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Improve speed by searchign in byte string & parameterized decoding #1

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Improve speed by searchign in byte string & parameterized decoding #1

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e28ad45
Search in binary string
ciis0 Nov 8, 2023
937cb77
more args
ciis0 Nov 8, 2023
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16 changes: 11 additions & 5 deletions src/parse_mnesia.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,9 @@
parser.add_argument('-file', help='choose file to parse', default='no file')
parser.add_argument('-chunk', help='byte count for each file chunk to read (default=1028)', default=1028)
parser.add_argument('-o', help='filename (no extension) for file; print for print to terminal', default='print')
parser.add_argument('-be', help='byte endianess for lenght, e.g. big, little', default="big")
parser.add_argument("-e", help="encoding, e.g. utf-8, ascii", default="utf-8")
parser.add_argument("-ee", help="encoding errors, e.g. strict, ignore", default="strict")
args = parser.parse_args()

if args.file == 'no file':
Expand All @@ -32,6 +35,10 @@

fileName = args.file

endianness = args.be
encoding = args.e
encoding_errors = args.ee

#fileName='/usr/local/var/lib/rabbitmq/mnesia/rabbit/msg_stores/vhosts/2KVL28AS0JEHD0UYQNDTX3QIO/queues/7NJWTXU5MSR21TJGJEOA2NPC2/0.idx'
print('Reading file: ' + fileName)

Expand All @@ -48,19 +55,18 @@ def convert_hex(string):


def extractString(data, hexString, byteLengthHex):
hexdata=convert_hex(data)
dataPos=hexdata.find(hexString.upper())
dataPos = data.find(bytes.fromhex(hexString))
if dataPos == -1:
found=False
unescapedData=''
endPosition = -1
else:
found=True
startofMatch=round(dataPos/2)
startofMatch=round(dataPos)
recordSize = data[startofMatch+byteLengthHex:startofMatch+byteLengthHex+2]
rdqEntryLength = int(convert_hex(recordSize), 16)
rdqEntryLength = int.from_bytes(recordSize, endianness)
dataMessage = data[startofMatch+byteLengthHex+2: startofMatch+byteLengthHex+2+rdqEntryLength]
unescapedData = dataMessage.decode('ascii', 'ignore')
unescapedData = dataMessage.decode(encoding, encoding_errors)
endPosition = startofMatch+byteLengthHex+2+rdqEntryLength
return {"string": unescapedData, "endpos": endPosition, 'found':found}

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