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144 lines
4.5 KiB
C++
144 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape 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/NPL/
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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
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* Corporation. Portions created by Netscape 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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#include "nsUEscapeToUnicode.h"
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//----------------------------------------------------------------------
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// Subclassing of nsTableDecoderSupport class [implementation]
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NS_IMETHODIMP nsUEscapeToUnicode::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 + mBufferLen);
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return NS_OK;
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}
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NS_IMETHODIMP nsUEscapeToUnicode::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* srcPtr = aSrc;
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const char* srcEnd = aSrc + *aSrcLength;
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PRUnichar* destPtr = aDest;
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PRUnichar* destEnd = aDest + *aDestLength;
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while((mBufferLen >0) && (destPtr < destEnd))
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*destPtr++ = mBuffer[--mBufferLen];
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for(;(srcPtr < srcEnd) && (destPtr < destEnd); srcPtr++)
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{
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switch(mState)
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{
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case 0:
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if('\\' == *srcPtr) {
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mState++;
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} else {
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if(0x80 == (0x80 & *srcPtr))
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{
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*destPtr++ = (PRUnichar)0xFFFD;
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} else {
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*destPtr++ = (PRUnichar)*srcPtr;
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}
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}
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break;
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case 1: // got a '\'
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if(('u' == *srcPtr) || ('U' == *srcPtr)) {
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mState++;
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mData=0;
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} else if(('n' == *srcPtr) || ('r' == *srcPtr) || ('t' == *srcPtr)) {
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mState =0;
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if((destPtr+2) >= destEnd) {
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// notice the data in mBuffer is stored in reversed order
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mBufferLen = 2;
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mBuffer[1] = PRUnichar('\\') ;
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mBuffer[0] = (PRUnichar)*srcPtr;
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goto error;
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}
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*destPtr++ = PRUnichar('\\');
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*destPtr++ = (PRUnichar)*srcPtr;
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} else {
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mState =0;
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*destPtr++ = (PRUnichar)*srcPtr;
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}
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break;
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case 2: // got \u
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case 3: // got \u1
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case 4: // got \u12
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case 5: // got \u123
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if(('0' <= *srcPtr) && (*srcPtr <='9')) {
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mData = (mData << 4) | (*srcPtr - '0');
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mState++;
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} else if(('a' <= *srcPtr) && (*srcPtr <='f')) {
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mData = (mData << 4) | ((*srcPtr - 'a') + 0x0a);
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mState++;
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} else if(('A' <= *srcPtr) && (*srcPtr <='F')) {
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mData = (mData << 4) | ((*srcPtr - 'A') + 0x0a);
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mState++;
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} else {
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// if we got \u , \u2 , \u34
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if((destPtr+2) >= destEnd) {
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// notice the data in mBuffer is stored in reversed order
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mBufferLen = 2;
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mBuffer[1] = (PRUnichar) mData;
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mBuffer[0] = (PRUnichar)*srcPtr;
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mState=0;
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goto error;
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}
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*destPtr++ = (PRUnichar) mData;
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*destPtr++ = (PRUnichar)*srcPtr;
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mState=0;
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}
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if(6==mState) // got \u1234
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{
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*destPtr++ = (PRUnichar) mData;
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mState = 0;
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}
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break;
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default:
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break;
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};
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}
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*aDestLength = destPtr - aDest;
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*aSrcLength = srcPtr - aSrc;
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return NS_OK;
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error:
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*aDestLength = destPtr - aDest;
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*aSrcLength = srcPtr - aSrc;
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return NS_OK_UDEC_MOREOUTPUT;
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}
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NS_IMETHODIMP nsUEscapeToUnicode::Reset()
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{
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mState =0;
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mData=0;
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mBufferLen =0;
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return NS_OK;
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}
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nsresult NEW_UEscapeToUnicode(nsISupports **aResult)
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{
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*aResult = new nsUEscapeToUnicode();
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return (NULL == *aResult) ? NS_ERROR_OUT_OF_MEMORY : NS_OK;
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}
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