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netsurf/render/html.c

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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 2003 James Bursa <bursa@users.sourceforge.net>
*/
#include <assert.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include "netsurf/utils/config.h"
#include "netsurf/content/content.h"
#include "netsurf/content/fetch.h"
#include "netsurf/content/fetchcache.h"
#ifdef riscos
#include "netsurf/desktop/gui.h"
#endif
#include "netsurf/render/html.h"
#include "netsurf/render/layout.h"
#include "netsurf/utils/utils.h"
#include "netsurf/utils/log.h"
static void html_convert_css_callback(content_msg msg, struct content *css,
void *p1, void *p2, const char *error);
static void html_head(struct content *c, xmlNode *head);
static void html_find_stylesheets(struct content *c, xmlNode *head);
static void html_object_callback(content_msg msg, struct content *object,
void *p1, void *p2, const char *error);
static bool html_object_type_permitted(const content_type type,
const content_type *permitted_types);
void html_create(struct content *c, const char *params[])
{
unsigned int i;
xmlCharEncoding encoding = XML_CHAR_ENCODING_8859_1;
for (i = 0; params[i]; i += 2) {
if (strcasecmp(params[i], "charset") == 0) {
encoding = xmlParseCharEncoding(params[i + 1]);
if (encoding == XML_CHAR_ENCODING_ERROR)
encoding = XML_CHAR_ENCODING_8859_1;
break;
}
}
c->data.html.parser = htmlCreatePushParserCtxt(0, 0, "", 0, 0, encoding);
c->data.html.layout = NULL;
c->data.html.style = NULL;
c->data.html.fonts = NULL;
c->data.html.length = 0;
c->data.html.source = xcalloc(0, 1);
c->data.html.base_url = xstrdup(c->url);
c->data.html.background_colour = TRANSPARENT;
c->data.html.string_pool = pool_create(8000);
assert(c->data.html.string_pool);
c->data.html.box_pool = pool_create(sizeof (struct box) * 100);
assert(c->data.html.box_pool);
}
#define CHUNK 4096
void html_process_data(struct content *c, char *data, unsigned long size)
{
unsigned long x;
LOG(("content %s, size %lu", c->url, size));
/*cache_dump();*/
c->data.html.source = xrealloc(c->data.html.source, c->data.html.length + size);
memcpy(c->data.html.source + c->data.html.length, data, size);
c->data.html.length += size;
c->size += size;
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);
}
int html_convert(struct content *c, unsigned int width, unsigned int height)
{
unsigned int i;
xmlDoc *document;
xmlNode *html, *head;
/* 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);
if (document == NULL) {
LOG(("Parsing failed"));
return 1;
}
/* 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);
return 1;
}
for (head = html->children;
head != 0 && head->type != XML_ELEMENT_NODE;
head = head->next)
;
if (strcmp((const char *) head->name, "head") != 0) {
head = 0;
LOG(("head element not found"));
}
if (head != 0)
html_head(c, head);
/* get stylesheets */
html_find_stylesheets(c, head);
/* convert xml tree to box tree */
LOG(("XML to box"));
sprintf(c->status_message, "Processing document");
content_broadcast(c, CONTENT_MSG_STATUS, 0);
xml_to_box(html, c);
/*box_dump(c->data.html.layout->children, 0);*/
/* XML tree and stylesheets not required past this point */
xmlFreeDoc(document);
content_remove_user(c->data.html.stylesheet_content[0],
html_convert_css_callback, c, 0);
if (c->data.html.stylesheet_content[1] != 0)
content_destroy(c->data.html.stylesheet_content[1]);
for (i = 2; i != c->data.html.stylesheet_count; i++)
if (c->data.html.stylesheet_content[i] != 0)
content_remove_user(c->data.html.stylesheet_content[i],
html_convert_css_callback, c, (void*)i);
xfree(c->data.html.stylesheet_content);
/* layout the box tree */
sprintf(c->status_message, "Formatting document");
content_broadcast(c, CONTENT_MSG_STATUS, 0);
