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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">#! /usr/libexec/platform-python

&quot;&quot;&quot;Base16, Base32, Base64 (RFC 3548), Base85 and Ascii85 data encodings&quot;&quot;&quot;

# Modified 04-Oct-1995 by Jack Jansen to use binascii module
# Modified 30-Dec-2003 by Barry Warsaw to add full RFC 3548 support
# Modified 22-May-2007 by Guido van Rossum to use bytes everywhere

import re
import struct
import binascii


__all__ = [
    # Legacy interface exports traditional RFC 2045 Base64 encodings
    &#039;encode&#039;, &#039;decode&#039;, &#039;encodebytes&#039;, &#039;decodebytes&#039;,
    # Generalized interface for other encodings
    &#039;b64encode&#039;, &#039;b64decode&#039;, &#039;b32encode&#039;, &#039;b32decode&#039;,
    &#039;b16encode&#039;, &#039;b16decode&#039;,
    # Base85 and Ascii85 encodings
    &#039;b85encode&#039;, &#039;b85decode&#039;, &#039;a85encode&#039;, &#039;a85decode&#039;,
    # Standard Base64 encoding
    &#039;standard_b64encode&#039;, &#039;standard_b64decode&#039;,
    # Some common Base64 alternatives.  As referenced by RFC 3458, see thread
    # starting at:
    #
    # http://zgp.org/pipermail/p2p-hackers/2001-September/000316.html
    &#039;urlsafe_b64encode&#039;, &#039;urlsafe_b64decode&#039;,
    ]


bytes_types = (bytes, bytearray)  # Types acceptable as binary data

def _bytes_from_decode_data(s):
    if isinstance(s, str):
        try:
            return s.encode(&#039;ascii&#039;)
        except UnicodeEncodeError:
            raise ValueError(&#039;string argument should contain only ASCII characters&#039;)
    if isinstance(s, bytes_types):
        return s
    try:
        return memoryview(s).tobytes()
    except TypeError:
        raise TypeError(&quot;argument should be a bytes-like object or ASCII &quot;
                        &quot;string, not %r&quot; % s.__class__.__name__) from None


# Base64 encoding/decoding uses binascii

def b64encode(s, altchars=None):
    &quot;&quot;&quot;Encode the bytes-like object s using Base64 and return a bytes object.

    Optional altchars should be a byte string of length 2 which specifies an
    alternative alphabet for the &#039;+&#039; and &#039;/&#039; characters.  This allows an
    application to e.g. generate url or filesystem safe Base64 strings.
    &quot;&quot;&quot;
    encoded = binascii.b2a_base64(s, newline=False)
    if altchars is not None:
        assert len(altchars) == 2, repr(altchars)
        return encoded.translate(bytes.maketrans(b&#039;+/&#039;, altchars))
    return encoded


def b64decode(s, altchars=None, validate=False):
    &quot;&quot;&quot;Decode the Base64 encoded bytes-like object or ASCII string s.

    Optional altchars must be a bytes-like object or ASCII string of length 2
    which specifies the alternative alphabet used instead of the &#039;+&#039; and &#039;/&#039;
    characters.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded.

    If validate is False (the default), characters that are neither in the
    normal base-64 alphabet nor the alternative alphabet are discarded prior
    to the padding check.  If validate is True, these non-alphabet characters
    in the input result in a binascii.Error.
    &quot;&quot;&quot;
    s = _bytes_from_decode_data(s)
    if altchars is not None:
        altchars = _bytes_from_decode_data(altchars)
        assert len(altchars) == 2, repr(altchars)
        s = s.translate(bytes.maketrans(altchars, b&#039;+/&#039;))
    if validate and not re.match(b&#039;^[A-Za-z0-9+/]*={0,2}$&#039;, s):
        raise binascii.Error(&#039;Non-base64 digit found&#039;)
    return binascii.a2b_base64(s)


def standard_b64encode(s):
    &quot;&quot;&quot;Encode bytes-like object s using the standard Base64 alphabet.

