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[Emacs-diffs] Changes to emacs/lisp/gnus/hex-util.el [lexbind]
From: |
Miles Bader |
Subject: |
[Emacs-diffs] Changes to emacs/lisp/gnus/hex-util.el [lexbind] |
Date: |
Wed, 15 Sep 2004 20:39:15 -0400 |
Index: emacs/lisp/gnus/hex-util.el
diff -c /dev/null emacs/lisp/gnus/hex-util.el:1.2.4.1
*** /dev/null Thu Sep 16 00:13:06 2004
--- emacs/lisp/gnus/hex-util.el Thu Sep 16 00:12:15 2004
***************
*** 0 ****
--- 1,74 ----
+ ;;; hex-util.el --- Functions to encode/decode hexadecimal string.
+
+ ;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+
+ ;; Author: Shuhei KOBAYASHI <address@hidden>
+ ;; 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., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, 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)
+
+ ;;; arch-tag: fe8aaa79-6c86-400e-813f-5a8cc4cb3859
+ ;;; hex-util.el ends here
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