mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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702 lines
21 KiB
C++
702 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Peter Annema <jaggernaut@netscape.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsUTF8Utils_h_
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#define nsUTF8Utils_h_
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// This file may be used in two ways: if MOZILLA_INTERNAL_API is defined, this
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// file will provide signatures for the Mozilla abstract string types. It will
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// use XPCOM assertion/debugging macros, etc.
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#include "nscore.h"
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#include "nsCharTraits.h"
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class UTF8traits
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{
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public:
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static PRBool isASCII(char c) { return (c & 0x80) == 0x00; }
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static PRBool isInSeq(char c) { return (c & 0xC0) == 0x80; }
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static PRBool is2byte(char c) { return (c & 0xE0) == 0xC0; }
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static PRBool is3byte(char c) { return (c & 0xF0) == 0xE0; }
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static PRBool is4byte(char c) { return (c & 0xF8) == 0xF0; }
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static PRBool is5byte(char c) { return (c & 0xFC) == 0xF8; }
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static PRBool is6byte(char c) { return (c & 0xFE) == 0xFC; }
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};
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/**
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* Extract the next UCS-4 character from the buffer and return it. The
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* pointer passed in is advanced to the start of the next character in the
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* buffer. If non-null, the parameters err and overlong are filled in to
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* indicate that the character was represented by an overlong sequence, or
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* that an error occurred.
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*/
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class UTF8CharEnumerator
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{
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public:
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static PRUint32 NextChar(const char **buffer, const char *end,
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PRBool *err)
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{
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NS_ASSERTION(buffer && *buffer, "null buffer!");
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const char *p = *buffer;
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*err = PR_FALSE;
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if (p >= end)
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{
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*err = PR_TRUE;
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return 0;
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}
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char c = *p++;
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if ( UTF8traits::isASCII(c) )
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{
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*buffer = p;
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return c;
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}
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PRUint32 ucs4;
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PRUint32 minUcs4;
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PRInt32 state = 0;
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if (!CalcState(c, ucs4, minUcs4, state)) {
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NS_ERROR("Not a UTF-8 string. This code should only be used for converting from known UTF-8 strings.");
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*err = PR_TRUE;
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return 0;
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}
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while ( state-- )
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{
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if (p == end)
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{
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*err = PR_TRUE;
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return 0;
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}
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c = *p++;
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if (!AddByte(c, state, ucs4))
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{
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*err = PR_TRUE;
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return 0;
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}
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}
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if ( ucs4 < minUcs4 )
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{
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// Overlong sequence
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ucs4 = UCS2_REPLACEMENT_CHAR;
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}
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else if ( ucs4 >= 0xD800 &&
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(ucs4 <= 0xDFFF || ucs4 >= UCS_END))
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{
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// Surrogates and code points outside the Unicode range.
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ucs4 = UCS2_REPLACEMENT_CHAR;
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}
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*buffer = p;
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return ucs4;
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}
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private:
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static PRBool CalcState(char c, PRUint32& ucs4, PRUint32& minUcs4,
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PRInt32& state)
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{
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if ( UTF8traits::is2byte(c) )
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{
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ucs4 = (PRUint32(c) << 6) & 0x000007C0L;
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state = 1;
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minUcs4 = 0x00000080;
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}
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else if ( UTF8traits::is3byte(c) )
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{
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ucs4 = (PRUint32(c) << 12) & 0x0000F000L;
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state = 2;
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minUcs4 = 0x00000800;
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}
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else if ( UTF8traits::is4byte(c) )
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{
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ucs4 = (PRUint32(c) << 18) & 0x001F0000L;
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state = 3;
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minUcs4 = 0x00010000;
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}
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else if ( UTF8traits::is5byte(c) )
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{
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ucs4 = (PRUint32(c) << 24) & 0x03000000L;
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state = 4;
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minUcs4 = 0x00200000;
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}
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else if ( UTF8traits::is6byte(c) )
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{
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ucs4 = (PRUint32(c) << 30) & 0x40000000L;
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state = 5;
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minUcs4 = 0x04000000;
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}
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else
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{
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return PR_FALSE;
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}
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return PR_TRUE;
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}
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static PRBool AddByte(char c, PRInt32 state, PRUint32& ucs4)
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{
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if ( UTF8traits::isInSeq(c) )
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{
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PRInt32 shift = state * 6;
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ucs4 |= (PRUint32(c) & 0x3F) << shift;
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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};
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/**
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* Extract the next UCS-4 character from the buffer and return it. The
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* pointer passed in is advanced to the start of the next character in the
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* buffer. If non-null, the err parameter is filled in if an error occurs.
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*/
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class UTF16CharEnumerator
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{
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public:
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static PRUint32 NextChar(const PRUnichar **buffer, const PRUnichar *end,
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PRBool *err = nsnull)
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{
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NS_ASSERTION(buffer && *buffer, "null buffer!");
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const PRUnichar *p = *buffer;
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if (p >= end)
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{
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NS_ERROR("No input to work with");
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if (err)
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*err = PR_TRUE;
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return 0;
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}
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PRUnichar c = *p++;
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if (!IS_SURROGATE(c)) // U+0000 - U+D7FF,U+E000 - U+FFFF
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{
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if (err)
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*err = PR_FALSE;
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*buffer = p;
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return c;
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}
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else if (NS_IS_HIGH_SURROGATE(c)) // U+D800 - U+DBFF
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{
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if (p == end)
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{
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// Found a high surrogate the end of the buffer. Flag this
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// as an error and return the Unicode replacement
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// character 0xFFFD.
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NS_WARNING("Unexpected end of buffer after high surrogate");
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if (err)
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*err = PR_TRUE;
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*buffer = p;
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return 0xFFFD;
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}
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// D800- DBFF - High Surrogate
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PRUnichar h = c;
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c = *p++;
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if (NS_IS_LOW_SURROGATE(c))
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{
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// DC00- DFFF - Low Surrogate
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// N = (H - D800) *400 + 10000 + (L - DC00)
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PRUint32 ucs4 = SURROGATE_TO_UCS4(h, c);
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if (err)
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*err = PR_FALSE;
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*buffer = p;
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return ucs4;
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}
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else
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{
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// Found a high surrogate followed by something other than
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// a low surrogate. Flag this as an error and return the
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// Unicode replacement character 0xFFFD. Note that the
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// pointer to the next character points to the second 16-bit
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// value, not beyond it, as per Unicode 5.0.0 Chapter 3 C10,
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// only the first code unit of an illegal sequence must be
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// treated as an illegally terminated code unit sequence
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// (also Chapter 3 D91, "isolated [not paired and ill-formed]
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// UTF-16 code units in the range D800..DFFF are ill-formed").
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NS_WARNING("got a High Surrogate but no low surrogate");
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if (err)
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*err = PR_TRUE;
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*buffer = p - 1;
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return 0xFFFD;
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}
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}
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else // U+DC00 - U+DFFF
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{
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// DC00- DFFF - Low Surrogate
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// Found a low surrogate w/o a preceding high surrogate. Flag
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// this as an error and return the Unicode replacement
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// character 0xFFFD.
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NS_WARNING("got a low Surrogate but no high surrogate");
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if (err)
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*err = PR_TRUE;
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*buffer = p;
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return 0xFFFD;
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}
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if (err)
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*err = PR_TRUE;
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return 0;
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}
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};
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/**
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* A character sink (see |copy_string| in nsAlgorithm.h) for converting
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* UTF-8 to UTF-16
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*/
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class ConvertUTF8toUTF16
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{
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public:
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typedef char value_type;
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typedef PRUnichar buffer_type;
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ConvertUTF8toUTF16( buffer_type* aBuffer )
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: mStart(aBuffer), mBuffer(aBuffer), mErrorEncountered(PR_FALSE) {}
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size_t Length() const { return mBuffer - mStart; }
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PRBool ErrorEncountered() const { return mErrorEncountered; }
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void NS_ALWAYS_INLINE write( const value_type* start, PRUint32 N )
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{
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if ( mErrorEncountered )
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return;
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// algorithm assumes utf8 units won't
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// be spread across fragments
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const value_type* p = start;
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const value_type* end = start + N;
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buffer_type* out = mBuffer;
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for ( ; p != end /* && *p */; )
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{
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PRBool err;
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PRUint32 ucs4 = UTF8CharEnumerator::NextChar(&p, end, &err);
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if ( err )
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{
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mErrorEncountered = PR_TRUE;
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mBuffer = out;
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return;
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}
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if ( ucs4 >= PLANE1_BASE )
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{
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*out++ = (buffer_type)H_SURROGATE(ucs4);
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*out++ = (buffer_type)L_SURROGATE(ucs4);
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}
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else
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{
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*out++ = ucs4;
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}
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}
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mBuffer = out;
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}
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void write_terminator()
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{
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*mBuffer = buffer_type(0);
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}
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private:
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buffer_type* const mStart;
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buffer_type* mBuffer;
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PRBool mErrorEncountered;
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};
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/**
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* A character sink (see |copy_string| in nsAlgorithm.h) for computing
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* the length of the UTF-16 string equivalent to a UTF-8 string.
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*/
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class CalculateUTF8Length
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{
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public:
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typedef char value_type;
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CalculateUTF8Length() : mLength(0), mErrorEncountered(PR_FALSE) { }
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size_t Length() const { return mLength; }
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void NS_ALWAYS_INLINE write( const value_type* start, PRUint32 N )
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{
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// ignore any further requests
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if ( mErrorEncountered )
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return;
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// algorithm assumes utf8 units won't
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// be spread across fragments
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const value_type* p = start;
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const value_type* end = start + N;
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for ( ; p < end /* && *p */; ++mLength )
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{
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if ( UTF8traits::isASCII(*p) )
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p += 1;
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else if ( UTF8traits::is2byte(*p) )
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p += 2;
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else if ( UTF8traits::is3byte(*p) )
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p += 3;
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else if ( UTF8traits::is4byte(*p) ) {
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// Because a UTF-8 sequence of 4 bytes represents a codepoint
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// greater than 0xFFFF, it will become a surrogate pair in the
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// UTF-16 string, so add 1 more to mLength.
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// This doesn't happen with is5byte and is6byte because they
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// are illegal UTF-8 sequences (greater than 0x10FFFF) so get
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// converted to a single replacement character.
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// However, there is one case when a 4 byte UTF-8 sequence will
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// only generate 2 UTF-16 bytes. If we have a properly encoded
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// sequence, but with an invalid value (too small or too big),
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// that will result in a replacement character being written
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// This replacement character is encoded as just 1 single
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// UTF-16 character, which is 2 bytes.
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// The below code therefore only adds 1 to mLength if the UTF8
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// data will produce a decoded character which is greater than
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// or equal to 0x010000 and less than 0x0110000.
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// A 4byte UTF8 character is encoded as
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// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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// Bit 1-3 on the first byte, and bit 5-6 on the second byte,
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// map to bit 17-21 in the final result. If these bits are
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// between 0x01 and 0x11, that means that the final result is
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// between 0x010000 and 0x110000. The below code reads these
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// bits out and assigns them to c, but shifted up 4 bits to
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// avoid having to shift twice.
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// It doesn't matter what to do in the case where p + 4 > end
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// since no UTF16 characters will be written in that case by
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// ConvertUTF8toUTF16. Likewise it doesn't matter what we do if
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// any of the surrogate bits are wrong since no UTF16
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// characters will be written in that case either.
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if (p + 4 <= end) {
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PRUint32 c = ((PRUint32)(p[0] & 0x07)) << 6 |
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((PRUint32)(p[1] & 0x30));
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if (c >= 0x010 && c < 0x110)
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++mLength;
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}
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p += 4;
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}
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else if ( UTF8traits::is5byte(*p) )
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p += 5;
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else if ( UTF8traits::is6byte(*p) )
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p += 6;
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else
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{
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break;
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}
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}
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if ( p != end )
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{
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NS_ERROR("Not a UTF-8 string. This code should only be used for converting from known UTF-8 strings.");
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mErrorEncountered = PR_TRUE;
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}
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}
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private:
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size_t mLength;
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PRBool mErrorEncountered;
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};
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/**
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* A character sink (see |copy_string| in nsAlgorithm.h) for
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* converting UTF-16 to UTF-8. Treats invalid UTF-16 data as 0xFFFD
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* (0xEFBFBD in UTF-8).
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*/
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class ConvertUTF16toUTF8
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{
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public:
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typedef PRUnichar value_type;
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typedef char buffer_type;
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// The error handling here is more lenient than that in
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// |ConvertUTF8toUTF16|, but it's that way for backwards
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// compatibility.
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ConvertUTF16toUTF8( buffer_type* aBuffer )
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: mStart(aBuffer), mBuffer(aBuffer) {}
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size_t Size() const { return mBuffer - mStart; }
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void NS_ALWAYS_INLINE write( const value_type* start, PRUint32 N )
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{
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buffer_type *out = mBuffer; // gcc isn't smart enough to do this!
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for (const value_type *p = start, *end = start + N; p < end; ++p )
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{
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value_type c = *p;
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if (! (c & 0xFF80)) // U+0000 - U+007F
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{
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*out++ = (char)c;
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}
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else if (! (c & 0xF800)) // U+0100 - U+07FF
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{
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*out++ = 0xC0 | (char)(c >> 6);
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*out++ = 0x80 | (char)(0x003F & c);
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}
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else if (!IS_SURROGATE(c)) // U+0800 - U+D7FF,U+E000 - U+FFFF
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{
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*out++ = 0xE0 | (char)(c >> 12);
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*out++ = 0x80 | (char)(0x003F & (c >> 6));
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*out++ = 0x80 | (char)(0x003F & c );
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}
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else if (NS_IS_HIGH_SURROGATE(c)) // U+D800 - U+DBFF
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{
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// D800- DBFF - High Surrogate
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value_type h = c;
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++p;
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if (p == end)
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{
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// Treat broken characters as the Unicode
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// replacement character 0xFFFD (0xEFBFBD in
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// UTF-8)
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*out++ = '\xEF';
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*out++ = '\xBF';
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*out++ = '\xBD';
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NS_WARNING("String ending in half a surrogate pair!");
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break;
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}
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c = *p;
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if (NS_IS_LOW_SURROGATE(c))
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{
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// DC00- DFFF - Low Surrogate
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// N = (H - D800) *400 + 10000 + ( L - DC00 )
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PRUint32 ucs4 = SURROGATE_TO_UCS4(h, c);
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// 0001 0000-001F FFFF
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*out++ = 0xF0 | (char)(ucs4 >> 18);
|
|
*out++ = 0x80 | (char)(0x003F & (ucs4 >> 12));
|
|
*out++ = 0x80 | (char)(0x003F & (ucs4 >> 6));
|
|
*out++ = 0x80 | (char)(0x003F & ucs4);
|
|
}
|
|
else
|
|
{
|
|
// Treat broken characters as the Unicode
|
|
// replacement character 0xFFFD (0xEFBFBD in
|
|
// UTF-8)
|
|
*out++ = '\xEF';
|
|
*out++ = '\xBF';
|
|
*out++ = '\xBD';
|
|
|
|
// The pointer to the next character points to the second
|
|
// 16-bit value, not beyond it, as per Unicode 5.0.0
|
|
// Chapter 3 C10, only the first code unit of an illegal
|
|
// sequence must be treated as an illegally terminated
|
|
// code unit sequence (also Chapter 3 D91, "isolated [not
|
|
// paired and ill-formed] UTF-16 code units in the range
|
|
// D800..DFFF are ill-formed").
|
|
p--;
|
|
|
|
NS_WARNING("got a High Surrogate but no low surrogate");
|
|
}
|
|
}
|
|
else // U+DC00 - U+DFFF
|
|
{
|
|
// Treat broken characters as the Unicode replacement
|
|
// character 0xFFFD (0xEFBFBD in UTF-8)
|
|
*out++ = '\xEF';
|
|
*out++ = '\xBF';
|
|
*out++ = '\xBD';
|
|
|
|
// DC00- DFFF - Low Surrogate
|
|
NS_WARNING("got a low Surrogate but no high surrogate");
|
|
}
|
|
}
|
|
|
|
mBuffer = out;
|
|
}
|
|
|
|
void write_terminator()
|
|
{
|
|
*mBuffer = buffer_type(0);
|
|
}
|
|
|
|
private:
|
|
buffer_type* const mStart;
|
|
buffer_type* mBuffer;
|
|
};
|
|
|
|
/**
|
|
* A character sink (see |copy_string| in nsAlgorithm.h) for computing
|
|
* the number of bytes a UTF-16 would occupy in UTF-8. Treats invalid
|
|
* UTF-16 data as 0xFFFD (0xEFBFBD in UTF-8).
|
|
*/
|
|
class CalculateUTF8Size
|
|
{
|
|
public:
|
|
typedef PRUnichar value_type;
|
|
|
|
CalculateUTF8Size()
|
|
: mSize(0) { }
|
|
|
|
size_t Size() const { return mSize; }
|
|
|
|
void NS_ALWAYS_INLINE write( const value_type* start, PRUint32 N )
|
|
{
|
|
// Assume UCS2 surrogate pairs won't be spread across fragments.
|
|
for (const value_type *p = start, *end = start + N; p < end; ++p )
|
|
{
|
|
value_type c = *p;
|
|
if (! (c & 0xFF80)) // U+0000 - U+007F
|
|
mSize += 1;
|
|
else if (! (c & 0xF800)) // U+0100 - U+07FF
|
|
mSize += 2;
|
|
else if (0xD800 != (0xF800 & c)) // U+0800 - U+D7FF,U+E000 - U+FFFF
|
|
mSize += 3;
|
|
else if (0xD800 == (0xFC00 & c)) // U+D800 - U+DBFF
|
|
{
|
|
++p;
|
|
if (p == end)
|
|
{
|
|
// Treat broken characters as the Unicode
|
|
// replacement character 0xFFFD (0xEFBFBD in
|
|
// UTF-8)
|
|
mSize += 3;
|
|
|
|
NS_WARNING("String ending in half a surrogate pair!");
|
|
|
|
break;
|
|
}
|
|
c = *p;
|
|
|
|
if (0xDC00 == (0xFC00 & c))
|
|
mSize += 4;
|
|
else
|
|
{
|
|
// Treat broken characters as the Unicode
|
|
// replacement character 0xFFFD (0xEFBFBD in
|
|
// UTF-8)
|
|
mSize += 3;
|
|
|
|
// The next code unit is the second 16-bit value, not
|
|
// the one beyond it, as per Unicode 5.0.0 Chapter 3 C10,
|
|
// only the first code unit of an illegal sequence must
|
|
// be treated as an illegally terminated code unit
|
|
// sequence (also Chapter 3 D91, "isolated [not paired and
|
|
// ill-formed] UTF-16 code units in the range D800..DFFF
|
|
// are ill-formed").
|
|
p--;
|
|
|
|
NS_WARNING("got a high Surrogate but no low surrogate");
|
|
}
|
|
}
|
|
else // U+DC00 - U+DFFF
|
|
{
|
|
// Treat broken characters as the Unicode replacement
|
|
// character 0xFFFD (0xEFBFBD in UTF-8)
|
|
mSize += 3;
|
|
|
|
NS_WARNING("got a low Surrogate but no high surrogate");
|
|
}
|
|
}
|
|
}
|
|
|
|
private:
|
|
size_t mSize;
|
|
};
|
|
|
|
#ifdef MOZILLA_INTERNAL_API
|
|
/**
|
|
* A character sink that performs a |reinterpret_cast| style conversion
|
|
* between character types.
|
|
*/
|
|
template <class FromCharT, class ToCharT>
|
|
class LossyConvertEncoding
|
|
{
|
|
public:
|
|
typedef FromCharT value_type;
|
|
|
|
typedef FromCharT input_type;
|
|
typedef ToCharT output_type;
|
|
|
|
typedef typename nsCharTraits<FromCharT>::unsigned_char_type unsigned_input_type;
|
|
|
|
public:
|
|
LossyConvertEncoding( output_type* aDestination ) : mDestination(aDestination) { }
|
|
|
|
void
|
|
write( const input_type* aSource, PRUint32 aSourceLength )
|
|
{
|
|
const input_type* done_writing = aSource + aSourceLength;
|
|
while ( aSource < done_writing )
|
|
*mDestination++ = (output_type)(unsigned_input_type)(*aSource++); // use old-style cast to mimic old |ns[C]String| behavior
|
|
}
|
|
|
|
void
|
|
write_terminator()
|
|
{
|
|
*mDestination = output_type(0);
|
|
}
|
|
|
|
private:
|
|
output_type* mDestination;
|
|
};
|
|
#endif // MOZILLA_INTERNAL_API
|
|
|
|
#endif /* !defined(nsUTF8Utils_h_) */
|