mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-29 01:33:16 +03:00
b5cd93fb6b
Implement @import rewriting, fix and simplify code. svn path=/import/netsurf/; revision=676
505 lines
12 KiB
C
505 lines
12 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2004 John M Bell <jmb202@ecs.soton.ac.uk>
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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*/
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/** \file
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* Save HTML document with dependencies (implementation).
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*/
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#include <assert.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/types.h>
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#include <regex.h>
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#include "libxml/HTMLtree.h"
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#include "oslib/osfile.h"
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#include "netsurf/utils/config.h"
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#include "netsurf/content/content.h"
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#include "netsurf/css/css.h"
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#include "netsurf/render/box.h"
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#include "netsurf/riscos/gui.h"
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#include "netsurf/riscos/save_complete.h"
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#include "netsurf/utils/log.h"
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#include "netsurf/utils/url.h"
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#include "netsurf/utils/utils.h"
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#ifdef WITH_SAVE_COMPLETE
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/** \todo URL rewriting for @import rules
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* Objects used by embedded html pages
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* GUI
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*/
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regex_t save_complete_import_re;
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/** An entry in save_complete_list. */
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struct save_complete_entry {
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char *url; /**< Fully qualified URL, as per url_join output */
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int ptr; /**< Pointer to object's location in memory */
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struct save_complete_entry *next; /**< Next entry in list */
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};
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/** List of urls seen and saved so far. */
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static struct save_complete_entry *save_complete_list;
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static void save_imported_sheets(struct content *c, const char *path);
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static char * rewrite_stylesheet_urls(const char *source, unsigned int size,
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int *osize, const char *base);
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static int rewrite_document_urls(xmlDoc *doc, const char *base);
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static int rewrite_urls(xmlNode *n, const char *base);
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static void rewrite_url(xmlNode *n, const char *attr, const char *base);
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static void save_complete_add_url(const char *url, int id);
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static int save_complete_find_url(const char *url);
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/**
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* Save an HTML page with all dependencies.
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*
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* \param c CONTENT_HTML to save
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* \param path directory to save to (must exist)
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*/
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void save_complete(struct content *c, const char *path)
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{
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char spath[256];
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unsigned int i;
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htmlParserCtxtPtr toSave;
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if (c->type != CONTENT_HTML)
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return;
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save_complete_list = 0;
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/* save stylesheets, ignoring the base sheet and <style> elements */
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for (i = 2; i != c->data.html.stylesheet_count; i++) {
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struct content *css = c->data.html.stylesheet_content[i];
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char *source;
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int source_len;
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if (!css)
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continue;
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save_complete_add_url(css->url, (int) css);
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save_imported_sheets(css, path);
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snprintf(spath, sizeof spath, "%s.%x", path,
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(unsigned int) css);
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source = rewrite_stylesheet_urls(css->source_data,
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css->source_size, &source_len, css->url);
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if (source) {
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xosfile_save_stamped(spath, 0xf79, source,
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source + source_len);
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free(source);
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}
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}
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/* save objects */
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for (i = 0; i != c->data.html.object_count; i++) {
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struct content *obj = c->data.html.object[i].content;
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/* skip difficult content types */
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if (!obj || obj->type >= CONTENT_OTHER || !obj->source_data)
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continue;
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save_complete_add_url(obj->url, (int) obj);
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snprintf(spath, sizeof spath, "%s.%x", path,
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(unsigned int) obj);
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xosfile_save_stamped(spath,
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ro_content_filetype(obj),
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obj->source_data,
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obj->source_data + obj->source_size);
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}
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/* make a copy of the document tree */
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toSave = htmlCreateMemoryParserCtxt(c->source_data, c->source_size);
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htmlParseDocument(toSave);
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/* rewrite all urls we know about */
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if (rewrite_document_urls(toSave->myDoc, c->data.html.base_url) == 0) {
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xfree(spath);
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xmlFreeDoc(toSave->myDoc);
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htmlFreeParserCtxt(toSave);
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return;
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}
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/* save the html file out last of all */
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snprintf(spath, sizeof spath, "%s.index", path);
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htmlSaveFile(spath, toSave->myDoc);
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xosfile_set_type(spath, 0xfaf);
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xmlFreeDoc(toSave->myDoc);
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htmlFreeParserCtxt(toSave);
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/* free save_complete_list */
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while (save_complete_list) {
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struct save_complete_entry *next = save_complete_list->next;
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free(save_complete_list->url);
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free(save_complete_list);
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save_complete_list = next;
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}
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}
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void save_imported_sheets(struct content *c, const char *path)
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{
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char spath[256];
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unsigned int j;
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char *source;
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int source_len;
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for (j = 0; j != c->data.css.import_count; j++) {
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struct content *css = c->data.css.import_content[j];
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if (!css)
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continue;
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save_complete_add_url(css->url, (int) css);
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save_imported_sheets(css, path);
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snprintf(spath, sizeof spath, "%s.%x", path,
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(unsigned int) css);
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source = rewrite_stylesheet_urls(css->source_data,
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css->source_size, &source_len, css->url);
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if (source) {
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xosfile_save_stamped(spath, 0xf79, source,
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source + source_len);
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free(source);
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}
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}
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}
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/**
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* Initialise the save_complete module.
