mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-30 18:23:08 +03:00
313 lines
8.4 KiB
C
313 lines
8.4 KiB
C
/*
|
|
* Copyright 2007 James Bursa <bursa@users.sourceforge.net>
|
|
* Copyright 2008 John-Mark Bell <jmb@netsurf-browser.org>
|
|
*
|
|
* This file is part of NetSurf, http://www.netsurf-browser.org/
|
|
*
|
|
* NetSurf 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; version 2 of the License.
|
|
*
|
|
* NetSurf 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef WITH_HUBBUB
|
|
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
|
|
#include <libxml/HTMLparser.h>
|
|
#include <libxml/HTMLtree.h>
|
|
#include <libxml/parser.h>
|
|
#include <libxml/parserInternals.h>
|
|
|
|
#include "render/parser_binding.h"
|
|
|
|
#include "utils/log.h"
|
|
#include "utils/talloc.h"
|
|
|
|
typedef struct libxml_ctx {
|
|
htmlParserCtxt *parser;
|
|
|
|
/** HTML parser encoding handler. */
|
|
xmlCharEncodingHandler *encoding_handler;
|
|
|
|
const char *encoding;
|
|
binding_encoding_source encoding_source;
|
|
|
|
bool getenc;
|
|
} libxml_ctx;
|
|
|
|
static bool set_parser_encoding(libxml_ctx *c, const char *encoding);
|
|
static const char *detect_encoding(const char **data, size_t *size);
|
|
|
|
binding_error binding_create_tree(void *arena, const char *charset, void **ctx)
|
|
{
|
|
libxml_ctx *c;
|
|
|
|
c = malloc(sizeof(libxml_ctx));
|
|
if (c == NULL)
|
|
return BINDING_NOMEM;
|
|
|
|
c->parser = NULL;
|
|
c->encoding_handler = NULL;
|
|
c->encoding = charset;
|
|
c->encoding_source = ENCODING_SOURCE_HEADER;
|
|
c->getenc = true;
|
|
|
|
c->parser = htmlCreatePushParserCtxt(0, 0, "", 0, 0,
|
|
XML_CHAR_ENCODING_NONE);
|
|
if (c->parser == NULL) {
|
|
free(c);
|
|
return BINDING_NOMEM;
|
|
}
|
|
|
|
if (c->encoding != NULL && !set_parser_encoding(c, charset)) {
|
|
if (c->parser->myDoc != NULL)
|
|
xmlFreeDoc(c->parser->myDoc);
|
|
htmlFreeParserCtxt(c->parser);
|
|
free(c);
|
|
return BINDING_BADENCODING;
|
|
}
|
|
|
|
*ctx = (void *) c;
|
|
|
|
return BINDING_OK;
|
|
}
|
|
|
|
binding_error binding_destroy_tree(void *ctx)
|
|
{
|
|
libxml_ctx *c = (libxml_ctx *) ctx;
|
|
|
|
if (ctx == NULL)
|
|
return BINDING_OK;
|
|
|
|
if (c->parser->myDoc != NULL)
|
|
xmlFreeDoc(c->parser->myDoc);
|
|
|
|
if (c->parser != NULL)
|
|
htmlFreeParserCtxt(c->parser);
|
|
|
|
c->parser = NULL;
|
|
c->encoding = NULL;
|
|
|
|
free(c);
|
|
|
|
return BINDING_OK;
|
|
}
|
|
|
|
binding_error binding_parse_chunk(void *ctx, const uint8_t *data, size_t len)
|
|
{
|
|
libxml_ctx *c = (libxml_ctx *) ctx;
|
|
|
|
if (c->getenc) {
|
|
/* No encoding was specified in the Content-Type header.
