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Class: Gem::Package::TarReader::Entry

Relationships & Source Files
Inherits: Object
Defined in: lib/rubygems/package/tar_reader/entry.rb

Overview

Class for reading entries out of a tar file

Class Method Summary

Instance Attribute Summary

Instance Method Summary

  • #bytes_read

    Number of bytes read out of the tar entry.

  • #close

    Closes the tar entry.

  • #full_name

    Full name of the tar entry.

  • #getc

    Read one byte from the tar entry.

  • #pos

    The position in the tar entry.

  • #read(len = nil) (also: #readpartial)

    Reads len bytes from the tar file entry, or the rest of the entry if nil.

  • #rewind

    Rewinds to the beginning of the tar file entry.

Constructor Details

.new(header, io) ⇒ Entry

Creates a new tar entry for #header that will be read from io

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 21

def initialize(header, io)
  @closed = false
  @header = header
  @io = io
  @orig_pos = @io.pos
  @read = 0
end

Instance Attribute Details

#closed?Boolean (readonly)

Is the tar entry closed?

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 50

def closed?
  @closed
end

#directory?Boolean (readonly)

Is this tar entry a directory?

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 95

def directory?
  @header.typeflag == "5"
end

#eof?Boolean (readonly)

Are we at the end of the tar entry?

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 57

def eof?
  check_closed

  @read >= @header.size
end

#file?Boolean (readonly)

Is this tar entry a file?

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 102

def file?
  @header.typeflag == "0"
end

#header (readonly)

Header for this tar entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 16

attr_reader :header

#symlink?Boolean (readonly)

Is this tar entry a symlink?

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 109

def symlink?
  @header.typeflag == "2"
end

Instance Method Details

#bytes_read

Number of bytes read out of the tar entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 36

def bytes_read
  @read
end

#close

Closes the tar entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 43

def close
  @closed = true
end

#full_name

Full name of the tar entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 66

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

#getc

Read one byte from the tar entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 81

def getc
  check_closed

  return nil if @read >= @header.size

  ret = @io.getc
  @read += 1 if ret

  ret
end

#pos

The position in the tar entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 116

def pos
  check_closed

  bytes_read
end

#read(len = nil) Also known as: #readpartial

Reads len bytes from the tar file entry, or the rest of the entry if nil

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 126

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

#rewind

Rewinds to the beginning of the tar file entry

[ GitHub ]

  
# File 'lib/rubygems/package/tar_reader/entry.rb', line 145

def rewind
  check_closed

  raise Gem::Package::NonSeekableIO unless @io.respond_to? :pos=

  @io.pos = @orig_pos
  @read = 0
end