Issue #1023290: Added API for the conversion of longs to bytes and vice-versa.
This commit is contained in:
Alexandre Vassalotti
parent
a28e7028f9
commit
c36c3789de
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@ -457,6 +457,69 @@ Additional Methods on Integer Types
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.. versionadded:: 3.1
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.. method:: int.to_bytes(length, byteorder, [\*, signed=False])
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Return an array of bytes representing an integer.
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>>> (1024).to_bytes(2, byteorder='big')
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b'\x04\x00'
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>>> (1024).to_bytes(10, byteorder='big')
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b'\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00'
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>>> (-1024).to_bytes(10, byteorder='big', signed=True)
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b'\xff\xff\xff\xff\xff\xff\xff\xff\xfc\x00'
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>>> x = 1000
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>>> x.to_bytes((x.bit_length() // 8) + 1, byteorder='little')
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b'\xe8\x03'
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The integer is represented using *length* bytes. An :exc:`OverflowError`
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is raised if the integer is not representable with the given number of
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bytes.
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The *byteorder* argument determines the byte order used to represent the
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integer. If *byteorder* is ``"big"``, the most significant byte is at the
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beginning of the byte array. If *byteorder* is ``"little"``, the most
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significant byte is at the end of the byte array. To request the native
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byte order of the host system, use :data:`sys.byteorder` as the byte order
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value.
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The *signed* argument determines whether two's complement is used to
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represent the integer. If *signed* is ``False`` and a negative integer is
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given, an :exc:`OverflowError` is raised. The default value for *signed*
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is ``False``.
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.. versionadded:: 3.2
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.. classmethod:: int.from_bytes(bytes, byteorder, [\*, signed=False]])
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Return the integer represented by the given array of bytes.
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>>> int.from_bytes(b'\x00\x10', byteorder='big')
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16
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>>> int.from_bytes(b'\x00\x10', byteorder='little')
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4096
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>>> int.from_bytes(b'\xfc\x00', byteorder='big', signed=True)
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-1024
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>>> int.from_bytes(b'\xfc\x00', byteorder='big', signed=False)
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64512
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>>> int.from_bytes([255, 0, 0], byteorder='big')
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16711680
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The argument *bytes* must either support the buffer protocol or be an
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iterable producing bytes. :class:`bytes` and :class:`bytearray` are
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examples of built-in objects that support the buffer protocol.
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The *byteorder* argument determines the byte order used to represent the
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integer. If *byteorder* is ``"big"``, the most significant byte is at the
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beginning of the byte array. If *byteorder* is ``"little"``, the most
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significant byte is at the end of the byte array. To request the native
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byte order of the host system, use :data:`sys.byteorder` as the byte order
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value.
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The *signed* argument indicates whether two's complement is used to
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represent the integer.
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.. versionadded:: 3.2
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Additional Methods on Float
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---------------------------
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@ -4,6 +4,7 @@ import sys
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import random
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import math
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import array
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# Used for lazy formatting of failure messages
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class Frm(object):
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@ -900,6 +901,237 @@ class LongTest(unittest.TestCase):
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for e in bad_exponents:
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self.assertRaises(TypeError, round, 3, e)
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def test_to_bytes(self):
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def check(tests, byteorder, signed=False):
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for test, expected in tests.items():
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try:
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self.assertEqual(
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test.to_bytes(len(expected), byteorder, signed=signed),
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expected)
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except Exception as err:
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raise AssertionError(
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"failed to convert {0} with byteorder={1} and signed={2}"
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.format(test, byteorder, signed)) from err
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# Convert integers to signed big-endian byte arrays.
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tests1 = {
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0: b'\x00',
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1: b'\x01',
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-1: b'\xff',
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-127: b'\x81',
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-128: b'\x80',
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-129: b'\xff\x7f',
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127: b'\x7f',
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129: b'\x00\x81',
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-255: b'\xff\x01',
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-256: b'\xff\x00',
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255: b'\x00\xff',
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256: b'\x01\x00',
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32767: b'\x7f\xff',
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-32768: b'\xff\x80\x00',
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65535: b'\x00\xff\xff',
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-65536: b'\xff\x00\x00',
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-8388608: b'\x80\x00\x00'
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}
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check(tests1, 'big', signed=True)
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# Convert integers to signed little-endian byte arrays.
