/*******************************************************************************

;*******************************************************************************

;**                                                                           **

;**                    COPYRIGHT 2004-2011 NUANCE COMMUNICATIONS              **

;**                                                                           **

;**               NUANCE COMMUNICATIONS PROPRIETARY INFORMATION               **

;**                                                                           **

;**     This software is supplied under the terms of a license agreement      **

;**     or non-disclosure agreement with Nuance Communications and may not    **

;**     be copied or disclosed except in accordance with the terms of that    **

;**     agreement.                                                            **

;**                                                                           **

;**                                                                           **

;*******************************************************************************

;**                                                                           **

;**     FileName: et9cpcnvt.c                                                 **

;**                                                                           **

;**  Description: Chinese XT9 simplified-traditional Chinese conversion.      **

;**               Conforming to the development version of Chinese XT9.       **

;**                                                                           **

;*******************************************************************************

;******************************************************************************/



#include "et9cpapi.h"

#include "et9cpsys.h"

#include "et9cpldb.h"



/* Function : UnicodePairBSearch

 * Input    : pET9CPLingInfo = Chinese XT9 LingInfo

 *            dwStartOffset:  table starting offset

 *            wPairCount:     count of the unicode pairs

 *            wUnicode:       Unicode to be found

 * Output   : none

 * Return   : if a pair is found whose first unicode is wUnicode, then return the second unicode of it. Otherwise return wUnicode

 */

static ET9U16 ET9LOCALCALL  UnicodePairBSearch(ET9CPLingInfo * pET9CPLingInfo, ET9U32 dwStartOffset, ET9U16 wPairCount, ET9U16 wUnicode)

{

    ET9INT low, mid, high;

    ET9U16 w, wRet = wUnicode;



    low = 0;

    high = wPairCount - 1;



    while ( low <= high )

    {

        mid = (low + high) / 2;

        w = ET9_CP_LdbReadWord(pET9CPLingInfo, dwStartOffset + mid * 4); /* 2 * sizeof(ET9U16) */

        if (w < wUnicode) {

            low = mid + 1;

        }

        else if (w > wUnicode) {

            high = mid - 1;

        }

        else {

            wRet = ET9_CP_LdbReadWord(pET9CPLingInfo, dwStartOffset + mid * 4 + 2);

            break;  /* Find it */

        }

    }



    return wRet;

}



/** Convert a Unicode string of Simplified Chinese to Traditional Chinese

 *

 *  This function is useful when developing UI to display traditional Chinese strings in text area.

 *

 * @param pET9CPLingInfo     pointer to chinese information structure.

 * @param pUnicodeStr        (in/out) The Unicode string of Simplified Chinese to be converted, On exit, it is the converted Unicode string of Traditional Chinese

 * @param wStrLen            The number of Unicode characters in pUnicodeStr

 *

 * @return ET9STATUS_NONE               Succeeded

 * @return ET9STATUS_NO_INIT            pET9CPLingInfo is not properly initialized

 * @return ET9STATUS_BAD_PARAM          pUnicodeStr is NULL

 */

ET9STATUS ET9FARCALL ET9CPSimplifiedToTraditional(ET9CPLingInfo *pET9CPLingInfo,

                                                  ET9SYMB * pUnicodeStr,

                                                  ET9U16    wStrLen)

{

    ET9U16 i;

    ET9_CP_ConversionTable * pConvTable;



    ET9_CP_CHECK_LINGINFO(pET9CPLingInfo);

    if (pUnicodeStr == NULL)

        return ET9STATUS_BAD_PARAM;



    pConvTable = &pET9CPLingInfo->ConvTable;

    for (i = 0; i < wStrLen; i++)

    {

        pUnicodeStr[i] = UnicodePairBSearch(pET9CPLingInfo, pConvTable->dwSimpTradOffset, pConvTable->wSimpTradCount, pUnicodeStr[i]);

    }

    return ET9STATUS_NONE;

}



/** Convert a Unicode string of Traditional Chinese to Simplified Chinese

 *

 *  This function is useful when developing UI to display Simplified Chinese strings in text area.

 *

 * @param pET9CPLingInfo     pointer to chinese information structure.

 * @param pUnicodeStr        (in/out) The Unicode string of Traditional Chinese to be converted, On exit, it is the converted Unicode string of Simplified Chinese

 * @param wStrLen            The number of Unicode characters in pUnicodeStr

 *

 * @return ET9STATUS_NONE               Succeeded

 * @return ET9STATUS_NO_INIT            pET9CPLingInfo is not properly initialized

 * @return ET9STATUS_BAD_PARAM          pUnicodeStr is NULL

 */

ET9STATUS ET9FARCALL ET9CPTraditionalToSimplified(ET9CPLingInfo *pET9CPLingInfo,

                                                  ET9SYMB * pUnicodeStr,

                                                  ET9U16    wStrLen)

{

    ET9U16 i;

    ET9_CP_ConversionTable * pConvTable;



    ET9_CP_CHECK_LINGINFO(pET9CPLingInfo);

    if (pUnicodeStr == NULL)

        return ET9STATUS_BAD_PARAM;



    pConvTable = &pET9CPLingInfo->ConvTable;

    for (i = 0; i < wStrLen; i++)

    {

        pUnicodeStr[i] = UnicodePairBSearch(pET9CPLingInfo, pConvTable->dwTradSimpOffset, pConvTable->wTradSimpCount, pUnicodeStr[i]);

    }

    return ET9STATUS_NONE;

}