Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/Kubuntu 8.10/kubuntu-8.10-desktop-i386.iso/casper/filesystem.squashfs/usr/lib/python2.5/rfc822.pyc

Python Compiled Bytecode | 2008-10-29 | 31.2 KB | 1,157 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.5)

"""RFC 2822 message manipulation.

Note: This is only a very rough sketch of a full RFC-822 parser; in particular
the tokenizing of addresses does not adhere to all the quoting rules.

Note: RFC 2822 is a long awaited update to RFC 822.  This module should
conform to RFC 2822, and is thus mis-named (it's not worth renaming it).  Some
effort at RFC 2822 updates have been made, but a thorough audit has not been
performed.  Consider any RFC 2822 non-conformance to be a bug.

    RFC 2822: http://www.faqs.org/rfcs/rfc2822.html
    RFC 822 : http://www.faqs.org/rfcs/rfc822.html (obsolete)

Directions for use:

To create a Message object: first open a file, e.g.:

  fp = open(file, 'r')

You can use any other legal way of getting an open file object, e.g. use
sys.stdin or call os.popen().  Then pass the open file object to the Message()
constructor:

  m = Message(fp)

This class can work with any input object that supports a readline method.  If
the input object has seek and tell capability, the rewindbody method will
work; also illegal lines will be pushed back onto the input stream.  If the
input object lacks seek but has an `unread' method that can push back a line
of input, Message will use that to push back illegal lines.  Thus this class
can be used to parse messages coming from a buffered stream.

The optional `seekable' argument is provided as a workaround for certain stdio
libraries in which tell() discards buffered data before discovering that the
lseek() system call doesn't work.  For maximum portability, you should set the
seekable argument to zero to prevent that initial \\code{tell} when passing in
an unseekable object such as a a file object created from a socket object.  If
it is 1 on entry -- which it is by default -- the tell() method of the open
file object is called once; if this raises an exception, seekable is reset to
0.  For other nonzero values of seekable, this test is not made.

To get the text of a particular header there are several methods:

  str = m.getheader(name)
  str = m.getrawheader(name)

where name is the name of the header, e.g. 'Subject'.  The difference is that
getheader() strips the leading and trailing whitespace, while getrawheader()
doesn't.  Both functions retain embedded whitespace (including newlines)
exactly as they are specified in the header, and leave the case of the text
unchanged.

For addresses and address lists there are functions

  realname, mailaddress = m.getaddr(name)
  list = m.getaddrlist(name)

where the latter returns a list of (realname, mailaddr) tuples.

There is also a method

  time = m.getdate(name)

which parses a Date-like field and returns a time-compatible tuple,
i.e. a tuple such as returned by time.localtime() or accepted by
time.mktime().

See the class definition for lower level access methods.

There are also some utility functions here.
"""
import time
__all__ = [
    'Message',
    'AddressList',
    'parsedate',
    'parsedate_tz',
    'mktime_tz']
_blanklines = ('\r\n', '\n')

class Message:
    '''Represents a single RFC 2822-compliant message.'''

    def __init__(self, fp, seekable = 1):
        '''Initialize the class instance and read the headers.'''
        if seekable == 1:

            try:
                fp.tell()
            except (AttributeError, IOError):
                seekable = 0
            except:
                None<EXCEPTION MATCH>(AttributeError, IOError)


        None<EXCEPTION MATCH>(AttributeError, IOError)
        self.fp = fp
        self.seekable = seekable
        self.startofheaders = None
        self.startofbody = None
        if self.seekable:

            try:
                self.startofheaders = self.fp.tell()
            except IOError:
                self.seekable = 0
            except:
                None<EXCEPTION MATCH>IOError


        None<EXCEPTION MATCH>IOError
        self.readheaders()
        if self.seekable:

            try:
                self.startofbody = self.fp.tell()
            except IOError:
                self.seekable = 0
            except:
                None<EXCEPTION MATCH>IOError


        None<EXCEPTION MATCH>IOError


    def rewindbody(self):
        '''Rewind the file to the start of the body (if seekable).'''
        if not self.seekable:
            raise IOError, 'unseekable file'

        self.fp.seek(self.startofbody)


    def readheaders(self):
        '''Read header lines.

