Class | Gem::Package::TarReader |
In: |
lib/rubygems/package/tar_reader.rb
|
Parent: | Object |
TarReader reads tar files and allows iteration over their items
Iterates over files in the tarball yielding each entry
# File lib/rubygems/package/tar_reader.rb, line 53 53: def each 54: loop do 55: return if @io.eof? 56: 57: header = Gem::Package::TarHeader.from @io 58: return if header.empty? 59: 60: entry = Gem::Package::TarReader::Entry.new header, @io 61: size = entry.header.size 62: 63: yield entry 64: 65: skip = (512 - (size % 512)) % 512 66: pending = size - entry.bytes_read 67: 68: begin 69: # avoid reading... 70: @io.seek pending, IO::SEEK_CUR 71: pending = 0 72: rescue Errno::EINVAL, NameError 73: while pending > 0 do 74: bytes_read = @io.read([pending, 4096].min).size 75: raise UnexpectedEOF if @io.eof? 76: pending -= bytes_read 77: end 78: end 79: 80: @io.read skip # discard trailing zeros 81: 82: # make sure nobody can use #read, #getc or #rewind anymore 83: entry.close 84: end 85: end
NOTE: Do not call rewind during each
# File lib/rubygems/package/tar_reader.rb, line 92 92: def rewind 93: if @init_pos == 0 then 94: raise Gem::Package::NonSeekableIO unless @io.respond_to? :rewind 95: @io.rewind 96: else 97: raise Gem::Package::NonSeekableIO unless @io.respond_to? :pos= 98: @io.pos = @init_pos 99: end 100: end