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Object loading

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This commit is contained in:
Jakub Melka
2018-11-25 14:48:08 +01:00
parent 8c93c82228
commit 89d4ee606b
12 changed files with 234 additions and 18 deletions
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28
PdfForQtLib/sources/pdfparser.h
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@ -23,10 +23,12 @@
#include "pdfobject.h"
#include <QtCore>
#include <QMutex>
#include <QVariant>
#include <QByteArray>
#include <set>
#include <functional>
namespace pdf
{
@ -199,12 +201,14 @@ private:
const char* m_end;
};
/// Parsing context. Used for example to detect cyclic reference errors.
/// Parsing context. Used for example to detect cyclic reference errors. Can handle multiple threads
/// simultaneously (e.g class is thread safe).
class PDFParsingContext
{
Q_DECLARE_TR_FUNCTIONS(pdf::PDFParsingContext)
public:
explicit PDFParsingContext() = default;
/// Guard guarding the cyclical references.
class PDFParsingContextGuard
@ -231,12 +235,32 @@ public:
/// then same object is returned.
PDFObject getObject(const PDFObject& object) const;
/// Sets function which provides object fetching
void setObjectFetcher(std::function<PDFObject(PDFObjectReference)> objectFetcher) { m_objectFetcher = std::move(objectFetcher); }
private:
void beginParsingObject(PDFObjectReference reference);
void endParsingObject(PDFObjectReference reference);
struct Key
{
constexpr inline Key() = default;
constexpr inline Key(Qt::HANDLE threadContext, PDFObjectReference reference) : threadContext(threadContext), reference(reference) { }
Qt::HANDLE threadContext = nullptr;
PDFObjectReference reference;
inline bool operator<(const Key& other) const { return std::tie(threadContext, reference) < std::tie(other.threadContext, other.reference); }
};
/// This function fetches object, if it is needed
std::function<PDFObject(PDFObjectReference)> m_objectFetcher;
/// Set containing objects currently being parsed.
std::set<PDFObjectReference> m_activeParsedObjectSet;
std::set<Key> m_activeParsedObjectSet;
/// Mutex protecting object for multiple thread access
QMutex m_mutex;
};
/// Class for parsing objects. Checks cyclical references. If