зеркало из https://github.com/mozilla/gecko-dev.git
387 строки
10 KiB
C++
387 строки
10 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
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape Communications Corporation.
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* Portions created by Netscape Communications Corporation are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* 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 LGPL or the GPL. 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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#include "nsUnicodeToUCS2BE.h"
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#include <string.h>
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//----------------------------------------------------------------------
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// Global functions and data [declaration]
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static const PRUint16 g_UCS2BEMappingTable[] = {
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0x0001, 0x0004, 0x0005, 0x0008, 0x0000, 0x0000, 0xFFFF, 0x0000
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};
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static const PRInt16 g_UCS2BEShiftTable[] = {
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0, u2BytesCharset,
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ShiftCell(0, 0, 0, 0, 0, 0, 0, 0)
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};
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//----------------------------------------------------------------------
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// Class nsUnicodeToUCS2BE [implementation]
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nsUnicodeToUCS2BE::nsUnicodeToUCS2BE()
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: nsTableEncoderSupport((uShiftTable*) &g_UCS2BEShiftTable,
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(uMappingTable*) &g_UCS2BEMappingTable)
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{
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}
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//----------------------------------------------------------------------
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// Subclassing of nsTableEncoderSupport class [implementation]
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NS_IMETHODIMP nsUnicodeToUCS2BE::GetMaxLength(const PRUnichar * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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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 nsUnicodeToUCS2BE::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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class nsUnicodeToUTF16SameEndian: public nsBasicEncoder
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{
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public:
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/**
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* Class constructor.
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*/
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nsUnicodeToUTF16SameEndian( PRUnichar aBOM )
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{
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mBOM = aBOM;
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};
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/**
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* Class destructor.
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*/
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virtual ~nsUnicodeToUTF16SameEndian() {};
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//--------------------------------------------------------------------
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// Interface nsIUnicodeEncoder [declaration]
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NS_IMETHOD 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_IMETHOD 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_IMETHOD 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_IMETHOD 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_IMETHOD 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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//--------------------------------------------------------------------
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// Interface nsICharRepresentable [declaration]
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NS_IMETHOD 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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protected:
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PRUnichar mBOM;
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virtual void CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
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{
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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};
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};
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class nsUnicodeToUTF16DiffEndian: public nsUnicodeToUTF16SameEndian
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{
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public:
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/**
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* Class constructor.
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*/
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nsUnicodeToUTF16DiffEndian( PRUnichar aBOM )
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: nsUnicodeToUTF16SameEndian(aBOM ) { };
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/**
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* Class destructor.
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*/
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virtual ~nsUnicodeToUTF16DiffEndian() {};
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//--------------------------------------------------------------------
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// Interface nsIUnicodeEncoder [declaration]
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protected:
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virtual void CopyData(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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};
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static char BOM[] = {(char)0xfe, (char)0xff};
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#define IsBigEndian() (0xFEFF == *((PRUint16*)BOM))
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nsresult NEW_UnicodeToUTF16BE(nsISupports **aResult)
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{
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if(IsBigEndian()) {
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*aResult = (nsIUnicodeEncoder*)new nsUnicodeToUTF16SameEndian(0);
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} else {
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*aResult = (nsIUnicodeEncoder*)new nsUnicodeToUTF16DiffEndian(0);
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}
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return (NULL == *aResult) ? NS_ERROR_OUT_OF_MEMORY : NS_OK;
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}
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nsresult NEW_UnicodeToUTF16LE(nsISupports **aResult)
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{
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if(IsBigEndian()) {
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*aResult = (nsIUnicodeEncoder*)new nsUnicodeToUTF16DiffEndian(0);
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} else {
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*aResult = (nsIUnicodeEncoder*)new nsUnicodeToUTF16SameEndian(0);
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}
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return (NULL == *aResult) ? NS_ERROR_OUT_OF_MEMORY : NS_OK;
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}
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nsresult NEW_UnicodeToUTF16(nsISupports **aResult)
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{
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*aResult = (nsIUnicodeEncoder*)new nsUnicodeToUTF16SameEndian(0xFEFF);
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return (NULL == *aResult) ? NS_ERROR_OUT_OF_MEMORY : NS_OK;
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}
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//============== above code is obsolete ==============================
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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::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 nsUnicodeToUTF16BE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
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{
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if(IsBigEndian()) {
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//UnicodeToUTF16SameEndian
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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}
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else {
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//UnicodeToUTF16DiffEndian
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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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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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if(!IsBigEndian()) {
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//UnicodeToUTF16SameEndian
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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}
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else {
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//UnicodeToUTF16DiffEndian
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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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return NS_OK;
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}
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