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products/sources/formale Sprachen/C/Firefox/netwerk/base/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 108 kB

Quelle nsStandardURL.cpp Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=4 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ipc/IPCMessageUtils.h"

#include "nsASCIIMask.h"
#include "nsStandardURL.h"
#include "nsCRT.h"
#include "nsEscape.h"
#include "nsIFile.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsIIDNService.h"
#include "mozilla/Logging.h"
#include "nsIURLParser.h"
#include "nsPrintfCString.h"
#include "nsNetCID.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ipc/URIUtils.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/TextUtils.h"
#include <algorithm>
#include "nsContentUtils.h"
#include "prprf.h"
#include "nsReadableUtils.h"
#include "mozilla/net/MozURL_ffi.h"
#include "mozilla/Utf8.h"
#include "nsIClassInfoImpl.h"
#include <string.h>
#include "IPv4Parser.h"

//
// setenv MOZ_LOG nsStandardURL:5
//
static mozilla::LazyLogModule gStandardURLLog("nsStandardURL");

// The Chromium code defines its own LOG macro which we don't want
#undef LOG
#define LOG(args) MOZ_LOG(gStandardURLLog, LogLevel::Debug, args)
#undef LOG_ENABLED
#define LOG_ENABLED() MOZ_LOG_TEST(gStandardURLLog, LogLevel::Debug)

using namespace mozilla::ipc;

/**
* The UTS #46 ToUnicode operation as parametrized by the WHATWG URL Standard,
* except potentially misleading labels are treated according to ToASCII
* instead. Combined with the ToASCII operation without rerunning the expensive
* part.
*
* NOTE: This function performs percent-decoding on the argument unlike
* the other `NS_DomainTo` functions!
*
* If upon successfull return `aASCII` is empty, it is the caller's
* responsibility to treat the value of `aDisplay` also as the value of
* `aASCII`. (The weird semantics avoid useless allocation / copying.)
*
* Rust callers that don't happen to be using XPCOM strings are better
* off using the `idna` crate directly. (See `idna_glue` for what policy
* closure to use.)
*/
inline nsresult NS_DomainToDisplayAndASCII(const nsACString& aDomain,
                                           nsACString& aDisplay,
                                           nsACString& aASCII) {
  return mozilla_net_domain_to_display_and_ascii_impl(&aDomain, &aDisplay,
                                                      &aASCII);
}

namespace mozilla {
namespace net {

static NS_DEFINE_CID(kThisImplCID, NS_THIS_STANDARDURL_IMPL_CID);

// This will always be initialized and destroyed on the main thread, but
// can be safely used on other threads.
StaticRefPtr<nsIIDNService> nsStandardURL::gIDN;

Atomic<bool, Relaxed> nsStandardURL::gInitialized{false};

const char nsStandardURL::gHostLimitDigits[] = {'/', '\\', '?', '#', 0};

//----------------------------------------------------------------------------
// nsStandardURL::nsSegmentEncoder
//----------------------------------------------------------------------------

nsStandardURL::nsSegmentEncoder::nsSegmentEncoder(const Encoding* encoding)
    : mEncoding(encoding) {
  if (mEncoding == UTF_8_ENCODING) {
    mEncoding = nullptr;
  }
}

int32_t nsStandardURL::nsSegmentEncoder::EncodeSegmentCount(
    const char* aStr, const URLSegment& aSeg, int16_t aMask, nsCString& aOut,
    bool& aAppended, uint32_t aExtraLen) {
  // aExtraLen is characters outside the segment that will be
  // added when the segment is not empty (like the @ following
  // a username).
  if (!aStr || aSeg.mLen <= 0) {
    // Empty segment, so aExtraLen not added per above.
    aAppended = false;
    return 0;
  }

  uint32_t origLen = aOut.Length();

  Span<const char> span = Span(aStr + aSeg.mPos, aSeg.mLen);

