Binary file to C int array in ruby

convert.rb

#!/bin/ruby

require "fileutils"

MAX_NUMBERS_PER_LINE = 4

if ARGV.length != 1
        puts "./convert.rb path/to/filename > output.c"
        abort
end

filename = ARGV[0]

unless File.exists?(filename)
        puts "#{filename} was not found :C"
        abort
end

if File.size(filename) < 4
        puts "#{filename} size should not be less than 4 bytes."
        abort
end

regs = File.read(filename).unpack("I<*")

# Start the array definition
output = "int regs[#{regs.length}] = {"

# Output each integer as an hexadecimal value
numbers_per_line = 0
regs.each {|int|
        output << "\n\t" if (numbers_per_line == 0)
        output << ("0x%08x, " % int)
        numbers_per_line += 1
        # We could warp power of 2 with &=
        # But let's avoid smart-ass technics on snippets
        numbers_per_line = 0 if numbers_per_line == MAX_NUMBERS_PER_LINE
}

# Remove the last comma
output[output.rindex(","), 1] = ""

# Closes the array definition
output << "\n};\n"

# Output the array definition we generated
puts output