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580 lines
18 KiB
EmacsLisp
580 lines
18 KiB
EmacsLisp
;;; utf-16.el --- UTF-16 encoding/decoding
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;; Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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;; Copyright (C) 2002, 2003, 2004
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Author: Dave Love <fx@gnu.org>
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;; Keywords: Unicode, UTF-16, i18n
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; Support for UTF-16, which is a two-byte encoding (modulo
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;; surrogates) of Unicode, defined in RFC 2781. It is written either
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;; in little or big endian order and either with or without the
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;; leading BOM (a two-byte signature which identifies their byte sex).
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;;
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;; We provide these base coding systems.
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;; name endian BOM
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;; ---- ------ ---
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;; mule-utf-16le little no
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;; mule-utf-16be big no
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;; mule-utf-16le-with-signature little yes
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;; mule-utf-16be-with-signature big yes
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;; mule-utf-16 both yes
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;;
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;; Note that un-decodable sequences aren't (yet?) preserved as raw
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;; bytes, as they are with utf-8, so reading and writing as utf-16 can
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;; corrupt data.
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;;; Code:
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;; We end up with trivially different -le and -be versions of most
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;; things below, sometimes with commonality abstracted into a let
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;; binding for maintenance convenience.
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;; Needed in macro expansion, so can't be let-bound. Zapped after use.
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(eval-and-compile
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(defconst utf-16-decode-ucs
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;; If r5 is negative, r1 is a Unicode chacter code. Otherise, r5 is
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;; the first of a surrogate pair and r1 is the second of the pair.
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;; Output is charset ID in r0, code point in r1. R0 may be set to
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;; -1 in which case a caller should not write out r1.
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`((if (r5 >= 0)
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((r0 = (r1 < #xDC00))
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(if ((r1 >= #xE000) | r0)
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;; Invalid second code of surrogate pair.
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((r0 = r5)
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(call ccl-mule-utf-untrans))
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((r1 -= #xDC00)
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(r1 += (((r5 - #xD800) << 10) + #x10000))))
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(r5 = -1)))
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(if (r1 < 128)
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(r0 = ,(charset-id 'ascii))
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((lookup-integer utf-subst-table-for-decode r1 r3)
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(if r7 ; got a translation
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((r0 = r1) (r1 = r3))
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(if (r1 < 160)
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(r0 = ,(charset-id 'eight-bit-control))
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(if (r1 < 256)
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((r0 = ,(charset-id 'latin-iso8859-1))
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(r1 -= 128))
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(if (r1 < #x2500)
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((r0 = ,(charset-id 'mule-unicode-0100-24ff))
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(r1 -= #x100)
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(r2 = (((r1 / 96) + 32) << 7))
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(r1 %= 96)
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(r1 += (r2 + 32)))
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(if (r1 < #x3400)
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((r0 = ,(charset-id 'mule-unicode-2500-33ff))
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(r1 -= #x2500)
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(r2 = (((r1 / 96) + 32) << 7))
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(r1 %= 96)
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(r1 += (r2 + 32)))
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(if (r1 < #xD800)
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;; We can't have this character.
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((r0 = r1)
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(call ccl-mule-utf-untrans)
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(r5 = -1)
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(r0 = -1))
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(if (r1 < #xDC00)
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;; The first code of a surrogate pair.
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((r5 = r1)
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(r0 = -1))
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(if (r1 < #xE000)
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;; The second code of a surrogate pair, invalid.
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((r0 = r1)
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(call ccl-mule-utf-untrans)
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(r5 = -1)
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(r0 = -1))
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(if (r1 < #x10000)
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((r0 = ,(charset-id 'mule-unicode-e000-ffff))
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(r1 -= #xE000)
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(r2 = (((r1 / 96) + 32) << 7))
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(r1 %= 96)
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(r1 += (r2 + 32)))
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;; We can't have this character.
