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Edit File : tar_header.rb \| Size : 5.85 KB
# frozen_string_literal: true #-- # Copyright (C) 2004 Mauricio Julio Fernández Pradier # See LICENSE.txt for additional licensing information. #++ ## #-- # struct tarfile_entry_posix { # char name[100]; # ASCII + (Z unless filled) # char mode[8]; # 0 padded, octal, null # char uid[8]; # ditto # char gid[8]; # ditto # char size[12]; # 0 padded, octal, null # char mtime[12]; # 0 padded, octal, null # char checksum[8]; # 0 padded, octal, null, space # char typeflag[1]; # file: "0" dir: "5" # char linkname[100]; # ASCII + (Z unless filled) # char magic[6]; # "ustar\0" # char version[2]; # "00" # char uname[32]; # ASCIIZ # char gname[32]; # ASCIIZ # char devmajor[8]; # 0 padded, octal, null # char devminor[8]; # o padded, octal, null # char prefix[155]; # ASCII + (Z unless filled) # }; #++ # A header for a tar file class Gem::Package::TarHeader ## # Fields in the tar header FIELDS = [ :checksum, :devmajor, :devminor, :gid, :gname, :linkname, :magic, :mode, :mtime, :name, :prefix, :size, :typeflag, :uid, :uname, :version, ].freeze ## # Pack format for a tar header PACK_FORMAT = "a100" + # name "a8" + # mode "a8" + # uid "a8" + # gid "a12" + # size "a12" + # mtime "a7a" + # chksum "a" + # typeflag "a100" + # linkname "a6" + # magic "a2" + # version "a32" + # uname "a32" + # gname "a8" + # devmajor "a8" + # devminor "a155" # prefix ## # Unpack format for a tar header UNPACK_FORMAT = "A100" + # name "A8" + # mode "A8" + # uid "A8" + # gid "A12" + # size "A12" + # mtime "A8" + # checksum "A" + # typeflag "A100" + # linkname "A6" + # magic "A2" + # version "A32" + # uname "A32" + # gname "A8" + # devmajor "A8" + # devminor "A155" # prefix attr_reader(FIELDS) EMPTY_HEADER = ("\0" 512).freeze # :nodoc: ## # Creates a tar header from IO +stream+ def self.from(stream) header = stream.read 512 empty = (EMPTY_HEADER == header) fields = header.unpack UNPACK_FORMAT new :name => fields.shift, :mode => strict_oct(fields.shift), :uid => oct_or_256based(fields.shift), :gid => oct_or_256based(fields.shift), :size => strict_oct(fields.shift), :mtime => strict_oct(fields.shift), :checksum => strict_oct(fields.shift), :typeflag => fields.shift, :linkname => fields.shift, :magic => fields.shift, :version => strict_oct(fields.shift), :uname => fields.shift, :gname => fields.shift, :devmajor => strict_oct(fields.shift), :devminor => strict_oct(fields.shift), :prefix => fields.shift, :empty => empty end def self.strict_oct(str) return str.strip.oct if str.strip =~ /\A[0-7]\z/ raise ArgumentError, "#{str.inspect} is not an octal string" end def self.oct_or_256based(str) # \x80 flags a positive 256-based number # \ff flags a negative 256-based number # In case we have a match, parse it as a signed binary value # in big-endian order, except that the high-order bit is ignored. return str.unpack("N2").last if str =~ /\A[\x80\xff]/n strict_oct(str) end ## # Creates a new TarHeader using +vals+ def initialize(vals) unless vals[:name] && vals[:size] && vals[:prefix] && vals[:mode] raise ArgumentError, ":name, :size, :prefix and :mode required" end vals[:uid] \|\|= 0 vals[:gid] \|\|= 0 vals[:mtime] \|\|= 0 vals[:checksum] \|\|= "" vals[:typeflag] = "0" if vals[:typeflag].nil? \|\| vals[:typeflag].empty? vals[:magic] \|\|= "ustar" vals[:version] \|\|= "00" vals[:uname] \|\|= "wheel" vals[:gname] \|\|= "wheel" vals[:devmajor] \|\|= 0 vals[:devminor] \|\|= 0 FIELDS.each do \|name\| instance_variable_set "@#{name}", vals[name] end @empty = vals[:empty] end ## # Is the tar entry empty? def empty? @empty end def ==(other) # :nodoc: self.class === other && @checksum == other.checksum && @devmajor == other.devmajor && @devminor == other.devminor && @gid == other.gid && @gname == other.gname && @linkname == other.linkname && @magic == other.magic && @mode == other.mode && @mtime == other.mtime && @name == other.name && @prefix == other.prefix && @size == other.size && @typeflag == other.typeflag && @uid == other.uid && @uname == other.uname && @version == other.version end def to_s # :nodoc: update_checksum header end ## # Updates the TarHeader's checksum def update_checksum header = header " " 8 @checksum = oct calculate_checksum(header), 6 end private def calculate_checksum(header) header.sum(0) end def header(checksum = @checksum) header = [ name, oct(mode, 7), oct(uid, 7), oct(gid, 7), oct(size, 11), oct(mtime, 11), checksum, " ", typeflag, linkname, magic, oct(version, 2), uname, gname, oct(devmajor, 7), oct(devminor, 7), prefix, ] header = header.pack PACK_FORMAT header << ("\0" * ((512 - header.size) % 512)) end def oct(num, len) "%0#{len}o" % num end end Back

