XMLUtils.cc

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#include <iostream>
#include <memory>
#include <string>
#include <cstring>

#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/XMLUni.hpp>
#include <xercesc/sax2/SAX2XMLReader.hpp>
#include <xercesc/sax2/XMLReaderFactory.hpp>

#include "FWCore/Utilities/interface/Exception.h"

#include "Utilities/StorageFactory/interface/IOTypes.h"
#include "Utilities/StorageFactory/interface/Storage.h"

#include "XMLUtils.h"

XERCES_CPP_NAMESPACE_USE

namespace lhef {

StorageWrap::StorageWrap(Storage *storage) :
    storage(storage)
{
}

StorageWrap::~StorageWrap()
{
    storage->close();
}

unsigned int XMLDocument::XercesPlatform::instances = 0;

XMLDocument::XercesPlatform::XercesPlatform()
{
    if (!instances++) {
        try {
            XMLPlatformUtils::Initialize();
        } catch(const XMLException &e) {
            throw cms::Exception("XMLDocument")
                << "XMLPlatformUtils::Initialize failed "
                   "because of: "
                << XMLSimpleStr(e.getMessage()) << std::endl;
        }
    }
}

XMLDocument::XercesPlatform::~XercesPlatform()
{
    if (!--instances)
        XMLPlatformUtils::Terminate();
}

XMLDocument::XMLDocument(std::auto_ptr<std::istream> &in, Handler &handler) :
    platform(new XercesPlatform()),
    source(new STLInputSource(in)),
    parser(XMLReaderFactory::createXMLReader()),
    done(false)
{
    init(handler);
}

XMLDocument::XMLDocument(std::auto_ptr<StorageWrap> &in, Handler &handler) :
    platform(new XercesPlatform()),
    source(new StorageInputSource(in)),
    parser(XMLReaderFactory::createXMLReader()),
    done(false)
{
    init(handler);
}

void XMLDocument::init(Handler &handler)
{
    try {
        parser->setFeature(XMLUni::fgSAX2CoreValidation, false);
        parser->setFeature(XMLUni::fgSAX2CoreNameSpaces, false);
        parser->setFeature(XMLUni::fgXercesSchema, false);
        parser->setFeature(XMLUni::fgXercesSchemaFullChecking, false);

        parser->setContentHandler(&handler);
        parser->setLexicalHandler(&handler);
        parser->setErrorHandler(&handler);

        if (!parser->parseFirst(*source, token))
            throw cms::Exception("XMLParseError")
                << "SAXParser::parseFirst failed" << std::endl;
    } catch(const XMLException &e) {
        throw cms::Exception("XMLDocument")
            << "XMLPlatformUtils::Initialize failed because of "
            << XMLSimpleStr(e.getMessage()) << std::endl;
    } catch(const SAXException &e) {
        throw cms::Exception("XMLDocument")
            << "XML parser reported: "
            << XMLSimpleStr(e.getMessage()) << "." << std::endl;  
        }
}

XMLDocument::~XMLDocument()
{
}

bool XMLDocument::parse()
{
    try {
        if (done || parser->getErrorCount())
            return false;

        done = !parser->parseNext(token);
    } catch(const XMLException &e) {
        throw cms::Exception("XMLDocument")
            << "XMLPlatformUtils::Initialize failed because of "
            << XMLSimpleStr(e.getMessage()) << std::endl;
    } catch(const SAXException &e) {
        throw cms::Exception("XMLDocument")
            << "XML parser reported: "
            << XMLSimpleStr(e.getMessage()) << "." << std::endl;  
        }

    return !done;
}

CBInputStream::Reader::~Reader()
{
}

CBInputStream::CBInputStream(Reader &reader) :
    reader(reader)
{
}

CBInputStream::~CBInputStream()
{
}

unsigned int CBInputStream::readBytes(XMLByte* const buf,
                                      const unsigned int size)
{
    char *rawBuf = reinterpret_cast<char*>(buf);
    unsigned int bytes = size * sizeof(XMLByte);
    unsigned int read = 0;

    while(read < bytes) {
        if (buffer.empty()) {
            buffer = reader.data();
            if (buffer.empty())
                break;
        }

        unsigned int len = buffer.length();
        unsigned int rem = bytes - read;
        if (rem < len) {
            std::memcpy(rawBuf + read, buffer.c_str(), rem);
            buffer.erase(0, rem);
            read += rem;
            break;
        }

        std::memcpy(rawBuf + read, buffer.c_str(), len);
        buffer.clear();
        read += len;
    }

    read /= sizeof(XMLByte);
    pos += read;

    return read;
}

STLInputStream::STLInputStream(std::istream &in) :
    in(in)
{
    if (in.bad())
        throw cms::Exception("FileStreamError")
            << "I/O stream bad in STLInputStream::STLInputStream()"
            << std::endl;
}

STLInputStream::~STLInputStream()
{
}

unsigned int STLInputStream::readBytes(XMLByte* const buf,
                                       const unsigned int size)
{
    char *rawBuf = reinterpret_cast<char*>(buf);
    unsigned int bytes = size * sizeof(XMLByte);
    in.read(rawBuf, bytes);
    unsigned int readBytes = in.gcount();

    if (in.bad())
        throw cms::Exception("FileStreamError")
            << "I/O stream bad in STLInputStream::readBytes()"
            << std::endl;

    unsigned int read = (unsigned int)(readBytes / sizeof(XMLByte));
    unsigned int rest = (unsigned int)(readBytes % sizeof(XMLByte));
    for(unsigned int i = 1; i <= rest; i++)
        in.putback(rawBuf[readBytes - i]);

    pos += read;
    return read;
}

StorageInputStream::StorageInputStream(StorageWrap &in) :
    in(in)
{
}

StorageInputStream::~StorageInputStream()
{
}

unsigned int StorageInputStream::readBytes(XMLByte* const buf,
                                           const unsigned int size)
{
    void *rawBuf = reinterpret_cast<void*>(buf);
    unsigned int bytes = size * sizeof(XMLByte);
    unsigned int readBytes = in->read(rawBuf, bytes);

    unsigned int read = (unsigned int)(readBytes / sizeof(XMLByte));
    unsigned int rest = (unsigned int)(readBytes % sizeof(XMLByte));
    if (rest)
        in->position(-(IOOffset)rest, Storage::CURRENT);

    pos += read;
    return read;
}

} // namespace lhef