xmlreader.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 1,501 行 · 第 1/4 页

/*
 * 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: XMLReader.cpp,v 1.25 2004/09/29 00:24:01 knoaman Exp $
 */

// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/internal/XMLReader.hpp>
#include <xercesc/util/BitOps.hpp>
#include <xercesc/util/BinInputStream.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/RuntimeException.hpp>
#include <xercesc/util/TransService.hpp>
#include <xercesc/util/XMLEBCDICTranscoder.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/Janitor.hpp>

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  XMLReader: Query Methods
// ---------------------------------------------------------------------------
//  Checks whether all of the chars in the passed buffer are whitespace or
//  not. Breaks out on the first non-whitespace.
//
bool XMLReader::isAllSpaces(const   XMLCh* const    toCheck
                            , const unsigned int    count)
{
    const XMLCh* curCh = toCheck;
    const XMLCh* endPtr = toCheck + count;
    while (curCh < endPtr)
    {
        if (!(fgCharCharsTable[*curCh++] & gWhitespaceCharMask))
            return false;
    }
    return true;
}


//
//  Checks whether at least one of the chars in the passed buffer are whitespace or
//  not.
//
bool XMLReader::containsWhiteSpace(const   XMLCh* const    toCheck
                            , const unsigned int    count)
{
    const XMLCh* curCh = toCheck;
    const XMLCh* endPtr = toCheck + count;
    while (curCh < endPtr)
    {
        if (fgCharCharsTable[*curCh++] & gWhitespaceCharMask)
            return true;
    }
    return false;
}

//
//  This one is not called terribly often, so call the XMLChar utility
//
bool XMLReader::isPublicIdChar(const XMLCh toCheck)
{
    if (fXMLVersion == XMLV1_1)
        return XMLChar1_1::isPublicIdChar(toCheck);
    else
        return XMLChar1_0::isPublicIdChar(toCheck);
}

// ---------------------------------------------------------------------------
//  XMLReader: Constructors and Destructor
// ---------------------------------------------------------------------------
XMLReader::XMLReader(const  XMLCh* const          pubId
                    , const XMLCh* const          sysId
                    ,       BinInputStream* const streamToAdopt
                    , const RefFrom               from
                    , const Types                 type
                    , const Sources               source
                    , const bool                  throwAtEnd
                    , const bool                  calculateSrcOfs
                    , const XMLVersion            version
                    ,       MemoryManager* const  manager) :
    fCharIndex(0)
    , fCharsAvail(0)
    , fCurCol(1)
    , fCurLine(1)
    , fEncodingStr(0)
    , fForcedEncoding(false)
    , fNoMore(false)
    , fPublicId(XMLString::replicate(pubId, manager))
    , fRawBufIndex(0)
    , fRawBytesAvail(0)
    , fReaderNum(0xFFFFFFFF)
    , fRefFrom(from)
    , fSentTrailingSpace(false)
    , fSource(source)
    , fSrcOfsBase(0)
    , fSrcOfsSupported(false)
    , fCalculateSrcOfs(calculateSrcOfs)    
    , fSystemId(XMLString::replicate(sysId, manager))
    , fStream(streamToAdopt)
    , fSwapped(false)
    , fThrowAtEnd(throwAtEnd)
    , fTranscoder(0)
    , fType(type)
    , fMemoryManager(manager)
{
    setXMLVersion(version);

    // Do an initial load of raw bytes
    refreshRawBuffer();

    // Ask the transcoding service if it supports src offset info
    fSrcOfsSupported = XMLPlatformUtils::fgTransService->supportsSrcOfs();

    //
    //  Use the recognizer class to get a basic sense of what family of
    //  encodings this file is in. We'll start off with a reader of that
    //  type, and update it later if needed when we read the XMLDecl line.
    //
    fEncoding = XMLRecognizer::basicEncodingProbe(fRawByteBuf, fRawBytesAvail);

