1 | @rem = '--*-Perl-*-- |
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2 | @echo off |
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3 | perl -x -S %0 %1 %2 %3 %4 %5 %6 %7 %8 %9 |
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4 | goto endofperl |
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5 | @rem '; |
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6 | #!perl |
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7 | # |
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8 | # Add checksum byte to ROM image |
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9 | # |
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10 | # Use a size of 0 to skip this script entirely (file is not modified) |
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11 | # |
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12 | # On Windows, this file can be renamed to a batch file and invoked directly (for example, "c:\>checksum file size") |
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13 | # |
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14 | |
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15 | # |
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16 | # XTIDE Universal BIOS and Associated Tools |
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17 | # Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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18 | # |
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19 | # This program is free software; you can redistribute it and/or modify |
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20 | # it under the terms of the GNU General Public License as published by |
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21 | # the Free Software Foundation; either version 2 of the License, or |
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22 | # (at your option) any later version. |
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23 | # |
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24 | # This program is distributed in the hope that it will be useful, |
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25 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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26 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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27 | # GNU General Public License for more details. |
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28 | # Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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29 | # |
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30 | |
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31 | ($ARGV[0] ne "" && $ARGV[1] ne "") || die "usage: checksum filename size\n"; |
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32 | |
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33 | $desiredSize = int($ARGV[1]); |
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34 | |
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35 | if( $desiredSize == 0 ) |
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36 | { |
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37 | exit( 0 ); |
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38 | } |
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39 | |
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40 | open FILE, "+<".$ARGV[0] || die "file not found\n"; |
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41 | binmode FILE; |
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42 | $cs = 0; |
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43 | $last = 0; |
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44 | $bytes = 0; |
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45 | while( ($n = read( FILE, $d, 1 )) != 0 ) |
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46 | { |
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47 | $cs = $cs + ord($d); |
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48 | $cs = $cs % 256; |
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49 | $bytes = $bytes + 1; |
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50 | } |
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51 | $oldBytes = $bytes; |
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52 | |
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53 | if( $bytes > $desiredSize - 1 ) |
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54 | { |
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55 | die "ERROR: image is bigger than ".($desiredSize-1).": $bytes\n"; |
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56 | } |
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57 | |
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58 | $fixzero = chr(0); |
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59 | while( $bytes < $desiredSize - 1 ) |
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60 | { |
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61 | print FILE $fixzero; |
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62 | $bytes++; |
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63 | } |
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64 | |
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65 | $fixl = ($cs == 0 ? 0 : 256 - $cs); |
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66 | $fix = chr($fixl); |
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67 | print FILE $fix; |
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68 | |
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69 | close FILE; |
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70 | |
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71 | open FILE, "<".$ARGV[0]; |
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72 | binmode FILE; |
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73 | $cs = 0; |
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74 | $newBytes = 0; |
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75 | while( ($n = read( FILE, $d, 1 )) != 0 ) |
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76 | { |
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77 | $cs = $cs + ord($d); |
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78 | $cs = $cs % 256; |
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79 | $newBytes++; |
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80 | } |
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81 | $cs == 0 || die "Checksum verification failed\n"; |
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82 | |
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83 | print "checksum: ".$ARGV[0].": $oldBytes bytes before, $newBytes bytes after\n"; |
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84 | |
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85 | __DATA__ |
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86 | :endofperl |
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