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((r0 = r1)
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(call ccl-mule-utf-untrans)
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(r5 = -1)
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(r0 = -1)))))))))))))))
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(defconst utf-16le-decode-loop
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`((r5 = -1)
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(loop
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(r3 = -1)
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(read r3 r4)
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(r1 = (r4 <8 r3))
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,@utf-16-decode-ucs
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(if (r0 >= 0)
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((translate-character utf-translation-table-for-decode r0 r1)
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(write-multibyte-character r0 r1)))
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(repeat))))
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(defconst utf-16be-decode-loop
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`((r5 = -1)
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(loop
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(r3 = -1)
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(read r3 r4)
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(r1 = (r3 <8 r4))
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,@utf-16-decode-ucs
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(if (r0 >= 0)
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((translate-character utf-translation-table-for-decode r0 r1)
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(write-multibyte-character r0 r1)))
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(repeat))))
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)
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(define-ccl-program ccl-decode-mule-utf-16le
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`(2 ; 2 bytes -> 1 to 4 bytes
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,utf-16le-decode-loop
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((if (r5 >= 0)
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((r0 = r5)
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(call ccl-mule-utf-untrans)))
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(if (r3 < 0)
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nil
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((if (r3 < #xA0)
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(r0 = ,(charset-id 'eight-bit-control))
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(r0 = ,(charset-id 'eight-bit-graphic)))
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(write-multibyte-character r0 r3)))))
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"Decode UTF-16LE (little endian without signature bytes).
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Basic decoding is done into the charsets ascii, latin-iso8859-1 and
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mule-unicode-*. Un-representable Unicode characters are decoded as
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U+fffd. The result is run through the translation-table named
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`utf-translation-table-for-decode'.")
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(define-ccl-program ccl-decode-mule-utf-16be
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`(2 ; 2 bytes -> 1 to 4 bytes
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,utf-16be-decode-loop
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((if (r5 >= 0)
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((r0 = r5)
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(call ccl-mule-utf-untrans)))
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(if (r3 >= 0)
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((r0 = r3)
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(call ccl-mule-utf-untrans)))))
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"Decode UTF-16BE (big endian without signature bytes).
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Basic decoding is done into the charsets ascii, latin-iso8859-1 and
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mule-unicode-*. Un-representable Unicode characters are
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decoded as U+fffd. The result is run through the translation-table of
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name `utf-translation-table-for-decode'.")
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(define-ccl-program ccl-decode-mule-utf-16le-with-signature
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`(2
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((r3 = -1)
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(read r3 r4)
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,@utf-16le-decode-loop)
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(if (r3 >= 0)
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((r0 = r3)
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(call ccl-mule-utf-untrans))))
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"Like ccl-decode-utf-16le but skip the first 2-byte BOM.")
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(define-ccl-program ccl-decode-mule-utf-16be-with-signature
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`(2
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((r3 = -1)
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(read r3 r4)
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,@utf-16be-decode-loop)
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(if (r3 >= 0)
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((r0 = r3)
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(call ccl-mule-utf-untrans))))
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"Like ccl-decode-utf-16be but skip the first 2-byte BOM.")
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(define-ccl-program ccl-decode-mule-utf-16
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`(2
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((r3 = -1)
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(read r3 r4)
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(r1 = (r3 <8 r4))
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(r5 = -1)
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(if (r1 == #xFFFE)
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;; R1 is a BOM for little endian. We keep this character as
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;; is temporarily. It is removed by post-read-conversion
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;; function.
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(,@utf-16-decode-ucs
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(write-multibyte-character r0 r1)
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,@utf-16le-decode-loop)
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((if (r1 == #xFEFF)
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;; R1 is a BOM for big endian, but we can't keep that
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;; character in the output because it can't be
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;; distinguished with the normal U+FEFF. So, we keep
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;; #xFFFF instead.
