-;;; jka-compr.el - reading/writing/loading compressed files.
-;;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+;;; jka-compr.el --- reading/writing/loading compressed files
+
+;; Copyright (C) 1993, 1994, 1995, 1997, 1999, 2000, 2002, 2003,
+;; 2004, 2005, 2006 Free Software Foundation, Inc.
;; Author: jka@ece.cmu.edu (Jay K. Adams)
+;; Maintainer: FSF
;; Keywords: data
-;;; Commentary:
-
-;;; This package implements low-level support for reading, writing,
-;;; and loading compressed files. It hooks into the low-level file
-;;; I/O functions (including write-region and insert-file-contents) so
-;;; that they automatically compress or uncompress a file if the file
-;;; appears to need it (based on the extension of the file name).
-;;; Packages like Rmail, VM, GNUS, and Info should be able to work
-;;; with compressed files without modification.
-
-
-;;; INSTRUCTIONS:
-;;;
-;;; To use jka-compr, simply load this package, and edit as usual.
-;;; Its operation should be transparent to the user (except for
-;;; messages appearing when a file is being compressed or
-;;; uncompressed).
-;;;
-;;; The variable, jka-compr-compression-info-list can be used to
-;;; customize jka-compr to work with other compression programs.
-;;; The default value of this variable allows jka-compr to work with
-;;; Unix compress and gzip.
-;;;
-;;; If you are concerned about the stderr output of gzip and other
-;;; compression/decompression programs showing up in your buffers, you
-;;; should set the discard-error flag in the compression-info-list.
-;;; This will cause the stderr of all programs to be discarded.
-;;; However, it also causes emacs to call compression/uncompression
-;;; programs through a shell (which is specified by jka-compr-shell).
-;;; This may be a drag if, on your system, starting up a shell is
-;;; slow.
-;;;
-;;; If you don't want messages about compressing and decompressing
-;;; to show up in the echo area, you can set the compress-name and
-;;; decompress-name fields of the jka-compr-compression-info-list to
-;;; nil.
-
-
-;;; APPLICATION NOTES:
-;;;
-;;; crypt++
-;;; jka-compr can coexist with crpyt++ if you take all the decompression
-;;; entries out of the crypt-encoding-list. Clearly problems will arise if
-;;; you have two programs trying to compress/decompress files. jka-compr
-;;; will not "work with" crypt++ in the following sense: you won't be able to
-;;; decode encrypted compressed files--that is, files that have been
-;;; compressed then encrypted (in that order). Theoretically, crypt++ and
-;;; jka-compr could properly handle a file that has been encrypted then
-;;; compressed, but there is little point in trying to compress an encrypted
-;;; file.
-;;;
-
-
-;;; ACKNOWLEDGMENTS
-;;;
-;;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people
-;;; have made helpful suggestions, reported bugs, and even fixed bugs in
-;;; jka-compr. I recall the following people as being particularly helpful.
-;;;
-;;; Jean-loup Gailly
-;;; David Hughes
-;;; Richard Pieri
-;;; Daniel Quinlan
-;;; Chris P. Ross
-;;; Rick Sladkey
-;;;
-;;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for
-;;; Version 18 of Emacs.
-;;;
-;;; After I had made progress on the original jka-compr for V18, I learned of a
-;;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly
-;;; what I was trying to do. I looked over the jam-zcat source code and
-;;; probably got some ideas from it.
-;;;
+;; 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 2, 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; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; This package implements low-level support for reading, writing,
+;; and loading compressed files. It hooks into the low-level file
+;; I/O functions (including write-region and insert-file-contents) so
+;; that they automatically compress or uncompress a file if the file
+;; appears to need it (based on the extension of the file name).
+;; Packages like Rmail, VM, GNUS, and Info should be able to work
+;; with compressed files without modification.
+
+
+;; INSTRUCTIONS:
+;;
+;; To use jka-compr, invoke the command `auto-compression-mode' (which
+;; see), or customize the variable of the same name. Its operation
+;; should be transparent to the user (except for messages appearing when
+;; a file is being compressed or uncompressed).
+;;
+;; The variable, jka-compr-compression-info-list can be used to
+;; customize jka-compr to work with other compression programs.
+;; The default value of this variable allows jka-compr to work with
+;; Unix compress and gzip.