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tests2 = {
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0: b'\x00',
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1: b'\x01',
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-1: b'\xff',
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-127: b'\x81',
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-128: b'\x80',
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-129: b'\x7f\xff',
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127: b'\x7f',
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129: b'\x81\x00',
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-255: b'\x01\xff',
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-256: b'\x00\xff',
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255: b'\xff\x00',
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256: b'\x00\x01',
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32767: b'\xff\x7f',
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-32768: b'\x00\x80',
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65535: b'\xff\xff\x00',
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-65536: b'\x00\x00\xff',
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-8388608: b'\x00\x00\x80'
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}
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check(tests2, 'little', signed=True)
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# Convert integers to unsigned big-endian byte arrays.
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tests3 = {
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0: b'\x00',
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1: b'\x01',
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127: b'\x7f',
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128: b'\x80',
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255: b'\xff',
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256: b'\x01\x00',
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32767: b'\x7f\xff',
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32768: b'\x80\x00',
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65535: b'\xff\xff',
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65536: b'\x01\x00\x00'
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}
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check(tests3, 'big', signed=False)
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# Convert integers to unsigned little-endian byte arrays.
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tests4 = {
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0: b'\x00',
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1: b'\x01',
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127: b'\x7f',
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128: b'\x80',
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255: b'\xff',
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256: b'\x00\x01',
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32767: b'\xff\x7f',
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32768: b'\x00\x80',
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65535: b'\xff\xff',
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65536: b'\x00\x00\x01'
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}
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check(tests4, 'little', signed=False)
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self.assertRaises(OverflowError, (256).to_bytes, 1, 'big', signed=False)
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self.assertRaises(OverflowError, (256).to_bytes, 1, 'big', signed=True)
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self.assertRaises(OverflowError, (256).to_bytes, 1, 'little', signed=False)
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self.assertRaises(OverflowError, (256).to_bytes, 1, 'little', signed=True)
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self.assertRaises(OverflowError, (-1).to_bytes, 2, 'big', signed=False),
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self.assertRaises(OverflowError, (-1).to_bytes, 2, 'little', signed=False)
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self.assertEqual((0).to_bytes(0, 'big'), b'')
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self.assertEqual((1).to_bytes(5, 'big'), b'\x00\x00\x00\x00\x01')
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self.assertEqual((0).to_bytes(5, 'big'), b'\x00\x00\x00\x00\x00')
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self.assertEqual((-1).to_bytes(5, 'big', signed=True),
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b'\xff\xff\xff\xff\xff')
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self.assertRaises(OverflowError, (1).to_bytes, 0, 'big')
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def test_from_bytes(self):
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def check(tests, byteorder, signed=False):
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for test, expected in tests.items():
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try:
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self.assertEqual(
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int.from_bytes(test, byteorder, signed=signed),
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expected)
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except Exception as err:
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raise AssertionError(
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"failed to convert {0} with byteorder={1!r} and signed={2}"
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.format(test, byteorder, signed)) from err
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# Convert signed big-endian byte arrays to integers.
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tests1 = {
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b'': 0,
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b'\x00': 0,
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b'\x00\x00': 0,
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b'\x01': 1,
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b'\x00\x01': 1,
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b'\xff': -1,
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b'\xff\xff': -1,
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b'\x81': -127,
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b'\x80': -128,
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b'\xff\x7f': -129,
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b'\x7f': 127,
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b'\x00\x81': 129,
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b'\xff\x01': -255,
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b'\xff\x00': -256,
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b'\x00\xff': 255,
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b'\x01\x00': 256,
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b'\x7f\xff': 32767,
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b'\x80\x00': -32768,
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b'\x00\xff\xff': 65535,
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b'\xff\x00\x00': -65536,
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b'\x80\x00\x00': -8388608
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}
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check(tests1, 'big', signed=True)
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# Convert signed little-endian byte arrays to integers.