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((r1 = #xFFFF)
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,@utf-16-decode-ucs
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(write-multibyte-character r0 r1))
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;; R1 is a normal Unicode character.
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(,@utf-16-decode-ucs
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(if (r0 >= 0)
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((translate-character utf-translation-table-for-decode r0 r1)
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(write-multibyte-character r0 r1)))))
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,@utf-16be-decode-loop)))
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(if (r3 >= 0)
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((r0 = r3)
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(call ccl-mule-utf-untrans))))
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"Like ccl-decode-utf-16be/le but check the first BOM.")
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(makunbound 'utf-16-decode-ucs) ; done with it
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(makunbound 'utf-16le-decode-loop)
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(makunbound 'utf-16be-decode-loop)
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;; UTF-16 decoder generates an UTF-8 sequence represented by a
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;; sequence eight-bit-control/graphic chars for an invalid byte (the
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;; last byte of an odd length source) and an untranslatable character
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;; (including an invalid surrogate-pair code-point).
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;;
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;; This CCL parses that sequence (the first byte is already in r1),
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;; and if the sequence represents an untranslatable character, it sets
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;; r1 to the original invalid code or untranslated Unicode character
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;; code, sets r2 to -1 (to prevent r2 and r3 are written), set2 r5 to
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;; -1 (to tell the caller that there's no pre-read character).
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;;
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;; If the sequence represents an invalid byte, it sets r1 to -1, r2 to
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;; the byte, sets r3 and r5 to -1.
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;;
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;; Otherwise, don't change r1, set r2 and r3 to already read
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;; eight-bit-control/graphic characters (if any), set r5 and r6 to the
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;; last character that invalidates the UTF-8 form.
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;;
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;; Note: For UTF-8 validation, we only check if a character is
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;; eight-bit-control/graphic or not. It may result in incorrect
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;; handling of random binary data, but such a data can't be encoded by
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;; UTF-16 anyway. At least, UTF-16 decoder doesn't generate such a
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;; sequence even if a source contains invalid byte-sequence.
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(define-ccl-program ccl-mule-utf-16-encode-untrans
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`(0
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((r2 = -1)
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;; Read the 2nd byte.
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(read-multibyte-character r5 r6)
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(r0 = (r5 != ,(charset-id 'eight-bit-control)))
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(if ((r5 != ,(charset-id 'eight-bit-graphic)) & r0)
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((r2 = r1)
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(r3 = -1)
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(r1 = -1)
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(end))) ; invalid UTF-8
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(r3 = -1)
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(r2 = r6)
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(if (r1 <= #xE0)
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;; 2-byte UTF-8, i.e. originally an invalid byte.
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((r2 &= #x3F)
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(r2 |= ((r1 & #x1F) << 6))
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(r1 = -1)
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(r5 = -1)
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(end)))
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;; Read the 3rd byte.
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(read-multibyte-character r5 r6)
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(r0 = (r5 != ,(charset-id 'eight-bit-control)))
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(if ((r5 != ,(charset-id 'eight-bit-graphic)) & r0)
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((end))) ; invalid UTF-8
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(if (r1 < #xF0) ; valid 3-byte UTF-8
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((r1 = ((r1 & #x0F) << 12))
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(r1 |= ((r2 & #x3F) << 6))
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(r1 |= (r6 & #x3F))
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(r2 = -1)
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(r5 = -1)
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(end)))
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(r3 = r6)
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;; Read the 4th byte.
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(read-multibyte-character r5 r6)
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(r0 = (r5 != ,(charset-id 'eight-bit-control)))
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(if ((r5 != ,(charset-id 'eight-bit-graphic)) & r0)
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(end)) ; livalid UTF-8
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;; valid 4-byte UTF-8
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(r1 = ((r1 & #x07) << 18))
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(r1 |= ((r2 & #x3F) << 12))
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(r1 |= ((r3 & #x3F) << 6))
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(r1 |= (r6 & #x3F))
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(r2 = -1)
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(r5 = -1)
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(end))
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(if (r1 >= 0)
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((write r1)
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(if (r2 >= 0)
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((write r2)
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(if (r3 >= 0)
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(write r3))))))))
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(eval-and-compile
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(defconst utf-16-decode-to-ucs
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;; Read a character and set r1 to the corresponding Unicode code.
