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netsurf/render/html.c
James Bursa eaf8a13653 Remove incorrect comment. 
svn path=/trunk/netsurf/; revision=2513
2006-04-09 16:22:07 +00:00

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
*/
/** \file
* Content for text/html (implementation).
*/
#include <assert.h>
#include <ctype.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include "libxml/parserInternals.h"
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/content/fetch.h"
#include "netsurf/content/fetchcache.h"
#include "netsurf/desktop/browser.h"
#include "netsurf/desktop/gui.h"
#include "netsurf/desktop/options.h"
#include "netsurf/render/box.h"
#include "netsurf/render/font.h"
#include "netsurf/render/html.h"
#include "netsurf/render/imagemap.h"
#include "netsurf/render/layout.h"
#include "netsurf/utils/log.h"
#include "netsurf/utils/messages.h"
#include "netsurf/utils/talloc.h"
#include "netsurf/utils/url.h"
#include "netsurf/utils/utils.h"
#define CHUNK 4096
static bool html_set_parser_encoding(struct content *c, const char *encoding);
static const char *html_detect_encoding(const char *data, unsigned int size);
static void html_convert_css_callback(content_msg msg, struct content *css,
intptr_t p1, intptr_t p2, union content_msg_data data);
static bool html_meta_refresh(struct content *c, xmlNode *head);
static bool html_head(struct content *c, xmlNode *head);
static bool html_find_stylesheets(struct content *c, xmlNode *head);
static void html_object_callback(content_msg msg, struct content *object,
intptr_t p1, intptr_t p2, union content_msg_data data);
static void html_object_done(struct box *box, struct content *object,
bool background);
static void html_object_failed(struct box *box, struct content *content,
bool background);
static bool html_object_type_permitted(const content_type type,
const content_type *permitted_types);
static void html_object_refresh(void *p);
static bool html_find_frame(struct content *c, const char *frame,
struct content **page, unsigned int *i);
/**
* Create a CONTENT_HTML.
*
* The content_html_data structure is initialized and the HTML parser is
* created.
*/
bool html_create(struct content *c, const char *params[])
{
unsigned int i;
struct content_html_data *html = &c->data.html;
union content_msg_data msg_data;
html->parser = 0;
html->encoding_handler = 0;
html->encoding = 0;
html->getenc = true;
html->base_url = c->url;
html->layout = 0;
html->background_colour = TRANSPARENT;
html->stylesheet_count = 0;
html->stylesheet_content = 0;
html->style = 0;
html->working_stylesheet = 0;
html->object_count = 0;
html->object = 0;
html->forms = 0;
html->imagemaps = 0;
html->bw = 0;
html->page = 0;
html->index = 0;
html->box = 0;
for (i = 0; params[i]; i += 2) {
if (strcasecmp(params[i], "charset") == 0) {
html->encoding = talloc_strdup(c, params[i + 1]);
if (!html->encoding)
goto no_memory;
html->encoding_source = ENCODING_SOURCE_HEADER;
html->getenc = false;
break;
}
}
html->parser = htmlCreatePushParserCtxt(0, 0, "", 0, 0,
XML_CHAR_ENCODING_NONE);
if (!html->parser)
goto no_memory;
if (html->encoding) {
/* an encoding was specified in the Content-Type header */
if (!html_set_parser_encoding(c, html->encoding))
return false;
}
return true;
no_memory:
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
warn_user("NoMemory", 0);
return false;
}
/**
* Process data for CONTENT_HTML.
*
* The data is parsed in chunks of size CHUNK, multitasking in between.
*/
bool html_process_data(struct content *c, char *data, unsigned int size)
{
unsigned long x;
if (c->data.html.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 = html_detect_encoding(data, size);
if (encoding) {
if (!html_set_parser_encoding(c, encoding))
return false;
c->data.html.encoding = talloc_strdup(c, encoding);
if (!c->data.html.encoding)
return false;
c->data.html.encoding_source =
ENCODING_SOURCE_DETECTED;
}
c->data.html.getenc = false;
}
for (x = 0; x + CHUNK <= size; x += CHUNK) {
htmlParseChunk(c->data.html.parser, data + x, CHUNK, 0);
gui_multitask();
}
htmlParseChunk(c->data.html.parser, data + x, (int) (size - x), 0);
return true;
}
/**
* Set the HTML parser character encoding.
*
* \param c content of type CONTENT_HTML
* \param encoding name of encoding
* \return true on success, false on error and error reported
*/
bool html_set_parser_encoding(struct content *c, const char *encoding)
{
struct content_html_data *html = &c->data.html;
xmlError *error;
char error_message[500];
union content_msg_data msg_data;
html->encoding_handler = xmlFindCharEncodingHandler(encoding);
if (!html->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(html->parser);
if (xmlSwitchToEncoding(html->parser, html->encoding_handler)) {
error = xmlCtxtGetLastError(html->parser);
snprintf(error_message, sizeof error_message,
"%s xmlSwitchToEncoding(): %s",
messages_get("MiscError"),
error ? error->message : "failed");
msg_data.error = error_message;
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
return true;
}
/**
* Attempt to detect the encoding of some HTML data.
