# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: quopri.py
"""Conversions to/from quoted-printable transport encoding as per RFC 1521."""
__all__ = ["encode", "decode", "encodestring", "decodestring"]
ESCAPE = b"="
MAXLINESIZE = 76
HEX = b"0123456789ABCDEF"
EMPTYSTRING = b""
try:
    from binascii import a2b_qp, b2a_qp
except ImportError:
    a2b_qp = None
    b2a_qp = None


def needsquoting(c, quotetabs, header):
    """Decide whether a particular byte ordinal needs to be quoted.
    
    The 'quotetabs' flag indicates whether embedded tabs and spaces should be
    quoted.  Note that line-ending tabs and spaces are always encoded, as per
    RFC 1521.
    """
    if not isinstance(c, bytes):
        raise AssertionError
    if c in b" \t":
        return quotetabs
    elif c == b"_":
        return header
    else:
        return c == ESCAPE or not b" " <= c <= b"~"


def quote(c):
    """Quote a single character."""
    if not (isinstance(c, bytes) and len(c) == 1):
        raise AssertionError
    c = ord(c)
    return ESCAPE + bytes((HEX[c // 16], HEX[c % 16]))


def encode(input, output, quotetabs, header=False):
    """Read 'input', apply quoted-printable encoding, and write to 'output'.
    
    'input' and 'output' are binary file objects. The 'quotetabs' 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 'header' flag indicates whether we are encoding spaces as _ as per RFC
    1522."""
    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"\n"):
        if s:
            if s[-1:] in b" \t":
                output.write(s[:-1] + quote(s[-1:]) + lineEnd)
            if s == b".":
                output.write(quote(s) + lineEnd)
            else:
                output.write(s + lineEnd)

    prevline = None
    while True:
        line = input.readline()
        if not line:
            break
        outline = []
        stripped = b""
        if line[-1:] == b"\n":
            line = line[:-1]
            stripped = b"\n"
        for c in line:
            c = bytes((c,))
            if needsquoting(c, quotetabs, header):
                c = quote(c)
            if header:
                if c == b" ":
                    outline.append(b"_")
            else:
                outline.append(c)

        if prevline is not None:
            write(prevline)
        thisline = EMPTYSTRING.join(outline)
        while len(thisline) > MAXLINESIZE:
            write(thisline[: MAXLINESIZE - 1], lineEnd=b"=\n")
            thisline = thisline[MAXLINESIZE - 1 :]

        prevline = thisline

    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)
    else:
        from io import BytesIO

        infp = BytesIO(s)
        outfp = BytesIO()
        encode(infp, outfp, quotetabs, header)
        return outfp.getvalue()


def decode(input, output, header=False):
    """Read 'input', apply quoted-printable decoding, and write to 'output'.
    'input' and 'output' are binary file objects.
    If 'header' is true, decode underscore as space (per RFC 1522)."""
    if a2b_qp is not None:
        data = input.read()
        odata = a2b_qp(data, header=header)
        output.write(odata)
        return
    new = b""
    while 1:
        line = input.readline()
        if not line:
            break
        i, n = 0, len(line)
        if n > 0:
            if line[n - 1 : n] == b"\n":
                partial = 0
                n = n - 1
                while n > 0:
                    if line[n - 1 : n] in b" \t\r":
                        n = n - 1

            partial = 1
        while i < n:
            c = line[i : i + 1]
            if c == b"_":
                if header:
                    new = new + b" "
                    i = i + 1
            elif c != ESCAPE:
                new = new + c
                i = i + 1
            elif i + 1 == n:
                if not partial:
                    partial = 1
                    break
            elif i + 1 < n:
                if line[i + 1 : i + 2] == ESCAPE:
                    new = new + ESCAPE
                    i = i + 2
            elif i + 2 < n:
                if ishex(line[i + 1 : i + 2]):
                    if ishex(line[i + 2 : i + 3]):
                        new = new + bytes((unhex(line[i + 1 : i + 3]),))
                        i = i + 3
            else:
                new = new + c
                i = i + 1

        if not partial:
            output.write(new + b"\n")
            new = b""

    if new:
        output.write(new)


def decodestring(s, header=False):
    if a2b_qp is not None:
        return a2b_qp(s, header=header)
    else:
        from io import BytesIO

        infp = BytesIO(s)
        outfp = BytesIO()
        decode(infp, outfp, header=header)
        return outfp.getvalue()


def ishex(c):
    """Return true if the byte ordinal 'c' is a hexadecimal digit in ASCII."""
    if not isinstance(c, bytes):
        raise AssertionError
    return b"0" <= c <= b"9" or b"a" <= c <= b"f" or b"A" <= c <= b"F"


def unhex(s):
    """Get the integer value of a hexadecimal number."""
    bits = 0
    for c in s:
        c = bytes((c,))
        if b"0" <= c <= b"9":
            i = ord("0")
        else:
            if b"a" <= c <= b"f":
                i = ord("a") - 10
            else:
                if b"A" <= c <= b"F":
                    i = ord(b"A") - 10
                else:
                    if not False:
                        raise AssertionError("non-hex digit " + repr(c))
        bits = bits * 16 + (ord(c) - i)

    return bits


def main():
    import sys, getopt

    try:
        opts, args = getopt.getopt(sys.argv[1:], "td")
    except getopt.error as msg:
        sys.stdout = sys.stderr
        print(msg)
        print("usage: quopri [-t | -d] [file] ...")
        print("-t: quote tabs")
        print("-d: decode; default encode")
        sys.exit(2)

    deco = 0
    tabs = 0
    for o, a in opts:
        if o == "-t":
            tabs = 1
        if o == "-d":
            deco = 1

    if tabs:
        if deco:
            sys.stdout = sys.stderr
            print("-t and -d are mutually exclusive")
            sys.exit(2)
    if not args:
        args = ["-"]
    sts = 0
    for file in args:
        if file == "-":
            fp = sys.stdin.buffer
        else:
            try:
                fp = open(file, "rb")
            except OSError as msg:
                sys.stderr.write("%s: can't open (%s)\n" % (file, msg))
                sts = 1
                continue

            try:
                if deco:
                    decode(fp, sys.stdout.buffer)
                else:
                    encode(fp, sys.stdout.buffer, tabs)
            finally:
                if file != "-":
                    fp.close()

    if sts:
        sys.exit(sts)


if __name__ == "__main__":
    main()