From cc0185ba929a38e4038f7ca89c4e7c5923b5c396 Mon Sep 17 00:00:00 2001
From: "Marshall T. Vandegrift" <llasram@gmail.com>
Date: Wed, 31 Dec 2008 09:44:11 -0500
Subject: [PATCH] Fix bugs in generation of uncrossable breaks.

---
 src/calibre/ebooks/mobi/writer.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/calibre/ebooks/mobi/writer.py b/src/calibre/ebooks/mobi/writer.py
index b15254c334..63e15b6484 100644
--- a/src/calibre/ebooks/mobi/writer.py
+++ b/src/calibre/ebooks/mobi/writer.py
@@ -241,12 +241,13 @@ class MobiWriter(object):
             record = [data, '\0']
             nextra = 0
             pbreak = 0
-            running = 0
+            running = offset
             while breaks and (breaks[0] - offset) < RECORD_SIZE:
                 pbreak = (breaks.pop(0) - running) >> 3
-                record.append(decint(pbreak))
+                encoded = decint(pbreak)
+                record.append(encoded)
                 running += pbreak << 3
-                nextra += 1
+                nextra += len(encoded)
             record.append(decint(nextra + 1))
             self._records.append(''.join(record))
             nrecords += 1