Revision 33bbd1de pc-bios/optionrom/signrom.sh

b/pc-bios/optionrom/signrom.sh
31 31 
size=$(( $x * 512 - 1 ))
32 32 

  		





  33
  33
  
    
# now get the checksum


  		





  34
  
  
    
nums=`od -A n -t u1 -v "$1"`


  		





  
  34
  
    
nums=`od -A n -t u1 -v -N $size "$1"`


  		





  35
  35
  
    
for i in ${nums}; do


  		





  36
  36
  
    
    # add each byte's value to sum


  		





  37
  
  
    
    sum=`expr $sum + $i`


  		





  
  37
  
    
    sum=`expr \( $sum + $i \) % 256`


  		





  38
  38
  
    
done


  		





  39
  39
  
    

  		





  40
  
  
    
sum=$(( $sum % 256 ))


  		





  41
  
  
    
sum=$(( 256 - $sum ))


  		





  
  40
  
    
sum=$(( (256 - $sum) % 256 ))


  		





  42
  41
  
    
sum_octal=$( printf "%o" $sum )


  		





  43
  42
  
    

  		





  44
  43
  
    
# and write the output file


  		












Also available in:
  Unified diff