Adding upstream version 1.21.3.upstream/1.21.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 978 insertions, 0 deletions

diff --git a/src/html-url.c b/src/html-url.c
new file mode 100644
index 0000000..53d3a93
--- /dev/null
+++ b/src/html-url.c
@@ -0,0 +1,978 @@
+/* Collect URLs from HTML source.
+   Copyright (C) 1998-2012, 2015, 2018-2022 Free Software Foundation,
+   Inc.
+
+This file is part of GNU Wget.
+
+GNU Wget is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+GNU Wget is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Wget.  If not, see <http://www.gnu.org/licenses/>.
+
+Additional permission under GNU GPL version 3 section 7
+
+If you modify this program, or any covered work, by linking or
+combining it with the OpenSSL project's OpenSSL library (or a
+modified version of that library), containing parts covered by the
+terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
+grants you additional permission to convey the resulting work.
+Corresponding Source for a non-source form of such a combination
+shall include the source code for the parts of OpenSSL used as well
+as that of the covered work.  */
+
+#include "wget.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "exits.h"
+#include "html-parse.h"
+#include "url.h"
+#include "utils.h"
+#include "hash.h"
+#include "convert.h"
+#include "recur.h"
+#include "html-url.h"
+#include "css-url.h"
+#include "c-strcase.h"
+
+typedef void (*tag_handler_t) (int, struct taginfo *, struct map_context *);
+
+#define DECLARE_TAG_HANDLER(fun)                                \
+  static void fun (int, struct taginfo *, struct map_context *)
+
+DECLARE_TAG_HANDLER (tag_find_urls);
+DECLARE_TAG_HANDLER (tag_handle_base);
+DECLARE_TAG_HANDLER (tag_handle_form);
+DECLARE_TAG_HANDLER (tag_handle_img);
+DECLARE_TAG_HANDLER (tag_handle_link);
+DECLARE_TAG_HANDLER (tag_handle_meta);
+
+enum {
+  TAG_A,
+  TAG_APPLET,
+  TAG_AREA,
+  TAG_BASE,
+  TAG_BGSOUND,
+  TAG_BODY,
+  TAG_EMBED,
+  TAG_FIG,
+  TAG_FORM,
+  TAG_FRAME,
+  TAG_IFRAME,
+  TAG_IMG,
+  TAG_INPUT,
+  TAG_LAYER,
+  TAG_LINK,
+  TAG_META,
+  TAG_OBJECT,
+  TAG_OVERLAY,
+  TAG_SCRIPT,
+  TAG_TABLE,
+  TAG_TD,
+  TAG_TH,
+  TAG_VIDEO,
+  TAG_AUDIO,
+  TAG_SOURCE
+};
+
+/* The list of known tags and functions used for handling them.  Most
+   tags are simply harvested for URLs. */
+static struct known_tag {
+  int tagid;
+  const char *name;
+  tag_handler_t handler;
+} known_tags[] = {
+  { TAG_A,       "a",           tag_find_urls },
+  { TAG_APPLET,  "applet",      tag_find_urls },
+  { TAG_AREA,    "area",        tag_find_urls },
+  { TAG_BASE,    "base",        tag_handle_base },
+  { TAG_BGSOUND, "bgsound",     tag_find_urls },
+  { TAG_BODY,    "body",        tag_find_urls },
+  { TAG_EMBED,   "embed",       tag_find_urls },
+  { TAG_FIG,     "fig",         tag_find_urls },
+  { TAG_FORM,    "form",        tag_handle_form },
+  { TAG_FRAME,   "frame",       tag_find_urls },
+  { TAG_IFRAME,  "iframe",      tag_find_urls },
+  { TAG_IMG,     "img",         tag_handle_img },
+  { TAG_INPUT,   "input",       tag_find_urls },
+  { TAG_LAYER,   "layer",       tag_find_urls },
+  { TAG_LINK,    "link",        tag_handle_link },
+  { TAG_META,    "meta",        tag_handle_meta },
+  { TAG_OBJECT,  "object",      tag_find_urls },
+  { TAG_OVERLAY, "overlay",     tag_find_urls },
+  { TAG_SCRIPT,  "script",      tag_find_urls },
+  { TAG_TABLE,   "table",       tag_find_urls },
+  { TAG_TD,      "td",          tag_find_urls },
+  { TAG_TH,      "th",          tag_find_urls },
+  { TAG_VIDEO,   "video",       tag_find_urls },
+  { TAG_AUDIO,   "audio",       tag_find_urls },
+  { TAG_SOURCE,  "source",      tag_find_urls }