*
* \param data HTML source data
* \param size length of data
* \return a constant string giving the encoding, or 0 if the encoding
* appears to be some 8-bit encoding
*/
const char *html_detect_encoding(const char *data, unsigned int size)
{
/* this detection assumes that the first two characters are <= 0xff */
if (size < 4)
return 0;
if (data[0] == 0xfe && data[1] == 0xff) /* BOM fe ff */
return "UTF-16BE";
else if (data[0] == 0xfe && data[1] == 0xff) /* BOM ff fe */
return "UTF-16LE";
else if (data[0] == 0x00 && data[1] != 0x00 &&
data[2] == 0x00 && data[3] != 0x00) /* 00 xx 00 xx */
return "UTF-16BE";
else if (data[0] != 0x00 && data[1] == 0x00 &&
data[2] != 0x00 && data[3] == 0x00) /* xx 00 xx 00 */
return "UTF-16BE";
else if (data[0] == 0x00 && data[1] == 0x00 &&
data[2] == 0x00 && data[3] != 0x00) /* 00 00 00 xx */
return "ISO-10646-UCS-4";
else if (data[0] != 0x00 && data[1] == 0x00 &&
data[2] == 0x00 && data[3] == 0x00) /* xx 00 00 00 */
return "ISO-10646-UCS-4";
return 0;
}
/**
* Convert a CONTENT_HTML for display.
*
* The following steps are carried out in order:
*
* - parsing to an XML tree is completed
* - stylesheets are fetched
* - the XML tree is converted to a box tree and object fetches are started
* - the box tree is laid out
*
* On exit, the content status will be either CONTENT_STATUS_DONE if the
* document is completely loaded or CONTENT_STATUS_READY if objects are still
* being fetched.
*/
bool html_convert(struct content *c, int width, int height)
{
xmlDoc *document;
xmlNode *html, *head;
union content_msg_data msg_data;
/* finish parsing */
htmlParseChunk(c->data.html.parser, "", 0, 1);
document = c->data.html.parser->myDoc;
/*xmlDebugDumpDocument(stderr, c->data.html.parser->myDoc);*/
htmlFreeParserCtxt(c->data.html.parser);
c->data.html.parser = 0;
if (!document) {
LOG(("Parsing failed"));
msg_data.error = messages_get("ParsingFail");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
if (!c->data.html.encoding && document->encoding) {
/* The encoding was not in headers or detected, and the parser
* found a <meta http-equiv="content-type"
* content="text/html; charset=...">. */
c->data.html.encoding = talloc_strdup(c, document->encoding);
if (!c->data.html.encoding) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
c->data.html.encoding_source = ENCODING_SOURCE_META;
}
/* locate html and head elements */
for (html = document->children;
html != 0 && html->type != XML_ELEMENT_NODE;
html = html->next)
;
if (html == 0 || strcmp((const char *) html->name, "html") != 0) {
LOG(("html element not found"));
xmlFreeDoc(document);
msg_data.error = messages_get("ParsingFail");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
for (head = html->children;
head != 0 && head->type != XML_ELEMENT_NODE;
head = head->next)
;
if (head && strcmp((const char *) head->name, "head") != 0) {
head = 0;
LOG(("head element not found"));
}
if (head) {
if (!html_head(c, head)) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
/* handle meta refresh */
if (!html_meta_refresh(c, head))
return false;
}
/* get stylesheets */
if (!html_find_stylesheets(c, head)) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
/* convert xml tree to box tree */
LOG(("XML to box"));
content_set_status(c, messages_get("Processing"));
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
if (!xml_to_box(html, c)) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
/*box_dump(c->data.html.layout->children, 0);*/
/* extract image maps - can't do this sensibly in xml_to_box */
if (!imagemap_extract(html, c)) {
LOG(("imagemap extraction failed"));
msg_data.error = messages_get("NoMemory");
content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
return false;
}
/*imagemap_dump(c);*/
/* XML tree not required past this point */
xmlFreeDoc(document);
/* layout the box tree */
content_set_status(c, messages_get("Formatting"));
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
LOG(("Layout document"));
layout_document(c, width, height);
/*box_dump(c->data.html.layout->children, 0);*/
c->width = c->data.html.layout->descendant_x1;
c->height = c->data.html.layout->descendant_y1;
c->size = talloc_total_size(c);
if (c->active == 0) {
c->status = CONTENT_STATUS_DONE;
content_set_status(c, messages_get("Done"));
} else {
c->status = CONTENT_STATUS_READY;
content_set_status(c, messages_get("FetchObjs"), c->active);
}
return true;
}
/**
* Search for meta refresh
*
* http://wp.netscape.com/assist/net_sites/pushpull.html
*
* \param c content structure
* \param head xml node of head element
* \return true on success, false otherwise (error reported)
*/
bool html_meta_refresh(struct content *c, xmlNode *head)
{
xmlNode *n;
xmlChar *equiv, *content;
union content_msg_data msg_data;
char *url, *end, *refresh;
url_func_result res;
for (n = head == 0 ? 0 : head->children; n; n = n->next) {
if (n->type != XML_ELEMENT_NODE)
continue;
if (strcmp((const char *)n->name, "meta"))
continue;
equiv = xmlGetProp(n, (const xmlChar *)"http-equiv");
if (!equiv)
continue;
if (strcasecmp((const char *)equiv, "refresh")) {
xmlFree(equiv);
continue;
}
xmlFree(equiv);
content = xmlGetProp(n, (const xmlChar *)"content");
if (!content)
continue;
end = (char *)content + strlen(content);
msg_data.delay = (int)strtol((char *) content, &url, 10);
if (url == end) {
/* Just delay specified, so refresh current page */
xmlFree(content);
c->refresh = talloc_strdup(c, c->url);
if (!c->refresh) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c,
CONTENT_MSG_ERROR, msg_data);
return false;
}
content_broadcast(c, CONTENT_MSG_REFRESH, msg_data);
break;
}
for ( ; url <= end - 4; url++) {
if (!strncasecmp(url, "url=", 4))
break;
}
if (url <= end - 4) {
res = url_join(url + 4, c->data.html.base_url,
&refresh);
xmlFree(content);
if (res == URL_FUNC_NOMEM) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c,
CONTENT_MSG_ERROR, msg_data);
return false;
}
else if (res == URL_FUNC_FAILED) {
/* This isn't fatal so carry on looking */
continue;
}
c->refresh = talloc_strdup(c, refresh);
free(refresh);
if (!c->refresh) {
msg_data.error = messages_get("NoMemory");
content_broadcast(c,
CONTENT_MSG_ERROR, msg_data);
return false;
}
content_broadcast(c, CONTENT_MSG_REFRESH, msg_data);
break;
}
xmlFree(content);
}
return true;
}
/**
* Process elements in <head>.
