Minecraft Asset Extraction

gistfile1.rb

#
# This is the ruby script I used the organize the Minecraft assets in a 
# human friendly format for my final project in MMS 172
#

require "json"
require "fileutils"

source = "#{Dir.home}/Library/Application Support/minecraft/assets"
destination = File.dirname(__FILE__)
manifest_path = "#{source}/indexes/1.8.json"

manifest = JSON.load(File.read(manifest_path))

manifest["objects"].each do |obj|
  dst = File.join(destination, obj[0])
  FileUtils.mkdir_p(File.dirname(dst))
  src = File.join(source, "objects", obj[1]['hash'][0,2], obj[1]['hash'])
  puts "Copying #{dst} from #{src}"
  size = File.copy_stream(src, dst)
  if (size != obj[1]['size']) 
    raise "Expected to copy #{obj[1]['size']} bytes. Copied #{size} bytes"
  end
end