my %headers = (
    0  => "file-type", 
    1  => "file-size-in-bytes",    
    2  => "must-be-0",        
    3  => "must-be-0",          
    4  => "offset-to-raster-in-bytes",            
    5  => "size-of-following-header-in-bytes", 
    6  => "width-in-pixels",            
    7  => "height-in-pixels",           
    8  => "device-planes",               
    9  => "bits-per-pixel",              
    10 => "type-of-compression",        
    11 => "raster-size-in-bytes",         
    12 => "horizontal-pixels-per-meter", 
    13 => "vertical-pixels-per-meter",   
    14 => "number-of-colors-used",       
    15 => "number-of-important-colors",
);
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And this would be this week's winner for "most egregious use of a hash". Why isn't that just an array?