MspackRb

require 'mspack'

# Extract all files to disk
dcom = Mspack::ChmDecompressor.new
header = dcom.open('path/to/a/chm/file')
header.each_file { |file| dcom.extract(file, '/some/folder') }
dcom.close(header)

# Extract a specific file by name
fast_open_header = dcom.fast_open('path/to/a/chm/file')
file = dcom.fast_find(fast_open_header, '/index.html')
dcom.extract(file, '~/some/folder') unless file.nil?

# Get extracted file bytes as an array
dcom.extract(file) { |data_chunk| do_something_with_bin_string(data_chunk) }

# check last error
p 'w00t' if dcom.last_error == :ok