| 1 |
ninoborges |
8 |
"""
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| 2 |
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HexByteConversion
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| 3 |
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| 4 |
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Convert a byte string to it's hex representation for output or visa versa.
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ByteToHex converts byte string "\xFF\xFE\x00\x01" to the string "FF FE 00 01"
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HexToByte converts string "FF FE 00 01" to the byte string "\xFF\xFE\x00\x01"
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"""
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| 10 |
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#-------------------------------------------------------------------------------
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def ByteToHex( byteStr ):
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"""
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Convert a byte string to it's hex string representation e.g. for output.
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| 15 |
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"""
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# Uses list comprehension which is a fractionally faster implementation than
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# the alternative, more readable, implementation below
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#
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# hex = []
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# for aChar in byteStr:
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# hex.append( "%02X " % ord( aChar ) )
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#
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# return ''.join( hex ).strip()
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return ''.join( [ "%02X " % ord( x ) for x in byteStr ] ).strip()
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#-------------------------------------------------------------------------------
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| 30 |
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def HexToByte( hexStr ):
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"""
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Convert a string hex byte values into a byte string. The Hex Byte values may
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or may not be space separated.
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"""
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# The list comprehension implementation is fractionally slower in this case
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#
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# hexStr = ''.join( hexStr.split(" ") )
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# return ''.join( ["%c" % chr( int ( hexStr[i:i+2],16 ) ) \
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# for i in range(0, len( hexStr ), 2) ] )
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bytes = []
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hexStr = ''.join( hexStr.split(" ") )
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| 45 |
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for i in range(0, len(hexStr), 2):
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bytes.append( chr( int (hexStr[i:i+2], 16 ) ) )
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return ''.join( bytes )
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#-------------------------------------------------------------------------------
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# test data - different formats but equivalent data
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__hexStr1 = "FFFFFF5F8121070C0000FFFFFFFF5F8129010B"
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__hexStr2 = "FF FF FF 5F 81 21 07 0C 00 00 FF FF FF FF 5F 81 29 01 0B"
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__byteStr = "\xFF\xFF\xFF\x5F\x81\x21\x07\x0C\x00\x00\xFF\xFF\xFF\xFF\x5F\x81\x29\x01\x0B"
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| 56 |
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| 57 |
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| 58 |
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if __name__ == "__main__":
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| 59 |
nino.borges |
744 |
print("\nHex To Byte and Byte To Hex Conversion")
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| 60 |
ninoborges |
8 |
|
| 61 |
nino.borges |
744 |
print("Test 1 - ByteToHex - Passed: ", ByteToHex( __byteStr ) == __hexStr2)
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| 62 |
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print("Test 2 - HexToByte - Passed: ", HexToByte( __hexStr1 ) == __byteStr)
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| 63 |
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print("Test 3 - HexToByte - Passed: ", HexToByte( __hexStr2 ) == __byteStr)
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| 64 |
ninoborges |
8 |
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| 65 |
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# turn a non-space separated hex string into a space separated hex string!
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| 66 |
nino.borges |
744 |
print("Test 4 - Combined - Passed: ", \
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| 67 |
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ByteToHex( HexToByte( __hexStr1 ) ) == __hexStr2)
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