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;; If r5 is not negative, it means that we have already read a
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;; character into r5 and r6.
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;; If an invalid eight-bit-control/graphic sequence is found, r2 and
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;; r3 may contain a byte to written out, r5 and r6 may contain a
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;; pre-read character. Usually they are set to -1.
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`((if (r5 < 0)
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(read-multibyte-character r0 r1)
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((r0 = r5)
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(r1 = r6)
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(r5 = -1)))
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(lookup-character utf-subst-table-for-encode r0 r1)
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(r2 = -1)
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(if (r7 > 0)
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(r1 = r0)
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((translate-character utf-translation-table-for-encode r0 r1)
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(if (r0 == ,(charset-id 'ascii))
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nil
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(if (r0 == ,(charset-id 'latin-iso8859-1))
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(r1 += 128)
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(if (r0 == ,(charset-id 'eight-bit-control))
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nil
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(if (r0 == ,(charset-id 'eight-bit-graphic))
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(call ccl-mule-utf-16-encode-untrans)
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((r2 = ((r1 & #x7f) - 32))
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(r3 = ((((r1 >> 7) - 32) * 96) + r2))
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(r2 = -1)
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(r5 = -1)
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(if (r0 == ,(charset-id 'mule-unicode-0100-24ff))
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(r1 = (r3 + #x100))
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(if (r0 == ,(charset-id 'mule-unicode-2500-33ff))
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(r1 = (r3 + #x2500))
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(if (r0 == ,(charset-id 'mule-unicode-e000-ffff))
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(r1 = (r3 + #xe000))
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(r1 = #xfffd)))))))))))))
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(defconst utf-16le-encode-loop
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`((r5 = -1)
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(loop
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,@utf-16-decode-to-ucs
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(if (r1 >= #x10000)
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((r1 -= #x10000)
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(r0 = ((r1 >> 10) + #xD800))
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(write (r0 & 255))
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(write (r0 >> 8))
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(r1 = ((r1 & #x3FF) + #xDC00))))
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(if (r1 >= 0)
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((write (r1 & 255))
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(write (r1 >> 8))))
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(if (r2 >= 0)
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((write r2)
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(if (r3 >= 0)
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(write r3))))
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(repeat))))
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(defconst utf-16be-encode-loop
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`((r5 = -1)
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(loop
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,@utf-16-decode-to-ucs
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(if (r1 >= #x10000)
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((r1 -= #x10000)
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(r0 = ((r1 >> 10) + #xD800))
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(write (r0 >> 8))
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(write (r0 & 255))
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(r1 = ((r1 & #x3FF) + #xDC00))))
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(if (r1 >= 0)
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((write (r1 >> 8))
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(write (r1 & 255))))
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(if (r2 >= 0)
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((write r2)
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(if (r3 >= 0)
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(write r3))))
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(repeat))))
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)
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(define-ccl-program ccl-encode-mule-utf-16le
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`(2
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,utf-16le-encode-loop)
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"Encode to UTF-16LE (little endian without signature).
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Characters from the charsets ascii, eight-bit-control,
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eight-bit-graphic, latin-iso8859-1 and mule-unicode-* are encoded
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after translation through the translation-table of name
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`utf-translation-table-for-encode'.
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Others are encoded as U+FFFD.")
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(define-ccl-program ccl-encode-mule-utf-16be
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`(2
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,utf-16be-encode-loop)
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"Encode to UTF-16BE (big endian without signature).
