Encoding tables

PdfForQtLib/sources/pdfdocument.h

@@ -22,6 +22,9 @@
 #include "pdfglobal.h"
 #include "pdfobject.h"
 
+#include <QtCore>
+#include <QDateTime>
+
 namespace pdf
 {
 
@@ -56,6 +59,10 @@ public:
 
     }
 
+    /// Returns object from the object storage. If invalid reference is passed,
+    /// then null object is returned (no exception is thrown).
+    const PDFObject& getObject(PDFObjectReference reference) const;
+
     /// Returns array of objects stored in this storage
     const PDFObjects& getObjects() const { return m_objects; }
 
@@ -70,24 +77,82 @@ private:
 /// PDF document main class.
 class PDFDocument
 {
+    Q_DECLARE_TR_FUNCTIONS(pdf::PDFDocument)
+
 public:
     explicit PDFDocument() = default;
 
     const PDFObjectStorage& getStorage() const { return m_pdfObjectStorage; }
 
+    /// Info about the document. Title, Author, Keywords...
+    struct Info
+    {
+        /// Indicates, that document was modified that it includes trapping information.
+        /// See PDF Reference 1.7, Section 10.10.5 "Trapping Support".
+        enum class Trapped
+        {
+            True,       ///< Fully trapped
+            False,      ///< Not yet trapped
+            Unknown     ///< Either unknown, or it has been trapped partly, not fully
+        };
+
+        QString title;
+        QString author;
+        QString subject;
+        QString keywords;
+        QString creator;
+        QString producer;
+        QDateTime creationDate;
+        QDateTime modifiedDate;
+        Trapped trapped = Trapped::Unknown;
+    };
+
+    /// Returns info about the document (title, author, etc.)
+    const Info* getInfo() const { return &m_info; }
+
 private:
     friend class PDFDocumentReader;
 
     explicit PDFDocument(PDFObjectStorage&& storage) :
         m_pdfObjectStorage(std::move(storage))
     {
-
+        init();
     }
 
+    /// Initialize data based on object in the storage.
+    /// Can throw exception if error is detected.
+    void init();
+
+    /// Initialize the document info from the trailer dictionary.
+    /// If document info is not present, then default document
+    /// info is used. If error is detected, exception is thrown.
+    void initInfo();
+
+    /// If object is reference, the dereference attempt is performed
+    /// and object is returned. If it is not a reference, then self
+    /// is returned. If dereference attempt fails, then null object
+    /// is returned (no exception is thrown).
+    const PDFObject& getObject(const PDFObject& object) const;
+
     /// Storage of objects
     PDFObjectStorage m_pdfObjectStorage;
+
+    /// Info about the PDF document
+    Info m_info;
 };
 
+inline
+const PDFObject& PDFDocument::getObject(const PDFObject& object) const
+{
+    if (object.isReference())
+    {
+        // Try to dereference the object
+        return m_pdfObjectStorage.getObject(object.getReference());
+    }
+
+    return object;
+}
+
 }   // namespace pdf
 
 #endif // PDFDOCUMENT_H