From cbe829228e77e13baa984e1f4d83c9179852c06d Mon Sep 17 00:00:00 2001
From: Yury Delendik <ydelendik@mozilla.com>
Date: Fri, 22 Feb 2013 22:08:46 -0600
Subject: [PATCH] Fixes symbols positioning in JBIG2

---
 src/jbig2.js                 | 2 +-
 test/pdfs/issue2642.pdf.link | 1 +
 test/test_manifest.json      | 8 ++++++++
 3 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 test/pdfs/issue2642.pdf.link

diff --git a/src/jbig2.js b/src/jbig2.js
index 5a81bdf82..0c1973b8f 100644
--- a/src/jbig2.js
+++ b/src/jbig2.js
@@ -823,7 +823,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
         textRegion.transposed = !!(textRegionSegmentFlags & 64);
         textRegion.combinationOperator = (textRegionSegmentFlags >> 7) & 3;
         textRegion.defaultPixelValue = (textRegionSegmentFlags >> 9) & 1;
-        textRegion.dsOffset = (textRegionSegmentFlags >> 10) & 31;
+        textRegion.dsOffset = (textRegionSegmentFlags << 17) >> 27;
         textRegion.refinementTemplate = (textRegionSegmentFlags >> 15) & 1;
         if (textRegion.huffman) {
           var textRegionHuffmanFlags = readUint16(data, position);
diff --git a/test/pdfs/issue2642.pdf.link b/test/pdfs/issue2642.pdf.link
new file mode 100644
index 000000000..c49ae94e7
--- /dev/null
+++ b/test/pdfs/issue2642.pdf.link
@@ -0,0 +1 @@
+https://bugzilla.mozilla.org/attachment.cgi?id=707492
diff --git a/test/test_manifest.json b/test/test_manifest.json
index d481fc57b..df6e77407 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -489,6 +489,14 @@
       "link": true,
       "type": "eq"
     },
+    {  "id": "issue2642",
+      "file": "pdfs/issue2642.pdf",
+      "md5": "b6679861fdce3bbab0c1fa51bb7f5077",
+      "rounds": 1,
+      "lastPage": 1,
+      "link": true,
+      "type": "eq"
+    },
     {  "id": "issue1015",
       "file": "pdfs/issue1015.pdf",
       "md5": "b61503d1b445742b665212866afb60e2",