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Characters from the charsets ascii, eight-bit-control,
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eight-bit-graphic, latin-iso8859-1 and mule-unicode-* are encoded
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after translation through the translation-table named
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`utf-translation-table-for-encode'.
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Others are encoded as U+FFFD.")
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(define-ccl-program ccl-encode-mule-utf-16le-with-signature
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`(2
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((write #xFF)
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(write #xFE)
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,@utf-16le-encode-loop))
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"Encode to UTF-16 (little endian with signature).
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Characters from the charsets ascii, eight-bit-control,
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eight-bit-graphic, latin-iso8859-1 and mule-unicode-* are encoded
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after translation through the translation-table of name
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`utf-translation-table-for-encode'.
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Others are encoded as U+FFFD.")
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(define-ccl-program ccl-encode-mule-utf-16be-with-signature
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`(2
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((write #xFE)
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(write #xFF)
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,@utf-16be-encode-loop))
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"Encode to UTF-16 (big endian with signature).
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Characters from the charsets ascii, eight-bit-control,
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eight-bit-graphic, latin-iso8859-1 and mule-unicode-* are encoded
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after translation through the translation-table named
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`utf-translation-table-for-encode'.
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Others are encoded as U+FFFD.")
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(makunbound 'utf-16-decode-to-ucs)
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(makunbound 'utf-16le-encode-loop)
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(makunbound 'utf-16be-encode-loop)
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(defun mule-utf-16-post-read-conversion (length)
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(when (> length 0)
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(setq length (utf-8-post-read-conversion length))
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(let ((char (following-char)))
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(cond ((= char (decode-char 'ucs #xFFFE))
|
|
(delete-char 1)
|
|
(setq last-coding-system-used
|
|
(coding-system-change-text-conversion
|
|
last-coding-system-used
|
|
'mule-utf-16le-with-signature))
|
|
(setq length (1- length)))
|
|
((= char (decode-char 'ucs #xFFFF))
|
|
(delete-char 1)
|
|
(setq last-coding-system-used
|
|
(coding-system-change-text-conversion
|
|
last-coding-system-used
|
|
'mule-utf-16be-with-signature))
|
|
(setq length (1- length)))
|
|
(t
|
|
(setq last-coding-system-used 'mule-utf-16be)))))
|
|
length)
|
|
|
|
(let ((doc "
|
|
|
|
It supports Unicode characters of these ranges:
|
|
U+0000..U+33FF, U+E000..U+FFFF.
|
|
They correspond to these Emacs character sets:
|
|
ascii, latin-iso8859-1, mule-unicode-0100-24ff,
|
|
mule-unicode-2500-33ff, mule-unicode-e000-ffff
|
|
|
|
On decoding (e.g. reading a file), Unicode characters not in the above
|
|
ranges are decoded as U+FFFD, effectively corrupting the data
|
|
if they are re-encoded.
|
|
|
|
On encoding (e.g. writing a file), Emacs characters not belonging to
|
|
any of the character sets listed above are encoded into the byte
|
|
sequence representing U+FFFD (REPLACEMENT CHARACTER).")
|
|
(props `((safe-charsets
|
|
ascii
|
|
eight-bit-control
|
|
eight-bit-graphic
|
|
latin-iso8859-1
|
|
mule-unicode-0100-24ff
|
|
mule-unicode-2500-33ff
|
|
mule-unicode-e000-ffff
|
|
,@(if utf-translate-cjk-mode
|
|
utf-translate-cjk-charsets))
|
|
(valid-codes (0 . 255))
|
|
(mime-text-unsuitable . t)
|
|
(pre-write-conversion . utf-8-pre-write-conversion)
|
|
(dependency unify-8859-on-encoding-mode
|
|
unify-8859-on-decoding-mode
|
|
utf-fragment-on-decoding
|
|
utf-translate-cjk-mode))))
|
|
(make-coding-system
|
|
'mule-utf-16le 4
|
|
?u ; Mule-UCS uses ?U, but code-pages uses that for koi8-u.
