# File lib/rubygems/package/tar_test_case.rb, line 74 def header(type, fname, dname, length, mode, checksum = nil) checksum ||= " " * 8 arr = [ # struct tarfile_entry_posix ASCIIZ(fname, 100), # char name[100]; ASCII + (Z unless filled) Z(to_oct(mode, 7)), # char mode[8]; 0 padded, octal null Z(to_oct(0, 7)), # char uid[8]; ditto Z(to_oct(0, 7)), # char gid[8]; ditto Z(to_oct(length, 11)), # char size[12]; 0 padded, octal, null Z(to_oct(0, 11)), # char mtime[12]; 0 padded, octal, null checksum, # char checksum[8]; 0 padded, octal, null, space type, # char typeflag[1]; file: "0" dir: "5" "\0" * 100, # char linkname[100]; ASCII + (Z unless filled) "ustar\0", # char magic[6]; "ustar\0" "00", # char version[2]; "00" ASCIIZ("wheel", 32), # char uname[32]; ASCIIZ ASCIIZ("wheel", 32), # char gname[32]; ASCIIZ Z(to_oct(0, 7)), # char devmajor[8]; 0 padded, octal, null Z(to_oct(0, 7)), # char devminor[8]; 0 padded, octal, null ASCIIZ(dname, 155) # char prefix[155]; ASCII + (Z unless filled) ] format = "C100C8C8C8C12C12C8CC100C6C2C32C32C8C8C155" h = if RUBY_VERSION >= "1.9" then arr.join else arr = arr.join("").split(//).map{|x| x[0]} arr.pack format end ret = h + "\0" * (512 - h.size) assert_equal(512, ret.size) ret end