+};
+
+/* tag_url_attributes documents which attributes of which tags contain
+   URLs to harvest.  It is used by tag_find_urls.  */
+
+/* Defines for the FLAGS. */
+
+/* The link is "inline", i.e. needs to be retrieved for this document
+   to be correctly rendered.  Inline links include inlined images,
+   stylesheets, children frames, etc.  */
+#define ATTR_INLINE     1
+
+/* The link is expected to yield HTML contents.  It's important not to
+   try to follow HTML obtained by following e.g. <img src="...">
+   regardless of content-type.  Doing this causes infinite loops for
+   "images" that return non-404 error pages with links to the same
+   image.  */
+#define ATTR_HTML       2
+
+/* For tags handled by tag_find_urls: attributes that contain URLs to
+   download. */
+static struct {
+  int tagid;
+  const char *attr_name;
+  int flags;
+} tag_url_attributes[] = {
+  { TAG_A,              "href",         ATTR_HTML },
+  { TAG_APPLET,         "code",         ATTR_INLINE },
+  { TAG_AREA,           "href",         ATTR_HTML },
+  { TAG_BGSOUND,        "src",          ATTR_INLINE },
+  { TAG_BODY,           "background",   ATTR_INLINE },
+  { TAG_EMBED,          "href",         ATTR_HTML },
+  { TAG_EMBED,          "src",          ATTR_INLINE | ATTR_HTML },
+  { TAG_FIG,            "src",          ATTR_INLINE },
+  { TAG_FRAME,          "src",          ATTR_INLINE | ATTR_HTML },
+  { TAG_IFRAME,         "src",          ATTR_INLINE | ATTR_HTML },
+  { TAG_IMG,            "href",         ATTR_INLINE },
+  { TAG_IMG,            "lowsrc",       ATTR_INLINE },
+  { TAG_IMG,            "src",          ATTR_INLINE },
+  { TAG_INPUT,          "src",          ATTR_INLINE },
+  { TAG_LAYER,          "src",          ATTR_INLINE | ATTR_HTML },
+  { TAG_OBJECT,         "data",         ATTR_INLINE },
+  { TAG_OVERLAY,        "src",          ATTR_INLINE | ATTR_HTML },
+  { TAG_SCRIPT,         "src",          ATTR_INLINE },
+  { TAG_TABLE,          "background",   ATTR_INLINE },
+  { TAG_TD,             "background",   ATTR_INLINE },
+  { TAG_TH,             "background",   ATTR_INLINE },
+  { TAG_VIDEO,          "src",          ATTR_INLINE },
+  { TAG_VIDEO,          "poster",       ATTR_INLINE },
+  { TAG_AUDIO,          "src",          ATTR_INLINE },
+  { TAG_AUDIO,          "poster",       ATTR_INLINE },
+  { TAG_SOURCE,         "src",          ATTR_INLINE }
+};
+
+/* The lists of interesting tags and attributes are built dynamically,
+   from the information above.  However, some places in the code refer
+   to the attributes not mentioned here.  We add them manually.  */
+static const char *additional_attributes[] = {
+  "rel",                        /* used by tag_handle_link  */
+  "type",                       /* used by tag_handle_link  */
+  "http-equiv",                 /* used by tag_handle_meta  */
+  "name",                       /* used by tag_handle_meta  */
+  "content",                    /* used by tag_handle_meta  */
+  "action",                     /* used by tag_handle_form  */
+  "style",                      /* used by check_style_attr */
+  "srcset",                     /* used by tag_handle_img */
+};
+
+static struct hash_table *interesting_tags;
+static struct hash_table *interesting_attributes;
+
+/* Will contains the (last) charset found in 'http-equiv=content-type'
+   meta tags  */
+static char *meta_charset;
+
+static void
+init_interesting (void)
+{
+  /* Init the variables interesting_tags and interesting_attributes
+     that are used by the HTML parser to know which tags and
+     attributes we're interested in.  We initialize this only once,
+     for performance reasons.
