зеркало из https://github.com/mozilla/pjs.git
234 строки
7.9 KiB
C++
234 строки
7.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:expandtab:shiftwidth=2:tabstop=2:
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jungshik Shin <jshin@mailaps.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsUCSupport.h"
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#include "nsUTF32ToUnicode.h"
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#include "nsCharTraits.h"
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#include <string.h>
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//----------------------------------------------------------------------
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// static functions and macro definition common to nsUTF32(BE|LE)ToUnicode
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#ifdef IS_BIG_ENDIAN
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#define LE_STRING_TO_UCS4(s) \
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(PRUint8(*(s)) | (PRUint8(*((s) + 1)) << 8) | \
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(PRUint8(*((s) + 2)) << 16) | (PRUint8(*((s) + 3)) << 24))
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#else
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#define LE_STRING_TO_UCS4(s) (*(PRUint32*) (s))
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#endif
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#ifdef IS_BIG_ENDIAN
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#define BE_STRING_TO_UCS4(s) (*(PRUint32*) (s))
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#else
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#define BE_STRING_TO_UCS4(s) \
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(PRUint8(*((s) + 3)) | (PRUint8(*((s) + 2)) << 8) | \
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(PRUint8(*((s) + 1)) << 16) | (PRUint8(*(s)) << 24))
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#endif
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static nsresult ConvertCommon(const char * aSrc,
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PRInt32 * aSrcLength,
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PRUnichar * aDest,
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PRInt32 * aDestLength,
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PRUint16 * aState,
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PRUint8 * aBuffer,
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PRBool aIsLE)
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{
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NS_ENSURE_TRUE(*aState < 4, NS_ERROR_INVALID_ARG);
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NS_ENSURE_TRUE(*aDestLength > 0, NS_ERROR_INVALID_ARG);
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const char *src = aSrc;
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const char *srcEnd = aSrc + *aSrcLength;
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PRUnichar *dest = aDest;
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PRUnichar *destEnd = aDest + *aDestLength;
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if (*aState > *aSrcLength)
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{
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memcpy(aBuffer + 4 - *aState, src, *aSrcLength);
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*aDestLength = 0;
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*aState -= *aSrcLength;
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return NS_OK_UDEC_MOREINPUT;
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}
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PRUint32 ucs4;
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// prev. run left a partial UTF-32 seq.
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if (*aState > 0)
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{
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memcpy(aBuffer + 4 - *aState, src, *aState);
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ucs4 = aIsLE ? LE_STRING_TO_UCS4(aBuffer) : BE_STRING_TO_UCS4(aBuffer);
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if (ucs4 < 0x10000L) // BMP
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{
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*dest++= IS_SURROGATE(ucs4) ? UCS2_REPLACEMENT_CHAR : PRUnichar(ucs4);
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}
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else if (ucs4 < 0x110000L) // plane 1 through plane 16
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{
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if (destEnd - dest < 2)
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{
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*aSrcLength = 0;
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*aDestLength = 0;
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return NS_OK_UDEC_MOREOUTPUT;
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}
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*dest++= H_SURROGATE(ucs4);
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*dest++= L_SURROGATE(ucs4);
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}
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// Codepoints in plane 17 and higher (> 0x10ffff)
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// are not representable in UTF-16 we use for the internal
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// character representation. This is not a problem
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// because Unicode/ISO 10646 will never assign characters
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// in plane 17 and higher. Therefore, we convert them
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// to Unicode replacement character (0xfffd).
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else
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*dest++ = UCS2_REPLACEMENT_CHAR;
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src += *aState;
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*aState = 0;
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}
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nsresult rv = NS_OK; // conversion result
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for ( ; src < srcEnd && dest < destEnd; src += 4)
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{
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if (srcEnd - src < 4)
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{
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// fill up aBuffer until src buffer gets exhausted.
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memcpy(aBuffer, src, srcEnd - src);
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*aState = 4 - (srcEnd - src); // set add. char to read in next run
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src = srcEnd;
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rv = NS_OK_UDEC_MOREINPUT;
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break;
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}
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ucs4 = aIsLE ? LE_STRING_TO_UCS4(src) : BE_STRING_TO_UCS4(src);
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if (ucs4 < 0x10000L) // BMP
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{
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*dest++= IS_SURROGATE(ucs4) ? UCS2_REPLACEMENT_CHAR : PRUnichar(ucs4);
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}
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else if (ucs4 < 0x110000L) // plane 1 through plane 16
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{
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if (destEnd - dest < 2)
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break;
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// ((ucs4 - 0x10000) >> 10) + 0xd800;
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*dest++= H_SURROGATE(ucs4);
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*dest++= L_SURROGATE(ucs4);
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}
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else // plane 17 and higher
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*dest++ = UCS2_REPLACEMENT_CHAR;
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}
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//output not finished, output buffer too short
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if((NS_OK == rv) && (src < srcEnd) && (dest >= destEnd))
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rv = NS_OK_UDEC_MOREOUTPUT;
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*aSrcLength = src - aSrc;
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*aDestLength = dest - aDest;
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return rv;
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}
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//----------------------------------------------------------------------
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// Class nsUTF32ToUnicode [implementation]
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nsUTF32ToUnicode::nsUTF32ToUnicode() : nsBasicDecoderSupport()
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{
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Reset();
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}
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//----------------------------------------------------------------------
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// Subclassing of nsDecoderSupport class [implementation]
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NS_IMETHODIMP nsUTF32ToUnicode::GetMaxLength(const char * aSrc,
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PRInt32 aSrcLength,
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PRInt32 * aDestLength)
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{
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// Non-BMP characters take two PRUnichars(a pair of surrogate codepoints)
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// so that we have to divide by 2 instead of 4 for the worst case.
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*aDestLength = aSrcLength / 2;
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return NS_OK;
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}
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//----------------------------------------------------------------------
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// Subclassing of nsBasicDecoderSupport class [implementation]
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NS_IMETHODIMP nsUTF32ToUnicode::Reset()
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{
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// the number of additional bytes to read to complete UTF-32 4byte seq.
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mState = 0;
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memset(mBufferInc, 0, 4);
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return NS_OK;
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}
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//----------------------------------------------------------------------
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// Class nsUTF32BEToUnicode [implementation]
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//----------------------------------------------------------------------
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// Subclassing of nsUTF32ToUnicode class [implementation]
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NS_IMETHODIMP nsUTF32BEToUnicode::Convert(const char * aSrc,
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PRInt32 * aSrcLength,
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PRUnichar * aDest,
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PRInt32 * aDestLength)
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{
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return ConvertCommon(aSrc, aSrcLength, aDest, aDestLength, &mState,
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mBufferInc, PR_FALSE);
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}
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//----------------------------------------------------------------------
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// Class nsUTF32LEToUnicode [implementation]
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//----------------------------------------------------------------------
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// Subclassing of nsUTF32ToUnicode class [implementation]
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NS_IMETHODIMP nsUTF32LEToUnicode::Convert(const char * aSrc,
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PRInt32 * aSrcLength,
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PRUnichar * aDest,
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PRInt32 * aDestLength)
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{
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return ConvertCommon(aSrc, aSrcLength, aDest, aDestLength, &mState,
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mBufferInc, PR_TRUE);
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}
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// XXX : What to do with 'unflushed' mBufferInc?? : Finish()
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