mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
137 lines
3.2 KiB
C++
137 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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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#include "nsUnicodeToUCS2BE.h"
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#include <string.h>
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inline static void SwapBytes(char *aDest, const PRUnichar* aSrc, PRInt32 aLen);
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NS_IMETHODIMP nsUnicodeToUTF16BE::Convert(const PRUnichar * aSrc, PRInt32 * aSrcLength,
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char * aDest, PRInt32 * aDestLength)
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{
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PRInt32 srcInLen = *aSrcLength;
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PRInt32 destInLen = *aDestLength;
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PRInt32 srcOutLen = 0;
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PRInt32 destOutLen = 0;
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PRInt32 copyCharLen;
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PRUnichar *p = (PRUnichar*)aDest;
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// Handle BOM if necessary
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if(0!=mBOM)
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{
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if(destInLen <2)
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goto needmoreoutput;
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*p++ = mBOM;
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mBOM = 0;
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destOutLen +=2;
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}
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// find out the length of copy
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copyCharLen = srcInLen;
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if(copyCharLen > (destInLen - destOutLen) / 2) {
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copyCharLen = (destInLen - destOutLen) / 2;
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}
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// copy the data by swaping
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CopyData((char*)p , aSrc, copyCharLen );
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srcOutLen += copyCharLen;
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destOutLen += copyCharLen * 2;
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if(copyCharLen < srcInLen)
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goto needmoreoutput;
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*aSrcLength = srcOutLen;
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*aDestLength = destOutLen;
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return NS_OK;
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needmoreoutput:
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*aSrcLength = srcOutLen;
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*aDestLength = destOutLen;
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return NS_OK_UENC_MOREOUTPUT;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::GetMaxLength(const PRUnichar * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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if(0 != mBOM)
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*aDestLength = 2*(aSrcLength+1);
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else
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*aDestLength = 2*aSrcLength;
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return NS_OK_UENC_EXACTLENGTH;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::Finish(char * aDest, PRInt32 * aDestLength)
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{
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if(0 != mBOM)
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{
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if(*aDestLength >= 2)
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{
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*((PRUnichar*)aDest)= mBOM;
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mBOM=0;
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*aDestLength = 2;
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return NS_OK;
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} else {
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*aDestLength = 0;
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return NS_OK; // xxx should be error
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}
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} else {
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*aDestLength = 0;
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return NS_OK;
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}
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::Reset()
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{
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mBOM = 0;
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::SetOutputErrorBehavior(PRInt32 aBehavior,
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nsIUnicharEncoder * aEncoder, PRUnichar aChar)
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{
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF16BE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
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{
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#ifdef IS_BIG_ENDIAN
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//UnicodeToUTF16SameEndian
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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#elif defined(IS_LITTLE_ENDIAN)
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//UnicodeToUTF16DiffEndian
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SwapBytes(aDest, aSrc, aLen);
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#else
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#error "Unknown endianness"
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#endif
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToUTF16LE::CopyData(char* aDest, const PRUnichar* aSrc, PRInt32 aLen )
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{
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#ifdef IS_LITTLE_ENDIAN
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//UnicodeToUTF16SameEndian
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::memcpy(aDest, (void*) aSrc, aLen * 2);
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#elif defined(IS_BIG_ENDIAN)
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//UnicodeToUTF16DiffEndian
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SwapBytes(aDest, aSrc, aLen);
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#else
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#error "Unknown endianness"
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#endif
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return NS_OK;
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}
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inline void SwapBytes(char *aDest, const PRUnichar* aSrc, PRInt32 aLen)
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{
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PRUnichar *p = (PRUnichar*) aDest;
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// copy the data by swaping
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for(PRInt32 i = 0; i < aLen; i++)
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{
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PRUnichar aChar = *aSrc++;
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*p++ = (0x00FF & (aChar >> 8)) | (0xFF00 & (aChar << 8));
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}
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}
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