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Edit File : xdrlib.py \| Size : 5.77 KB
"""Implements (a subset of) Sun XDR -- eXternal Data Representation. See: RFC 1014 """ import struct from io import BytesIO from functools import wraps __all__ = ["Error", "Packer", "Unpacker", "ConversionError"] # exceptions class Error(Exception): """Exception class for this module. Use: except xdrlib.Error as var: # var has the Error instance for the exception Public ivars: msg -- contains the message """ def __init__(self, msg): self.msg = msg def __repr__(self): return repr(self.msg) def __str__(self): return str(self.msg) class ConversionError(Error): pass def raise_conversion_error(function): """ Wrap any raised struct.errors in a ConversionError. """ @wraps(function) def result(self, value): try: return function(self, value) except struct.error as e: raise ConversionError(e.args[0]) from None return result class Packer: """Pack various data representations into a buffer.""" def __init__(self): self.reset() def reset(self): self.__buf = BytesIO() def get_buffer(self): return self.__buf.getvalue() # backwards compatibility get_buf = get_buffer @raise_conversion_error def pack_uint(self, x): self.__buf.write(struct.pack('>L', x)) @raise_conversion_error def pack_int(self, x): self.__buf.write(struct.pack('>l', x)) pack_enum = pack_int def pack_bool(self, x): if x: self.__buf.write(b'\0\0\0\1') else: self.__buf.write(b'\0\0\0\0') def pack_uhyper(self, x): try: self.pack_uint(x>>32 & 0xffffffff) except (TypeError, struct.error) as e: raise ConversionError(e.args[0]) from None try: self.pack_uint(x & 0xffffffff) except (TypeError, struct.error) as e: raise ConversionError(e.args[0]) from None pack_hyper = pack_uhyper @raise_conversion_error def pack_float(self, x): self.__buf.write(struct.pack('>f', x)) @raise_conversion_error def pack_double(self, x): self.__buf.write(struct.pack('>d', x)) def pack_fstring(self, n, s): if n < 0: raise ValueError('fstring size must be nonnegative') data = s[:n] n = ((n+3)//4)4 data = data + (n - len(data)) b'\0' self.__buf.write(data) pack_fopaque = pack_fstring def pack_string(self, s): n = len(s) self.pack_uint(n) self.pack_fstring(n, s) pack_opaque = pack_string pack_bytes = pack_string def pack_list(self, list, pack_item): for item in list: self.pack_uint(1) pack_item(item) self.pack_uint(0) def pack_farray(self, n, list, pack_item): if len(list) != n: raise ValueError('wrong array size') for item in list: pack_item(item) def pack_array(self, list, pack_item): n = len(list) self.pack_uint(n) self.pack_farray(n, list, pack_item) class Unpacker: """Unpacks various data representations from the given buffer.""" def __init__(self, data): self.reset(data) def reset(self, data): self.__buf = data self.__pos = 0 def get_position(self): return self.__pos def set_position(self, position): self.__pos = position def get_buffer(self): return self.__buf def done(self): if self.__pos < len(self.__buf): raise Error('unextracted data remains') def unpack_uint(self): i = self.__pos self.__pos = j = i+4 data = self.__buf[i:j] if len(data) < 4: raise EOFError return struct.unpack('>L', data)[0] def unpack_int(self): i = self.__pos self.__pos = j = i+4 data = self.__buf[i:j] if len(data) < 4: raise EOFError return struct.unpack('>l', data)[0] unpack_enum = unpack_int def unpack_bool(self): return bool(self.unpack_int()) def unpack_uhyper(self): hi = self.unpack_uint() lo = self.unpack_uint() return int(hi)<<32 \| lo def unpack_hyper(self): x = self.unpack_uhyper() if x >= 0x8000000000000000: x = x - 0x10000000000000000 return x def unpack_float(self): i = self.__pos self.__pos = j = i+4 data = self.__buf[i:j] if len(data) < 4: raise EOFError return struct.unpack('>f', data)[0] def unpack_double(self): i = self.__pos self.__pos = j = i+8 data = self.__buf[i:j] if len(data) < 8: raise EOFError return struct.unpack('>d', data)[0] def unpack_fstring(self, n): if n < 0: raise ValueError('fstring size must be nonnegative') i = self.__pos j = i + (n+3)//4*4 if j > len(self.__buf): raise EOFError self.__pos = j return self.__buf[i:i+n] unpack_fopaque = unpack_fstring def unpack_string(self): n = self.unpack_uint() return self.unpack_fstring(n) unpack_opaque = unpack_string unpack_bytes = unpack_string def unpack_list(self, unpack_item): list = [] while 1: x = self.unpack_uint() if x == 0: break if x != 1: raise ConversionError('0 or 1 expected, got %r' % (x,)) item = unpack_item() list.append(item) return list def unpack_farray(self, n, unpack_item): list = [] for i in range(n): list.append(unpack_item()) return list def unpack_array(self, unpack_item): n = self.unpack_uint() return self.unpack_farray(n, unpack_item) Back

Edit File : xdrlib.py | Size : 5.77 KB

"""Implements (a subset of) Sun XDR -- eXternal Data Representation.

