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#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
require 'fileutils'
require 'rubygems/package'
module Gem
##
# The format class knows the guts of the RubyGem .gem file format
# and provides the capability to read gem files
#
class Format
attr_accessor :spec, :file_entries, :gem_path
extend Gem::UserInteraction
##
# Constructs an instance of a Format object, representing the gem's
# data structure.
#
# gem:: [String] The file name of the gem
#
def initialize(gem_path)
@gem_path = gem_path
end
##
# Reads the named gem file and returns a Format object, representing
# the data from the gem file
#
# file_path:: [String] Path to the gem file
#
def self.from_file_by_path(file_path, security_policy = nil)
format = nil
unless File.exist?(file_path)
raise Gem::Exception, "Cannot load gem at [#{file_path}] in #{Dir.pwd}"
end
# check for old version gem
if File.read(file_path, 20).include?("MD5SUM =")
require 'rubygems/old_format'
format = OldFormat.from_file_by_path(file_path)
else
open file_path, Gem.binary_mode do |io|
format = from_io io, file_path, security_policy
end
end
return format
end
##
# Reads a gem from an io stream and returns a Format object, representing
# the data from the gem file
#
# io:: [IO] Stream from which to read the gem
#
def self.from_io(io, gem_path="(io)", security_policy = nil)
format = new gem_path
Package.open io, 'r', security_policy do |pkg|
format.spec = pkg.metadata
format.file_entries = []
pkg.each do |entry|
size = entry.header.size
mode = entry.header.mode
format.file_entries << [{
"size" => size, "mode" => mode, "path" => entry.full_name,
},
entry.read
]
end
end
format
end
end
end
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