*
* \param c content structure
* \param head xml node of head element
* \return true on success, false on memory exhaustion
*
* The title and base href are extracted if present.
*/
bool html_head(struct content *c, xmlNode *head)
{
xmlNode *node;
c->title = 0;
for (node = head->children; node != 0; node = node->next) {
if (node->type != XML_ELEMENT_NODE)
continue;
if (!c->title && strcmp(node->name, "title") == 0) {
xmlChar *title = xmlNodeGetContent(node);
if (!title)
return false;
char *title2 = squash_whitespace(title);
xmlFree(title);
if (!title2)
return false;
c->title = talloc_strdup(c, title2);
free(title2);
if (!c->title)
return false;
} else if (strcmp(node->name, "base") == 0) {
char *href = (char *) xmlGetProp(node,
(const xmlChar *) "href");
if (href) {
char *url;
url_func_result res;
res = url_normalize(href, &url);
if (res == URL_FUNC_OK) {
c->data.html.base_url =
talloc_strdup(c, url);
free(url);
}
xmlFree(href);
}
}
}
return true;
}
/**
* Process inline stylesheets and fetch linked stylesheets.
*
* \param c content structure
* \param head xml node of head element, or 0 if none
* \return true on success, false on memory exhaustion
*/
bool html_find_stylesheets(struct content *c, xmlNode *head)
{
xmlNode *node, *node2;
char *rel, *type, *media, *href, *data, *url;
unsigned int i = STYLESHEET_START;
unsigned int last_active = 0;
union content_msg_data msg_data;
url_func_result res;
struct content **stylesheet_content;
/* stylesheet 0 is the base style sheet,
* stylesheet 1 is the adblocking stylesheet,
* stylesheet 2 is any <style> elements */
c->data.html.stylesheet_content = talloc_array(c, struct content *,
STYLESHEET_START);
if (!c->data.html.stylesheet_content)
return false;
c->data.html.stylesheet_content[STYLESHEET_ADBLOCK] = 0;
c->data.html.stylesheet_content[STYLESHEET_STYLE] = 0;
c->data.html.stylesheet_count = STYLESHEET_START;
c->active = 0;
c->data.html.stylesheet_content[STYLESHEET_BASE] = fetchcache(
default_stylesheet_url,
html_convert_css_callback, (intptr_t) c,
STYLESHEET_BASE, c->width, c->height,
true, 0, 0, false, false);
if (!c->data.html.stylesheet_content[STYLESHEET_BASE])
return false;
c->active++;
fetchcache_go(c->data.html.stylesheet_content[STYLESHEET_BASE], 0,
html_convert_css_callback, (intptr_t) c,
STYLESHEET_BASE, c->width, c->height,
0, 0, false);
if (option_block_ads) {
c->data.html.stylesheet_content[STYLESHEET_ADBLOCK] =
fetchcache(adblock_stylesheet_url,
html_convert_css_callback, (intptr_t) c,
STYLESHEET_ADBLOCK, c->width,
c->height, true, 0, 0, false, false);
if (!c->data.html.stylesheet_content[STYLESHEET_ADBLOCK])
return false;
c->active++;
fetchcache_go(c->data.html.
