xmlstring.cpp

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/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * $Id: XMLString.cpp,v 1.37 2004/09/28 09:35:05 amassari Exp $
 */


// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>

#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/ArrayIndexOutOfBoundsException.hpp>
#include <xercesc/util/IllegalArgumentException.hpp>
#include <xercesc/util/NumberFormatException.hpp>
#include <xercesc/util/OutOfMemoryException.hpp>
#include <xercesc/util/RuntimeException.hpp>
#include <xercesc/util/TranscodingException.hpp>

#include <xercesc/util/Janitor.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/RefArrayVectorOf.hpp>
#include <xercesc/util/TransService.hpp>
#include <xercesc/util/XMLUniDefs.hpp>
#include <xercesc/util/XMLUni.hpp>
#include <xercesc/util/XMLUri.hpp>
#include <xercesc/internal/XMLReader.hpp>

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  Local static data
//
//  gConverter
//      This is initialized when the user calls the platform init method,
//      which calls our init method. This is the converter used for default
//      conversion to/from the local code page.
// ---------------------------------------------------------------------------
static XMLLCPTranscoder*    gTranscoder = 0;
static XMLCh                gNullStr[] =
{
    chOpenCurly, chLatin_n, chLatin_u, chLatin_l, chLatin_l, chCloseCurly, chNull
};

MemoryManager* XMLString::fgMemoryManager = 0;


// ---------------------------------------------------------------------------
//  XMLString: Public static methods
// ---------------------------------------------------------------------------
void XMLString::binToText(  const   unsigned long   toFormat
                            ,       char* const     toFill
                            , const unsigned int    maxChars
                            , const unsigned int    radix
                            , MemoryManager* const  manager)
{
    static const char digitList[16] =
    {
          '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
        , 'A', 'B', 'C', 'D', 'E', 'F'
    };

    if (!maxChars)
        ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::Str_ZeroSizedTargetBuf, manager);

    // Handle special case
    if (!toFormat)
    {
        toFill[0] = '0';
        toFill[1] = 0;
        return;
    }

    // This is used to fill the temp buffer
    unsigned int tmpIndex = 0;

    // A copy of the conversion value that we can modify
    unsigned int tmpVal = toFormat;

    //
    //  Convert into a temp buffer that we know is large enough. This avoids
    //  having to check for overflow in the inner loops, and we have to flip
    //  the resulting XMLString anyway.
    //
    char   tmpBuf[128];

    //
    //  For each radix, do the optimal thing. For bin and hex, we can special
    //  case them and do shift and mask oriented stuff. For oct and decimal
    //  there isn't much to do but bull through it with divides.
    //
    if (radix == 2)
    {
        while (tmpVal)
        {
            if (tmpVal & 0x1UL)
                tmpBuf[tmpIndex++] = '1';
            else
                tmpBuf[tmpIndex++] = '0';
            tmpVal >>= 1;
        }
    }
     else if (radix == 16)
    {
        while (tmpVal)
        {
            const unsigned int charInd = (tmpVal & 0xFUL);
            tmpBuf[tmpIndex++] = digitList[charInd];
            tmpVal >>= 4;
        }
    }
     else if ((radix == 8) || (radix == 10))
    {
        while (tmpVal)
        {
            const unsigned int charInd = (tmpVal % radix);
            tmpBuf[tmpIndex++] = digitList[charInd];
            tmpVal /= radix;
        }
    }
    else
    {
        ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::Str_UnknownRadix, manager);
    }

    // See if have enough room in the caller's buffer
    if (tmpIndex > maxChars)
    {
        ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::Str_TargetBufTooSmall, manager);
    }

    // Reverse the tmp buffer into the caller's buffer
    unsigned int outIndex = 0;
    for (; tmpIndex > 0; tmpIndex--)
        toFill[outIndex++] = tmpBuf[tmpIndex-1];

