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bool getBoolValue();
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// Methods for integer objects
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QPDF_DLL
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long long getIntValue();
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// Methods for real objects
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QPDF_DLL
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std::string getRealValue();
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// Methods that work for both integer and real objects
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QPDF_DLL
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bool isNumber();
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QPDF_DLL
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double getNumericValue();
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// Methods for name objects; see also name and array objects
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QPDF_DLL
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std::string getName();
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// Methods for string objects
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QPDF_DLL
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std::string getStringValue();
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// If a string starts with the UTF-16 marker, it is converted from
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// UTF-16 to UTF-8. Otherwise, it is treated as a string encoded
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// with PDF Doc Encoding. PDF Doc Encoding is identical to
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// ISO-8859-1 except in the range from 0200 through 0240, where
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// there is a mapping of characters to Unicode. QPDF versions
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// prior to version erroneously left characters in that range
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// unmapped.
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QPDF_DLL
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std::string getUTF8Value();
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// Methods for content stream objects
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QPDF_DLL
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std::string getOperatorValue();
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QPDF_DLL
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std::string getInlineImageValue();
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// Methods for array objects; see also name and array objects
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QPDF_DLL
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int getArrayNItems();
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QPDF_DLL
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QPDFObjectHandle getArrayItem(int n);
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QPDF_DLL
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std::vector<QPDFObjectHandle> getArrayAsVector();
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// Methods for dictionary objects
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QPDF_DLL
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bool hasKey(std::string const&);
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QPDF_DLL
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QPDFObjectHandle getKey(std::string const&);
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QPDF_DLL
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std::set<std::string> getKeys();
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QPDF_DLL
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std::map<std::string, QPDFObjectHandle> getDictAsMap();
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// Methods for name and array objects
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QPDF_DLL
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bool isOrHasName(std::string const&);
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// Return the QPDF object that owns an indirect object. Returns
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// null for a direct object.
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QPDF_DLL
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QPDF* getOwningQPDF();
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// Create a shallow copy of an object as a direct object. Since
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// this is a shallow copy, for dictionaries and arrays, any keys
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// or items that were indirect objects will still be indirect
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// objects that point to the same place.
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QPDF_DLL
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QPDFObjectHandle shallowCopy();
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// Mutator methods. Use with caution.
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// Recursively copy this object, making it direct. Throws an
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// exception if a loop is detected or any sub-object is a stream.
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QPDF_DLL
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void makeDirect();
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// Mutator methods for array objects
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QPDF_DLL
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void setArrayItem(int, QPDFObjectHandle const&);
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QPDF_DLL
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void setArrayFromVector(std::vector<QPDFObjectHandle> const& items);
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// Insert an item before the item at the given position ("at") so
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// that it has that position after insertion. If "at" is equal to
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// the size of the array, insert the item at the end.
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QPDF_DLL
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void insertItem(int at, QPDFObjectHandle const& item);
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QPDF_DLL
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void appendItem(QPDFObjectHandle const& item);
|
|
// Remove the item at that position, reducing the size of the
|
|
// array by one.
|
|
QPDF_DLL
|
|
void eraseItem(int at);
|
|
|
|
// Mutator methods for dictionary objects
|
|
|
|
// Replace value of key, adding it if it does not exist
|
|
QPDF_DLL
|
|
void replaceKey(std::string const& key, QPDFObjectHandle);
|
|
// Remove key, doing nothing if key does not exist
|
|
QPDF_DLL
|
|
void removeKey(std::string const& key);
|
|
// If the object is null, remove the key. Otherwise, replace it.
|
|
QPDF_DLL
|
|
void replaceOrRemoveKey(std::string const& key, QPDFObjectHandle);
|
|
|
|
// Methods for stream objects
|
|
QPDF_DLL
|
|
QPDFObjectHandle getDict();
|
|
|
|
// If addTokenFilter has been called for this stream, then the
|
|
// original data should be considered to be modified. This means we
|
|
// should avoid optimizations such as not filtering a stream that
|
|
// is already compressed.