stylesheet_content[STYLESHEET_ADBLOCK],
0, html_convert_css_callback, (intptr_t) c,
STYLESHEET_ADBLOCK, c->width,
c->height, 0, 0, false);
}
for (node = head == 0 ? 0 : head->children; node; node = node->next) {
if (node->type != XML_ELEMENT_NODE)
continue;
if (strcmp(node->name, "link") == 0) {
/* rel='stylesheet' */
if ((rel = (char *) xmlGetProp(node, (const xmlChar *) "rel")) == NULL)
continue;
if (strcasecmp(rel, "stylesheet") != 0) {
xmlFree(rel);
continue;
}
xmlFree(rel);
/* type='text/css' or not present */
if ((type = (char *) xmlGetProp(node, (const xmlChar *) "type")) != NULL) {
if (strcmp(type, "text/css") != 0) {
xmlFree(type);
continue;
}
xmlFree(type);
}
/* media contains 'screen' or 'all' or not present */
if ((media = (char *) xmlGetProp(node, (const xmlChar *) "media")) != NULL) {
if (strstr(media, "screen") == 0 &&
strstr(media, "all") == 0) {
xmlFree(media);
continue;
}
xmlFree(media);
}
/* href='...' */
if ((href = (char *) xmlGetProp(node, (const xmlChar *) "href")) == NULL)
continue;
/* TODO: only the first preferred stylesheets (ie. those with a
* title attribute) should be loaded (see HTML4 14.3) */
res = url_join(href, c->data.html.base_url, &url);
xmlFree(href);
if (res != URL_FUNC_OK)
continue;
LOG(("linked stylesheet %i '%s'", i, url));
/* start fetch */
stylesheet_content = talloc_realloc(c,
c->data.html.stylesheet_content,
struct content *, i + 1);
if (!stylesheet_content)
return false;
c->data.html.stylesheet_content = stylesheet_content;
c->data.html.stylesheet_content[i] = fetchcache(url,
html_convert_css_callback,
(intptr_t) c, i, c->width, c->height,
true, 0, 0, false, false);
if (!c->data.html.stylesheet_content[i])
return false;
c->active++;
fetchcache_go(c->data.html.stylesheet_content[i],
c->url,
html_convert_css_callback,
(intptr_t) c, i, c->width, c->height,
0, 0, false);
free(url);
i++;
} else if (strcmp(node->name, "style") == 0) {
/* type='text/css', or not present (invalid but common) */
if ((type = (char *) xmlGetProp(node, (const xmlChar *) "type")) != NULL) {
if (strcmp(type, "text/css") != 0) {
xmlFree(type);
continue;
}
xmlFree(type);
}
/* media contains 'screen' or 'all' or not present */
if ((media = (char *) xmlGetProp(node, (const xmlChar *) "media")) != NULL) {
if (strstr(media, "screen") == 0 &&
strstr(media, "all") == 0) {
xmlFree(media);
continue;
}
xmlFree(media);
}
/* create stylesheet */
LOG(("style element"));
if (c->data.html.stylesheet_content[STYLESHEET_STYLE] == 0) {
const char *params[] = { 0 };
c->data.html.stylesheet_content[STYLESHEET_STYLE] =
content_create(c->data.html.
base_url);
if (!c->data.html.stylesheet_content[STYLESHEET_STYLE])
return false;
if (!content_set_type(c->data.html.
stylesheet_content[STYLESHEET_STYLE],
CONTENT_CSS, "text/css",
params))
/** \todo not necessarily caused by
* memory exhaustion */
return false;
}
/* can't just use xmlNodeGetContent(node), because that won't give
* the content of comments which may be used to 'hide' the content */
for (node2 = node->children; node2 != 0; node2 = node2->next) {
data = xmlNodeGetContent(node2);
if (!content_process_data(c->data.html.
stylesheet_content[STYLESHEET_STYLE],
data, strlen(data))) {
xmlFree(data);
/** \todo not necessarily caused by
* memory exhaustion */
return false;
}
xmlFree(data);
}
}
}
c->data.html.stylesheet_count = i;
if (c->data.html.stylesheet_content[STYLESHEET_STYLE] != 0) {
if (css_convert(c->data.html.stylesheet_content[STYLESHEET_STYLE], c->width,
c->height)) {
if (!content_add_user(c->data.html.stylesheet_content[STYLESHEET_STYLE],
html_convert_css_callback,
(intptr_t) c, STYLESHEET_STYLE)) {
/* no memory */
c->data.html.stylesheet_content[STYLESHEET_STYLE] = 0;
return false;
}
} else {
/* conversion failed */
c->data.html.stylesheet_content[STYLESHEET_STYLE] = 0;
}
}
/* complete the fetches */
while (c->active != 0) {
if (c->active != last_active) {
content_set_status(c, messages_get("FetchStyle"),
c->active);
content_broadcast(c, CONTENT_MSG_STATUS, msg_data);
last_active = c->active;
}
fetch_poll();
gui_multitask();
}
/* if (c->error) { */
/* content_set_status(c, "Warning: some stylesheets failed to load"); */
/* content_broadcast(c, CONTENT_MSG_STATUS, msg_data); */
/* } */
/* any of our stylesheets pointers could be NULL at this point if the
CSS file(s) failed to load/fetch */
if (c->data.html.stylesheet_content[STYLESHEET_BASE])
css_set_origin(c->data.html.stylesheet_content[STYLESHEET_BASE],
CSS_ORIGIN_UA);
if (c->data.html.stylesheet_content[STYLESHEET_ADBLOCK])
css_set_origin(c->data.html.stylesheet_content[
STYLESHEET_ADBLOCK], CSS_ORIGIN_UA);
if (c->data.html.stylesheet_content[STYLESHEET_STYLE])
css_set_origin(c->data.html.stylesheet_content[
STYLESHEET_STYLE], CSS_ORIGIN_AUTHOR);
for (i = STYLESHEET_START; i != c->data.html.stylesheet_count; i++)
if (c->data.html.stylesheet_content[i])
css_set_origin(c->data.html.stylesheet_content[i],
CSS_ORIGIN_AUTHOR);
c->data.html.working_stylesheet = css_make_working_stylesheet(
c->data.html.stylesheet_content,
c->data.html.stylesheet_count);
if (!c->data.html.working_stylesheet)
return false;
return true;
}
/**
* Callback for fetchcache() for linked stylesheets.