|
|
(concat
|
|
"UTF-16LE encoding for Emacs-supported Unicode characters."
|
|
doc)
|
|
'(ccl-decode-mule-utf-16le . ccl-encode-mule-utf-16le)
|
|
`(,@props
|
|
(post-read-conversion . utf-8-post-read-conversion)
|
|
(ascii-incompatible . t)
|
|
(mime-charset . utf-16le)))
|
|
|
|
(make-coding-system
|
|
'mule-utf-16be 4 ?u
|
|
(concat
|
|
"UTF-16BE encoding for Emacs-supported Unicode characters."
|
|
doc)
|
|
|
|
'(ccl-decode-mule-utf-16be . ccl-encode-mule-utf-16be)
|
|
`(,@props
|
|
(post-read-conversion . utf-8-post-read-conversion)
|
|
(ascii-incompatible . t)
|
|
(mime-charset . utf-16be)))
|
|
|
|
(make-coding-system
|
|
'mule-utf-16le-with-signature 4 ?u
|
|
(concat
|
|
"Little endian UTF-16 (with BOM) for Emacs-supported Unicode characters."
|
|
doc)
|
|
|
|
'(ccl-decode-mule-utf-16le-with-signature
|
|
. ccl-encode-mule-utf-16le-with-signature)
|
|
`(,@props
|
|
(post-read-conversion . utf-8-post-read-conversion)
|
|
(coding-category . coding-category-utf-16-le)
|
|
(ascii-incompatible . t)
|
|
(mime-charset . utf-16)))
|
|
|
|
(make-coding-system
|
|
'mule-utf-16be-with-signature 4 ?u
|
|
(concat
|
|
"Big endian UTF-16 (with BOM) for Emacs-supported Unicode characters."
|
|
doc)
|
|
|
|
'(ccl-decode-mule-utf-16be-with-signature
|
|
. ccl-encode-mule-utf-16be-with-signature)
|
|
`(,@props
|
|
(post-read-conversion . utf-8-post-read-conversion)
|
|
(coding-category . coding-category-utf-16-be)
|
|
(ascii-incompatible . t)
|
|
(mime-charset . utf-16)))
|
|
|
|
(make-coding-system
|
|
'mule-utf-16 4 ?u
|
|
(concat
|
|
"UTF-16 (with or without BOM) for Emacs-supported Unicode characters."
|
|
doc)
|
|
|
|
'(ccl-decode-mule-utf-16 . ccl-encode-mule-utf-16be-with-signature)
|
|
`(,@props
|
|
(post-read-conversion . mule-utf-16-post-read-conversion)
|
|
(coding-category . coding-category-utf-16-be)
|
|
(ascii-incompatible . t)
|
|
(mime-charset . utf-16)))
|
|
)
|
|
|
|
(define-coding-system-alias 'utf-16le 'mule-utf-16le)
|
|
(define-coding-system-alias 'utf-16be 'mule-utf-16be)
|
|
(define-coding-system-alias 'utf-16le-with-signature
|
|
'mule-utf-16le-with-signature)
|
|
(define-coding-system-alias 'utf-16be-with-signature
|
|
'mule-utf-16be-with-signature)
|
|
(define-coding-system-alias 'utf-16 'mule-utf-16)
|
|
|
|
;; For backward compatibility.
|
|
(define-coding-system-alias 'mule-utf-16-le 'mule-utf-16le-with-signature)
|
|
(define-coding-system-alias 'utf-16-le 'mule-utf-16le-with-signature)
|
|
(define-coding-system-alias 'mule-utf-16-be 'mule-utf-16be-with-signature)
|
|
(define-coding-system-alias 'utf-16-be 'mule-utf-16be-with-signature)
|
|
|
|
;;; arch-tag: 85455d46-d9c9-466d-a6f3-c3582a7367c4
|
|
;;; utf-16.el ends here
|