Edit File : tar_header.rb | Size : 5.85 KB

# frozen_string_literal: true

#--
# Copyright (C) 2004 Mauricio Julio Fernández Pradier
# See LICENSE.txt for additional licensing information.
#++

##
#--
# struct tarfile_entry_posix {
#   char name[100];     # ASCII + (Z unless filled)
#   char mode[8];       # 0 padded, octal, null
#   char uid[8];        # ditto
#   char gid[8];        # ditto
#   char size[12];      # 0 padded, octal, null
#   char mtime[12];     # 0 padded, octal, null
#   char checksum[8];   # 0 padded, octal, null, space
#   char typeflag[1];   # file: "0"  dir: "5"
#   char linkname[100]; # ASCII + (Z unless filled)
#   char magic[6];      # "ustar\0"
#   char version[2];    # "00"
#   char uname[32];     # ASCIIZ
#   char gname[32];     # ASCIIZ
#   char devmajor[8];   # 0 padded, octal, null
#   char devminor[8];   # o padded, octal, null
#   char prefix[155];   # ASCII + (Z unless filled)
# };
#++
# A header for a tar file

class Gem::Package::TarHeader
  ##
  # Fields in the tar header

FIELDS = [
    :checksum,
    :devmajor,
    :devminor,
    :gid,
    :gname,
    :linkname,
    :magic,
    :mode,
    :mtime,
    :name,
    :prefix,
    :size,
    :typeflag,
    :uid,
    :uname,
    :version,
  ].freeze

##
  # Pack format for a tar header

PACK_FORMAT = "a100" + # name
                "a8"   + # mode
                "a8"   + # uid
                "a8"   + # gid
                "a12"  + # size
                "a12"  + # mtime
                "a7a"  + # chksum
                "a"    + # typeflag
                "a100" + # linkname
                "a6"   + # magic
                "a2"   + # version
                "a32"  + # uname
                "a32"  + # gname
                "a8"   + # devmajor
                "a8"   + # devminor
                "a155"   # prefix

##
  # Unpack format for a tar header

UNPACK_FORMAT = "A100" + # name
                  "A8"   + # mode
                  "A8"   + # uid
                  "A8"   + # gid
                  "A12"  + # size
                  "A12"  + # mtime
                  "A8"   + # checksum
                  "A"    + # typeflag
                  "A100" + # linkname
                  "A6"   + # magic
                  "A2"   + # version
                  "A32"  + # uname
                  "A32"  + # gname
                  "A8"   + # devmajor
                  "A8"   + # devminor
                  "A155"   # prefix

attr_reader(*FIELDS)

