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

&quot;&quot;&quot;Conversions to/from quoted-printable transport encoding as per RFC 1521.&quot;&quot;&quot;

# (Dec 1991 version).

__all__ = [&quot;encode&quot;, &quot;decode&quot;, &quot;encodestring&quot;, &quot;decodestring&quot;]

ESCAPE = b&#039;=&#039;
MAXLINESIZE = 76
HEX = b&#039;0123456789ABCDEF&#039;
EMPTYSTRING = b&#039;&#039;

try:
    from binascii import a2b_qp, b2a_qp
except ImportError:
    a2b_qp = None
    b2a_qp = None


def needsquoting(c, quotetabs, header):
    &quot;&quot;&quot;Decide whether a particular byte ordinal needs to be quoted.

    The &#039;quotetabs&#039; flag indicates whether embedded tabs and spaces should be
    quoted.  Note that line-ending tabs and spaces are always encoded, as per
    RFC 1521.
    &quot;&quot;&quot;
    assert isinstance(c, bytes)
    if c in b&#039; \t&#039;:
        return quotetabs
    # if header, we have to escape _ because _ is used to escape space
    if c == b&#039;_&#039;:
        return header
    return c == ESCAPE or not (b&#039; &#039; &lt;= c &lt;= b&#039;~&#039;)

def quote(c):
    &quot;&quot;&quot;Quote a single character.&quot;&quot;&quot;
    assert isinstance(c, bytes) and len(c)==1
    c = ord(c)
    return ESCAPE + bytes((HEX[c//16], HEX[c%16]))


def encode(input, output, quotetabs, header=False):
    &quot;&quot;&quot;Read &#039;input&#039;, apply quoted-printable encoding, and write to &#039;output&#039;.

    &#039;input&#039; and &#039;output&#039; are binary file objects. The &#039;quotetabs&#039; flag
    indicates whether embedded tabs and spaces should be quoted. Note that
    line-ending tabs and spaces are always encoded, as per RFC 1521.
    The &#039;header&#039; flag indicates whether we are encoding spaces as _ as per RFC
    1522.&quot;&quot;&quot;

    if b2a_qp is not None:
        data = input.read()
        odata = b2a_qp(data, quotetabs=quotetabs, header=header)
        output.write(odata)
        return

    def write(s, output=output, lineEnd=b&#039;\n&#039;):
        # RFC 1521 requires that the line ending in a space or tab must have
        # that trailing character encoded.
        if s and s[-1:] in b&#039; \t&#039;:
            output.write(s[:-1] + quote(s[-1:]) + lineEnd)
        elif s == b&#039;.&#039;:
            output.write(quote(s) + lineEnd)
        else:
            output.write(s + lineEnd)

    prevline = None
    while 1:
        line = input.readline()
        if not line:
            break
        outline = []
        # Strip off any readline induced trailing newline
        stripped = b&#039;&#039;
        if line[-1:] == b&#039;\n&#039;:
            line = line[:-1]
            stripped = b&#039;\n&#039;
        # Calculate the un-length-limited encoded line
        for c in line:
            c = bytes((c,))
            if needsquoting(c, quotetabs, header):
                c = quote(c)
            if header and c == b&#039; &#039;:
                outline.append(b&#039;_&#039;)
            else:
                outline.append(c)
        # First, write out the previous line
        if prevline is not None:
            write(prevline)
        # Now see if we need any soft line breaks because of RFC-imposed
        # length limitations.  Then do the thisline-&gt;prevline dance.
        thisline = EMPTYSTRING.join(outline)
        while len(thisline) &gt; MAXLINESIZE:
            # Don&#039;t forget to include the soft line break `=&#039; sign in the
            # length calculation!
            write(thisline[:MAXLINESIZE-1], lineEnd=b&#039;=\n&#039;)
            thisline = thisline[MAXLINESIZE-1:]
        # Write out the current line
        prevline = thisline
    # Write out the last line, without a trailing newline
    if prevline is not None:
        write(prevline, lineEnd=stripped)

def encodestring(s, quotetabs=False, header=False):
    if b2a_qp is not None:
        return b2a_qp(s, quotetabs=quotetabs, header=header)
    from io import BytesIO
    infp = BytesIO(s)
    outfp = BytesIO()
    encode(infp, outfp, quotetabs, header)
    return outfp.getvalue()