    // And cap off the caller's buffer
    toFill[outIndex] = char(0);
}

void XMLString::binToText(  const   unsigned int    toFormat
                            ,       char* const     toFill
                            , const unsigned int    maxChars
                            , const unsigned int    radix
                            , MemoryManager* const  manager)
{
    // Just call the unsigned long version
    binToText((unsigned long)toFormat, toFill, maxChars, radix, manager);
}

void XMLString::binToText(  const   long            toFormat
                            ,       char* const     toFill
                            , const unsigned int    maxChars
                            , const unsigned int    radix
                            , MemoryManager* const  manager)
{
    //
    //  If its negative, then put a negative sign into the output and flip
    //  the sign of the local temp value.
    //
    unsigned int startInd = 0;
    unsigned long actualVal;
    if (toFormat < 0)
    {
        toFill[0] = '-';
        startInd++;
        actualVal = (unsigned long)(toFormat * -1);
    }
     else
    {
        actualVal = (unsigned long)(toFormat);
    }

    // And now call the unsigned long version
    binToText(actualVal, &toFill[startInd], maxChars, radix, manager);
}

void XMLString::binToText(  const   int             toFormat
                            ,       char* const     toFill
                            , const unsigned int    maxChars
                            , const unsigned int    radix
                            , MemoryManager* const  manager)
{
    //
    //  If its negative, then put a negative sign into the output and flip
    //  the sign of the local temp value.
    //
    unsigned int startInd = 0;
    unsigned long actualVal;
    if (toFormat < 0)
    {
        toFill[0] = '-';
        startInd++;
        actualVal = (unsigned long)(toFormat * -1);
    }
     else
    {
        actualVal = (unsigned long)(toFormat);
    }

    // And now call the unsigned long version
    binToText(actualVal, &toFill[startInd], maxChars, radix, manager);
}


void XMLString::catString(char* const target, const char* const src)
{
    strcat(target, src);
}


int XMLString::compareIString(const char* const str1, const char* const str2)
{
    return stricmp(str1, str2);
}


int XMLString::compareNString(  const   char* const     str1
                                , const char* const     str2
                                , const unsigned int    count)
{
    // Watch for pathological secenario
    if (!count)
        return 0;

    return strncmp(str1, str2, count);
}


int XMLString::compareNIString( const   char* const     str1
                                , const char* const     str2
                                , const unsigned int    count)
{
    if (!count)
        return 0;

    return strnicmp(str1, str2, count);
}


int XMLString::compareString(   const   char* const    str1
                                , const char* const    str2)
{
    return strcmp(str1, str2);
}


void XMLString::copyString(         char* const    target
                            , const char* const    src)
{
    strcpy(target, src);
}


void XMLString::cut(        XMLCh* const    toCutFrom
                    , const unsigned int    count)
{
    #if defined(XML_DEBUG)
    if (count > stringLen(toCutFrom))
    {
        // <TBD> This is bad of course
    }
    #endif

    // If count is zero, then nothing to do
    if (!count)
        return;

    XMLCh* targetPtr = toCutFrom;
    XMLCh* srcPtr = toCutFrom + count;
    while (*srcPtr)
        *targetPtr++ = *srcPtr++;

    // Cap it off at the new end
    *targetPtr = 0;
}


unsigned int XMLString::hash(   const   char* const     tohash
                                , const unsigned int    hashModulus
                                , MemoryManager* const  manager)
{    
    if (!hashModulus)
        ThrowXMLwithMemMgr(IllegalArgumentException, XMLExcepts::Pool_ZeroModulus, manager);

    unsigned int hashVal = 0;
    if (tohash) {
        const char* curCh = tohash;
        while (*curCh)
        {
            unsigned int top = hashVal >> 24;
            hashVal += (hashVal * 37) + top + (unsigned int)(*curCh);
            curCh++;
        }
    }

    // Divide by modulus
    return hashVal % hashModulus;
}


int XMLString::indexOf(const char* const toSearch, const char ch)
{
    const unsigned int len = strlen(toSearch);
    for (unsigned int i = 0; i < len; i++)
    {
        if (toSearch[i] == ch)
            return i;
    }
    return -1;
}


int XMLString::indexOf( const   char* const     toSearch
                        , const char            ch
                        , const unsigned int    fromIndex
                        , MemoryManager* const  manager)
{
    const unsigned int len = strlen(toSearch);

