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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
#include <documentbuilder.hxx>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <libxml/xmlerror.h>
#include <libxml/tree.h>
#include <boost/shared_ptr.hpp>
#include <rtl/alloc.h>
#include <rtl/ustrbuf.hxx>
#include <comphelper/processfactory.hxx>
#include <cppuhelper/implbase1.hxx>
#include <com/sun/star/xml/sax/SAXParseException.hpp>
#include <com/sun/star/ucb/XCommandEnvironment.hpp>
#include <com/sun/star/task/XInteractionHandler.hpp>
#include <ucbhelper/content.hxx>
#include <ucbhelper/commandenvironment.hxx>
#include <node.hxx>
#include <document.hxx>
using ::com::sun::star::xml::sax::InputSource;
using namespace ucbhelper;
using namespace ::com::sun::star::ucb;
using ::com::sun::star::task::XInteractionHandler;
namespace DOM
{
class CDefaultEntityResolver : public cppu::WeakImplHelper1< XEntityResolver >
{
public:
virtual InputSource SAL_CALL resolveEntity( const OUString& sPublicId, const OUString& sSystemId )
throw (::com::sun::star::uno::RuntimeException)
{
InputSource is;
is.sPublicId = sPublicId;
is.sSystemId = sSystemId;
is.sEncoding = OUString();
try {
Reference< XCommandEnvironment > aEnvironment(
new CommandEnvironment(Reference< XInteractionHandler >(),
Reference< XProgressHandler >() ));
Content aContent(sSystemId, aEnvironment, comphelper::getProcessComponentContext());
is.aInputStream = aContent.openStream();
} catch (const com::sun::star::uno::Exception&) {
OSL_FAIL("exception in default entity resolver");
is.aInputStream = Reference< XInputStream >();
}
return is;
}
};
CDocumentBuilder::CDocumentBuilder(
Reference< XMultiServiceFactory > const& xFactory)
: m_xFactory(xFactory)
, m_xEntityResolver(new CDefaultEntityResolver())
{
// init libxml. libxml will protect itself against multiple
// initializations so there is no problem here if this gets
// called multiple times.
xmlInitParser();
}
Reference< XInterface > CDocumentBuilder::_getInstance(const Reference< XMultiServiceFactory >& rSMgr)
{
return static_cast< XDocumentBuilder* >(new CDocumentBuilder(rSMgr));
}
const char* CDocumentBuilder::aImplementationName = "com.sun.star.comp.xml.dom.DocumentBuilder";
const char* CDocumentBuilder::aSupportedServiceNames[] = {
"com.sun.star.xml.dom.DocumentBuilder",
NULL
};
OUString CDocumentBuilder::_getImplementationName()
{
return OUString::createFromAscii(aImplementationName);
}
Sequence<OUString> CDocumentBuilder::_getSupportedServiceNames()
{
Sequence<OUString> aSequence;
for (int i=0; aSupportedServiceNames[i]!=NULL; i++) {
aSequence.realloc(i+1);
aSequence[i]=(OUString::createFromAscii(aSupportedServiceNames[i]));
}
return aSequence;
}
Sequence< OUString > SAL_CALL CDocumentBuilder::getSupportedServiceNames()
throw (RuntimeException)
{
return CDocumentBuilder::_getSupportedServiceNames();
}
OUString SAL_CALL CDocumentBuilder::getImplementationName()
throw (RuntimeException)
{
return CDocumentBuilder::_getImplementationName();
}
sal_Bool SAL_CALL CDocumentBuilder::supportsService(const OUString& aServiceName)
throw (RuntimeException)
{
Sequence< OUString > supported = CDocumentBuilder::_getSupportedServiceNames();
for (sal_Int32 i=0; i<supported.getLength(); i++)
{
if (supported[i] == aServiceName) return sal_True;
}
return sal_False;
}
Reference< XDOMImplementation > SAL_CALL CDocumentBuilder::getDOMImplementation()
throw (RuntimeException)
{
return Reference< XDOMImplementation >();
}
sal_Bool SAL_CALL CDocumentBuilder::isNamespaceAware()
throw (RuntimeException)
{
return sal_True;
}
sal_Bool SAL_CALL CDocumentBuilder::isValidating()
throw (RuntimeException)
{
return sal_False;
}
Reference< XDocument > SAL_CALL CDocumentBuilder::newDocument()
throw (RuntimeException)
{
::osl::MutexGuard const g(m_Mutex);
// create a new document
xmlDocPtr pDocument = xmlNewDoc((const xmlChar*)"1.0");
Reference< XDocument > const xRet(
CDocument::CreateCDocument(pDocument).get());
return xRet;
}
static OUString make_error_message(xmlParserCtxtPtr ctxt)
{
OUStringBuffer buf;
buf.appendAscii(ctxt->lastError.message);
buf.appendAscii("Line: ");
buf.append(static_cast<sal_Int32>(ctxt->lastError.line));
buf.appendAscii("\nColumn: ");
buf.append(static_cast<sal_Int32>(ctxt->lastError.int2));
OUString msg = buf.makeStringAndClear();
return msg;
}
// -- callbacks and context struct for parsing from stream
// -- c-linkage, so the callbacks can be used by libxml
extern "C" {
// context struct passed to IO functions
typedef struct context {
CDocumentBuilder *pBuilder;
Reference< XInputStream > rInputStream;
bool close;
bool freeOnClose;
} context_t;
static int xmlIO_read_func( void *context, char *buffer, int len)
{
// get the context...
