77 …    table = [unpack_table_elem(s[i:i + table_elem_size]) for i in xrange(0, size, table_elem_size)]
78         return table
84     def write_table(self, offset, table):  argument
85         s = ''.join(pack_table_elem(x) for x in table)
88 def random_table_item(table):  argument
89     vals = [(index, offset) for index, offset in enumerate(table) if offset != 0]
91         err('cannot pick random item because table is empty')
94 def corrupt_table_duplicate(table):  argument
95     '''Corrupt a table by introducing a duplicate offset'''
96     victim_idx, victim_val = random_table_item(table)
97     unique_vals = set(table)
99         err('no duplication corruption possible in table')
101     table[victim_idx] = dup_val
103 def corrupt_table_invalidate(qed, table):  argument
104     '''Corrupt a table by introducing an invalid offset'''
105     index, _ = random_table_item(table)
106     table[index] = qed.filesize + random.randint(0, 100 * 1024 * 1024 * 1024 * 1024)
121     '''duplicate l1|l2 - Duplicate a random table element'''
124         table = qed.l1_table
127         table = qed.read_table(offset)
130     corrupt_table_duplicate(table)
131     qed.write_table(offset, table)
134     '''invalidate l1|l2 - Plant an invalid table element at random'''
137         table = qed.l1_table
140         table = qed.read_table(offset)
143     corrupt_table_invalidate(qed, table)
144     qed.write_table(offset, table)
171             err('no l2 table allocated')
194     # Copy L1 table