1 files changed, 95 insertions, 0 deletions
diff --git a/src/extension/internal/pdfinput/poppler-utils.h b/src/extension/internal/pdfinput/poppler-utils.h
new file mode 100644
index 0000000..3cdec07
--- /dev/null
+++ b/src/extension/internal/pdfinput/poppler-utils.h
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * PDF parsing utilities for libpoppler.
+ *//*
+ * Authors:
+ *    Martin Owens
+ * 
+ * Copyright (C) 2022 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef POPPLER_UTILS_H
+#define POPPLER_UTILS_H
+
+#include <map>
+#include <memory>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+#include "poppler-transition-api.h"
+
+namespace Geom {
+class Affine;
+}
+class Dict;
+class FNVHash;
+class GfxFont;
+class GfxState;
+class Object;
+class PDFDoc;
+class Ref;
+class XRef;
+
+Geom::Affine stateToAffine(GfxState *state);
+Geom::Affine ctmToAffine(const double *ctm);
+
+void ctmout(const char *label, const double *ctm);
+void affout(const char *label, Geom::Affine affine);
+
+#if POPPLER_CHECK_VERSION(22, 4, 0)
+typedef std::shared_ptr<GfxFont> FontPtr;
+#else
+typedef GfxFont *FontPtr;
+#endif
+
+class FontData
+{
+public:
+    FontData(FontPtr font);
+    std::string getSubstitute() const;
+    std::string getSpecification() const;
+
+    bool found = false;
+
+    std::unordered_set<int> pages;
+    std::string name;
+    std::string family;
+
+    std::string style;
+    std::string weight;
+    std::string stretch;
+    std::string variation;
+
+private:
+    void _parseStyle();
+};
+
+typedef std::shared_ptr<std::map<FontPtr, FontData>> FontList;
+
+FontList getPdfFonts(std::shared_ptr<PDFDoc> pdf_doc);
+std::string getDictString(Dict *dict, const char *key);
+
+// Replacate poppler FontDict
+class InkFontDict
+{
+public:
+    // Build the font dictionary, given the PDF font dictionary.
+    InkFontDict(XRef *xref, Ref *fontDictRef, Dict *fontDict);
+
+    // Iterative access.
+    int getNumFonts() const { return fonts.size(); }
+
+    // Get the specified font.
+    FontPtr lookup(const char *tag) const;
+    FontPtr getFont(int i) const { return fonts[i]; }
+    std::vector<FontPtr> fonts;
+
+private:
+    int hashFontObject(Object *obj);
+    void hashFontObject1(const Object *obj, FNVHash *h);
+};
+
+#endif /* POPPLER_UTILS_H */