Add Py3 helpers to common.py

paramiko/common.py

@@ -19,6 +19,7 @@
 """
 Common constants and global variables.
 """
+from paramiko.py3compat import *
 
 MSG_DISCONNECT, MSG_IGNORE, MSG_UNIMPLEMENTED, MSG_DEBUG, MSG_SERVICE_REQUEST, \
     MSG_SERVICE_ACCEPT = range(1, 7)
@@ -33,6 +34,10 @@ MSG_CHANNEL_OPEN, MSG_CHANNEL_OPEN_SUCCESS, MSG_CHANNEL_OPEN_FAILURE, \
     MSG_CHANNEL_EOF, MSG_CHANNEL_CLOSE, MSG_CHANNEL_REQUEST, \
     MSG_CHANNEL_SUCCESS, MSG_CHANNEL_FAILURE = range(90, 101)
 
+for key in list(globals().keys()):
+    if key.startswith('MSG_'):
+        globals()['c' + key] = byte_chr(globals()[key])
+del key
 
 # for debugging:
 MSG_NAMES = {
@@ -69,7 +74,7 @@ MSG_NAMES = {
     MSG_CHANNEL_REQUEST: 'channel-request',
     MSG_CHANNEL_SUCCESS: 'channel-success',
     MSG_CHANNEL_FAILURE: 'channel-failure'
-    }
+}
 
 
 # authentication request return codes:
@@ -118,6 +123,44 @@ else:
     import logging
     PY22 = False
 
+if PY3:
+    zero_byte = b'\x00'
+    one_byte = b'\x01'
+    four_byte = b'\x04'
+    max_byte = b'\xff'
+    newline_byte = b'\n'
+    cr_byte = b'\r'
+else:
+    zero_byte = '\x00'
+    one_byte = '\x01'
+    four_byte = '\x04'
+    max_byte = '\xff'
+    newline_byte = '\n'
+    cr_byte = '\r'
+
+
+def asbytes(s):
+    if not isinstance(s, bytes_type):
+        if isinstance(s, string_types):
+            s = b(s)
+        else:
+            try:
+                s = s.asbytes()
+            except Exception:
+                raise Exception('Unknown type')
+    return s
+
+xffffffff = long(0xffffffff)
+x80000000 = long(0x80000000)
+long_zero = long(0)
+long_one = long(1)
+o666 = 438
+o660 = 432
+o644 = 420
+o600 = 384
+o777 = 511
+o700 = 448
+o70 = 56
 
 DEBUG = logging.DEBUG
 INFO = logging.INFO