gecko/intl/uconv/ucvlatin/nsUnicodeToUTF16.cpp
Masatoshi Kimura 5477b5fa0b Bug 782412 - Part 1: Rename UCS2BE to UTF16. r=smontagu
--HG--
rename : intl/uconv/ucvlatin/nsUCS2BEToUnicode.cpp => intl/uconv/ucvlatin/nsUTF16ToUnicode.cpp
rename : intl/uconv/ucvlatin/nsUCS2BEToUnicode.h => intl/uconv/ucvlatin/nsUTF16ToUnicode.h
rename : intl/uconv/ucvlatin/nsUnicodeToUCS2BE.cpp => intl/uconv/ucvlatin/nsUnicodeToUTF16.cpp
rename : intl/uconv/ucvlatin/nsUnicodeToUCS2BE.h => intl/uconv/ucvlatin/nsUnicodeToUTF16.h
2012-11-26 20:38:20 -05:00

137 lines
3.2 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 "nsUnicodeToUTF16.h"
#include <string.h>
inline static void SwapBytes(char *aDest, const PRUnichar* aSrc, int32_t aLen);
NS_IMETHODIMP nsUnicodeToUTF16BE::Convert(const PRUnichar * aSrc, int32_t * aSrcLength,
char * aDest, int32_t * aDestLength)
{
int32_t srcInLen = *aSrcLength;
int32_t destInLen = *aDestLength;
int32_t srcOutLen = 0;
int32_t destOutLen = 0;
int32_t 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, int32_t aSrcLength,
int32_t * aDestLength)
{
if(0 != mBOM)
*aDestLength = 2*(aSrcLength+1);
else
*aDestLength = 2*aSrcLength;
return NS_OK_UENC_EXACTLENGTH;
}
NS_IMETHODIMP nsUnicodeToUTF16BE::Finish(char * aDest, int32_t * 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(int32_t aBehavior,
nsIUnicharEncoder * aEncoder, PRUnichar aChar)
{
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToUTF16BE::CopyData(char* aDest, const PRUnichar* aSrc, int32_t 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, int32_t 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, int32_t aLen)
{
PRUnichar *p = (PRUnichar*) aDest;
// copy the data by swaping
for(int32_t i = 0; i < aLen; i++)
{
PRUnichar aChar = *aSrc++;
*p++ = (0x00FF & (aChar >> 8)) | (0xFF00 & (aChar << 8));
}
}