+
+     Here we also make sure that what we put in interesting_tags
+     matches the user's preferences as specified through --ignore-tags
+     and --follow-tags.  */
+
+  size_t i;
+  interesting_tags = make_nocase_string_hash_table (countof (known_tags));
+
+  /* First, add all the tags we know hot to handle, mapped to their
+     respective entries in known_tags.  */
+  for (i = 0; i < countof (known_tags); i++)
+    hash_table_put (interesting_tags, known_tags[i].name, known_tags + i);
+
+  /* Then remove the tags ignored through --ignore-tags.  */
+  if (opt.ignore_tags)
+    {
+      char **ignored;
+      for (ignored = opt.ignore_tags; *ignored; ignored++)
+        hash_table_remove (interesting_tags, *ignored);
+    }
+
+  /* If --follow-tags is specified, use only those tags.  */
+  if (opt.follow_tags)
+    {
+      /* Create a new table intersecting --follow-tags and known_tags,
+         and use it as interesting_tags.  */
+      struct hash_table *intersect = make_nocase_string_hash_table (0);
+      char **followed;
+      for (followed = opt.follow_tags; *followed; followed++)
+        {
+          struct known_tag *t = hash_table_get (interesting_tags, *followed);
+          if (!t)
+            continue;           /* ignore unknown --follow-tags entries. */
+          hash_table_put (intersect, *followed, t);
+        }
+      hash_table_destroy (interesting_tags);
+      interesting_tags = intersect;
+    }
+
+  /* Add the attributes we care about. */
+  interesting_attributes = make_nocase_string_hash_table (10);
+  for (i = 0; i < countof (additional_attributes); i++)
+    hash_table_put (interesting_attributes, additional_attributes[i], "1");
+  for (i = 0; i < countof (tag_url_attributes); i++)
+    hash_table_put (interesting_attributes,
+                    tag_url_attributes[i].attr_name, "1");
+}
+
+/* Find the value of attribute named NAME in the taginfo TAG.  If the
+   attribute is not present, return NULL.  If ATTRIND is non-NULL, the
+   index of the attribute in TAG will be stored there.  */
+
+static char *
+find_attr (struct taginfo *tag, const char *name, int *attrind)
+{
+  int i;
+  for (i = 0; i < tag->nattrs; i++)
+    if (!c_strcasecmp (tag->attrs[i].name, name))
+      {
+        if (attrind)
+          *attrind = i;
+        return tag->attrs[i].value;
+      }
+  return NULL;
+}
+
+/* used for calls to append_url */
+#define ATTR_POS(tag, attrind, ctx) \
+ (tag->attrs[attrind].value_raw_beginning - ctx->text)
+#define ATTR_SIZE(tag, attrind) \
+ (tag->attrs[attrind].value_raw_size)
+
+/* Append LINK_URI to the urlpos structure that is being built.
+
+   LINK_URI will be merged with the current document base.
+*/
+
+struct urlpos *
+append_url (const char *link_uri, int position, int size,
+            struct map_context *ctx)
+{
+  int link_has_scheme = url_has_scheme (link_uri);
+  struct urlpos *newel;
+  const char *base = ctx->base ? ctx->base : ctx->parent_base;
+  struct url *url;
+
+  struct iri *iri = iri_new ();
+  set_uri_encoding (iri, opt.locale, true);
+  iri->utf8_encode = true;
+
+  if (!base)
+    {
+      DEBUGP (("%s: no base, merge will use \"%s\".\n",
+               ctx->document_file, link_uri));
+
+      if (!link_has_scheme)
+        {
+          /* Base URL is unavailable, and the link does not have a
+             location attached to it -- we have to give up.  Since
+             this can only happen when using `--force-html -i', print
+             a warning.  */
+          logprintf (LOG_NOTQUIET,
+                     _("%s: Cannot resolve incomplete link %s.\n"),
+                     ctx->document_file, link_uri);
+          iri_free (iri);
+          return NULL;
+        }
+
+      url = url_parse (link_uri, NULL, iri, false);
+      if (!url)
+        {
+          DEBUGP (("%s: link \"%s\" doesn't parse.\n",
+                   ctx->document_file, link_uri));
+          iri_free (iri);
+          return NULL;
+        }
+    }
+  else
+    {
+      /* Merge BASE with LINK_URI, but also make sure the result is
+         canonicalized, i.e. that "../" have been resolved.
