def construct_subhash_vectors(fname, dup_map):
"""collect set of checksums per file, substituting numeric id (fno, hno)
for text values"""
result = []
FnameMap.reset() # initialize mapping tables
ChecksumMap.reset()
fd = open(fname)
last_name = ""
hash_set = []
for text in fd:
(val, name) = parse_md5deep_subfile_entry(text)
if name != last_name:
vec = construct_vector(last_name, hash_set, dup_map)
if vec:
result.append(vec)
last_name = name
hash_set = []
hash_set.append(val)
vec = construct_vector(name, hash_set, dup_map)
if vec:
result.append(vec)
fd.close()
return result
def build_graph_from_vectors(vector_set, show_subgraph=False):
"creates top-level fraph from set of vectors"
B = nx.Graph()
for fno, hset in vector_set:
B.add_node(FnameMap.encode(fno), bipartite=0)
for hno in hset:
if hno not in B:
B.add_node(ChecksumMap.encode(hno), bipartite=1)
B.add_edge(FnameMap.encode(fno), ChecksumMap.encode(hno))
return B
def construct_vector(name, hash_set, dup_map):
if name == "": # skipping - no file
return False
if name in dup_map: # skipping -- duplicate
return False
if len(hash_set) < 2: # skipping -- empty or singleton
return False
return [FnameMap.get_id(name),
[ChecksumMap.get_id(hval) for hval in hash_set]]
def prune_vectors(vector_set, min_blocks):
"only keep vectors containing at least 1 shared checksum"
result = []
for fno, hset in vector_set:
newset = []
for hno in hset:
if ChecksumMap.get_count(hno) > 1:
newset.append(hno)
if len(newset) >= min_blocks:
result.append([fno, newset])
return result
def find_conflicting_checksums(csums, graph):
"find those block checksums that map to the same file region"
range_sets = {}
for hno in csums:
range_val = ChecksumMap.get_range_using_encoded_id(hno)
if range_val in range_sets:
range_sets[range_val].append(hno)
else:
range_sets[range_val] = [hno]
compatible = [value[0] for key, value in range_sets.items()
if len(value) == 1]
# below line is pythonic, but a bit confusing. sum used
# to merge list of lists
conflicting = sum([value for key, value in range_sets.items()
if len(value) > 1], [])
ranges = {key: value for key, value in range_sets.items()
if len(value) > 1}
return compatible, conflicting, ranges
def resolve_csums(csums):
resolved_checksums = [ChecksumMap.get_hval_using_encoded_id(hno)
for hno in csums]
return resolved_checksums