LOG(("Layout document"));
layout_document(c->data.html.layout->children, width);
/*box_dump(c->data.html.layout->children, 0);*/
c->width = c->data.html.layout->children->width;
c->height = c->data.html.layout->children->height;
if (c->active == 0) {
c->status = CONTENT_STATUS_DONE;
sprintf(c->status_message, "Document done");
} else {
c->status = CONTENT_STATUS_READY;
sprintf(c->status_message, "Fetching %u objects", c->active);
}
return 0;
}
void html_convert_css_callback(content_msg msg, struct content *css,
void *p1, void *p2, const char *error)
{
struct content *c = p1;
unsigned int i = (unsigned int) 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--;
c->error = 1;
sprintf(c->status_message, "Warning: stylesheet is not CSS");
content_broadcast(c, CONTENT_MSG_STATUS, 0);
content_remove_user(css, html_convert_css_callback, c, (void*)i);
}
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--;
c->error = 1;
break;
case CONTENT_MSG_STATUS:
snprintf(c->status_message, 80, "Loading %u stylesheets: %s",
c->active, css->status_message);
content_broadcast(c, CONTENT_MSG_STATUS, 0);
break;
case CONTENT_MSG_REDIRECT:
c->active--;
c->data.html.stylesheet_content[i] = fetchcache(
error, c->url, html_convert_css_callback,
c, (void*)i, css->width, css->height, true
#ifdef WITH_POST
, 0, 0
#endif
#ifdef WITH_COOKIES
, false
#endif
);
if (c->data.html.stylesheet_content[i] != 0 &&
c->data.html.stylesheet_content[i]->status != CONTENT_STATUS_DONE)
c->active++;
break;
#ifdef WITH_AUTH
case CONTENT_MSG_AUTH:
c->data.html.stylesheet_content[i] = 0;
c->active--;
c->error = 1;
break;
#endif
default:
assert(0);
}
}
/**
* Process elements in <head>.
*/
void html_head(struct content *c, xmlNode *head)
{
xmlNode *node;
c->title = 0;
for (node = head->children; node != 0; node = node->next) {
if (!c->title && strcmp(node->name, "title") == 0) {
xmlChar *title = xmlNodeGetContent(node);
c->title = squash_tolat1(title);
xmlFree(title);
} else if (strcmp(node->name, "base") == 0) {
char *href = (char *) xmlGetProp(node, (const xmlChar *) "href");
if (href) {
char *url = url_join(href, 0);
if (url)
c->data.html.base_url = url;
xmlFree(href);
}
}
}
}
void html_find_stylesheets(struct content *c, xmlNode *head)
{
xmlNode *node, *node2;
char *rel, *type, *media, *href, *data, *url;
unsigned int i = 2;
unsigned int last_active = 0;
/* stylesheet 0 is the base style sheet, stylesheet 1 is any <style> elements */
c->data.html.stylesheet_content = xcalloc(2, sizeof(*c->data.html.stylesheet_content));
c->data.html.stylesheet_content[1] = 0;
c->data.html.stylesheet_count = 2;
c->error = 0;
c->active = 0;
c->data.html.stylesheet_content[0] = fetchcache(
#ifdef riscos
"file:///%3CNetSurf$Dir%3E/Resources/CSS",
#else
"file:///home/james/Projects/netsurf/CSS",
#endif
c->url,
html_convert_css_callback,
c, 0, c->width, c->height, true
#ifdef WITH_POST
, 0, 0
#endif
#ifdef WITH_COOKIES
, false
#endif
);
assert(c->data.html.stylesheet_content[0] != 0);
if (c->data.html.stylesheet_content[0]->status != CONTENT_STATUS_DONE)
c->active++;
for (node = head == 0 ? 0 : head->children; node != 0; node = node->next) {
if (strcmp(node->name, "link") == 0) {
/* rel='stylesheet' */
if (!(rel = (char *) xmlGetProp(node, (const xmlChar *) "rel")))
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"))) {
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"))) {
if (strstr(media, "screen") == 0 &&
strstr(media, "all") == 0) {
xmlFree(media);
continue;
}
xmlFree(media);
}
/* href='...' */
if (!(href = (char *) xmlGetProp(node, (const xmlChar *) "href")))
continue;
/* TODO: only the first preferred stylesheets (ie. those with a
* title attribute) should be loaded (see HTML4 14.3) */
url = url_join(href, c->data.html.base_url);
xmlFree(href);
if (!url)
continue;
