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Refactoring of document reading

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Jakub Melka
2020-09-17 19:17:16 +02:00
parent eb253f8417
commit 2637dfed17
4 changed files with 432 additions and 355 deletions
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31
PdfForQtLib/sources/pdfdocumentreader.h
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@ -22,12 +22,15 @@
#include "pdfglobal.h"
#include "pdfdocument.h"
#include "pdfprogress.h"
#include "pdfxreftable.h"
#include <QtCore>
#include <QIODevice>
namespace pdf
{
class PDFXRefTable;
class PDFParsingContext;
/// This class is a reader of PDF document from various devices (file, io device,
/// byte buffer). This class doesn't throw exceptions, to check errors, use
@ -37,7 +40,7 @@ class PDFFORQTLIBSHARED_EXPORT PDFDocumentReader
Q_DECLARE_TR_FUNCTIONS(pdf::PDFDocumentReader)
public:
explicit PDFDocumentReader(PDFProgress* progress, const std::function<QString(bool*)>& getPasswordCallback);
explicit PDFDocumentReader(PDFProgress* progress, const std::function<QString(bool*)>& getPasswordCallback, bool permissive);
constexpr inline PDFDocumentReader(const PDFDocumentReader&) = delete;
constexpr inline PDFDocumentReader(PDFDocumentReader&&) = delete;
@ -75,6 +78,9 @@ public:
/// Get source data of the document
const QByteArray& getSource() const { return m_source; }
/// Returns warning messages
const QStringList& getWarnings() const { return m_warnings; }
private:
static constexpr const int FIND_NOT_FOUND_RESULT = -1;
@ -90,6 +96,20 @@ private:
/// \returns Position of string, or FIND_NOT_FOUND_RESULT
int findFromEnd(const char* what, const QByteArray& byteArray, int limit);
void checkFooter(const QByteArray& buffer);
void checkHeader(const QByteArray& buffer);
const PDFInteger findXrefTableOffset(const QByteArray& buffer);
Result processReferenceTableEntries(PDFXRefTable* xrefTable, const std::vector<PDFXRefTable::Entry>& occupiedEntries, PDFObjectStorage::PDFObjects& objects);
Result processSecurityHandler(const PDFObject& trailerDictionaryObject, const std::vector<PDFXRefTable::Entry>& occupiedEntries, PDFObjectStorage::PDFObjects& objects);
void processObjectStreams(PDFXRefTable* xrefTable, PDFObjectStorage::PDFObjects& objects);
/// This function fetches object from the buffer from the specified offset.
/// Can throw exception, returns a pair of scanned reference and object content.
PDFObject getObject(PDFParsingContext* context, PDFInteger offset, PDFObjectReference reference) const;
/// Fetch object from reference table
PDFObject getObjectFromXrefTable(PDFXRefTable* xrefTable, PDFParsingContext* context, PDFObjectReference reference) const;
void progressStart(size_t stepCount, QString text);
void progressStep();
void progressFinish();
@ -115,6 +135,15 @@ private:
/// Raw document data (byte array containing source data for created document)
QByteArray m_source;
/// Security handler
PDFSecurityHandlerPointer m_securityHandler;
/// Be permissive when reading, tolerate errors and try to fix broken document
bool m_permissive;
/// Warnings
QStringList m_warnings;
};
} // namespace pdf