    The result is returned as a bytes object.
    &quot;&quot;&quot;
    return b64encode(s)

def standard_b64decode(s):
    &quot;&quot;&quot;Decode bytes encoded with the standard Base64 alphabet.

    Argument s is a bytes-like object or ASCII string to decode.  The result
    is returned as a bytes object.  A binascii.Error is raised if the input
    is incorrectly padded.  Characters that are not in the standard alphabet
    are discarded prior to the padding check.
    &quot;&quot;&quot;
    return b64decode(s)


_urlsafe_encode_translation = bytes.maketrans(b&#039;+/&#039;, b&#039;-_&#039;)
_urlsafe_decode_translation = bytes.maketrans(b&#039;-_&#039;, b&#039;+/&#039;)

def urlsafe_b64encode(s):
    &quot;&quot;&quot;Encode bytes using the URL- and filesystem-safe Base64 alphabet.

    Argument s is a bytes-like object to encode.  The result is returned as a
    bytes object.  The alphabet uses &#039;-&#039; instead of &#039;+&#039; and &#039;_&#039; instead of
    &#039;/&#039;.
    &quot;&quot;&quot;
    return b64encode(s).translate(_urlsafe_encode_translation)

def urlsafe_b64decode(s):
    &quot;&quot;&quot;Decode bytes using the URL- and filesystem-safe Base64 alphabet.

    Argument s is a bytes-like object or ASCII string to decode.  The result
    is returned as a bytes object.  A binascii.Error is raised if the input
    is incorrectly padded.  Characters that are not in the URL-safe base-64
    alphabet, and are not a plus &#039;+&#039; or slash &#039;/&#039;, are discarded prior to the
    padding check.

    The alphabet uses &#039;-&#039; instead of &#039;+&#039; and &#039;_&#039; instead of &#039;/&#039;.
    &quot;&quot;&quot;
    s = _bytes_from_decode_data(s)
    s = s.translate(_urlsafe_decode_translation)
    return b64decode(s)


# Base32 encoding/decoding must be done in Python
_b32alphabet = b&#039;ABCDEFGHIJKLMNOPQRSTUVWXYZ234567&#039;
_b32tab2 = None
_b32rev = None

def b32encode(s):
    &quot;&quot;&quot;Encode the bytes-like object s using Base32 and return a bytes object.
    &quot;&quot;&quot;
    global _b32tab2
    # Delay the initialization of the table to not waste memory
    # if the function is never called
    if _b32tab2 is None:
        b32tab = [bytes((i,)) for i in _b32alphabet]
        _b32tab2 = [a + b for a in b32tab for b in b32tab]
        b32tab = None

    if not isinstance(s, bytes_types):
        s = memoryview(s).tobytes()
    leftover = len(s) % 5
    # Pad the last quantum with zero bits if necessary
    if leftover:
        s = s + b&#039;\0&#039; * (5 - leftover)  # Don&#039;t use += !
    encoded = bytearray()
    from_bytes = int.from_bytes
    b32tab2 = _b32tab2
    for i in range(0, len(s), 5):
        c = from_bytes(s[i: i + 5], &#039;big&#039;)
        encoded += (b32tab2[c &gt;&gt; 30] +           # bits 1 - 10
                    b32tab2[(c &gt;&gt; 20) &amp; 0x3ff] + # bits 11 - 20
                    b32tab2[(c &gt;&gt; 10) &amp; 0x3ff] + # bits 21 - 30
                    b32tab2[c &amp; 0x3ff]           # bits 31 - 40
                   )
    # Adjust for any leftover partial quanta
    if leftover == 1:
        encoded[-6:] = b&#039;======&#039;
    elif leftover == 2:
        encoded[-4:] = b&#039;====&#039;
    elif leftover == 3:
        encoded[-3:] = b&#039;===&#039;
    elif leftover == 4:
        encoded[-1:] = b&#039;=&#039;
    return bytes(encoded)

def b32decode(s, casefold=False, map01=None):
    &quot;&quot;&quot;Decode the Base32 encoded bytes-like object or ASCII string s.