LOG(("linked stylesheet %i '%s'", i, url));
/* start fetch */
c->data.html.stylesheet_content = xrealloc(c->data.html.stylesheet_content,
(i + 1) * sizeof(*c->data.html.stylesheet_content));
c->data.html.stylesheet_content[i] = fetchcache(url, c->url,
html_convert_css_callback, c, (void*)i,
c->width, c->height, true
#ifdef WITH_POST
, 0, 0
#endif
#ifdef WITH_COOKIES
, false
#endif
);
if (c->data.html.stylesheet_content[i] &&
c->data.html.stylesheet_content[i]->status != CONTENT_STATUS_DONE)
c->active++;
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"))) {
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"))) {
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[1] == 0) {
const char *params[] = { 0 };
c->data.html.stylesheet_content[1] =
content_create(c->data.html.base_url);
content_set_type(c->data.html.stylesheet_content[1], CONTENT_CSS, "text/css", params);
}
/* 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);
content_process_data(c->data.html.stylesheet_content[1],
data, strlen(data));
xmlFree(data);
}
}
}
c->data.html.stylesheet_count = i;
if (c->data.html.stylesheet_content[1] != 0) {
if (css_convert(c->data.html.stylesheet_content[1], c->width,
c->height)) {
/* conversion failed */
content_destroy(c->data.html.stylesheet_content[1]);
c->data.html.stylesheet_content[1] = 0;
}
}
/* complete the fetches */
while (c->active != 0) {
if (c->active != last_active) {
sprintf(c->status_message, "Loading %u stylesheets", c->active);
content_broadcast(c, CONTENT_MSG_STATUS, 0);
last_active = c->active;
}
fetch_poll();
gui_multitask();
}
if (c->error) {
sprintf(c->status_message, "Warning: some stylesheets failed to load");
content_broadcast(c, CONTENT_MSG_STATUS, 0);
}
}
void html_fetch_object(struct content *c, char *url, struct box *box,
const content_type *permitted_types)
{
unsigned int i = c->data.html.object_count;
/* add to object list */
c->data.html.object = xrealloc(c->data.html.object,
(i + 1) * sizeof(*c->data.html.object));
c->data.html.object[i].url = url;
c->data.html.object[i].box = box;
c->data.html.object[i].permitted_types = permitted_types;
/* start fetch */
c->data.html.object[i].content = fetchcache(url, c->url,
html_object_callback,
c, (void*)i, c->width, c->height,
true
#ifdef WITH_POST
, 0, 0
#endif
#ifdef WITH_COOKIES
, false
#endif
); /* we don't know the object's
dimensions yet; use
parent's as an estimate */
if (c->data.html.object[i].content) {
c->active++;
if (c->data.html.object[i].content->status == CONTENT_STATUS_DONE)
html_object_callback(CONTENT_MSG_DONE,
c->data.html.object[i].content, c, (void*)i, 0);
}
c->data.html.object_count++;
}
void html_object_callback(content_msg msg, struct content *object,
void *p1, void *p2, const char *error)
{
struct content *c = p1;
unsigned int i = (unsigned int) p2;
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))
break;
/* not acceptable */
c->data.html.object[i].content = 0;
c->active--;
c->error = 1;
sprintf(c->status_message, "Warning: bad object type");
content_broadcast(c, CONTENT_MSG_STATUS, 0);
content_remove_user(object, html_object_callback, c, (void*)i);
break;
case CONTENT_MSG_READY:
break;
case CONTENT_MSG_DONE:
LOG(("got object '%s'", object->url));
box->object = object;
/* set dimensions to object dimensions if auto */
if (box->style->width.width == CSS_WIDTH_AUTO) {
box->style->width.width = CSS_WIDTH_LENGTH;
box->style->width.value.length.unit = CSS_UNIT_PX;
box->style->width.value.length.value = object->width;
box->min_width = box->max_width = box->width = object->width;
}
/* invalidate parent min, max widths */
if (box->parent && (unsigned long)box->parent->max_width != UNKNOWN_MAX_WIDTH) {
struct box *b = box->parent;
b->max_width = UNKNOWN_MAX_WIDTH;
for (b = b->parent; b != 0 &&
(b->type == BOX_TABLE_ROW_GROUP ||
