--- /dev/null
+;;; po.el --- basic support of PO translation files -*- coding: latin-1; -*-
+
+;; Copyright (C) 1995-1998, 2000-2002 Free Software Foundation, Inc.
+
+;; Authors: François Pinard <pinard@iro.umontreal.ca>,
+;; Greg McGary <gkm@magilla.cichlid.com>,
+;; Bruno Haible <bruno@clisp.org>.
+;; Keywords: i18n, files
+
+;; 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.
+
+;;; Commentary:
+
+;; This package makes sure visiting PO files decodes them correctly,
+;; according to the Charset= header in the PO file. For more support
+;; for editing PO files, see po-mode.el.
+
+;;; Code:
+
+; Make the cpnnn codesets available.
+(if (not (string-match "XEmacs\\|Lucid" emacs-version))
+ (mapc #'codepage-setup (mapcar #'car (cp-supported-codepages))))
+
+(defconst po-content-type-charset-alist
+ '(; Note: Emacs 21 doesn't support all encodings, thus the missing entries.
+ (ASCII . undecided)
+ (ANSI_X3.4-1968 . undecided)
+ (US-ASCII . undecided)
+ (ISO-8859-1 . iso-8859-1)
+ (ISO_8859-1 . iso-8859-1)
+ (ISO-8859-2 . iso-8859-2)
+ (ISO_8859-2 . iso-8859-2)
+ (ISO-8859-3 . iso-8859-3)
+ (ISO_8859-3 . iso-8859-3)
+ (ISO-8859-4 . iso-8859-4)
+ (ISO_8859-4 . iso-8859-4)
+ (ISO-8859-5 . iso-8859-5)
+ (ISO_8859-5 . iso-8859-5)
+ ;(ISO-8859-6 . ??)
+ ;(ISO_8859-6 . ??)
+ (ISO-8859-7 . iso-8859-7)
+ (ISO_8859-7 . iso-8859-7)
+ (ISO-8859-8 . iso-8859-8)
+ (ISO_8859-8 . iso-8859-8)
+ (ISO-8859-9 . iso-8859-9)
+ (ISO_8859-9 . iso-8859-9)
+ ;(ISO-8859-13 . ??)
+ ;(ISO_8859-13 . ??)
+ (ISO-8859-15 . iso-8859-15) ; requires Emacs 21
+ (ISO_8859-15 . iso-8859-15) ; requires Emacs 21
+ (KOI8-R . koi8-r)
+ ;(KOI8-U . ??)
+ (CP437 . cp437) ; requires Emacs 20
+ (CP775 . cp775) ; requires Emacs 20
+ (CP850 . cp850) ; requires Emacs 20
+ (CP852 . cp852) ; requires Emacs 20
+ (CP855 . cp855) ; requires Emacs 20
+ ;(CP856 . ??)
+ (CP857 . cp857) ; requires Emacs 20
+ (CP861 . cp861) ; requires Emacs 20
+ (CP862 . cp862) ; requires Emacs 20
+ (CP864 . cp864) ; requires Emacs 20
+ (CP865 . cp865) ; requires Emacs 20
+ (CP866 . cp866) ; requires Emacs 21
+ (CP869 . cp869) ; requires Emacs 20
+ ;(CP874 . ??)
+ ;(CP922 . ??)
+ ;(CP932 . ??)
+ ;(CP943 . ??)
+ ;(CP949 . ??)
+ ;(CP950 . ??)
+ ;(CP1046 . ??)
+ ;(CP1124 . ??)
+ ;(CP1129 . ??)
+ (CP1250 . cp1250) ; requires Emacs 20
+ (CP1251 . cp1251) ; requires Emacs 20
+ (CP1252 . iso-8859-1) ; approximation
+ (CP1253 . cp1253) ; requires Emacs 20
+ (CP1254 . iso-8859-9) ; approximation
+ (CP1255 . iso-8859-8) ; approximation
+ ;(CP1256 . ??)
+ (CP1257 . cp1257) ; requires Emacs 20
+ (GB2312 . cn-gb-2312) ; also named 'gb2312' in XEmacs 21 or Emacs 21
+ ; also named 'euc-cn' in Emacs 20 or Emacs 21
+ (EUC-JP . euc-jp)
+ (EUC-KR . euc-kr)
+ ;(EUC-TW . ??)
+ (BIG5 . big5)
+ ;(BIG5-HKSCS . ??)
+ ;(GBK . ??)
+ ;(GB18030 . ??)
+ (SHIFT_JIS . shift_jis)
+ ;(JOHAB . ??)
+ (TIS-620 . tis-620) ; requires Emacs 20 or Emacs 21
+ (VISCII . viscii) ; requires Emacs 20 or Emacs 21
+ (UTF-8 . utf-8) ; requires Mule-UCS in Emacs 20, or Emacs 21
+ )
+ "How to convert a GNU libc/libiconv canonical charset name as seen in
+Content-Type into a Mule coding system.")
+
+(defun po-find-charset (filename)
+ "Return PO file charset value."
+ (interactive)
+ (let ((charset-regexp
+ "^\"Content-Type: text/plain;[ \t]*charset=\\(.*\\)\\\\n\"")
+ (short-read nil))
+ ;; Try the first 4096 bytes. In case we cannot find the charset value
+ ;; within the first 4096 bytes (the PO file might start with a long
+ ;; comment) try the next 4096 bytes repeatedly until we'll know for sure
+ ;; we've checked the empty header entry entirely.
+ (while (not (or short-read (re-search-forward "^msgid" nil t)))
+ (save-excursion
+ (goto-char (point-max))
+ (let ((pair (insert-file-contents-literally filename nil
+ (1- (point))
+ (1- (+ (point) 4096)))))
+ (setq short-read (< (nth 1 pair) 4096)))))
+ (cond (short-read nil)
+ ((re-search-forward charset-regexp nil t) (match-string 1))
+ ;; We've found the first msgid; maybe, only a part of the msgstr
+ ;; value was loaded. Load the next 1024 bytes; if charset still
+ ;; isn't available, give up.
+ (t (save-excursion
+ (goto-char (point-max))
+ (insert-file-contents-literally filename nil
+ (1- (point))
+ (1- (+ (point) 1024))))
+ (if (re-search-forward charset-regexp nil t)
+ (match-string 1))))))
+
+(defun po-find-file-coding-system-guts (operation filename)
+ "\
+Return a Mule (DECODING . ENCODING) pair, according to PO file charset.
+Called through file-coding-system-alist, before the file is visited for real."
+ (and (eq operation 'insert-file-contents)
+ (file-exists-p filename)
+ (po-with-temp-buffer
+ (let* ((coding-system-for-read 'no-conversion)
+ (charset (or (po-find-charset filename) "ascii"))
+ (charset-upper (intern (upcase charset)))
+ (charset-lower (intern (downcase charset))))
+ (list (or (cdr (assq charset-upper po-content-type-charset-alist))
+ (if (memq charset-lower (coding-system-list))
+ charset-lower
+ 'no-conversion)))))))
+
+;;;###autoload
+(defun po-find-file-coding-system (arg-list)
+ "\
+Return a Mule (DECODING . ENCODING) pair, according to PO file charset.
+Called through file-coding-system-alist, before the file is visited for real."
+ (po-find-file-coding-system-guts (car arg-list) (car (cdr arg-list))))
+;; This is for XEmacs.
+;(defun po-find-file-coding-system (operation filename)
+; "\
+;Return a Mule (DECODING . ENCODING) pair, according to PO file charset.
+;Called through file-coding-system-alist, before the file is visited for real."
+; (po-find-file-coding-system-guts operation filename))
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