third_party/WebKit/Source/core/xml/XSLTProcessorLibxslt.cpp - chromium/src - Git at Google

 /*
  * This file is part of the XSL implementation.
  *
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple, Inc. All rights reserved.
  * Copyright (C) 2005, 2006 Alexey Proskuryakov <ap@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #include "core/xml/XSLTProcessor.h"

 #include "core/dom/Document.h"
 #include "core/dom/TransformSource.h"
 #include "core/editing/serializers/Serialization.h"
 #include "core/fetch/FetchInitiatorTypeNames.h"
 #include "core/fetch/RawResource.h"
 #include "core/fetch/Resource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/xml/XSLStyleSheet.h"
 #include "core/xml/XSLTExtensions.h"
 #include "core/xml/XSLTUnicodeSort.h"
 #include "core/xml/parser/XMLDocumentParser.h"
 #include "platform/SharedBuffer.h"
 #include "platform/network/ResourceError.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/Assertions.h"
 #include "wtf/Partitions.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/UTF8.h"
 #include <libxslt/imports.h>
 #include <libxslt/security.h>
 #include <libxslt/variables.h>
 #include <libxslt/xsltutils.h>

 namespace blink {

 void XSLTProcessor::genericErrorFunc(void*, const char*, ...)
 {
     // It would be nice to do something with this error message.
 }

 void XSLTProcessor::parseErrorFunc(void* userData, xmlError* error)
 {
     FrameConsole* console = static_cast<FrameConsole*>(userData);
     if (!console)
         return;

     MessageLevel level;
     switch (error->level) {
     case XML_ERR_NONE:
         level = DebugMessageLevel;
         break;
     case XML_ERR_WARNING:
         level = WarningMessageLevel;
         break;
     case XML_ERR_ERROR:
     case XML_ERR_FATAL:
     default:
         level = ErrorMessageLevel;
         break;
     }

     console->addMessage(ConsoleMessage::create(XMLMessageSource, level, error->message, error->file, error->line));
 }

 // FIXME: There seems to be no way to control the ctxt pointer for loading here, thus we have globals.
 static XSLTProcessor* globalProcessor = nullptr;
 static ResourceFetcher* globalResourceFetcher = nullptr;

 static xmlDocPtr docLoaderFunc(
     const xmlChar* uri, xmlDictPtr, int options, void* ctxt, xsltLoadType type)
 {
     if (!globalProcessor)
         return nullptr;

     switch (type) {
     case XSLT_LOAD_DOCUMENT: {
         xsltTransformContextPtr context = (xsltTransformContextPtr)ctxt;
         xmlChar* base = xmlNodeGetBase(context->document->doc, context->node);
         KURL url(KURL(ParsedURLString, reinterpret_cast<const char*>(base)), reinterpret_cast<const char*>(uri));
         xmlFree(base);

         ResourceLoaderOptions fetchOptions(ResourceFetcher::defaultResourceOptions());
         FetchRequest request(ResourceRequest(url), FetchInitiatorTypeNames::xml, fetchOptions);
         request.setOriginRestriction(FetchRequest::RestrictToSameOrigin);
         RefPtrWillBeRawPtr<Resource> resource = RawResource::fetchSynchronously(request, globalResourceFetcher);
         if (!resource || !globalProcessor)
             return nullptr;

         FrameConsole* console = nullptr;
         LocalFrame* frame = globalProcessor->xslStylesheet()->ownerDocument()->frame();
         if (frame)
             console = &frame->console();
         xmlSetStructuredErrorFunc(console, XSLTProcessor::parseErrorFunc);
         xmlSetGenericErrorFunc(console, XSLTProcessor::genericErrorFunc);

