gecko-dev/intl/uconv/ucvcn/nsUnicodeToGB2312V2.cpp

66 строки
2.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsUnicodeToGB2312V2.h"
#include "gbku.h"
//----------------------------------------------------------------------
// Class nsUnicodeToGB2312V2 [implementation]
nsUnicodeToGB2312V2::nsUnicodeToGB2312V2() :
nsEncoderSupport(2)
{
}
NS_IMETHODIMP nsUnicodeToGB2312V2::ConvertNoBuff(const PRUnichar * aSrc,
int32_t * aSrcLength,
char * aDest,
int32_t * aDestLength)
{
int32_t iSrcLength = 0;
int32_t iDestLength = 0;
nsresult res = NS_OK;
while (iSrcLength < *aSrcLength)
{
//if unicode's hi byte has something, it is not ASCII, must be a GB
if(IS_ASCII(*aSrc))
{
// this is an ASCII
*aDest = CAST_UNICHAR_TO_CHAR(*aSrc);
aDest++; // increment 1 byte
iDestLength +=1;
} else {
char byte1, byte2;
if(mUtil.UnicodeToGBKChar(*aSrc, false, &byte1, &byte2))
{
if(iDestLength+2 > *aDestLength)
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
aDest[0]=byte1;
aDest[1]=byte2;
aDest += 2; // increment 2 bytes
iDestLength +=2; // each GB char count as two in char* string
} else {
// cannot convert
res= NS_ERROR_UENC_NOMAPPING;
iSrcLength++; // include length of the unmapped character
break;
}
}
iSrcLength++ ; // each unicode char just count as one in PRUnichar* string
aSrc++;
if ( iDestLength >= (*aDestLength) && (iSrcLength < *aSrcLength ))
{
res = NS_OK_UENC_MOREOUTPUT;
break;
}
}
*aDestLength = iDestLength;
*aSrcLength = iSrcLength;
return res;
}