mirror of https://github.com/mgcaret/of816.git
35 lines
891 B
Ruby
Executable File
35 lines
891 B
Ruby
Executable File
#!/usr/bin/ruby
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def usage
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abort("Usage: #{$0} <outfile> <infile> [<infile> ...]")
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end
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def set_file_header(data, file_no, name, offset, size)
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f_name = file_no*16+5
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f_offs = f_name+12
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f_size = f_offs+2
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name.bytes.each_with_index {|b, i| data[f_name+i] = b}
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data[f_offs] = offset & 0xFF
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data[f_offs+1] = (offset >> 8) & 0xFF
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data[f_size] = size & 0xFF
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data[f_size+1] = (size >> 8) & 0xFF
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end
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outfile = ARGV.shift || usage
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usage if ARGV.empty?
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abort("Too many files (>15)") if ARGV.count > 15
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out_bytes = [0x4D, 0x47, 0x46, 0x53]
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out_bytes += [ARGV.count] # file count
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out_bytes += (([0x20] * 12)+([0x00]*4)) * ARGV.count # header for each file
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ARGV.each_with_index do |file, i|
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data = File.read(file).bytes
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set_file_header(out_bytes, i, File.basename(file)[0,12], out_bytes.count, data.count)
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out_bytes += data
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end
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File.write(outfile, out_bytes.map(&:chr).join)
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