         // We don't specify an encoding here. Neither Gecko nor WinIE respects
         // the encoding specified in the HTTP headers.
         SharedBuffer* data = resource->resourceBuffer();
         xmlDocPtr doc = data ? xmlReadMemory(data->data(), data->size(), (const char*)uri, 0, options) : nullptr;

         xmlSetStructuredErrorFunc(0, 0);
         xmlSetGenericErrorFunc(0, 0);

         return doc;
     }
     case XSLT_LOAD_STYLESHEET:
         return globalProcessor->xslStylesheet()->locateStylesheetSubResource(((xsltStylesheetPtr)ctxt)->doc, uri);
     default:
         break;
     }

     return nullptr;
 }

 static inline void setXSLTLoadCallBack(xsltDocLoaderFunc func, XSLTProcessor* processor, ResourceFetcher* fetcher)
 {
     xsltSetLoaderFunc(func);
     globalProcessor = processor;
     globalResourceFetcher = fetcher;
 }

 static int writeToStringBuilder(void* context, const char* buffer, int len)
 {
     StringBuilder& resultOutput = *static_cast<StringBuilder*>(context);

     if (!len)
         return 0;

     StringBuffer<UChar> stringBuffer(len);
     UChar* bufferUChar = stringBuffer.characters();
     UChar* bufferUCharEnd = bufferUChar + len;

     const char* stringCurrent = buffer;
     WTF::Unicode::ConversionResult result = WTF::Unicode::convertUTF8ToUTF16(&stringCurrent, buffer + len, &bufferUChar, bufferUCharEnd);
     if (result != WTF::Unicode::conversionOK && result != WTF::Unicode::sourceExhausted) {
         ASSERT_NOT_REACHED();
         return -1;
     }

     int utf16Length = bufferUChar - stringBuffer.characters();
     resultOutput.append(stringBuffer.characters(), utf16Length);
     return stringCurrent - buffer;
 }

 static bool saveResultToString(xmlDocPtr resultDoc, xsltStylesheetPtr sheet, String& resultString)
 {
     xmlOutputBufferPtr outputBuf = xmlAllocOutputBuffer(0);
     if (!outputBuf)
         return false;

     StringBuilder resultBuilder;
     outputBuf->context = &resultBuilder;
     outputBuf->writecallback = writeToStringBuilder;

     int retval = xsltSaveResultTo(outputBuf, resultDoc, sheet);
     xmlOutputBufferClose(outputBuf);
     if (retval < 0)
         return false;

     // Workaround for <http://bugzilla.gnome.org/show_bug.cgi?id=495668>:
     // libxslt appends an extra line feed to the result.
     if (resultBuilder.length() > 0 && resultBuilder[resultBuilder.length() - 1] == '\n')
         resultBuilder.resize(resultBuilder.length() - 1);

     resultString = resultBuilder.toString();

     return true;
 }

 static char* allocateParameterArray(const char* data)
 {
     size_t length = strlen(data) + 1;
     char* parameterArray = static_cast<char*>(WTF::Partitions::fastMalloc(length, WTF_HEAP_PROFILER_TYPE_NAME(XSLTProcessor)));
     memcpy(parameterArray, data, length);
     return parameterArray;
 }

 static const char** xsltParamArrayFromParameterMap(XSLTProcessor::ParameterMap& parameters)
 {
     if (parameters.isEmpty())
         return nullptr;

     const char** parameterArray = static_cast<const char**>(WTF::Partitions::fastMalloc(((parameters.size() * 2) + 1) * sizeof(char*), WTF_HEAP_PROFILER_TYPE_NAME(XSLTProcessor)));

     unsigned index = 0;
     for (auto& parameter : parameters) {
         parameterArray[index++] = allocateParameterArray(parameter.key.utf8().data());
         parameterArray[index++] = allocateParameterArray(parameter.value.utf8().data());
     }
     parameterArray[index] = 0;

     return parameterArray;
 }

 static void freeXsltParamArray(const char** params)
 {
     const char** temp = params;
     if (!params)
         return;

     while (*temp) {
         WTF::Partitions::fastFree(const_cast<char*>(*(temp++)));
         WTF::Partitions::fastFree(const_cast<char*>(*(temp++)));
     }
     WTF::Partitions::fastFree(params);
 }

 static xsltStylesheetPtr xsltStylesheetPointer(Document* document, RefPtrWillBeMember<XSLStyleSheet>& cachedStylesheet, Node* stylesheetRootNode)
 {
     if (!cachedStylesheet && stylesheetRootNode) {
         // When using importStylesheet, we will use the given document as the imported stylesheet's owner.
         cachedStylesheet = XSLStyleSheet::createForXSLTProcessor(
             stylesheetRootNode->parentNode() ? &stylesheetRootNode->parentNode()->document() : document,
             stylesheetRootNode,
             stylesheetRootNode->document().url().string(),
             stylesheetRootNode->document().url()); // FIXME: Should we use baseURL here?

