2001-09-26 04:47:52 +04:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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2004-04-18 18:21:17 +04:00
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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1999-06-10 00:33:07 +04:00
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*
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2004-04-18 18:21:17 +04:00
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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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1999-06-10 00:33:07 +04:00
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*
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2001-09-26 04:47:52 +04:00
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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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1999-06-10 00:33:07 +04:00
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*
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* The Original Code is Mozilla Communicator client code.
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*
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2004-04-18 18:21:17 +04:00
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* The Initial Developer of the Original Code is
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2001-09-26 04:47:52 +04:00
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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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1999-11-06 06:43:54 +03:00
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*
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2001-09-26 04:47:52 +04:00
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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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2004-04-18 18:21:17 +04:00
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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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2001-09-26 04:47:52 +04:00
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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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2004-04-18 18:21:17 +04:00
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* use your version of this file under the terms of the MPL, indicate your
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2001-09-26 04:47:52 +04:00
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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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2004-04-18 18:21:17 +04:00
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* the terms of any one of the MPL, the GPL or the LGPL.
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2001-09-26 04:47:52 +04:00
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*
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* ***** END LICENSE BLOCK ***** */
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1999-06-10 00:33:07 +04:00
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#include "nsUnicodeToUCS2BE.h"
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1999-09-07 00:44:26 +04:00
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#include <string.h>
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1999-06-10 00:33:07 +04:00
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2004-04-13 05:12:18 +04:00
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inline static void SwapBytes(char *aDest, const PRUnichar* aSrc, PRInt32 aLen);
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2001-01-24 01:33:22 +03:00
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NS_IMETHODIMP nsUnicodeToUTF16BE::Convert(const PRUnichar * aSrc, PRInt32 * aSrcLength,
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char * aDest, PRInt32 * aDestLength)
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{
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PRInt32 srcInLen = *aSrcLength;
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PRInt32 destInLen = *aDestLength;
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PRInt32 srcOutLen = 0;
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PRInt32 destOutLen = 0;
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PRInt32 copyCharLen;
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PRUnichar *p = (PRUnichar*)aDest;
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// Handle BOM if necessary
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if(0!=mBOM)
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{
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if(destInLen <2)
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goto needmoreoutput;
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*p++ = mBOM;
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mBOM = 0;
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destOutLen +=2;
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}
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// find out the length of copy
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copyCharLen = srcInLen;
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if(copyCharLen > (destInLen - destOutLen) / 2) {
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copyCharLen = (destInLen - destOutLen) / 2;
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}
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// copy the data by swaping
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CopyData((char*)p , aSrc, copyCharLen );
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srcOutLen += copyCharLen;
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destOutLen += copyCharLen * 2;
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if(copyCharLen < srcInLen)
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goto needmoreoutput;
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*aSrcLength = srcOutLen;
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*aDestLength = destOutLen;
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return NS_OK;
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needmoreoutput:
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*aSrcLength = srcOutLen;
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*aDestLength = destOutLen;
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return NS_OK_UENC_MOREOUTPUT;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::GetMaxLength(const PRUnichar * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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if(0 != mBOM)
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*aDestLength = 2*(aSrcLength+1);
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else
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*aDestLength = 2*aSrcLength;
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return NS_OK_UENC_EXACTLENGTH;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::Finish(char * aDest, PRInt32 * aDestLength)
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{
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if(0 != mBOM)
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{
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if(*aDestLength >= 2)
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{
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*((PRUnichar*)aDest)= mBOM;
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mBOM=0;
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*aDestLength = 2;
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return NS_OK;
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} else {
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*aDestLength = 0;
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return NS_OK; // xxx should be error
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}
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} else {
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*aDestLength = 0;
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return NS_OK;
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}
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::Reset()
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{
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mBOM = 0;
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::SetOutputErrorBehavior(PRInt32 aBehavior,
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nsIUnicharEncoder * aEncoder, PRUnichar aChar)
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{
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
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{
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2004-04-13 05:12:18 +04:00
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#ifdef IS_BIG_ENDIAN
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//UnicodeToUTF16SameEndian
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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#elif defined(IS_LITTLE_ENDIAN)
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//UnicodeToUTF16DiffEndian
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SwapBytes(aDest, aSrc, aLen);
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#else
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#error "Unknown endianness"
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#endif
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2001-01-24 01:33:22 +03:00
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF16LE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
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{
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2004-04-13 05:12:18 +04:00
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#ifdef IS_LITTLE_ENDIAN
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//UnicodeToUTF16SameEndian
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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#elif defined(IS_BIG_ENDIAN)
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//UnicodeToUTF16DiffEndian
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SwapBytes(aDest, aSrc, aLen);
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#else
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#error "Unknown endianness"
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#endif
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2001-01-24 01:33:22 +03:00
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return NS_OK;
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}
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2004-04-13 05:12:18 +04:00
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inline void SwapBytes(char *aDest, const PRUnichar* aSrc, PRInt32 aLen)
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{
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PRUnichar *p = (PRUnichar*) aDest;
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// copy the data by swaping
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for(PRInt32 i = 0; i < aLen; i++)
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{
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PRUnichar aChar = *aSrc++;
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*p++ = (0x00FF & (aChar >> 8)) | (0xFF00 & (aChar << 8));
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}
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}
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2001-01-24 01:33:22 +03:00
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