    Optional casefold is a flag specifying whether a lowercase alphabet is
    acceptable as input.  For security purposes, the default is False.

    RFC 3548 allows for optional mapping of the digit 0 (zero) to the
    letter O (oh), and for optional mapping of the digit 1 (one) to
    either the letter I (eye) or letter L (el).  The optional argument
    map01 when not None, specifies which letter the digit 1 should be
    mapped to (when map01 is not None, the digit 0 is always mapped to
    the letter O).  For security purposes the default is None, so that
    0 and 1 are not allowed in the input.

    The result is returned as a bytes object.  A binascii.Error is raised if
    the input is incorrectly padded or if there are non-alphabet
    characters present in the input.
    &quot;&quot;&quot;
    global _b32rev
    # Delay the initialization of the table to not waste memory
    # if the function is never called
    if _b32rev is None:
        _b32rev = {v: k for k, v in enumerate(_b32alphabet)}
    s = _bytes_from_decode_data(s)
    if len(s) % 8:
        raise binascii.Error(&#039;Incorrect padding&#039;)
    # Handle section 2.4 zero and one mapping.  The flag map01 will be either
    # False, or the character to map the digit 1 (one) to.  It should be
    # either L (el) or I (eye).
    if map01 is not None:
        map01 = _bytes_from_decode_data(map01)
        assert len(map01) == 1, repr(map01)
        s = s.translate(bytes.maketrans(b&#039;01&#039;, b&#039;O&#039; + map01))
    if casefold:
        s = s.upper()
    # Strip off pad characters from the right.  We need to count the pad
    # characters because this will tell us how many null bytes to remove from
    # the end of the decoded string.
    l = len(s)
    s = s.rstrip(b&#039;=&#039;)
    padchars = l - len(s)
    # Now decode the full quanta
    decoded = bytearray()
    b32rev = _b32rev
    for i in range(0, len(s), 8):
        quanta = s[i: i + 8]
        acc = 0
        try:
            for c in quanta:
                acc = (acc &lt;&lt; 5) + b32rev[c]
        except KeyError:
            raise binascii.Error(&#039;Non-base32 digit found&#039;) from None
        decoded += acc.to_bytes(5, &#039;big&#039;)
    # Process the last, partial quanta
    if l % 8 or padchars not in {0, 1, 3, 4, 6}:
        raise binascii.Error(&#039;Incorrect padding&#039;)
    if padchars and decoded:
        acc &lt;&lt;= 5 * padchars
        last = acc.to_bytes(5, &#039;big&#039;)
        leftover = (43 - 5 * padchars) // 8  # 1: 4, 3: 3, 4: 2, 6: 1
        decoded[-5:] = last[:leftover]
    return bytes(decoded)


# RFC 3548, Base 16 Alphabet specifies uppercase, but hexlify() returns
# lowercase.  The RFC also recommends against accepting input case
# insensitively.
def b16encode(s):
    &quot;&quot;&quot;Encode the bytes-like object s using Base16 and return a bytes object.
    &quot;&quot;&quot;
    return binascii.hexlify(s).upper()


def b16decode(s, casefold=False):
    &quot;&quot;&quot;Decode the Base16 encoded bytes-like object or ASCII string s.

    Optional casefold is a flag specifying whether a lowercase alphabet is
    acceptable as input.  For security purposes, the default is False.

    The result is returned as a bytes object.  A binascii.Error is raised if
    s is incorrectly padded or if there are non-alphabet characters present
    in the input.
    &quot;&quot;&quot;
    s = _bytes_from_decode_data(s)
    if casefold:
        s = s.upper()
    if re.search(b&#039;[^0-9A-F]&#039;, s):
        raise binascii.Error(&#039;Non-base16 digit found&#039;)
    return binascii.unhexlify(s)