         // According to Mozilla documentation, the node must be a Document node,
         // an xsl:stylesheet or xsl:transform element. But we just use text
         // content regardless of node type.
         cachedStylesheet->parseString(createMarkup(stylesheetRootNode));
     }

     if (!cachedStylesheet || !cachedStylesheet->document())
         return nullptr;

     return cachedStylesheet->compileStyleSheet();
 }

 static inline xmlDocPtr xmlDocPtrFromNode(Node* sourceNode, bool& shouldDelete)
 {
     RefPtrWillBeRawPtr<Document> ownerDocument(sourceNode->document());
     bool sourceIsDocument = (sourceNode == ownerDocument.get());

     xmlDocPtr sourceDoc = nullptr;
     if (sourceIsDocument && ownerDocument->transformSource())
         sourceDoc = (xmlDocPtr)ownerDocument->transformSource()->platformSource();
     if (!sourceDoc) {
         sourceDoc = (xmlDocPtr)xmlDocPtrForString(ownerDocument.get(), createMarkup(sourceNode),
             sourceIsDocument ? ownerDocument->url().string() : String());
         shouldDelete = sourceDoc;
     }
     return sourceDoc;
 }

 static inline String resultMIMEType(xmlDocPtr resultDoc, xsltStylesheetPtr sheet)
 {
     // There are three types of output we need to be able to deal with:
     // HTML (create an HTML document), XML (create an XML document),
     // and text (wrap in a <pre> and create an XML document).

     const xmlChar* resultType = nullptr;
     XSLT_GET_IMPORT_PTR(resultType, sheet, method);
     if (!resultType && resultDoc->type == XML_HTML_DOCUMENT_NODE)
         resultType = (const xmlChar*)"html";

     if (xmlStrEqual(resultType, (const xmlChar*)"html"))
         return "text/html";
     if (xmlStrEqual(resultType, (const xmlChar*)"text"))
         return "text/plain";

     return "application/xml";
 }

 bool XSLTProcessor::transformToString(Node* sourceNode, String& mimeType, String& resultString, String& resultEncoding)
 {
     RefPtrWillBeRawPtr<Document> ownerDocument(sourceNode->document());

     setXSLTLoadCallBack(docLoaderFunc, this, ownerDocument->fetcher());
     xsltStylesheetPtr sheet = xsltStylesheetPointer(m_document.get(), m_stylesheet, m_stylesheetRootNode.get());
     if (!sheet) {
         setXSLTLoadCallBack(0, 0, 0);
         m_stylesheet = nullptr;
         return false;
     }
     m_stylesheet->clearDocuments();

     xmlChar* origMethod = sheet->method;
     if (!origMethod && mimeType == "text/html")
         sheet->method = (xmlChar*)"html";

     bool success = false;
     bool shouldFreeSourceDoc = false;
     if (xmlDocPtr sourceDoc = xmlDocPtrFromNode(sourceNode, shouldFreeSourceDoc)) {
         // The XML declaration would prevent parsing the result as a fragment,
         // and it's not needed even for documents, as the result of this
         // function is always immediately parsed.
         sheet->omitXmlDeclaration = true;

         xsltTransformContextPtr transformContext = xsltNewTransformContext(sheet, sourceDoc);
         registerXSLTExtensions(transformContext);

         xsltSecurityPrefsPtr securityPrefs = xsltNewSecurityPrefs();
         // Read permissions are checked by docLoaderFunc.
         if (0 != xsltSetSecurityPrefs(securityPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid))
             CRASH();
         if (0 != xsltSetSecurityPrefs(securityPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid))
             CRASH();
         if (0 != xsltSetSecurityPrefs(securityPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid))
             CRASH();
         if (0 != xsltSetCtxtSecurityPrefs(securityPrefs, transformContext))
             CRASH();