context_t *pctx = static_cast<context_t*>(context);
if (!pctx->rInputStream.is())
return -1;
try {
// try to read the requested number of bytes
Sequence< sal_Int8 > chunk(len);
int nread = pctx->rInputStream->readBytes(chunk, len);
// copy bytes to the provided buffer
memcpy(buffer, chunk.getConstArray(), nread);
return nread;
} catch (const com::sun::star::uno::Exception& ex) {
(void) ex;
OSL_FAIL(OUStringToOString(ex.Message, RTL_TEXTENCODING_UTF8).getStr());
return -1;
}
}
static int xmlIO_close_func(void* context)
{
// get the context...
context_t *pctx = static_cast<context_t*>(context);
if (!pctx->rInputStream.is())
return 0;
try
{
if (pctx->close)
pctx->rInputStream->closeInput();
if (pctx->freeOnClose)
delete pctx;
return 0;
} catch (const com::sun::star::uno::Exception& ex) {
(void) ex;
OSL_FAIL(OUStringToOString(ex.Message, RTL_TEXTENCODING_UTF8).getStr());
return -1;
}
}
static xmlParserInputPtr resolve_func(void *ctx,
const xmlChar *publicId,
const xmlChar *systemId)
{
// get the CDocumentBuilder object
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr)ctx;
CDocumentBuilder *builder = static_cast< CDocumentBuilder* >(ctxt->_private);
Reference< XEntityResolver > resolver = builder->getEntityResolver();
OUString sysid;
if (systemId != 0)
sysid = OUString((sal_Char*)systemId, strlen((char*)systemId), RTL_TEXTENCODING_UTF8);
OUString pubid;
if (publicId != 0)
pubid = OUString((sal_Char*)publicId, strlen((char*)publicId), RTL_TEXTENCODING_UTF8);
// resolve the entity
InputSource src = resolver->resolveEntity(pubid, sysid);
// create IO context on heap because this call will no longer be on the stack
// when IO is actually performed through the callbacks. The close function must
// free the memory which is indicated by the freeOnClose field in the context struct
context_t *c = new context_t;
c->pBuilder = builder;
c->rInputStream = src.aInputStream;
c->close = true;
c->freeOnClose = true;
// set up the inputBuffer and inputPtr for libxml
xmlParserInputBufferPtr pBuffer =
xmlParserInputBufferCreateIO(xmlIO_read_func, xmlIO_close_func, c, XML_CHAR_ENCODING_NONE);
xmlParserInputPtr pInput =
xmlNewIOInputStream(ctxt, pBuffer, XML_CHAR_ENCODING_NONE);
return pInput;
}
#if 0
static xmlParserInputPtr external_entity_loader(const char *URL, const char * /*ID*/, xmlParserCtxtPtr ctxt)
{
// just call our resolver function using the URL as systemId
return resolve_func(ctxt, 0, (const xmlChar*)URL);
}
#endif
// default warning handler does not trigger assertion
static void warning_func(void * ctx, const char * /*msg*/, ...)
