Split off features about coding-system from poem-e20_2.el.

diff --git a/pces-e20_2.el b/pces-e20_2.el
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+;;; -*-byte-compile-dynamic: t;-*-
+;;; pces-e20_2.el --- pces implementation for Emacs 20.1 and 20.2
+
+;; Copyright (C) 1996,1997,1998,1999 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <tomo@m17n.org>
+;; Keywords: emulation, compatibility, Mule
+
+;; This file is part of APEL (A Portable Emacs Library).
+
+;; 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 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 module requires Emacs 20.1 and 20.2.
+
+;;; Code:
+
+;;; @ without code-conversion
+;;;
+
+(defun insert-file-contents-as-binary (filename
+                                      &optional visit beg end replace)
+  "Like `insert-file-contents', q.v., but don't code and format conversion.
+Like `insert-file-contents-literary', but it allows find-file-hooks,
+automatic uncompression, etc.
+
+Namely this function ensures that only format decoding and character
+code conversion will not take place."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read 'binary)
+       format-alist)
+    (prog1
+       ;; Returns list absolute file name and length of data inserted.
+       (insert-file-contents filename visit beg end replace)
+      ;; This operation does not change the length.
+      (set-buffer-multibyte flag))))
+
+(defun insert-file-contents-as-raw-text (filename
+                                        &optional visit beg end replace)
+  "Like `insert-file-contents', q.v., but don't code and format conversion.
+Like `insert-file-contents-literary', but it allows find-file-hooks,
+automatic uncompression, etc.
+Like `insert-file-contents-as-binary', but it converts line-break
+code."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read 'raw-text)
+       format-alist)
+    (prog1
+       ;; Returns list absolute file name and length of data inserted.
+       (insert-file-contents filename visit beg end replace)
+      ;; This operation does not change the length.
+      (set-buffer-multibyte flag))))
+
+(defun insert-file-contents-as-raw-text-CRLF (filename
+                                             &optional visit beg end replace)
+  "Like `insert-file-contents', q.v., but don't code and format conversion.
+Like `insert-file-contents-literary', but it allows find-file-hooks,
+automatic uncompression, etc.
+Like `insert-file-contents-as-binary', but it converts line-break code
+from CRLF to LF."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read 'raw-text-dos)
+       format-alist)
+    (prog1
+       ;; Returns list absolute file name and length of data inserted.
+       (insert-file-contents filename visit beg end replace)
+      ;; This operation does not change the length.
+      (set-buffer-multibyte flag))))
+
+(defun find-file-noselect-as-binary (filename &optional nowarn rawfile)
+  "Like `find-file-noselect', q.v., but don't code and format conversion."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read 'binary)
+       format-alist)
+    (save-current-buffer
+      (prog1
+         (set-buffer (find-file-noselect filename nowarn rawfile))
+       (set-buffer-multibyte flag)))))
+
+(defun find-file-noselect-as-raw-text (filename &optional nowarn rawfile)
+  "Like `find-file-noselect', q.v., but it does not code and format conversion
+except for line-break code."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read 'raw-text)
+       format-alist)
+    (save-current-buffer
+      (prog1
+         (set-buffer (find-file-noselect filename nowarn rawfile))
+       (set-buffer-multibyte flag)))))
+
+(defun find-file-noselect-as-raw-text-CRLF (filename &optional nowarn rawfile)
+  "Like `find-file-noselect', q.v., but it does not code and format conversion
+except for line-break code."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read 'raw-text-dos)
+       format-alist)
+    (save-current-buffer
+      (prog1
+         (set-buffer (find-file-noselect filename nowarn rawfile))
+       (set-buffer-multibyte flag)))))
+
+
+;;; @ with code-conversion
+;;;
+
+(defun insert-file-contents-as-coding-system
+  (coding-system filename &optional visit beg end replace)
+  "Like `insert-file-contents', q.v., but CODING-SYSTEM the first arg will
+be applied to `coding-system-for-read'."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read coding-system)
+       format-alist)
+    (prog1
+       (insert-file-contents filename visit beg end replace)
+      (set-buffer-multibyte flag))))
+
+(defun find-file-noselect-as-coding-system
+  (coding-system filename &optional nowarn rawfile)
+  "Like `find-file-noselect', q.v., but CODING-SYSTEM the first arg will
+be applied to `coding-system-for-read'."
+  (let ((flag enable-multibyte-characters)
+       (coding-system-for-read coding-system)
+       format-alist)
+    (save-current-buffer
+      (prog1
+         (set-buffer (find-file-noselect filename nowarn rawfile))
+       (set-buffer-multibyte flag)))))
+
+
+;;; @ end
+;;;
+
+(provide 'pces-e20_2)
+
+;;; pces-e20_2.el ends here