         // <http://bugs.webkit.org/show_bug.cgi?id=16077>: XSLT processor
         // <xsl:sort> algorithm only compares by code point.
         xsltSetCtxtSortFunc(transformContext, xsltUnicodeSortFunction);

         // This is a workaround for a bug in libxslt.
         // The bug has been fixed in version 1.1.13, so once we ship that this
         // can be removed.
         if (!transformContext->globalVars)
             transformContext->globalVars = xmlHashCreate(20);

         const char** params = xsltParamArrayFromParameterMap(m_parameters);
         xsltQuoteUserParams(transformContext, params);
         xmlDocPtr resultDoc = xsltApplyStylesheetUser(sheet, sourceDoc, 0, 0, 0, transformContext);

         xsltFreeTransformContext(transformContext);
         xsltFreeSecurityPrefs(securityPrefs);
         freeXsltParamArray(params);

         if (shouldFreeSourceDoc)
             xmlFreeDoc(sourceDoc);

         success = saveResultToString(resultDoc, sheet, resultString);
         if (success) {
             mimeType = resultMIMEType(resultDoc, sheet);
             resultEncoding = (char*)resultDoc->encoding;
         }
         xmlFreeDoc(resultDoc);
     }

     sheet->method = origMethod;
     setXSLTLoadCallBack(0, 0, 0);
     xsltFreeStylesheet(sheet);
     m_stylesheet = nullptr;

     return success;
 }

 } // namespace blink
	/*
	* This file is part of the XSL implementation.
	*
	* Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple, Inc. All rights reserved.
	* Copyright (C) 2005, 2006 Alexey Proskuryakov <ap@webkit.org>
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#include "core/xml/XSLTProcessor.h"

	#include "core/dom/Document.h"
	#include "core/dom/TransformSource.h"
	#include "core/editing/serializers/Serialization.h"
	#include "core/fetch/FetchInitiatorTypeNames.h"
	#include "core/fetch/RawResource.h"
	#include "core/fetch/Resource.h"
	#include "core/fetch/ResourceFetcher.h"
	#include "core/frame/FrameConsole.h"
	#include "core/frame/FrameHost.h"
	#include "core/frame/LocalFrame.h"
	#include "core/inspector/ConsoleMessage.h"
	#include "core/xml/XSLStyleSheet.h"
	#include "core/xml/XSLTExtensions.h"
	#include "core/xml/XSLTUnicodeSort.h"
	#include "core/xml/parser/XMLDocumentParser.h"
	#include "platform/SharedBuffer.h"
	#include "platform/network/ResourceError.h"
	#include "platform/network/ResourceRequest.h"
	#include "platform/network/ResourceResponse.h"
	#include "platform/weborigin/SecurityOrigin.h"
	#include "wtf/Assertions.h"
	#include "wtf/Partitions.h"
	#include "wtf/text/CString.h"
	#include "wtf/text/StringBuffer.h"
	#include "wtf/text/UTF8.h"
	#include <libxslt/imports.h>
	#include <libxslt/security.h>
	#include <libxslt/variables.h>
	#include <libxslt/xsltutils.h>

	namespace blink {

	void XSLTProcessor::genericErrorFunc(void, const char, ...)
	{
	// It would be nice to do something with this error message.
	}

	void XSLTProcessor::parseErrorFunc(void* userData, xmlError* error)
	{
	FrameConsole* console = static_cast<FrameConsole*>(userData);
	if (!console)
	return;

	MessageLevel level;
	switch (error->level) {
	case XML_ERR_NONE:
	level = DebugMessageLevel;
	break;
	case XML_ERR_WARNING:
	level = WarningMessageLevel;
	break;
	case XML_ERR_ERROR:
	case XML_ERR_FATAL:
	default:
	level = ErrorMessageLevel;
	break;
	}

	console->addMessage(ConsoleMessage::create(XMLMessageSource, level, error->message, error->file, error->line));
	}

