sippeangelo
241 lines
8.0 KiB
C++
241 lines
8.0 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// ---------------------------------------------------------------------------
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// Includes
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// ---------------------------------------------------------------------------
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#include <xercesc/util/BitOps.hpp>
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#include <xercesc/util/XMLUCS4Transcoder.hpp>
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#include <xercesc/util/TranscodingException.hpp>
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#include <string.h>
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XERCES_CPP_NAMESPACE_BEGIN
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// ---------------------------------------------------------------------------
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// XMLUCS4Transcoder: Constructors and Destructor
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// ---------------------------------------------------------------------------
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XMLUCS4Transcoder::XMLUCS4Transcoder(const XMLCh* const encodingName
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, const XMLSize_t blockSize
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, const bool swapped
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, MemoryManager* const manager) :
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XMLTranscoder(encodingName, blockSize, manager)
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, fSwapped(swapped)
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{
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}
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XMLUCS4Transcoder::~XMLUCS4Transcoder()
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{
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}
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// ---------------------------------------------------------------------------
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// XMLUCS4Transcoder: Implementation of the transcoder API
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// ---------------------------------------------------------------------------
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XMLSize_t
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XMLUCS4Transcoder::transcodeFrom(const XMLByte* const srcData
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, const XMLSize_t srcCount
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, XMLCh* const toFill
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, const XMLSize_t maxChars
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, XMLSize_t& bytesEaten
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, unsigned char* const charSizes)
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{
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//
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// Get pointers to the start and end of the source buffer in terms of
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// UCS-4 characters.
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//
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const UCS4Ch* srcPtr = (const UCS4Ch*)srcData;
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const UCS4Ch* srcEnd = srcPtr + (srcCount / sizeof(UCS4Ch));
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//
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// Get pointers to the start and end of the target buffer, which is
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// in terms of the XMLCh chars we output.
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//
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XMLCh* outPtr = toFill;
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XMLCh* outEnd = toFill + maxChars;
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//
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// And get a pointer into the char sizes buffer. We will run this
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// up as we put chars into the output buffer.
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//
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unsigned char* sizePtr = charSizes;
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//
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// Now process chars until we either use up all our source or all of
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// our output space.
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//
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while ((outPtr < outEnd) && (srcPtr < srcEnd))
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{
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//
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// Get the next UCS char out of the buffer. Don't bump the ptr
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// yet since we might not have enough storage for it in the target
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// (if its causes a surrogate pair to be created.
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//
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UCS4Ch nextVal = *srcPtr;
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// If it needs to be swapped, then do it
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if (fSwapped)
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nextVal = BitOps::swapBytes(nextVal);
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// Handle a surrogate pair if needed
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if (nextVal & 0xFFFF0000)
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{
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//
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// If we don't have room for both of the chars, then we
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// bail out now.
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//
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if (outPtr + 1 == outEnd)
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break;
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const XMLInt32 LEAD_OFFSET = 0xD800 - (0x10000 >> 10);
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const XMLCh ch1 = XMLCh(LEAD_OFFSET + (nextVal >> 10));
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const XMLCh ch2 = XMLCh(0xDC00 + (nextVal & 0x3FF));
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//
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// We have room so store them both. But note that the
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// second one took up no source bytes!
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//
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*sizePtr++ = sizeof(UCS4Ch);
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*outPtr++ = ch1;
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*sizePtr++ = 0;
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*outPtr++ = ch2;
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}
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else
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{
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//
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// No surrogate, so just store it and bump the count of chars
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// read. Update the char sizes buffer for this char's entry.
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//
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*sizePtr++ = sizeof(UCS4Ch);
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*outPtr++ = XMLCh(nextVal);
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}
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// Indicate that we ate another UCS char's worth of bytes
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srcPtr++;
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}
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// Set the bytes eaten parameter
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bytesEaten = ((const XMLByte*)srcPtr) - srcData;
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// And return the chars written into the output buffer
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return outPtr - toFill;
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}
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XMLSize_t
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XMLUCS4Transcoder::transcodeTo( const XMLCh* const srcData
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, const XMLSize_t srcCount
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, XMLByte* const toFill
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, const XMLSize_t maxBytes
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, XMLSize_t& charsEaten
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, const UnRepOpts)
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{
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//
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// Get pointers to the start and end of the source buffer, which
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// is in terms of XMLCh chars.
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//
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const XMLCh* srcPtr = srcData;
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const XMLCh* srcEnd = srcData + srcCount;
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//
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// Get pointers to the start and end of the target buffer, in terms
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// of UCS-4 chars.
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//
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UCS4Ch* outPtr = (UCS4Ch*)toFill;
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UCS4Ch* outEnd = outPtr + (maxBytes / sizeof(UCS4Ch));
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//
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// Now loop until we either run out of source characters or we
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// fill up our output buffer.
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//
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XMLCh trailCh;
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while ((outPtr < outEnd) && (srcPtr < srcEnd))
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{
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//
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// Get out an XMLCh char from the source. Don't bump up the
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// pointer yet, since it might be a leading for which we don't
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// have the trailing.
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//
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const XMLCh curCh = *srcPtr;
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//
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// If its a leading char of a surrogate pair handle it one way,
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// else just cast it over into the target.
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//
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if ((curCh >= 0xD800) && (curCh <= 0xDBFF))
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{
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//
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// Ok, we have to have another source char available or we
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// just give up without eating the leading char.
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//
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if (srcPtr + 1 == srcEnd)
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break;
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//
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// We have the trailing char, so eat the first char and the
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// trailing char from the source.
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//
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srcPtr++;
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trailCh = *srcPtr++;
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//
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// Then make sure its a legal trailing char. If not, throw
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// an exception.
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//
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if ( !( (trailCh >= 0xDC00) && (trailCh <= 0xDFFF) ) )
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ThrowXMLwithMemMgr(TranscodingException, XMLExcepts::Trans_BadTrailingSurrogate, getMemoryManager());
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// And now combine the two into a single output char
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const XMLInt32 SURROGATE_OFFSET = 0x10000 - (0xD800 << 10) - 0xDC00;
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*outPtr++ = (curCh << 10) + trailCh + SURROGATE_OFFSET;
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}
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else
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{
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//
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// Its just a char, so we can take it as is. If we need to
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// swap it, then swap it. Because of flakey compilers, use
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// a temp first.
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//
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const UCS4Ch tmpCh = UCS4Ch(curCh);
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if (fSwapped)
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*outPtr++ = BitOps::swapBytes(tmpCh);
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else
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*outPtr++ = tmpCh;
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// Bump the source pointer
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srcPtr++;
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}
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}
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// Set the chars we ate from the source
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charsEaten = srcPtr - srcData;
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// Return the bytes we wrote to the output
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return ((XMLByte*)outPtr) - toFill;
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}
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bool XMLUCS4Transcoder::canTranscodeTo(const unsigned int)
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{
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// We can handle anything
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return true;
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}
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XERCES_CPP_NAMESPACE_END
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