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authorStefan Monnier <monnier@iro.umontreal.ca>2004-04-04 01:21:46 +0000
committerStefan Monnier <monnier@iro.umontreal.ca>2004-04-04 01:21:46 +0000
commit8c8b8430b557f8f1503bfecce39b6f2938665e5a (patch)
tree1ed7295c23b469148f8996b6b37b11e9936fb7a1 /lisp/url/url-file.el
parent5c84686c48f49474e4b5b59ab859ff56fc7248d2 (diff)
downloademacs-8c8b8430b557f8f1503bfecce39b6f2938665e5a.tar.gz
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+;;; url-file.el --- File retrieval code
+;; Author: $Author: fx $
+;; Created: $Date: 2002/04/22 09:14:24 $
+;; Version: $Revision: 1.11 $
+;; Keywords: comm, data, processes
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; Copyright (c) 1993 - 1996 by William M. Perry <wmperry@cs.indiana.edu>
+;;; Copyright (c) 1996 - 1999 Free Software Foundation, Inc.
+;;;
+;;; 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., 59 Temple Place - Suite 330,
+;;; Boston, MA 02111-1307, USA.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(eval-when-compile (require 'cl))
+(require 'mailcap)
+(require 'url-vars)
+(require 'url-parse)
+(require 'url-dired)
+
+(defconst url-file-default-port 21 "Default FTP port.")
+(defconst url-file-asynchronous-p t "FTP transfers are asynchronous.")
+(defalias 'url-file-expand-file-name 'url-default-expander)
+
+(defun url-file-find-possibly-compressed-file (fname &rest args)
+ "Find the exact file referenced by `fname'.
+This tries the common compression extensions, because things like
+ange-ftp and efs are not quite smart enough to realize when a server
+can do automatic decompression for them, and won't find 'foo' if
+'foo.gz' exists, even though the ftp server would happily serve it up
+to them."
+ (let ((scratch nil)
+ (compressed-extensions '("" ".gz" ".z" ".Z" ".bz2"))
+ (found nil))
+ (while (and compressed-extensions (not found))
+ (if (file-exists-p (setq scratch (concat fname (pop compressed-extensions))))
+ (setq found scratch)))
+ found))
+
+(defun url-file-host-is-local-p (host)
+ "Return t iff HOST references our local machine."
+ (let ((case-fold-search t))
+ (or
+ (null host)
+ (string= "" host)
+ (equal (downcase host) (downcase (system-name)))
+ (and (string-match "^localhost$" host) t)
+ (and (not (string-match (regexp-quote ".") host))
+ (equal (downcase host) (if (string-match (regexp-quote ".")
+ (system-name))
+ (substring (system-name) 0
+ (match-beginning 0))
+ (system-name)))))))
+
+(defun url-file-asynch-callback (x y name buff func args &optional efs)
+ (if (not (featurep 'ange-ftp))
+ ;; EFS passes us an extra argument
+ (setq name buff
+ buff func
+ func args
+ args efs))
+ (let ((size (nth 7 (file-attributes name))))
+ (save-excursion
+ (set-buffer buff)
+ (goto-char (point-max))
+ (if (/= -1 size)
+ (insert (format "Content-length: %d\n" size)))
+ (insert "\n")
+ (insert-file-contents-literally name)
+ (if (not (url-file-host-is-local-p (url-host url-current-object)))
+ (condition-case ()
+ (delete-file name)
+ (error nil)))
+ (apply func args))))
+
+(defun url-file-build-filename (url)
+ (if (not (vectorp url))
+ (setq url (url-generic-parse-url url)))
+ (let* ((user (url-user url))
+ (pass (url-password url))
+ (port (url-port url))
+ (host (url-host url))
+ (site (if (and port (/= port 21))
+ (if (featurep 'ange-ftp)
+ (format "%s %d" host port)
+ ;; This works in Emacs 21's ange-ftp too.
+ (format "%s#%d" host port))
+ host))
+ (file (url-unhex-string (url-filename url)))
+ (filename (if (or user (not (url-file-host-is-local-p host)))
+ (concat "/" (or user "anonymous") "@" site ":" file)
+ (if (and (memq system-type
+ '(emx ms-dos windows-nt ms-windows))
+ (string-match "^/[a-zA-Z]:/" file))
+ (substring file 1)
+ file)))
+ pos-index)
+
+ (and user pass
+ (cond
+ ((featurep 'ange-ftp)
+ (ange-ftp-set-passwd host user pass))
+ ((or (featurep 'efs) (featurep 'efs-auto))
+ (efs-set-passwd host user pass))
+ (t
+ nil)))
+
+ ;; This makes sure that directories have a trailing directory
+ ;; separator on them so URL expansion works right.