*/
void html_convert_css_callback(content_msg msg, struct content *css,
intptr_t p1, intptr_t p2, union content_msg_data data)
{
struct content *c = (struct content *) p1;
unsigned int i = p2;
switch (msg) {
case CONTENT_MSG_LOADING:
/* check that the stylesheet is really CSS */
if (css->type != CONTENT_CSS) {
c->data.html.stylesheet_content[i] = 0;
c->active--;
content_add_error(c, "NotCSS", 0);
content_set_status(c, messages_get("NotCSS"));
content_broadcast(c, CONTENT_MSG_STATUS, data);
content_remove_user(css,
html_convert_css_callback,
(intptr_t) c, i);
if (!css->user_list) {
/* we were the only user and we
* don't want this content, so
* stop it fetching and mark it
* as having an error so it gets
* removed from the cache next time
* content_clean() gets called */
fetch_abort(css->fetch);
css->fetch = 0;
css->status = CONTENT_STATUS_ERROR;
}
}
break;
case CONTENT_MSG_READY:
break;
case CONTENT_MSG_DONE:
LOG(("got stylesheet '%s'", css->url));
c->active--;
break;
case CONTENT_MSG_ERROR:
c->data.html.stylesheet_content[i] = 0;
c->active--;
content_add_error(c, "?", 0);
break;
case CONTENT_MSG_STATUS:
content_set_status(c, messages_get("FetchStyle2"),
c->active, css->status_message);
content_broadcast(c, CONTENT_MSG_STATUS, data);
break;
case CONTENT_MSG_REDIRECT:
c->active--;
c->data.html.stylesheet_content[i] = fetchcache(
data.redirect,
html_convert_css_callback,
(intptr_t) c, i, css->width, css->height,
true, 0, 0, false, false);
if (c->data.html.stylesheet_content[i]) {
c->active++;
fetchcache_go(c->data.html.stylesheet_content[i],
c->url,
html_convert_css_callback,
(intptr_t) c, i, css->width,
css->height, 0, 0, false);
}
break;
case CONTENT_MSG_NEWPTR:
c->data.html.stylesheet_content[i] = css;
break;
#ifdef WITH_AUTH
case CONTENT_MSG_AUTH:
c->data.html.stylesheet_content[i] = 0;
c->active--;
content_add_error(c, "?", 0);
break;
#endif
#ifdef WITH_SSL
case CONTENT_MSG_SSL:
c->data.html.stylesheet_content[i] = 0;
c->active--;
content_add_error(c, "?", 0);
break;
#endif
default:
assert(0);
}
}
/**
* Start a fetch for an object required by a page.
*
* \param c content of type CONTENT_HTML
* \param url URL of object to fetch (copied)
* \param box box that will contain the object
* \param permitted_types array of types, terminated by CONTENT_UNKNOWN,
* or 0 if all types except OTHER and UNKNOWN acceptable
* \param available_width estimate of width of object
* \param available_height estimate of height of object
* \param background this is a background image
* \param frame name of frame, or 0 if not a frame (copied)
* \return true on success, false on memory exhaustion
*/
bool html_fetch_object(struct content *c, char *url, struct box *box,
const content_type *permitted_types,
int available_width, int available_height,
bool background, char *frame)
{
unsigned int i = c->data.html.object_count;
struct content_html_object *object;
struct content *c_fetch;
/* initialise fetch */
c_fetch = fetchcache(url, html_object_callback,
(intptr_t) c, i, available_width, available_height,
true, 0, 0, false, false);
if (!c_fetch)
return false;
/* add to object list */
object = talloc_realloc(c, c->data.html.object,
struct content_html_object, i + 1);
if (!object) {
content_remove_user(c_fetch, html_object_callback,
(intptr_t) c, i);
return false;
}
c->data.html.object = object;
c->data.html.object[i].url = talloc_strdup(c, url);
if (!c->data.html.object[i].url) {
content_remove_user(c_fetch, html_object_callback,
(intptr_t) c, i);
return false;
}
c->data.html.object[i].box = box;
c->data.html.object[i].permitted_types = permitted_types;
c->data.html.object[i].background = background;
c->data.html.object[i].content = c_fetch;
c->data.html.object[i].frame = 0;
if (frame)
c->data.html.object[i].frame = talloc_strdup(c, frame);
c->data.html.object_count++;
c->active++;
/* start fetch */
fetchcache_go(c_fetch, c->url,
html_object_callback, (intptr_t) c, i,
available_width, available_height,
0, 0, false);
return true;
}
/**
* Start a fetch for an object required by a page, replacing an existing object.
