Ebcdic.py

Script

#!/usr/bin/env python

"""

ASCII <=> EBCDIC conversion functions. The arrays were taken from the Snippets collection.
Script:

"""

a2e = [
      0,  1,  2,  3, 55, 45, 46, 47, 22,  5, 37, 11, 12, 13, 14, 15,
     16, 17, 18, 19, 60, 61, 50, 38, 24, 25, 63, 39, 28, 29, 30, 31,
     64, 79,127,123, 91,108, 80,125, 77, 93, 92, 78,107, 96, 75, 97,
    240,241,242,243,244,245,246,247,248,249,122, 94, 76,126,110,111,
    124,193,194,195,196,197,198,199,200,201,209,210,211,212,213,214,
    215,216,217,226,227,228,229,230,231,232,233, 74,224, 90, 95,109,
    121,129,130,131,132,133,134,135,136,137,145,146,147,148,149,150,
    151,152,153,162,163,164,165,166,167,168,169,192,106,208,161,  7,
     32, 33, 34, 35, 36, 21,  6, 23, 40, 41, 42, 43, 44,  9, 10, 27,
     48, 49, 26, 51, 52, 53, 54,  8, 56, 57, 58, 59,  4, 20, 62,225,
     65, 66, 67, 68, 69, 70, 71, 72, 73, 81, 82, 83, 84, 85, 86, 87,
     88, 89, 98, 99,100,101,102,103,104,105,112,113,114,115,116,117,
    118,119,120,128,138,139,140,141,142,143,144,154,155,156,157,158,
    159,160,170,171,172,173,174,175,176,177,178,179,180,181,182,183,
    184,185,186,187,188,189,190,191,202,203,204,205,206,207,218,219,
    220,221,222,223,234,235,236,237,238,239,250,251,252,253,254,255
    ]

e2a = [
      0,  1,  2,  3,156,  9,134,127,151,141,142, 11, 12, 13, 14, 15,
     16, 17, 18, 19,157,133,  8,135, 24, 25,146,143, 28, 29, 30, 31,
    128,129,130,131,132, 10, 23, 27,136,137,138,139,140,  5,  6,  7,
    144,145, 22,147,148,149,150,  4,152,153,154,155, 20, 21,158, 26,
     32,160,161,162,163,164,165,166,167,168, 91, 46, 60, 40, 43, 33,
     38,169,170,171,172,173,174,175,176,177, 93, 36, 42, 41, 59, 94,
     45, 47,178,179,180,181,182,183,184,185,124, 44, 37, 95, 62, 63,
    186,187,188,189,190,191,192,193,194, 96, 58, 35, 64, 39, 61, 34,
    195, 97, 98, 99,100,101,102,103,104,105,196,197,198,199,200,201,
    202,106,107,108,109,110,111,112,113,114,203,204,205,206,207,208,
    209,126,115,116,117,118,119,120,121,122,210,211,212,213,214,215,
    216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,
    123, 65, 66, 67, 68, 69, 70, 71, 72, 73,232,233,234,235,236,237,
    125, 74, 75, 76, 77, 78, 79, 80, 81, 82,238,239,240,241,242,243,
     92,159, 83, 84, 85, 86, 87, 88, 89, 90,244,245,246,247,248,249,
     48, 49, 50, 51, 52, 53, 54, 55, 56, 57,250,251,252,253,254,255
]

#---------------------------------------------------------------------

def AsciiToEbcdic(s):
    '''Return the ASCII string str in EBCDIC form.
    '''
    if type(s) != type(""):
        raise "Bad data", "Expected a string argument"

    if len(s) == 0:  return s

    new = ""

    for i in xrange(len(s)):
        new += chr(a2e[ord(s[i])])

    return new

#---------------------------------------------------------------------

def EbcdicToAscii(s):
    if type(s) != type(""):
        raise "Bad data", "Expected a string argument"

    if len(s) == 0:  return s

    new = ""

    for i in xrange(len(s)):
        new += chr(e2a[ord(s[i])])

    return new

#---------------------------------------------------------------------

def test():
    example = "The dog jumped over the lazy brown fox in 1.234567890 seconds"

    ebcdic = AsciiToEbcdic(example)

    print ebcdic

    result = EbcdicToAscii(ebcdic)

    if example != result:
        raise "Conversion test failed"

#---------------------------------------------------------------------

if __name__ == '__main__':
    test()

#---------------------------------------------------------------------