Revert 262487 "Add net/base/filename_util.h."

trunk/src/net/base/net_util_win.cc

Index: trunk/src/net/base/net_util_win.cc
===================================================================
--- trunk/src/net/base/net_util_win.cc	(revision 262497)
+++ trunk/src/net/base/net_util_win.cc	(working copy)
@@ -85,6 +85,59 @@
 
 namespace net {
 
+bool FileURLToFilePath(const GURL& url, base::FilePath* file_path) {
+  *file_path = base::FilePath();
+  std::wstring& file_path_str = const_cast<std::wstring&>(file_path->value());
+  file_path_str.clear();
+
+  if (!url.is_valid())
+    return false;
+
+  std::string path;
+  std::string host = url.host();
+  if (host.empty()) {
+    // URL contains no host, the path is the filename. In this case, the path
+    // will probably be preceeded with a slash, as in "/C:/foo.txt", so we
+    // trim out that here.
+    path = url.path();
+    size_t first_non_slash = path.find_first_not_of("/\\");
+    if (first_non_slash != std::string::npos && first_non_slash > 0)
+      path.erase(0, first_non_slash);
+  } else {
+    // URL contains a host: this means it's UNC. We keep the preceeding slash
+    // on the path.
+    path = "\\\\";
+    path.append(host);
+    path.append(url.path());
+  }
+
+  if (path.empty())
+    return false;
+  std::replace(path.begin(), path.end(), '/', '\\');
+
+  // GURL stores strings as percent-encoded UTF-8, this will undo if possible.
+  path = UnescapeURLComponent(path,
+      UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
+
+  if (!IsStringUTF8(path)) {
+    // Not UTF-8, assume encoding is native codepage and we're done. We know we
+    // are giving the conversion function a nonempty string, and it may fail if
+    // the given string is not in the current encoding and give us an empty
+    // string back. We detect this and report failure.
+    file_path_str = base::SysNativeMBToWide(path);
+    return !file_path_str.empty();
+  }
+  file_path_str.assign(base::UTF8ToWide(path));
+
+  // We used to try too hard and see if |path| made up entirely of
+  // the 1st 256 characters in the Unicode was a zero-extended UTF-16.
+  // If so, we converted it to 'Latin-1' and checked if the result was UTF-8.
+  // If the check passed, we converted the result to UTF-8.
+  // Otherwise, we treated the result as the native OS encoding.
+  // However, that led to http://crbug.com/4619 and http://crbug.com/14153
+  return true;
+}
+
 bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
   // GetAdaptersAddresses() may require IO operations.
   base::ThreadRestrictions::AssertIOAllowed();