        Read header lines up to the entirely blank line that terminates them.
        The (normally blank) line that ends the headers is skipped, but not
        included in the returned list.  If a non-header line ends the headers,
        (which is an error), an attempt is made to backspace over it; it is
        never included in the returned list.

        The variable self.status is set to the empty string if all went well,
        otherwise it is an error message.  The variable self.headers is a
        completely uninterpreted list of lines contained in the header (so
        printing them will reproduce the header exactly as it appears in the
        file).
        '''
        self.dict = { }
        self.unixfrom = ''
        self.headers = lst = []
        self.status = ''
        headerseen = ''
        firstline = 1
        startofline = None
        unread = None
        tell = None
        if hasattr(self.fp, 'unread'):
            unread = self.fp.unread
        elif self.seekable:
            tell = self.fp.tell

        while tell:

            try:
                startofline = tell()
            except IOError:
                startofline = None
                tell = None
                self.seekable = 0
            except:
                None<EXCEPTION MATCH>IOError


            None<EXCEPTION MATCH>IOError
            line = self.fp.readline()
            if not line:
                self.status = 'EOF in headers'
                break

        if firstline and line.startswith('From '):
            self.unixfrom = self.unixfrom + line
            continue

        firstline = 0
        if headerseen and line[0] in ' \t':
            lst.append(line)
            x = self.dict[headerseen] + '\n ' + line.strip()
            self.dict[headerseen] = x.strip()
            continue
        elif self.iscomment(line):
            continue
        elif self.islast(line):
            break

        headerseen = self.isheader(line)
        if headerseen:
            lst.append(line)
            self.dict[headerseen] = line[len(headerseen) + 1:].strip()
            continue
            continue
        if not self.dict:
            self.status = 'No headers'
        else:
            self.status = 'Non-header line where header expected'
        if unread:
            unread(line)
        elif tell:
            self.fp.seek(startofline)
        else:
            self.status = self.status + '; bad seek'
        break
        continue


    def isheader(self, line):
        '''Determine whether a given line is a legal header.

        This method should return the header name, suitably canonicalized.
        You may override this method in order to use Message parsing on tagged
        data in RFC 2822-like formats with special header formats.
        '''
        i = line.find(':')
        if i > 0:
            return line[:i].lower()



    def islast(self, line):
        """Determine whether a line is a legal end of RFC 2822 headers.

        You may override this method if your application wants to bend the
        rules, e.g. to strip trailing whitespace, or to recognize MH template
        separators ('--------').  For convenience (e.g. for code reading from
        sockets) a line consisting of \r
 also matches.
        """
        return line in _blanklines


    def iscomment(self, line):
        '''Determine whether a line should be skipped entirely.

        You may override this method in order to use Message parsing on tagged
        data in RFC 2822-like formats that support embedded comments or
        free-text data.
        '''
        return False


    def getallmatchingheaders(self, name):
        '''Find all header lines matching a given header name.

        Look through the list of headers and find all lines matching a given
        header name (and their continuation lines).  A list of the lines is
        returned, without interpretation.  If the header does not occur, an
        empty list is returned.  If the header occurs multiple times, all
        occurrences are returned.  Case is not important in the header name.
        '''
        name = name.lower() + ':'
        n = len(name)
        lst = []
        hit = 0
        for line in self.headers:
            if line[:n].lower() == name:
                hit = 1
            elif not line[:1].isspace():
                hit = 0

            if hit:
                lst.append(line)
                continue

        return lst


    def getfirstmatchingheader(self, name):
        '''Get the first header line matching name.

        This is similar to getallmatchingheaders, but it returns only the
        first matching header (and its continuation lines).
        '''
        name = name.lower() + ':'
        n = len(name)
        lst = []
        hit = 0
        for line in self.headers:
            if hit:
                if not line[:1].isspace():
                    break

            elif line[:n].lower() == name:
                hit = 1

            if hit:
                lst.append(line)
                continue

        return lst


    def getrawheader(self, name):
        '''A higher-level interface to getfirstmatchingheader().