EMPTY_HEADER = ("\0" * 512).freeze # :nodoc:

##
  # Creates a tar header from IO +stream+

def self.from(stream)
    header = stream.read 512
    empty = (EMPTY_HEADER == header)

fields = header.unpack UNPACK_FORMAT

new :name => fields.shift,
        :mode => strict_oct(fields.shift),
        :uid => oct_or_256based(fields.shift),
        :gid => oct_or_256based(fields.shift),
        :size => strict_oct(fields.shift),
        :mtime => strict_oct(fields.shift),
        :checksum => strict_oct(fields.shift),
        :typeflag => fields.shift,
        :linkname => fields.shift,
        :magic => fields.shift,
        :version => strict_oct(fields.shift),
        :uname => fields.shift,
        :gname => fields.shift,
        :devmajor => strict_oct(fields.shift),
        :devminor => strict_oct(fields.shift),
        :prefix => fields.shift,

:empty => empty
  end

def self.strict_oct(str)
    return str.strip.oct if str.strip =~ /\A[0-7]*\z/

raise ArgumentError, "#{str.inspect} is not an octal string"
  end

def self.oct_or_256based(str)
    # \x80 flags a positive 256-based number
    # \ff flags a negative 256-based number
    # In case we have a match, parse it as a signed binary value
    # in big-endian order, except that the high-order bit is ignored.
    return str.unpack("N2").last if str =~ /\A[\x80\xff]/n
    strict_oct(str)
  end

##
  # Creates a new TarHeader using +vals+

def initialize(vals)
    unless vals[:name] && vals[:size] && vals[:prefix] && vals[:mode]
      raise ArgumentError, ":name, :size, :prefix and :mode required"
    end

vals[:uid] ||= 0
    vals[:gid] ||= 0
    vals[:mtime] ||= 0
    vals[:checksum] ||= ""
    vals[:typeflag] = "0" if vals[:typeflag].nil? || vals[:typeflag].empty?
    vals[:magic] ||= "ustar"
    vals[:version] ||= "00"
    vals[:uname] ||= "wheel"
    vals[:gname] ||= "wheel"
    vals[:devmajor] ||= 0
    vals[:devminor] ||= 0

FIELDS.each do |name|
      instance_variable_set "@#{name}", vals[name]
    end

@empty = vals[:empty]
  end

##
  # Is the tar entry empty?

def empty?
    @empty
  end

def ==(other) # :nodoc:
    self.class === other &&
      @checksum == other.checksum &&
      @devmajor == other.devmajor &&
      @devminor == other.devminor &&
      @gid      == other.gid      &&
      @gname    == other.gname    &&
      @linkname == other.linkname &&
      @magic    == other.magic    &&
      @mode     == other.mode     &&
      @mtime    == other.mtime    &&
      @name     == other.name     &&
      @prefix   == other.prefix   &&
      @size     == other.size     &&
      @typeflag == other.typeflag &&
      @uid      == other.uid      &&
      @uname    == other.uname    &&
      @version  == other.version
  end

def to_s # :nodoc:
    update_checksum
    header
  end

##
  # Updates the TarHeader's checksum

def update_checksum
    header = header " " * 8
    @checksum = oct calculate_checksum(header), 6
  end

private

def calculate_checksum(header)
    header.sum(0)
  end

def header(checksum = @checksum)
    header = [
      name,
      oct(mode, 7),
      oct(uid, 7),
      oct(gid, 7),
      oct(size, 11),
      oct(mtime, 11),
      checksum,
      " ",
      typeflag,
      linkname,
      magic,
      oct(version, 2),
      uname,
      gname,
      oct(devmajor, 7),
      oct(devminor, 7),
      prefix,
    ]

header = header.pack PACK_FORMAT

header << ("\0" * ((512 - header.size) % 512))
  end

def oct(num, len)
    "%0#{len}o" % num
  end
end

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