Remove ununsed vars from mobi.py

src/calibre/ebooks/metadata/mobi.py

@@ -17,7 +17,7 @@ from calibre.ebooks.mobi import MobiError
 from calibre.ebooks.mobi.writer import rescale_image, MAX_THUMB_DIMEN
 from calibre.ebooks.mobi.langcodes import iana2mobi
 
-import struct, traceback
+import struct
 
 class StreamSlicer(object):
 
@@ -74,15 +74,15 @@ class StreamSlicer(object):
             return stream.write(value)
         raise TypeError("stream indices must be integers")
 
-    def update(self, data_blocks):        
+    def update(self, data_blocks):
         # Rewrite the stream
         stream = self._stream
         base = self.start
         stream.seek(base)
         self._stream.truncate(base)
-        for block in data_blocks:            
+        for block in data_blocks:
             stream.write(block)
-        
+
     def truncate(self, value):
         self._stream.truncate(value)
 
@@ -90,7 +90,7 @@ class MetadataUpdater(object):
     def __init__(self, stream):
         self.stream = stream
         data = self.data = StreamSlicer(stream)
-        type = self.type = data[60:68]
+        self.type = data[60:68]
         self.nrecs, = unpack('>H', data[76:78])
         record0 = self.record0 = self.record(0)
         self.encryption_type, = unpack('>H', record0[12:14])
@@ -135,25 +135,24 @@ class MetadataUpdater(object):
             elif id == 202:
                 rindex, = self.thumbnail_rindex, = unpack('>I', content)
                 self.thumbnail_record = self.record(rindex + image_base)
-    
-    def patch(self, off, new_record0):  
+
+    def patch(self, off, new_record0):
         # Save the current size of each record
         record_sizes = [len(new_record0)]
         for i in range(1,self.nrecs-1):
             record_sizes.append(self.pdbrecords[i+1][0]-self.pdbrecords[i][0])
         # And the last one
         record_sizes.append(self.data.stop - self.pdbrecords[self.nrecs-1][0])
-        
+
         # pdbrecord[0] is the offset of record0.  It will not change
         # record1 offset will be offset of record0 + len(new_record0)
         updated_pdbrecords = [self.pdbrecords[0][0]]
         record0_offset = self.pdbrecords[0][0]
-        current_offset = self.pdbrecords[1][0]
         updated_offset = record0_offset + len(new_record0)
-        
+
         for i in range(1,self.nrecs-1):
             updated_pdbrecords.append(updated_offset)
-            updated_offset += record_sizes[i]        
+            updated_offset += record_sizes[i]
         # Update the last pdbrecord
         updated_pdbrecords.append(updated_offset)
 
@@ -175,17 +174,13 @@ class MetadataUpdater(object):
             self.data.stop = updated_pdbrecords[-1] + record_sizes[-1]
 
     def patchSection(self, section, new):
-        if (section + 1 == self.nrecs):
-            endoff = len(self.stream)
-        else:
-            endoff = self.pdbrecords[section + 1][0]
         off = self.pdbrecords[section][0]
         self.patch(off, new)
 
     def create_exth(self, exth=None):
         # Add an EXTH block to record 0, rewrite the stream
         # self.hexdump(self.record0)
-                
+
         # Fetch the title
         title_offset, = struct.unpack('>L', self.record0[0x54:0x58])
         title_length, = struct.unpack('>L', self.record0[0x58:0x5c])
@@ -198,10 +193,10 @@ class MetadataUpdater(object):
             self.record0[0x17] = "\xe8"
             self.record0[0xf4:0xf8] = pack('>L', 0xFFFFFFFF)
             mobi_header_length = 0xe8
-            
+
         # Set EXTH flag (0x40)
         self.record0[0x80:0x84] = pack('>L', self.flags|0x40)
-        
+
         if not exth:
             # Construct an empty EXTH block
             pad = '\0' * 4
@@ -216,23 +211,23 @@ class MetadataUpdater(object):
         new_record0.write(self.record0[:0x10 + mobi_header_length])
         new_record0.write(exth)
         new_record0.write(title_in_file)
-        
+
         # Pad to a 4-byte boundary
         trail = len(new_record0.getvalue()) % 4
         pad = '\0' * (4 - trail) # Always pad w/ at least 1 byte
         new_record0.write(pad)
 
         self.hexdump(new_record0.getvalue())
-       
+
         # Rebuild the stream, update the pdbrecords pointers
         self.patchSection(0,new_record0.getvalue())
-        
+
         # Update record0
         self.record0 = self.record(0)
-              
+
     def hexdump(self, src, length=16):
         # Diagnostic
-        FILTER=''.join([(len(repr(chr(x)))==3) and chr(x) or '.' for x in range(256)])            
+        FILTER=''.join([(len(repr(chr(x)))==3) and chr(x) or '.' for x in range(256)])
         N=0; result=''
         while src:
            s,src = src[:length],src[length:]
@@ -249,14 +244,14 @@ class MetadataUpdater(object):
             flags, val = a1, a2<<16|a3<<8|a4
             pdbrecords.append( [offset, flags, val] )
         return pdbrecords
-    
+
     def update_pdbrecords(self, updated_pdbrecords):
         for (i, pdbrecord) in enumerate(updated_pdbrecords):
             self.data[78+i*8:78+i*8 + 4] = pack('>L',pdbrecord)
 
         # Refresh local copy
         self.pdbrecords = self.get_pdbrecords()
-        
+
     def dump_pdbrecords(self):
         # Diagnostic
         print "MetadataUpdater.dump_pdbrecords()"
@@ -264,7 +259,7 @@ class MetadataUpdater(object):
         for i in xrange(len(self.pdbrecords)):
             pdbrecord = self.pdbrecords[i]
             print "%10X %10X %10X" % (pdbrecord[0], pdbrecord[1], pdbrecord[2])
-            
+
     def record(self, n):
         if n >= self.nrecs:
             raise ValueError('non-existent record %r' % n)
@@ -325,7 +320,6 @@ class MetadataUpdater(object):
         exth = ['EXTH', pack('>II', len(exth) + 12, len(recs)), exth, pad]
         exth = ''.join(exth)
 
-        title = (mi.title or _('Unknown')).encode(self.codec, 'replace')
         if getattr(self, 'exth', None) is None:
             raise MobiError('No existing EXTH record. Cannot update metadata.')