b->type == BOX_TABLE_ROW ||
(unsigned long)b->max_width != UNKNOWN_MAX_WIDTH);
b = b->parent) {
b->max_width = UNKNOWN_MAX_WIDTH;
}
}
if (box->style->height.height == CSS_HEIGHT_AUTO) {
box->style->height.height = CSS_HEIGHT_LENGTH;
box->style->height.length.unit = CSS_UNIT_PX;
box->style->height.length.value = object->height;
box->height = object->height;
}
/* delete any clones of this box */
while (box->next && box->next->clone) {
/* box_free_box(box->next); */
box->next = box->next->next;
}
c->active--;
break;
case CONTENT_MSG_ERROR:
c->data.html.object[i].content = 0;
c->active--;
c->error = 1;
snprintf(c->status_message, 80, "Image error: %s", error);
content_broadcast(c, CONTENT_MSG_STATUS, 0);
break;
case CONTENT_MSG_STATUS:
snprintf(c->status_message, 80, "Loading %i objects: %s",
c->active, object->status_message);
/* content_broadcast(c, CONTENT_MSG_STATUS, 0); */
break;
case CONTENT_MSG_REDIRECT:
c->active--;
free(c->data.html.object[i].url);
c->data.html.object[i].url = xstrdup(error);
c->data.html.object[i].content = fetchcache(
error, c->url, html_object_callback,
c, (void*)i, 0, 0, true
#ifdef WITH_POST
, 0, 0
#endif
#ifdef WITH_COOKIES
, false
#endif
);
if (c->data.html.object[i].content) {
c->active++;
if (c->data.html.object[i].content->status == CONTENT_STATUS_DONE)
html_object_callback(CONTENT_MSG_DONE,
c->data.html.object[i].content, c, (void*)i, 0);
}
break;
case CONTENT_MSG_REFORMAT:
break;
#ifdef WITH_AUTH
case CONTENT_MSG_AUTH:
c->data.html.object[i].content = 0;
c->active--;
c->error = 1;
break;
#endif
default:
assert(0);
}
LOG(("%i active", c->active));
if (c->status == CONTENT_STATUS_READY && c->active == 0) {
/* all objects have arrived */
content_reformat(c, c->available_width, 0);
c->status = CONTENT_STATUS_DONE;
sprintf(c->status_message, "Document done");
content_broadcast(c, CONTENT_MSG_DONE, 0);
}
if (c->status == CONTENT_STATUS_READY)
sprintf(c->status_message, "Loading %i objects", c->active);
}
/**
* 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;
}
void html_revive(struct content *c, unsigned int width, unsigned int height)
{
unsigned int i;
/* reload objects and fix pointers */
for (i = 0; i != c->data.html.object_count; i++) {
if (c->data.html.object[i].content != 0) {
c->data.html.object[i].content = fetchcache(
c->data.html.object[i].url, c->url,
html_object_callback,
c, (void*)i, 0, 0, true
#ifdef WITH_POST
, 0, 0
#endif
#ifdef WITH_COOKIES
, false
#endif
);
if (c->data.html.object[i].content &&
c->data.html.object[i].content->status != CONTENT_STATUS_DONE)
c->active++;
}
}
layout_document(c->data.html.layout->children, width);
c->width = c->data.html.layout->children->width;
c->height = c->data.html.layout->children->height;
if (c->active != 0)
c->status = CONTENT_STATUS_READY;
}
void html_reformat(struct content *c, unsigned int width, unsigned int height)
{
layout_document(c->data.html.layout->children, width);
c->width = c->data.html.layout->children->width;
c->height = c->data.html.layout->children->height;
}
void html_destroy(struct content *c)
{
unsigned int i;
LOG(("content %p", c));
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 != 0)
content_remove_user(c->data.html.object[i].content,
html_object_callback, c, (void*)i);
free(c->data.html.object[i].url);
}
free(c->data.html.object);
LOG(("layout %p", c->data.html.layout));
if (c->data.html.layout != 0)
box_free(c->data.html.layout);
LOG(("fonts %p", c->data.html.fonts));
if (c->data.html.fonts != 0)
font_free_set(c->data.html.fonts);
LOG(("title %p", c->title));
if (c->title != 0)
xfree(c->title);
if (c->data.html.source != 0)
xfree(c->data.html.source);
free(c->data.html.base_url);
pool_destroy(c->data.html.string_pool);
pool_destroy(c->data.html.box_pool);
}
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