*
* \param c content of type CONTENT_HTML
* \param i index of object to replace in c->data.html.object
* \param url URL of object to fetch (copied)
* \param post_urlenc url encoded post data, or 0 if none
* \param post_multipart multipart post data, or 0 if none
* \return true on success, false on memory exhaustion
*/
bool html_replace_object(struct content *c, unsigned int i, char *url,
char *post_urlenc,
struct form_successful_control *post_multipart)
{
struct content *c_fetch;
struct content *page;
assert(c->type == CONTENT_HTML);
if (c->data.html.object[i].content) {
/* remove existing object */
if (c->data.html.object[i].content->status !=
CONTENT_STATUS_DONE)
c->active--;
content_remove_user(c->data.html.object[i].content,
html_object_callback, (intptr_t) c, i);
c->data.html.object[i].content = 0;
c->data.html.object[i].box->object = 0;
talloc_free(c->data.html.object[i].url);
c->data.html.object[i].url = 0;
}
/* initialise fetch */
c_fetch = fetchcache(url, html_object_callback,
(intptr_t) c, i,
c->data.html.object[i].box->width,
c->data.html.object[i].box->height,
false, post_urlenc, post_multipart, false, false);
if (!c_fetch)
return false;
c->data.html.object[i].url = talloc_strdup(c, url);
if (!c->data.html.object[i].url) {
content_remove_user(c_fetch, html_object_callback,
(intptr_t) c, i);
return false;
}
c->data.html.object[i].content = c_fetch;
for (page = c; page; page = page->data.html.page) {
assert(page->type == CONTENT_HTML);
page->active++;
page->status = CONTENT_STATUS_READY;
}
/* start fetch */
fetchcache_go(c_fetch, c->url,
html_object_callback, (intptr_t) c, i,
c->data.html.object[i].box->width,
c->data.html.object[i].box->height,
post_urlenc, post_multipart, false);
return true;
}
/**
* Callback for fetchcache() for objects.
*/
void html_object_callback(content_msg msg, struct content *object,
intptr_t p1, intptr_t p2, union content_msg_data data)
{
struct content *c = (struct content *) p1;
unsigned int i = p2;
int x, y;
struct box *box = c->data.html.object[i].box;
switch (msg) {
case CONTENT_MSG_LOADING:
/* check if the type is acceptable for this object */
if (html_object_type_permitted(object->type,
c->data.html.object[i].permitted_types)) {
if (c->data.html.bw)
content_open(object,
c->data.html.bw, c,
i, box,
box->object_params);
break;
}
/* not acceptable */
c->data.html.object[i].content = 0;
c->active--;
content_add_error(c, "?", 0);
content_set_status(c, messages_get("BadObject"));
content_broadcast(c, CONTENT_MSG_STATUS, data);
content_remove_user(object, html_object_callback,
(intptr_t) c, i);
html_object_failed(box, c,
c->data.html.object[i].background);
break;
case CONTENT_MSG_READY:
if (object->type == CONTENT_HTML) {
html_object_done(box, object,
c->data.html.object[i].background);
if (c->status == CONTENT_STATUS_READY ||
c->status ==
CONTENT_STATUS_DONE)
content_reformat(c,
c->available_width, 0);
}
break;
case CONTENT_MSG_DONE:
html_object_done(box, object,
c->data.html.object[i].background);
c->active--;
break;
case CONTENT_MSG_ERROR:
c->data.html.object[i].content = 0;
c->active--;
content_add_error(c, "?", 0);
content_set_status(c, messages_get("ObjError"),
data.error);
content_broadcast(c, CONTENT_MSG_STATUS, data);
html_object_failed(box, c,
c->data.html.object[i].background);
break;
case CONTENT_MSG_STATUS:
content_set_status(c, messages_get("FetchObjs2"),
c->active, object->status_message);
/* content_broadcast(c, CONTENT_MSG_STATUS, 0); */
break;
case CONTENT_MSG_REDIRECT:
c->active--;
talloc_free(c->data.html.object[i].url);
c->data.html.object[i].url = talloc_strdup(c,
data.redirect);
if (!c->data.html.object[i].url) {
/** \todo report oom */
} else {
c->data.html.object[i].content = fetchcache(
data.redirect,
html_object_callback,
(intptr_t) c, i, 0, 0, true,
0, 0, false, false);
if (!c->data.html.object[i].content) {
/** \todo report oom */
} else {
c->active++;
fetchcache_go(c->data.html.object[i].