        Return a string containing the literal text of the header but with the
        keyword stripped.  All leading, trailing and embedded whitespace is
        kept in the string, however.  Return None if the header does not
        occur.
        '''
        lst = self.getfirstmatchingheader(name)
        if not lst:
            return None

        lst[0] = lst[0][len(name) + 1:]
        return ''.join(lst)


    def getheader(self, name, default = None):
        """Get the header value for a name.

        This is the normal interface: it returns a stripped version of the
        header value for a given header name, or None if it doesn't exist.
        This uses the dictionary version which finds the *last* such header.
        """
        return self.dict.get(name.lower(), default)

    get = getheader

    def getheaders(self, name):
        '''Get all values for a header.

        This returns a list of values for headers given more than once; each
        value in the result list is stripped in the same way as the result of
        getheader().  If the header is not given, return an empty list.
        '''
        result = []
        current = ''
        have_header = 0
        for s in self.getallmatchingheaders(name):
            if s[0].isspace():
                if current:
                    current = '%s\n %s' % (current, s.strip())
                else:
                    current = s.strip()
            current
            if have_header:
                result.append(current)

            current = s[s.find(':') + 1:].strip()
            have_header = 1

        if have_header:
            result.append(current)

        return result


    def getaddr(self, name):
        """Get a single address from a header, as a tuple.

        An example return value:
        ('Guido van Rossum', '[e-mail]')
        """
        alist = self.getaddrlist(name)
        if alist:
            return alist[0]
        else:
            return (None, None)


    def getaddrlist(self, name):
        '''Get a list of addresses from a header.

        Retrieves a list of addresses from a header, where each address is a
        tuple as returned by getaddr().  Scans all named headers, so it works
        properly with multiple To: or Cc: headers for example.
        '''
        raw = []
        for h in self.getallmatchingheaders(name):
            if h[0] in ' \t':
                raw.append(h)
                continue
            if raw:
                raw.append(', ')

            i = h.find(':')
            if i > 0:
                addr = h[i + 1:]

            raw.append(addr)

        alladdrs = ''.join(raw)
        a = AddressList(alladdrs)
        return a.addresslist


    def getdate(self, name):
        '''Retrieve a date field from a header.

        Retrieves a date field from the named header, returning a tuple
        compatible with time.mktime().
        '''

        try:
            data = self[name]
        except KeyError:
            return None

        return parsedate(data)


    def getdate_tz(self, name):
        """Retrieve a date field from a header as a 10-tuple.

        The first 9 elements make up a tuple compatible with time.mktime(),
        and the 10th is the offset of the poster's time zone from GMT/UTC.
        """

        try:
            data = self[name]
        except KeyError:
            return None

        return parsedate_tz(data)


    def __len__(self):
        '''Get the number of headers in a message.'''
        return len(self.dict)


    def __getitem__(self, name):
        '''Get a specific header, as from a dictionary.'''
        return self.dict[name.lower()]


    def __setitem__(self, name, value):
        '''Set the value of a header.

        Note: This is not a perfect inversion of __getitem__, because any
        changed headers get stuck at the end of the raw-headers list rather
        than where the altered header was.
        '''
        del self[name]
        self.dict[name.lower()] = value
        text = name + ': ' + value
        for line in text.split('\n'):
            self.headers.append(line + '\n')



    def __delitem__(self, name):
        '''Delete all occurrences of a specific header, if it is present.'''
        name = name.lower()
        if name not in self.dict:
            return None

        del self.dict[name]
        name = name + ':'
        n = len(name)
        lst = []
        hit = 0
        for i in range(len(self.headers)):
            line = self.headers[i]
            if line[:n].lower() == name:
                hit = 1
            elif not line[:1].isspace():
                hit = 0

            if hit:
                lst.append(i)
                continue

        for i in reversed(lst):
            del self.headers[i]