+;;
+;; If you are concerned about the stderr output of gzip and other
+;; compression/decompression programs showing up in your buffers, you
+;; should set the discard-error flag in the compression-info-list.
+;; This will cause the stderr of all programs to be discarded.
+;; However, it also causes emacs to call compression/uncompression
+;; programs through a shell (which is specified by jka-compr-shell).
+;; This may be a drag if, on your system, starting up a shell is
+;; slow.
+;;
+;; If you don't want messages about compressing and decompressing
+;; to show up in the echo area, you can set the compress-name and
+;; decompress-name fields of the jka-compr-compression-info-list to
+;; nil.
+
+
+;; APPLICATION NOTES:
+;;
+;; crypt++
+;; jka-compr can coexist with crypt++ if you take all the decompression
+;; entries out of the crypt-encoding-list. Clearly problems will arise if
+;; you have two programs trying to compress/decompress files. jka-compr
+;; will not "work with" crypt++ in the following sense: you won't be able to
+;; decode encrypted compressed files--that is, files that have been
+;; compressed then encrypted (in that order). Theoretically, crypt++ and
+;; jka-compr could properly handle a file that has been encrypted then
+;; compressed, but there is little point in trying to compress an encrypted
+;; file.
+;;
+
+
+;; ACKNOWLEDGMENTS
+;;
+;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people
+;; have made helpful suggestions, reported bugs, and even fixed bugs in
+;; jka-compr. I recall the following people as being particularly helpful.
+;;
+;; Jean-loup Gailly
+;; David Hughes
+;; Richard Pieri
+;; Daniel Quinlan
+;; Chris P. Ross
+;; Rick Sladkey
+;;
+;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for
+;; Version 18 of Emacs.
+;;
+;; After I had made progress on the original jka-compr for V18, I learned of a
+;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly
+;; what I was trying to do. I looked over the jam-zcat source code and
+;; probably got some ideas from it.
+;;
;;; Code:
-(defvar jka-compr-shell "sh"
+(require 'jka-cmpr-hook)
+
+(defcustom jka-compr-shell "sh"
"*Shell to be used for calling compression programs.
The value of this variable only matters if you want to discard the
stderr of a compression/decompression program (see the documentation
-for `jka-compr-compression-info-list').")
-
-
-(defvar jka-compr-use-shell t)
-
-
-;;; I have this defined so that .Z files are assumed to be in unix
-;;; compress format; and .gz files, in gzip format.
-(defvar jka-compr-compression-info-list
- ;;[regexp
- ;; compr-message compr-prog compr-args
- ;; uncomp-message uncomp-prog uncomp-args
- ;; can-append auto-mode-flag]
- '(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'"
- "compressing" "compress" ("-c")
- "uncompressing" "uncompress" ("-c")
- nil t]
- ["\\.tgz\\'"
- "zipping" "gzip" ("-c" "-q")
- "unzipping" "gzip" ("-c" "-q" "-d")
- t nil]
- ["\\.gz\\(~\\|\\.~[0-9]+~\\)?\\'"
- "zipping" "gzip" ("-c" "-q")
- "unzipping" "gzip" ("-c" "-q" "-d")
- t t])
-
- "List of vectors that describe available compression techniques.
-Each element, which describes a compression technique, is a vector of
-the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS
-UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS
-APPEND-FLAG EXTENSION], where:
-
- regexp is a regexp that matches filenames that are
- compressed with this format
-
- compress-msg is the message to issue to the user when doing this
- type of compression (nil means no message)
-
- compress-program is a program that performs this compression
-
- compress-args is a list of args to pass to the compress program
-
- uncompress-msg is the message to issue to the user when doing this
- type of uncompression (nil means no message)
-
- uncompress-program is a program that performs this compression
-
- uncompress-args is a list of args to pass to the uncompress program
-
- append-flag is non-nil if this compression technique can be
- appended
-
- auto-mode flag non-nil means strip the regexp from file names
- before attempting to set the mode.
-
-Because of the way `call-process' is defined, discarding the stderr output of
-a program adds the overhead of starting a shell each time the program is
-invoked.")
-
-(defvar jka-compr-mode-alist-additions
- (list (cons "\\.tgz\\'" 'tar-mode))
- "A list of pairs to add to auto-mode-alist when jka-compr is installed.")