    #if defined(XERCES_DEBUG)
    if ((fEncoding < XMLRecognizer::Encodings_Min)
    ||  (fEncoding > XMLRecognizer::Encodings_Max))
    {
        ThrowXMLwithMemMgr(RuntimeException, XMLExcepts::Reader_BadAutoEncoding, fMemoryManager);
    }
    #endif

    fEncodingStr = XMLString::replicate(XMLRecognizer::nameForEncoding(fEncoding, fMemoryManager), fMemoryManager);

    // Check whether the fSwapped flag should be set or not
    checkForSwapped();

    //
    //  This will check to see if the first line is an XMLDecl and, if
    //  so, decode that first line manually one character at a time. This
    //  leaves enough characters in the buffer that the high level code
    //  can get through the Decl and call us back with the real encoding.
    //
    doInitDecode();

    //
    //  NOTE: We won't create a transcoder until we either get a call to
    //  setEncoding() or we get a call to refreshCharBuffer() and no
    //  transcoder has been set yet.
    //
}


XMLReader::XMLReader(const  XMLCh* const          pubId
                    , const XMLCh* const          sysId
                    ,       BinInputStream* const streamToAdopt
                    , const XMLCh* const          encodingStr
                    , const RefFrom               from
                    , const Types                 type
                    , const Sources               source
                    , const bool                  throwAtEnd
                    , const bool                  calculateSrcOfs
                    , const XMLVersion            version
                    ,       MemoryManager* const  manager) :
    fCharIndex(0)
    , fCharsAvail(0)
    , fCurCol(1)
    , fCurLine(1)
    , fEncoding(XMLRecognizer::UTF_8)
    , fEncodingStr(0)
    , fForcedEncoding(true)
    , fNoMore(false)
    , fPublicId(XMLString::replicate(pubId, manager))
    , fRawBufIndex(0)
    , fRawBytesAvail(0)
    , fReaderNum(0xFFFFFFFF)
    , fRefFrom(from)
    , fSentTrailingSpace(false)
    , fSource(source)
    , fSrcOfsBase(0)
    , fSrcOfsSupported(false)
    , fCalculateSrcOfs(calculateSrcOfs)    
    , fSystemId(XMLString::replicate(sysId, manager))
    , fStream(streamToAdopt)
    , fSwapped(false)
    , fThrowAtEnd(throwAtEnd)
    , fTranscoder(0)
    , fType(type)
    , fMemoryManager(manager)
{
    setXMLVersion(version);

    // Do an initial load of raw bytes
    refreshRawBuffer();

    // Copy the encoding string to our member
    fEncodingStr = XMLString::replicate(encodingStr, fMemoryManager);
    XMLString::upperCase(fEncodingStr);

    // Ask the transcoding service if it supports src offset info
    fSrcOfsSupported = XMLPlatformUtils::fgTransService->supportsSrcOfs();

    //
    //  Map the passed encoding name to one of our enums. If it does not
    //  match one of the intrinsic encodings, it will come back 'other',
    //  which tells us to create a transcoder based reader.
    //
    fEncoding = XMLRecognizer::encodingForName(fEncodingStr);

    // Check whether the fSwapped flag should be set or not
    checkForSwapped();

    //
    //  Create a transcoder for the encoding. Since the encoding has been
    //  forced, this will be the one we will use, period.
    //
    XMLTransService::Codes failReason;
    if (fEncoding == XMLRecognizer::OtherEncoding)
    {
        //
        //  fEncodingStr not  pre-recognized, use it
        //  directly for transcoder
        //
        fTranscoder = XMLPlatformUtils::fgTransService->makeNewTranscoderFor
        (
            fEncodingStr
            , failReason
            , kCharBufSize
            , fMemoryManager
        );
    }
     else
    {
        //
        //  Use the recognized fEncoding to create the transcoder
        //
        fTranscoder = XMLPlatformUtils::fgTransService->makeNewTranscoderFor
        (
            fEncoding
            , failReason
            , kCharBufSize
            , fMemoryManager
        );

