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119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* A character set converter from Unicode to HZ.
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*
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*
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* @created 08/Sept/1999
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* @author Yueheng Xu, Yueheng.Xu@intel.com
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* Revision History
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* 04/Oct/1999. Yueheng Xu: Fixed line continuation problem when line
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* ended by '~';
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* Used table UnicodeToGBK[] to speed up the mapping.
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*/
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#include "nsUnicodeToHZ.h"
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#include "nsUCvCnDll.h"
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#include "gbku.h"
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//----------------------------------------------------------------------
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// Class nsUnicodeToGBK [implementation]
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#define HZ_STATE_GB 1
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#define HZ_STATE_ASCII 2
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#define HZ_STATE_TILD 3
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#define HZLEAD1 '~'
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#define HZLEAD2 '{'
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#define HZLEAD3 '}'
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#define UNICODE_TILD 0x007E
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nsUnicodeToHZ::nsUnicodeToHZ() : nsEncoderSupport(6)
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{
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mUtil.InitToGBKTable();
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mHZState = HZ_STATE_ASCII; // per HZ spec, default to HZ mode
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}
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NS_IMETHODIMP nsUnicodeToHZ::ConvertNoBuff(
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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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PRInt32 i=0;
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PRInt32 iSrcLength = *aSrcLength;
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PRInt32 iDestLength = 0;
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for (i=0;i< iSrcLength;i++)
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{
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if(! IS_ASCII(*aSrc))
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{
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// hi byte has something, it is not ASCII, process as a GB
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if ( mHZState != HZ_STATE_GB )
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{
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// we are adding a '~{' ESC sequence to star a HZ string
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mHZState = HZ_STATE_GB;
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aDest[0] = '~';
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aDest[1] = '{';
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aDest += 2; // increment 2 bytes
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iDestLength +=2;
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}
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if(mUtil.UnicodeToGBKChar(*aSrc, true, &aDest[0], &aDest[1])) {
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aDest += 2; // increment 2 bytes
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iDestLength +=2;
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} else {
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// some thing that we cannot convert
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// xxx fix me ftang
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// error handling here
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}
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} else {
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// this is an ASCII
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// if we are in HZ mode, end it by adding a '~}' ESC sequence
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if ( mHZState == HZ_STATE_GB )
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{
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mHZState = HZ_STATE_ASCII;
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aDest[0] = '~';
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aDest[1] = '}';
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aDest += 2; // increment 2 bytes
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iDestLength +=2;
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}
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// if this is a regular char '~' , convert it to two '~'
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if ( *aSrc == UNICODE_TILD )
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{
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aDest[0] = '~';
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aDest[1] = '~';
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aDest += 2; // increment 2 bytes
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iDestLength +=2;
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} else {
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// other regular ASCII chars convert by normal ways
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// Is this works for both little endian and big endian machines ?
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*aDest = (char) ( (PRUnichar)(*aSrc) );
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aDest++; // increment 1 byte
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iDestLength +=1;
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}
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}
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aSrc++; // increment 2 bytes
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if ( iDestLength >= (*aDestLength) )
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{
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break;
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}
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}
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*aDestLength = iDestLength;
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*aSrcLength = i;
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToHZ::FinishNoBuff(char * aDest, PRInt32 * aDestLength)
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{
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if ( mHZState == HZ_STATE_GB )
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{
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// if we are in HZ mode, end it by adding a '~}' ESC sequence
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mHZState = HZ_STATE_ASCII;
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aDest[0] = '~';
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aDest[1] = '}';
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*aDestLength = 2;
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} else {
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*aDestLength = 0;
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}
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return NS_OK;
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}
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