From e890c121465333d48662be879db441e552281920 Mon Sep 17 00:00:00 2001
From: Vegard Storheil Eriksen <zyp@jvnv.net>
Date: Thu, 25 Mar 2010 06:10:16 +0100
Subject: Replaced multihash with pure-python ed2k-hash implementation.

---
 pyanidb/hash.py | 34 ++++++++++++++++++++++++++++++++--
 1 file 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()
-- 
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