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# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
# MIT license
"""
Hash utilities.
md5 :
Calculate the MD5 checksum of the file.
"""
import hashlib
def calc_md5(filepath, blocksize=65536):
"""
Calculate the MD5 checksum/digest of the file data.
Parameters
----------
filepath : str
The path to the file
blocksize : int, optional
The block size (bytes) of chunks when read the file.
Returns
-------
digest : str
The checksum/digest of the file data, containing only hexadecimal
digits.
Credits
-------
- Stackoverflow: Generating an MD5 checksum of a file
https://stackoverflow.com/a/3431838/4856091
"""
hasher = hashlib.md5()
with open(filepath, "rb") as f:
for chunk in iter(lambda: f.read(blocksize), b""):
hasher.update(chunk)
return hasher.hexdigest()
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