AI 145796: Land the WebKit merge @r42026.

Automated import of CL 145796

1 files changed, 944 insertions, 0 deletions

diff --git a/WebCore/platform/KURLGoogle.cpp b/WebCore/platform/KURLGoogle.cpp
new file mode 100644
index 0000000..c2e8272
--- /dev/null
+++ b/WebCore/platform/KURLGoogle.cpp
@@ -0,0 +1,944 @@
+/*
+ * Copyright (C) 2008, 2009 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 "config.h"
+
+#if USE(GOOGLEURL)
+#include "KURL.h"
+
+#ifndef NDEBUG
+#include <stdio.h>
+#endif
+
+#include "CString.h"
+#include "NotImplemented.h"
+#include "TextEncoding.h"
+#include <wtf/Vector.h>
+
+#include <googleurl/src/url_canon_internal.h>
+#include <googleurl/src/url_util.h>
+
+using WTF::isASCIILower;
+using WTF::toASCIILower;
+
+namespace WebCore {
+
+// Wraps WebCore's text encoding in a character set converter for the
+// canonicalizer.
+class KURLCharsetConverter : public url_canon::CharsetConverter {
+public:
+    // The encoding parameter may be NULL, but in this case the object must not
+    // be called.
+    KURLCharsetConverter(const TextEncoding* encoding)
+        : m_encoding(encoding)
+    {
+    }
+
+    virtual void ConvertFromUTF16(const url_parse::UTF16Char* input, int inputLength,
+                                  url_canon::CanonOutput* output)
+    {
+        CString encoded = m_encoding->encode(input, inputLength, URLEncodedEntitiesForUnencodables);
+        output->Append(encoded.data(), static_cast<int>(encoded.length()));
+    }
+
+private:
+    const TextEncoding* m_encoding;
+};
+
+// Note that this function must be named differently than the one in KURL.cpp
+// since our unit tests evilly include both files, and their local definition
+// will be ambiguous.
+static inline void assertProtocolIsGood(const char* protocol)
+{
+#ifndef NDEBUG
+    const char* p = protocol;
+    while (*p) {
+        ASSERT(*p > ' ' && *p < 0x7F && !(*p >= 'A' && *p <= 'Z'));
+        ++p;
+    }
+#endif
+}
+
+// Returns the characters for the given string, or a pointer to a static empty
+// string if the input string is NULL. This will always ensure we have a non-
+// NULL character pointer since ReplaceComponents has special meaning for NULL.
+static inline const url_parse::UTF16Char* CharactersOrEmpty(const String& str)
+{
+    static const url_parse::UTF16Char zero = 0;
+    return str.characters() ?
+           reinterpret_cast<const url_parse::UTF16Char*>(str.characters()) :
+           &zero;
+}
+
+static inline bool isUnicodeEncoding(const TextEncoding* encoding)
+{
+    return encoding->encodingForFormSubmission() == UTF8Encoding();
+}
+
+static bool lowerCaseEqualsASCII(const char* begin, const char* end, const char* str)
+{
+    while (begin != end && *str) {
+        ASSERT(isASCIILower(*str));
+        if (toASCIILower(*begin++) != *str++)
+            return false;
+    }
+
+    // Both strings are equal (ignoring case) if and only if all of the characters were equal,
+    // and the end of both has been reached.
+    return begin == end && !*str;
+}
+
+
+// KURLGooglePrivate -----------------------------------------------------------
+
+KURLGooglePrivate::KURLGooglePrivate()
+    : m_isValid(false)
+    , m_protocolInHTTPFamily(false)
+    , m_utf8IsASCII(true)
+    , m_stringIsValid(false)
+{
+}
+
+KURLGooglePrivate::KURLGooglePrivate(const url_parse::Parsed& parsed, bool isValid)
+    : m_isValid(isValid)
+    , m_protocolInHTTPFamily(false)
+    , m_parsed(parsed)
+    , m_utf8IsASCII(true)
+    , m_stringIsValid(false)
+{
+}
+
+// Setters for the data. Using the ASCII version when you know the
+// data is ASCII will be slightly more efficient. The UTF-8 version
+// will always be correct if the caller is unsure.
