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/* Copyright (C) 2015 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "RelaxNG.h"
#include "lib/timer.h"
#include "lib/utf8.h"
#include "ps/CLogger.h"
#include "ps/Filesystem.h"
#include <libxml/relaxng.h>
#include <map>
TIMER_ADD_CLIENT(xml_validation);
/*
* libxml2 leaks memory when parsing schemas: https://bugzilla.gnome.org/show_bug.cgi?id=615767
* To minimise that problem, keep a global cache of parsed schemas, so we don't
* leak an indefinitely large amount of memory when repeatedly restarting the simulation.
*/
class RelaxNGSchema;
static std::map<std::string, shared_ptr<RelaxNGSchema> > g_SchemaCache;
static CMutex g_SchemaCacheLock;
void ClearSchemaCache()
{
CScopeLock lock(g_SchemaCacheLock);
g_SchemaCache.clear();
}
static void relaxNGErrorHandler(void* UNUSED(userData), xmlErrorPtr error)
{
// Strip a trailing newline
std::string message = error->message;
if (message.length() > 0 && message[message.length()-1] == '\n')
message.erase(message.length()-1);
LOGERROR("RelaxNGValidator: Validation %s: %s:%d: %s",
error->level == XML_ERR_WARNING ? "warning" : "error",
error->file, error->line, message.c_str());
}
class RelaxNGSchema
{
public:
xmlRelaxNGPtr m_Schema;
RelaxNGSchema(const std::string& grammar)
{
xmlRelaxNGParserCtxtPtr ctxt = xmlRelaxNGNewMemParserCtxt(grammar.c_str(), (int)grammar.size());
m_Schema = xmlRelaxNGParse(ctxt);
xmlRelaxNGFreeParserCtxt(ctxt);
if (m_Schema == NULL)
LOGERROR("RelaxNGValidator: Failed to compile schema");
}
~RelaxNGSchema()
{
if (m_Schema)
xmlRelaxNGFree(m_Schema);
}
};
RelaxNGValidator::RelaxNGValidator() :
m_Schema(NULL)
{
}
RelaxNGValidator::~RelaxNGValidator()
{
}
bool RelaxNGValidator::LoadGrammar(const std::string& grammar)
{
shared_ptr<RelaxNGSchema> schema;
{
CScopeLock lock(g_SchemaCacheLock);
std::map<std::string, shared_ptr<RelaxNGSchema> >::iterator it = g_SchemaCache.find(grammar);
if (it == g_SchemaCache.end())
{
schema = shared_ptr<RelaxNGSchema>(new RelaxNGSchema(grammar));
g_SchemaCache[grammar] = schema;
}
else
{
schema = it->second;
}
}
m_Schema = schema->m_Schema;
if (!m_Schema)
return false;
MD5 hash;
hash.Update((const u8*)grammar.c_str(), grammar.length());
m_Hash = hash;
return true;
}
bool RelaxNGValidator::LoadGrammarFile(const PIVFS& vfs, const VfsPath& grammarPath)
{
CVFSFile file;
if (file.Load(vfs, grammarPath) != PSRETURN_OK)
return false;
return LoadGrammar(file.DecodeUTF8());
}
bool RelaxNGValidator::Validate(const std::wstring& filename, const std::wstring& document) const
{
std::string docutf8 = "<?xml version='1.0' encoding='utf-8'?>" + utf8_from_wstring(document);
return ValidateEncoded(filename, docutf8);
}
bool RelaxNGValidator::ValidateEncoded(const std::wstring& filename, const std::string& document) const
{
TIMER_ACCRUE(xml_validation);
if (!m_Schema)
{
LOGERROR("RelaxNGValidator: No grammar loaded");
return false;
}
xmlDocPtr doc = xmlReadMemory(document.c_str(), (int)document.size(), utf8_from_wstring(filename).c_str(), NULL, XML_PARSE_NONET);
if (doc == NULL)
{
LOGERROR("RelaxNGValidator: Failed to parse document '%s'", utf8_from_wstring(filename).c_str());
return false;
}
bool ret = ValidateEncoded(doc);
xmlFreeDoc(doc);
return ret;
}
bool RelaxNGValidator::ValidateEncoded(xmlDocPtr doc) const
{
xmlRelaxNGValidCtxtPtr ctxt = xmlRelaxNGNewValidCtxt(m_Schema);
xmlRelaxNGSetValidStructuredErrors(ctxt, &relaxNGErrorHandler, NULL);
int ret = xmlRelaxNGValidateDoc(ctxt, doc);
xmlRelaxNGFreeValidCtxt(ctxt);
if (ret == 0)
{
return true;
}
else if (ret > 0)
{
LOGERROR("RelaxNGValidator: Validation failed for '%s'", doc->name);
return false;
}
else
{
LOGERROR("RelaxNGValidator: Internal error %d", ret);
return false;
}
}
bool RelaxNGValidator::CanValidate() const
{
return m_Schema != NULL;
}
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