	// FIXME: There seems to be no way to control the ctxt pointer for loading here, thus we have globals.
	static XSLTProcessor* globalProcessor = nullptr;
	static ResourceFetcher* globalResourceFetcher = nullptr;

	static xmlDocPtr docLoaderFunc(
	const xmlChar* uri, xmlDictPtr, int options, void* ctxt, xsltLoadType type)
	{
	if (!globalProcessor)
	return nullptr;

	switch (type) {
	case XSLT_LOAD_DOCUMENT: {
	xsltTransformContextPtr context = (xsltTransformContextPtr)ctxt;
	xmlChar* base = xmlNodeGetBase(context->document->doc, context->node);
	KURL url(KURL(ParsedURLString, reinterpret_cast<const char>(base)), reinterpret_cast<const char>(uri));
	xmlFree(base);

	ResourceLoaderOptions fetchOptions(ResourceFetcher::defaultResourceOptions());
	FetchRequest request(ResourceRequest(url), FetchInitiatorTypeNames::xml, fetchOptions);
	request.setOriginRestriction(FetchRequest::RestrictToSameOrigin);
	RefPtrWillBeRawPtr<Resource> resource = RawResource::fetchSynchronously(request, globalResourceFetcher);
	if (!resource \|\| !globalProcessor)
	return nullptr;

	FrameConsole* console = nullptr;
	LocalFrame* frame = globalProcessor->xslStylesheet()->ownerDocument()->frame();
	if (frame)
	console = &frame->console();
	xmlSetStructuredErrorFunc(console, XSLTProcessor::parseErrorFunc);
	xmlSetGenericErrorFunc(console, XSLTProcessor::genericErrorFunc);

	// We don't specify an encoding here. Neither Gecko nor WinIE respects
	// the encoding specified in the HTTP headers.
	SharedBuffer* data = resource->resourceBuffer();
	xmlDocPtr doc = data ? xmlReadMemory(data->data(), data->size(), (const char*)uri, 0, options) : nullptr;

	xmlSetStructuredErrorFunc(0, 0);
	xmlSetGenericErrorFunc(0, 0);

	return doc;
	}
	case XSLT_LOAD_STYLESHEET:
	return globalProcessor->xslStylesheet()->locateStylesheetSubResource(((xsltStylesheetPtr)ctxt)->doc, uri);
	default:
	break;
	}

	return nullptr;
	}

	static inline void setXSLTLoadCallBack(xsltDocLoaderFunc func, XSLTProcessor* processor, ResourceFetcher* fetcher)
	{
	xsltSetLoaderFunc(func);
	globalProcessor = processor;
	globalResourceFetcher = fetcher;
	}

	static int writeToStringBuilder(void* context, const char* buffer, int len)
	{
	StringBuilder& resultOutput = static_cast<StringBuilder>(context);

	if (!len)
	return 0;

	StringBuffer<UChar> stringBuffer(len);
	UChar* bufferUChar = stringBuffer.characters();
	UChar* bufferUCharEnd = bufferUChar + len;

	const char* stringCurrent = buffer;
	WTF::Unicode::ConversionResult result = WTF::Unicode::convertUTF8ToUTF16(&stringCurrent, buffer + len, &bufferUChar, bufferUCharEnd);
	if (result != WTF::Unicode::conversionOK && result != WTF::Unicode::sourceExhausted) {
	ASSERT_NOT_REACHED();
	return -1;
	}

	int utf16Length = bufferUChar - stringBuffer.characters();
	resultOutput.append(stringBuffer.characters(), utf16Length);
	return stringCurrent - buffer;
	}

	static bool saveResultToString(xmlDocPtr resultDoc, xsltStylesheetPtr sheet, String& resultString)
	{
	xmlOutputBufferPtr outputBuf = xmlAllocOutputBuffer(0);
	if (!outputBuf)
	return false;

