in order. If you need to check whether a file has been downloaded,
use a hash table, e.g. dl_file_url_map. */
static slist *downloaded_html_files;
+
+static void register_delete_file PARAMS ((const char *));
\f
/* Functions for maintaining the URL queue. */
return 1;
}
\f
-static int descend_url_p PARAMS ((const struct urlpos *, struct url *, int,
- struct url *, struct hash_table *));
+static int download_child_p PARAMS ((const struct urlpos *, struct url *, int,
+ struct url *, struct hash_table *));
static int descend_redirect_p PARAMS ((const char *, const char *, int,
struct url *, struct hash_table *));
if (downloaded_exceeds_quota ())
break;
-
if (status == FWRITEERR)
break;
- /* Get the next URL from the queue. */
+ /* Get the next URL from the queue... */
if (!url_dequeue (queue,
(const char **)&url, (const char **)&referer,
&depth))
break;
- /* And download it. */
+ /* ...and download it. Note that this download is in most cases
+ unconditional, as download_child_p already makes sure a file
+ doesn't get enqueued twice -- and yet this check is here, and
+ not in download_child_p. This is so that if you run `wget -r
+ URL1 URL2', and a random URL is encountered once under URL1
+ and again under URL2, but at a different (possibly smaller)
+ depth, we want the URL's children to be taken into account
+ the second time. */
+ if (dl_url_file_map && hash_table_contains (dl_url_file_map, url))
+ {
+ DEBUGP (("Already downloaded \"%s\", reusing it from \"%s\".\n",
+ url, (char *)hash_table_get (dl_url_file_map, url)));
+ }
+ else
+ {
+ int dt = 0;
+ char *redirected = NULL;
+ int oldrec = opt.recursive;
- {
- int dt = 0;
- char *redirected = NULL;
- int oldrec = opt.recursive;
+ opt.recursive = 0;
+ status = retrieve_url (url, &file, &redirected, NULL, &dt);
+ opt.recursive = oldrec;
- opt.recursive = 0;
- status = retrieve_url (url, &file, &redirected, NULL, &dt);
- opt.recursive = oldrec;
+ if (file && status == RETROK
+ && (dt & RETROKF) && (dt & TEXTHTML))
+ descend = 1;
- if (file && status == RETROK
- && (dt & RETROKF) && (dt & TEXTHTML))
- descend = 1;
+ if (redirected)
+ {
+ /* We have been redirected, possibly to another host, or
+ different path, or wherever. Check whether we really
+ want to follow it. */
+ if (descend)
+ {
+ if (!descend_redirect_p (redirected, url, depth,
+ start_url_parsed, blacklist))
+ descend = 0;
+ else
+ /* Make sure that the old pre-redirect form gets
+ blacklisted. */
+ string_set_add (blacklist, url);
+ }
- if (redirected)
- {
- /* We have been redirected, possibly to another host, or
- different path, or wherever. Check whether we really
- want to follow it. */
- if (descend)
- {
- if (!descend_redirect_p (redirected, url, depth,
- start_url_parsed, blacklist))
- descend = 0;
- else
- /* Make sure that the old pre-redirect form gets
- blacklisted. */
- string_set_add (blacklist, url);
- }
-
- xfree (url);
- url = redirected;
- }
- }
+ xfree (url);
+ url = redirected;
+ }
+ }
if (descend
&& depth >= opt.reclevel && opt.reclevel != INFINITE_RECURSION)
continue;
if (dash_p_leaf_HTML && !child->link_inline_p)
continue;
- if (descend_url_p (child, url_parsed, depth, start_url_parsed,
- blacklist))
+ if (download_child_p (child, url_parsed, depth, start_url_parsed,
+ blacklist))
{
url_enqueue (queue, xstrdup (child->url->url),
xstrdup (url), depth + 1);
file);
if (unlink (file))
logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno));
+ register_delete_file (file);
}
xfree (url);
will help if those URLs are encountered many times. */
static int
-descend_url_p (const struct urlpos *upos, struct url *parent, int depth,
- struct url *start_url_parsed, struct hash_table *blacklist)
+download_child_p (const struct urlpos *upos, struct url *parent, int depth,
+ struct url *start_url_parsed, struct hash_table *blacklist)
{
struct url *u = upos->url;
const char *url = u->url;
return 0;
}
-/* This function determines whether we should descend the children of
- the URL whose download resulted in a redirection, possibly to
- another host, etc. It is needed very rarely, and thus it is merely
- a simple-minded wrapper around descend_url_p. */
+/* This function determines whether we will consider downloading the
+ children of a URL whose download resulted in a redirection,
+ possibly to another host, etc. It is needed very rarely, and thus
+ it is merely a simple-minded wrapper around download_child_p. */
static int
descend_redirect_p (const char *redirected, const char *original, int depth,
memset (upos, 0, sizeof (*upos));
upos->url = new_parsed;
- success = descend_url_p (upos, orig_parsed, depth,
- start_url_parsed, blacklist);
+ success = download_child_p (upos, orig_parsed, depth,
+ start_url_parsed, blacklist);
url_free (orig_parsed);
url_free (new_parsed);
}
\f
-/* Register that URL has been successfully downloaded to FILE. */
