hexl-max-address in hexl-mode is incorrect

[Ye Wenbin]

You can test like this:
Test case 1:
In *scratch* buffer, erase the buffer, and choose TeX input method,
input two multibyte characters, such as "«»", which can display in my
emacs. Then change to hexl-mode. Use C-f to move point. You can see
the cursor can't arrive to the last byte. Use C-h v hexl-max-address
to see the value of hexl-max-address. The hexl-max-address is 2 which
is the buffer-size of *scratch*.

Test case 2:
Open a new file, such as /tmp/test.txt. Use C-x RET f to set the file
coding system to utf-16. Input any letters such as "ab", and save the
buffer. Then change mode to hexl-mode. C-h v hexl-max-address show the
value is still 2 which is the buffer-size rather than the sizze of the
file.

====================================================================


In GNU Emacs 22.0.50.1 (i486-pc-linux-gnu, GTK+ Version 2.8.17)
 of 2006-08-24 on vernadsky, modified by Debian
 (Debian emacs-snapshot package, version 1:20060707-1~dapper1)
X server distributor `The X.Org Foundation', version 11.0.70000000
configured using `configure '--build' 'i486-linux-gnu' '--host'  
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'  
'--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info'  
'--mandir=/usr/share/man' '--with-pop=yes'  
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/22.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.0.50/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.0.50/leim'  
'--with-x=yes' '--with-x-toolkit=gtk' 'CFLAGS=-DDEBIAN -g -O2'  
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: zh_CN.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Hexl

Minor modes in effect:
  shell-dirtrack-mode: t
  icomplete-mode: t
  partial-completion-mode: t
  desktop-save-mode: t
  auto-image-file-mode: t
  show-paren-mode: t
  encoded-kbd-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <down-mouse-1> <mouse-1> SPC <down-mouse-5>
<mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5>
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<triple-down-mouse-5> <triple-mouse-5> <down-mouse-5>
<mouse-5> <double-down-mouse-5> <double-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<triple-down-mouse-5> <triple-mouse-5> <down-mouse-5>
<mouse-5> <double-down-mouse-5> <double-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<triple-down-mouse-5> <triple-mouse-5> <down-mouse-5>
<mouse-5> <double-down-mouse-5> <double-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<triple-down-mouse-5> <triple-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> SPC <down-mouse-5> <mouse-5> <double-down-mouse-5>
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<triple-down-mouse-5> <triple-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<triple-down-mouse-5> <triple-mouse-5> <triple-down-mouse-5>
<triple-mouse-5> <triple-down-mouse-5> <triple-mouse-5>
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4>
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4>
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4>
<help-echo> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> M-x r e p o r - <backspace> <tab> <retur
n>

Recent messages:
Char: » (2235, #o4273, #x8bb, file ...) point=2 of 2 (50%) column=1
Loading hexl...done
Converting to hexl format discards undo info; ok? (y or n)
hexl-goto-address: Out of hexl region [6 times]
uncompressing emacs.gz...done
uncompressing emacs-1.gz...done
Mark saved where search started [2 times]
uncompressing emacs-5.gz...done
byte-code: End of buffer [3 times]
Loading emacsbug...done


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