Fixes cmap when 0xFFFF character is included

src/fonts.js

@@ -2498,7 +2498,8 @@ var Font = (function FontClosure() {
                '\x00\x01' + // encodingID
                string32(4 + numTables * 8); // start of the table record
 
-    var segCount = ranges.length + 1;
+    var trailingRangesCount = ranges[ranges.length - 1][1] < 0xFFFF ? 1 : 0;
+    var segCount = ranges.length + trailingRangesCount;
     var segCount2 = segCount * 2;
     var searchRange = getMaxPower2(segCount) * 2;
     var searchEntry = Math.log(segCount) / Math.log(2);
@@ -2513,7 +2514,7 @@ var Font = (function FontClosure() {
     var bias = 0;
 
     if (deltas) {
-      for (var i = 0; i < segCount - 1; i++) {
+      for (var i = 0, ii = ranges.length; i < ii; i++) {
         var range = ranges[i];
         var start = range[0];
         var end = range[1];
@@ -2530,7 +2531,7 @@ var Font = (function FontClosure() {
           glyphsIds += string16(deltas[codes[j]]);
       }
     } else {
-      for (var i = 0; i < segCount - 1; i++) {
+      for (var i = 0, ii = ranges.length; i < ii; i++) {
         var range = ranges[i];
         var start = range[0];
         var end = range[1];
@@ -2543,10 +2544,12 @@ var Font = (function FontClosure() {
       }
     }
 
-    endCount += '\xFF\xFF';
-    startCount += '\xFF\xFF';
-    idDeltas += '\x00\x01';
-    idRangeOffsets += '\x00\x00';
+    if (trailingRangesCount > 0) {
+      endCount += '\xFF\xFF';
+      startCount += '\xFF\xFF';
+      idDeltas += '\x00\x01';
+      idRangeOffsets += '\x00\x00';
+    }
 
     var format314 = '\x00\x00' + // language
                     string16(segCount2) +

test/pdfs/.gitignore

@@ -17,6 +17,7 @@
 !devicen.pdf
 !cmykjpeg.pdf
 !issue840.pdf
+!issue2074.pdf
 !scan-bad.pdf
 !pdfjsbad1586.pdf
 !freeculture.pdf

test/test_manifest.json

@@ -699,6 +699,12 @@
       "rounds": 1,
       "type": "load"
     },
+    {  "id": "issue2074",
+      "file": "pdfs/issue2074.pdf",
+      "md5": "5e4ba2241fc35d20e44eb52289a569ab",
+      "rounds": 1,
+      "type": "eq"
+    },
     {  "id": "colorkeymask",
       "file": "pdfs/colorkeymask.pdf",
       "md5": "9f11e815b485f7f0e1fa5c116c636cf9",