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from typing import Union, List
import hashlib
import os
def get_md5sum(data: str, length: int = None, blocksize: int=2**23) -> str:
"""获取文件的hash值前几位作为文件唯一标识符
Args:
path (str): 文件路径
length (int, optional): hash前多少位. Defaults to None.
blocksize (int, optional):分块读取，块的大小. Defaults to None.
Returns:
str: hash值前length位
"""
if isinstance(data, str):
if os.path.isfile(data):
signature = get_md5sum_of_file(path=data, length=length, blocksize=blocksize)
else:
signature = get_signature_of_string(data, length=length)
else:
raise ValueError(
"only support str or file path str, but given {}".format(type(data))
)
return signature
def get_md5sum_of_file(path: str, length: int = None, blocksize: int=2**23) -> str:
"""获取文件的hash值前几位作为文件唯一标识符
Args:
path (str): 文件路径
length (int, optional): hash前多少位. Defaults to None.
blocksize (int, optional):分块读取，块的大小. Defaults to None.
Returns:
str: hash值前length位
"""
# sig = (os.popen('md5sum {}'.format(path))).readlines()[0].split(' ')[0]
m = hashlib.md5()
with open(path, "rb") as f:
while chunk := f.read(blocksize):
m.update(chunk)
sig = m.hexdigest()
if length is not None:
sig = sig[:length]
return sig
def get_signature_of_string(string: str, length: int = None) -> str:
"""cal signature of string
Args:
string (str): target string
length (int, optional): only return the first length character of signature. Defaults to None.
Returns:
str: signature of string
"""
sig = hashlib.md5(string.encode()).hexdigest()
if length is not None:
sig = sig[:length]
return sig
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