Move googleurl into the Chrome repo.

url/url_parse_file.cc

+// Copyright 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/logging.h"
+#include "googleurl/src/url_file.h"
+#include "googleurl/src/url_parse.h"
+#include "googleurl/src/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_parse {
+
+namespace {
+
+// A subcomponent of DoInitFileURL, 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
+// (DoInitFileURL 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);
+  if (next_slash == spec_len) {
+    // No additional slash found, as in "file://foo", treat the text as the
+    // host with no path (this will end up being UNC to server "foo").
+    int host_len = spec_len - after_slashes;
+    if (host_len)
+      parsed->host = Component(after_slashes, host_len);
+    else
+      parsed->host.reset();
+    parsed->path.reset();
+    return;
+  }
+
+#ifdef WIN32
+  // See if we have something that looks like a path following the first
+  // component. As in "file://localhost/c:/", we get "c:/" out. We want to
+  // treat this as a having no host but the path given. Works on Windows only.
+  if (DoesBeginWindowsDriveSpec(spec, next_slash + 1, spec_len)) {
+    parsed->host.reset();
+    ParsePathInternal(spec, MakeRange(next_slash, spec_len),
+                      &parsed->path, &parsed->query, &parsed->ref);
+    return;
+  }
+#endif
+
+  // Otherwise, everything up until that first slash we found 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.
+  int host_len = next_slash - after_slashes;
+  if (host_len)
+    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 (DoInitFileURL 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.
+// We are handed the character after the "file:" at the beginning of the spec.
+// Usually this is 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.
+  int num_slashes;
+  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".
+  num_slashes = CountConsecutiveSlashes(spec, begin, spec_len);
+  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
+  {
+    if (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* url, int url_len, Parsed* parsed) {
+  DoParseFileURL(url, url_len, parsed);
+}
+
+}  // namespace url_parse