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*/
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void save_complete_init(void)
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{
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/* Match an @import rule - see CSS 2.1 G.1. */
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regcomp_wrapper(&save_complete_import_re,
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"@import" /* IMPORT_SYM */
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"[ \t\r\n\f]*" /* S* */
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/* 1 */
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"(" /* [ */
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/* 2 3 */
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"\"(([^\"]|[\\]\")*)\"" /* STRING (approximated) */
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"|"
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/* 4 5 */
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"'(([^']|[\\]')*)'"
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"|" /* | */
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"url\\([ \t\r\n\f]*" /* URI (approximated) */
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/* 6 7 */
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"\"(([^\"]|[\\]\")*)\""
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"[ \t\r\n\f]*\\)"
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"|"
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"url\\([ \t\r\n\f]*"
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/* 8 9 */
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"'(([^']|[\\]')*)'"
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"[ \t\r\n\f]*\\)"
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"|"
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"url\\([ \t\r\n\f]*"
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/* 10 */
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"([^) \t\r\n\f]*)"
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"[ \t\r\n\f]*\\)"
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")", /* ] */
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REG_EXTENDED | REG_ICASE);
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}
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/**
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* Rewrite stylesheet @import rules for save complete.
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*
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* @param source stylesheet source
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* @param size size of source
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* @param osize updated with the size of the result
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* @param head pointer to the head of the list containing imported urls
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* @param base url of stylesheet
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* @return converted source, or 0 on error
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*/
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char * rewrite_stylesheet_urls(const char *source, unsigned int size,
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int *osize, const char *base)
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{
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char *res;
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const char *url;
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char *url2;
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char buf[20];
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unsigned int offset = 0;
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int url_len = 0;
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int id;
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int m;
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unsigned int i;
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unsigned int imports = 0;
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regmatch_t match[11];
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/* count number occurences of @import to (over)estimate result size */
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/* can't use strstr because source is not 0-terminated string */
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for (i = 0; 7 < size && i != size - 7; i++) {
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if (source[i] == '@' &&
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tolower(source[i + 1]) == 'i' &&
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tolower(source[i + 2]) == 'm' &&
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tolower(source[i + 3]) == 'p' &&
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tolower(source[i + 4]) == 'o' &&
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tolower(source[i + 5]) == 'r' &&
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tolower(source[i + 6]) == 't')
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imports++;
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}
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res = malloc(size + imports * 20);
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if (!res) {
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warn_user("NoMemory");
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return 0;
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}
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*osize = 0;
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while (offset < size) {
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m = regexec(&save_complete_import_re, source + offset,
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11, match, 0);
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if (m)
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break;
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/*for (unsigned int i = 0; i != 11; i++) {
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if (match[i].rm_so == -1)
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continue;
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fprintf(stderr, "%i: '%.*s'\n", i,
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match[i].rm_eo - match[i].rm_so,
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source + offset + match[i].rm_so);
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}*/
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url = 0;
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if (match[2].rm_so != -1) {
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url = source + offset + match[2].rm_so;
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url_len = match[2].rm_eo - match[2].rm_so;
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} else if (match[4].rm_so != -1) {
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url = source + offset + match[4].rm_so;
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url_len = match[4].rm_eo - match[4].rm_so;
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} else if (match[6].rm_so != -1) {
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url = source + offset + match[6].rm_so;
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url_len = match[6].rm_eo - match[6].rm_so;
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} else if (match[8].rm_so != -1) {
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url = source + offset + match[8].rm_so;
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url_len = match[8].rm_eo - match[8].rm_so;
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} else if (match[10].rm_so != -1) {
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url = source + offset + match[10].rm_so;
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url_len = match[10].rm_eo - match[10].rm_so;
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}
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assert(url);
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url2 = strndup(url, url_len);
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if (!url2) {
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warn_user("NoMemory");
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free(res);
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return 0;
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}
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url = url_join(url2, base);
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free(url2);
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if (!url) {
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warn_user("NoMemory");
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free(res);
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return 0;
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}
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/* copy data before match */
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memcpy(res + *osize, source + offset, match[0].rm_so);
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*osize += match[0].rm_so;
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id = save_complete_find_url(url);
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if (id) {
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/* replace import */
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sprintf(buf, "@import '%x'", id);
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memcpy(res + *osize, buf, strlen(buf));
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*osize += strlen(buf);
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} else {
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/* copy import */
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memcpy(res + *osize, source + offset + match[0].rm_so,
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match[0].rm_eo - match[0].rm_so);
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*osize += match[0].rm_eo - match[0].rm_so;
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}
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assert(0 < match[0].rm_eo);
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offset += match[0].rm_eo;
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}
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/* copy rest of source */
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if (offset < size) {
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memcpy(res + *osize, source + offset, size - offset);