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tests2 = {
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b'': 0,
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b'\x00': 0,
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b'\x00\x00': 0,
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b'\x01': 1,
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b'\x00\x01': 256,
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b'\xff': -1,
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b'\xff\xff': -1,
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b'\x81': -127,
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b'\x80': -128,
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b'\x7f\xff': -129,
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b'\x7f': 127,
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b'\x81\x00': 129,
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b'\x01\xff': -255,
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b'\x00\xff': -256,
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b'\xff\x00': 255,
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b'\x00\x01': 256,
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b'\xff\x7f': 32767,
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b'\x00\x80': -32768,
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b'\xff\xff\x00': 65535,
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b'\x00\x00\xff': -65536,
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b'\x00\x00\x80': -8388608
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}
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check(tests2, 'little', signed=True)
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# Convert unsigned big-endian byte arrays to integers.
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tests3 = {
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b'': 0,
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b'\x00': 0,
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b'\x01': 1,
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b'\x7f': 127,
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b'\x80': 128,
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b'\xff': 255,
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b'\x01\x00': 256,
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b'\x7f\xff': 32767,
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b'\x80\x00': 32768,
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b'\xff\xff': 65535,
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b'\x01\x00\x00': 65536,
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}
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check(tests3, 'big', signed=False)
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# Convert integers to unsigned little-endian byte arrays.
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tests4 = {
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b'': 0,
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b'\x00': 0,
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b'\x01': 1,
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b'\x7f': 127,
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b'\x80': 128,
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b'\xff': 255,
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b'\x00\x01': 256,
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b'\xff\x7f': 32767,
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b'\x00\x80': 32768,
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b'\xff\xff': 65535,
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b'\x00\x00\x01': 65536,
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}
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check(tests4, 'little', signed=False)
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class myint(int):
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pass
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self.assertTrue(type(myint.from_bytes(b'\x00', 'big')) is myint)
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self.assertEqual(myint.from_bytes(b'\x01', 'big'), 1)
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self.assertTrue(
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type(myint.from_bytes(b'\x00', 'big', signed=False)) is myint)
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self.assertEqual(myint.from_bytes(b'\x01', 'big', signed=False), 1)
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self.assertTrue(type(myint.from_bytes(b'\x00', 'little')) is myint)
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self.assertEqual(myint.from_bytes(b'\x01', 'little'), 1)
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self.assertTrue(type(myint.from_bytes(
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b'\x00', 'little', signed=False)) is myint)
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self.assertEqual(myint.from_bytes(b'\x01', 'little', signed=False), 1)
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self.assertEqual(
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int.from_bytes([255, 0, 0], 'big', signed=True), -65536)
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self.assertEqual(
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int.from_bytes((255, 0, 0), 'big', signed=True), -65536)
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self.assertEqual(int.from_bytes(
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bytearray(b'\xff\x00\x00'), 'big', signed=True), -65536)
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self.assertEqual(int.from_bytes(
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bytearray(b'\xff\x00\x00'), 'big', signed=True), -65536)
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self.assertEqual(int.from_bytes(
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array.array('B', b'\xff\x00\x00'), 'big', signed=True), -65536)
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self.assertEqual(int.from_bytes(
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memoryview(b'\xff\x00\x00'), 'big', signed=True), -65536)
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self.assertRaises(ValueError, int.from_bytes, [256], 'big')
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self.assertRaises(ValueError, int.from_bytes, [0], 'big\x00')
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self.assertRaises(ValueError, int.from_bytes, [0], 'little\x00')
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self.assertRaises(TypeError, int.from_bytes, "", 'big')
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self.assertRaises(TypeError, int.from_bytes, "\x00", 'big')
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self.assertRaises(TypeError, int.from_bytes, 0, 'big')
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self.assertRaises(TypeError, int.from_bytes, 0, 'big', True)
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self.assertRaises(TypeError, myint.from_bytes, "", 'big')
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self.assertRaises(TypeError, myint.from_bytes, "\x00", 'big')
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self.assertRaises(TypeError, myint.from_bytes, 0, 'big')
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self.assertRaises(TypeError, int.from_bytes, 0, 'big', True)
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def test_main():
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@ -149,6 +149,9 @@ Core and Builtins
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- Issue #6687: PyBytes_FromObject() no longer accepts an integer as its
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argument to construct a null-initialized bytes object.
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- Issue #1023290: Add from_bytes() and to_bytes() methods to integers.
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These methods allow the conversion of integers to bytes, and vice-versa.