+void KURLGooglePrivate::setUtf8(const CString& str)
+{
+    const char* data = str.data();
+    unsigned dataLength = str.length();
+
+    // The m_utf8IsASCII must always be correct since the DeprecatedString
+    // getter must create it with the proper constructor. This test can be
+    // removed when DeprecatedString is gone, but it still might be a
+    // performance win.
+    m_utf8IsASCII = true;
+    for (unsigned i = 0; i < dataLength; i++) {
+        if (static_cast<unsigned char>(data[i]) >= 0x80) {
+            m_utf8IsASCII = false;
+            break;
+        }
+    }
+
+    m_utf8 = str;
+    m_stringIsValid = false;
+    initProtocolInHTTPFamily();
+}
+
+void KURLGooglePrivate::setAscii(const CString& str)
+{
+    m_utf8 = str;
+    m_utf8IsASCII = true;
+    m_stringIsValid = false;
+    initProtocolInHTTPFamily();
+}
+
+void KURLGooglePrivate::init(const KURL& base,
+                             const String& relative,
+                             const TextEncoding* queryEncoding)
+{
+    init(base, relative.characters(), relative.length(), queryEncoding);
+}
+
+// Note: code mostly duplicated below.
+void KURLGooglePrivate::init(const KURL& base, const char* rel, int relLength,
+                             const TextEncoding* queryEncoding)
+{
+    // As a performance optimization, we do not use the charset converter if
+    // encoding is UTF-8 or other Unicode encodings. Note that this is
+    // per HTML5 2.5.3 (resolving URL). The URL canonicalizer will be
+    // more efficient with no charset converter object because it
+    // can do UTF-8 internally with no extra copies.
+
+    // We feel free to make the charset converter object every time since it's
+    // just a wrapper around a reference.
+    KURLCharsetConverter charsetConverterObject(queryEncoding);
+    KURLCharsetConverter* charsetConverter =
+        (!queryEncoding || isUnicodeEncoding(queryEncoding)) ? 0 :
+        &charsetConverterObject;
+
+    url_canon::RawCanonOutputT<char> output;
+    const CString& baseStr = base.m_url.utf8String();
+    m_isValid = url_util::ResolveRelative(baseStr.data(), baseStr.length(),
+                                          base.m_url.m_parsed, rel, relLength,
+                                          charsetConverter,
+                                          &output, &m_parsed);
+
+    // See FIXME in KURLGooglePrivate in the header. If canonicalization has not
+    // changed the string, we can avoid an extra allocation by using assignment.
+    //
+    // When KURL encounters an error such that the URL is invalid and empty
+    // (for example, resolving a relative URL on a non-hierarchical base), it
+    // will produce an isNull URL, and calling setUtf8 will produce an empty
+    // non-null URL. This is unlikely to affect anything, but we preserve this
+    // just in case.
+    if (m_isValid || output.length()) {
+        // Without ref, the whole url is guaranteed to be ASCII-only.
+        if (m_parsed.ref.is_nonempty())
+            setUtf8(CString(output.data(), output.length()));
+        else
+            setAscii(CString(output.data(), output.length()));
+    } else {
+        // WebCore expects resolved URLs to be empty rather than NULL.
+        setUtf8(CString("", 0));
+    }
+}
+
+// Note: code mostly duplicated above. See FIXMEs and comments there.
