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blob 69587cc2bad864f222e83a46c7661846e153df2b 2496 bytes (raw)
name: lisp/hex-util.el 	 # note: path name is non-authoritative(*)

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;;; hex-util.el --- Functions to encode/decode hexadecimal string. -*- lexical-binding: t -*-

;; Copyright (C) 1999, 2001-2016 Free Software Foundation, Inc.

;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
;; Keywords: data

;; This file is part of GNU Emacs.

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; 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

debug log:

solving 69587cc ...
found 69587cc in https://yhetil.org/emacs/20160813181832.GA15753@holos.localdomain/
found 4867359 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 4867359401b24951c95e7a8f8d03fe4a57e29660	lisp/hex-util.el

applying [1/1] https://yhetil.org/emacs/20160813181832.GA15753@holos.localdomain/
diff --git a/lisp/hex-util.el b/lisp/hex-util.el
index 4867359..69587cc 100644

Checking patch lisp/hex-util.el...
Applied patch lisp/hex-util.el cleanly.

index at:
100644 69587cc2bad864f222e83a46c7661846e153df2b	lisp/hex-util.el

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