-
-(defvar jka-compr-file-name-handler-entry
- nil
- "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.")
+for `jka-compr-compression-info-list')."
+ :type 'string
+ :group 'jka-compr)
+
+(defvar jka-compr-use-shell
+ (not (memq system-type '(ms-dos windows-nt))))
+
+(defvar jka-compr-really-do-compress nil
+ "Non-nil in a buffer whose visited file was uncompressed on visiting it.
+This means compress the data on writing the file, even if the
+data appears to be compressed already.")
+(make-variable-buffer-local 'jka-compr-really-do-compress)
+(put 'jka-compr-really-do-compress 'permanent-local t)
\f
-;;; Functions for accessing the return value of jka-get-compression-info
-(defun jka-compr-info-regexp (info) (aref info 0))
-(defun jka-compr-info-compress-message (info) (aref info 1))
-(defun jka-compr-info-compress-program (info) (aref info 2))
-(defun jka-compr-info-compress-args (info) (aref info 3))
-(defun jka-compr-info-uncompress-message (info) (aref info 4))
-(defun jka-compr-info-uncompress-program (info) (aref info 5))
-(defun jka-compr-info-uncompress-args (info) (aref info 6))
-(defun jka-compr-info-can-append (info) (aref info 7))
-(defun jka-compr-info-strip-extension (info) (aref info 8))
-
-
-(defun jka-compr-get-compression-info (filename)
- "Return information about the compression scheme of FILENAME.
-The determination as to which compression scheme, if any, to use is
-based on the filename itself and `jka-compr-compression-info-list'."
- (catch 'compression-info
- (let ((case-fold-search nil))
- (mapcar
- (function (lambda (x)
- (and (string-match (jka-compr-info-regexp x) filename)
- (throw 'compression-info x))))
- jka-compr-compression-info-list)
- nil)))
-
(put 'compression-error 'error-conditions '(compression-error file-error error))
(defun jka-compr-error (prog args infile message &optional errfile)
- (let ((errbuf (get-buffer-create " *jka-compr-error*"))
- (curbuf (current-buffer)))
- (set-buffer errbuf)
- (widen) (erase-buffer)
- (insert (format "Error while executing \"%s %s < %s\"\n\n"
- prog
- (mapconcat 'identity args " ")
- infile))
+ (let ((errbuf (get-buffer-create " *jka-compr-error*")))
+ (with-current-buffer errbuf
+ (widen) (erase-buffer)
+ (insert (format "Error while executing \"%s %s < %s\"\n\n"
+ prog
+ (mapconcat 'identity args " ")
+ infile))
- (and errfile
- (insert-file-contents errfile))
-
- (set-buffer curbuf)
+ (and errfile
+ (insert-file-contents errfile)))
(display-buffer errbuf))
- (signal 'compression-error (list "Opening input file" (format "error %s" message) infile)))
-
-
-(defvar jka-compr-dd-program
- "/bin/dd")
+ (signal 'compression-error
+ (list "Opening input file" (format "error %s" message) infile)))
+
+
+(defcustom jka-compr-dd-program "/bin/dd"
+ "How to invoke `dd'."
+ :type 'string
+ :group 'jka-compr)
(defvar jka-compr-dd-blocksize 256)
"Call program PROG with ARGS args taking input from INFILE.
Fourth and fifth args, BEG and LEN, specify which part of the output
to keep: LEN chars starting BEG chars from the beginning."
- (let* ((skip (/ beg jka-compr-dd-blocksize))
- (prefix (- beg (* skip jka-compr-dd-blocksize)))
- (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize))))
- (start (point))
- (err-file (jka-compr-make-temp-name))
- (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null"
- prog
- (mapconcat 'identity args " ")
- err-file
- jka-compr-dd-program
- jka-compr-dd-blocksize
- skip
- ;; dd seems to be unreliable about
- ;; providing the last block. So, always
- ;; read one more than you think you need.
- (if count (concat "count=" (1+ count)) ""))))
-
- (unwind-protect
- (or (memq (call-process jka-compr-shell
- infile t nil "-c"
- run-string)
- jka-compr-acceptable-retval-list)
-
- (jka-compr-error prog args infile message err-file))
-
- (jka-compr-delete-temp-file err-file))
+ (let ((start (point))
+ (prefix beg))
+ (if (and jka-compr-use-shell jka-compr-dd-program)
+ ;; Put the uncompression output through dd
+ ;; to discard the part we don't want.