#
# Ascii85 encoding/decoding
#

_a85chars = None
_a85chars2 = None
_A85START = b&quot;&lt;~&quot;
_A85END = b&quot;~&gt;&quot;

def _85encode(b, chars, chars2, pad=False, foldnuls=False, foldspaces=False):
    # Helper function for a85encode and b85encode
    if not isinstance(b, bytes_types):
        b = memoryview(b).tobytes()

    padding = (-len(b)) % 4
    if padding:
        b = b + b&#039;\0&#039; * padding
    words = struct.Struct(&#039;!%dI&#039; % (len(b) // 4)).unpack(b)

    chunks = [b&#039;z&#039; if foldnuls and not word else
              b&#039;y&#039; if foldspaces and word == 0x20202020 else
              (chars2[word // 614125] +
               chars2[word // 85 % 7225] +
               chars[word % 85])
              for word in words]

    if padding and not pad:
        if chunks[-1] == b&#039;z&#039;:
            chunks[-1] = chars[0] * 5
        chunks[-1] = chunks[-1][:-padding]

    return b&#039;&#039;.join(chunks)

def a85encode(b, *, foldspaces=False, wrapcol=0, pad=False, adobe=False):
    &quot;&quot;&quot;Encode bytes-like object b using Ascii85 and return a bytes object.

    foldspaces is an optional flag that uses the special short sequence &#039;y&#039;
    instead of 4 consecutive spaces (ASCII 0x20) as supported by &#039;btoa&#039;. This
    feature is not supported by the &quot;standard&quot; Adobe encoding.

    wrapcol controls whether the output should have newline (b&#039;\\n&#039;) characters
    added to it. If this is non-zero, each output line will be at most this
    many characters long.

    pad controls whether the input is padded to a multiple of 4 before
    encoding. Note that the btoa implementation always pads.

    adobe controls whether the encoded byte sequence is framed with &lt;~ and ~&gt;,
    which is used by the Adobe implementation.
    &quot;&quot;&quot;
    global _a85chars, _a85chars2
    # Delay the initialization of tables to not waste memory
    # if the function is never called
    if _a85chars is None:
        _a85chars = [bytes((i,)) for i in range(33, 118)]
        _a85chars2 = [(a + b) for a in _a85chars for b in _a85chars]

    result = _85encode(b, _a85chars, _a85chars2, pad, True, foldspaces)

    if adobe:
        result = _A85START + result
    if wrapcol:
        wrapcol = max(2 if adobe else 1, wrapcol)
        chunks = [result[i: i + wrapcol]
                  for i in range(0, len(result), wrapcol)]
        if adobe:
            if len(chunks[-1]) + 2 &gt; wrapcol:
                chunks.append(b&#039;&#039;)
        result = b&#039;\n&#039;.join(chunks)
    if adobe:
        result += _A85END

    return result

def a85decode(b, *, foldspaces=False, adobe=False, ignorechars=b&#039; \t\n\r\v&#039;):
    &quot;&quot;&quot;Decode the Ascii85 encoded bytes-like object or ASCII string b.

    foldspaces is a flag that specifies whether the &#039;y&#039; short sequence should be
    accepted as shorthand for 4 consecutive spaces (ASCII 0x20). This feature is
    not supported by the &quot;standard&quot; Adobe encoding.

    adobe controls whether the input sequence is in Adobe Ascii85 format (i.e.
    is framed with &lt;~ and ~&gt;).

    ignorechars should be a byte string containing characters to ignore from the
    input. This should only contain whitespace characters, and by default
    contains all whitespace characters in ASCII.