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*osize += size - offset;
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}
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return res;
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}
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/**
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* Rewrite URLs in a HTML document to be relative
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*
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* @param doc The root of the document tree
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* @return 0 on error. >0 otherwise
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* \param base base url of document
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*/
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int rewrite_document_urls(xmlDoc *doc, const char *base)
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{
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xmlNode *html;
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/* find the html element */
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for (html = doc->children;
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html!=0 && html->type != XML_ELEMENT_NODE;
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html = html->next)
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;
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if (html == 0 || strcmp((const char*)html->name, "html") != 0) {
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return 0;
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}
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rewrite_urls(html, base);
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return 1;
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}
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/**
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* Traverse tree, rewriting URLs as we go.
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*
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* @param n The root of the tree
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* @return 0 on error. >0 otherwise
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* \param base base url of document
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*/
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int rewrite_urls(xmlNode *n, const char *base)
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{
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xmlNode *this;
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/**
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* We only need to consider the following cases:
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*
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* Attribute: Elements:
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*
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* 1) data <object>
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* 2) href <a> <area> <link> <base>
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* 3) src <script> <input> <frame> <iframe> <img>
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*/
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if (n->type == XML_ELEMENT_NODE) {
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/* 1 */
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if (strcmp(n->name, "object") == 0) {
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rewrite_url(n, "data", base);
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}
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/* 2 */
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else if (strcmp(n->name, "a") == 0 ||
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strcmp(n->name, "area") == 0 ||
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strcmp(n->name, "link") == 0 ||
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strcmp(n->name, "base") == 0) {
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rewrite_url(n, "href", base);
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}
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/* 3 */
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else if (strcmp(n->name, "frame") == 0 ||
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strcmp(n->name, "iframe") == 0 ||
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strcmp(n->name, "input") == 0 ||
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strcmp(n->name, "img") == 0 ||
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strcmp(n->name, "script") == 0) {
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rewrite_url(n, "src", base);
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}
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}
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else {
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return 0;
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}
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/* now recurse */
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for (this = n->children; this != 0; this = this->next) {
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rewrite_urls(this, base);
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}
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return 1;
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}
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/**
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* Rewrite an URL in a HTML document.
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*
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* \param n The node to modify
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* \param attr The html attribute to modify
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* \param base base url of document
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*/
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void rewrite_url(xmlNode *n, const char *attr, const char *base)
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{
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char *url, *data;
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char rel[256];
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int id;
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data = xmlGetProp(n, (const xmlChar*)attr);
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if (!data) return;
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url = url_join(data, base);
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if (!url) {
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xmlFree(data);
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return;
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}
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id = save_complete_find_url(url);
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if (id) {
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/* found a match */
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snprintf(rel, sizeof rel, "%x", id);
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xmlSetProp(n, (const xmlChar *) attr, (xmlChar *) rel);
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} else {
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/* no match found */
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xmlSetProp(n, (const xmlChar *) attr, (xmlChar *) url);
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}
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free(url);
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xmlFree(data);
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}
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/**
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* Add a url to the save_complete_list.
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*
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* \param url url to add (copied)
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* \param id id to use for url
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*/
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void save_complete_add_url(const char *url, int id)
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{
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struct save_complete_entry *entry;
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entry = malloc(sizeof (*entry));
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if (!entry)
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return;
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entry->url = strdup(url);
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if (!url) {
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free(entry);
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return;
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}
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entry->ptr = id;
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entry->next = save_complete_list;
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save_complete_list = entry;
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}
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/**
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* Look up a url in the save_complete_list.
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*
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* \param url url to find
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* \param len length of url
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* \return id to use for url, or 0 if not present
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*/
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int save_complete_find_url(const char *url)
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{
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struct save_complete_entry *entry;
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for (entry = save_complete_list; entry; entry = entry->next)
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if (strcmp(url, entry->url) == 0)
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break;
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if (entry)
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return entry->ptr;
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return 0;
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}
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#endif
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