+ (let ((skip (/ beg jka-compr-dd-blocksize))
+ (err-file (jka-compr-make-temp-name))
+ count)
+ ;; Update PREFIX based on the text that we won't read in.
+ (setq prefix (- beg (* skip jka-compr-dd-blocksize))
+ count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize))))
+ (unwind-protect
+ (or (memq (call-process
+ jka-compr-shell infile t nil "-c"
+ (format
+ "%s %s 2> %s | %s bs=%d skip=%d %s 2> %s"
+ prog
+ (mapconcat 'identity args " ")
+ err-file
+ jka-compr-dd-program
+ jka-compr-dd-blocksize
+ skip
+ ;; dd seems to be unreliable about
+ ;; providing the last block. So, always
+ ;; read one more than you think you need.
+ (if count (format "count=%d" (1+ count)) "")
+ null-device))
+ jka-compr-acceptable-retval-list)
+ (jka-compr-error prog args infile message err-file))
+ (jka-compr-delete-temp-file err-file)))
+ ;; Run the uncompression program directly.
+ ;; We get the whole file and must delete what we don't want.
+ (jka-compr-call-process prog message infile t nil args))
;; Delete the stuff after what we want, if there is any.
(and
(defun jka-compr-call-process (prog message infile output temp args)
(if jka-compr-use-shell
- (let ((err-file (jka-compr-make-temp-name)))
-
+ (let ((err-file (jka-compr-make-temp-name))
+ (coding-system-for-read (or coding-system-for-read 'undecided))
+ (coding-system-for-write 'no-conversion))
+
(unwind-protect
(or (memq
(jka-compr-delete-temp-file err-file)))
- (or (zerop
+ (or (eq 0
(apply 'call-process
prog
infile
(jka-compr-error prog args infile message))
(and (stringp output)
- (let ((cbuf (current-buffer)))
- (set-buffer temp)
+ (with-current-buffer temp
(write-region (point-min) (point-max) output)
- (erase-buffer)
- (set-buffer cbuf)))))
+ (erase-buffer)))))
-;;; Support for temp files. Much of this was inspired if not lifted
-;;; from ange-ftp.
+;; Support for temp files. Much of this was inspired if not lifted
+;; from ange-ftp.
-(defvar jka-compr-temp-name-template
- "/tmp/jka-com"
+(defcustom jka-compr-temp-name-template
+ (expand-file-name "jka-com" temporary-file-directory)
"Prefix added to all temp files created by jka-compr.
-There should be no more than seven characters after the final `/'")
-
-(defvar jka-compr-temp-name-table (make-vector 31 nil))
+There should be no more than seven characters after the final `/'."
+ :type 'string
+ :group 'jka-compr)
(defun jka-compr-make-temp-name (&optional local-copy)
"This routine will return the name of a new file."
- (let* ((lastchar ?a)
- (prevchar ?a)
- (template (concat jka-compr-temp-name-template "aa"))
- (lastpos (1- (length template)))
- (not-done t)
- file
- entry)
+ (make-temp-file jka-compr-temp-name-template))
- (while not-done
- (aset template lastpos lastchar)
- (setq file (concat (make-temp-name template) "#"))
- (setq entry (intern file jka-compr-temp-name-table))
- (if (or (get entry 'active)
- (file-exists-p file))
-
- (progn
- (setq lastchar (1+ lastchar))
- (if (> lastchar ?z)
- (progn
- (setq prevchar (1+ prevchar))
- (setq lastchar ?a)
- (if (> prevchar ?z)
- (error "Can't allocate temp file.")
