93 lines
2.5 KiB
Python
93 lines
2.5 KiB
Python
import sys
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import json
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# pip2 install msgpack-python
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import msgpack
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import zlib
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import os
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import logging
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from Crypto.Cipher import AES
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ext = ".gz"
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SWAG = '\xde\xe2\x11\x15VVC\xf2\x8ep\xd7\xe4\x87\x8d,9'
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def compress_json(in_file, out_file):
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logging.debug("compressing %s -> %s", in_file, out_file)
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errors = 0
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good = []
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last_can_time = 0
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with open(in_file, 'r') as inf:
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for ln in inf:
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ln = ln.rstrip()
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if not ln: continue
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try:
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ll = json.loads(ln)
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except ValueError:
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errors += 1
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continue
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if ll is None or ll[0] is None:
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continue
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if ll[0][1] == 1:
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# no CAN in hex
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ll[1][2] = ll[1][2].decode("hex")
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# relativize the CAN timestamps
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this_can_time = ll[1][1]
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ll[1] = [ll[1][0], this_can_time - last_can_time, ll[1][2]]
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last_can_time = this_can_time
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good.append(ll)
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logging.debug("compressing %s -> %s, read done", in_file, out_file)
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data = msgpack.packb(good)
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data_compressed = zlib.compress(data)
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# zlib doesn't care about this
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data_compressed += "\x00" * (16 - len(data_compressed)%16)
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aes = AES.new(SWAG, AES.MODE_CBC, "\x00"*16)
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data_encrypted = aes.encrypt(data_compressed)
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with open(out_file, "wb") as outf:
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outf.write(data_encrypted)
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logging.debug("compressing %s -> %s, write done", in_file, out_file)
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return errors
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def decompress_json_internal(data_encrypted):
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aes = AES.new(SWAG, AES.MODE_CBC, "\x00"*16)
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data_compressed = aes.decrypt(data_encrypted)
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data = zlib.decompress(data_compressed)
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msgs = msgpack.unpackb(data)
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good = []
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last_can_time = 0
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for ll in msgs:
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if ll[0][1] == 1:
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# back into hex
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ll[1][2] = ll[1][2].encode("hex")
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# derelativize CAN timestamps
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last_can_time += ll[1][1]
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ll[1] = [ll[1][0], last_can_time, ll[1][2]]
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good.append(ll)
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return good
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def decompress_json(in_file, out_file):
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logging.debug("decompressing %s -> %s", in_file, out_file)
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f = open(in_file)
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data_encrypted = f.read()
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f.close()
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good = decompress_json_internal(data_encrypted)
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out = '\n'.join(map(lambda x: json.dumps(x), good)) + "\n"
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logging.debug("decompressing %s -> %s, writing", in_file, out_file)
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f = open(out_file, 'w')
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f.write(out)
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f.close()
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logging.debug("decompressing %s -> %s, write finished", in_file, out_file)
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if __name__ == "__main__":
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for dat in sys.argv[1:]:
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print(dat)
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compress_json(dat, "/tmp/out"+ext)
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decompress_json("/tmp/out"+ext, "/tmp/test")
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os.system("diff "+dat+" /tmp/test")
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