|
|
QPDF_DLL
|
|
bool isDataModified();
|
|
|
|
// Returns filtered (uncompressed) stream data. Throws an
|
|
// exception if the stream is filtered and we can't decode it.
|
|
QPDF_DLL
|
|
PointerHolder<Buffer> getStreamData(
|
|
qpdf_stream_decode_level_e level = qpdf_dl_generalized);
|
|
|
|
// Returns unfiltered (raw) stream data.
|
|
QPDF_DLL
|
|
PointerHolder<Buffer> getRawStreamData();
|
|
|
|
// Write stream data through the given pipeline. A null pipeline
|
|
// value may be used if all you want to do is determine whether a
|
|
// stream is filterable and would be filtered based on the
|
|
// provided flags. If flags is 0, write raw stream data and return
|
|
// false. Otherwise, the flags alter the behavior in the following
|
|
// way:
|
|
//
|
|
// encode_flags:
|
|
//
|
|
// qpdf_sf_compress -- compress data with /FlateDecode if no other
|
|
// compression filters are applied.
|
|
//
|
|
// qpdf_sf_normalize -- tokenize as content stream and normalize tokens
|
|
//
|
|
// decode_level:
|
|
//
|
|
// qpdf_dl_none -- do not decode any streams.
|
|
//
|
|
// qpdf_dl_generalized -- decode supported general-purpose
|
|
// filters. This includes /ASCIIHexDecode, /ASCII85Decode,
|
|
// /LZWDecode, and /FlateDecode.
|
|
//
|
|
// qpdf_dl_specialized -- in addition to generalized filters, also
|
|
// decode supported non-lossy specialized filters. This includes
|
|
// /RunLengthDecode.
|
|
//
|
|
// qpdf_dl_all -- in addition to generalized and non-lossy
|
|
// specialized filters, decode supported lossy filters. This
|
|
// includes /DCTDecode.
|
|
//
|
|
// If, based on the flags and the filters and decode parameters,
|
|
// we determine that we know how to apply all requested filters,
|
|
// do so and return true if we are successful.
|
|
//
|
|
// In all cases, a return value of true means that filtered data
|
|
// has been written successfully. If filtering is requested but
|
|
// this method returns false, it means there was some error in the
|
|
// filtering, in which case the resulting data is likely partially
|
|
// filtered and/or incomplete and may not be consistent with the
|
|
// configured filters. QPDFWriter handles this by attempting to
|
|
// get the stream data without filtering, but callers should
|
|
// consider a false return value when decode_level is not
|
|
// qpdf_dl_none to be a potential loss of data. If you intend to
|
|
// retry in that case, pass true as the value of will_retry. This
|
|
// changes the warning issued by the library to indicate that the
|
|
// operation will be retried without filtering to avoid data loss.
|
|
QPDF_DLL
|
|
bool pipeStreamData(Pipeline*,
|
|
unsigned long encode_flags,
|
|
qpdf_stream_decode_level_e decode_level,
|
|
bool suppress_warnings = false,
|
|
bool will_retry = false);
|
|
|
|
// Legacy pipeStreamData. This maps to the the flags-based
|
|
// pipeStreamData as follows:
|
|
// filter = false -> encode_flags = 0
|
|
// filter = true -> decode_level = qpdf_dl_generalized
|
|
// normalize = true -> encode_flags |= qpdf_sf_normalize
|
|
// compress = true -> encode_flags |= qpdf_sf_compress
|
|
QPDF_DLL
|
|
bool pipeStreamData(Pipeline*, bool filter,
|
|
bool normalize, bool compress);
|
|
|
|
// Replace a stream's dictionary. The new dictionary must be
|
|
// consistent with the stream's data. This is most appropriately
|
|
// used when creating streams from scratch that will use a stream
|
|
// data provider and therefore start with an empty dictionary. It
|
|
// may be more convenient in this case than calling getDict and
|
|
// modifying it for each key. The pdf-create example does this.
