ICUTransService.cpp

/*
 * 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
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 * 5. Products derived from this software may not be called "Apache",
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * 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/>.
 */

/*
 * $Id$
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/util/Janitor.hpp>
#include <xercesc/util/TranscodingException.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/XMLUniDefs.hpp>
#include "ICUTransService.hpp"
#include <string.h>
#include <unicode/uloc.h>
#include <unicode/unicode.h>
#include <unicode/ucnv.h>
#include <unicode/ucnv_err.h>
#include <unicode/ustring.h>
#include <unicode/udata.h>


#if !defined(XML_OS390) && !defined(XML_AS400) && !defined(XML_HPUX) && !defined(XML_PTX)
// Forward reference the symbol which points to the ICU converter data.
#if (U_ICU_VERSION_MAJOR_NUM < 2)
extern "C" const uint8_t U_IMPORT icudata_dat[];
#endif
#endif



// ---------------------------------------------------------------------------
//  Local, const data
// ---------------------------------------------------------------------------
static const XMLCh gMyServiceId[] =
{
    chLatin_I, chLatin_C, chLatin_U, chNull
};



// ---------------------------------------------------------------------------
//  Local functions
// ---------------------------------------------------------------------------

//
//  When XMLCh and ICU's UChar are not the same size, we have to do a temp
//  conversion of all strings. These local helper methods make that easier.
//
static UChar* convertToUChar(   const   XMLCh* const    toConvert
                                , const unsigned int    srcLen = 0)
{
    const unsigned int actualLen = srcLen
                                   ? srcLen : XMLString::stringLen(toConvert);

    UChar* tmpBuf = new UChar[actualLen + 1];
    const XMLCh* srcPtr = toConvert;
    UChar* outPtr = tmpBuf;
    while (*srcPtr)
        *outPtr++ = UChar(*srcPtr++);
    *outPtr = 0;

    return tmpBuf;
}


static XMLCh* convertToXMLCh(const UChar* const toConvert)
{
    const unsigned int srcLen = u_strlen(toConvert);
    XMLCh* retBuf = new XMLCh[srcLen + 1];

    XMLCh* outPtr = retBuf;
    const UChar* srcPtr = toConvert;
    while (*srcPtr)
        *outPtr++ = XMLCh(*srcPtr++);
    *outPtr = 0;

    return retBuf;
}




// ---------------------------------------------------------------------------
//  ICUTransService: Constructors and Destructor
// ---------------------------------------------------------------------------
ICUTransService::ICUTransService()
{
#if !defined(XML_OS390) && !defined(XML_AS400) && !defined(XML_HPUX) && !defined(XML_PTX)
#if (U_ICU_VERSION_MAJOR_NUM < 2)
    // Starting with ICU 2.0, ICU itself includes a static reference to the data
    // entrypoint symbol.
    //
    // ICU 1.8 (and previous) did not include a static reference, but would
    // dynamically load the data dll when it was first needed, however this dynamic
    // loading proved unreliable in some of the odd environments that Xerces needed
    // to run in.  Hence, the static reference.

    // Pass the location of the converter data to ICU. By doing so, we are
    // forcing the load of ICU converter data DLL, after the Xerces-C DLL is
    // loaded. This implies that Xerces-C, now has to explicitly link with the
    // ICU converter dll. However, the advantage is that we no longer depend
    // on the code which does demand dynamic loading of DLL's. The demand
    // loading is highly system dependent and was a constant source of support
    // calls.
    UErrorCode uerr = U_ZERO_ERROR;
    udata_setCommonData((void *) icudata_dat, &uerr);
#endif
#endif
}

ICUTransService::~ICUTransService()
{
}


// ---------------------------------------------------------------------------
//  ICUTransService: The virtual transcoding service API
// ---------------------------------------------------------------------------
int ICUTransService::compareIString(const   XMLCh* const    comp1
                                    , const XMLCh* const    comp2)
{
    const XMLCh* psz1 = comp1;
    const XMLCh* psz2 = comp2;

    unsigned int curCount = 0;
    while (true)
    {
        //
        //  If an inequality, then return the difference. Note that the XMLCh
        //  might be bigger physically than UChar, but it won't hold anything
        //  larger than 0xFFFF, so our cast here will work for both possible
        //  sizes of XMLCh.
        //
        if (Unicode::toUpperCase(UChar(*psz1)) != Unicode::toUpperCase(UChar(*psz2)))
            return int(*psz1) - int(*psz2);

        // If either has ended, then they both ended, so equal
        if (!*psz1 || !*psz2)
            break;

        // Move upwards for the next round
        psz1++;
        psz2++;