cygwintransservice.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 1,173 行 · 第 1/3 页

        // Make sure a whol char is in the source
        if (inPtr + toEat > inEnd)
            break;

        // Try to translate this next char and check for an error
        const unsigned int converted = ::MultiByteToWideChar
        (
            fWinCP
            , MB_PRECOMPOSED | MB_ERR_INVALID_CHARS
            , (const char*)inPtr
            , toEat
            , (LPWSTR)outPtr
            , 1
        );

        if (converted != 1)
        {
            if (toEat == 1)
            {
                XMLCh tmpBuf[17];
                XMLString::binToText((unsigned int)(*inPtr), tmpBuf, 16, 16, getMemoryManager());
                ThrowXMLwithMemMgr2
                (
                    TranscodingException
                    , XMLExcepts::Trans_BadSrcCP
                    , tmpBuf
                    , getEncodingName()
                    , getMemoryManager()
                );
            }
            else
            {
                ThrowXMLwithMemMgr(TranscodingException, XMLExcepts::Trans_BadSrcSeq, getMemoryManager());
            }
        }

        // Update the char sizes array for this round
        *sizesPtr++ = toEat;

        // And update the bytes eaten count
        bytesEaten += toEat;

        // And update our in/out ptrs
        inPtr += toEat;
        outPtr++;
    }

    // Return the chars we output
    return (outPtr - toFill);
}


unsigned int
CygwinTranscoder::transcodeTo(const  XMLCh* const   srcData
                            , const unsigned int    srcCount
                            ,       XMLByte* const  toFill
                            , const unsigned int    maxBytes
                            ,       unsigned int&   charsEaten
                            , const UnRepOpts       options)
{
    // Get pointers to the start and end of each buffer
    const XMLCh*    srcPtr = srcData;
    const XMLCh*    srcEnd = srcData + srcCount;
    XMLByte*        outPtr = toFill;
    XMLByte*        outEnd = toFill + maxBytes;

    //
    //  Now loop until we either get our max chars, or cannot get a whole
    //  character from the input buffer.
    //
    //  NOTE: We have to use a loop for this unfortunately because the
    //  conversion API is too dumb to tell us how many chars it converted if
    //  it couldn't do the whole source.
    //
    BOOL usedDef;
    while ((outPtr < outEnd) && (srcPtr < srcEnd))
    {
        //
        //  Do one char and see if it made it.
        const unsigned int bytesStored = ::WideCharToMultiByte
        (
            fWinCP
            , WC_COMPOSITECHECK | WC_SEPCHARS
            , (LPCWSTR)srcPtr
            , 1
            , (char*)outPtr
            , outEnd - outPtr
            , 0
            , &usedDef
        );

        // If we didn't transcode anything, then we are done
        if (!bytesStored)
            break;

        //
        //  If the defaault char was used and the options indicate that
        //  this isn't allowed, then throw.
        //
        if (usedDef && (options == UnRep_Throw))
        {
            XMLCh tmpBuf[17];
            XMLString::binToText((unsigned int)*srcPtr, tmpBuf, 16, 16, getMemoryManager());
            ThrowXMLwithMemMgr2
            (
                TranscodingException
                , XMLExcepts::Trans_Unrepresentable
                , tmpBuf
                , getEncodingName()
                , getMemoryManager()
            );
        }

        // Update our pointers
        outPtr += bytesStored;
        srcPtr++;
    }

    // Update the chars eaten
    charsEaten = srcPtr - srcData;

    // And return the bytes we stored
    return outPtr - toFill;
}


bool CygwinTranscoder::canTranscodeTo(const unsigned int toCheck) const
{
    //
    //  If the passed value is really a surrogate embedded together, then
    //  we need to break it out into its two chars. Else just one.
    //
    XMLCh           srcBuf[2];
    unsigned int    srcCount = 1;
    if (toCheck & 0xFFFF0000)
    {
        srcBuf[0] = XMLCh((toCheck >> 10) + 0xD800);
        srcBuf[1] = XMLCh(toCheck & 0x3FF) + 0xDC00;
        srcCount++;
    }
    else
    {
        srcBuf[0] = XMLCh(toCheck);
    }

    //
    //  Use a local temp buffer that would hold any sane multi-byte char
    //  sequence and try to transcode this guy into it.
    //
    char tmpBuf[64];

    BOOL usedDef;
    const unsigned int bytesStored = ::WideCharToMultiByte
    (
        fWinCP
        , WC_COMPOSITECHECK | WC_SEPCHARS
        , (LPCWSTR)srcBuf
        , srcCount
        , tmpBuf
        , 64
        , 0
        , &usedDef
    );

    if (!bytesStored || usedDef)
        return false;

    return true;
}




//---------------------------------------------------------------------------
//
//  class CygwinTranscoder Implementation ...
//
//---------------------------------------------------------------------------

// ---------------------------------------------------------------------------
//  CygwinLCPTranscoder: Constructors and Destructor
// ---------------------------------------------------------------------------
CygwinLCPTranscoder::CygwinLCPTranscoder()
{
}

