Class: Gem::Package::TarReader
- Includes:
- Enumerable
- Defined in:
- lib/rubygems/package/tar_reader.rb
Overview
TarReader reads tar files and allows iteration over their items
Defined Under Namespace
Classes: Entry, UnexpectedEOF
Class Method Summary collapse
-
.new(io) ⇒ Object
Creates a new TarReader on
io
and yields it to the block, if given.
Instance Method Summary collapse
-
#close ⇒ Object
Close the tar file.
-
#each ⇒ Object
(also: #each_entry)
Iterates over files in the tarball yielding each entry.
-
#initialize(io) ⇒ TarReader
constructor
Creates a new tar file reader on
io
which needs to respond to #pos, #eof?, #read, #getc and #pos=. -
#rewind ⇒ Object
NOTE: Do not call #rewind during #each.
-
#seek(name) ⇒ Object
Seeks through the tar file until it finds the
entry
withname
and yields it.
Constructor Details
#initialize(io) ⇒ TarReader
Creates a new tar file reader on io
which needs to respond to #pos, #eof?, #read, #getc and #pos=
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# File 'lib/rubygems/package/tar_reader.rb', line 39 def initialize(io) @io = io @init_pos = io.pos end |
Class Method Details
.new(io) ⇒ Object
Creates a new TarReader on io
and yields it to the block, if given.
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# File 'lib/rubygems/package/tar_reader.rb', line 21 def self.new(io) reader = super return reader unless block_given? begin yield reader ensure reader.close end nil end |
Instance Method Details
#close ⇒ Object
Close the tar file
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# File 'lib/rubygems/package/tar_reader.rb', line 47 def close end |
#each ⇒ Object Also known as: each_entry
Iterates over files in the tarball yielding each entry
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# File 'lib/rubygems/package/tar_reader.rb', line 53 def each return enum_for __method__ unless block_given? use_seek = @io.respond_to?(:seek) until @io.eof? do header = Gem::Package::TarHeader.from @io return if header.empty? entry = Gem::Package::TarReader::Entry.new header, @io size = entry.header.size yield entry skip = (512 - (size % 512)) % 512 pending = size - entry.bytes_read if use_seek begin # avoid reading if the @io supports seeking @io.seek pending, IO::SEEK_CUR pending = 0 rescue Errno::EINVAL end end # if seeking isn't supported or failed while pending > 0 do bytes_read = @io.read([pending, 4096].min).size raise UnexpectedEOF if @io.eof? pending -= bytes_read end @io.read skip # discard trailing zeros # make sure nobody can use #read, #getc or #rewind anymore entry.close end end |
#rewind ⇒ Object
NOTE: Do not call #rewind during #each
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# File 'lib/rubygems/package/tar_reader.rb', line 98 def rewind if @init_pos == 0 @io.rewind else @io.pos = @init_pos end end |
#seek(name) ⇒ Object
Seeks through the tar file until it finds the entry
with name
and yields it. Rewinds the tar file to the beginning when the block terminates.
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# File 'lib/rubygems/package/tar_reader.rb', line 111 def seek(name) # :yields: entry found = find do |entry| entry.full_name == name end return unless found return yield found ensure rewind end |