1 files changed, 110 insertions, 0 deletions
diff --git a/include/vcl/embeddedfontshelper.hxx b/include/vcl/embeddedfontshelper.hxx
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+++ b/include/vcl/embeddedfontshelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_VCL_EMBEDDEDFONTSHELPER_HXX
+#define INCLUDED_VCL_EMBEDDEDFONTSHELPER_HXX
+
+#include <vcl/dllapi.h>
+
+#include <rtl/ustring.hxx>
+#include <tools/fontenum.hxx>
+#include <tools/long.hxx>
+
+#include <string_view>
+#include <vector>
+
+namespace com::sun::star::io { class XInputStream; }
+namespace com::sun::star::uno { template <typename > class Reference; }
+
+/**
+ Helper functions for handling embedded fonts in documents.
+
+*/
+class VCL_DLLPUBLIC EmbeddedFontsHelper
+{
+private:
+    std::vector<std::pair<OUString, OUString>> m_aAccumulatedFonts;
+
+    /**
+      Adds the given font to the list of known fonts. The font is used only until application
+      exit.
+
+      @param fontName name of the font (e.g. 'Times New Roman')
+      @param fileUrl URL of the font file
+    */
+    static void activateFont( const OUString& fontName, const OUString& fileUrl );
+
+public:
+    /// Specification of what kind of operation is allowed when embedding a font
+    enum class FontRights
+    {
+        ViewingAllowed, ///< Font may be embedded for viewing the document (but not editing)
+        EditingAllowed ///< Font may be embedded for editing document (implies viewing)
+    };
+
+    /**
+      Returns URL for a font file for the given font, or empty if it does not exist.
+    */
+    static OUString fontFileUrl(
+        std::u16string_view familyName, FontFamily family, FontItalic italic,
+        FontWeight weight, FontPitch pitch, FontRights rights );
+
+    /**
+      Reads a font from the input stream, saves it to a temporary font file and adds it to the list of
+      fonts that activateFonts will activate.
+      @param stream stream of font data
+      @param fontName name of the font (e.g. 'Times New Roman')
+      @param extra additional text to use for name (e.g. to distinguish regular from bold, italic,...), "?" for unique
+      @param key key to xor the data with, from the start until the key's length (not repeated)
+      @param eot whether the data is compressed in Embedded OpenType format
+    */
+    bool addEmbeddedFont( const css::uno::Reference< css::io::XInputStream >& stream,
+        const OUString& fontName, const char* extra,
+        std::vector< unsigned char > const & key, bool eot = false);
+
+    /**
+      Returns a URL for a file where to store contents of a given temporary font.
+      The file may or not may not exist yet, and will be cleaned up automatically as appropriate.
+      Use activateTemporaryFont() to actually enable usage of the font.
+
+      @param fontName name of the font (e.g. 'Times New Roman')
+      @param extra additional text to use for name (e.g. to distinguish regular from bold, italic,...), "?" for unique
+    */
+    static OUString fileUrlForTemporaryFont( const OUString& fontName, const char* extra );
+
+    /**
+      Adds the accumulated fonts to the list of known fonts. The fonts are used only until application
+      exit.
+    */
+    void activateFonts();
+
+    /**
+      Returns if the restrictions specified in the font (if present) allow embedding
+      the font for a particular purpose.
+      @param data font data
+      @param size size of the font data
+      @param rights type of operation to be allowed for the font
+    */
+    static bool sufficientTTFRights( const void* data, tools::Long size, FontRights rights );
+
+    /**
+      Removes all temporary fonts in the path used by fileUrlForTemporaryFont().
+      @internal
+    */
+    static void clearTemporaryFontFiles();
+
+    ~EmbeddedFontsHelper() COVERITY_NOEXCEPT_FALSE
+    {
+        activateFonts();
+    }
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */