mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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185 lines
6.2 KiB
C++
185 lines
6.2 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 Communicator client 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) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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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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//----------------------------------------------------------------------
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// Global functions and data [declaration]
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#include "nsUCSupport.h"
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#include "nsUnicodeToUTF8.h"
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#include <string.h>
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NS_IMPL_ISUPPORTS1(nsUnicodeToUTF8, nsIUnicodeEncoder)
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//----------------------------------------------------------------------
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// nsUnicodeToUTF8 class [implementation]
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NS_IMETHODIMP nsUnicodeToUTF8::GetMaxLength(const PRUnichar * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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// aSrc is interpreted as UTF16, 3 is normally enough.
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// But when previous buffer only contains part of the surrogate pair, we
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// need to complete it here. If the first word in following buffer is not
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// in valid surrogate rang, we need to convert the remaining of last buffer
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// to 3 bytes.
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*aDestLength = 3*aSrcLength + 3;
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF8::FillInfo(PRUint32 *aInfo)
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{
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memset(aInfo, 0xFF, (0x10000L >> 3));
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF8::Convert(const PRUnichar * aSrc,
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PRInt32 * aSrcLength,
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char * aDest,
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PRInt32 * aDestLength)
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{
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const PRUnichar * src = aSrc;
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const PRUnichar * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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PRInt32 destLen = *aDestLength;
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PRUint32 n;
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//complete remaining of last conversion
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if (mHighSurrogate) {
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if (src < srcEnd) {
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*aDestLength = 0;
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return NS_OK_UENC_MOREINPUT;
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}
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if (*aDestLength < 4) {
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*aSrcLength = 0;
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*aDestLength = 0;
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return NS_OK_UENC_MOREOUTPUT;
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}
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if (*src < (PRUnichar)0xdc00 || *src > (PRUnichar)0xdfff) { //not a pair
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*dest++ = (char)0xe0 | (mHighSurrogate >> 12);
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*dest++ = (char)0x80 | ((mHighSurrogate >> 6) & 0x003f);
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*dest++ = (char)0x80 | (mHighSurrogate & 0x003f);
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destLen -= 3;
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} else {
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n = ((mHighSurrogate - (PRUnichar)0xd800) << 10) +
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(*src - (PRUnichar)0xdc00) + 0x10000;
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*dest++ = (char)0xf0 | (n >> 18);
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*dest++ = (char)0x80 | ((n >> 12) & 0x3f);
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*dest++ = (char)0x80 | ((n >> 6) & 0x3f);
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*dest++ = (char)0x80 | (n & 0x3f);
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++src;
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destLen -= 4;
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}
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mHighSurrogate = 0;
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}
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while (src < srcEnd) {
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if ( *src <= 0x007f) {
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if (destLen < 1)
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goto error_more_output;
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*dest++ = (char)*src;
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--destLen;
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} else if (*src <= 0x07ff) {
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if (destLen < 2)
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goto error_more_output;
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*dest++ = (char)0xc0 | (*src >> 6);
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*dest++ = (char)0x80 | (*src & 0x003f);
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destLen -= 2;
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} else if (*src >= (PRUnichar)0xD800 && *src < (PRUnichar)0xDC00) {
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if ((src+1) >= srcEnd) {
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//we need another surrogate to complete this unicode char
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mHighSurrogate = *src;
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*aDestLength = dest - aDest;
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return NS_OK_UENC_MOREINPUT;
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}
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//handle surrogate
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if (destLen < 4)
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goto error_more_output;
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if (*(src+1) < (PRUnichar)0xdc00 || *(src+1) > 0xdfff) { //not a pair
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*dest++ = (char)0xe0 | (*src >> 12);
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*dest++ = (char)0x80 | ((*src >> 6) & 0x003f);
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*dest++ = (char)0x80 | (*src & 0x003f);
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destLen -= 3;
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} else {
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n = ((*src - (PRUnichar)0xd800) << 10) + (*(src+1) - (PRUnichar)0xdc00) + (PRUint32)0x10000;
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*dest++ = (char)0xf0 | (n >> 18);
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*dest++ = (char)0x80 | ((n >> 12) & 0x3f);
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*dest++ = (char)0x80 | ((n >> 6) & 0x3f);
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*dest++ = (char)0x80 | (n & 0x3f);
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destLen -= 4;
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++src;
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}
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} else {
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if (destLen < 3)
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goto error_more_output;
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//treat rest of the character as BMP
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*dest++ = (char)0xe0 | (*src >> 12);
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*dest++ = (char)0x80 | ((*src >> 6) & 0x003f);
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*dest++ = (char)0x80 | (*src & 0x003f);
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destLen -= 3;
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}
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++src;
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}
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*aDestLength = dest - aDest;
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return NS_OK;
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error_more_output:
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*aSrcLength = src - aSrc;
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*aDestLength = dest - aDest;
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return NS_OK_UENC_MOREOUTPUT;
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}
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NS_IMETHODIMP nsUnicodeToUTF8::Finish(char * aDest, PRInt32 * aDestLength)
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{
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char * dest = aDest;
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if (mHighSurrogate) {
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if (*aDestLength < 3) {
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*aDestLength = 0;
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return NS_OK_UENC_MOREOUTPUT;
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}
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*dest++ = (char)0xe0 | (mHighSurrogate >> 12);
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*dest++ = (char)0x80 | ((mHighSurrogate >> 6) & 0x003f);
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*dest++ = (char)0x80 | (mHighSurrogate & 0x003f);
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mHighSurrogate = 0;
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*aDestLength = 3;
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return NS_OK;
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}
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*aDestLength = 0;
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return NS_OK;
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}
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