class Xlsxrb::Ooxml::Cfb::Reader

# File lib/xlsxrb/ooxml/cfb.rb, line 63
def self.cfb?(data)
  return false if data.nil? || data.bytesize < 8

  data[0, 8] == MAGIC
end

# File lib/xlsxrb/ooxml/cfb.rb, line 69
def initialize(data)
  @data = data.b
  raise Xlsxrb::Error, "Invalid CFB file header signature" unless Reader.cfb?(@data)

  parse_header
  build_fat
  parse_directory
  load_mini_stream
end

# File lib/xlsxrb/ooxml/cfb.rb, line 83
def read_stream(name)
  entry = @entries.find { |e| e.name.casecmp?(name) && e.stream? }
  return nil unless entry

  if entry.size < @mini_cutoff && @mini_stream && !@minifat.empty?
    read_mini_stream_data(entry.start_sector, entry.size)
  else
    read_regular_stream_data(entry.start_sector, entry.size)
  end
end

# File lib/xlsxrb/ooxml/cfb.rb, line 79
def stream_names
  @entries.select(&:stream?).map(&:name)
end