These modules are now declared obsolete.

Lib/cmp.py

@@ -1,63 +0,0 @@
-"""Efficiently compare files, boolean outcome only (equal / not equal).
-
-Tricks (used in this order):
-    - 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
-
-cache = {}
-
-def cmp(f1, f2, shallow=1):
-    """Compare two files, use the cache if possible.
-    Return 1 for identical files, 0 for different.
-    Raise exceptions if either file could not be statted, read, etc."""
-    s1, s2 = sig(os.stat(f1)), sig(os.stat(f2))
-    if s1[0] <> 8 or s2[0] <> 8:
-        # 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)
-    try:
-        cs1, cs2, outcome = cache[key]
-        # cache hit
-        if s1 == cs1 and s2 == cs2:
-            # cached signatures match
-            return outcome
-        # stale cached signature(s)
-    except KeyError:
-        # cache miss
-        pass
-    # 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
-    0-5: st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid
-    6-9: st_size, st_atime, st_mtime, st_ctime"""
-    type = st[0] / 4096
-    size = st[6]
-    mtime = st[8]
-    return type, size, mtime
-
-def do_cmp(f1, f2):
-    """Compare two files, really."""
-    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