    The result is returned as a bytes object.
    &quot;&quot;&quot;
    b = _bytes_from_decode_data(b)
    if adobe:
        if not b.endswith(_A85END):
            raise ValueError(
                &quot;Ascii85 encoded byte sequences must end &quot;
                &quot;with {!r}&quot;.format(_A85END)
                )
        if b.startswith(_A85START):
            b = b[2:-2]  # Strip off start/end markers
        else:
            b = b[:-2]
    #
    # We have to go through this stepwise, so as to ignore spaces and handle
    # special short sequences
    #
    packI = struct.Struct(&#039;!I&#039;).pack
    decoded = []
    decoded_append = decoded.append
    curr = []
    curr_append = curr.append
    curr_clear = curr.clear
    for x in b + b&#039;u&#039; * 4:
        if b&#039;!&#039;[0] &lt;= x &lt;= b&#039;u&#039;[0]:
            curr_append(x)
            if len(curr) == 5:
                acc = 0
                for x in curr:
                    acc = 85 * acc + (x - 33)
                try:
                    decoded_append(packI(acc))
                except struct.error:
                    raise ValueError(&#039;Ascii85 overflow&#039;) from None
                curr_clear()
        elif x == b&#039;z&#039;[0]:
            if curr:
                raise ValueError(&#039;z inside Ascii85 5-tuple&#039;)
            decoded_append(b&#039;\0\0\0\0&#039;)
        elif foldspaces and x == b&#039;y&#039;[0]:
            if curr:
                raise ValueError(&#039;y inside Ascii85 5-tuple&#039;)
            decoded_append(b&#039;\x20\x20\x20\x20&#039;)
        elif x in ignorechars:
            # Skip whitespace
            continue
        else:
            raise ValueError(&#039;Non-Ascii85 digit found: %c&#039; % x)

    result = b&#039;&#039;.join(decoded)
    padding = 4 - len(curr)
    if padding:
        # Throw away the extra padding
        result = result[:-padding]
    return result

# The following code is originally taken (with permission) from Mercurial

_b85alphabet = (b&quot;0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ&quot;
                b&quot;abcdefghijklmnopqrstuvwxyz!#$%&amp;()*+-;&lt;=&gt;?@^_`{|}~&quot;)
_b85chars = None
_b85chars2 = None
_b85dec = None

def b85encode(b, pad=False):
    &quot;&quot;&quot;Encode bytes-like object b in base85 format and return a bytes object.

    If pad is true, the input is padded with b&#039;\\0&#039; so its length is a multiple of
    4 bytes before encoding.
    &quot;&quot;&quot;
    global _b85chars, _b85chars2
    # Delay the initialization of tables to not waste memory
    # if the function is never called
    if _b85chars is None:
        _b85chars = [bytes((i,)) for i in _b85alphabet]
        _b85chars2 = [(a + b) for a in _b85chars for b in _b85chars]
    return _85encode(b, _b85chars, _b85chars2, pad)

def b85decode(b):
    &quot;&quot;&quot;Decode the base85-encoded bytes-like object or ASCII string b

    The result is returned as a bytes object.
    &quot;&quot;&quot;
    global _b85dec
    # Delay the initialization of tables to not waste memory
    # if the function is never called
    if _b85dec is None:
        _b85dec = [None] * 256
        for i, c in enumerate(_b85alphabet):
            _b85dec[c] = i

    b = _bytes_from_decode_data(b)
    padding = (-len(b)) % 5
    b = b + b&#039;~&#039; * padding
    out = []
    packI = struct.Struct(&#039;!I&#039;).pack
    for i in range(0, len(b), 5):
        chunk = b[i:i + 5]
        acc = 0
        try:
            for c in chunk:
                acc = acc * 85 + _b85dec[c]
        except TypeError:
            for j, c in enumerate(chunk):
                if _b85dec[c] is None:
                    raise ValueError(&#039;bad base85 character at position %d&#039;
                                    % (i + j)) from None
            raise
        try:
            out.append(packI(acc))
        except struct.error:
            raise ValueError(&#039;base85 overflow in hunk starting at byte %d&#039;
                             % i) from None

    result = b&#039;&#039;.join(out)
    if padding:
        result = result[:-padding]
    return result

# Legacy interface.  This code could be cleaned up since I don&#039;t believe
# binascii has any line length limitations.  It just doesn&#039;t seem worth it
# though.  The files should be opened in binary mode.