- (aset template (1- lastpos) prevchar)))))
-
- (put entry 'active (not local-copy))
- (setq not-done nil)))
-
- file))
-
-
-(defun jka-compr-delete-temp-file (temp)
-
- (put (intern temp jka-compr-temp-name-table)
- 'active nil)
-
- (condition-case ()
- (delete-file temp)
- (error nil)))
+(defalias 'jka-compr-delete-temp-file 'delete-file)
(defun jka-compr-write-region (start end file &optional append visit)
(let* ((filename (expand-file-name file))
(visit-file (if (stringp visit) (expand-file-name visit) filename))
- (info (jka-compr-get-compression-info visit-file)))
-
- (if info
-
- (let ((can-append (jka-compr-info-can-append info))
- (compress-program (jka-compr-info-compress-program info))
- (compress-message (jka-compr-info-compress-message info))
- (uncompress-program (jka-compr-info-uncompress-program info))
- (uncompress-message (jka-compr-info-uncompress-message info))
- (compress-args (jka-compr-info-compress-args info))
- (uncompress-args (jka-compr-info-uncompress-args info))
- (base-name (file-name-nondirectory visit-file))
- temp-file cbuf temp-buffer)
-
- (setq cbuf (current-buffer)
- temp-buffer (get-buffer-create " *jka-compr-wr-temp*"))
- (set-buffer temp-buffer)
- (widen) (erase-buffer)
- (set-buffer cbuf)
-
- (if (and append
- (not can-append)
- (file-exists-p filename))
-
- (let* ((local-copy (file-local-copy filename))
- (local-file (or local-copy filename)))
-
- (setq temp-file local-file))
-
- (setq temp-file (jka-compr-make-temp-name)))
-
- (and
- compress-message
- (message "%s %s..." compress-message base-name))
-
- (jka-compr-run-real-handler 'write-region
- (list start end temp-file t 'dont))
+ (info (jka-compr-get-compression-info visit-file))
+ (magic (and info (jka-compr-info-file-magic-bytes info))))
+
+ ;; If START is nil, use the whole buffer.
+ (if (null start)
+ (setq start 1 end (1+ (buffer-size))))
+
+ ;; If we uncompressed this file when visiting it,
+ ;; then recompress it when writing it
+ ;; even if the contents look compressed already.
+ (if (and jka-compr-really-do-compress
+ (eq start 1)
+ (eq end (1+ (buffer-size))))
+ (setq magic nil))
+
+ (if (and info
+ ;; If the contents to be written out
+ ;; are properly compressed already,
+ ;; don't try to compress them over again.
+ (not (and magic
+ (equal (if (stringp start)
+ (substring start 0 (min (length start)
+ (length magic)))
+ (buffer-substring start
+ (min end
+ (+ start (length magic)))))
+ magic))))
+ (let ((can-append (jka-compr-info-can-append info))
+ (compress-program (jka-compr-info-compress-program info))
+ (compress-message (jka-compr-info-compress-message info))
+ (compress-args (jka-compr-info-compress-args info))
+ (base-name (file-name-nondirectory visit-file))
+ temp-file temp-buffer
+ ;; we need to leave `last-coding-system-used' set to its
+ ;; value after calling write-region the first time, so
+ ;; that `basic-save-buffer' sees the right value.
+ (coding-system-used last-coding-system-used))
+
+ (or compress-program
+ (error "No compression program defined"))
+
+ (setq temp-buffer (get-buffer-create " *jka-compr-wr-temp*"))
+ (with-current-buffer temp-buffer
+ (widen) (erase-buffer))
+
+ (if (and append
+ (not can-append)
+ (file-exists-p filename))
+
+ (let* ((local-copy (file-local-copy filename))
+ (local-file (or local-copy filename)))
+
+ (setq temp-file local-file))
+
+ (setq temp-file (jka-compr-make-temp-name)))
+
+ (and
+ compress-message
+ (message "%s %s..." compress-message base-name))
+
+ (jka-compr-run-real-handler 'write-region
+ (list start end temp-file t 'dont))
+ ;; save value used by the real write-region
+ (setq coding-system-used last-coding-system-used)
+ ;; Here we must read the output of compress program as is
+ ;; without any code conversion.