    def setdefault(self, name, default = ''):
        lowername = name.lower()
        if lowername in self.dict:
            return self.dict[lowername]
        else:
            text = name + ': ' + default
            for line in text.split('\n'):
                self.headers.append(line + '\n')

            self.dict[lowername] = default
            return default


    def has_key(self, name):
        '''Determine whether a message contains the named header.'''
        return name.lower() in self.dict


    def __contains__(self, name):
        '''Determine whether a message contains the named header.'''
        return name.lower() in self.dict


    def __iter__(self):
        return iter(self.dict)


    def keys(self):
        """Get all of a message's header field names."""
        return self.dict.keys()


    def values(self):
        """Get all of a message's header field values."""
        return self.dict.values()


    def items(self):
        """Get all of a message's headers.

        Returns a list of name, value tuples.
        """
        return self.dict.items()


    def __str__(self):
        return ''.join(self.headers)



def unquote(s):
    '''Remove quotes from a string.'''
    if len(s) > 1:
        if s.startswith('"') and s.endswith('"'):
            return s[1:-1].replace('\\\\', '\\').replace('\\"', '"')

        if s.startswith('<') and s.endswith('>'):
            return s[1:-1]


    return s


def quote(s):
    '''Add quotes around a string.'''
    return s.replace('\\', '\\\\').replace('"', '\\"')


def parseaddr(address):
    '''Parse an address into a (realname, mailaddr) tuple.'''
    a = AddressList(address)
    lst = a.addresslist
    if not lst:
        return (None, None)

    return lst[0]


class AddrlistClass:
    '''Address parser class by Ben Escoto.

    To understand what this class does, it helps to have a copy of
    RFC 2822 in front of you.

    http://www.faqs.org/rfcs/rfc2822.html

    Note: this class interface is deprecated and may be removed in the future.
    Use rfc822.AddressList instead.
    '''

    def __init__(self, field):
        """Initialize a new instance.

        `field' is an unparsed address header field, containing one or more
        addresses.
        """
        self.specials = '()<>@,:;."[]'
        self.pos = 0
        self.LWS = ' \t'
        self.CR = '\r\n'
        self.atomends = self.specials + self.LWS + self.CR
        self.phraseends = self.atomends.replace('.', '')
        self.field = field
        self.commentlist = []


    def gotonext(self):
        '''Parse up to the start of the next address.'''
        while self.pos < len(self.field):
            if self.field[self.pos] in self.LWS + '\n\r':
                self.pos = self.pos + 1
                continue
            if self.field[self.pos] == '(':
                self.commentlist.append(self.getcomment())
                continue
            break


    def getaddrlist(self):
        '''Parse all addresses.

        Returns a list containing all of the addresses.
        '''
        result = []
        ad = self.getaddress()
        while ad:
            result += ad
            ad = self.getaddress()
        return result


    def getaddress(self):
        '''Parse the next address.'''
        self.commentlist = []
        self.gotonext()
        oldpos = self.pos
        oldcl = self.commentlist
        plist = self.getphraselist()
        self.gotonext()
        returnlist = []
        if self.pos >= len(self.field):
            if plist:
                returnlist = [
                    (' '.join(self.commentlist), plist[0])]

        elif self.field[self.pos] in '.@':
            self.pos = oldpos
            self.commentlist = oldcl
            addrspec = self.getaddrspec()
            returnlist = [
                (' '.join(self.commentlist), addrspec)]
        elif self.field[self.pos] == ':':
            returnlist = []
            fieldlen = len(self.field)
            self.pos += 1
            while self.pos < len(self.field):
                self.gotonext()
                returnlist = returnlist + self.getaddress()
                continue
                None if self.pos < fieldlen and self.field[self.pos] == ';' else self
        elif self.field[self.pos] == '<':
            routeaddr = self.getrouteaddr()
            if self.commentlist:
                returnlist = [
                    (' '.join(plist) + ' (' + ' '.join(self.commentlist) + ')', routeaddr)]
            else:
                returnlist = [
                    (' '.join(plist), routeaddr)]
        elif plist:
            returnlist = [
                (' '.join(self.commentlist), plist[0])]
        elif self.field[self.pos] in self.specials:
            self.pos += 1

        self.gotonext()
        if self.pos < len(self.field) and self.field[self.pos] == ',':
            self.pos += 1

        return returnlist


    def getrouteaddr(self):
        '''Parse a route address (Return-path value).

