mirror of
https://github.com/9001/copyparty.git
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90 lines
1.9 KiB
Python
Executable File
90 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
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import sys
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import json
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import zlib
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import struct
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import base64
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import hashlib
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try:
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from copyparty.util import fsenc
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except:
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def fsenc(p):
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return p
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"""
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calculates various checksums for uploads,
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usage: -mtp crc32,md5,sha1,sha256b=ad,bin/mtag/cksum.py
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"""
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def main():
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config = "crc32 md5 md5b sha1 sha1b sha256 sha256b sha512/240 sha512b/240"
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# b suffix = base64 encoded
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# slash = truncate to n bits
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known = {
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"md5": hashlib.md5,
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"sha1": hashlib.sha1,
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"sha256": hashlib.sha256,
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"sha512": hashlib.sha512,
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}
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config = config.split()
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hashers = {
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k: v()
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for k, v in known.items()
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if k in [x.split("/")[0].rstrip("b") for x in known]
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}
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crc32 = 0 if "crc32" in config else None
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with open(fsenc(sys.argv[1]), "rb", 512 * 1024) as f:
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while True:
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buf = f.read(64 * 1024)
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if not buf:
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break
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for x in hashers.values():
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x.update(buf)
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if crc32 is not None:
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crc32 = zlib.crc32(buf, crc32)
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ret = {}
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for s in config:
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alg = s.split("/")[0]
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b64 = alg.endswith("b")
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alg = alg.rstrip("b")
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if alg in hashers:
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v = hashers[alg].digest()
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elif alg == "crc32":
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v = crc32
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if v < 0:
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v &= 2 ** 32 - 1
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v = struct.pack(">L", v)
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else:
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raise Exception("what is {}".format(s))
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if "/" in s:
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v = v[: int(int(s.split("/")[1]) / 8)]
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if b64:
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v = base64.b64encode(v).decode("ascii").rstrip("=")
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else:
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try:
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v = v.hex()
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except:
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import binascii
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v = binascii.hexlify(v)
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ret[s] = v
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print(json.dumps(ret, indent=4))
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if __name__ == "__main__":
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main()
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