[KevinH]

Hi,

The bug is in Mobi_Unpack in the file mobi_split.py. The test for srcs > 0 ignores the fact that the srcs value is unsigned and therefore tries to unpack it even when it should not.

Here is the fix:

--- mobi_split.py~	2012-03-01 18:16:17.000000000 -0500
+++ mobi_split.py	2012-04-17 14:53:18.000000000 -0400
@@ -241,7 +241,7 @@
         # check if there are SRCS records and delete them
         srcs = getint(datain_rec0,srcs_index)
         num_srcs = getint(datain_rec0,srcs_count)
-        if srcs > 0:
+        if srcs != 0xffffffff and num_srcs > 0:
             self.result_file7 = deletesectionrange(self.result_file7,srcs,srcs+num_srcs-1)
             datain_rec0 = writeint(datain_rec0,srcs_index,0xffffffff)
             datain_rec0 = writeint(datain_rec0,srcs_count,0)

Using any good text editor, edit the file lib/mobi_split.py and go to line 244 and replace

if srcs > 0:

with

if srcs != 0xffffffff and num_srcs > 0:

being careful to make sure you do not mess up the indentation level (whitespace at the beginning of that line).

If it would help, I can post a pre-release version of Mobi_Unpack_v049 - with that fix. We are waiting for Calibre to support the .azw3 file extension for standalone mobi8 mobi files before releasing.

Thanks for the bug report.

KevinH