|
|
QPDF_DLL
|
|
void replaceDict(QPDFObjectHandle);
|
|
|
|
// Replace this stream's stream data with the given data buffer,
|
|
// and replace the /Filter and /DecodeParms keys in the stream
|
|
// dictionary with the given values. (If either value is empty,
|
|
// the corresponding key is removed.) The stream's /Length key is
|
|
// replaced with the length of the data buffer. The stream is
|
|
// interpreted as if the data read from the file, after any
|
|
// decryption filters have been applied, is as presented.
|
|
QPDF_DLL
|
|
void replaceStreamData(PointerHolder<Buffer> data,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms);
|
|
|
|
// Replace the stream's stream data with the given string.
|
|
// This method will create a copy of the data rather than using
|
|
// the user-provided buffer as in the PointerHolder<Buffer> version
|
|
// of replaceStreamData.
|
|
QPDF_DLL
|
|
void replaceStreamData(std::string const& data,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms);
|
|
|
|
// As above, replace this stream's stream data. Instead of
|
|
// directly providing a buffer with the stream data, call the
|
|
// given provider's provideStreamData method. See comments on the
|
|
// StreamDataProvider class (defined above) for details on the
|
|
// method. The data must be consistent with filter and
|
|
// decode_parms as provided. Although it is more complex to use
|
|
// this form of replaceStreamData than the one that takes a
|
|
// buffer, it makes it possible to avoid allocating memory for the
|
|
// stream data. Example programs are provided that use both forms
|
|
// of replaceStreamData.
|
|
|
|
// Note about stream length: for any given stream, the provider
|
|
// must provide the same amount of data each time it is called.
|
|
// This is critical for making linearization work properly.
|
|
// Versions of qpdf before 3.0.0 required a length to be specified
|
|
// here. Starting with version 3.0.0, this is no longer necessary
|
|
// (or permitted). The first time the stream data provider is
|
|
// invoked for a given stream, the actual length is stored.
|
|
// Subsequent times, it is enforced that the length be the same as
|
|
// the first time.
|
|
|
|
// If you have gotten a compile error here while building code
|
|
// that worked with older versions of qpdf, just omit the length
|
|
// parameter. You can also simplify your code by not having to
|
|
// compute the length in advance.
|
|
QPDF_DLL
|
|
void replaceStreamData(PointerHolder<StreamDataProvider> provider,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms);
|
|
|
|
// Access object ID and generation. For direct objects, return
|
|
// object ID 0.
|
|
|
|
// NOTE: Be careful about calling getObjectID() and
|
|
// getGeneration() directly as this can lead to the pattern of
|
|
// depending on object ID or generation without the other. In
|
|
// general, when keeping track of object IDs, it's better to use
|
|
// QPDFObjGen instead.
|
|
|
|
QPDF_DLL
|
|
QPDFObjGen getObjGen() const;
|
|
QPDF_DLL
|
|
int getObjectID() const;
|
|
QPDF_DLL
|
|
int getGeneration() const;
|
|
|
|
QPDF_DLL
|
|
std::string unparse();
|
|
QPDF_DLL
|
|
std::string unparseResolved();
|
|
|
|
// Convenience routines for commonly performed functions
|
|
|
|
// Returns an empty map if there are no images or no resources.
|
|
// This function does not presently support inherited resources.
|
|
// If this is a significant concern, call
|
|
// pushInheritedAttributesToPage() on the QPDF object that owns
|
|
// this page. See comment in the source for details. Return value
|
|
// is a map from XObject name to the image object, which is always
|
|
// a stream.
|
|
QPDF_DLL
|
|
std::map<std::string, QPDFObjectHandle> getPageImages();
|
|
|
|
// Returns a vector of stream objects representing the content
|
|
// streams for the given page. This routine allows the caller to
|
|
// not care whether there are one or more than one content streams
|
|
// for a page.
