gecko-dev/intl/uconv/ucvlatin/nsUnicodeToUCS2BE.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The contents of this file are subject to the Mozilla Public License Version
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*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsUnicodeToUCS2BE.h"
#include <string.h>
inline static void SwapBytes(char *aDest, const PRUnichar* aSrc, PRInt32 aLen);
NS_IMETHODIMP nsUnicodeToUTF16BE::Convert(const PRUnichar * aSrc, PRInt32 * aSrcLength,
char * aDest, PRInt32 * aDestLength)
{
PRInt32 srcInLen = *aSrcLength;
PRInt32 destInLen = *aDestLength;
PRInt32 srcOutLen = 0;
PRInt32 destOutLen = 0;
PRInt32 copyCharLen;
PRUnichar *p = (PRUnichar*)aDest;
// Handle BOM if necessary
if(0!=mBOM)
{
if(destInLen <2)
goto needmoreoutput;
*p++ = mBOM;
mBOM = 0;
destOutLen +=2;
}
// find out the length of copy
copyCharLen = srcInLen;
if(copyCharLen > (destInLen - destOutLen) / 2) {
copyCharLen = (destInLen - destOutLen) / 2;
}
// copy the data by swaping
CopyData((char*)p , aSrc, copyCharLen );
srcOutLen += copyCharLen;
destOutLen += copyCharLen * 2;
if(copyCharLen < srcInLen)
goto needmoreoutput;
*aSrcLength = srcOutLen;
*aDestLength = destOutLen;
return NS_OK;
needmoreoutput:
*aSrcLength = srcOutLen;
*aDestLength = destOutLen;
return NS_OK_UENC_MOREOUTPUT;
}
NS_IMETHODIMP nsUnicodeToUTF16BE::GetMaxLength(const PRUnichar * aSrc, PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
if(0 != mBOM)
*aDestLength = 2*(aSrcLength+1);
else
*aDestLength = 2*aSrcLength;
return NS_OK_UENC_EXACTLENGTH;
}
NS_IMETHODIMP nsUnicodeToUTF16BE::Finish(char * aDest, PRInt32 * aDestLength)
{
if(0 != mBOM)
{
if(*aDestLength >= 2)
{
*((PRUnichar*)aDest)= mBOM;
mBOM=0;
*aDestLength = 2;
return NS_OK;
} else {
*aDestLength = 0;
return NS_OK; // xxx should be error
}
} else {
*aDestLength = 0;
return NS_OK;
}
}
NS_IMETHODIMP nsUnicodeToUTF16BE::Reset()
{
mBOM = 0;
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToUTF16BE::SetOutputErrorBehavior(PRInt32 aBehavior,
nsIUnicharEncoder * aEncoder, PRUnichar aChar)
{
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToUTF16BE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
{
#ifdef IS_BIG_ENDIAN
//UnicodeToUTF16SameEndian
::memcpy(aDest, (void*) aSrc, aLen * 2);
#elif defined(IS_LITTLE_ENDIAN)
//UnicodeToUTF16DiffEndian
SwapBytes(aDest, aSrc, aLen);
#else
#error "Unknown endianness"
#endif
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToUTF16LE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
{
#ifdef IS_LITTLE_ENDIAN
//UnicodeToUTF16SameEndian
::memcpy(aDest, (void*) aSrc, aLen * 2);
#elif defined(IS_BIG_ENDIAN)
//UnicodeToUTF16DiffEndian
SwapBytes(aDest, aSrc, aLen);
#else
#error "Unknown endianness"
#endif
return NS_OK;
}
inline void SwapBytes(char *aDest, const PRUnichar* aSrc, PRInt32 aLen)
{
PRUnichar *p = (PRUnichar*) aDest;
// copy the data by swaping
for(PRInt32 i = 0; i < aLen; i++)
{
PRUnichar aChar = *aSrc++;
*p++ = (0x00FF & (aChar >> 8)) | (0xFF00 & (aChar << 8));
}
}