        This method just skips all the route stuff and returns the addrspec.
        '''
        if self.field[self.pos] != '<':
            return None

        expectroute = 0
        self.pos += 1
        self.gotonext()
        adlist = ''
        while self.pos < len(self.field):
            if expectroute:
                self.getdomain()
                expectroute = 0
            elif self.field[self.pos] == '>':
                self.pos += 1
                break
            elif self.field[self.pos] == '@':
                self.pos += 1
                expectroute = 1
            elif self.field[self.pos] == ':':
                self.pos += 1
            else:
                adlist = self.getaddrspec()
                self.pos += 1
                break
            self.gotonext()
            continue
            self
        return adlist


    def getaddrspec(self):
        '''Parse an RFC 2822 addr-spec.'''
        aslist = []
        self.gotonext()
        while self.pos < len(self.field):
            if self.field[self.pos] == '.':
                aslist.append('.')
                self.pos += 1
            elif self.field[self.pos] == '"':
                aslist.append('"%s"' % self.getquote())
            elif self.field[self.pos] in self.atomends:
                break
            else:
                aslist.append(self.getatom())
            self.gotonext()
        if self.pos >= len(self.field) or self.field[self.pos] != '@':
            return ''.join(aslist)

        aslist.append('@')
        self.pos += 1
        self.gotonext()
        return ''.join(aslist) + self.getdomain()


    def getdomain(self):
        '''Get the complete domain name from an address.'''
        sdlist = []
        while self.pos < len(self.field):
            if self.field[self.pos] in self.LWS:
                self.pos += 1
                continue
            self
            if self.field[self.pos] == '(':
                self.commentlist.append(self.getcomment())
                continue
            if self.field[self.pos] == '[':
                sdlist.append(self.getdomainliteral())
                continue
            if self.field[self.pos] == '.':
                self.pos += 1
                sdlist.append('.')
                continue
            self
            if self.field[self.pos] in self.atomends:
                break
                continue
            sdlist.append(self.getatom())
        return ''.join(sdlist)


    def getdelimited(self, beginchar, endchars, allowcomments = 1):
        """Parse a header fragment delimited by special characters.

        `beginchar' is the start character for the fragment.  If self is not
        looking at an instance of `beginchar' then getdelimited returns the
        empty string.

        `endchars' is a sequence of allowable end-delimiting characters.
        Parsing stops when one of these is encountered.

        If `allowcomments' is non-zero, embedded RFC 2822 comments are allowed
        within the parsed fragment.
        """
        if self.field[self.pos] != beginchar:
            return ''

        slist = [
            '']
        quote = 0
        self.pos += 1
        while self.pos < len(self.field):
            if quote == 1:
                slist.append(self.field[self.pos])
                quote = 0
            elif self.field[self.pos] in endchars:
                self.pos += 1
                break
            elif allowcomments and self.field[self.pos] == '(':
                slist.append(self.getcomment())
                continue
            elif self.field[self.pos] == '\\':
                quote = 1
            else:
                slist.append(self.field[self.pos])
            self.pos += 1
            continue
            self
        return ''.join(slist)


    def getquote(self):
        """Get a quote-delimited fragment from self's field."""
        return self.getdelimited('"', '"\r', 0)


    def getcomment(self):
        """Get a parenthesis-delimited fragment from self's field."""
        return self.getdelimited('(', ')\r', 1)


    def getdomainliteral(self):
        '''Parse an RFC 2822 domain-literal.'''
        return '[%s]' % self.getdelimited('[', ']\r', 0)


    def getatom(self, atomends = None):
        """Parse an RFC 2822 atom.

