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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/check.h"
- #include "url/third_party/mozilla/url_parse.h"
- #include "url/url_file.h"
- #include "url/url_parse_internal.h"
- // Interesting IE file:isms...
- //
- // INPUT OUTPUT
- // ========================= ==============================
- // file:/foo/bar file:///foo/bar
- // The result here seems totally invalid!?!? This isn't UNC.
- //
- // file:/
- // file:// or any other number of slashes
- // IE6 doesn't do anything at all if you click on this link. No error:
- // nothing. IE6's history system seems to always color this link, so I'm
- // guessing that it maps internally to the empty URL.
- //
- // C:\ file:///C:/
- // When on a file: URL source page, this link will work. When over HTTP,
- // the file: URL will appear in the status bar but the link will not work
- // (security restriction for all file URLs).
- //
- // file:foo/ file:foo/ (invalid?!?!?)
- // file:/foo/ file:///foo/ (invalid?!?!?)
- // file://foo/ file://foo/ (UNC to server "foo")
- // file:///foo/ file:///foo/ (invalid, seems to be a file)
- // file:////foo/ file://foo/ (UNC to server "foo")
- // Any more than four slashes is also treated as UNC.
- //
- // file:C:/ file://C:/
- // file:/C:/ file://C:/
- // The number of slashes after "file:" don't matter if the thing following
- // it looks like an absolute drive path. Also, slashes and backslashes are
- // equally valid here.
- namespace url {
- namespace {
- // A subcomponent of DoParseFileURL, the input of this function should be a UNC
- // path name, with the index of the first character after the slashes following
- // the scheme given in |after_slashes|. This will initialize the host, path,
- // query, and ref, and leave the other output components untouched
- // (DoParseFileURL handles these for us).
- template <typename CHAR>
- void DoParseUNC(const CHAR* spec,
- int after_slashes,
- int spec_len,
- Parsed* parsed) {
- int next_slash = FindNextSlash(spec, after_slashes, spec_len);
- // Everything up until that first slash we found (or end of string) is the
- // host name, which will end up being the UNC host. For example,
- // "file://foo/bar.txt" will get a server name of "foo" and a path of "/bar".
- // Later, on Windows, this should be treated as the filename "\\foo\bar.txt"
- // in proper UNC notation.
- if (after_slashes < next_slash)
- parsed->host = MakeRange(after_slashes, next_slash);
- else
- parsed->host.reset();
- if (next_slash < spec_len) {
- ParsePathInternal(spec, MakeRange(next_slash, spec_len),
- &parsed->path, &parsed->query, &parsed->ref);
- } else {
- parsed->path.reset();
- }
- }
- // A subcomponent of DoParseFileURL, the input should be a local file, with the
- // beginning of the path indicated by the index in |path_begin|. This will
- // initialize the host, path, query, and ref, and leave the other output
- // components untouched (DoParseFileURL handles these for us).
- template<typename CHAR>
- void DoParseLocalFile(const CHAR* spec,
- int path_begin,
- int spec_len,
- Parsed* parsed) {
- parsed->host.reset();
- ParsePathInternal(spec, MakeRange(path_begin, spec_len),
- &parsed->path, &parsed->query, &parsed->ref);
- }
- // Backend for the external functions that operates on either char type.
- // Handles cases where there is a scheme, but also when handed the first
- // character following the "file:" at the beginning of the spec. If so,
- // this is usually a slash, but needn't be; we allow paths like "file:c:\foo".
- template<typename CHAR>
- void DoParseFileURL(const CHAR* spec, int spec_len, Parsed* parsed) {
- DCHECK(spec_len >= 0);
- // Get the parts we never use for file URLs out of the way.
- parsed->username.reset();
- parsed->password.reset();
- parsed->port.reset();
- // Many of the code paths don't set these, so it's convenient to just clear
- // them. We'll write them in those cases we need them.
- parsed->query.reset();
- parsed->ref.reset();
- // Strip leading & trailing spaces and control characters.
- int begin = 0;
- TrimURL(spec, &begin, &spec_len);
- // Find the scheme, if any.
- int num_slashes = CountConsecutiveSlashes(spec, begin, spec_len);
- int after_scheme;
- int after_slashes;
- #ifdef WIN32
- // See how many slashes there are. We want to handle cases like UNC but also
- // "/c:/foo". This is when there is no scheme, so we can allow pages to do
- // links like "c:/foo/bar" or "//foo/bar". This is also called by the
- // relative URL resolver when it determines there is an absolute URL, which
- // may give us input like "/c:/foo".
- after_slashes = begin + num_slashes;
- if (DoesBeginWindowsDriveSpec(spec, after_slashes, spec_len)) {
- // Windows path, don't try to extract the scheme (for example, "c:\foo").
- parsed->scheme.reset();
- after_scheme = after_slashes;
- } else if (DoesBeginUNCPath(spec, begin, spec_len, false)) {
- // Windows UNC path: don't try to extract the scheme, but keep the slashes.
- parsed->scheme.reset();
- after_scheme = begin;
- } else
- #endif
- {
- // ExtractScheme doesn't understand the possibility of filenames with
- // colons in them, in which case it returns the entire spec up to the
- // colon as the scheme. So handle /foo.c:5 as a file but foo.c:5 as
- // the foo.c: scheme.
- if (!num_slashes &&
- ExtractScheme(&spec[begin], spec_len - begin, &parsed->scheme)) {
- // Offset the results since we gave ExtractScheme a substring.
- parsed->scheme.begin += begin;
- after_scheme = parsed->scheme.end() + 1;
- } else {
- // No scheme found, remember that.
- parsed->scheme.reset();
- after_scheme = begin;
- }
- }
- // Handle empty specs ones that contain only whitespace or control chars,
- // or that are just the scheme (for example "file:").
- if (after_scheme == spec_len) {
- parsed->host.reset();
- parsed->path.reset();
- return;
- }
- num_slashes = CountConsecutiveSlashes(spec, after_scheme, spec_len);
- after_slashes = after_scheme + num_slashes;
- #ifdef WIN32
- // Check whether the input is a drive again. We checked above for windows
- // drive specs, but that's only at the very beginning to see if we have a
- // scheme at all. This test will be duplicated in that case, but will
- // additionally handle all cases with a real scheme such as "file:///C:/".
- if (!DoesBeginWindowsDriveSpec(spec, after_slashes, spec_len) &&
- num_slashes != 3) {
- // Anything not beginning with a drive spec ("c:\") on Windows is treated
- // as UNC, with the exception of three slashes which always means a file.
- // Even IE7 treats file:///foo/bar as "/foo/bar", which then fails.
- DoParseUNC(spec, after_slashes, spec_len, parsed);
- return;
- }
- #else
- // file: URL with exactly 2 slashes is considered to have a host component.
- if (num_slashes == 2) {
- DoParseUNC(spec, after_slashes, spec_len, parsed);
- return;
- }
- #endif // WIN32
- // Easy and common case, the full path immediately follows the scheme
- // (modulo slashes), as in "file://c:/foo". Just treat everything from
- // there to the end as the path. Empty hosts have 0 length instead of -1.
- // We include the last slash as part of the path if there is one.
- DoParseLocalFile(spec,
- num_slashes > 0 ? after_scheme + num_slashes - 1 : after_scheme,
- spec_len, parsed);
- }
- } // namespace
- void ParseFileURL(const char* url, int url_len, Parsed* parsed) {
- DoParseFileURL(url, url_len, parsed);
- }
- void ParseFileURL(const char16_t* url, int url_len, Parsed* parsed) {
- DoParseFileURL(url, url_len, parsed);
- }
- } // namespace url
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