content,
c->url,
html_object_callback,
(intptr_t) c, i,
0, 0,
0, 0, false);
}
}
break;
case CONTENT_MSG_REFORMAT:
break;
case CONTENT_MSG_REDRAW:
box_coords(box, &x, &y);
if (object == data.redraw.object) {
data.redraw.x = data.redraw.x *
box->width / object->width;
data.redraw.y = data.redraw.y *
box->height / object->height;
data.redraw.width = data.redraw.width *
box->width / object->width;
data.redraw.height = data.redraw.height *
box->height / object->height;
data.redraw.object_width = box->width;
data.redraw.object_height = box->height;
}
data.redraw.x += x + box->padding[LEFT];
data.redraw.y += y + box->padding[TOP];
data.redraw.object_x += x + box->padding[LEFT];
data.redraw.object_y += y + box->padding[TOP];
content_broadcast(c, CONTENT_MSG_REDRAW, data);
break;
case CONTENT_MSG_NEWPTR:
c->data.html.object[i].content = object;
break;
#ifdef WITH_AUTH
case CONTENT_MSG_AUTH:
c->data.html.object[i].content = 0;
c->active--;
content_add_error(c, "?", 0);
break;
#endif
#ifdef WITH_SSL
case CONTENT_MSG_SSL:
c->data.html.object[i].content = 0;
c->active--;
content_add_error(c, "?", 0);
break;
#endif
case CONTENT_MSG_REFRESH:
if (object->type == CONTENT_HTML)
/* only for HTML objects */
schedule(data.delay * 100,
html_object_refresh, object);
break;
default:
assert(0);
}
if (c->status == CONTENT_STATUS_READY && c->active == 0 &&
(msg == CONTENT_MSG_LOADING ||
msg == CONTENT_MSG_DONE ||
msg == CONTENT_MSG_ERROR ||
msg == CONTENT_MSG_REDIRECT ||
msg == CONTENT_MSG_AUTH)) {
/* all objects have arrived */
content_reformat(c, c->available_width, 0);
c->status = CONTENT_STATUS_DONE;
content_set_status(c, messages_get("Done"));
content_broadcast(c, CONTENT_MSG_DONE, data);
}
if (c->status == CONTENT_STATUS_READY)
content_set_status(c, messages_get("FetchObjs"), c->active);
}
/**
* Update a box whose content has completed rendering.
*/
void html_object_done(struct box *box, struct content *object,
bool background)
{
struct box *b;
if (background) {
box->background = object;
return;
}
box->object = object;
/* invalidate parent min, max widths */
for (b = box; b; b = b->parent)
b->max_width = UNKNOWN_MAX_WIDTH;
/* delete any clones of this box */
while (box->next && box->next->clone) {
/* box_free_box(box->next); */
box->next = box->next->next;
}
}
/**
* Handle object fetching or loading failure.
*
* \param box box containing object which failed to load
* \param content document of type CONTENT_HTML
* \param background the object was the background image for the box
*
* Any fallback content for the object is made visible.
*/
void html_object_failed(struct box *box, struct content *content,
bool background)
{
struct box *b, *ic;
if (background)
return;
if (!box->fallback)
return;
/* make fallback boxes into children or siblings, as appropriate */
if (box->type != BOX_INLINE) {
/* easy case: fallbacks become children */
assert(box->type == BOX_BLOCK ||
box->type == BOX_TABLE_CELL ||
box->type == BOX_INLINE_BLOCK);
box->children = box->fallback;
box->last = box->children;
while (box->last->next)
box->last = box->last->next;
box->fallback = 0;
box_normalise_block(box, content);
} else {
assert(box->parent->type == BOX_INLINE_CONTAINER);
if (box->fallback->type == BOX_INLINE_CONTAINER &&
!box->fallback->next) {
/* the fallback is a single inline container: splice
* it into this inline container */
for (b = box->fallback->children; b; b = b->next)
b->parent = box->parent;
box->fallback->last->next = box->next;
if (!box->next)
box->parent->last = box->fallback->last;
box->next = box->fallback->children;
box->next->prev = box;
box->fallback = 0;
} else {
if (box->next) {
/* split this inline container into two inline
* containers */
ic = box_create(0, 0, 0, 0, 0, content);
if (!ic) {
warn_user("NoMemory", 0);
return;
}
ic->type = BOX_INLINE_CONTAINER;
box_insert_sibling(box->parent, ic);
ic->children = box->next;
ic->last = box->parent->last;
ic->children->prev = 0;
box->next = 0;
box->parent->last = box;
for (b = ic->children; b; b = b->next)
b->parent = ic;
}
/* insert the fallback after the parent */
for (b = box->fallback; b->next; b = b->next)
b->parent = box->parent->parent;
b->parent = box->parent->parent;
/* [b is the last fallback box] */
b->next = box->parent->next;
if (b->next)
b->next->prev = b;
box->parent->next = box->fallback;
box->fallback->prev = box->parent;
box->fallback = 0;
box_normalise_block(box->parent->parent, content);
}
}
/* invalidate parent min, max widths */
for (b = box->parent; b; b = b->parent)
b->max_width = UNKNOWN_MAX_WIDTH;
box->width = UNKNOWN_WIDTH;
}
/**
* Check if a type is in a list.
*
* \param type the content_type to search for
* \param permitted_types array of types, terminated by CONTENT_UNKNOWN,
* or 0 if all types except OTHER and UNKNOWN acceptable
* \return the type is in the list or acceptable
*/
bool html_object_type_permitted(const content_type type,
const content_type *permitted_types)
{
if (permitted_types) {
for (; *permitted_types != CONTENT_UNKNOWN; permitted_types++)
if (*permitted_types == type)
return true;
} else if (type < CONTENT_OTHER) {
return true;
}
return false;
}
/**
* schedule() callback for object refresh
*/
void html_object_refresh(void *p)
{
struct content *c = (struct content *)p;
assert(c->type == CONTENT_HTML && c->refresh);
c->fresh = false;
if (!html_replace_object(c->data.html.page, c->data.html.index,
c->refresh, 0, 0)) {
/** \todo handle memory exhaustion */
}
}
/**
* Stop loading a CONTENT_HTML in state READY.