        Optional atomends specifies a different set of end token delimiters
        (the default is to use self.atomends).  This is used e.g. in
        getphraselist() since phrase endings must not include the `.' (which
        is legal in phrases)."""
        atomlist = [
            '']
        if atomends is None:
            atomends = self.atomends

        while self.pos < len(self.field):
            if self.field[self.pos] in atomends:
                break
            else:
                atomlist.append(self.field[self.pos])
            self.pos += 1
            continue
            self
        return ''.join(atomlist)


    def getphraselist(self):
        '''Parse a sequence of RFC 2822 phrases.

        A phrase is a sequence of words, which are in turn either RFC 2822
        atoms or quoted-strings.  Phrases are canonicalized by squeezing all
        runs of continuous whitespace into one space.
        '''
        plist = []
        while self.pos < len(self.field):
            if self.field[self.pos] in self.LWS:
                self.pos += 1
                continue
            self
            if self.field[self.pos] == '"':
                plist.append(self.getquote())
                continue
            if self.field[self.pos] == '(':
                self.commentlist.append(self.getcomment())
                continue
            if self.field[self.pos] in self.phraseends:
                break
                continue
            plist.append(self.getatom(self.phraseends))
        return plist



class AddressList(AddrlistClass):
    '''An AddressList encapsulates a list of parsed RFC 2822 addresses.'''

    def __init__(self, field):
        AddrlistClass.__init__(self, field)
        if field:
            self.addresslist = self.getaddrlist()
        else:
            self.addresslist = []


    def __len__(self):
        return len(self.addresslist)


    def __str__(self):
        return ', '.join(map(dump_address_pair, self.addresslist))


    def __add__(self, other):
        newaddr = AddressList(None)
        newaddr.addresslist = self.addresslist[:]
        for x in other.addresslist:
            if x not in self.addresslist:
                newaddr.addresslist.append(x)
                continue

        return newaddr


    def __iadd__(self, other):
        for x in other.addresslist:
            if x not in self.addresslist:
                self.addresslist.append(x)
                continue

        return self


    def __sub__(self, other):
        newaddr = AddressList(None)
        for x in self.addresslist:
            if x not in other.addresslist:
                newaddr.addresslist.append(x)
                continue

        return newaddr


    def __isub__(self, other):
        for x in other.addresslist:
            if x in self.addresslist:
                self.addresslist.remove(x)
                continue

        return self


    def __getitem__(self, index):
        return self.addresslist[index]



def dump_address_pair(pair):
    '''Dump a (name, address) pair in a canonicalized form.'''
    if pair[0]:
        return '"' + pair[0] + '" <' + pair[1] + '>'
    else:
        return pair[1]

_monthnames = [
    'jan',
    'feb',
    'mar',
    'apr',
    'may',
    'jun',
    'jul',
    'aug',
    'sep',
    'oct',
    'nov',
    'dec',
    'january',
    'february',
    'march',
    'april',
    'may',
    'june',
    'july',
    'august',
    'september',
    'october',
    'november',
    'december']
_daynames = [
    'mon',
    'tue',
    'wed',
    'thu',
    'fri',
    'sat',
    'sun']
_timezones = {
    'UT': 0,
    'UTC': 0,
    'GMT': 0,
    'Z': 0,
    'AST': -400,
    'ADT': -300,
    'EST': -500,
    'EDT': -400,
    'CST': -600,
    'CDT': -500,
    'MST': -700,
    'MDT': -600,
    'PST': -800,
    'PDT': -700 }

def parsedate_tz(data):
    '''Convert a date string to a time tuple.

