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 # frozen_string_literal: true
 #
 # Copyright (C) 2015-2016 Harald Sitter <sitter@kde.org>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
 # License as published by the Free Software Foundation; either
 # version 2.1 of the License, or (at your option) version 3, or any
 # later version accepted by the membership of KDE e.V. (or its
 # successor approved by the membership of KDE e.V.), which shall
 # act as a proxy defined in Section 6 of version 3 of the license.
 #
 # This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 require 'insensitive_hash/minimal'
 
 require_relative 'deb822'
 
 module Debian
   # Debian .changes parser
   class Changes < Deb822
     # FIXME: lazy read automatically when accessing fields
     attr_reader :fields
 
     File = Struct.new(:md5, :size, :section, :priority, :name)
     Checksum = Struct.new(:sum, :size, :file_name)
 
     # FIXME: pretty sure that should be in the base
     def initialize(file)
       @file = file
       @fields = InsensitiveHash.new
     end
 
     def parse!
       lines = ::File.new(@file).readlines
 
       # Source Paragraph
       fields = {
         mandatory: %w(format date source binary architecture version distribution maintainer description changes checksums-sha1 checksums-sha256 files),
         relationship: %w(),
         foldable: %w(binary) + %w(),
         multiline: %w(description changes checksums-sha1 checksums-sha256 files)
       }
       @fields = parse_paragraph(lines, fields)
 
       if @fields
         if @fields['files']
           # Mangle list fields into structs.
           @fields['files'] = parse_types(@fields['files'], File)
           %w(checksums-sha1 checksums-sha256).each do |key|
             @fields[key] = parse_types(@fields[key], Checksum)
           end
         end
       end
 
       # TODO: Strip custom fields and add a Control::flags_for(entry) method.
 
       # FIXME: signing verification not implemented
       #   this code works; needs to be somewhere generic
       #   also needs to rescue GPGME::Error::NoData
       #   in case the file is not signed
       # crypto = GPGME::Crypto.new
       # results = []
       # crypto.verify(data) do |signature|
       #   results << signature.valid?
       #
       # !results.empty? && results.all?
     end
 
     private
 
     def parse_types(lines, klass)
       lines.split($/).collect do |line|
         klass.new(*line.split(' '))
       end
     end
   end
 end