156 lines
3.8 KiB
C++
156 lines
3.8 KiB
C++
/*
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Copyright 2021 Grégory Soutadé
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This file is part of uPDFParser.
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uPDFParser is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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uPDFParser is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with uPDFParser. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _UPDFPARSER_HPP_
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#define _UPDFPARSER_HPP_
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#include <exception>
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#include <map>
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#include <vector>
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#include <string>
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#include <sstream>
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#include <iostream>
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#include <iomanip>
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#include <string.h>
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#include <unistd.h>
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#include "uPDFTypes.h"
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#include "uPDFObject.h"
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namespace uPDFParser
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{
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class XRefValue;
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/**
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* @brief PDF Parser
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*/
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class Parser
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{
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public:
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Parser(int version_major=1, int version_minor=6):
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version_major(version_major), version_minor(version_minor), fd(0)
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{}
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~Parser()
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{
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if (fd) close(fd);
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std::vector<Object*>::iterator it;
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for(it=_objects.begin(); it!=_objects.end(); it++)
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delete *it;
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}
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/**
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* @brief Parse a file
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*/
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void parse(const std::string& filename);
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/**
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* @brief Write a PDF file with internal objects
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*
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* @param filename File path
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* @param update Only append new objects if true
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* Write a new PDF file if false (not supported for now)
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*/
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void write(const std::string& filename, bool update=false);
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/**
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* @brief Get internals (or parsed) objects
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*/
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std::vector<Object*>& objects() { return _objects; }
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/**
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* @brief Add an object
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*/
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void addObject(Object* object) { _objects.push_back(object); }
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/**
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* @brief Return trailer object
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*/
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Object& getTrailer() {return trailer; }
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/**
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* @brief Return xref table. This table is read and updated only once after parse
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* Further add/delete will make it incoherent
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*/
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const std::vector<XRefValue>& xrefTable() {return _xrefTable;}
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/**
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* @brief Return a specific object
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*/
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Object* getObject(int objectId, int generationNumber=0);
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private:
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void parseObject(std::string& token);
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void parseHeader();
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void parseStartXref();
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bool parseXref();
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bool parseTrailer();
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std::string nextToken(bool exceptionOnEOF=true, bool readComment=false);
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DataType* parseType(std::string& token, Object* object, std::map<std::string, DataType*>& dict);
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void parseDictionary(Object* object, std::map<std::string, DataType*>& dict);
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DataType* parseSignedNumber(std::string& token);
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DataType* parseNumber(std::string& token);
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DataType* parseNumberOrReference(std::string& token);
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Array* parseArray(Object* object);
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String* parseString();
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HexaString* parseHexaString();
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Stream* parseStream(Object* object);
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Name* parseName(std::string& token);
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void writeUpdate(const std::string& filename);
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int version_major, version_minor;
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std::vector<Object*> _objects;
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Object trailer;
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off_t xrefOffset;
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int fd;
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off_t curOffset;
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std::vector<XRefValue> _xrefTable;
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};
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class XRefValue
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{
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public:
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XRefValue(int objectId, int offset, int generationNumber, bool used, Object* object=0):
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_objectId(objectId), _offset(offset), _generationNumber(generationNumber), _used(used),
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_object(object)
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{}
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int objectId() {return _objectId;}
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int offset() {return _offset;}
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int generationNumber() {return _generationNumber;}
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bool used() {return _used;}
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void setObject(Object* object) { _object = object; }
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Object* object() { return _object; }
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private:
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int _objectId;
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int _offset;
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int _generationNumber;
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bool _used;
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Object* _object;
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};
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}
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#endif
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