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authorJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-16 18:49:26 +0900
committerJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-30 00:39:06 +0900
commitfcbf63e62c627deae76c1b8cb8c0876c536ed811 (patch)
tree64cb17de3f41a2b6fef2368028fbd00349946994 /jni/ruby/lib/rubygems/package/tar_reader/entry.rb
Fresh start
Diffstat (limited to 'jni/ruby/lib/rubygems/package/tar_reader/entry.rb')
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1 files changed, 147 insertions, 0 deletions
diff --git a/jni/ruby/lib/rubygems/package/tar_reader/entry.rb b/jni/ruby/lib/rubygems/package/tar_reader/entry.rb
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+# -*- coding: utf-8 -*-
+#++
+# Copyright (C) 2004 Mauricio Julio Fernández Pradier
+# See LICENSE.txt for additional licensing information.
+#--
+
+##
+# Class for reading entries out of a tar file
+
+class Gem::Package::TarReader::Entry
+
+ ##
+ # Header for this tar entry
+
+ attr_reader :header
+
+ ##
+ # Creates a new tar entry for +header+ that will be read from +io+
+
+ def initialize(header, io)
+ @closed = false
+ @header = header
+ @io = io
+ @orig_pos = @io.pos
+ @read = 0
+ end
+
+ def check_closed # :nodoc:
+ raise IOError, "closed #{self.class}" if closed?
+ end
+
+ ##
+ # Number of bytes read out of the tar entry
+
+ def bytes_read
+ @read
+ end
+
+ ##
+ # Closes the tar entry
+
+ def close
+ @closed = true
+ end
+
+ ##
+ # Is the tar entry closed?
+
+ def closed?
+ @closed
+ end
+
+ ##
+ # Are we at the end of the tar entry?
+
+ def eof?
+ check_closed
+
+ @read >= @header.size
+ end
+
+ ##
+ # Full name of the tar entry
+
+ def full_name
+ if @header.prefix != "" then
+ File.join @header.prefix, @header.name
+ else
+ @header.name
+ end
+ rescue ArgumentError => e
+ raise unless e.message == 'string contains null byte'
+ raise Gem::Package::TarInvalidError,
+ 'tar is corrupt, name contains null byte'
+ end
+
+ ##
+ # Read one byte from the tar entry
+
+ def getc
+ check_closed
+
+ return nil if @read >= @header.size
+
+ ret = @io.getc
+ @read += 1 if ret
+
+ ret
+ end
+
+ ##
+ # Is this tar entry a directory?
+
+ def directory?
+ @header.typeflag == "5"
+ end
+
+ ##
+ # Is this tar entry a file?
+
+ def file?
+ @header.typeflag == "0"
+ end
+
+ ##
+ # The position in the tar entry
+
+ def pos
+ check_closed
+
+ bytes_read
+ end
+
+ ##
+ # Reads +len+ bytes from the tar file entry, or the rest of the entry if
+ # nil
+
+ def read(len = nil)
+ check_closed
+
+ return nil if @read >= @header.size
+
+ len ||= @header.size - @read
+ max_read = [len, @header.size - @read].min
+
+ ret = @io.read max_read
+ @read += ret.size
+
+ ret
+ end
+
+ alias readpartial read # :nodoc:
+
+ ##
+ # Rewinds to the beginning of the tar file entry
+
+ def rewind
+ check_closed
+
+ raise Gem::Package::NonSeekableIO unless @io.respond_to? :pos=
+
+ @io.pos = @orig_pos
+ @read = 0
+ end
+
+end
+