|
|
* Attempt to detect if the encoding is not 8-bit. If the
|
|
* encoding is 8-bit, leave the parser unchanged, so that it
|
|
* searches for a <meta http-equiv="content-type"
|
|
* content="text/html; charset=...">. */
|
|
const char *encoding;
|
|
encoding = detect_encoding((const char **) (void *) &data,
|
|
&len);
|
|
if (encoding) {
|
|
if (!set_parser_encoding(c, encoding))
|
|
return BINDING_NOMEM;
|
|
c->encoding = encoding;
|
|
c->encoding_source = ENCODING_SOURCE_DETECTED;
|
|
}
|
|
c->getenc = false;
|
|
|
|
/* The data we received may have solely consisted of a BOM.
|
|
* If so, it will have been stripped by html_detect_encoding.
|
|
* Therefore, we'll have nothing to do in that case. */
|
|
if (len == 0)
|
|
return BINDING_OK;
|
|
}
|
|
|
|
htmlParseChunk(c->parser, (const char *) data, len, 0);
|
|
/** \todo error handling */
|
|
|
|
if (!c->encoding && c->parser->input->encoding) {
|
|
/* The encoding was not in headers or detected,
|
|
* and the parser found a <meta http-equiv="content-type"
|
|
* content="text/html; charset=...">. */
|
|
|
|
/* However, if that encoding is non-ASCII-compatible,
|
|
* ignore it, as it can't possibly be correct */
|
|
if (strncasecmp((const char *) c->parser->input->encoding,
|
|
"UTF-16", 6) == 0 || /* UTF-16(LE|BE)? */
|
|
strncasecmp((const char *) c->parser->input->encoding,
|
|
"UTF-32", 6) == 0) { /* UTF-32(LE|BE)? */
|
|
c->encoding = "ISO-8859-1";
|
|
c->encoding_source = ENCODING_SOURCE_DETECTED;
|
|
} else {
|
|
c->encoding = (const char *) c->parser->input->encoding;
|
|
c->encoding_source = ENCODING_SOURCE_META;
|
|
}
|
|
|
|
if (!c->encoding)
|
|
return BINDING_NOMEM;
|
|
|
|
/* have the encoding; don't attempt to detect it */
|
|
c->getenc = false;
|
|
|
|
return BINDING_ENCODINGCHANGE;
|
|
}
|
|
|
|
return BINDING_OK;
|
|
}
|
|
|
|
binding_error binding_parse_completed(void *ctx)
|
|
{
|
|
libxml_ctx *c = (libxml_ctx *) ctx;
|
|
|
|
htmlParseChunk(c->parser, "", 0, 1);
|
|
/** \todo error handling */
|
|
|
|
return BINDING_OK;
|
|
}
|
|
|
|
const char *binding_get_encoding(void *ctx, binding_encoding_source *source)
|
|
{
|
|
libxml_ctx *c = (libxml_ctx *) ctx;
|
|
|
|
*source = c->encoding_source;
|
|
|
|
return c->encoding;
|
|
}
|
|
|
|
xmlDocPtr binding_get_document(void *ctx)
|
|
{
|
|
libxml_ctx *c = (libxml_ctx *) ctx;
|
|
xmlDocPtr doc = c->parser->myDoc;
|
|
|
|
c->parser->myDoc = NULL;
|
|
|
|
return doc;
|
|
}
|
|
|
|
/******************************************************************************/
|
|
|
|
/**
|
|
* Set the HTML parser character encoding.
|
|
*
|
|
* \param c context
|
|
* \param encoding name of encoding
|
|
* \return true on success, false on error and error reported
|
|
*/
|
|
bool set_parser_encoding(libxml_ctx *c, const char *encoding)
|
|
{
|
|
xmlError *error;
|
|
|
|
c->encoding_handler = xmlFindCharEncodingHandler(encoding);
|
|
if (!c->encoding_handler) {
|
|
/* either out of memory, or no handler available */
|
|
/* assume no handler available, which is not a fatal error */
|
|
LOG(("no encoding handler for \"%s\"", encoding));
|
|
/* \todo warn user and ask them to install iconv? */
|
|
return true;
|
|
}
|
|
|
|
xmlCtxtResetLastError(c->parser);
|
|
if (xmlSwitchToEncoding(c->parser, c->encoding_handler)) {
|
|
error = xmlCtxtGetLastError(c->parser);
|
|
LOG(("xmlSwitchToEncoding(): %s",
|
|
error ? error->message : "failed"));
|
|
return false;
|
|
}
|
|
|
|
/* Dirty hack to get around libxml oddness:
|
|
* 1) When creating a push parser context, the input flow's encoding
|
|
* string is not set (whether an encoding is specified or not)
|
|
* 2) When switching encoding (as above), the input flow's encoding
|
|
* string is never changed
|
|
* 3) When handling a meta charset, the input flow's encoding string
|
|
* is checked to determine if an encoding has already been set.