+void KURLGooglePrivate::init(const KURL& base, const UChar* rel, int relLength,
+                             const TextEncoding* queryEncoding)
+{
+    KURLCharsetConverter charsetConverterObject(queryEncoding);
+    KURLCharsetConverter* charsetConverter =
+        (!queryEncoding || isUnicodeEncoding(queryEncoding)) ? 0 :
+        &charsetConverterObject;
+
+    url_canon::RawCanonOutputT<char> output;
+    const CString& baseStr = base.m_url.utf8String();
+    m_isValid = url_util::ResolveRelative(baseStr.data(), baseStr.length(),
+                                          base.m_url.m_parsed, rel, relLength,
+                                          charsetConverter,
+                                          &output, &m_parsed);
+
+    if (m_isValid || output.length()) {
+        if (m_parsed.ref.is_nonempty())
+            setUtf8(CString(output.data(), output.length()));
+        else
+            setAscii(CString(output.data(), output.length()));
+    } else
+        setUtf8(CString("", 0));
+}
+
+void KURLGooglePrivate::initProtocolInHTTPFamily()
+{
+    if (!m_isValid) {
+        m_protocolInHTTPFamily = false;
+        return;
+    }
+
+    const char* scheme = m_utf8.data() + m_parsed.scheme.begin;
+    if (m_parsed.scheme.len == 4)
+        m_protocolInHTTPFamily = lowerCaseEqualsASCII(scheme, scheme + 4, "http");
+    else if (m_parsed.scheme.len == 5)
+        m_protocolInHTTPFamily = lowerCaseEqualsASCII(scheme, scheme + 5, "https");
+    else
+        m_protocolInHTTPFamily = false;
+}
+
+void KURLGooglePrivate::copyTo(KURLGooglePrivate* dest) const
+{
+    dest->m_isValid = m_isValid;
+    dest->m_protocolInHTTPFamily = m_protocolInHTTPFamily;
+    dest->m_parsed = m_parsed;
+
+    // Don't copy the 16-bit string since that will be regenerated as needed.
+    dest->m_utf8 = CString(m_utf8.data(), m_utf8.length());
+    dest->m_utf8IsASCII = m_utf8IsASCII;
+    dest->m_stringIsValid = false;
+}
+
+String KURLGooglePrivate::componentString(const url_parse::Component& comp) const
+{
+    if (!m_isValid || comp.len <= 0) {
+        // KURL returns a NULL string if the URL is itself a NULL string, and an
+        // empty string for other nonexistant entities.
+        if (utf8String().isNull())
+            return String();
+        return String("", 0);
+    }
+    // begin and len are in terms of bytes which do not match
+    // if string() is UTF-16 and input contains non-ASCII characters.
+    // However, the only part in urlString that can contain non-ASCII
+    // characters is 'ref' at the end of the string. In that case,
+    // begin will always match the actual value and len (in terms of
+    // byte) will be longer than what's needed by 'mid'. However, mid
+    // truncates len to avoid go past the end of a string so that we can
+    // get away withtout doing anything here.
+    return string().substring(comp.begin, comp.len);
+}
+
+void KURLGooglePrivate::replaceComponents(const Replacements& replacements)
+{
+    url_canon::RawCanonOutputT<char> output;
+    url_parse::Parsed newParsed;
+
+    m_isValid = url_util::ReplaceComponents(utf8String().data(),
+                                            utf8String().length(), m_parsed, replacements, 0, &output, &newParsed);
+
+    m_parsed = newParsed;
+    if (m_parsed.ref.is_nonempty())
+        setUtf8(CString(output.data(), output.length()));
+    else
+        setAscii(CString(output.data(), output.length()));
+}
+
+const String& KURLGooglePrivate::string() const
+{
+    if (!m_stringIsValid) {
+        // Must special case the NULL case, since constructing the
+        // string like we do below will generate an empty rather than
+        // a NULL string.
+        if (m_utf8.isNull())
+            m_string = String();
+        else if (m_utf8IsASCII)
+            m_string = String(m_utf8.data(), m_utf8.length());
+        else
+            m_string = String::fromUTF8(m_utf8.data(), m_utf8.length());
+        m_stringIsValid = true;
+    }
+    return m_string;
+}
+
+// KURL ------------------------------------------------------------------------
+
+// Creates with NULL-terminated string input representing an absolute URL.
+// WebCore generally calls this only with hardcoded strings, so the input is
+// ASCII. We treat is as UTF-8 just in case.
+KURL::KURL(const char *url)
+{
+    // FIXME The Mac code checks for beginning with a slash and converting to a
+    // file: URL. We will want to add this as well once we can compile on a
+    // system like that.
+    m_url.init(KURL(), url, strlen(url), 0);
+
+    // The one-argument constructors should never generate a NULL string.
+    // This is a funny quirk of KURL.cpp (probably a bug) which we preserve.
