83 lines
2.0 KiB
Ruby
83 lines
2.0 KiB
Ruby
#--
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# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
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# All rights reserved.
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# See LICENSE.txt for permissions.
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#++
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require 'rubygems/package'
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##
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# Gem::Format knows the guts of the RubyGem .gem file format and provides the
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# capability to read gem files
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class Gem::Format
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attr_accessor :spec
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attr_accessor :file_entries
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attr_accessor :gem_path
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##
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# Constructs a Format representing the gem's data which came from +gem_path+
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def initialize(gem_path)
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@gem_path = gem_path
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end
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##
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# Reads the gem +file_path+ using +security_policy+ and returns a Format
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# representing the data in the gem
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def self.from_file_by_path(file_path, security_policy = nil)
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unless File.file?(file_path)
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raise Gem::Exception, "Cannot load gem at [#{file_path}] in #{Dir.pwd}"
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end
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start = File.read file_path, 20
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if start.nil? or start.length < 20 then
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nil
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elsif start.include?("MD5SUM =") # old version gems
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require 'rubygems/old_format'
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Gem::OldFormat.from_file_by_path file_path
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else
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begin
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open file_path, Gem.binary_mode do |io|
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from_io io, file_path, security_policy
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end
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rescue Gem::Package::TarInvalidError => e
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message = "corrupt gem (#{e.class}: #{e.message})"
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raise Gem::Package::FormatError.new(message, file_path)
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end
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end
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end
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##
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# Reads a gem from +io+ at +gem_path+ using +security_policy+ and returns a
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# Format representing the data from the gem
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def self.from_io(io, gem_path="(io)", security_policy = nil)
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format = new gem_path
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Gem::Package.open io, 'r', security_policy do |pkg|
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format.spec = pkg.metadata
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format.file_entries = []
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pkg.each do |entry|
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size = entry.header.size
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mode = entry.header.mode
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format.file_entries << [{
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"size" => size, "mode" => mode, "path" => entry.full_name,
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},
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entry.read
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]
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end
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end
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format
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end
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end
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