+         (parse_url will do that for us.) */
+
+      char *complete_uri = uri_merge (base, link_uri);
+
+      DEBUGP (("%s: merge(%s, %s) -> %s\n",
+               quotearg_n_style (0, escape_quoting_style, ctx->document_file),
+               quote_n (1, base),
+               quote_n (2, link_uri),
+               quotearg_n_style (3, escape_quoting_style, complete_uri)));
+
+      url = url_parse (complete_uri, NULL, iri, false);
+      if (!url)
+        {
+          DEBUGP (("%s: merged link \"%s\" doesn't parse.\n",
+                   ctx->document_file, complete_uri));
+          xfree (complete_uri);
+          iri_free (iri);
+          return NULL;
+        }
+      xfree (complete_uri);
+    }
+
+  iri_free (iri);
+
+  DEBUGP (("appending %s to urlpos.\n", quote (url->url)));
+
+  newel = xnew0 (struct urlpos);
+  newel->url = url;
+  newel->pos = position;
+  newel->size = size;
+
+  /* A URL is relative if the host is not named, and the name does not
+     start with `/'.  */
+  if (!link_has_scheme && *link_uri != '/')
+    newel->link_relative_p = 1;
+  else if (link_has_scheme)
+    newel->link_complete_p = 1;
+
+  /* Append the new URL maintaining the order by position.  */
+  if (ctx->head == NULL)
+    ctx->head = newel;
+  else
+    {
+      struct urlpos *it, *prev = NULL;
+
+      it = ctx->head;
+      while (it && position > it->pos)
+        {
+          prev = it;
+          it = it->next;
+        }
+
+      newel->next = it;
+
+      if (prev)
+        prev->next = newel;
+      else
+        ctx->head = newel;
+    }
+
+  return newel;
+}
+
+static void
+check_style_attr (struct taginfo *tag, struct map_context *ctx)
+{
+  int attrind;
+  int raw_start;
+  int raw_len;
+  char *style = find_attr (tag, "style", &attrind);
+  if (!style)
+    return;
+
+  /* raw pos and raw size include the quotes, skip them when they are
+     present.  */
+  raw_start = ATTR_POS (tag, attrind, ctx);
+  raw_len  = ATTR_SIZE (tag, attrind);
+  if( *(char *)(ctx->text + raw_start) == '\''
+      || *(char *)(ctx->text + raw_start) == '"')
+    {
+      raw_start += 1;
+      raw_len -= 2;
+    }
+
+  if(raw_len <= 0)
+       return;
+
+  get_urls_css (ctx, raw_start, raw_len);
+}
+
+/* All the tag_* functions are called from collect_tags_mapper, as
+   specified by KNOWN_TAGS.  */
+
+/* Default tag handler: collect URLs from attributes specified for
+   this tag by tag_url_attributes.  */
+
+static void
+tag_find_urls (int tagid, struct taginfo *tag, struct map_context *ctx)
+{
+  size_t i;
+  int attrind;
+  int first = -1;
+
+  for (i = 0; i < countof (tag_url_attributes); i++)
+    if (tag_url_attributes[i].tagid == tagid)
+      {
+        /* We've found the index of tag_url_attributes where the
+           attributes of our tag begin.  */
+        first = i;
+        break;
+      }
+  assert (first != -1);
+
+  /* Loop over the "interesting" attributes of this tag.  In this
+     example, it will loop over "src" and "lowsrc".
+
+       <img src="foo.png" lowsrc="bar.png">
+
+     This has to be done in the outer loop so that the attributes are
+     processed in the same order in which they appear in the page.