	StringBuilder resultBuilder;
	outputBuf->context = &resultBuilder;
	outputBuf->writecallback = writeToStringBuilder;

	int retval = xsltSaveResultTo(outputBuf, resultDoc, sheet);
	xmlOutputBufferClose(outputBuf);
	if (retval < 0)
	return false;

	// Workaround for <http://bugzilla.gnome.org/show_bug.cgi?id=495668>:
	// libxslt appends an extra line feed to the result.
	if (resultBuilder.length() > 0 && resultBuilder[resultBuilder.length() - 1] == '\n')
	resultBuilder.resize(resultBuilder.length() - 1);

	resultString = resultBuilder.toString();

	return true;
	}

	static char* allocateParameterArray(const char* data)
	{
	size_t length = strlen(data) + 1;
	char* parameterArray = static_cast<char*>(WTF::Partitions::fastMalloc(length, WTF_HEAP_PROFILER_TYPE_NAME(XSLTProcessor)));
	memcpy(parameterArray, data, length);
	return parameterArray;
	}

	static const char** xsltParamArrayFromParameterMap(XSLTProcessor::ParameterMap& parameters)
	{
	if (parameters.isEmpty())
	return nullptr;

	const char parameterArray = static_cast<const char>(WTF::Partitions::fastMalloc(((parameters.size() * 2) + 1) * sizeof(char*), WTF_HEAP_PROFILER_TYPE_NAME(XSLTProcessor)));

	unsigned index = 0;
	for (auto& parameter : parameters) {
	parameterArray[index++] = allocateParameterArray(parameter.key.utf8().data());
	parameterArray[index++] = allocateParameterArray(parameter.value.utf8().data());
	}
	parameterArray[index] = 0;

	return parameterArray;
	}

	static void freeXsltParamArray(const char** params)
	{
	const char** temp = params;
	if (!params)
	return;

	while (*temp) {
	WTF::Partitions::fastFree(const_cast<char>((temp++)));
	WTF::Partitions::fastFree(const_cast<char>((temp++)));
	}
	WTF::Partitions::fastFree(params);
	}

	static xsltStylesheetPtr xsltStylesheetPointer(Document* document, RefPtrWillBeMember<XSLStyleSheet>& cachedStylesheet, Node* stylesheetRootNode)
	{
	if (!cachedStylesheet && stylesheetRootNode) {
	// When using importStylesheet, we will use the given document as the imported stylesheet's owner.
	cachedStylesheet = XSLStyleSheet::createForXSLTProcessor(
	stylesheetRootNode->parentNode() ? &stylesheetRootNode->parentNode()->document() : document,
	stylesheetRootNode,
	stylesheetRootNode->document().url().string(),
	stylesheetRootNode->document().url()); // FIXME: Should we use baseURL here?

	// According to Mozilla documentation, the node must be a Document node,
	// an xsl:stylesheet or xsl:transform element. But we just use text
	// content regardless of node type.
	cachedStylesheet->parseString(createMarkup(stylesheetRootNode));
	}

	if (!cachedStylesheet \|\| !cachedStylesheet->document())
	return nullptr;

	return cachedStylesheet->compileStyleSheet();
	}

	static inline xmlDocPtr xmlDocPtrFromNode(Node* sourceNode, bool& shouldDelete)
	{
	RefPtrWillBeRawPtr<Document> ownerDocument(sourceNode->document());
	bool sourceIsDocument = (sourceNode == ownerDocument.get());

	xmlDocPtr sourceDoc = nullptr;
	if (sourceIsDocument && ownerDocument->transformSource())
	sourceDoc = (xmlDocPtr)ownerDocument->transformSource()->platformSource();
	if (!sourceDoc) {
	sourceDoc = (xmlDocPtr)xmlDocPtrForString(ownerDocument.get(), createMarkup(sourceNode),
	sourceIsDocument ? ownerDocument->url().string() : String());
	shouldDelete = sourceDoc;
	}
	return sourceDoc;
	}

	static inline String resultMIMEType(xmlDocPtr resultDoc, xsltStylesheetPtr sheet)
	{
	// There are three types of output we need to be able to deal with:
	// HTML (create an HTML document), XML (create an XML document),
	// and text (wrap in a <pre> and create an XML document).

