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Edit File : old.rb \| Size : 3.63 KB
# frozen_string_literal: true #-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ ## # The format class knows the guts of the ancient .gem file format and provides # the capability to read such ancient gems. # # Please pretend this doesn't exist. class Gem::Package::Old < Gem::Package undef_method :spec= ## # Creates a new old-format package reader for +gem+. Old-format packages # cannot be written. def initialize(gem, security_policy) require 'fileutils' require 'zlib' Gem.load_yaml @contents = nil @gem = gem @security_policy = security_policy @spec = nil end ## # A list of file names contained in this gem def contents verify return @contents if @contents @gem.with_read_io do \|io\| read_until_dashes io # spec header = file_list io @contents = header.map {\|file\| file['path'] } end end ## # Extracts the files in this package into +destination_dir+ def extract_files(destination_dir) verify errstr = "Error reading files from gem" @gem.with_read_io do \|io\| read_until_dashes io # spec header = file_list io raise Gem::Exception, errstr unless header header.each do \|entry\| full_name = entry['path'] destination = install_location full_name, destination_dir file_data = String.new read_until_dashes io do \|line\| file_data << line end file_data = file_data.strip.unpack("m")[0] file_data = Zlib::Inflate.inflate file_data raise Gem::Package::FormatError, "#{full_name} in #{@gem} is corrupt" if file_data.length != entry['size'].to_i FileUtils.rm_rf destination FileUtils.mkdir_p File.dirname(destination), :mode => dir_mode && 0755 File.open destination, 'wb', file_mode(entry['mode']) do \|out\| out.write file_data end verbose destination end end rescue Zlib::DataError raise Gem::Exception, errstr end ## # Reads the file list section from the old-format gem +io+ def file_list(io) # :nodoc: header = String.new read_until_dashes io do \|line\| header << line end Gem::SafeYAML.safe_load header end ## # Reads lines until a "---" separator is found def read_until_dashes(io) # :nodoc: while (line = io.gets) && line.chomp.strip != "---" do yield line if block_given? end end ## # Skips the Ruby self-install header in +io+. def skip_ruby(io) # :nodoc: loop do line = io.gets return if line.chomp == '__END__' break unless line end raise Gem::Exception, "Failed to find end of Ruby script while reading gem" end ## # The specification for this gem def spec verify return @spec if @spec yaml = String.new @gem.with_read_io do \|io\| skip_ruby io read_until_dashes io do \|line\| yaml << line end end begin @spec = Gem::Specification.from_yaml yaml rescue YAML::SyntaxError raise Gem::Exception, "Failed to parse gem specification out of gem file" end rescue ArgumentError raise Gem::Exception, "Failed to parse gem specification out of gem file" end ## # Raises an exception if a security policy that verifies data is active. # Old format gems cannot be verified as signed. def verify return true unless @security_policy raise Gem::Security::Exception, 'old format gems do not contain signatures and cannot be verified' if @security_policy.verify_data true end end Back

Edit File : old.rb | Size : 3.63 KB

# frozen_string_literal: true
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

##
# The format class knows the guts of the ancient .gem file format and provides
# the capability to read such ancient gems.
#
# Please pretend this doesn't exist.

class Gem::Package::Old < Gem::Package
  undef_method :spec=

##
  # Creates a new old-format package reader for +gem+.  Old-format packages
  # cannot be written.

def initialize(gem, security_policy)
    require 'fileutils'
    require 'zlib'
    Gem.load_yaml

@contents        = nil
    @gem             = gem
    @security_policy = security_policy
    @spec            = nil
  end

##
  # A list of file names contained in this gem

def contents
    verify

return @contents if @contents

@gem.with_read_io do |io|
      read_until_dashes io # spec
      header = file_list io

@contents = header.map {|file| file['path'] }
    end
  end

##
  # Extracts the files in this package into +destination_dir+

def extract_files(destination_dir)
    verify

errstr = "Error reading files from gem"

@gem.with_read_io do |io|
      read_until_dashes io # spec
      header = file_list io
      raise Gem::Exception, errstr unless header

header.each do |entry|
        full_name = entry['path']

destination = install_location full_name, destination_dir

file_data = String.new

read_until_dashes io do |line|
          file_data << line
        end

file_data = file_data.strip.unpack("m")[0]
        file_data = Zlib::Inflate.inflate file_data

raise Gem::Package::FormatError, "#{full_name} in #{@gem} is corrupt" if
          file_data.length != entry['size'].to_i

FileUtils.rm_rf destination

FileUtils.mkdir_p File.dirname(destination), :mode => dir_mode && 0755

File.open destination, 'wb', file_mode(entry['mode']) do |out|
          out.write file_data
        end

verbose destination
      end
    end
  rescue Zlib::DataError
    raise Gem::Exception, errstr
  end

##
  # Reads the file list section from the old-format gem +io+

def file_list(io) # :nodoc:
    header = String.new

read_until_dashes io do |line|
      header << line
    end

Gem::SafeYAML.safe_load header
  end

##
  # Reads lines until a "---" separator is found

def read_until_dashes(io) # :nodoc:
    while (line = io.gets) && line.chomp.strip != "---" do
      yield line if block_given?
    end
  end

##
  # Skips the Ruby self-install header in +io+.

def skip_ruby(io) # :nodoc:
    loop do
      line = io.gets

return if line.chomp == '__END__'
      break unless line
    end

raise Gem::Exception, "Failed to find end of Ruby script while reading gem"
  end

##
  # The specification for this gem

def spec
    verify

return @spec if @spec

yaml = String.new

@gem.with_read_io do |io|
      skip_ruby io
      read_until_dashes io do |line|
        yaml << line
      end
    end

begin
      @spec = Gem::Specification.from_yaml yaml
    rescue YAML::SyntaxError
      raise Gem::Exception, "Failed to parse gem specification out of gem file"
    end
  rescue ArgumentError
    raise Gem::Exception, "Failed to parse gem specification out of gem file"
  end

##
  # Raises an exception if a security policy that verifies data is active.
  # Old format gems cannot be verified as signed.

def verify
    return true unless @security_policy

raise Gem::Security::Exception,
          'old format gems do not contain signatures and cannot be verified' if
      @security_policy.verify_data

true
  end
end

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