See: RFC 1014

"""

import struct
from io import BytesIO
from functools import wraps

__all__ = ["Error", "Packer", "Unpacker", "ConversionError"]

# exceptions
class Error(Exception):
    """Exception class for this module. Use:

except xdrlib.Error as var:
        # var has the Error instance for the exception

Public ivars:
        msg -- contains the message

"""
    def __init__(self, msg):
        self.msg = msg
    def __repr__(self):
        return repr(self.msg)
    def __str__(self):
        return str(self.msg)

class ConversionError(Error):
    pass

def raise_conversion_error(function):
    """ Wrap any raised struct.errors in a ConversionError. """

@wraps(function)
    def result(self, value):
        try:
            return function(self, value)
        except struct.error as e:
            raise ConversionError(e.args[0]) from None
    return result

class Packer:
    """Pack various data representations into a buffer."""

def __init__(self):
        self.reset()

def reset(self):
        self.__buf = BytesIO()

def get_buffer(self):
        return self.__buf.getvalue()
    # backwards compatibility
    get_buf = get_buffer

@raise_conversion_error
    def pack_uint(self, x):
        self.__buf.write(struct.pack('>L', x))

@raise_conversion_error
    def pack_int(self, x):
        self.__buf.write(struct.pack('>l', x))

pack_enum = pack_int

def pack_bool(self, x):
        if x: self.__buf.write(b'\0\0\0\1')
        else: self.__buf.write(b'\0\0\0\0')

def pack_uhyper(self, x):
        try:
            self.pack_uint(x>>32 & 0xffffffff)
        except (TypeError, struct.error) as e:
            raise ConversionError(e.args[0]) from None
        try:
            self.pack_uint(x & 0xffffffff)
        except (TypeError, struct.error) as e:
            raise ConversionError(e.args[0]) from None

pack_hyper = pack_uhyper

@raise_conversion_error
    def pack_float(self, x):
        self.__buf.write(struct.pack('>f', x))

@raise_conversion_error
    def pack_double(self, x):
        self.__buf.write(struct.pack('>d', x))

def pack_fstring(self, n, s):
        if n < 0:
            raise ValueError('fstring size must be nonnegative')
        data = s[:n]
        n = ((n+3)//4)*4
        data = data + (n - len(data)) * b'\0'
        self.__buf.write(data)

pack_fopaque = pack_fstring

def pack_string(self, s):
        n = len(s)
        self.pack_uint(n)
        self.pack_fstring(n, s)

pack_opaque = pack_string
    pack_bytes = pack_string

def pack_list(self, list, pack_item):
        for item in list:
            self.pack_uint(1)
            pack_item(item)
        self.pack_uint(0)

def pack_farray(self, n, list, pack_item):
        if len(list) != n:
            raise ValueError('wrong array size')
        for item in list:
            pack_item(item)

def pack_array(self, list, pack_item):
        n = len(list)
        self.pack_uint(n)
        self.pack_farray(n, list, pack_item)

class Unpacker:
    """Unpacks various data representations from the given buffer."""

def __init__(self, data):
        self.reset(data)

def reset(self, data):
        self.__buf = data
        self.__pos = 0

def get_position(self):
        return self.__pos

def set_position(self, position):
        self.__pos = position

def get_buffer(self):
        return self.__buf

def done(self):
        if self.__pos < len(self.__buf):
            raise Error('unextracted data remains')

def unpack_uint(self):
        i = self.__pos
        self.__pos = j = i+4
        data = self.__buf[i:j]
        if len(data) < 4:
            raise EOFError
        return struct.unpack('>L', data)[0]

def unpack_int(self):
        i = self.__pos
        self.__pos = j = i+4
        data = self.__buf[i:j]
        if len(data) < 4:
            raise EOFError
        return struct.unpack('>l', data)[0]

unpack_enum = unpack_int

def unpack_bool(self):
        return bool(self.unpack_int())

def unpack_uhyper(self):
        hi = self.unpack_uint()
        lo = self.unpack_uint()
        return int(hi)<<32 | lo

def unpack_hyper(self):
        x = self.unpack_uhyper()
        if x >= 0x8000000000000000:
            x = x - 0x10000000000000000
        return x

def unpack_float(self):
        i = self.__pos
        self.__pos = j = i+4
        data = self.__buf[i:j]
        if len(data) < 4:
            raise EOFError
        return struct.unpack('>f', data)[0]

def unpack_double(self):
        i = self.__pos
        self.__pos = j = i+8
        data = self.__buf[i:j]
        if len(data) < 8:
            raise EOFError
        return struct.unpack('>d', data)[0]

def unpack_fstring(self, n):
        if n < 0:
            raise ValueError('fstring size must be nonnegative')
        i = self.__pos
        j = i + (n+3)//4*4
        if j > len(self.__buf):
            raise EOFError
        self.__pos = j
        return self.__buf[i:i+n]

unpack_fopaque = unpack_fstring

def unpack_string(self):
        n = self.unpack_uint()
        return self.unpack_fstring(n)

unpack_opaque = unpack_string
    unpack_bytes = unpack_string

def unpack_list(self, unpack_item):
        list = []
        while 1:
            x = self.unpack_uint()
            if x == 0: break
            if x != 1:
                raise ConversionError('0 or 1 expected, got %r' % (x,))
            item = unpack_item()
            list.append(item)
        return list

def unpack_farray(self, n, unpack_item):
        list = []
        for i in range(n):
            list.append(unpack_item())
        return list

def unpack_array(self, unpack_item):
        n = self.unpack_uint()
        return self.unpack_farray(n, unpack_item)

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