+     This is required when converting links.  */
+
+  for (attrind = 0; attrind < tag->nattrs; attrind++)
+    {
+      /* Find whether TAG/ATTRIND is a combination that contains a
+         URL. */
+      char *link = tag->attrs[attrind].value;
+      const size_t size = countof (tag_url_attributes);
+
+      /* If you're cringing at the inefficiency of the nested loops,
+         remember that they both iterate over a very small number of
+         items.  The worst-case inner loop is for the IMG tag, which
+         has three attributes.  */
+      for (i = first; i < size && tag_url_attributes[i].tagid == tagid; i++)
+        {
+          if (0 == strcasecmp (tag->attrs[attrind].name,
+                               tag_url_attributes[i].attr_name))
+            {
+              struct urlpos *up = append_url (link, ATTR_POS(tag,attrind,ctx),
+                                              ATTR_SIZE(tag,attrind), ctx);
+              if (up)
+                {
+                  int flags = tag_url_attributes[i].flags;
+                  if (flags & ATTR_INLINE)
+                    up->link_inline_p = 1;
+                  if (flags & ATTR_HTML)
+                    up->link_expect_html = 1;
+                }
+            }
+        }
+    }
+}
+
+/* Handle the BASE tag, for <base href=...>. */
+
+static void
+tag_handle_base (int tagid _GL_UNUSED, struct taginfo *tag, struct map_context *ctx)
+{
+  struct urlpos *base_urlpos;
+  int attrind;
+  char *newbase = find_attr (tag, "href", &attrind);
+  if (!newbase)
+    return;
+
+  base_urlpos = append_url (newbase, ATTR_POS(tag,attrind,ctx),
+                            ATTR_SIZE(tag,attrind), ctx);
+  if (!base_urlpos)
+    return;
+  base_urlpos->ignore_when_downloading = 1;
+  base_urlpos->link_base_p = 1;
+
+  xfree (ctx->base);
+  if (ctx->parent_base)
+    ctx->base = uri_merge (ctx->parent_base, newbase);
+  else
+    ctx->base = xstrdup (newbase);
+}
+
+/* Mark the URL found in <form action=...> for conversion. */
+
+static void
+tag_handle_form (int tagid _GL_UNUSED, struct taginfo *tag, struct map_context *ctx)
+{
+  int attrind;
+  char *action = find_attr (tag, "action", &attrind);
+
+  if (action)
+    {
+      struct urlpos *up = append_url (action, ATTR_POS(tag,attrind,ctx),
+                                      ATTR_SIZE(tag,attrind), ctx);
+      if (up)
+        up->ignore_when_downloading = 1;
+    }
+}
+
+/* Handle the LINK tag.  It requires special handling because how its
+   links will be followed in -p mode depends on the REL attribute.  */
+
+static void
+tag_handle_link (int tagid _GL_UNUSED, struct taginfo *tag, struct map_context *ctx)
+{
+  int attrind;
+  char *href = find_attr (tag, "href", &attrind);
+
+  /* All <link href="..."> link references are external, except those
+     known not to be, such as style sheet and shortcut icon:
+
+     <link rel="stylesheet" href="..."> or <link rel="alternate stylesheet" href="...">
+     <link rel="shortcut icon" href="..."> or <link rel="icon" href="...">
+  */
+  if (href)
+    {
+      struct urlpos *up = append_url (href, ATTR_POS(tag,attrind,ctx),
+                                      ATTR_SIZE(tag,attrind), ctx);
+      if (up)
+        {
+          char *rel = find_attr (tag, "rel", NULL);
+          if (rel)
+            {
+              if (0 == c_strcasecmp (rel, "stylesheet") || 0 == c_strcasecmp (rel, "alternate stylesheet"))
+                {
+                  up->link_inline_p = 1;
+                  up->link_expect_css = 1;
+                }
+              else if (0 == c_strcasecmp (rel, "shortcut icon") || 0 == c_strcasecmp (rel, "icon"))
+                {
+                  up->link_inline_p = 1;
+                }
+              else if (0 == c_strcasecmp (rel, "manifest"))
+                {
+                  up->link_inline_p = 1;
+                }
+              else
+                {
+                  /* The external ones usually point to HTML pages, such as
