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Provide another hashing scheme

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This commit is contained in:
Thomas Nagy 2011-10-17 18:52:01 +02:00
parent 9fab9e0f6b
commit 1f4edf5ace
1 changed files with 16 additions and 3 deletions
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19
waflib/extras/md5_tstamp.py
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@ -17,6 +17,7 @@ try: import cPickle
except: import pickle as cPickle
from waflib import Utils, Build, Context
STRONGEST = True
Context.DBFILE += '_md5tstamp'
Build.hash_cache = {}
@ -46,9 +47,21 @@ def h_file(filename):
if Build.hash_cache[filename][0] == str(st.st_mtime):
return Build.hash_cache[filename][1]
m = Utils.md5()
m.update(str(st.st_mtime))
m.update(str(st.st_size))
m.update(filename)
if STRONGEST:
f = open(filename, 'rb')
read = 1
try:
while read:
read = f.read(100000)
m.update(read)
finally:
f.close()
else:
m.update(str(st.st_mtime))
m.update(str(st.st_size))
m.update(filename)
# ensure that the cache is overwritten
Build.hash_cache[filename] = (str(st.st_mtime), m.digest())
return m.digest()