+    if (m_url.utf8String().isNull())
+        m_url.setAscii(CString("", 0));
+}
+
+// Initializes with a string representing an absolute URL. No encoding
+// information is specified. This generally happens when a KURL is converted
+// to a string and then converted back. In this case, the URL is already
+// canonical and in proper escaped form so needs no encoding. We treat it was
+// UTF-8 just in case.
+KURL::KURL(const String& url)
+{
+    if (!url.isNull())
+        m_url.init(KURL(), url, 0);
+    else {
+        // WebCore expects us to preserve the nullness of strings when this
+        // constructor is used. In all other cases, it expects a non-null
+        // empty string, which is what init() will create.
+        m_url.m_isValid = false;
+        m_url.m_protocolInHTTPFamily = false;
+    }
+}
+
+// Constructs a new URL given a base URL and a possibly relative input URL.
+// This assumes UTF-8 encoding.
+KURL::KURL(const KURL& base, const String& relative)
+{
+    m_url.init(base, relative, 0);
+}
+
+// Constructs a new URL given a base URL and a possibly relative input URL.
+// Any query portion of the relative URL will be encoded in the given encoding.
+KURL::KURL(const KURL& base,
+           const String& relative,
+           const TextEncoding& encoding)
+{
+    m_url.init(base, relative, &encoding.encodingForFormSubmission());
+}
+
+KURL::KURL(const CString& canonicalSpec,
+           const url_parse::Parsed& parsed, bool isValid)
+    : m_url(parsed, isValid)
+{
+    // We know the reference fragment is the only part that can be UTF-8, so
+    // we know it's ASCII when there is no ref.
+    if (parsed.ref.is_nonempty())
+        m_url.setUtf8(canonicalSpec);
+    else
+        m_url.setAscii(canonicalSpec);
+}
+
+#if PLATFORM(CF)
+KURL::KURL(CFURLRef)
+{
+    notImplemented();
+    invalidate();
+}
+
+CFURLRef KURL::createCFURL() const
+{
+    notImplemented();
+    return 0;
+}
+#endif
+
+KURL KURL::copy() const
+{
+    KURL result = *this;
+    m_url.copyTo(&result.m_url);
+    return result;
+}
+
+bool KURL::isNull() const
+{
+    return m_url.utf8String().isNull();
+}
+
+bool KURL::isEmpty() const
+{
+    return !m_url.utf8String().length();
+}
+
+bool KURL::isValid() const
+{
+    return m_url.m_isValid;
+}
+
+bool KURL::protocolInHTTPFamily() const
+{
+    return m_url.m_protocolInHTTPFamily;
+}
+
+bool KURL::hasPath() const
+{
+    // Note that http://www.google.com/" has a path, the path is "/". This can
+    // return false only for invalid or nonstandard URLs.
+    return m_url.m_parsed.path.len >= 0;
+}
+
+// We handle "parameters" separated by a semicolon, while KURL.cpp does not,
+// which can lead to different results in some cases.
+String KURL::lastPathComponent() const
+{
+    // When the output ends in a slash, WebCore has different expectations than
+    // the GoogleURL library. For "/foo/bar/" the library will return the empty
+    // string, but WebCore wants "bar".
+    url_parse::Component path = m_url.m_parsed.path;
+    if (path.len > 0 && m_url.utf8String().data()[path.end() - 1] == '/')
+        path.len--;
+
+    url_parse::Component file;
+    url_parse::ExtractFileName(m_url.utf8String().data(), path, &file);
+
+    // Bug: https://bugs.webkit.org/show_bug.cgi?id=21015 this function returns
+    // a null string when the path is empty, which we duplicate here.
+    if (!file.is_nonempty())
+        return String();
+    return m_url.componentString(file);
+}
+
+String KURL::protocol() const
+{
+    return m_url.componentString(m_url.m_parsed.scheme);
+}
+
+String KURL::host() const
+{
+    // Note: KURL.cpp unescapes here.
+    return m_url.componentString(m_url.m_parsed.host);
+}
+
+// Returns 0 when there is no port or it is invalid.
+//
+// We treat URL's with out-of-range port numbers as invalid URLs, and they will
+// be rejected by the canonicalizer. KURL.cpp will allow them in parsing, but
+// return 0 from this port() function, so we mirror that behavior here.