+                     <link rel="next" href="...">
+                     except when the type attribute says otherwise:
+                     <link rel="alternate" type="application/rss+xml" href=".../?feed=rss2" />
+                  */
+                  char *type = find_attr (tag, "type", NULL);
+                  if (!type || c_strcasecmp (type, "text/html") == 0)
+                    up->link_expect_html = 1;
+                }
+            }
+        }
+    }
+}
+
+/* Handle the META tag.  This requires special handling because of the
+   refresh feature and because of robot exclusion.  */
+
+static void
+tag_handle_meta (int tagid _GL_UNUSED, struct taginfo *tag, struct map_context *ctx)
+{
+  char *name = find_attr (tag, "name", NULL);
+  char *http_equiv = find_attr (tag, "http-equiv", NULL);
+
+  if (http_equiv && 0 == c_strcasecmp (http_equiv, "refresh"))
+    {
+      /* Some pages use a META tag to specify that the page be
+         refreshed by a new page after a given number of seconds.  The
+         general format for this is:
+
+           <meta http-equiv=Refresh content="NUMBER; URL=index2.html">
+
+         So we just need to skip past the "NUMBER; URL=" garbage to
+         get to the URL.  */
+
+      struct urlpos *entry;
+      int attrind;
+      int timeout;
+      char *p;
+
+      char *refresh = find_attr (tag, "content", &attrind);
+      if (!refresh)
+        return;
+
+      timeout = strtol(refresh, &p, 10);
+
+      if (timeout < 0 || *p++ != ';')
+        return;
+
+      while (c_isspace (*p))
+        ++p;
+      if (!(   c_toupper (*p)       == 'U'
+            && c_toupper (*(p + 1)) == 'R'
+            && c_toupper (*(p + 2)) == 'L'
+            &&          *(p + 3)  == '='))
+        return;
+      p += 4;
+      while (c_isspace (*p))
+        ++p;
+
+      entry = append_url (p, ATTR_POS(tag,attrind,ctx),
+                          ATTR_SIZE(tag,attrind), ctx);
+      if (entry)
+        {
+          entry->link_refresh_p = 1;
+          entry->refresh_timeout = timeout;
+          entry->link_expect_html = 1;
+        }
+    }
+  else if (http_equiv && 0 == c_strcasecmp (http_equiv, "content-type"))
+    {
+      /* Handle stuff like:
+         <meta http-equiv="Content-Type" content="text/html; charset=CHARSET"> */
+
+      char *mcharset;
+      char *content = find_attr (tag, "content", NULL);
+      if (!content)
+        return;
+
+      mcharset = parse_charset (content);
+      if (!mcharset)
+        return;
+
+      xfree (meta_charset);
+      meta_charset = mcharset;
+    }
+  else if (name && 0 == c_strcasecmp (name, "robots"))
+    {
+      /* Handle stuff like:
+         <meta name="robots" content="index,nofollow"> */
+      char *content = find_attr (tag, "content", NULL);
+      if (!content)
+        return;
+      if (!c_strcasecmp (content, "none"))
+        ctx->nofollow = true;
+      else
+        {
+          while (*content)
+            {
+              char *end;
+              /* Skip any initial whitespace. */
+              content += strspn (content, " \f\n\r\t\v");
+              /* Find the next occurrence of ',' or whitespace,
+               * or the end of the string.  */
+              end = content + strcspn (content, ", \f\n\r\t\v");
+              if (!c_strncasecmp (content, "nofollow", end - content))
+                ctx->nofollow = true;
+              /* Skip past the next comma, if any. */
+              if (*end == ',')
+                ++end;
+              else
+                {
+                  end = strchr (end, ',');
+                  if (end)
+                    ++end;
+                  else
+                    end = content + strlen (content);
+                }
+              content = end;
+            }
+        }
+    }
+}
+
+/* Handle the IMG tag.  This requires special handling for the srcset attr,
+   while the traditional src/lowsrc/href attributes can be handled generically.