+ (let ((coding-system-for-read 'no-conversion))
(jka-compr-call-process compress-program
(concat compress-message
" " base-name)
temp-file
temp-buffer
nil
- compress-args)
+ compress-args))
- (set-buffer temp-buffer)
- (jka-compr-run-real-handler 'write-region
- (list (point-min) (point-max)
- filename
- (and append can-append) 'dont))
- (erase-buffer)
- (set-buffer cbuf)
+ (with-current-buffer temp-buffer
+ (let ((coding-system-for-write 'no-conversion))
+ (if (memq system-type '(ms-dos windows-nt))
+ (setq buffer-file-type t) )
+ (jka-compr-run-real-handler 'write-region
+ (list (point-min) (point-max)
+ filename
+ (and append can-append) 'dont))
+ (erase-buffer)) )
- (jka-compr-delete-temp-file temp-file)
+ (jka-compr-delete-temp-file temp-file)
- (and
- compress-message
- (message "%s %s...done" compress-message base-name))
+ (and
+ compress-message
+ (message "%s %s...done" compress-message base-name))
+
+ (cond
+ ((eq visit t)
+ (setq buffer-file-name filename)
+ (setq jka-compr-really-do-compress t)
+ (set-visited-file-modtime))
+ ((stringp visit)
+ (setq buffer-file-name visit)
+ (let ((buffer-file-name filename))
+ (set-visited-file-modtime))))
- (cond
- ((eq visit t)
- (setq buffer-file-name filename)
- (set-visited-file-modtime))
- ((stringp visit)
- (setq buffer-file-name visit)
- (let ((buffer-file-name filename))
- (set-visited-file-modtime))))
+ (and (or (eq visit t)
+ (eq visit nil)
+ (stringp visit))
+ (message "Wrote %s" visit-file))
- (and (or (eq visit t)
- (eq visit nil)
- (stringp visit))
- (message "Wrote %s" visit-file))
+ ;; ensure `last-coding-system-used' has an appropriate value
+ (setq last-coding-system-used coding-system-used)
- nil)
-
- (jka-compr-run-real-handler 'write-region
- (list start end filename append visit)))))
+ nil)
+
+ (jka-compr-run-real-handler 'write-region
+ (list start end filename append visit)))))
(defun jka-compr-insert-file-contents (file &optional visit beg end replace)
(unwind-protect ; to make sure local-copy gets deleted
(progn
-
+
(and
uncompress-message
(message "%s %s..." uncompress-message base-name))
(condition-case error-code
- (progn
+ (let ((coding-system-for-read 'no-conversion))
(if replace
(goto-char (point-min)))
(setq start (point))
uncompress-args)))
(setq size (- (point) start))
(if replace
- (let* ((del-beg (point))
- (del-end (+ del-beg size)))
- (delete-region del-beg
- (min del-end (point-max)))))
+ (delete-region (point) (point-max)))
(goto-char start))
(error
+ ;; If the file we wanted to uncompress does not exist,
+ ;; handle that according to VISIT as `insert-file-contents'
+ ;; would, maybe signaling the same error it normally would.
(if (and (eq (car error-code) 'file-error)
(eq (nth 3 error-code) local-file))
(if visit
(setq notfound error-code)
- (signal 'file-error
+ (signal 'file-error
(cons "Opening input file"
(nthcdr 2 error-code))))
+ ;; If the uncompression program can't be found,
+ ;; signal that as a non-file error
+ ;; so that find-file-noselect-1 won't handle it.
+ (if (and (eq (car error-code) 'file-error)
+ (equal (cadr error-code) "Searching for program"))
+ (error "Uncompression program `%s' not found"
+ (nth 3 error-code)))
(signal (car error-code) (cdr error-code))))))
(and
(file-exists-p local-copy)
(delete-file local-copy)))
+ (unless notfound
+ (decode-coding-inserted-region
+ (point) (+ (point) size)
+ (jka-compr-byte-compiler-base-file-name file)
+ visit beg end replace))
+
(and
visit
(progn
(unlock-buffer)
(setq buffer-file-name filename)
+ (setq jka-compr-really-do-compress t)
(set-visited-file-modtime)))
-
+
(and
uncompress-message
(message "%s %s...done" uncompress-message base-name))
(signal 'file-error
(cons "Opening input file" (nth 2 notfound))))
- ;; Run the functions that insert-file-contents would.
- (let ((p after-insert-file-functions)
- (insval size))
- (while p
- (setq insval (funcall (car p) size))
- (if insval
- (progn
- (or (integerp insval)
- (signal 'wrong-type-argument
- (list 'integerp insval)))
- (setq size insval)))
- (setq p (cdr p))))
+ ;; This is done in insert-file-contents after we return.
+ ;; That is a little weird, but better to go along with it now
+ ;; than to change it now.
