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/*
* This file is part of libdom.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2007 John-Mark Bell <jmb@netsurf-browser.org>
*/
#include <stdbool.h>
#include <libxml/parser.h>
#include <libxml/SAX2.h>
#include <libxml/xmlerror.h>
#include <dom/dom.h>
#include "xmlerror.h"
#include "xmlparser.h"
#include "utils.h"
/**
* XML parser object
*/
struct xml_parser {
xmlParserCtxtPtr xml_ctx; /**< libxml parser context */
struct dom_document *doc; /**< DOM Document we're building */
bool complete; /**< Indicate stream completion */
xml_alloc alloc; /**< Memory (de)allocation function */
void *pw; /**< Pointer to client data */
};
/**
* SAX callback dispatch table
*/
static xmlSAXHandler sax_handler;
#if 0
= {
internalSubsetSAXFunc internalSubset;
isStandaloneSAXFunc isStandalone;
hasInternalSubsetSAXFunc hasInternalSubset;
hasExternalSubsetSAXFunc hasExternalSubset;
resolveEntitySAXFunc resolveEntity;
getEntitySAXFunc getEntity;
entityDeclSAXFunc entityDecl;
notationDeclSAXFunc notationDecl;
attributeDeclSAXFunc attributeDecl;
elementDeclSAXFunc elementDecl;
unparsedEntityDeclSAXFunc unparsedEntityDecl;
setDocumentLocatorSAXFunc setDocumentLocator;
startDocumentSAXFunc startDocument;
endDocumentSAXFunc endDocument;
startElementSAXFunc startElement;
endElementSAXFunc endElement;
referenceSAXFunc reference;
charactersSAXFunc characters;
ignorableWhitespaceSAXFunc ignorableWhitespace;
processingInstructionSAXFunc processingInstruction;
commentSAXFunc comment;
warningSAXFunc warning;
errorSAXFunc error;
fatalErrorSAXFunc fatalError; /* unused error() get all the errors */
getParameterEntitySAXFunc getParameterEntity;
cdataBlockSAXFunc cdataBlock;
externalSubsetSAXFunc externalSubset;
unsigned int initialized;
/* The following fields are extensions available only on version 2 */
void *_private;
startElementNsSAX2Func startElementNs;
endElementNsSAX2Func endElementNs;
xmlStructuredErrorFunc serror;
};
#endif
/**
* Create an XML parser instance
*
* \param enc Source charset, or NULL
* \param int_enc Desired charset of document buffer (UTF-8 or UTF-16)
* \param alloc Memory (de)allocation function
* \param pw Pointer to client-specific private data
* \return Pointer to instance, or NULL on memory exhaustion
*
* Neither ::enc nor ::int_enc are used here.
* libxml only supports a UTF-8 document buffer and forcibly setting the
* parser encoding is not yet implemented
*/
xml_parser *xml_parser_create(const char *enc, const char *int_enc,
xml_alloc alloc, void *pw)
{
xml_parser *parser;
UNUSED(enc);
UNUSED(int_enc);
parser = alloc(NULL, sizeof(xml_parser), pw);
if (parser == NULL)
return NULL;
parser->xml_ctx =
xmlCreatePushParserCtxt(&sax_handler, parser, "", 0,
NULL);
if (parser->xml_ctx == NULL) {
alloc(parser, 0, pw);
return NULL;
}
parser->doc = NULL;
parser->complete = false;
parser->alloc = alloc;
parser->pw = pw;
return parser;
}
/**
* Destroy an XML parser instance
*
* \param parser The parser instance to destroy
*/
void xml_parser_destroy(xml_parser *parser)
{
xmlFreeParserCtxt(parser->xml_ctx);
/** \todo Do we want to clean up the document here, too? */
/* Obviously, document cleanup wouldn't happen if the client has
* claimed the document from us via xml_parser_get_document() */
parser->alloc(parser, 0, parser->pw);
}
/**
* Parse a chunk of data
*
* \param parser The XML parser instance to use for parsing
* \param data Pointer to data chunk
* \param len Byte length of data chunk
* \return XML_OK on success, XML_LIBXML_ERR | <libxml error> on failure
*/
xml_error xml_parser_parse_chunk(xml_parser *parser,
uint8_t *data, size_t len)
{
xmlParserErrors err;
err = xmlParseChunk(parser->xml_ctx, (char *) data, len, 0);
if (err != XML_ERR_OK)
return XML_LIBXML_ERR | err;
return XML_OK;
}
/**
* Notify parser that datastream is empty
*
* \param parser The XML parser instance to notify
* \return XML_OK on success, XML_LIBXML_ERR | <libxml error> on failure
*
* This will force any remaining data through the parser
*/
xml_error xml_parser_completed(xml_parser *parser)
{
xmlParserErrors err;
err = xmlParseChunk(parser->xml_ctx, "", 0, 1);
if (err != XML_ERR_OK)
return XML_LIBXML_ERR | err;
parser->complete = true;
return XML_OK;
}
/**
* Retrieve the created DOM Document from a parser
*
* \param parser The parser instance to retrieve the document from
* \return Pointer to document, or NULL if parsing is not complete
*
* This may only be called after xml_parser_completed().
*/
struct dom_document *xml_parser_get_document(xml_parser *parser)
{
return (parser->complete ? parser->doc : NULL);
}
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