+*/
+
+static void
+tag_handle_img (int tagid, struct taginfo *tag, struct map_context *ctx) {
+  int attrind;
+  char *srcset;
+
+  /* Use the generic approach for the attributes without special syntax. */
+  tag_find_urls(tagid, tag, ctx);
+
+  srcset = find_attr (tag, "srcset", &attrind);
+  if (srcset)
+    {
+      /* These are relative to the input text. */
+      int base_ind = ATTR_POS (tag,attrind,ctx);
+      int size = strlen (srcset);
+
+      /* These are relative to srcset. */
+      int offset, url_start, url_end;
+
+      /* Make sure to line up base_ind with srcset[0], not outside quotes. */
+      if (ctx->text[base_ind] == '"' || ctx->text[base_ind] == '\'')
+        ++base_ind;
+
+      offset = 0;
+      while (offset < size)
+        {
+          bool has_descriptor = true;
+
+          /* Skip over initial whitespace and commas. Note there is no \v
+            in HTML5 whitespace. */
+          url_start = offset + strspn (srcset + offset, " \f\n\r\t,");
+
+          if (url_start == size)
+            return;
+
+          /* URL is any non-whitespace chars (including commas) - but with
+             trailing commas removed. */
+          url_end = url_start + strcspn (srcset + url_start, " \f\n\r\t");
+          while ((url_end - 1) > url_start && srcset[url_end - 1] == ',')
+            {
+              has_descriptor = false;
+              --url_end;
+            }
+
+          if (url_end > url_start)
+            {
+              char *url_text = strdupdelim (srcset + url_start,
+                                            srcset + url_end);
+              struct urlpos *up = append_url (url_text, base_ind + url_start,
+                                              url_end - url_start, ctx);
+              if (up)
+                {
+                  up->link_inline_p = 1;
+                  up->link_noquote_html_p = 1;
+                }
+              xfree (url_text);
+            }
+
+          /* If the URL wasn't terminated by a , there may also be a descriptor
+             which we just skip. */
+          if (has_descriptor)
+            {
+              /* This is comma-terminated, except there may be one level of
+                 parentheses escaping that. */
+              bool in_paren = false;
+              for (offset = url_end; offset < size; ++offset)
+                {
+                  char c = srcset[offset];
+                  if (c == '(')
+                    in_paren = true;
+                  else if (c == ')' && in_paren)
+                    in_paren = false;
+                  else if (c == ',' && !in_paren)
+                    break;
+                }
+            }
+          else
+            offset = url_end;
+        }
+    }
+}
+
+/* Dispatch the tag handler appropriate for the tag we're mapping
+   over.  See known_tags[] for definition of tag handlers.  */
+
+static void
+collect_tags_mapper (struct taginfo *tag, void *arg)
+{
+  struct map_context *ctx = (struct map_context *)arg;
+
+  /* Find the tag in our table of tags.  This must not fail because
+     map_html_tags only returns tags found in interesting_tags.
+
+     I've changed this for now, I'm passing NULL as interesting_tags
+     to map_html_tags.  This way we can check all tags for a style
+     attribute.
+  */
+  struct known_tag *t = hash_table_get (interesting_tags, tag->name);
+
+  if (t != NULL)
+    t->handler (t->tagid, tag, ctx);
+
+  check_style_attr (tag, ctx);
+
+  if (tag->end_tag_p && (0 == c_strcasecmp (tag->name, "style"))
+      && tag->contents_begin && tag->contents_end
+      && tag->contents_begin <= tag->contents_end)
+  {
+    /* parse contents */
+    get_urls_css (ctx, tag->contents_begin - ctx->text,
+                  tag->contents_end - tag->contents_begin);
+  }
+}
+
+/* Analyze HTML tags FILE and construct a list of URLs referenced from
+   it.  It merges relative links in FILE with URL.  It is aware of
+   <base href=...> and does the right thing.  */
+
+struct urlpos *
+get_urls_html_fm (const char *file, const struct file_memory *fm,
+                    const char *url, bool *meta_disallow_follow,
+                    struct iri *iri)
+{
+  struct map_context ctx;
+  int flags;
+
+  ctx.text = fm->content;
+  ctx.head = NULL;
+  ctx.base = NULL;
+  ctx.parent_base = url ? url : opt.base_href;
+  ctx.document_file = file;
+  ctx.nofollow = false;
+
+  if (!interesting_tags)
+    init_interesting ();
+
+  /* Specify MHT_TRIM_VALUES because of buggy HTML generators that
+     generate <a href=" foo"> instead of <a href="foo"> (browsers