+unsigned short KURL::port() const
+{
+    if (!m_url.m_isValid || m_url.m_parsed.port.len <= 0)
+        return 0;
+    int port = url_parse::ParsePort(m_url.utf8String().data(), m_url.m_parsed.port);
+    if (port == url_parse::PORT_UNSPECIFIED)
+        return 0;
+    return static_cast<unsigned short>(port);
+}
+
+// Returns the empty string if there is no password.
+String KURL::pass() const
+{
+    // Bug: https://bugs.webkit.org/show_bug.cgi?id=21015 this function returns
+    // a null string when the password is empty, which we duplicate here.
+    if (!m_url.m_parsed.password.is_nonempty())
+        return String();
+
+    // Note: KURL.cpp unescapes here.
+    return m_url.componentString(m_url.m_parsed.password);
+}
+
+// Returns the empty string if there is no username.
+String KURL::user() const
+{
+    // Note: KURL.cpp unescapes here.
+    return m_url.componentString(m_url.m_parsed.username);
+}
+
+String KURL::ref() const
+{
+    // Empty but present refs ("foo.com/bar#") should result in the empty
+    // string, which m_url.componentString will produce. Nonexistant refs should be
+    // the NULL string.
+    if (!m_url.m_parsed.ref.is_valid())
+        return String();
+
+    // Note: KURL.cpp unescapes here.
+    return m_url.componentString(m_url.m_parsed.ref);
+}
+
+bool KURL::hasRef() const
+{
+    // Note: KURL.cpp unescapes here.
+    // FIXME determine if KURL.cpp agrees about an empty ref
+    return m_url.m_parsed.ref.len >= 0;
+}
+
+String KURL::query() const
+{
+    if (m_url.m_parsed.query.len >= 0)
+        return m_url.componentString(m_url.m_parsed.query);
+
+    // Bug: https://bugs.webkit.org/show_bug.cgi?id=21015 this function returns
+    // an empty string when the query is empty rather than a null (not sure
+    // which is right).
+    return String("", 0);
+}
+
+String KURL::path() const
+{
+    // Note: KURL.cpp unescapes here.
+    return m_url.componentString(m_url.m_parsed.path);
+}
+
+void KURL::setProtocol(const String& protocol)
+{
+    KURLGooglePrivate::Replacements replacements;
+    replacements.SetScheme(CharactersOrEmpty(protocol),
+                           url_parse::Component(0, protocol.length()));
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setHost(const String& host)
+{
+    KURLGooglePrivate::Replacements replacements;
+    replacements.SetHost(CharactersOrEmpty(host),
+                         url_parse::Component(0, host.length()));
+    m_url.replaceComponents(replacements);
+}
+
+// This function is used only in the JSC build.
+void KURL::setHostAndPort(const String& s)
+{
+    String newhost = s.left(s.find(":"));
+    String newport = s.substring(s.find(":") + 1);
+
+    KURLGooglePrivate::Replacements replacements;
+    // Host can't be removed, so we always set.
+    replacements.SetHost(CharactersOrEmpty(newhost),
+                         url_parse::Component(0, newhost.length()));
+
+    if (newport.isEmpty())  // Port may be removed, so we support clearing.
+        replacements.ClearPort();
+    else
+        replacements.SetPort(CharactersOrEmpty(newport), url_parse::Component(0, newport.length()));
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setPort(unsigned short i)
+{
+    KURLGooglePrivate::Replacements replacements;
+    String portStr;
+    if (i) {
+        portStr = String::number(static_cast<int>(i));
+        replacements.SetPort(
+            reinterpret_cast<const url_parse::UTF16Char*>(portStr.characters()),
+            url_parse::Component(0, portStr.length()));
+
+    } else {
+        // Clear any existing port when it is set to 0.
+        replacements.ClearPort();
+    }
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setUser(const String& user)
+{
+    // This function is commonly called to clear the username, which we
+    // normally don't have, so we optimize this case.
+    if (user.isEmpty() && !m_url.m_parsed.username.is_valid())
+        return;
+
+    // The canonicalizer will clear any usernames that are empty, so we
+    // don't have to explicitly call ClearUsername() here.