+#define ENSURE_TABLES_EXIST do { \
+ if (!dl_file_url_map) \
+ dl_file_url_map = make_string_hash_table (0); \
+ if (!dl_url_file_map) \
+ dl_url_file_map = make_string_hash_table (0); \
+} while (0)
+
+static int
+dissociate_urls_from_file_mapper (void *key, void *value, void *arg)
+{
+ char *mapping_url = (char *)key;
+ char *mapping_file = (char *)value;
+ char *file = (char *)arg;
+
+ if (0 == strcmp (mapping_file, file))
+ {
+ hash_table_remove (dl_url_file_map, mapping_url);
+ xfree (mapping_url);
+ xfree (mapping_file);
+ }
+
+ /* Continue mapping. */
+ return 0;
+}
+
+/* Remove all associations from various URLs to FILE from dl_url_file_map. */
+
+static void
+dissociate_urls_from_file (const char *file)
+{
+ hash_table_map (dl_url_file_map, dissociate_urls_from_file_mapper,
+ (char *)file);
+}
+
+/* Register that URL has been successfully downloaded to FILE. This
+ is used by the link conversion code to convert references to URLs
+ to references to local files. It is also being used to check if a
+ URL has already been downloaded. */
void
register_download (const char *url, const char *file)
{
- if (!opt.convert_links)
- return;
- if (!dl_file_url_map)
- dl_file_url_map = make_string_hash_table (0);
- if (!dl_url_file_map)
- dl_url_file_map = make_string_hash_table (0);
-
- if (!hash_table_contains (dl_file_url_map, file))
- hash_table_put (dl_file_url_map, xstrdup (file), xstrdup (url));
- if (!hash_table_contains (dl_url_file_map, url))
- hash_table_put (dl_url_file_map, xstrdup (url), xstrdup (file));
+ char *old_file, *old_url;
+
+ ENSURE_TABLES_EXIST;
+
+ /* With some forms of retrieval, it is possible, although not
+ likely, for different URLs to resolve to the same file name. For
+ example, "http://www.server.com/" and
+ "http://www.server.com/index.html" will both resolve to the same
+ file, "index.html". If both are downloaded, the second download
+ will override the first one.
+
+ If that happens, dissociate the old file name from the URL. */
+
+ if (hash_table_get_pair (dl_file_url_map, file, &old_file, &old_url))
+ {
+ if (0 == strcmp (url, old_url))
+ /* We have somehow managed to download the same URL twice.
+ Nothing to do. */
+ return;
+
+ hash_table_remove (dl_file_url_map, file);
+ xfree (old_file);
+ xfree (old_url);
+
+ /* Remove all the URLs that point to this file. Yes, there can
+ be more than one such URL, because we store redirections as
+ multiple entries in dl_url_file_map. For example, if URL1
+ redirects to URL2 which gets downloaded to FILE, we map both
+ URL1 and URL2 to FILE in dl_url_file_map. (dl_file_url_map
+ only points to URL2.) When another URL gets loaded to FILE,
+ we want both URL1 and URL2 dissociated from it.
+
+ This is a relatively expensive operation because it performs
+ a linear search of the whole hash table, but it should be
+ called very rarely, only when two URLs resolve to the same
+ file name, *and* the "<file>.1" extensions are turned off.
+ In other words, almost never. */
+ dissociate_urls_from_file (file);
+ }
+
+ /* A URL->FILE mapping is not possible without a FILE->URL mapping.
+ If the latter were present, it should have been removed by the
+ above `if'. */
+ assert (!hash_table_contains (dl_url_file_map, url));
+
+ hash_table_put (dl_file_url_map, xstrdup (file), xstrdup (url));
+ hash_table_put (dl_url_file_map, xstrdup (url), xstrdup (file));
}
/* Register that FROM has been redirected to TO. This assumes that TO
{
char *file;
- if (!opt.convert_links)
- return;
+ ENSURE_TABLES_EXIST;
file = hash_table_get (dl_url_file_map, to);
assert (file != NULL);
hash_table_put (dl_url_file_map, xstrdup (from), xstrdup (file));
}
-/* Register that URL corresponds to the HTML file FILE. */
+/* Register that the file has been deleted. */
+
+static void
+register_delete_file (const char *file)
+{
+ char *old_url, *old_file;
+
+ ENSURE_TABLES_EXIST;
+
+ if (!hash_table_get_pair (dl_file_url_map, file, &old_file, &old_url))
+ return;
+
+ hash_table_remove (dl_file_url_map, file);
+ xfree (old_file);
+ xfree (old_url);
+ dissociate_urls_from_file (file);
+}
+
+/* Register that FILE is an HTML file that has been downloaded. */
void
register_html (const char *url, const char *file)
struct urlpos *urls, *cur_url;
char *url;
- DEBUGP (("Rescanning %s\n", html->string));
-
/* Determine the URL of the HTML file. get_urls_html will need
it. */
url = hash_table_get (dl_file_url_map, html->string);
- if (url)
- DEBUGP (("It should correspond to %s.\n", url));
- else
- DEBUGP (("I cannot find the corresponding URL.\n"));
+ if (!url)
+ {
+ DEBUGP (("Apparently %s has been removed.\n", html->string));
+ continue;
+ }
+
+ DEBUGP (("Rescanning %s (from %s)\n", html->string, url));
/* Parse the HTML file... */
urls = get_urls_html (html->string, url, NULL);
projects / wget / commitdiff