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

Inherits:
Object
  • Object
show all
Defined in:
lib/rubygems/package/tar_reader/entry.rb

Overview

Class for reading entries out of a tar file

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(header, io) ⇒ Entry

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



19
20
21
22
23
24
25
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 19

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

Instance Attribute Details

#header ⇒ Object (readonly)

Header for this tar entry



14
15
16
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 14

def header
  @header
end

Instance Method Details

#bytes_read ⇒ Object

Number of bytes read out of the tar entry



34
35
36
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 34

def bytes_read
  @read
end

#check_closed ⇒ Object

:nodoc:

Raises:

  • (IOError) 


27
28
29
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 27

def check_closed # :nodoc:
  raise IOError, "closed #{self.class}" if closed?
end

#close ⇒ Object

Closes the tar entry



41
42
43
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 41

def close
  @closed = true
end

#closed? ⇒ Boolean

Is the tar entry closed?

Returns:

  • (Boolean) 


48
49
50
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 48

def closed?
  @closed
end

#directory? ⇒ Boolean

Is this tar entry a directory?

Returns:

  • (Boolean) 


93
94
95
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 93

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

#eof? ⇒ Boolean

Are we at the end of the tar entry?

Returns:

  • (Boolean) 


55
56
57
58
59
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 55

def eof?
  check_closed

  @read >= @header.size
end

#file? ⇒ Boolean

Is this tar entry a file?

Returns:

  • (Boolean) 


100
101
102
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 100

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

#full_name ⇒ Object

Full name of the tar entry



64
65
66
67
68
69
70
71
72
73
74
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 64

def full_name
  if @header.prefix != ""
    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 ⇒ Object

Read one byte from the tar entry



79
80
81
82
83
84
85
86
87
88
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 79

def getc
  check_closed

  return nil if @read >= @header.size

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

  ret
end

#pos ⇒ Object

The position in the tar entry



114
115
116
117
118
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 114

def pos
  check_closed

  bytes_read
end

#read(len = nil) ⇒ Object

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



130
131
132
133
134
135
136
137
138
139
140
141
142
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 130

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

#readpartial(maxlen = nil, outbuf = "".b) ⇒ Object

Raises:

  • (EOFError) 


144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 144

def readpartial(maxlen = nil, outbuf = "".b)
  check_closed

  raise EOFError if @read >= @header.size

  maxlen ||= @header.size - @read
  max_read = [maxlen, @header.size - @read].min

  @io.readpartial(max_read, outbuf)
  @read += outbuf.size

  outbuf
end

#rewind ⇒ Object

Rewinds to the beginning of the tar file entry



161
162
163
164
165
166
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 161

def rewind
  check_closed

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

#size ⇒ Object Also known as: length 



120
121
122
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 120

def size
  @header.size
end

#symlink? ⇒ Boolean

Is this tar entry a symlink?

Returns:

  • (Boolean) 


107
108
109
 
# File 'lib/rubygems/package/tar_reader/entry.rb', line 107

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