+    KURLGooglePrivate::Replacements replacements;
+    replacements.SetUsername(CharactersOrEmpty(user),
+                             url_parse::Component(0, user.length()));
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setPass(const String& pass)
+{
+    // This function is commonly called to clear the password, which we
+    // normally don't have, so we optimize this case.
+    if (pass.isEmpty() && !m_url.m_parsed.password.is_valid())
+        return;
+
+    // The canonicalizer will clear any passwords that are empty, so we
+    // don't have to explicitly call ClearUsername() here.
+    KURLGooglePrivate::Replacements replacements;
+    replacements.SetPassword(CharactersOrEmpty(pass),
+                             url_parse::Component(0, pass.length()));
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setRef(const String& ref)
+{
+    // This function is commonly called to clear the ref, which we
+    // normally don't have, so we optimize this case.
+    if (ref.isNull() && !m_url.m_parsed.ref.is_valid())
+        return;
+
+    KURLGooglePrivate::Replacements replacements;
+    if (ref.isNull())
+        replacements.ClearRef();
+    else
+        replacements.SetRef(CharactersOrEmpty(ref), url_parse::Component(0, ref.length()));
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::removeRef()
+{
+    KURLGooglePrivate::Replacements replacements;
+    replacements.ClearRef();
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setQuery(const String& query)
+{
+    KURLGooglePrivate::Replacements replacements;
+    if (query.isNull()) {
+        // KURL.cpp sets to NULL to clear any query.
+        replacements.ClearQuery();
+    } else if (query.length() > 0 && query[0] == '?') {
+        // WebCore expects the query string to begin with a question mark, but
+        // GoogleURL doesn't. So we trim off the question mark when setting.
+        replacements.SetQuery(CharactersOrEmpty(query),
+                              url_parse::Component(1, query.length() - 1));
+    } else {
+        // When set with the empty string or something that doesn't begin with
+        // a question mark, KURL.cpp will add a question mark for you. The only
+        // way this isn't compatible is if you call this function with an empty
+        // string. KURL.cpp will leave a '?' with nothing following it in the
+        // URL, whereas we'll clear it.
+        // FIXME We should eliminate this difference.
+        replacements.SetQuery(CharactersOrEmpty(query),
+                              url_parse::Component(0, query.length()));
+    }
+    m_url.replaceComponents(replacements);
+}
+
+void KURL::setPath(const String& path)
+{
+    // Empty paths will be canonicalized to "/", so we don't have to worry
+    // about calling ClearPath().
+    KURLGooglePrivate::Replacements replacements;
+    replacements.SetPath(CharactersOrEmpty(path),
+                         url_parse::Component(0, path.length()));
+    m_url.replaceComponents(replacements);
+}
+
+// On Mac, this just seems to return the same URL, but with "/foo/bar" for
+// file: URLs instead of file:///foo/bar. We don't bother with any of this,
+// at least for now.
+String KURL::prettyURL() const
+{
+    if (!m_url.m_isValid)
+        return String();
+    return m_url.string();
+}
+
+// We copied the KURL version here on Sept 12, 2008 while doing a WebKit
+// merge.
+// 
+// FIXME Somehow share this with KURL? Like we'd theoretically merge with
+// decodeURLEscapeSequences below?
+String mimeTypeFromDataURL(const String& url)
+{
+    ASSERT(protocolIs(url, "data"));
+    int index = url.find(';');
+    if (index == -1)
+        index = url.find(',');
+    if (index != -1) {
+        int len = index - 5;
+        if (len > 0)
+            return url.substring(5, len);
+        return "text/plain"; // Data URLs with no MIME type are considered text/plain.
+    }
+    return "";
+}
+
+String decodeURLEscapeSequences(const String& str)
+{
+    return decodeURLEscapeSequences(str, UTF8Encoding());
+}
+
+// In KURL.cpp's implementation, this is called by every component getter.
+// It will unescape every character, including NULL. This is scary, and may
+// cause security holes. We never call this function for components, and
+// just return the ASCII versions instead.
+//
+// However, this static function is called directly in some cases. It appears
+// that this only happens for javascript: URLs, so this is essentially the
+// JavaScript URL decoder. It assumes UTF-8 encoding.