CygwinLCPTranscoder::~CygwinLCPTranscoder()
{
}


// ---------------------------------------------------------------------------
//  CygwinLCPTranscoder: Implementation of the virtual transcoder interface
// ---------------------------------------------------------------------------
unsigned int CygwinLCPTranscoder::calcRequiredSize(const char* const srcText
                                                   , MemoryManager* const manager)
{
    if (!srcText)
        return 0;

    return ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, srcText, -1, NULL, 0);
}


unsigned int CygwinLCPTranscoder::calcRequiredSize(const XMLCh* const srcText
                                                   , MemoryManager* const manager)
{
    if (!srcText)
        return 0;

    return ::WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)srcText, -1, NULL, 0, NULL, NULL);
}


char* CygwinLCPTranscoder::transcode(const XMLCh* const toTranscode)
{
    if (!toTranscode)
        return 0;

    char* retVal = 0;
    if (*toTranscode)
    {
        // Calc the needed size
        const unsigned int neededLen = ::WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)toTranscode, -1, NULL, 0, NULL, NULL);
        if (neededLen == 0)
            return 0;

        // Allocate a buffer of that size plus one for the null and transcode
        // Returned length of WideCharToMultiByte includes terminating NUL.
        retVal = new char[neededLen+1];
        ::WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)toTranscode, -1, retVal, neededLen+1, NULL, NULL);

        // And cap it off anyway just to make sure
        retVal[neededLen] = 0;
    }
    else
    {
        retVal = new char[1];
        retVal[0] = 0;
    }
    return retVal;
}

char* CygwinLCPTranscoder::transcode(const XMLCh* const toTranscode,
                                     MemoryManager* const manager)
{
    if (!toTranscode)
        return 0;

    char* retVal = 0;
    if (*toTranscode)
    {
        // Calc the needed size
        const unsigned int neededLen = ::WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)toTranscode, -1, NULL, 0, NULL, NULL);
        if (neededLen == 0)
            return 0;

        // Allocate a buffer of that size plus one for the null and transcode
        // Returned length of WideCharToMultiByte includes terminating NUL.
        retVal = (char*) manager->allocate((neededLen+1) * sizeof(char)); //new char[neededLen+1];
        ::WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)toTranscode, -1, retVal, neededLen+1, NULL, NULL);

        // And cap it off anyway just to make sure
        retVal[neededLen] = 0;
    }
    else
    {
        retVal = (char*) manager->allocate(sizeof(char)); //new char[1];
        retVal[0] = 0;
    }
    return retVal;
}


XMLCh* CygwinLCPTranscoder::transcode(const char* const toTranscode)
{
    if (!toTranscode)
        return 0;

    XMLCh* retVal = 0;
    if (*toTranscode)
    {
        // Calculate the buffer size required
        const unsigned int neededLen = ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, toTranscode, -1, NULL, 0);
        if (neededLen == 0)
            return 0;

        // Allocate a buffer of that size plus one for the null and transcode
        retVal = new XMLCh[neededLen + 1];
        ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, toTranscode, -1, (LPWSTR)retVal, neededLen + 1);

        // Cap it off just to make sure. We are so paranoid!
        retVal[neededLen] = 0;
    }
    else
    {
        retVal = new XMLCh[1];
        retVal[0] = 0;
    }
    return retVal;
}

XMLCh* CygwinLCPTranscoder::transcode(const char* const toTranscode,
                                      MemoryManager* const manager)
{
    if (!toTranscode)
        return 0;

    XMLCh* retVal = 0;
    if (*toTranscode)
    {
        // Calculate the buffer size required
        const unsigned int neededLen = ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, toTranscode, -1, NULL, 0);
        if (neededLen == 0)
            return 0;

        // Allocate a buffer of that size plus one for the null and transcode
        retVal = (XMLCh*) manager->allocate((neededLen + 1) * sizeof(XMLCh)); //new XMLCh[neededLen + 1];
        ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, toTranscode, -1, (LPWSTR)retVal, neededLen + 1);

        // Cap it off just to make sure. We are so paranoid!
        retVal[neededLen] = 0;
    }
    else
    {
        retVal = (XMLCh*) manager->allocate(sizeof(XMLCh)); //new XMLCh[1];
        retVal[0] = 0;
    }
    return retVal;
}


bool CygwinLCPTranscoder::transcode( const   char* const    toTranscode
                                    ,       XMLCh* const    toFill
                                    , const unsigned int    maxChars
                                    , MemoryManager* const  manager)
{
    // Check for a couple of psycho corner cases
    if (!toTranscode || !maxChars)
    {
        toFill[0] = 0;
        return true;
    }

    if (!*toTranscode)
    {
        toFill[0] = 0;
        return true;
    }

    // This one has a fixed size output, so try it and if it fails it fails
    if ( 0 == ::MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, toTranscode, -1, (LPWSTR)toFill, maxChars + 1) )
        return false;
    return true;
}


bool CygwinLCPTranscoder::transcode( const  XMLCh* const    toTranscode
                                    ,       char* const     toFill
                                    , const unsigned int    maxBytes
                                    , MemoryManager* const  manager)
{
    // Watch for a couple of pyscho corner cases
    if (!toTranscode || !maxBytes)
    {
        toFill[0] = 0;
        return true;
    }

    if (!*toTranscode)
    {
        toFill[0] = 0;
        return true;
    }

    // This one has a fixed size output, so try it and if it fails it fails
    if ( 0 == ::WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)toTranscode, -1, toFill, maxBytes + 1, NULL, NULL) )
        return false;

    // Cap it off just in case
    toFill[maxBytes] = 0;
    return true;
}


XERCES_CPP_NAMESPACE_END