*/
void html_stop(struct content *c)
{
unsigned int i;
struct content *object;
assert(c->status == CONTENT_STATUS_READY);
for (i = 0; i != c->data.html.object_count; i++) {
object = c->data.html.object[i].content;
if (!object)
continue;
if (object->status == CONTENT_STATUS_DONE)
; /* already loaded: do nothing */
else if (object->status == CONTENT_STATUS_READY)
content_stop(object, html_object_callback,
(intptr_t) c, i);
else {
content_remove_user(c->data.html.object[i].content,
html_object_callback, (intptr_t) c, i);
c->data.html.object[i].content = 0;
}
}
c->status = CONTENT_STATUS_DONE;
}
/**
* Reformat a CONTENT_HTML to a new width.
*/
void html_reformat(struct content *c, int width, int height)
{
struct box *doc;
layout_document(c, width, height);
doc = c->data.html.layout;
c->width = doc->descendant_x1 +
doc->margin[LEFT] + doc->margin[RIGHT];
c->height = doc->descendant_y1 +
doc->margin[TOP] + doc->margin[BOTTOM];
}
/**
* Destroy a CONTENT_HTML and free all resources it owns.
*/
void html_destroy(struct content *c)
{
unsigned int i;
LOG(("content %p", c));
imagemap_destroy(c);
if (c->bitmap) {
bitmap_destroy(c->bitmap);
c->bitmap = NULL;
}
if (c->data.html.parser)
htmlFreeParserCtxt(c->data.html.parser);
/* Free stylesheets */
if (c->data.html.stylesheet_count) {
for (i = 0; i != c->data.html.stylesheet_count; i++) {
if (c->data.html.stylesheet_content[i])
content_remove_user(c->data.html.
stylesheet_content[i],
html_convert_css_callback,
(intptr_t) c, i);
}
}
talloc_free(c->data.html.working_stylesheet);
/*if (c->data.html.style)
css_free_style(c->data.html.style);*/
/* Free objects */
for (i = 0; i != c->data.html.object_count; i++) {
LOG(("object %i %p", i, c->data.html.object[i].content));
if (c->data.html.object[i].content) {
content_remove_user(c->data.html.object[i].content,
html_object_callback, (intptr_t) c, i);
if (c->data.html.object[i].content->type == CONTENT_HTML)
schedule_remove(html_object_refresh,
c->data.html.object[i].content);
}
}
}
/**
* Handle a window containing a CONTENT_HTML being opened.
*/
void html_open(struct content *c, struct browser_window *bw,
struct content *page, unsigned int index, struct box *box,
struct object_params *params)
{
unsigned int i;
c->data.html.bw = bw;
c->data.html.page = page;
c->data.html.index = index;
c->data.html.box = box;
for (i = 0; i != c->data.html.object_count; i++) {
if (c->data.html.object[i].content == 0)
continue;
if (c->data.html.object[i].content->type == CONTENT_UNKNOWN)
continue;
content_open(c->data.html.object[i].content,
bw, c, i,
c->data.html.object[i].box,
c->data.html.object[i].box->object_params);
}
}
/**
* Handle a window containing a CONTENT_HTML being closed.
*/
void html_close(struct content *c)
{
unsigned int i;
c->data.html.bw = 0;
schedule_remove(html_object_refresh, c);
for (i = 0; i != c->data.html.object_count; i++) {
if (c->data.html.object[i].content == 0)
continue;
if (c->data.html.object[i].content->type == CONTENT_UNKNOWN)
continue;
content_close(c->data.html.object[i].content);
}
}
/**
* Find the target frame for a link.
*
* \param c content containing the link, of type CONTENT_HTML
* \param target target frame
* \retval page updated to content containing target object, or 0 if the
* target should replace the top-level content
* \retval i updated to index of target object in page->data.html.object
*/
void html_find_target(struct content *c, const char *target,
struct content **page, unsigned int *i)
{
*page = 0;
assert(c->type == CONTENT_HTML);
if (!target) {
/** \todo get target from <base target=...> */
*page = c->data.html.page;
*i = c->data.html.index;
return;
}
if (target == TARGET_SELF) {
*page = c->data.html.page;
*i = c->data.html.index;
return;
} else if (target == TARGET_PARENT) {
if (c->data.html.page && c->data.html.page->data.html.page) {
*page = c->data.html.page->data.html.page;
*i = c->data.html.page->data.html.index;
}
return;
} else if (target == TARGET_TOP) {
return;
}
/* recursively search for a frame named target, starting with the
* top-level content in the frameset */
while (c->data.html.page)
c = c->data.html.page;
html_find_frame(c, target, page, i);
}
/**
* Recursively search a frameset for a frame.
*
* \param c frameset page, of type CONTENT_HTML
* \param frame name of frame
* \retval page updated to content containing the frame, if true returned
* \retval i updated to index of target frame in page->data.html.object
* \return true iff the frame was found
*/
bool html_find_frame(struct content *c, const char *frame,
struct content **page, unsigned int *i)
{
unsigned int j;
assert(c->type == CONTENT_HTML);
for (j = 0; j != c->data.html.object_count; j++) {
if (!strcmp(c->data.html.object[j].frame, frame)) {
*page = c;
*i = j;
return true;
}
if (c->data.html.object[j].content &&
c->data.html.object[j].content->type ==
CONTENT_HTML) {
if (html_find_frame(c->data.html.object[j].content,
frame, page, i))
return true;
}
}
return false;
}
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