|
|
* If it has been set, then the meta charset is ignored.
|
|
*
|
|
* The upshot of this is that, if we don't explicitly set the input
|
|
* flow's encoding string here, any meta charset in the document
|
|
* will override our setting, which is incorrect behaviour.
|
|
*
|
|
* Ideally, this would be fixed in libxml, but that requires rather
|
|
* more knowledge than I currently have of what libxml is doing.
|
|
*/
|
|
if (!c->parser->input->encoding)
|
|
c->parser->input->encoding =
|
|
xmlStrdup((const xmlChar *) encoding);
|
|
|
|
/* Ensure noone else attempts to reset the encoding */
|
|
c->getenc = false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Attempt to detect the encoding of some HTML data.
|
|
*
|
|
* \param data Pointer to HTML source data
|
|
* \param size Pointer to length of data
|
|
* \return a constant string giving the encoding, or 0 if the encoding
|
|
* appears to be some 8-bit encoding
|
|
*
|
|
* If a BOM is encountered, *data and *size will be modified to skip over it
|
|
*/
|
|
|
|
const char *detect_encoding(const char **data, size_t *size)
|
|
{
|
|
const unsigned char *d = (const unsigned char *) *data;
|
|
|
|
/* this detection assumes that the first two characters are <= 0xff */
|
|
if (*size < 4)
|
|
return 0;
|
|
|
|
if (d[0] == 0x00 && d[1] == 0x00 &&
|
|
d[2] == 0xfe && d[3] == 0xff) { /* BOM 00 00 fe ff */
|
|
*data += 4;
|
|
*size -= 4;
|
|
return "UTF-32BE";
|
|
} else if (d[0] == 0xff && d[1] == 0xfe &&
|
|
d[2] == 0x00 && d[3] == 0x00) { /* BOM ff fe 00 00 */
|
|
*data += 4;
|
|
*size -= 4;
|
|
return "UTF-32LE";
|
|
}
|
|
else if (d[0] == 0x00 && d[1] != 0x00 &&
|
|
d[2] == 0x00 && d[3] != 0x00) /* 00 xx 00 xx */
|
|
return "UTF-16BE";
|
|
else if (d[0] != 0x00 && d[1] == 0x00 &&
|
|
d[2] != 0x00 && d[3] == 0x00) /* xx 00 xx 00 */
|
|
return "UTF-16LE";
|
|
else if (d[0] == 0x00 && d[1] == 0x00 &&
|
|
d[2] == 0x00 && d[3] != 0x00) /* 00 00 00 xx */
|
|
return "ISO-10646-UCS-4";
|
|
else if (d[0] != 0x00 && d[1] == 0x00 &&
|
|
d[2] == 0x00 && d[3] == 0x00) /* xx 00 00 00 */
|
|
return "ISO-10646-UCS-4";
|
|
else if (d[0] == 0xfe && d[1] == 0xff) { /* BOM fe ff */
|
|
*data += 2;
|
|
*size -= 2;
|
|
return "UTF-16BE";
|
|
} else if (d[0] == 0xff && d[1] == 0xfe) { /* BOM ff fe */
|
|
*data += 2;
|
|
*size -= 2;
|
|
return "UTF-16LE";
|
|
} else if (d[0] == 0xef && d[1] == 0xbb &&
|
|
d[2] == 0xbf) { /* BOM ef bb bf */
|
|
*data += 3;
|
|
*size -= 3;
|
|
return "UTF-8";
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|