sippeangelo
87 lines
3.2 KiB
C++
87 lines
3.2 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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* $Id: XMLBuffer.cpp 932887 2010-04-11 13:04:59Z borisk $
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*/
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// ---------------------------------------------------------------------------
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// Includes
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// ---------------------------------------------------------------------------
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#include <xercesc/framework/XMLBuffer.hpp>
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#include <xercesc/util/XMLString.hpp>
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#include <xercesc/util/RuntimeException.hpp>
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XERCES_CPP_NAMESPACE_BEGIN
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// ---------------------------------------------------------------------------
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// XMLBuffer: Buffer management
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// ---------------------------------------------------------------------------
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void XMLBuffer::ensureCapacity(const XMLSize_t extraNeeded)
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{
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// If we can't handle it, try doubling the buffer size.
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XMLSize_t newCap = (fIndex + extraNeeded) * 2;
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// If a maximum size is set, and double the current buffer size exceeds that
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// maximum, first check if the maximum size will accomodate the extra needed.
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if (fFullHandler && (newCap > fFullSize))
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{
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// If the maximum buffer size accomodates the extra needed, resize to
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// the maximum
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if (fIndex + extraNeeded <= fFullSize)
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{
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newCap = fFullSize;
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}
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// Otherwise, allow the registered full-handler to try to empty the buffer.
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// If it claims success, and we can accommodate the extra needed in the buffer
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// to be expanded, resize to the maximum
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// Note the order of evaluation: bufferFull() has the intentional side-effect
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// of modifying fIndex.
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else if (fFullHandler->bufferFull(*this) && (fIndex + extraNeeded <= fFullSize))
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{
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newCap = fFullSize;
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}
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// Finally, if the full-handler failed, or the buffer (of maximum size)
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// still can't accomodate the extra needed, we must fail.
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else
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ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::Array_BadNewSize, fMemoryManager);
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}
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// Note the previous if block can modify newCap, so we may not need to allocate
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// at all.
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if (newCap > fCapacity)
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{
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// Allocate new buffer
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XMLCh* newBuf = (XMLCh*) fMemoryManager->allocate((newCap+1) * sizeof(XMLCh)); //new XMLCh[newCap+1];
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// Copy over the old stuff
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memcpy(newBuf, fBuffer, fIndex * sizeof(XMLCh));
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// Clean up old buffer and store new stuff
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fMemoryManager->deallocate(fBuffer); //delete [] fBuffer;
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fBuffer = newBuf;
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fCapacity = newCap;
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}
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}
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XERCES_CPP_NAMESPACE_END
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