+ ;;
+ ;; FIXME? What happens if the remote system doesn't use our local
+ ;; directory-sep-char as its separator? Would it be safer to just
+ ;; use '/' unconditionally and rely on the FTP server to
+ ;; straighten it out for us?
+ (if (and (file-directory-p filename)
+ (not (string-match (format "%c$" directory-sep-char) filename)))
+ (url-set-filename url
+ (format "%s%c" filename directory-sep-char)))
+
+ ;; If it is a directory, look for an index file first.
+ (if (and (file-directory-p filename)
+ url-directory-index-file
+ (setq pos-index (expand-file-name url-directory-index-file filename))
+ (file-exists-p pos-index)
+ (file-readable-p pos-index))
+ (setq filename pos-index))
+
+ ;; Find the (possibly compressed) file
+ (setq filename (url-file-find-possibly-compressed-file filename))
+ filename))
+
+;;;###autoload
+(defun url-file (url callback cbargs)
+ "Handle file: and ftp: URLs."
+ (let* ((buffer nil)
+ (uncompressed-filename nil)
+ (content-type nil)
+ (content-encoding nil)
+ (coding-system-for-read 'binary))
+
+ (setq filename (url-file-build-filename url))
+
+ (if (not filename)
+ (error "File does not exist: %s" (url-recreate-url url)))
+
+ ;; Need to figure out the content-type from the real extension,
+ ;; not the compressed one.
+ (setq uncompressed-filename (if (string-match "\\.\\(gz\\|Z\\|z\\)$" filename)
+ (substring filename 0 (match-beginning 0))
+ filename))
+ (setq content-type (mailcap-extension-to-mime
+ (url-file-extension uncompressed-filename))
+ content-encoding (case (intern (url-file-extension filename))
+ ((\.z \.gz) "gzip")
+ (\.Z "compress")
+ (\.uue "x-uuencoded")
+ (\.hqx "x-hqx")
+ (\.bz2 "x-bzip2")
+ (otherwise nil)))
+
+ (if (file-directory-p filename)
+ ;; A directory is done the same whether we are local or remote
+ (url-find-file-dired filename)
+ (save-excursion
+ (setq buffer (generate-new-buffer " *url-file*"))
+ (set-buffer buffer)
+ (mm-disable-multibyte)
+ (setq url-current-object url)
+ (insert "Content-type: " (or content-type "application/octet-stream") "\n")
+ (if content-encoding
+ (insert "Content-transfer-encoding: " content-encoding "\n"))
+ (if (url-file-host-is-local-p (url-host url))
+ ;; Local files are handled slightly oddly
+ (if (featurep 'ange-ftp)
+ (url-file-asynch-callback nil nil
+ filename
+ (current-buffer)
+ callback cbargs)
+ (url-file-asynch-callback nil nil nil
+ filename
+ (current-buffer)
+ callback cbargs))
+ ;; FTP handling
+ (let* ((extension (url-file-extension filename))
+ (new (url-generate-unique-filename
+ (and (> (length extension) 0)
+ (concat "%s." extension)))))
+ (if (featurep 'ange-ftp)
+ (ange-ftp-copy-file-internal filename (expand-file-name new) t
+ nil t
+ (list 'url-file-asynch-callback
+ new (current-buffer)
+ callback cbargs)
+ t)
+ (autoload 'efs-copy-file-internal "efs")
+ (efs-copy-file-internal filename (efs-ftp-path filename)
+ new (efs-ftp-path new)
+ t nil 0
+ (list 'url-file-asynch-callback
+ new (current-buffer)
+ callback cbargs)
+ 0 nil))))))
+ buffer))
+
+(defmacro url-file-create-wrapper (method args)
+ (` (defalias (quote (, (intern (format "url-ftp-%s" method))))
+ (defun (, (intern (format "url-file-%s" method))) (, args)
+ (, (format "FTP/FILE URL wrapper around `%s' call." method))
+ (setq url (url-file-build-filename url))
+ (and url ((, method) (,@ (remove '&rest (remove '&optional args)))))))))
+
+(url-file-create-wrapper file-exists-p (url))
+(url-file-create-wrapper file-attributes (url))
+(url-file-create-wrapper file-symlink-p (url))
+(url-file-create-wrapper file-readable-p (url))
+(url-file-create-wrapper file-writable-p (url))
+(url-file-create-wrapper file-executable-p (url))
+(if (featurep 'xemacs)
+ (progn
+ (url-file-create-wrapper directory-files (url &optional full match nosort files-only))
+ (url-file-create-wrapper file-truename (url &optional default)))
+ (url-file-create-wrapper directory-files (url &optional full match nosort))
+ (url-file-create-wrapper file-truename (url &optional counter prev-dirs)))
+
+(provide 'url-file)