mirror of
https://github.com/mozilla/gecko-dev.git
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391 lines
9.9 KiB
C++
391 lines
9.9 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: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsUCS2BEToUnicode.h"
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#include "nsUCvLatinDll.h"
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#include <string.h>
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#include "prtypes.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 nsUCS2BEToUnicode [implementation]
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nsUCS2BEToUnicode::nsUCS2BEToUnicode()
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: nsTableDecoderSupport((uShiftTable*) &g_UCS2BEShiftTable,
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(uMappingTable*) &g_UCS2BEMappingTable, 0)
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{
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}
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//----------------------------------------------------------------------
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// Subclassing of nsTableDecoderSupport class [implementation]
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NS_IMETHODIMP nsUCS2BEToUnicode::GetMaxLength(const char * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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if(0 == (aSrcLength % 2))
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{
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*aDestLength = aSrcLength / 2;
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return NS_OK_UENC_EXACTLENGTH;
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} else {
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*aDestLength = (aSrcLength + 1) / 2;
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return NS_OK;
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}
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}
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class nsUTF16SameEndianToUnicode : public nsBasicDecoderSupport
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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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nsUTF16SameEndianToUnicode() { Reset();};
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NS_IMETHOD Convert(const char * aSrc, PRInt32 * aSrcLength,
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PRUnichar * aDest, PRInt32 * aDestLength);
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NS_IMETHOD Reset();
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protected:
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//--------------------------------------------------------------------
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// Subclassing of nsDecoderSupport class [declaration]
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NS_IMETHOD GetMaxLength(const char * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength);
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protected:
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PRUint8 mState;
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PRUint8 mData;
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};
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//----------------------------------------------------------------------
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// Subclassing of nsTableDecoderSupport class [implementation]
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NS_IMETHODIMP nsUTF16SameEndianToUnicode::GetMaxLength(const char * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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*aDestLength = (aSrcLength + ((1==mState)?1:0))/2;
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return NS_OK;
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}
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NS_IMETHODIMP nsUTF16SameEndianToUnicode::Convert(
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const char * aSrc, PRInt32 * aSrcLength,
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PRUnichar * aDest, PRInt32 * aDestLength)
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{
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const char* src = aSrc;
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const char* srcEnd = aSrc + *aSrcLength;
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PRUnichar* dest = aDest;
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PRUnichar* destEnd = aDest + *aDestLength;
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PRInt32 copybytes;
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if(2 == mState) // first time called
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{
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// eleminate BOM
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if(0xFEFF == *((PRUnichar*)src)) {
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src+=2;
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} else if(0xFFFE == *((PRUnichar*)src)) {
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*aSrcLength=0;
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*aDestLength=0;
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return NS_ERROR_ILLEGAL_INPUT;
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}
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mState=0;
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}
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if((1 == mState) && (src < srcEnd))
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{
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if(dest >= destEnd)
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goto error;
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if(src>=srcEnd)
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goto done;
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char tmpbuf[2];
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PRUnichar * up = (PRUnichar*) &tmpbuf[0];
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tmpbuf[0]= mData;
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tmpbuf[1]= *src++;
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*dest++ = *up;
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}
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copybytes = (destEnd-dest)*2;
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if(copybytes > (0xFFFE & (srcEnd-src)))
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copybytes = 0xFFFE & (srcEnd-src);
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memcpy(dest,src,copybytes);
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src +=copybytes;
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dest +=(copybytes/2);
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if(srcEnd==src) {
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mState = 0;
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} else if(1 == (srcEnd-src) ) {
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mState = 1;
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mData = *src++;
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} else {
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goto error;
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}
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done:
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*aDestLength = dest - aDest;
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*aSrcLength = src - aSrc;
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return NS_OK;
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error:
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*aDestLength = dest - aDest;
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*aSrcLength = src - aSrc;
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return NS_OK_UDEC_MOREOUTPUT;
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}
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NS_IMETHODIMP nsUTF16SameEndianToUnicode::Reset()
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{
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mState =2;
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mData=0;
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return NS_OK;
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}
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class nsUTF16DiffEndianToUnicode : public nsUTF16SameEndianToUnicode
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{
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public:
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nsUTF16DiffEndianToUnicode() {};
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NS_IMETHOD Convert(const char * aSrc, PRInt32 * aSrcLength,
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PRUnichar * aDest, PRInt32 * aDestLength);
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};
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NS_IMETHODIMP nsUTF16DiffEndianToUnicode::Convert(
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const char * aSrc, PRInt32 * aSrcLength,
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PRUnichar * aDest, PRInt32 * aDestLength)
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{
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if(2 == mState) // first time called
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{
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if(0xFFFE == *((PRUnichar*)aSrc)) {
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aSrc+=2;
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*aSrcLength-=2;
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} else if(0xFEFF == *((PRUnichar*)aSrc)) {
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// eleminate BOM
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*aSrcLength=0;
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*aDestLength=0;
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return NS_ERROR_ILLEGAL_INPUT;
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}
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mState=0;
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}
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nsresult res = nsUTF16SameEndianToUnicode::Convert(aSrc,aSrcLength, aDest, aDestLength);
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PRInt32 i;
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// copy
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char* p;
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p=(char*)aDest;
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for(i=*aDestLength; i>0 ;i--,p+=2)
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{
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char tmp = *(p+1);
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*(p+1) = *p;