+//
+// IE doesn't unescape %00, forcing you to use \x00 in JS strings, so we do
+// the same. This also eliminates NULL-related problems should a consumer
+// incorrectly call this function for non-JavaScript.
+//
+// FIXME These should be merged to the KURL.cpp implementation.
+String decodeURLEscapeSequences(const String& str, const TextEncoding& encoding)
+{
+    // FIXME We can probably use KURL.cpp's version of this function
+    // without modification. However, I'm concerned about
+    // https://bugs.webkit.org/show_bug.cgi?id=20559 so am keeping this old
+    // custom code for now. Using their version will also fix the bug that
+    // we ignore the encoding.
+    //
+    // FIXME b/1350291: This does not get called very often. We just convert
+    // first to 8-bit UTF-8, then unescape, then back to 16-bit. This kind of
+    // sucks, and we don't use the encoding properly, which will make some
+    // obscure anchor navigations fail.
+    CString cstr = str.utf8();
+
+    const char* input = cstr.data();
+    int inputLength = cstr.length();
+    url_canon::RawCanonOutputT<char> unescaped;
+    for (int i = 0; i < inputLength; i++) {
+        if (input[i] == '%') {
+            unsigned char ch;
+            if (url_canon::DecodeEscaped(input, &i, inputLength, &ch)) {
+                if (!ch) {
+                    // Never unescape NULLs.
+                    unescaped.push_back('%');
+                    unescaped.push_back('0');
+                    unescaped.push_back('0');
+                } else
+                    unescaped.push_back(ch);
+            } else {
+                // Invalid escape sequence, copy the percent literal.
+                unescaped.push_back('%');
+            }
+        } else {
+            // Regular non-escaped 8-bit character.
+            unescaped.push_back(input[i]);
+        }
+    }
+
+    // Convert that 8-bit to UTF-16. It's not clear IE does this at all to
+    // JavaScript URLs, but Firefox and Safari do.
+    url_canon::RawCanonOutputT<url_parse::UTF16Char> utf16;
+    for (int i = 0; i < unescaped.length(); i++) {
+        unsigned char uch = static_cast<unsigned char>(unescaped.at(i));
+        if (uch < 0x80) {
+            // Non-UTF-8, just append directly
+            utf16.push_back(uch);
+        } else {
+            // next_ch will point to the last character of the decoded
+            // character.
+            int nextCharacter = i;
+            unsigned codePoint;
+            if (url_canon::ReadUTFChar(unescaped.data(), &nextCharacter,
+                                       unescaped.length(), &codePoint)) {
+                // Valid UTF-8 character, convert to UTF-16.
+                url_canon::AppendUTF16Value(codePoint, &utf16);
+                i = nextCharacter;
+            } else {
+                // KURL.cpp strips any sequences that are not valid UTF-8. This
+                // sounds scary. Instead, we just keep those invalid code
+                // points and promote to UTF-16. We copy all characters from
+                // the current position to the end of the identified sqeuqnce.
+                while (i < nextCharacter) {
+                    utf16.push_back(static_cast<unsigned char>(unescaped.at(i)));
+                    i++;
+                }
+                utf16.push_back(static_cast<unsigned char>(unescaped.at(i)));
+            }
+        }
+    }
+
+    return String(reinterpret_cast<UChar*>(utf16.data()), utf16.length());
+}
+
+bool KURL::protocolIs(const char* protocol) const
+{
+    assertProtocolIsGood(protocol);
+    if (m_url.m_parsed.scheme.len <= 0)
+        return !protocol;
+    return lowerCaseEqualsASCII(
+        m_url.utf8String().data() + m_url.m_parsed.scheme.begin,
+        m_url.utf8String().data() + m_url.m_parsed.scheme.end(),
+        protocol);
+}
+
+bool KURL::isLocalFile() const
+{
+    return protocolIs("file");
+}
+
+// This is called to escape a URL string. It is only used externally when
+// constructing mailto: links to set the query section. Since our query setter
+// will automatically do the correct escaping, this function does not have to
+// do any work.
+//
+// There is a possibility that a future called may use this function in other
+// ways, and may expect to get a valid URL string. The dangerous thing we want
+// to protect against here is accidentally getting NULLs in a string that is
+// not supposed to have NULLs. Therefore, we escape NULLs here to prevent this.
