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thiagu_com |
#############################################################################
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## This code is free software; you can redistribute it and/or
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## modify it under the terms of the GNU Lesser General Public
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## License as published by the Free Software Foundation; either
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## version 2.1 of the License, or (at your option) any later version.
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##
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## This code is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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## Lesser General Public License for more details.
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##
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## This perl script will parse data in a file, do manchester encoding
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## / decoding and write the encoded / decoded data in another file.
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## This file can be executed from command line. The syntax of the
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## command for encoding is "perl man_encode_decode.pl E". 'E' as an
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## argument in the command denotes encoding. The syntax of the
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## command for decoding is "perl man_encode_decode.pl D". 'D' as an
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## argument in the command denotes decoding.
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##
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## Revision Date Author Comment
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## ######## ########## #################### ################
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## 1.0 26/06/09 M. Thiagarajan Initial revision
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##
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## Future revisions tracked in Subversion at OpenCores.org
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## under the manchesterwireless project
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#############################################################################
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#!usr/local/bin/perl
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$IP_FILE = "./data_ip.txt";
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$OP_FILE = "./data_op.txt";
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$OPERATION = @ARGV[0];
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open ($DATA_IP, "$IP_FILE") || die ("\n***Error: Input file not found");
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!(-e $OP_FILE) || unlink $OP_FILE; #If file found, delete it
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open ($DATA_OP,">>".$OP_FILE) || die ("\n***Error: Cannot create output file. Cehck folder permissions.\n");
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if ($OPERATION eq "E") #E - Encode
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{
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$DATA = <$DATA_IP>;
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chop ($DATA);
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while ($DATA ne "")
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{
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$SIZE = length ($DATA);
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while ($SIZE > 0)
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{
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$IPBIT = substr ($DATA,($SIZE-1),1);
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$DATA =~ s/.$//;
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$SIZE--;
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if ($IPBIT == 0)
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{$OPBIT = "10";}
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elsif ($IPBIT == 1)
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{$OPBIT = "01";}
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print $DATA_OP "$OPBIT";
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}
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print $DATA_OP "\n";
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$DATA = <$DATA_IP>;
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chop ($DATA);
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#print ($DATA,"\n");
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}
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}
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elsif ($OPERATION eq "D")
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{
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$DATA = <$DATA_IP>;
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chop ($DATA);
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while ($DATA ne "")
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{
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$SIZE = length ($DATA);
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if (($SIZE % 2) != 0)
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{
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print ("\n***Error: Improper Data width\n") && die;
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}
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else
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{
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while ($SIZE > 0)
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{
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$IPBIT = substr ($DATA,($SIZE-2),2);
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$DATA =~ s/..$//;
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$SIZE=$SIZE-2;
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if ($IPBIT == 10)
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{$OPBIT = "0";}
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elsif ($IPBIT == 01)
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{$OPBIT = "1";}
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print $DATA_OP "$OPBIT";
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}
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}
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print $DATA_OP "\n";
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$DATA = <$DATA_IP>;
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chop ($DATA);
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}
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}
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else
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{
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print "\n***Error: No Valid arguments in the command\n";
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print "***Valid arguments are - 'E' for Encoding; 'D' for Decoding\n\n";
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print "***Usage Example:\t\"perl man_encode_decode.pl E\"\n";
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}
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