/usr/share/emacs/site-lisp/flim/hex-util.el is in flim 1:1.14.9+0.20110516-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | ;;; hex-util.el --- Functions to encode/decode hexadecimal string.
;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
;; Keywords: data
;; This file is part of FLIM (Faithful Library about Internet Message).
;; 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, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
(eval-when-compile
(defmacro hex-char-to-num (chr)
`(let ((chr ,chr))
(cond
((and (<= ?a chr)(<= chr ?f)) (+ (- chr ?a) 10))
((and (<= ?A chr)(<= chr ?F)) (+ (- chr ?A) 10))
((and (<= ?0 chr)(<= chr ?9)) (- chr ?0))
(t (error "Invalid hexadecimal digit `%c'" chr)))))
(defmacro num-to-hex-char (num)
`(aref "0123456789abcdef" ,num)))
(defun decode-hex-string (string)
"Decode hexadecimal STRING to octet string."
(let* ((len (length string))
(dst (make-string (/ len 2) 0))
(idx 0)(pos 0))
(while (< pos len)
;;; logior and lsh are not byte-coded.
;;; (aset dst idx (logior (lsh (hex-char-to-num (aref string pos)) 4)
;;; (hex-char-to-num (aref string (1+ pos)))))
(aset dst idx (+ (* (hex-char-to-num (aref string pos)) 16)
(hex-char-to-num (aref string (1+ pos)))))
(setq idx (1+ idx)
pos (+ 2 pos)))
dst))
(defun encode-hex-string (string)
"Encode octet STRING to hexadecimal string."
(let* ((len (length string))
(dst (make-string (* len 2) 0))
(idx 0)(pos 0))
(while (< pos len)
;;; logand and lsh are not byte-coded.
;;; (aset dst idx (num-to-hex-char (logand (lsh (aref string pos) -4) 15)))
(aset dst idx (num-to-hex-char (/ (aref string pos) 16)))
(setq idx (1+ idx))
;;; (aset dst idx (num-to-hex-char (logand (aref string pos) 15)))
(aset dst idx (num-to-hex-char (% (aref string pos) 16)))
(setq idx (1+ idx)
pos (1+ pos)))
dst))
(provide 'hex-util)
;;; hex-util.el ends here
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