|
|
QPDF_DLL
|
|
std::vector<QPDFObjectHandle> getPageContents();
|
|
|
|
// Add the given object as a new content stream for this page. If
|
|
// parameter 'first' is true, add to the beginning. Otherwise, add
|
|
// to the end. This routine automatically converts the page
|
|
// contents to an array if it is a scalar, allowing the caller not
|
|
// to care what the initial structure is. You can call
|
|
// coalesceContentStreams() afterwards if you want to force it to
|
|
// be a single stream.
|
|
QPDF_DLL
|
|
void addPageContents(QPDFObjectHandle contents, bool first);
|
|
|
|
// Rotate a page. If relative is false, set the rotation of the
|
|
// page to angle. Otherwise, add angle to the rotation of the
|
|
// page. Angle must be a multiple of 90. Adding 90 to the rotation
|
|
// rotates clockwise by 90 degrees.
|
|
QPDF_DLL
|
|
void rotatePage(int angle, bool relative);
|
|
|
|
// Coalesce a page's content streams. A page's content may be a
|
|
// stream or an array of streams. If this page's content is an
|
|
// array, concatenate the streams into a single stream. This can
|
|
// be useful when working with files that split content streams in
|
|
// arbitrary spots, such as in the middle of a token, as that can
|
|
// confuse some software. You could also call this after calling
|
|
// addPageContents.
|
|
QPDF_DLL
|
|
void coalesceContentStreams();
|
|
|
|
// Initializers for objects. This Factory class gives the QPDF
|
|
// class specific permission to call factory methods without
|
|
// making it a friend of the whole QPDFObjectHandle class.
|
|
class Factory
|
|
{
|
|
friend class QPDF;
|
|
private:
|
|
static QPDFObjectHandle newIndirect(QPDF* qpdf,
|
|
int objid, int generation)
|
|
{
|
|
return QPDFObjectHandle::newIndirect(qpdf, objid, generation);
|
|
}
|
|
// object must be dictionary object
|
|
static QPDFObjectHandle newStream(
|
|
QPDF* qpdf, int objid, int generation,
|
|
QPDFObjectHandle stream_dict, qpdf_offset_t offset, size_t length)
|
|
{
|
|
return QPDFObjectHandle::newStream(
|
|
qpdf, objid, generation, stream_dict, offset, length);
|
|
}
|
|
};
|
|
friend class Factory;
|
|
|
|
// Accessor for raw underlying object -- only QPDF is allowed to
|
|
// call this.
|
|
class ObjAccessor
|
|
{
|
|
friend class QPDF;
|
|
private:
|
|
static PointerHolder<QPDFObject> getObject(QPDFObjectHandle& o)
|
|
{
|
|
o.dereference();
|
|
return o.m->obj;
|
|
}
|
|
};
|
|
friend class ObjAccessor;
|
|
|
|
// Provide access to specific classes for recursive
|
|
// releaseResolved().
|
|
class ReleaseResolver
|
|
{
|
|
friend class QPDF_Dictionary;
|
|
friend class QPDF_Array;
|
|
friend class QPDF_Stream;
|
|
private:
|
|
static void releaseResolved(QPDFObjectHandle& o)
|
|
{
|
|
o.releaseResolved();
|
|
}
|
|
};
|
|
friend class ReleaseResolver;
|
|
|
|
// Convenience routine: Throws if the assumption is violated. Your
|
|
// code will be better if you call one of the isType methods and
|
|
// handle the case of the type being wrong, but these can be
|
|
// convenient if you have already verified the type.
