Show Tar archive files

files.rb

#!/bin/ruby

require 'faraday'

url = 'http://domain/somefile.tar'

conn = Faraday.new

header_response = conn.head(url)
total_size = header_response.env[:response_headers]["content-length"].to_i
puts "Size: #{total_size}"

block = 512

startb = 0
endb = block * 4

loop do
    break if startb > total_size
    endb = total_size if endb > total_size
    conn.headers = {'Range' => "bytes=#{startb}-#{endb}"}
    response = conn.get(url)
    data = response.body
    0.upto(data.length / block - 1) do |i|
        startb += block
        file_start = startb
        filename = data[i * block, 100].to_s
        file_size = data[i * block + 124, 12].to_i(8)
        startb += (file_size / block.to_f).ceil * block
        endb = startb + block
        puts "#{filename} : #{file_start}-#{endb} (#{file_size})"
        if file_size.zero? and i.zero?
            endb += block * 2
        elsif not file_size.zero?
            break
        end
    end
end