def decode(input, output, header=False):
    &quot;&quot;&quot;Read &#039;input&#039;, apply quoted-printable decoding, and write to &#039;output&#039;.
    &#039;input&#039; and &#039;output&#039; are binary file objects.
    If &#039;header&#039; is true, decode underscore as space (per RFC 1522).&quot;&quot;&quot;

    if a2b_qp is not None:
        data = input.read()
        odata = a2b_qp(data, header=header)
        output.write(odata)
        return

    new = b&#039;&#039;
    while 1:
        line = input.readline()
        if not line: break
        i, n = 0, len(line)
        if n &gt; 0 and line[n-1:n] == b&#039;\n&#039;:
            partial = 0; n = n-1
            # Strip trailing whitespace
            while n &gt; 0 and line[n-1:n] in b&quot; \t\r&quot;:
                n = n-1
        else:
            partial = 1
        while i &lt; n:
            c = line[i:i+1]
            if c == b&#039;_&#039; and header:
                new = new + b&#039; &#039;; i = i+1
            elif c != ESCAPE:
                new = new + c; i = i+1
            elif i+1 == n and not partial:
                partial = 1; break
            elif i+1 &lt; n and line[i+1:i+2] == ESCAPE:
                new = new + ESCAPE; i = i+2
            elif i+2 &lt; n and ishex(line[i+1:i+2]) and ishex(line[i+2:i+3]):
                new = new + bytes((unhex(line[i+1:i+3]),)); i = i+3
            else: # Bad escape sequence -- leave it in
                new = new + c; i = i+1
        if not partial:
            output.write(new + b&#039;\n&#039;)
            new = b&#039;&#039;
    if new:
        output.write(new)

def decodestring(s, header=False):
    if a2b_qp is not None:
        return a2b_qp(s, header=header)
    from io import BytesIO
    infp = BytesIO(s)
    outfp = BytesIO()
    decode(infp, outfp, header=header)
    return outfp.getvalue()


# Other helper functions
def ishex(c):
    &quot;&quot;&quot;Return true if the byte ordinal &#039;c&#039; is a hexadecimal digit in ASCII.&quot;&quot;&quot;
    assert isinstance(c, bytes)
    return b&#039;0&#039; &lt;= c &lt;= b&#039;9&#039; or b&#039;a&#039; &lt;= c &lt;= b&#039;f&#039; or b&#039;A&#039; &lt;= c &lt;= b&#039;F&#039;

def unhex(s):
    &quot;&quot;&quot;Get the integer value of a hexadecimal number.&quot;&quot;&quot;
    bits = 0
    for c in s:
        c = bytes((c,))
        if b&#039;0&#039; &lt;= c &lt;= b&#039;9&#039;:
            i = ord(&#039;0&#039;)
        elif b&#039;a&#039; &lt;= c &lt;= b&#039;f&#039;:
            i = ord(&#039;a&#039;)-10
        elif b&#039;A&#039; &lt;= c &lt;= b&#039;F&#039;:
            i = ord(b&#039;A&#039;)-10
        else:
            assert False, &quot;non-hex digit &quot;+repr(c)
        bits = bits*16 + (ord(c) - i)
    return bits


def main():
    import sys
    import getopt
    try:
        opts, args = getopt.getopt(sys.argv[1:], &#039;td&#039;)
    except getopt.error as msg:
        sys.stdout = sys.stderr
        print(msg)
        print(&quot;usage: quopri [-t | -d] [file] ...&quot;)
        print(&quot;-t: quote tabs&quot;)
        print(&quot;-d: decode; default encode&quot;)
        sys.exit(2)
    deco = 0
    tabs = 0
    for o, a in opts:
        if o == &#039;-t&#039;: tabs = 1
        if o == &#039;-d&#039;: deco = 1
    if tabs and deco:
        sys.stdout = sys.stderr
        print(&quot;-t and -d are mutually exclusive&quot;)
        sys.exit(2)
    if not args: args = [&#039;-&#039;]
    sts = 0
    for file in args:
        if file == &#039;-&#039;:
            fp = sys.stdin.buffer
        else:
            try:
                fp = open(file, &quot;rb&quot;)
            except OSError as msg:
                sys.stderr.write(&quot;%s: can&#039;t open (%s)\n&quot; % (file, msg))
                sts = 1
                continue
        try:
            if deco:
                decode(fp, sys.stdout.buffer)
            else:
                encode(fp, sys.stdout.buffer, tabs)
        finally:
            if file != &#039;-&#039;:
                fp.close()
    if sts:
        sys.exit(sts)


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