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C-API
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-----
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@ -4296,6 +4296,201 @@ long_is_finite(PyObject *v)
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}
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#endif
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PyDoc_STRVAR(long_to_bytes_doc,
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"int.to_bytes(length, byteorder, *, signed=False) -> bytes\n\
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\n\
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Return an array of bytes representing an integer.\n\
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\n\
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The integer is represented using length bytes. An OverflowError is\n\
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raised if the integer is not representable with the given number of\n\
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bytes.\n\
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\n\
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The byteorder argument determines the byte order used to represent the\n\
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integer. If byteorder is 'big', the most significant byte is at the\n\
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beginning of the byte array. If byteorder is 'little', the most\n\
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significant byte is at the end of the byte array. To request the native\n\
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byte order of the host system, use `sys.byteorder' as the byte order value.\n\
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\n\
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The signed keyword-only argument determines whether two's complement is\n\
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used to represent the integer. If signed is False and a negative integer\n\
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is given, an OverflowError is raised.");
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static PyObject *
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long_to_bytes(PyLongObject *v, PyObject *args, PyObject *kwds)
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{
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PyObject *byteorder_str;
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PyObject *is_signed_obj = NULL;
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Py_ssize_t length;
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int little_endian;
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int is_signed;
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PyObject *bytes;
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static PyObject *little_str = NULL, *big_str = NULL;
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static char *kwlist[] = {"length", "byteorder", "signed", NULL};
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "nO|O:to_bytes", kwlist,
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&length, &byteorder_str,
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&is_signed_obj))
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return NULL;
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if (args != NULL && Py_SIZE(args) > 2) {
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PyErr_SetString(PyExc_TypeError,
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"'signed' is a keyword-only argument");
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return NULL;
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}
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if (little_str == NULL) {
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little_str = PyUnicode_InternFromString("little");
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big_str = PyUnicode_InternFromString("big");
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if (little_str == NULL || big_str == NULL)
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return NULL;
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}
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if (PyObject_RichCompareBool(byteorder_str, little_str, Py_EQ))
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little_endian = 1;
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else if (PyObject_RichCompareBool(byteorder_str, big_str, Py_EQ))
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little_endian = 0;
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else {
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PyErr_SetString(PyExc_ValueError,
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"byteorder must be either 'little' or 'big'");
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return NULL;
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}
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if (is_signed_obj != NULL) {
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int cmp = PyObject_IsTrue(is_signed_obj);
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if (cmp < 0)
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return NULL;
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is_signed = cmp ? 1 : 0;
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}
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else {
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/* If the signed argument was omitted, use False as the
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default. */
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is_signed = 0;
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}
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if (length < 0) {
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PyErr_SetString(PyExc_ValueError,