    Accounts for military timezones.
    '''
    if not data:
        return None

    data = data.split()
    if data[0][-1] in (',', '.') or data[0].lower() in _daynames:
        del data[0]
    else:
        i = data[0].rfind(',')
        if i >= 0:
            data[0] = data[0][i + 1:]

    if len(data) == 3:
        stuff = data[0].split('-')
        if len(stuff) == 3:
            data = stuff + data[1:]


    if len(data) == 4:
        s = data[3]
        i = s.find('+')
        if i > 0:
            data[3:] = [
                s[:i],
                s[i + 1:]]
        else:
            data.append('')

    if len(data) < 5:
        return None

    data = data[:5]
    (dd, mm, yy, tm, tz) = data
    mm = mm.lower()
    if mm not in _monthnames:
        dd = mm
        mm = dd.lower()
        if mm not in _monthnames:
            return None


    mm = _monthnames.index(mm) + 1
    if mm > 12:
        mm = mm - 12

    if dd[-1] == ',':
        dd = dd[:-1]

    i = yy.find(':')
    if i > 0:
        yy = tm
        tm = yy

    if yy[-1] == ',':
        yy = yy[:-1]

    if not yy[0].isdigit():
        yy = tz
        tz = yy

    if tm[-1] == ',':
        tm = tm[:-1]

    tm = tm.split(':')
    if len(tm) == 2:
        (thh, tmm) = tm
        tss = '0'
    elif len(tm) == 3:
        (thh, tmm, tss) = tm
    else:
        return None

    try:
        yy = int(yy)
        dd = int(dd)
        thh = int(thh)
        tmm = int(tmm)
        tss = int(tss)
    except ValueError:
        return None

    tzoffset = None
    tz = tz.upper()
    if tz in _timezones:
        tzoffset = _timezones[tz]
    else:

        try:
            tzoffset = int(tz)
        except ValueError:
            pass

    if tzoffset:
        if tzoffset < 0:
            tzsign = -1
            tzoffset = -tzoffset
        else:
            tzsign = 1
        tzoffset = tzsign * ((tzoffset // 100) * 3600 + (tzoffset % 100) * 60)

    return (yy, mm, dd, thh, tmm, tss, 0, 1, 0, tzoffset)


def parsedate(data):
    '''Convert a time string to a time tuple.'''
    t = parsedate_tz(data)
    if t is None:
        return t

    return t[:9]


def mktime_tz(data):
    '''Turn a 10-tuple as returned by parsedate_tz() into a UTC timestamp.'''
    if data[9] is None:
        return time.mktime(data[:8] + (-1,))
    else:
        t = time.mktime(data[:8] + (0,))
        return t - data[9] - time.timezone


def formatdate(timeval = None):
    """Returns time format preferred for Internet standards.

    Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 822, updated by RFC 1123

    According to RFC 1123, day and month names must always be in
    English.  If not for that, this code could use strftime().  It
    can't because strftime() honors the locale and could generated
    non-English names.
    """
    if timeval is None:
        timeval = time.time()

    timeval = time.gmtime(timeval)
    return '%s, %02d %s %04d %02d:%02d:%02d GMT' % (('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')[timeval[6]], timeval[2], ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec')[timeval[1] - 1], timeval[0], timeval[3], timeval[4], timeval[5])

if __name__ == '__main__':
    import sys
    import os
    file = os.path.join(os.environ['HOME'], 'Mail/inbox/1')
    if sys.argv[1:]:
        file = sys.argv[1]

    f = open(file, 'r')
    m = Message(f)
    print 'From:', m.getaddr('from')
    print 'To:', m.getaddrlist('to')
    print 'Subject:', m.getheader('subject')
    print 'Date:', m.getheader('date')
    date = m.getdate_tz('date')
    tz = date[-1]
    date = time.localtime(mktime_tz(date))
    if date:
        print 'ParsedDate:', time.asctime(date),
        hhmmss = tz
        (hhmm, ss) = divmod(hhmmss, 60)
        (hh, mm) = divmod(hhmm, 60)
        print '%+03d%02d' % (hh, mm),
        if ss:
            print '.%02d' % ss,

        print
    else:
        print 'ParsedDate:', None
    m.rewindbody()
    n = 0
    while f.readline():
        n += 1
    print 'Lines:', n
    print '-' * 70
    print 'len =', len(m)
    if 'Date' in m:
        print 'Date =', m['Date']

    if 'X-Nonsense' in m:
        pass

    print 'keys =', m.keys()
    print 'values =', m.values()
    print 'items =', m.items()