netsurf/content/content_factory.c

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/*
* Copyright 2011 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/>.
*/
/** \file
* Content factory (implementation)
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "content/content.h"
#include "content/content_factory.h"
#include "content/content_protected.h"
#include "content/llcache.h"
/**
* Entry in list of content handlers
*/
typedef struct content_handler_entry {
/** Next entry */
struct content_handler_entry *next;
/** MIME type handled by handler */
lwc_string *mime_type;
/** Content handler object */
const content_handler *handler;
} content_handler_entry;
static content_handler_entry *content_handlers;
/**
* Clean up after the content factory
*/
void content_factory_fini(void)
{
content_handler_entry *victim;
while (content_handlers != NULL) {
victim = content_handlers;
content_handlers = content_handlers->next;
if (victim->handler->fini != NULL)
victim->handler->fini();
lwc_string_unref(victim->mime_type);
free(victim);
}
}
/**
* Register a handler with the content factory
*
* \param mime_type MIME type to handle
* \param handler Content handler for MIME type
* \return NSERROR_OK on success, appropriate error otherwise
*
* \note Latest registration for a MIME type wins
*/
nserror content_factory_register_handler(const char *mime_type,
const content_handler *handler)
{
lwc_string *imime_type;
lwc_error lerror;
content_handler_entry *entry;
bool match;
lerror = lwc_intern_string(mime_type, strlen(mime_type), &imime_type);
if (lerror != lwc_error_ok)
return NSERROR_NOMEM;
for (entry = content_handlers; entry != NULL; entry = entry->next) {
if (lwc_string_caseless_isequal(imime_type, entry->mime_type,
&match) == lwc_error_ok && match)
break;
}
if (entry == NULL) {
entry = malloc(sizeof(content_handler_entry));
if (entry == NULL)
return NSERROR_NOMEM;
entry->next = content_handlers;
content_handlers = entry;
entry->mime_type = imime_type;
} else {
lwc_string_unref(imime_type);
}
entry->handler = handler;
return NSERROR_OK;
}
/**
* Find a handler for a MIME type.
*
* \param mime_type MIME type to search for
* \return Associated handler, or NULL if none
*/
static const content_handler *content_lookup(lwc_string *mime_type)
{
content_handler_entry *entry;
bool match;
for (entry = content_handlers; entry != NULL; entry = entry->next) {
if (lwc_string_caseless_isequal(mime_type, entry->mime_type,
&match) == lwc_error_ok && match)
break;
}
if (entry != NULL)
return entry->handler;
return NULL;
}
/**
* Compute the generic content type for a MIME type
*
* \param mime_type MIME type to consider
* \return Generic content type
*/
content_type content_factory_type_from_mime_type(lwc_string *mime_type)
{
const content_handler *handler;
content_type type = CONTENT_NONE;
handler = content_lookup(mime_type);
if (handler != NULL) {
type = handler->type();
}
return type;
}
/**
* Create a content object
*
* \param llcache Underlying source data handle
* \param fallback_charset Character set to fall back to if none specified
* \param quirks Quirkiness of containing document
* \param effective_type Effective MIME type of content
* \return Pointer to content object, or NULL on failure
*/
struct content *content_factory_create_content(llcache_handle *llcache,
const char *fallback_charset, bool quirks,
lwc_string *effective_type)
{
struct content *c;
const char *content_type_header;
const content_handler *handler;
http_content_type *ct = NULL;
nserror error;
handler = content_lookup(effective_type);
if (handler == NULL)
return NULL;
assert(handler->create != NULL);
/* Use the parameters from the declared Content-Type header */
content_type_header =
llcache_handle_get_header(llcache, "Content-Type");
if (content_type_header != NULL) {
/* We don't care if this fails */
http_parse_content_type(content_type_header, &ct);
}
error = handler->create(handler, effective_type,
ct != NULL ? ct->parameters : NULL,
llcache, fallback_charset, quirks,
&c);
if (ct != NULL)
http_content_type_destroy(ct);
if (error != NSERROR_OK)
return NULL;
return c;
}