+     ignore spaces as well.)  If you really mean space, use &32; or
+     %20.  MHT_TRIM_VALUES also causes squashing of embedded newlines,
+     e.g. in <img src="foo.[newline]html">.  Such newlines are also
+     ignored by IE and Mozilla and are presumably introduced by
+     writing HTML with editors that force word wrap.  */
+  flags = MHT_TRIM_VALUES;
+  if (opt.strict_comments)
+    flags |= MHT_STRICT_COMMENTS;
+
+  /* the NULL here used to be interesting_tags */
+  map_html_tags (fm->content, fm->length, collect_tags_mapper, &ctx, flags,
+                 NULL, interesting_attributes);
+
+#ifdef ENABLE_IRI
+  /* Meta charset is only valid if there was no HTTP header Content-Type charset. */
+  /* This is true for HTTP 1.0 and 1.1. */
+  if (iri && !iri->content_encoding && meta_charset)
+    set_content_encoding (iri, meta_charset);
+#endif
+  xfree (meta_charset);
+
+  DEBUGP (("nofollow in %s: %d\n", file, ctx.nofollow));
+
+  if (meta_disallow_follow)
+    *meta_disallow_follow = ctx.nofollow;
+
+  xfree (ctx.base);
+  return ctx.head;
+}
+
+struct urlpos *
+get_urls_html (const char *file, const char *url, bool *meta_disallow_follow,
+                 struct iri *iri)
+{
+  struct urlpos *urls;
+  struct file_memory *fm;
+
+  fm = wget_read_file (file);
+  if (!fm)
+    {
+      logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno));
+      return NULL;
+    }
+  DEBUGP (("Loaded %s (size %s).\n", file, number_to_static_string (fm->length)));
+
+  urls = get_urls_html_fm (file, fm, url, meta_disallow_follow, iri);
+  wget_read_file_free (fm);
+  return urls;
+}
+
+/* This doesn't really have anything to do with HTML, but it's similar
+   to get_urls_html, so we put it here.  */
+
+struct urlpos *
+get_urls_file (const char *file)
+{
+  struct file_memory *fm;
+  struct urlpos *head, *tail;
+  const char *text, *text_end;
+
+  /* Load the file.  */
+  fm = wget_read_file (file);
+  if (!fm)
+    {
+      logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno));
+      return NULL;
+    }
+  DEBUGP (("Loaded %s (size %s).\n", file, number_to_static_string (fm->length)));
+
+  head = tail = NULL;
+  text = fm->content;
+  text_end = fm->content + fm->length;
+  while (text < text_end)
+    {
+      int up_error_code;
+      char *url_text;
+      char *new_url;
+      struct urlpos *entry;
+      struct url *url;
+
+      const char *line_beg = text;
+      const char *line_end = memchr (text, '\n', text_end - text);
+      if (!line_end)
+        line_end = text_end;
+      else
+        ++line_end;
+      text = line_end;
+
+      /* Strip whitespace from the beginning and end of line. */
+      while (line_beg < line_end && c_isspace (*line_beg))
+        ++line_beg;
+      while (line_end > line_beg && c_isspace (*(line_end - 1)))
+        --line_end;
+
+      if (line_beg == line_end)
+        continue;
+
+      /* The URL is in the [line_beg, line_end) region. */
+
+      /* We must copy the URL to a zero-terminated string, and we
+         can't use alloca because we're in a loop.  *sigh*.  */
+      url_text = strdupdelim (line_beg, line_end);
+
+      if (opt.base_href)
+        {
+          /* Merge opt.base_href with URL. */
+          char *merged = uri_merge (opt.base_href, url_text);
+          xfree (url_text);
+          url_text = merged;
+        }
+
+      new_url = rewrite_shorthand_url (url_text);
+      if (new_url)
+        {
+          xfree (url_text);
+          url_text = new_url;
+        }
+
+      url = url_parse (url_text, &up_error_code, NULL, false);
+      if (!url)
+        {
+          char *error = url_error (url_text, up_error_code);
+          logprintf (LOG_NOTQUIET, _("%s: Invalid URL %s: %s\n"),
+                     file, url_text, error);
+          xfree (url_text);
+          xfree (error);
+          inform_exit_status (URLERROR);
+          continue;
+        }
+      xfree (url_text);
+
+      entry = xnew0 (struct urlpos);
+      entry->url = url;
+
+      if (!head)
+        head = entry;
+      else
+        tail->next = entry;
+      tail = entry;
+    }
+  wget_read_file_free (fm);
+  return head;
+}
+
+#if defined DEBUG_MALLOC || defined TESTING
+void
+cleanup_html_url (void)
+{
+  /* Destroy the hash tables.  The hash table keys and values are not
+     allocated by this code, so we don't need to free them here.  */
+  if (interesting_tags)
+    hash_table_destroy (interesting_tags);
+  if (interesting_attributes)
+    hash_table_destroy (interesting_attributes);
+}
+#endif