MAXLINESIZE = 76 # Excluding the CRLF
MAXBINSIZE = (MAXLINESIZE//4)*3

def encode(input, output):
    &quot;&quot;&quot;Encode a file; input and output are binary files.&quot;&quot;&quot;
    while True:
        s = input.read(MAXBINSIZE)
        if not s:
            break
        while len(s) &lt; MAXBINSIZE:
            ns = input.read(MAXBINSIZE-len(s))
            if not ns:
                break
            s += ns
        line = binascii.b2a_base64(s)
        output.write(line)


def decode(input, output):
    &quot;&quot;&quot;Decode a file; input and output are binary files.&quot;&quot;&quot;
    while True:
        line = input.readline()
        if not line:
            break
        s = binascii.a2b_base64(line)
        output.write(s)

def _input_type_check(s):
    try:
        m = memoryview(s)
    except TypeError as err:
        msg = &quot;expected bytes-like object, not %s&quot; % s.__class__.__name__
        raise TypeError(msg) from err
    if m.format not in (&#039;c&#039;, &#039;b&#039;, &#039;B&#039;):
        msg = (&quot;expected single byte elements, not %r from %s&quot; %
                                          (m.format, s.__class__.__name__))
        raise TypeError(msg)
    if m.ndim != 1:
        msg = (&quot;expected 1-D data, not %d-D data from %s&quot; %
                                          (m.ndim, s.__class__.__name__))
        raise TypeError(msg)


def encodebytes(s):
    &quot;&quot;&quot;Encode a bytestring into a bytes object containing multiple lines
    of base-64 data.&quot;&quot;&quot;
    _input_type_check(s)
    pieces = []
    for i in range(0, len(s), MAXBINSIZE):
        chunk = s[i : i + MAXBINSIZE]
        pieces.append(binascii.b2a_base64(chunk))
    return b&quot;&quot;.join(pieces)

def encodestring(s):
    &quot;&quot;&quot;Legacy alias of encodebytes().&quot;&quot;&quot;
    import warnings
    warnings.warn(&quot;encodestring() is a deprecated alias since 3.1, &quot;
                  &quot;use encodebytes()&quot;,
                  DeprecationWarning, 2)
    return encodebytes(s)


def decodebytes(s):
    &quot;&quot;&quot;Decode a bytestring of base-64 data into a bytes object.&quot;&quot;&quot;
    _input_type_check(s)
    return binascii.a2b_base64(s)

def decodestring(s):
    &quot;&quot;&quot;Legacy alias of decodebytes().&quot;&quot;&quot;
    import warnings
    warnings.warn(&quot;decodestring() is a deprecated alias since Python 3.1, &quot;
                  &quot;use decodebytes()&quot;,
                  DeprecationWarning, 2)
    return decodebytes(s)


# Usable as a script...
def main():
    &quot;&quot;&quot;Small main program&quot;&quot;&quot;
    import sys, getopt
    try:
        opts, args = getopt.getopt(sys.argv[1:], &#039;deut&#039;)
    except getopt.error as msg:
        sys.stdout = sys.stderr
        print(msg)
        print(&quot;&quot;&quot;usage: %s [-d|-e|-u|-t] [file|-]
        -d, -u: decode
        -e: encode (default)
        -t: encode and decode string &#039;Aladdin:open sesame&#039;&quot;&quot;&quot;%sys.argv[0])
        sys.exit(2)
    func = encode
    for o, a in opts:
        if o == &#039;-e&#039;: func = encode
        if o == &#039;-d&#039;: func = decode
        if o == &#039;-u&#039;: func = decode
        if o == &#039;-t&#039;: test(); return
    if args and args[0] != &#039;-&#039;:
        with open(args[0], &#039;rb&#039;) as f:
            func(f, sys.stdout.buffer)
    else:
        func(sys.stdin.buffer, sys.stdout.buffer)


def test():
    s0 = b&quot;Aladdin:open sesame&quot;
    print(repr(s0))
    s1 = encodebytes(s0)
    print(repr(s1))
    s2 = decodebytes(s1)
    print(repr(s2))
    assert s0 == s2


if __name__ == &#039;__main__&#039;:
    main()
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