    // Make sure the start index is within the XMLString bounds
	if ((int)fromIndex > ((int)len)-1)
        ThrowXMLwithMemMgr(ArrayIndexOutOfBoundsException, XMLExcepts::Str_StartIndexPastEnd, manager);

    for (unsigned int i = fromIndex; i < len; i++)
    {
        if (toSearch[i] == ch)
            return i;
    }
    return -1;
}

int XMLString::lastIndexOf(const char* const toSearch, const char ch)
{
    const int len = strlen(toSearch);
    for (int i = len-1; i >= 0; i--)
    {
        if (toSearch[i] == ch)
            return i;
    }
    return -1;
}

int XMLString::lastIndexOf( const   char* const     toSearch
                            , const char            ch
                            , const unsigned int    fromIndex
                            , MemoryManager* const  manager)
{
    const int len = strlen(toSearch);

    // Make sure the start index is within the XMLString bounds
	if ((int)fromIndex > len-1)
        ThrowXMLwithMemMgr(ArrayIndexOutOfBoundsException, XMLExcepts::Str_StartIndexPastEnd, manager);

    for (int i = (int)fromIndex; i >= 0; i--)
    {
        if (toSearch[i] == ch)
            return i;
    }
    return -1;
}


unsigned int XMLString::replaceTokens(          XMLCh* const    errText
                                        , const unsigned int    maxChars
                                        , const XMLCh* const    text1
                                        , const XMLCh* const    text2
                                        , const XMLCh* const    text3
                                        , const XMLCh* const    text4
                                        , MemoryManager* const  manager)
{
    //
    //  We have to build the string back into the source string, so allocate
    //  a temp string and copy the orignal text to it. We'll then treat the
    //  incoming buffer as a target buffer. Put a janitor on it to make sure
    //  it gets cleaned up.
    //
    XMLCh* orgText = replicate(errText, manager);
    ArrayJanitor<XMLCh> janText(orgText, manager);

    XMLCh* pszSrc = orgText;
    unsigned int curOutInd = 0;

    while (*pszSrc && (curOutInd < maxChars))
    {
        //
        //  Loop until we see a { character. Until we do, just copy chars
        //  from src to target, being sure not to overrun the output buffer.
        //
        while ((*pszSrc != chOpenCurly) && (curOutInd < maxChars))
        {
            if (!*pszSrc)
                break;
            errText[curOutInd++] = *pszSrc++;
        }

        // If we did not find a curly, then we are done
        if (*pszSrc != chOpenCurly)
            break;

        //
        //  Probe this one to see if it matches our pattern of {x}. If not
        //  then copy over those chars and go back to the first loop.
        //
        if ((*(pszSrc+1) >= chDigit_0)
        &&  (*(pszSrc+1) <= chDigit_3)
        &&  (*(pszSrc+2) == chCloseCurly))
        {
            //
            //  Its one of our guys, so move the source pointer up past the
            //  token we are replacing. First though get out the token number
            //  character.
            //
            XMLCh tokCh = *(pszSrc+1);
            pszSrc += 3;

            // Now copy over the replacement text
            const XMLCh* repText = 0;
            if (tokCh == chDigit_0)
                repText = text1;
            else if (tokCh == chDigit_1)
                repText = text2;
            else if (tokCh == chDigit_2)
                repText = text3;
            else if (tokCh == chDigit_3)
                repText = text4;

            // If this one is null, copy over a null string
            if (!repText)
                repText = gNullStr;

            while (*repText && (curOutInd < maxChars))
                errText[curOutInd++] = *repText++;
        }
         else
        {
            // Escape the curly brace character and continue
            errText[curOutInd++] = *pszSrc++;
        }
    }

    // Copy over a null terminator
    errText[curOutInd] = 0;

    // And return the count of chars we output
    return curOutInd;
}


XMLCh* XMLString::replicate(const XMLCh* const toRep)
{
    // If a null string, return a null string!
    XMLCh* ret = 0;
    if (toRep)
    {
        const unsigned int len = stringLen(toRep);
        ret = new XMLCh[len + 1];
        memcpy(ret, toRep, (len + 1) * sizeof(XMLCh));
    }