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*(p)= tmp;
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}
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return res;
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}
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nsresult UTF16ConvertToUnicode(PRUint8& aState, PRUint8& aData, const char * aSrc, PRInt32 * aSrcLength, PRUnichar * aDest, PRInt32 * aDestLength)
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{
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const char* src = aSrc;
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const char* srcEnd = aSrc + *aSrcLength;
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PRUnichar* dest = aDest;
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PRUnichar* destEnd = aDest + *aDestLength;
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PRInt32 copybytes;
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if(2 == aState) // first time called
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{
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// eleminate BOM
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if(0xFEFF == *((PRUnichar*)src)) {
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src+=2;
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} else if(0xFFFE == *((PRUnichar*)src)) {
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*aSrcLength=0;
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*aDestLength=0;
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return NS_ERROR_ILLEGAL_INPUT;
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}
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aState=0;
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}
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if((1 == aState) && (src < srcEnd))
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{
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if(dest >= destEnd)
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goto error;
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if(src>=srcEnd)
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goto done;
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char tmpbuf[2];
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PRUnichar * up = (PRUnichar*) &tmpbuf[0];
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tmpbuf[0]= aData;
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tmpbuf[1]= *src++;
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*dest++ = *up;
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}
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copybytes = (destEnd-dest)*2;
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if(copybytes > (0xFFFE & (srcEnd-src)))
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copybytes = 0xFFFE & (srcEnd-src);
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memcpy(dest,src,copybytes);
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src +=copybytes;
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dest +=(copybytes/2);
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if(srcEnd==src) {
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aState = 0;
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} else if(1 == (srcEnd-src) ) {
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aState = 1;
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aData = *src++;
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} else {
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goto error;
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}
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done:
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*aDestLength = dest - aDest;
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*aSrcLength = src - aSrc;
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return NS_OK;
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error:
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*aDestLength = dest - aDest;
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*aSrcLength = src - aSrc;
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return NS_OK_UDEC_MOREOUTPUT;
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}
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NS_IMETHODIMP nsUTF16BEToUnicode::Reset()
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{
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mState =2;
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mData=0;
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return NS_OK;
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}
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NS_IMETHODIMP nsUTF16BEToUnicode::Convert(const char * aSrc, PRInt32 * aSrcLength,
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PRUnichar * aDest, PRInt32 * aDestLength)
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{
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#ifdef IS_LITTLE_ENDIAN
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// process nsUTF16DiffEndianToUnicode
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if(2 == mState) // first time called
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{
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if(0xFFFE == *((PRUnichar*)aSrc)) {
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aSrc+=2;
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*aSrcLength-=2;
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} else if(0xFEFF == *((PRUnichar*)aSrc)) {
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// eleminate BOM
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*aSrcLength=0;
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*aDestLength=0;
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return NS_ERROR_ILLEGAL_INPUT;
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}
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mState=0;
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}
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#endif
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nsresult res = UTF16ConvertToUnicode(mState, mData, aSrc, aSrcLength, aDest, aDestLength);
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#ifdef IS_LITTLE_ENDIAN
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// process nsUTF16DiffEndianToUnicode
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PRInt32 i;
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// copy
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char* p;
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p=(char*)aDest;
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for(i=*aDestLength; i>0 ;i--,p+=2)
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{
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char tmp = *(p+1);
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*(p+1) = *p;
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*(p)= tmp;
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}
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#endif
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return res;
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}
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NS_IMETHODIMP nsUTF16BEToUnicode::GetMaxLength(const char * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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*aDestLength = (aSrcLength + ((1==mState)?1:0))/2;
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return NS_OK;
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}
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NS_IMETHODIMP nsUTF16LEToUnicode::Reset()
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{
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mState =2;
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mData=0;
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return NS_OK;
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}
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NS_IMETHODIMP nsUTF16LEToUnicode::Convert(const char * aSrc, PRInt32 * aSrcLength,
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PRUnichar * aDest, PRInt32 * aDestLength)
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{
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#ifdef IS_BIG_ENDIAN
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// process nsUTF16DiffEndianToUnicode
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if(2 == mState) // first time called
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{
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if(0xFFFE == *((PRUnichar*)aSrc)) {
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aSrc+=2;
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*aSrcLength-=2;
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} else if(0xFEFF == *((PRUnichar*)aSrc)) {
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// eleminate BOM
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*aSrcLength=0;
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*aDestLength=0;
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return NS_ERROR_ILLEGAL_INPUT;
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}
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mState=0;
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}
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#endif
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nsresult res = UTF16ConvertToUnicode(mState, mData, aSrc, aSrcLength, aDest, aDestLength);
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#ifdef IS_BIG_ENDIAN
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// process nsUTF16DiffEndianToUnicode
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PRInt32 i;
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// copy
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char* p;
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p=(char*)aDest;
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for(i=*aDestLength; i>0 ;i--,p+=2)
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{
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char tmp = *(p+1);
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*(p+1) = *p;
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*(p)= tmp;
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}
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#endif
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return res;
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}
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NS_IMETHODIMP nsUTF16LEToUnicode::GetMaxLength(const char * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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*aDestLength = (aSrcLength + ((1==mState)?1:0))/2;
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return NS_OK;
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}
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