NS_IMETHODIMP
nsFileProtocolHandler::NewURI(const nsACString &spec,
                              const char *charset,
                              nsIURI *baseURI,
                              nsIURI **result)
{
    nsCOMPtr<nsIStandardURL> url = new nsStandardURL(true);
    if (!url)
        return NS_ERROR_OUT_OF_MEMORY;

    const nsACString *specPtr = &spec;

#if defined(XP_WIN)
    nsAutoCString buf;
    if (net_NormalizeFileURL(spec, buf))
        specPtr = &buf;
#endif

    nsresult rv = url->Init(nsIStandardURL::URLTYPE_NO_AUTHORITY, -1,
                            *specPtr, charset, baseURI);
    if (NS_FAILED(rv)) return rv;

    return CallQueryInterface(url, result);
}
nsresult
net_GetFileFromURLSpec(const nsACString &aURL, nsIFile **result)
{
    nsresult rv;

    nsCOMPtr<nsIFile> localFile(
            do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
    if (NS_FAILED(rv)) {
        NS_ERROR("Only nsIFile supported right now");
        return rv;
    }

    localFile->SetFollowLinks(true);

    const nsACString *specPtr;

    nsAutoCString buf;
    if (net_NormalizeFileURL(aURL, buf))
        specPtr = &buf;
    else
        specPtr = &aURL;
    
    nsAutoCString directory, fileBaseName, fileExtension;
    
    rv = net_ParseFileURL(*specPtr, directory, fileBaseName, fileExtension);
    if (NS_FAILED(rv)) return rv;

    nsAutoCString path;

    if (!directory.IsEmpty()) {
        NS_EscapeURL(directory, esc_Directory|esc_AlwaysCopy, path);
        if (path.Length() > 2 && path.CharAt(2) == '|')
            path.SetCharAt(':', 2);
        path.ReplaceChar('/', '\\');
    }    
    if (!fileBaseName.IsEmpty())
        NS_EscapeURL(fileBaseName, esc_FileBaseName|esc_AlwaysCopy, path);
    if (!fileExtension.IsEmpty()) {
        path += '.';
        NS_EscapeURL(fileExtension, esc_FileExtension|esc_AlwaysCopy, path);
    }
    
    NS_UnescapeURL(path);
    if (path.Length() != strlen(path.get()))
        return NS_ERROR_FILE_INVALID_PATH;

    // remove leading '\'
    if (path.CharAt(0) == '\\')
        path.Cut(0, 1);

    if (IsUTF8(path))
        rv = localFile->InitWithPath(NS_ConvertUTF8toUTF16(path));
        // XXX In rare cases, a valid UTF-8 string can be valid as a native 
        // encoding (e.g. 0xC5 0x83 is valid both as UTF-8 and Windows-125x).
        // However, the chance is very low that a meaningful word in a legacy
        // encoding is valid as UTF-8.
    else 
        // if path is not in UTF-8, assume it is encoded in the native charset
        rv = localFile->InitWithNativePath(path);

    if (NS_FAILED(rv)) return rv;

    NS_ADDREF(*result = localFile);
    return NS_OK;
}