XML256TableTranscoder.cpp
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上传日期:2007-01-10
资源大小:6948k
文件大小:9k
源码类别:
xml/soap/webservice
开发平台:
C/C++
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2000 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- // ---------------------------------------------------------------------------
- // Includes
- // ---------------------------------------------------------------------------
- #include <util/BitOps.hpp>
- #include <util/TranscodingException.hpp>
- #include <util/XML256TableTranscoder.hpp>
- #include <util/XMLString.hpp>
- #include <string.h>
- // ---------------------------------------------------------------------------
- // XML256TableTranscoder: Public Destructor
- // ---------------------------------------------------------------------------
- XML256TableTranscoder::~XML256TableTranscoder()
- {
- // We don't own the tables, we just reference them
- }
- // ---------------------------------------------------------------------------
- // XML256TableTranscoder: Implementation of the transcoder API
- // ---------------------------------------------------------------------------
- unsigned int
- XML256TableTranscoder::transcodeFrom(const XMLByte* const srcData
- , const unsigned int srcCount
- , XMLCh* const toFill
- , const unsigned int maxChars
- , unsigned int& bytesEaten
- , unsigned char* const charSizes)
- {
- // If debugging, make sure that the block size is legal
- #if defined(XERCES_DEBUG)
- checkBlockSize(maxChars);
- #endif
- //
- // Calculate the max chars we can do here. Its the lesser of the
- // max output chars and the number of chars in the source.
- //
- const unsigned int countToDo = srcCount < maxChars ? srcCount : maxChars;
- //
- // Loop through the count we have to do and map each char via the
- // lookup table.
- //
- const XMLByte* srcPtr = srcData;
- const XMLByte* endPtr = (srcPtr + countToDo);
- XMLCh* outPtr = toFill;
- while (srcPtr < endPtr)
- {
- const XMLCh uniCh = fFromTable[*srcPtr++];
- if (uniCh != 0xFFFF)
- {
- *outPtr++ = uniCh;
- continue;
- }
- }
- // Set the bytes eaten
- bytesEaten = countToDo;
- // Set the character sizes to the fixed size
- memset(charSizes, 1, countToDo);
- // Return the chars we transcoded
- return countToDo;
- }
- unsigned int
- XML256TableTranscoder::transcodeTo( const XMLCh* const srcData
- , const unsigned int srcCount
- , XMLByte* const toFill
- , const unsigned int maxBytes
- , unsigned int& charsEaten
- , const UnRepOpts options)
- {
- // If debugging, make sure that the block size is legal
- #if defined(XERCES_DEBUG)
- checkBlockSize(maxBytes);
- #endif
- //
- // Calculate the max chars we can do here. Its the lesser of the
- // max output chars and the number of chars in the source.
- //
- const unsigned int countToDo = srcCount < maxBytes ? srcCount : maxBytes;
- //
- // Loop through the count we have to do and map each char via the
- // lookup table.
- //
- const XMLCh* srcPtr = srcData;
- const XMLCh* endPtr = (srcPtr + countToDo);
- XMLByte* outPtr = toFill;
- XMLByte nextOut;
- while (srcPtr < endPtr)
- {
- //
- // Get the next src char out to a temp, then do a binary search
- // of the 'to' table for this entry.
- //
- if ((nextOut = xlatOneTo(*srcPtr)))
- {
- *outPtr++ = nextOut;
- srcPtr++;
- continue;
- }
- //
- // Its not representable so, according to the options, either
- // throw or use the replacement.
- //
- if (options == UnRep_Throw)
- {
- XMLCh tmpBuf[16];
- XMLString::binToText((unsigned int)*srcPtr, tmpBuf, 16, 16);
- ThrowXML2
- (
- TranscodingException
- , XMLExcepts::Trans_Unrepresentable
- , tmpBuf
- , getEncodingName()
- );
- }
- // Eat the source char and use the replacement char
- srcPtr++;
- *outPtr++ = 0x3F;
- }
- // Set the chars eaten
- charsEaten = countToDo;
- // Return the bytes we transcoded
- return countToDo;
- }
- bool XML256TableTranscoder::canTranscodeTo(const unsigned int toCheck) const
- {
- return (xlatOneTo(toCheck) != 0);
- }
- // ---------------------------------------------------------------------------
- // XML256TableTranscoder: Hidden constructor
- // ---------------------------------------------------------------------------
- XML256TableTranscoder::
- XML256TableTranscoder( const XMLCh* const encodingName
- , const unsigned int blockSize
- , const XMLCh* const fromTable
- , const XMLTransService::TransRec* const toTable
- , const unsigned int toTableSize) :
- XMLTranscoder(encodingName, blockSize)
- , fFromTable(fromTable)
- , fToSize(toTableSize)
- , fToTable(toTable)
- {
- }
- // ---------------------------------------------------------------------------
- // XML256TableTranscoder: Private helper methods
- // ---------------------------------------------------------------------------
- XMLByte XML256TableTranscoder::xlatOneTo(const XMLCh toXlat) const
- {
- unsigned int lowOfs = 0;
- unsigned int hiOfs = fToSize - 1;
- XMLByte curByte = 0;
- do
- {
- // Calc the mid point of the low and high offset.
- const unsigned int midOfs = ((hiOfs - lowOfs) / 2) + lowOfs;
- //
- // If our test char is greater than the mid point char, then
- // we move up to the upper half. Else we move to the lower
- // half. If its equal, then its our guy.
- //
- if (toXlat > fToTable[midOfs].intCh)
- {
- lowOfs = midOfs;
- }
- else if (toXlat < fToTable[midOfs].intCh)
- {
- hiOfs = midOfs;
- }
- else
- {
- return fToTable[midOfs].extCh;
- }
- } while (lowOfs + 1 < hiOfs);
- // Check the high end of the range otherwise the
- // last item in the table may never be found.
- if (toXlat == fToTable[hiOfs].intCh)
- {
- return fToTable[hiOfs].extCh;
- }
- return 0;
- }