pjs/network/main/prefetch.c

152 строки
3.8 KiB
C

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/* designed/implemented by Gagan Saksena */
#include "mkutils.h"
#include "xp.h"
#include "prefetch.h"
#include "net.h"
#include "xp_list.h"
#include "prefapi.h"
PRIVATE XP_List* prefetch_list = 0;
MODULE_PRIVATE Bool pre_OKToPrefetch(char* url);
MODULE_PRIVATE void pre_Finished(URL_Struct* url_struct, int status, MWContext* context);
PRIVATE XP_Bool pre_enabled = TRUE;
PRIVATE void pre_ProcessList(MWContext* context);
/* Constructs a URL_Struct from the the specified URL to the prefetch_list based
on the value of the pre subtag.
*/
PUBLIC void
PRE_AddToList(MWContext* context, char* url)
{
/* Construct a new URL_Struct with this url, and Prefetch priority */
URL_Struct* urls;
if (!pre_enabled || !pre_OKToPrefetch(url))
return;
urls = NET_CreateURLStruct(url, NET_DONT_RELOAD);
if (!urls)
return;
urls->priority = Prefetch_priority;
urls->load_background = TRUE;
if (prefetch_list == NULL)
{
prefetch_list = XP_ListNew();
}
XP_ListAddObjectToEnd(prefetch_list, urls);
}
/* The main process for each MWContext, should be called after
a page is finished loading. This basically extracts all the
links on the current page and eliminates the non relevant ones
and adds the elements to the prefetch_list. If something
has been added, then it is passed on to NET_GetURL function
for prefetching and storing in cache.
*/
PUBLIC void
PRE_Fetch(MWContext* context)
{
pre_ProcessList(context);
}
/* Returns bool to indicate if its OK to prefetch the specified URL.
we don't prefetch mailto:, file:, etc.
*/
PRIVATE Bool
pre_OKToPrefetch(char* url)
{
int type;
if (url == NULL)
return FALSE;
/* Skip interpreted cgi-bin's for now... */
if (PL_strchr(url, '?') ||
PL_strstr(url, "cgi-bin") ||
PL_strstr(url, ".cgi") ||
PL_strstr(url, ".shtml"))
return FALSE;
/* approve only HTTP and Gopher for now (skip about:/mailto:/telnet:/gopher:/ etc.) */
/* TODO add FTP directories only! */
type = NET_URL_Type(url);
if (type && (
(type == HTTP_TYPE_URL) ||
(type == GOPHER_TYPE_URL)))
return TRUE;
return FALSE;
}
PRIVATE void
pre_Finished(URL_Struct* url_struct, int status, MWContext* context)
{
/* this should change to update the colors of
the prefetched links */
if (prefetch_list)
{
XP_ListRemoveObject(prefetch_list, url_struct);
if (XP_ListCount(prefetch_list) == 0)
{
XP_ListDestroy(prefetch_list);
prefetch_list = 0;
}
}
XP_FREEIF(url_struct);
}
PRIVATE void
pre_ProcessList(MWContext* context)
{
if (XP_ListCount(prefetch_list)>0)
{
URL_Struct* urls;
XP_List* pList = prefetch_list;
while ((urls = (URL_Struct*)XP_ListNextObject(pList)))
{
NET_GetURL(urls,
FO_CACHE_ONLY,
context,
pre_Finished);
}
}
}
/* Enable or disable the prefetching, called from NET_SetupPrefs in mkgeturl.c */
PUBLIC void
PRE_Enable(PRUint8 nNumber)
{
if (nNumber > 0)
{
pre_enabled = TRUE;
/* TODO - set max number here */
}
else
pre_enabled = FALSE;
}