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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkXMLParser.h"
#include "expat.h"
#include "SkStream.h"
#include "SkString.h"
#include "SkTo.h"
#include "SkTypes.h"
static char const* const gErrorStrings[] = {
"empty or missing file ",
"unknown element ",
"unknown attribute name ",
"error in attribute value ",
"duplicate ID ",
"unknown error "
};
SkXMLParserError::SkXMLParserError() : fCode(kNoError), fLineNumber(-1),
fNativeCode(-1)
{
reset();
}
SkXMLParserError::~SkXMLParserError()
{
// need a virtual destructor for our subclasses
}
void SkXMLParserError::getErrorString(SkString* str) const
{
SkASSERT(str);
SkString temp;
if (fCode != kNoError) {
if ((unsigned)fCode < SK_ARRAY_COUNT(gErrorStrings))
temp.set(gErrorStrings[fCode - 1]);
temp.append(fNoun);
} else
SkXMLParser::GetNativeErrorString(fNativeCode, &temp);
str->append(temp);
}
void SkXMLParserError::reset() {
fCode = kNoError;
fLineNumber = -1;
fNativeCode = -1;
}
////////////////
namespace {
const XML_Memory_Handling_Suite sk_XML_alloc = {
sk_malloc_throw,
sk_realloc_throw,
sk_free
};
struct ParsingContext {
ParsingContext(SkXMLParser* parser)
: fParser(parser)
, fXMLParser(XML_ParserCreate_MM(nullptr, &sk_XML_alloc, nullptr)) { }
void flushText() {
if (!fBufferedText.isEmpty()) {
fParser->text(fBufferedText.c_str(), SkTo<int>(fBufferedText.size()));
fBufferedText.reset();
}
}
void appendText(const char* txt, size_t len) {
fBufferedText.append(txt, len);
}
SkXMLParser* fParser;
SkAutoTCallVProc<skstd::remove_pointer_t<XML_Parser>, XML_ParserFree> fXMLParser;
private:
SkString fBufferedText;
};
#define HANDLER_CONTEXT(arg, name) ParsingContext* name = static_cast<ParsingContext*>(arg);
void XMLCALL start_element_handler(void *data, const char* tag, const char** attributes) {
HANDLER_CONTEXT(data, ctx);
ctx->flushText();
ctx->fParser->startElement(tag);
for (size_t i = 0; attributes[i]; i += 2) {
ctx->fParser->addAttribute(attributes[i], attributes[i + 1]);
}
}
void XMLCALL end_element_handler(void* data, const char* tag) {
HANDLER_CONTEXT(data, ctx);
ctx->flushText();
ctx->fParser->endElement(tag);
}
void XMLCALL text_handler(void *data, const char* txt, int len) {
HANDLER_CONTEXT(data, ctx);
ctx->appendText(txt, SkTo<size_t>(len));
}
void XMLCALL entity_decl_handler(void *data,
const XML_Char *entityName,
int is_parameter_entity,
const XML_Char *value,
int value_length,
const XML_Char *base,
const XML_Char *systemId,
const XML_Char *publicId,
const XML_Char *notationName) {
HANDLER_CONTEXT(data, ctx);
SkDebugf("'%s' entity declaration found, stopping processing", entityName);
XML_StopParser(ctx->fXMLParser, XML_FALSE);
}
} // anonymous namespace
SkXMLParser::SkXMLParser(SkXMLParserError* parserError) : fParser(nullptr), fError(parserError)
{
}
SkXMLParser::~SkXMLParser()
{
}
bool SkXMLParser::parse(SkStream& docStream)
{
ParsingContext ctx(this);
if (!ctx.fXMLParser) {
SkDebugf("could not create XML parser\n");
return false;
}
XML_SetUserData(ctx.fXMLParser, &ctx);
XML_SetElementHandler(ctx.fXMLParser, start_element_handler, end_element_handler);
XML_SetCharacterDataHandler(ctx.fXMLParser, text_handler);
// Disable entity processing, to inhibit internal entity expansion. See expat CVE-2013-0340.
XML_SetEntityDeclHandler(ctx.fXMLParser, entity_decl_handler);
static const int kBufferSize = 512 SkDEBUGCODE( - 507);
bool done = false;
do {
void* buffer = XML_GetBuffer(ctx.fXMLParser, kBufferSize);
if (!buffer) {
SkDebugf("could not buffer enough to continue\n");
return false;
}
size_t len = docStream.read(buffer, kBufferSize);
done = docStream.isAtEnd();
XML_Status status = XML_ParseBuffer(ctx.fXMLParser, SkToS32(len), done);
if (XML_STATUS_ERROR == status) {
XML_Error error = XML_GetErrorCode(ctx.fXMLParser);
int line = XML_GetCurrentLineNumber(ctx.fXMLParser);
int column = XML_GetCurrentColumnNumber(ctx.fXMLParser);
const XML_LChar* errorString = XML_ErrorString(error);
SkDebugf("parse error @%d:%d: %d (%s).\n", line, column, error, errorString);
return false;
}
} while (!done);
return true;
}
bool SkXMLParser::parse(const char doc[], size_t len)
{
SkMemoryStream docStream(doc, len);
return this->parse(docStream);
}
void SkXMLParser::GetNativeErrorString(int error, SkString* str)
{
}
bool SkXMLParser::startElement(const char elem[])
{
return this->onStartElement(elem);
}
bool SkXMLParser::addAttribute(const char name[], const char value[])
{
return this->onAddAttribute(name, value);
}
bool SkXMLParser::endElement(const char elem[])
{
return this->onEndElement(elem);
}
bool SkXMLParser::text(const char text[], int len)
{
return this->onText(text, len);
}
////////////////////////////////////////////////////////////////////////////////
bool SkXMLParser::onStartElement(const char elem[]) {return false; }
bool SkXMLParser::onAddAttribute(const char name[], const char value[]) {return false; }
bool SkXMLParser::onEndElement(const char elem[]) { return false; }
bool SkXMLParser::onText(const char text[], int len) {return false; }
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