Simple deserializer for Python

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Article Metadata

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Tested with

Devices(s): Nokia N95 8GB

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Compatibility

Platform(s): S60 3rd Edition

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Platform Security

Capabilities: )

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Article

Keywords: struct

Created: lpvalente (03 Mar 2009)

Last edited: hamishwillee (24 Jun 2011)

Introduction

This snippet represents a simple deserializer of some basic Python types.

Source Code

import struct
 
class Deserializer:
    __file = None
    __open = False
 
    def __readBasicDataType (self, which):
        assert self.__open
        d = self.__file.read (struct.calcsize(which))
        n = struct.unpack (which, d)
        return n [0]
 
 
    def __init__ (self, filename):
        self.__file = file (filename, "rb")
        self.__open = True
 
    def readLong (self):
        return self.__readBasicDataType ('l')
 
    def readUlong (self):
        return self.__readBasicDataType ('L')    
 
    def readByte (self):
        return self.__readBasicDataType ('b')
 
    def readFloat (self):
        return self.__readBasicDataType ('f')
 
    def readDouble (self):
        return self.__readBasicDataType ('d')
 
    def readBytesAsString (self, num):
        assert self.__open
        return self.__file.read (num)
 
    def close (self):
        assert self.__open
        self.__file.close()
        self.__open = False