/usr/share/pyshared/subvertpy/marshall.py is in python-subvertpy 0.9.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | # Copyright (C) 2006-2007 Jelmer Vernooij <jelmer@samba.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
"""Marshalling for the svn_ra protocol."""
class literal:
"""A protocol literal."""
def __init__(self, txt):
self.txt = txt
def __str__(self):
return self.txt
def __repr__(self):
return self.txt
# 1. Syntactic structure
# ----------------------
#
# The Subversion protocol is specified in terms of the following
# syntactic elements, specified using ABNF [RFC 2234]:
#
# item = word / number / string / list
# word = ALPHA *(ALPHA / DIGIT / "-") space
# number = 1*DIGIT space
# string = 1*DIGIT ":" *OCTET space
# ; digits give the byte count of the *OCTET portion
# list = "(" space *item ")" space
# space = 1*(SP / LF)
#
class MarshallError(Exception):
"""A Marshall error."""
class NeedMoreData(MarshallError):
"""More data needed."""
def marshall(x):
"""Marshall a Python data item.
:param x: Data item
:return: encoded string
"""
if type(x) is int:
return "%d " % x
elif type(x) is list or type(x) is tuple:
return "( " + "".join(map(marshall, x)) + ") "
elif isinstance(x, literal):
return "%s " % x
elif type(x) is str:
return "%d:%s " % (len(x), x)
elif type(x) is unicode:
return "%d:%s " % (len(x), x.encode("utf-8"))
elif type(x) is bool:
if x == True:
return "true "
elif x == False:
return "false "
raise MarshallError("Unable to marshall type %s" % x)
def unmarshall(x):
"""Unmarshall the next item from a text.
:param x: Text to parse
:return: tuple with unpacked item and remaining text
"""
whitespace = ['\n', ' ']
if len(x) == 0:
raise NeedMoreData("Not enough data")
if x[0] == "(": # list follows
if len(x) <= 1:
raise NeedMoreData("Missing whitespace")
if x[1] != " ":
raise MarshallError("missing whitespace after list start")
x = x[2:]
ret = []
try:
while x[0] != ")":
(x, n) = unmarshall(x)
ret.append(n)
except IndexError:
raise NeedMoreData("List not terminated")
if len(x) <= 1:
raise NeedMoreData("Missing whitespace")
if not x[1] in whitespace:
raise MarshallError("Expected space, got %c" % x[1])
return (x[2:], ret)
elif x[0].isdigit():
num = ""
# Check if this is a string or a number
while x[0].isdigit():
num += x[0]
x = x[1:]
num = int(num)
if x[0] in whitespace:
return (x[1:], num)
elif x[0] == ":":
if len(x) < num:
raise NeedMoreData("Expected string of length %r" % num)
return (x[num+2:], x[1:num+1])
else:
raise MarshallError("Expected whitespace or ':', got '%c" % x[0])
elif x[0].isalpha():
ret = ""
# Parse literal
try:
while x[0].isalpha() or x[0].isdigit() or x[0] == '-':
ret += x[0]
x = x[1:]
except IndexError:
raise NeedMoreData("Expected literal")
if not x[0] in whitespace:
raise MarshallError("Expected whitespace, got %c" % x[0])
return (x[1:], ret)
else:
raise MarshallError("Unexpected character '%c'" % x[0])
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