	const xmlChar* resultType = nullptr;
	XSLT_GET_IMPORT_PTR(resultType, sheet, method);
	if (!resultType && resultDoc->type == XML_HTML_DOCUMENT_NODE)
	resultType = (const xmlChar*)"html";

	if (xmlStrEqual(resultType, (const xmlChar*)"html"))
	return "text/html";
	if (xmlStrEqual(resultType, (const xmlChar*)"text"))
	return "text/plain";

	return "application/xml";
	}

	bool XSLTProcessor::transformToString(Node* sourceNode, String& mimeType, String& resultString, String& resultEncoding)
	{
	RefPtrWillBeRawPtr<Document> ownerDocument(sourceNode->document());

	setXSLTLoadCallBack(docLoaderFunc, this, ownerDocument->fetcher());
	xsltStylesheetPtr sheet = xsltStylesheetPointer(m_document.get(), m_stylesheet, m_stylesheetRootNode.get());
	if (!sheet) {
	setXSLTLoadCallBack(0, 0, 0);
	m_stylesheet = nullptr;
	return false;
	}
	m_stylesheet->clearDocuments();

	xmlChar* origMethod = sheet->method;
	if (!origMethod && mimeType == "text/html")
	sheet->method = (xmlChar*)"html";

	bool success = false;
	bool shouldFreeSourceDoc = false;
	if (xmlDocPtr sourceDoc = xmlDocPtrFromNode(sourceNode, shouldFreeSourceDoc)) {
	// The XML declaration would prevent parsing the result as a fragment,
	// and it's not needed even for documents, as the result of this
	// function is always immediately parsed.
	sheet->omitXmlDeclaration = true;

	xsltTransformContextPtr transformContext = xsltNewTransformContext(sheet, sourceDoc);
	registerXSLTExtensions(transformContext);

	xsltSecurityPrefsPtr securityPrefs = xsltNewSecurityPrefs();
	// Read permissions are checked by docLoaderFunc.
	if (0 != xsltSetSecurityPrefs(securityPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid))
	CRASH();
	if (0 != xsltSetSecurityPrefs(securityPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid))
	CRASH();
	if (0 != xsltSetSecurityPrefs(securityPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid))
	CRASH();
	if (0 != xsltSetCtxtSecurityPrefs(securityPrefs, transformContext))
	CRASH();

	// <http://bugs.webkit.org/show_bug.cgi?id=16077>: XSLT processor
	// <xsl:sort> algorithm only compares by code point.
	xsltSetCtxtSortFunc(transformContext, xsltUnicodeSortFunction);

	// This is a workaround for a bug in libxslt.
	// The bug has been fixed in version 1.1.13, so once we ship that this
	// can be removed.
	if (!transformContext->globalVars)
	transformContext->globalVars = xmlHashCreate(20);

	const char** params = xsltParamArrayFromParameterMap(m_parameters);
	xsltQuoteUserParams(transformContext, params);
	xmlDocPtr resultDoc = xsltApplyStylesheetUser(sheet, sourceDoc, 0, 0, 0, transformContext);

	xsltFreeTransformContext(transformContext);
	xsltFreeSecurityPrefs(securityPrefs);
	freeXsltParamArray(params);

	if (shouldFreeSourceDoc)
	xmlFreeDoc(sourceDoc);

	success = saveResultToString(resultDoc, sheet, resultString);
	if (success) {
	mimeType = resultMIMEType(resultDoc, sheet);
	resultEncoding = (char*)resultDoc->encoding;
	}
	xmlFreeDoc(resultDoc);
	}

	sheet->method = origMethod;
	setXSLTLoadCallBack(0, 0, 0);
	xsltFreeStylesheet(sheet);
	m_stylesheet = nullptr;

	return success;
	}

	} // namespace blink