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"length argument must be non-negative");
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return NULL;
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}
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bytes = PyBytes_FromStringAndSize(NULL, length);
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if (bytes == NULL)
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return NULL;
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if (_PyLong_AsByteArray(v, (unsigned char *)PyBytes_AS_STRING(bytes),
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length, little_endian, is_signed) < 0) {
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Py_DECREF(bytes);
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return NULL;
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}
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return bytes;
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}
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PyDoc_STRVAR(long_from_bytes_doc,
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"int.from_bytes(bytes, byteorder, *, signed=False) -> int\n\
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\n\
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Return the integer represented by the given array of bytes.\n\
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\n\
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The bytes argument must either support the buffer protocol or be an\n\
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iterable object producing bytes. Bytes and bytearray are examples of\n\
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built-in objects that support the buffer protocol.\n\
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\n\
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The byteorder argument determines the byte order used to represent the\n\
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integer. If byteorder is 'big', the most significant byte is at the\n\
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beginning of the byte array. If byteorder is 'little', the most\n\
|
||||
significant byte is at the end of the byte array. To request the native\n\
|
||||
byte order of the host system, use `sys.byteorder' as the byte order value.\n\
|
||||
\n\
|
||||
The signed keyword-only argument indicates whether two's complement is\n\
|
||||
used to represent the integer.");
|
||||
|
||||
static PyObject *
|
||||
long_from_bytes(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
||||
{
|
||||
PyObject *byteorder_str;
|
||||
PyObject *is_signed_obj = NULL;
|
||||
int little_endian;
|
||||
int is_signed;
|
||||
PyObject *obj;
|
||||
PyObject *bytes;
|
||||
PyObject *long_obj;
|
||||
static PyObject *little_str = NULL, *big_str = NULL;
|
||||
static char *kwlist[] = {"bytes", "byteorder", "signed", NULL};
|
||||
|
||||
if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO|O:from_bytes", kwlist,
|
||||
&obj, &byteorder_str,
|
||||
&is_signed_obj))
|
||||
return NULL;
|
||||
|
||||
if (args != NULL && Py_SIZE(args) > 2) {
|
||||
PyErr_SetString(PyExc_TypeError,
|
||||
"'signed' is a keyword-only argument");
|
||||
return NULL;
|
||||
}
|
||||
if (little_str == NULL) {
|
||||
little_str = PyUnicode_InternFromString("little");
|
||||
big_str = PyUnicode_InternFromString("big");
|
||||
if (little_str == NULL || big_str == NULL)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (PyObject_RichCompareBool(byteorder_str, little_str, Py_EQ))
|
||||
little_endian = 1;
|
||||
else if (PyObject_RichCompareBool(byteorder_str, big_str, Py_EQ))
|
||||
little_endian = 0;
|
||||
else {
|
||||
PyErr_SetString(PyExc_ValueError,
|
||||
"byteorder must be either 'little' or 'big'");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (is_signed_obj != NULL) {
|
||||
int cmp = PyObject_IsTrue(is_signed_obj);
|
||||
if (cmp < 0)
|
||||
return NULL;
|
||||
is_signed = cmp ? 1 : 0;
|
||||
}
|
||||
else {
|
||||
/* If the signed argument was omitted, use False as the
|
||||
default. */
|
||||
is_signed = 0;
|
||||
}
|
||||
|
||||
bytes = PyObject_Bytes(obj);
|
||||
if (bytes == NULL)
|
||||
return NULL;
|
||||
|
||||
long_obj = _PyLong_FromByteArray(
|
||||
(unsigned char *)PyBytes_AS_STRING(bytes), Py_SIZE(bytes),
|
||||
little_endian, is_signed);
|
||||
Py_DECREF(bytes);
|
||||
|
||||
/* If from_bytes() was used on subclass, allocate new subclass
|
||||
* instance, initialize it with decoded long value and return it.
|
||||
*/
|
||||
if (type != &PyLong_Type && PyType_IsSubtype(type, &PyLong_Type)) {
|
||||
PyLongObject *newobj;
|
||||
int i;
|
||||
Py_ssize_t n = ABS(Py_SIZE(long_obj));
|
||||
|
||||
newobj = (PyLongObject *)type->tp_alloc(type, n);
|
||||
if (newobj == NULL) {
|
||||
Py_DECREF(long_obj);
|
||||
return NULL;
|
||||
}
|
||||
assert(PyLong_Check(newobj));
|
||||
Py_SIZE(newobj) = Py_SIZE(long_obj);
|
||||
for (i = 0; i < n; i++) {
|
||||
newobj->ob_digit[i] =
|
||||
((PyLongObject *)long_obj)->ob_digit[i];
|
||||
}
|
||||
Py_DECREF(long_obj);
|
||||
return (PyObject *)newobj;
|
||||
}
|
||||
|
||||
return long_obj;
|
||||
}
|
||||
|
||||
static PyMethodDef long_methods[] = {
|
||||
{"conjugate", (PyCFunction)long_long, METH_NOARGS,
|
||||
"Returns self, the complex conjugate of any int."},
|
||||
|
|
@ -4305,6 +4500,10 @@ static PyMethodDef long_methods[] = {
|
|||
{"is_finite", (PyCFunction)long_is_finite, METH_NOARGS,
|
||||
"Returns always True."},
|
||||
#endif
|
||||
{"to_bytes", (PyCFunction)long_to_bytes,
|
||||
METH_VARARGS|METH_KEYWORDS, long_to_bytes_doc},
|
||||
{"from_bytes", (PyCFunction)long_from_bytes,
|
||||
METH_VARARGS|METH_KEYWORDS|METH_CLASS, long_from_bytes_doc},
|
||||
{"__trunc__", (PyCFunction)long_long, METH_NOARGS,
|
||||
"Truncating an Integral returns itself."},
|
||||
{"__floor__", (PyCFunction)long_long, METH_NOARGS,
|
||||
|
|
|
|||
Loading…
Reference in New Issue