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UrloMythus
231
mediaflow_proxy/utils/compat.py
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231
mediaflow_proxy/utils/compat.py
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# Author: Trevor Perrin
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# See the LICENSE file for legal information regarding use of this file.
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"""Miscellaneous functions to mask Python version differences."""
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import sys
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import re
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import platform
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import binascii
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import traceback
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import time
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if sys.version_info >= (3,0):
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def compat26Str(x): return x
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# Python 3.3 requires bytes instead of bytearrays for HMAC
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# So, python 2.6 requires strings, python 3 requires 'bytes',
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# and python 2.7 and 3.5 can handle bytearrays...
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# pylint: disable=invalid-name
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# we need to keep compatHMAC and `x` for API compatibility
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if sys.version_info < (3, 4):
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def compatHMAC(x):
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"""Convert bytes-like input to format acceptable for HMAC."""
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return bytes(x)
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else:
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def compatHMAC(x):
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"""Convert bytes-like input to format acceptable for HMAC."""
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return x
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# pylint: enable=invalid-name
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def compatAscii2Bytes(val):
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"""Convert ASCII string to bytes."""
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if isinstance(val, str):
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return bytes(val, 'ascii')
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return val
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def compat_b2a(val):
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"""Convert an ASCII bytes string to string."""
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return str(val, 'ascii')
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def raw_input(s):
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return input(s)
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# So, the python3 binascii module deals with bytearrays, and python2
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# deals with strings... I would rather deal with the "a" part as
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# strings, and the "b" part as bytearrays, regardless of python version,
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# so...
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def a2b_hex(s):
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try:
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b = bytearray(binascii.a2b_hex(bytearray(s, "ascii")))
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except Exception as e:
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raise SyntaxError("base16 error: %s" % e)
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return b
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def a2b_base64(s):
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try:
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if isinstance(s, str):
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s = bytearray(s, "ascii")
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b = bytearray(binascii.a2b_base64(s))
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except Exception as e:
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raise SyntaxError("base64 error: %s" % e)
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return b
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def b2a_hex(b):
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return binascii.b2a_hex(b).decode("ascii")
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def b2a_base64(b):
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return binascii.b2a_base64(b).decode("ascii")
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def readStdinBinary():
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return sys.stdin.buffer.read()
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def compatLong(num):
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return int(num)
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int_types = tuple([int])
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def formatExceptionTrace(e):
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"""Return exception information formatted as string"""
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return str(e)
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def time_stamp():
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"""Returns system time as a float"""
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if sys.version_info >= (3, 3):
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return time.perf_counter()
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return time.clock()
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def remove_whitespace(text):
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"""Removes all whitespace from passed in string"""
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return re.sub(r"\s+", "", text, flags=re.UNICODE)
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# pylint: disable=invalid-name
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# pylint is stupid here and deson't notice it's a function, not
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# constant
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bytes_to_int = int.from_bytes
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# pylint: enable=invalid-name
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def bit_length(val):
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"""Return number of bits necessary to represent an integer."""
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return val.bit_length()
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def int_to_bytes(val, length=None, byteorder="big"):
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"""Return number converted to bytes"""
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if length is None:
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if val:
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length = byte_length(val)
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else:
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length = 1
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# for gmpy we need to convert back to native int
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if type(val) != int:
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val = int(val)
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return bytearray(val.to_bytes(length=length, byteorder=byteorder))
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else:
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# Python 2.6 requires strings instead of bytearrays in a couple places,
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# so we define this function so it does the conversion if needed.
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# same thing with very old 2.7 versions
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# or on Jython
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if sys.version_info < (2, 7) or sys.version_info < (2, 7, 4) \
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or platform.system() == 'Java':
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def compat26Str(x): return str(x)
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def remove_whitespace(text):
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"""Removes all whitespace from passed in string"""
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return re.sub(r"\s+", "", text)
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def bit_length(val):
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"""Return number of bits necessary to represent an integer."""
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if val == 0:
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return 0
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return len(bin(val))-2
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else:
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def compat26Str(x): return x
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def remove_whitespace(text):
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"""Removes all whitespace from passed in string"""
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return re.sub(r"\s+", "", text, flags=re.UNICODE)
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def bit_length(val):
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"""Return number of bits necessary to represent an integer."""
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return val.bit_length()
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def compatAscii2Bytes(val):
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"""Convert ASCII string to bytes."""
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return val
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def compat_b2a(val):
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"""Convert an ASCII bytes string to string."""
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return str(val)
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# So, python 2.6 requires strings, python 3 requires 'bytes',
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# and python 2.7 can handle bytearrays...
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def compatHMAC(x): return compat26Str(x)
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def a2b_hex(s):
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try:
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b = bytearray(binascii.a2b_hex(s))
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except Exception as e:
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raise SyntaxError("base16 error: %s" % e)
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return b
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def a2b_base64(s):
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try:
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b = bytearray(binascii.a2b_base64(s))
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except Exception as e:
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raise SyntaxError("base64 error: %s" % e)
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return b
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def b2a_hex(b):
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return binascii.b2a_hex(compat26Str(b))
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def b2a_base64(b):
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return binascii.b2a_base64(compat26Str(b))
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def compatLong(num):
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return long(num)
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int_types = (int, long)
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# pylint on Python3 goes nuts for the sys dereferences...
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#pylint: disable=no-member
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def formatExceptionTrace(e):
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"""Return exception information formatted as string"""
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newStr = "".join(traceback.format_exception(sys.exc_type,
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sys.exc_value,
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sys.exc_traceback))
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return newStr
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#pylint: enable=no-member
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def time_stamp():
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"""Returns system time as a float"""
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return time.clock()
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def bytes_to_int(val, byteorder):
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"""Convert bytes to an int."""
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if not val:
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return 0
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if byteorder == "big":
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return int(b2a_hex(val), 16)
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if byteorder == "little":
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return int(b2a_hex(val[::-1]), 16)
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raise ValueError("Only 'big' and 'little' endian supported")
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def int_to_bytes(val, length=None, byteorder="big"):
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"""Return number converted to bytes"""
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if length is None:
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if val:
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length = byte_length(val)
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else:
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length = 1
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if byteorder == "big":
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return bytearray((val >> i) & 0xff
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for i in reversed(range(0, length*8, 8)))
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if byteorder == "little":
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return bytearray((val >> i) & 0xff
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for i in range(0, length*8, 8))
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raise ValueError("Only 'big' or 'little' endian supported")
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def byte_length(val):
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"""Return number of bytes necessary to represent an integer."""
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length = bit_length(val)
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return (length + 7) // 8
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ecdsaAllCurves = False
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ML_KEM_AVAILABLE = False
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ML_DSA_AVAILABLE = False
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