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authorVegard Storheil Eriksen <zyp@jvnv.net>2010-03-25 06:10:16 +0100
committerVegard Storheil Eriksen <zyp@jvnv.net>2010-03-25 06:10:16 +0100
commite890c121465333d48662be879db441e552281920 (patch)
tree712834b52cc26cb1de67b63679934b3de9e02812
parent0148c3ba5042df191a04dd7443be0d50d27b5498 (diff)
Replaced multihash with pure-python ed2k-hash implementation.
-rw-r--r--pyanidb/hash.py34
1 files changed, 32 insertions, 2 deletions
diff --git a/pyanidb/hash.py b/pyanidb/hash.py
index 4aab45f..9727ca2 100644
--- a/pyanidb/hash.py
+++ b/pyanidb/hash.py
@@ -1,9 +1,39 @@
-import multihash, threading, time, os
+import threading, time, os, hashlib
try:
import xattr
except ImportError:
xattr = None
+class Hash:
+ def __init__(self, filename, algorithms):
+ update_list = [getattr(self, 'update_%s' % a) for a in algorithms]
+ self.md4_partial = hashlib.new('md4')
+ self.md4_final = hashlib.new('md4')
+ self.size_total = 0
+ f = open(filename)
+ data = f.read(131072)
+ while data:
+ for u in update_list:
+ u(data)
+ data = f.read(131072)
+
+ def update_ed2k(self, data):
+ pos = 0
+ while pos < len(data):
+ if (not (self.size_total % 9728000)) and self.size_total:
+ self.md4_final.update(self.md4_partial.digest())
+ self.md4_partial = hashlib.new('md4')
+ size = min(len(data) - pos, 9728000 - (self.size_total % 9728000))
+ self.md4_partial.update(data[pos:pos + size])
+ pos += size
+ self.size_total += size
+
+ def ed2k(self):
+ if self.size_total > 9728000:
+ self.md4_final.update(self.md4_partial.digest())
+ return self.md4_final.hexdigest()
+ return self.md4_partial.hexdigest()
+
class File:
def __init__(self, name, algorithms, cache):
self.name = name
@@ -14,7 +44,7 @@ class File:
self.read_cache()
if False in [hasattr(self, a) for a in algorithms]:
self.cached = False
- h = multihash.hash_file(name, algorithms)
+ h = Hash(name, algorithms)
for a in algorithms:
setattr(self, a, getattr(h, a)())
self.write_cache()