+
+;;; ;; Run the functions that insert-file-contents would.
+;;; (let ((p after-insert-file-functions)
+;;; (insval size))
+;;; (while p
+;;; (setq insval (funcall (car p) size))
+;;; (if insval
+;;; (progn
+;;; (or (integerp insval)
+;;; (signal 'wrong-type-argument
+;;; (list 'integerp insval)))
+;;; (setq size insval)))
+;;; (setq p (cdr p))))
+
+ (or (jka-compr-info-compress-program info)
+ (message "You can't save this buffer because compression program is not defined"))
(list filename size))
(jka-compr-run-real-handler 'file-local-copy (list filename)))
(temp-file (jka-compr-make-temp-name t))
(temp-buffer (get-buffer-create " *jka-compr-flc-temp*"))
- (notfound nil)
- (cbuf (current-buffer))
local-file)
(setq local-file (or local-copy filename))
(unwind-protect
- (progn
-
- (and
- uncompress-message
- (message "%s %s..." uncompress-message base-name))
-
- (set-buffer temp-buffer)
-
- (jka-compr-call-process uncompress-program
- (concat uncompress-message
- " " base-name)
- local-file
- t
- nil
- uncompress-args)
+ (with-current-buffer temp-buffer
(and
uncompress-message
- (message "%s %s...done" uncompress-message base-name))
+ (message "%s %s..." uncompress-message base-name))
- (write-region
- (point-min) (point-max) temp-file nil 'dont))
+ ;; Here we must read the output of uncompress program
+ ;; and write it to TEMP-FILE without any code
+ ;; conversion. An appropriate code conversion (if
+ ;; necessary) is done by the later I/O operation
+ ;; (e.g. load).
+ (let ((coding-system-for-read 'no-conversion)
+ (coding-system-for-write 'no-conversion))
+
+ (jka-compr-call-process uncompress-program
+ (concat uncompress-message
+ " " base-name)
+ local-file
+ t
+ nil
+ uncompress-args)
+
+ (and
+ uncompress-message
+ (message "%s %s...done" uncompress-message base-name))
+
+ (write-region
+ (point-min) (point-max) temp-file nil 'dont)))
(and
local-copy
(file-exists-p local-copy)
(delete-file local-copy))
- (set-buffer cbuf)
(kill-buffer temp-buffer))
temp-file)
-
+
(jka-compr-run-real-handler 'file-local-copy (list filename)))))
-;;; Support for loading compressed files.
+;; Support for loading compressed files.
(defun jka-compr-load (file &optional noerror nomessage nosuffix)
"Documented as original."
(or nomessage
(message "Loading %s..." file))
- (load load-file noerror t t)
-
+ (let ((load-force-doc-strings t))
+ (load load-file noerror t t))
(or nomessage
- (message "Loading %s...done." file)))
+ (message "Loading %s...done." file))
+ ;; Fix up the load history to point at the right library.
+ (let ((l (assoc load-file load-history)))
+ ;; Remove .gz and .elc?.
+ (while (file-name-extension file)
+ (setq file (file-name-sans-extension file)))
+ (setcar l file)))
(jka-compr-delete-temp-file local-copy))
t))
+
+(defun jka-compr-byte-compiler-base-file-name (file)
+ (let ((info (jka-compr-get-compression-info file)))
+ (if (and info (jka-compr-info-strip-extension info))
+ (save-match-data
+ (substring file 0 (string-match (jka-compr-info-regexp info) file)))
+ file)))
\f
(put 'write-region 'jka-compr 'jka-compr-write-region)
(put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents)
(put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy)
(put 'load 'jka-compr 'jka-compr-load)
+(put 'byte-compiler-base-file-name 'jka-compr
+ 'jka-compr-byte-compiler-base-file-name)
+
+;;;###autoload
+(defvar jka-compr-inhibit nil
+ "Non-nil means inhibit automatic uncompression temporarily.
+Lisp programs can bind this to t to do that.
+It is not recommended to set this variable permanently to anything but nil.")
+;;;###autoload
(defun jka-compr-handler (operation &rest args)
(save-match-data
(let ((jka-op (get operation 'jka-compr)))
- (if jka-op
+ (if (and jka-op (not jka-compr-inhibit))
(apply jka-op args)
(jka-compr-run-real-handler operation args)))))
(inhibit-file-name-operation operation))
(apply operation args)))
-(defun toggle-auto-compression (arg)
- "Toggle automatic file compression and decompression.
