From 800614382942330bedbbcd4cd694639dca094303 Mon Sep 17 00:00:00 2001
From: Tavmjong Bah <tavmjong@free.fr>
Date: Fri, 20 Sep 2019 09:40:59 +0200
Subject: Handle SVG in OpenType fonts with compressed glyphs.

---
 src/libnrtype/OpenTypeUtil.cpp | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

(limited to 'src/libnrtype')

diff --git a/src/libnrtype/OpenTypeUtil.cpp b/src/libnrtype/OpenTypeUtil.cpp
index b5a0760ee..2b60cca9e 100644
--- a/src/libnrtype/OpenTypeUtil.cpp
+++ b/src/libnrtype/OpenTypeUtil.cpp
@@ -24,6 +24,9 @@
 #include <harfbuzz/hb-ft.h>
 #include <harfbuzz/hb-ot.h>
 
+// SVG in OpenType
+#include "util/ziptool.h"
+
 
 // Utilities used in this file
 
@@ -378,8 +381,29 @@ void readOpenTypeSVGTable(const FT_Face ft_face,
         //           << "  Offset: " << offsetGlyph << " Length: " << lengthGlyph << std::endl;
 
         std::string svg;
-        for (unsigned int c = offsetGlyph; c < offsetGlyph + lengthGlyph; ++c) {
-            svg += (char) data[offset + c];
+
+        if (lengthGlyph > 1 && data[offset] & 0x1f && data[offset + 1] & 0x8b) {
+            // Glyph is gzipped
+
+            std::vector<unsigned char> buffer;
+            for (unsigned int c = offsetGlyph; c < offsetGlyph + lengthGlyph; ++c) {
+                buffer.push_back(data[offset + c]);
+            }
+
+            GzipFile zipped;
+            zipped.readBuffer(buffer);
+
+            std::vector<unsigned char> unzipped_data = zipped.getData();
+            for (auto i : unzipped_data) {
+                svg += (char)i;
+            }
+
+        } else {
+            // Glyph is not compressed
+
+            for (unsigned int c = offsetGlyph; c < offsetGlyph + lengthGlyph; ++c) {
+                svg += (unsigned char) data[offset + c];
+            }
         }
 
         for (unsigned int i = startGlyphID; i < endGlyphID+1; ++i) {
-- 
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