These modules are now declared obsolete.

Lib/cmpcache.py

@@ -1,64 +0,0 @@
-"""Efficiently compare files, boolean outcome only (equal / not equal).
-
-Tricks (used in this order):
-    - Use the statcache module to avoid statting files more than once
-    - Files with identical type, size & mtime are assumed to be clones
-    - Files with different type or size cannot be identical
-    - We keep a cache of outcomes of earlier comparisons
-    - We don't fork a process to run 'cmp' but read the files ourselves
-"""
-
-import os
-from stat import *
-import statcache
-
-
-# The cache.
-#
-cache = {}
-
-
-def cmp(f1, f2, shallow=1):
-    """Compare two files, use the cache if possible.
-    May raise os.error if a stat or open of either fails.
-    Return 1 for identical files, 0 for different.
-    Raise exceptions if either file could not be statted, read, etc."""
-    s1, s2 = sig(statcache.stat(f1)), sig(statcache.stat(f2))
-    if not S_ISREG(s1[0]) or not S_ISREG(s2[0]):
-        # Either is a not a plain file -- always report as different
-        return 0
-    if shallow and s1 == s2:
-        # type, size & mtime match -- report same
-        return 1
-    if s1[:2] <> s2[:2]: # Types or sizes differ, don't bother
-        # types or sizes differ -- report different
-        return 0
-    # same type and size -- look in the cache
-    key = f1 + ' ' + f2
-    if cache.has_key(key):
-        cs1, cs2, outcome = cache[key]
-        # cache hit
-        if s1 == cs1 and s2 == cs2:
-            # cached signatures match
-            return outcome
-        # stale cached signature(s)
-    # really compare
-    outcome = do_cmp(f1, f2)
-    cache[key] = s1, s2, outcome
-    return outcome
-
-def sig(st):
-    """Return signature (i.e., type, size, mtime) from raw stat data."""
-    return S_IFMT(st[ST_MODE]), st[ST_SIZE], st[ST_MTIME]
-
-def do_cmp(f1, f2):
-    """Compare two files, really."""
-    #print '    cmp', f1, f2 # XXX remove when debugged
-    bufsize = 8*1024 # Could be tuned
-    fp1 = open(f1, 'rb')
-    fp2 = open(f2, 'rb')
-    while 1:
-        b1 = fp1.read(bufsize)
-        b2 = fp2.read(bufsize)
-        if b1 <> b2: return 0
-        if not b1: return 1