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#
# ar.rb - ar(1) ruby interface (for debian.rb)
# Copyright (c) 2001 Fumitoshi UKAI <ukai@debian.or.jp>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# $Id: ar.rb,v 1.3 2003/10/07 17:07:02 ukai Exp $
#
# struct ar_hdr
# {
# char ar_name[16]; /* Member file name, sometimes / terminated. */
# char ar_date[12]; /* File date, decimal seconds since Epoch. */
# char ar_uid[6], ar_gid[6]; /* User and group IDs, in ASCII decimal. */
# char ar_mode[8]; /* File mode, in ASCII octal. */
# char ar_size[10]; /* File size, in ASCII decimal. */
# char ar_fmag[2]; /* Always contains ARFMAG. */
# };
module Debian
class ArError < StandardError; end
class Ar
ARMAG = "!<arch>\n"
SARMAG = 8
ARFMAG = "`\n"
AR_HDR_SIZE = (16+12+6+6+8+10+2)
class ArFile
class Stat
def initialize(time,uid,gid,mode,size,dev)
@time, @uid, @gid, @mode, @size, @dev = time,uid,gid,mode,size,dev
end
def <=>(s) @time <=> s.atime; end
def atime; @time; end
def blksize; 0; end
def blockdev?; false; end
def blocks; 0; end
def chardev?; false; end
def ctime; @time; end
def dev; @dev; end
def directory?; false; end
def executable?; false; end
def executable_real?; false; end
def file?; true; end
def ftype; 'file'; end
def gid; @gid; end
def grpowned?; false; end
def ino; @dev; end
def mode; @mode; end
def mtime; @time; end
def nlink; 1; end
def owned?; false; end
def pipe?; false; end
def rdev; @dev; end
def readable?; true; end
def readable_real?; true; end
def setgid?; false; end
def setuid?; false; end
def size; @size; end
def size?; @size == 0 ? nil : @size; end
def socket?; false; end
def sticky?; false; end
def symlink?; false; end
def uid; @uid; end
def writable?; false; end
def writable_real?; false; end
def zero?; @size == 0; end
end
def initialize(fp,name,date,uid,gid,mode,size,pos)
@fp,@name = fp,name
@stat = Stat.new(date,uid,gid,mode,size,pos)
@size = size
@pos = pos
@cur = 0
end
attr_reader :name, :size, :pos, :cur, :stat
def read(size = -1)
if size < 0
size = @size - @cur
end
if @cur + size > @size
size = @size - @cur
end
@fp.seek(@pos + @cur, IO::SEEK_SET)
r = @fp.read(size)
@cur += r.size
return r
end
def eof?; @cur == @size; end
def rewind; @cur = 0; end
end
def initialize(file)
@fp = File.open(file)
magic = @fp.gets
unless magic == ARMAG
raise ArError, "archive broken"
end
@ofs = []
end
def close
@fp.close
end
def list
@fp.seek(SARMAG, IO::SEEK_SET)
while ! @fp.eof?
hdr = @fp.read(AR_HDR_SIZE)
name,date,uid,gid,mode,size,fmag = hdr.unpack('a16a12a6a6a8a10a2')
unless fmag == ARFMAG
raise ArError, "invalid archive field magic #{fmag} @ #{@fp.pos} [#{hdr}]"
end
name.strip!
size = size.to_i
@ofs.push(ArFile.new(@fp,
name,Time.at(date.to_i), uid.to_i, gid.to_i,
mode.oct, size, @fp.pos))
# puts "hdr=[#{hdr}] pos=#{@fp.pos}, size=#{size} #{(size + 1)&~1}"
@fp.seek((size + 1)&~1, IO::SEEK_CUR)
end
@ofs
end
def each_file
if @ofs.empty?; list; end
@ofs.each {|file|
yield file.name, file
}
end
def open(name)
if @ofs.empty?; list; end
@ofs.each {|file|
if file.name == name
if block_given?
return yield(file)
else
return file
end
end
}
end
end
end
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