Subject: Re: EBCDIC translation? - DN [1]
Al Christians <achrist@easystreet.com> - 09 Mar 2000 - comp.lang.python
Steve Moon wrote:
>
> Hi,
>
> I have several binary EBCDIC files from a mainframe I need to read. I
> would like to use Python. Are there any libraries available for this?
>
> A good start would be an ASCII <--> EBCDIC translation.
>
I doubt that the Ebcdic and Ascii characters cover exactly the same set.
The following approximation is what I found laying about about here
(no guarantees):
Al
----------------------------------------------------------------------
import string
def ebcdicPlusStripperFunc():
return string.maketrans( 'ABCDEFGHI{', '1234567890' )
def ebcdicMinusStripperFunc():
return string.maketrans( 'JKLMNOPQR}', '1234567890' )
def ebcdicMinusAdderFunc():
return string.maketrans( '1234567890','JKLMNOPQR}' )
def asciiMinusStripperFunc():
return string.maketrans( chr(33) + chr(34) + chr(35)
+ chr(36) + chr(37) + chr(38)
+ chr(39) + chr(40) + chr(41)
+ chr(32), '1234567890' )
ebcdicPlusStripperString = ebcdicPlusStripperFunc()
ebcdicMinusStripperString = ebcdicMinusStripperFunc()
asciiMinusStripperString = asciiMinusStripperFunc()
ebcdicMinusAdderString = ebcdicMinusAdderFunc()
def stripSign( s ):
signByte = s[-1]
if ( signByte >= '0' ) and ( signByte <= '9' ):
return ( s, 1 )
x = string.translate( signByte, ebcdicPlusStripperString )
if x != signByte:
return ( s[:-1] + x, 1 )
x = string.translate( signByte, ebcdicMinusStripperString )
if x != signByte:
return ( s[:-1] + x, -1 )
x = string.translate( signByte, asciiMinusStripperString )
if x != signByte:
return ( s[:-1] + x, -1 )
else:
return ( s, 1 )
def pic9Decimal( s, decimals ):
( s, theSign ) = stripSign( s )
x = float( s + '.0' )
denominator = 1.0
for i in range( decimals ):
denominator = denominator * 10.0
return theSign * x / denominator
def pic9Integer( s ):
( s, theSign ) = stripSign( s )
return theSign * int( s )
def toEbcdicTranslaterFunc():
asciiToEbcdicIntegers = [
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
]
asciiToEbcdicChars = []
for i in asciiToEbcdicIntegers:
asciiToEbcdicChars.append( chr(i) )
return string.join( asciiToEbcdicChars, '' )
toEbcdicTranslater = toEbcdicTranslaterFunc()
def toEbcdic( s ):
return string.translate( s, toEbcdicTranslater )
def toAsciiTranslaterFunc():
ebcdicToAsciiIntegers = [
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
]
ebcdicToAsciiChars = []
for i in ebcdicToAsciiIntegers:
ebcdicToAsciiChars.append( chr(i) )
return string.join( ebcdicToAsciiChars, '' )
toAsciiTranslater = toAsciiTranslaterFunc()
def toAscii( s ):
return string.translate( s, toAsciiTranslater )
def addEbcdicMinusZone( s ):
return s[:-1] + string.translate( s[-1], ebcdicMinusAdderString )
def makeEbcdicPic9Integer( x, width ):
try:
if x < 0:
isMinus = 1
x = -x
else:
isMinus = 0
answer = "%015d" % (x,)
answer = answer[-width:]
if isMinus:
return addEbcdicMinusZone( answer )
else:
return answer
except:
print "Error Formatting Ebcdic Integer", `x`, `width`
def makeEbcdicPic9Decimal( x, width, decimals ):
try:
if x < 0:
isMinus = 1
x = -x
else:
isMinus = 0
answer = "%031.15f" % (x,)
answer = answer[15-width+decimals:15] + answer[16:16+decimals]
if isMinus:
return addEbcdicMinusZone( answer )
else:
return answer
except:
print "Error Formatting Ebcdic Decimal",`x`,`width`,`decimals`
Last modified
2000-07-20
2000-07-20
(195.108.246.52)
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