Fix loca table when offsets aren't in ascending order.

src/core/fonts.js

@@ -1759,6 +1759,11 @@ var Font = (function FontClosure() {
         var locaCount = dupFirstEntry ? numGlyphs - 1 : numGlyphs;
         for (i = 0, j = itemSize; i < locaCount; i++, j += itemSize) {
           var endOffset = itemDecode(locaData, j);
+          // The spec says the offsets should be in ascending order, however
+          // some fonts use the offset of 0 to mark a glyph as missing.
+          if (endOffset === 0) {
+            endOffset = startOffset;
+          }
           if (endOffset > oldGlyfDataLength &&
               ((oldGlyfDataLength + 3) & ~3) === endOffset) {
             // Aspose breaks fonts by aligning the glyphs to the qword, but not

test/pdfs/.gitignore

@@ -114,6 +114,7 @@
 !issue6541.pdf
 !issue2948.pdf
 !issue6231_1.pdf
+!issue7074_reduced.pdf
 !issue6413.pdf
 !issue4630.pdf
 !issue4909.pdf

test/test_manifest.json

@@ -2715,6 +2715,12 @@
       "rounds": 1,
       "type": "load"
     },
+    {  "id": "issue7074_reduced",
+       "file": "pdfs/issue7074_reduced.pdf",
+       "md5": "46893f8aa33620a05acdc27e3b79469d",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue5540",
       "file": "pdfs/issue5540.pdf",
       "md5": "12b69b19e366232422812ad8b2534f37",