+String encodeWithURLEscapeSequences(const String& notEncodedString)
+{
+    CString utf8 = UTF8Encoding().encode(
+        reinterpret_cast<const UChar*>(notEncodedString.characters()),
+        notEncodedString.length(),
+        URLEncodedEntitiesForUnencodables);
+    const char* input = utf8.data();
+    int inputLength = utf8.length();
+
+    Vector<char, 2048> buffer;
+    for (int i = 0; i < inputLength; i++) {
+        if (!input[i])
+            buffer.append("%00", 3);
+        else
+            buffer.append(input[i]);
+    }
+    return String(buffer.data(), buffer.size());
+}
+
+bool KURL::isHierarchical() const
+{
+    if (!m_url.m_parsed.scheme.is_nonempty())
+        return false;
+    return url_util::IsStandard(
+        &m_url.utf8String().data()[m_url.m_parsed.scheme.begin],
+        m_url.utf8String().length(),
+        m_url.m_parsed.scheme);
+}
+
+#ifndef NDEBUG
+void KURL::print() const
+{
+    printf("%s\n", m_url.utf8String().data());
+}
+#endif
+
+void KURL::invalidate()
+{
+    // This is only called from the constructor so resetting the (automatically
+    // initialized) string and parsed structure would be a waste of time.
+    m_url.m_isValid = false;
+    m_url.m_protocolInHTTPFamily = false;
+}
+
+// Equal up to reference fragments, if any.
+bool equalIgnoringRef(const KURL& a, const KURL& b)
+{
+    // Compute the length of each URL without its ref. Note that the reference
+    // begin (if it exists) points to the character *after* the '#', so we need
+    // to subtract one.
+    int aLength = a.m_url.utf8String().length();
+    if (a.m_url.m_parsed.ref.len >= 0)
+        aLength = a.m_url.m_parsed.ref.begin - 1;
+
+    int bLength = b.m_url.utf8String().length();
+    if (b.m_url.m_parsed.ref.len >= 0)
+        bLength = b.m_url.m_parsed.ref.begin - 1;
+
+    return aLength == bLength
+        && !strncmp(a.m_url.utf8String().data(), b.m_url.utf8String().data(), aLength);
+}
+
+unsigned KURL::hostStart() const
+{
+    return m_url.m_parsed.CountCharactersBefore(url_parse::Parsed::HOST, false);
+}
+
+unsigned KURL::hostEnd() const
+{
+    return m_url.m_parsed.CountCharactersBefore(url_parse::Parsed::PORT, true);
+}
+
+unsigned KURL::pathStart() const
+{
+    return m_url.m_parsed.CountCharactersBefore(url_parse::Parsed::PATH, false);
+}
+
+unsigned KURL::pathEnd() const
+{
+    return m_url.m_parsed.CountCharactersBefore(url_parse::Parsed::QUERY, true);
+}
+
+unsigned KURL::pathAfterLastSlash() const
+{
+    // When there's no path, ask for what would be the beginning of it.
+    if (!m_url.m_parsed.path.is_valid())
+        return m_url.m_parsed.CountCharactersBefore(url_parse::Parsed::PATH, false);
+
+    url_parse::Component filename;
+    url_parse::ExtractFileName(m_url.utf8String().data(), m_url.m_parsed.path,
+                               &filename);
+    return filename.begin;
+}
+
+const KURL& blankURL()
+{
+    static KURL staticBlankURL("about:blank");
+    return staticBlankURL;
+}
+
+bool protocolIs(const String& url, const char* protocol)
+{
+    // Do the comparison without making a new string object.
+    assertProtocolIsGood(protocol);
+    for (int i = 0; ; ++i) {
+        if (!protocol[i])
+            return url[i] == ':';
+        if (toASCIILower(url[i]) != protocol[i])
+            return false;
+    }
+}
+
+inline bool KURL::protocolIs(const String& string, const char* protocol)
+{
+    return WebCore::protocolIs(string, protocol);
+}
+
+} // namespace WebCore
+
+#endif // USE(GOOGLEURL)