-With prefix argument ARG, turn auto compression on if positive, else off.
-Returns the new status of auto compression (non-nil means on)."
- (interactive "P")
- (let* ((installed (jka-compr-installed-p))
- (flag (if (null arg)
- (not installed)
- (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0))))))
-
- (cond
- ((and flag installed) t) ; already installed
-
- ((and (not flag) (not installed)) nil) ; already not installed
-
- (flag
- (jka-compr-install))
-
- (t
- (jka-compr-uninstall)))
-
-
- (and (interactive-p)
- (if flag
- (message "Automatic file (de)compression is now ON.")
- (message "Automatic file (de)compression is now OFF.")))
-
- flag))
-
-
-(defun jka-compr-build-file-regexp ()
- (concat
- "\\("
- (mapconcat
- 'jka-compr-info-regexp
- jka-compr-compression-info-list
- "\\)\\|\\(")
- "\\)"))
-
-
-(defun jka-compr-install ()
- "Install jka-compr.
-This adds entries to `file-name-handler-alist' and `auto-mode-alist'
-and `inhibit-first-line-modes-suffixes'."
-
- (setq jka-compr-file-name-handler-entry
- (cons (jka-compr-build-file-regexp) 'jka-compr-handler))
-
- (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry
- file-name-handler-alist))
-
- (mapcar
- (function (lambda (x)
- (and (jka-compr-info-strip-extension x)
- ;; Make entries in auto-mode-alist so that modes
- ;; are chosen right according to the file names
- ;; sans `.gz'.
- (setq auto-mode-alist
- (cons (list (jka-compr-info-regexp x)
- nil 'jka-compr)
- auto-mode-alist))
- ;; Also add these regexps to
- ;; inhibit-first-line-modes-suffixes, so that a
- ;; -*- line in the first file of a compressed tar
- ;; file doesn't override tar-mode.
- (setq inhibit-first-line-modes-suffixes
- (cons (jka-compr-info-regexp x)
- inhibit-first-line-modes-suffixes)))))
- jka-compr-compression-info-list)
- (setq auto-mode-alist
- (append auto-mode-alist jka-compr-mode-alist-additions)))
-
-
+;;;###autoload
(defun jka-compr-uninstall ()
"Uninstall jka-compr.
This removes the entries in `file-name-handler-alist' and `auto-mode-alist'
(eq (nth 2 entry) 'jka-compr)))
(setcdr last (cdr (cdr last)))
(setq last (cdr last))))
-
- (setq auto-mode-alist (cdr ama))))
-
-
-(defun jka-compr-installed-p ()
- "Return non-nil if jka-compr is installed.
-The return value is the entry in `file-name-handler-alist' for jka-compr."
-
- (let ((fnha file-name-handler-alist)
- (installed nil))
-
- (while (and fnha (not installed))
- (and (eq (cdr (car fnha)) 'jka-compr-handler)
- (setq installed (car fnha)))
- (setq fnha (cdr fnha)))
-
- installed))
-
-;;; Add the file I/O hook if it does not already exist.
-;;; Make sure that jka-compr-file-name-handler-entry is eq to the
-;;; entry for jka-compr in file-name-handler-alist.
-(and (jka-compr-installed-p)
- (jka-compr-uninstall))
+ (setq auto-mode-alist (cdr ama)))
-(jka-compr-install)
+ (while jka-compr-added-to-file-coding-system-alist
+ (setq file-coding-system-alist
+ (delq (car (member (pop jka-compr-added-to-file-coding-system-alist)
+ file-coding-system-alist))
+ file-coding-system-alist)))
+ ;; Remove the suffixes that were added by jka-compr.
+ (let ((suffixes nil)
+ (re (jka-compr-build-file-regexp)))
+ (dolist (suffix load-suffixes)
+ (unless (string-match re suffix)
+ (push suffix suffixes)))
+ (setq load-suffixes (nreverse suffixes))))
(provide 'jka-compr)
-;; jka-compr.el ends here.
+;; arch-tag: 3f15b630-e9a7-46c4-a22a-94afdde86ebc
+;;; jka-compr.el ends here