Fix overflow errors in LRFMetaFile when setting thumbnails

Fix #1

libprs500/gui/database.py

@@ -126,20 +126,28 @@ class LibraryDatabase(object):
         try:
             data.seek(0)
             data = data.read()
-        except AttributeError: pass 
-        if ext: ext = ext.strip().lower()
+        except AttributeError: pass
+        size = len(data)
+        if ext: 
+            ext = ext.strip().lower()
         data = sqlite.Binary(compress(data))
         cur = self.con.execute("select extension from books_data where id=? "+\
                                "and extension=?", (_id, ext))
         present = True
-        try: cur.next()
-        except: present = False
+        try: 
+            cur.next()
+        except: 
+            present = False
         if present:
             self.con.execute("update books_data set data=? where id=? "+\
                              "and extension=?", (data, _id, ext))
         else:
             self.con.execute("insert into books_data (id, extension, data) "+\
                              "values (?, ?, ?)", (_id, ext, data))
+        oldsize = self.get_row_by_id(_id, ['size'])['size']
+        if size > oldsize:
+            self.con.execute("update books_meta set size=? where id=? ", \
+                             (size, _id))
         self.con.commit()
     
     def get_meta_data(self, _id):
@@ -201,7 +209,18 @@ class LibraryDatabase(object):
             lrf = LRFMetaFile(c)
             lrf.thumbnail = cover
             self.add_format(_id, "lrf", c.getvalue())
+            self.update_max_size(_id)
         self.commit()
+    
+    def update_max_size(self, _id):        
+        cur = self.con.execute("select length(data) from books_data where id=?", \
+                                (_id,))
+        maxsize = 0
+        for row in cur:
+            maxsize = row[0] if row[0] > maxsize else maxsize
+        self.con.execute("update books_meta set size=? where id=? ", \
+                             (maxsize, _id))
+        self.con.commit()
 
 
 

libprs500/gui/widgets.py

@@ -421,14 +421,17 @@ class LibraryBooksModel(QAbstractTableModel):
         data = str(qb.data())
         qb.close()
         self.db.update_cover(_id, data)
+        self.refresh_row(index.row())
     
     def add_formats(self, paths, index):
         for path in paths:
             f = open(path, "rb")      
             title = os.path.basename(path)
             ext = title[title.rfind(".")+1:].lower() if "." in title > -1 else None
-            self.db.add_format(self.id_from_index(index), ext, f)
+            _id = self.id_from_index(index)
+            self.db.add_format(_id, ext, f)
             f.close()
+        self.refresh_row(index.row())
         self.emit(SIGNAL('formats_added'), index)
     
     def rowCount(self, parent): 
@@ -519,11 +522,11 @@ class LibraryBooksModel(QAbstractTableModel):
     def id_from_row(self, row): return self._data[row]["id"]
     
     def refresh_row(self, row):
-        self._data[row] = self.db.get_row_by_id(self._data[row]["id"], \
-                                                self.FIELDS)
+        datum = self.db.get_row_by_id(self._data[row]["id"], self.FIELDS)
+        self._data[row:row+1] = [datum]
         for i in range(len(self._orig_data)):
-            if self._orig_data[i]["id"] == self._data[row]["id"]:
-                self._orig_data[i:i+1] = self._data[row]
+            if self._orig_data[i]["id"] == datum["id"]:
+                self._orig_data[i:i+1] = [datum]
                 break
         self.emit(SIGNAL("dataChanged(QModelIndex, QModelIndex)"), \
                     self.index(row, 0), self.index(row, self.columnCount(0)-1))

libprs500/lrf/meta.py

@@ -294,7 +294,11 @@ class LRFMetaFile(object):
                 offset = self.unpack(fmt=DWORD, start=pos)[0] + delta
             except struct.error: 
                 break
-            self.pack(offset, fmt=DWORD, start=pos)
+            if offset >= (2**8)**4:
+                # New offset is larger than a DWORD, so leave 
+                # offset unchanged
+                offset -= delta
+            self.pack(offset, fmt=DWORD, start=pos)            
             try: 
                 self._file.read(12)
             except EOFError: 
@@ -397,7 +401,3 @@ def main():
             print str(f[1]) + ":", lrf.__getattribute__(f[0])
     if options.get_thumbnail: 
         print "Thumbnail:", td
-
-# This turns overflow warnings into errors
-import warnings
-warnings.simplefilter("error", DeprecationWarning)