{
OUStringBuffer buf("libxml2 warning\n");
buf.append(make_error_message(static_cast< xmlParserCtxtPtr >(ctx)));
OString msg = OUStringToOString(buf.makeStringAndClear(), RTL_TEXTENCODING_ASCII_US);
OSL_TRACE(msg.getStr());
}
// default error handler triggers assertion
static void error_func(void * ctx, const char * /*msg*/, ...)
{
OUStringBuffer buf("libxml2 error\n");
buf.append(make_error_message(static_cast< xmlParserCtxtPtr >(ctx)));
OString msg = OUStringToOString(buf.makeStringAndClear(), RTL_TEXTENCODING_ASCII_US);
OSL_FAIL(msg.getStr());
}
} // extern "C"
void throwEx(xmlParserCtxtPtr ctxt)
{
com::sun::star::xml::sax::SAXParseException saxex;
saxex.Message = make_error_message(ctxt);
saxex.LineNumber = static_cast<sal_Int32>(ctxt->lastError.line);
saxex.ColumnNumber = static_cast<sal_Int32>(ctxt->lastError.int2);
throw saxex;
}
Reference< XDocument > SAL_CALL CDocumentBuilder::parse(const Reference< XInputStream >& is)
throw (RuntimeException, SAXParseException, IOException)
{
if (!is.is()) {
throw RuntimeException();
}
::osl::MutexGuard const g(m_Mutex);
// encoding...
/*
xmlChar *encstr = (xmlChar*) OUStringToOString(src.sEncoding, RTL_TEXTENCODING_UTF8).getStr();
xmlCharEncoding enc = xmlParseCharEncoding(encstr);
*/
::boost::shared_ptr<xmlParserCtxt> const pContext(
xmlNewParserCtxt(), xmlFreeParserCtxt);
// register error functions to prevent errors being printed
// on the console
pContext->_private = this;
pContext->sax->error = error_func;
pContext->sax->warning = warning_func;
pContext->sax->resolveEntity = resolve_func;
// IO context struct
context_t c;
c.pBuilder = this;
c.rInputStream = is;
// we did not open the stream, thus we do not close it.
c.close = false;
c.freeOnClose = false;
xmlDocPtr const pDoc = xmlCtxtReadIO(pContext.get(),
xmlIO_read_func, xmlIO_close_func, &c, 0, 0, 0);
if (pDoc == 0) {
throwEx(pContext.get());
}
Reference< XDocument > const xRet(
CDocument::CreateCDocument(pDoc).get());
return xRet;
}
Reference< XDocument > SAL_CALL CDocumentBuilder::parseURI(const OUString& sUri)
throw (RuntimeException, SAXParseException, IOException)
{
::osl::MutexGuard const g(m_Mutex);
::boost::shared_ptr<xmlParserCtxt> const pContext(
xmlNewParserCtxt(), xmlFreeParserCtxt);
pContext->_private = this;
pContext->sax->error = error_func;
pContext->sax->warning = warning_func;
pContext->sax->resolveEntity = resolve_func;
// xmlSetExternalEntityLoader(external_entity_loader);
OString oUri = OUStringToOString(sUri, RTL_TEXTENCODING_UTF8);
char *uri = (char*) oUri.getStr();
xmlDocPtr pDoc = xmlCtxtReadFile(pContext.get(), uri, 0, 0);
if (pDoc == 0) {
throwEx(pContext.get());
}
Reference< XDocument > const xRet(
CDocument::CreateCDocument(pDoc).get());
return xRet;
}
void SAL_CALL
CDocumentBuilder::setEntityResolver(Reference< XEntityResolver > const& xER)
throw (RuntimeException)
{
::osl::MutexGuard const g(m_Mutex);
m_xEntityResolver = xER;
}
Reference< XEntityResolver > SAL_CALL CDocumentBuilder::getEntityResolver()
throw (RuntimeException)
{
::osl::MutexGuard const g(m_Mutex);
return m_xEntityResolver;
}
void SAL_CALL
CDocumentBuilder::setErrorHandler(Reference< XErrorHandler > const& xEH)
throw (RuntimeException)
{
::osl::MutexGuard const g(m_Mutex);
m_xErrorHandler = xEH;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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