    }

    if (!fTranscoder)
    {
        ThrowXMLwithMemMgr1
        (
            TranscodingException
            , XMLExcepts::Trans_CantCreateCvtrFor
            , fEncodingStr
            , fMemoryManager
        );
    }

    //
    //  Note that, unlike above, we do not do an initial decode of the
    //  first line. We take the caller's word that the encoding is correct
    //  and just assume that the first bulk decode (kicked off by the first
    //  get of a character) will work.
    //
    //  So we do here the slipping in of the leading space if required.
    //
    if ((fType == Type_PE) && (fRefFrom == RefFrom_NonLiteral))
    {
        // This represents no data from the source
        fCharSizeBuf[fCharsAvail] = 0;
        fCharOfsBuf[fCharsAvail] = 0;
        fCharBuf[fCharsAvail++] = chSpace;
    }
}


XMLReader::XMLReader(const  XMLCh* const          pubId
                    , const XMLCh* const          sysId
                    ,       BinInputStream* const streamToAdopt
                    , XMLRecognizer::Encodings    encodingEnum
                    , const RefFrom               from
                    , const Types                 type
                    , const Sources               source
                    , const bool                  throwAtEnd
                    , const bool                  calculateSrcOfs
                    , const XMLVersion            version
                    ,       MemoryManager* const  manager) :
    fCharIndex(0)
    , fCharsAvail(0)
    , fCurCol(1)
    , fCurLine(1)
    , fEncoding(XMLRecognizer::UTF_8)
    , fEncodingStr(0)
    , fForcedEncoding(true)
    , fNoMore(false)
    , fPublicId(XMLString::replicate(pubId, manager))
    , fRawBufIndex(0)
    , fRawBytesAvail(0)
    , fReaderNum(0xFFFFFFFF)
    , fRefFrom(from)
    , fSentTrailingSpace(false)
    , fSource(source)
    , fSrcOfsBase(0)
    , fSrcOfsSupported(false)
    , fCalculateSrcOfs(calculateSrcOfs)    
    , fSystemId(XMLString::replicate(sysId, manager))
    , fStream(streamToAdopt)
    , fSwapped(false)
    , fThrowAtEnd(throwAtEnd)
    , fTranscoder(0)
    , fType(type)
    , fMemoryManager(manager)
{
    setXMLVersion(version);

    // Do an initial load of raw bytes
    refreshRawBuffer();

    // Ask the transcoding service if it supports src offset info
    fSrcOfsSupported = XMLPlatformUtils::fgTransService->supportsSrcOfs();

    //
    //  Use the passed encoding code
    //
    fEncoding = encodingEnum;
    fEncodingStr = XMLString::replicate(XMLRecognizer::nameForEncoding(fEncoding, fMemoryManager), fMemoryManager);

    // Check whether the fSwapped flag should be set or not
    checkForSwapped();

    //
    //  Create a transcoder for the encoding. Since the encoding has been
    //  forced, this will be the one we will use, period.
    //
    XMLTransService::Codes failReason;
    fTranscoder = XMLPlatformUtils::fgTransService->makeNewTranscoderFor
    (
        fEncoding
        , failReason
        , kCharBufSize
        , fMemoryManager
    );

    if (!fTranscoder)
    {
        ThrowXMLwithMemMgr1
        (
            TranscodingException
            , XMLExcepts::Trans_CantCreateCvtrFor
            , fEncodingStr
            , fMemoryManager
        );
    }

    //
    //  Note that, unlike above, we do not do an initial decode of the
    //  first line. We take the caller's word that the encoding is correct
    //  and just assume that the first bulk decode (kicked off by the first
    //  get of a character) will work.
    //
    //  So we do here the slipping in of the leading space if required.
    //
    if ((fType == Type_PE) && (fRefFrom == RefFrom_NonLiteral))
    {
        // This represents no data from the source