|
|
QPDF_DLL
|
|
void assertInitialized() const;
|
|
|
|
QPDF_DLL
|
|
void assertNull();
|
|
QPDF_DLL
|
|
void assertBool();
|
|
QPDF_DLL
|
|
void assertInteger();
|
|
QPDF_DLL
|
|
void assertReal();
|
|
QPDF_DLL
|
|
void assertName();
|
|
QPDF_DLL
|
|
void assertString();
|
|
QPDF_DLL
|
|
void assertOperator();
|
|
QPDF_DLL
|
|
void assertInlineImage();
|
|
QPDF_DLL
|
|
void assertArray();
|
|
QPDF_DLL
|
|
void assertDictionary();
|
|
QPDF_DLL
|
|
void assertStream();
|
|
QPDF_DLL
|
|
void assertReserved();
|
|
|
|
QPDF_DLL
|
|
void assertIndirect();
|
|
QPDF_DLL
|
|
void assertScalar();
|
|
QPDF_DLL
|
|
void assertNumber();
|
|
|
|
// The isPageObject method checks the /Type key of the object.
|
|
// This is not completely reliable as there are some otherwise
|
|
// valid files whose /Type is wrong for page objects. qpdf is
|
|
// slightly more accepting but may still return false here when
|
|
// treating the object as a page would work. Use this sparingly.
|
|
QPDF_DLL
|
|
bool isPageObject();
|
|
QPDF_DLL
|
|
bool isPagesObject();
|
|
QPDF_DLL
|
|
void assertPageObject();
|
|
|
|
private:
|
|
QPDFObjectHandle(QPDF*, int objid, int generation);
|
|
QPDFObjectHandle(QPDFObject*);
|
|
|
|
enum parser_state_e
|
|
{
|
|
st_top,
|
|
st_start,
|
|
st_stop,
|
|
st_eof,
|
|
st_dictionary,
|
|
st_array
|
|
};
|
|
|
|
// Private object factory methods
|
|
static QPDFObjectHandle newIndirect(QPDF*, int objid, int generation);
|
|
static QPDFObjectHandle newStream(
|
|
QPDF* qpdf, int objid, int generation,
|
|
QPDFObjectHandle stream_dict, qpdf_offset_t offset, size_t length);
|
|
|
|
void typeWarning(char const* expected_type,
|
|
std::string const& warning);
|
|
void objectWarning(std::string const& warning);
|
|
void assertType(char const* type_name, bool istype);
|
|
void dereference();
|
|
void makeDirectInternal(std::set<int>& visited);
|
|
void releaseResolved();
|
|
static void setObjectDescriptionFromInput(
|
|
QPDFObjectHandle, QPDF*, std::string const&,
|
|
PointerHolder<InputSource>, qpdf_offset_t);
|
|
static QPDFObjectHandle parseInternal(
|
|
PointerHolder<InputSource> input,
|
|
std::string const& object_description,
|
|
QPDFTokenizer& tokenizer, bool& empty,
|
|
StringDecrypter* decrypter, QPDF* context,
|
|
bool content_stream);
|
|
void parseContentStream_internal(
|
|
std::string const& description,
|
|
ParserCallbacks* callbacks);
|
|
static void parseContentStream_data(
|
|
PointerHolder<Buffer>,
|
|
std::string const& description,
|
|
ParserCallbacks* callbacks);
|
|
std::vector<QPDFObjectHandle> arrayOrStreamToStreamArray(
|
|
std::string const& description, std::string& all_description);
|
|
static void warn(QPDF*, QPDFExc const&);
|
|
|
|
class Members
|
|
{
|
|
friend class QPDFObjectHandle;
|
|
|
|
public:
|
|
QPDF_DLL
|
|
~Members();
|
|
|
|
private:
|
|
Members();
|
|
Members(QPDF* qpdf, int objid, int generation);
|
|
Members(QPDFObject* data);
|
|
|
|
bool initialized;
|
|
|
|
QPDF* qpdf;
|
|
int objid; // 0 for direct object
|
|
int generation;
|
|
PointerHolder<QPDFObject> obj;
|
|
bool reserved;
|
|
};
|
|
PointerHolder<Members> m;
|
|
};
|
|
|
|
#endif // __QPDFOBJECTHANDLE_HH__
|