  // first honor the origin charset if appropriate. as an optimization,
  // only do this if the segment is non-ASCII.  Further, if mEncoding is
  // null, then the origin charset is UTF-8 and there is nothing to do.
  if (mEncoding) {
    size_t upTo;
    if (MOZ_UNLIKELY(mEncoding == ISO_2022_JP_ENCODING)) {
      upTo = Encoding::ISO2022JPASCIIValidUpTo(AsBytes(span));
    } else {
      upTo = Encoding::ASCIIValidUpTo(AsBytes(span));
    }
    if (upTo != span.Length()) {
      // we have to encode this segment
      char bufferArr[512];
      Span<char> buffer = Span(bufferArr);

      auto encoder = mEncoding->NewEncoder();

      nsAutoCString valid;  // has to be declared in this scope
      if (MOZ_UNLIKELY(!IsUtf8(span.From(upTo)))) {
        MOZ_ASSERT_UNREACHABLE("Invalid UTF-8 passed to nsStandardURL.");
        // It's UB to pass invalid UTF-8 to
        // EncodeFromUTF8WithoutReplacement(), so let's make our input valid
        // UTF-8 by replacing invalid sequences with the REPLACEMENT
        // CHARACTER.
        UTF_8_ENCODING->Decode(
            nsDependentCSubstring(span.Elements(), span.Length()), valid);
        // This assigment is OK. `span` can't be used after `valid` has
        // been destroyed because the only way out of the scope that `valid`
        // was declared in is via return inside the loop below. Specifically,
        // the return is the only way out of the loop.
        span = valid;
      }

      size_t totalRead = 0;
      for (;;) {
        auto [encoderResult, read, written] =
            encoder->EncodeFromUTF8WithoutReplacement(
                AsBytes(span.From(totalRead)), AsWritableBytes(buffer), true);
        totalRead += read;
        auto bufferWritten = buffer.To(written);
        if (!NS_EscapeURLSpan(bufferWritten, aMask, aOut)) {
          aOut.Append(bufferWritten);
        }
        if (encoderResult == kInputEmpty) {
          aAppended = true;
          // Difference between original and current output
          // string lengths plus extra length
          return aOut.Length() - origLen + aExtraLen;
        }
        if (encoderResult == kOutputFull) {
          continue;
        }
        aOut.AppendLiteral("%26%23");
        aOut.AppendInt(encoderResult);
        aOut.AppendLiteral("%3B");
      }
      MOZ_RELEASE_ASSERT(
          false,
          "There's supposed to be no way out of the above loop except return.");
    }
  }

  if (NS_EscapeURLSpan(span, aMask, aOut)) {
    aAppended = true;
    // Difference between original and current output
    // string lengths plus extra length
    return aOut.Length() - origLen + aExtraLen;
  }
  aAppended = false;
  // Original segment length plus extra length
  return span.Length() + aExtraLen;
}

const nsACString& nsStandardURL::nsSegmentEncoder::EncodeSegment(
    const nsACString& str, int16_t mask, nsCString& result) {
  const char* text;
  bool encoded;
  EncodeSegmentCount(str.BeginReading(text), URLSegment(0, str.Length()), mask,
                     result, encoded);
  if (encoded) {
    return result;
  }
  return str;
}

//----------------------------------------------------------------------------
// nsStandardURL <public>
//----------------------------------------------------------------------------

#ifdef DEBUG_DUMP_URLS_AT_SHUTDOWN
static StaticMutex gAllURLsMutex MOZ_UNANNOTATED;
MOZ_RUNINIT static LinkedList<nsStandardURL> gAllURLs;
#endif

nsStandardURL::nsStandardURL(bool aSupportsFileURL, bool aTrackURL)
    : mURLType(URLTYPE_STANDARD),
      mSupportsFileURL(aSupportsFileURL),
      mCheckedIfHostA(false) {
  LOG(("Creating nsStandardURL @%p\n", this));

  // gInitialized changes value only once (false->true) on the main thread.
  // It's OK to race here because in the worst case we'll just
  // dispatch a noop runnable to the main thread.
  MOZ_ASSERT(gInitialized);

  // default parser in case nsIStandardURL::Init is never called
  mParser = net_GetStdURLParser();

#ifdef DEBUG_DUMP_URLS_AT_SHUTDOWN
  if (aTrackURL) {
    StaticMutexAutoLock lock(gAllURLsMutex);
    gAllURLs.insertBack(this);
  }
#endif
}

bool nsStandardURL::IsValid() {
  auto checkSegment = [&](const nsStandardURL::URLSegment& aSeg) {
#ifdef EARLY_BETA_OR_EARLIER
    // If the parity is not the same, we assume that this is caused by a memory
    // error. In this case, we think this URLSegment is valid.
    if ((aSeg.mPos.Parity() != aSeg.mPos.CalculateParity()) ||
        (aSeg.mLen.Parity() != aSeg.mLen.CalculateParity())) {
      MOZ_ASSERT(false);
      return true;
    }
#endif
    // Bad value
    if (NS_WARN_IF(aSeg.mLen < -1)) {
      return false;
    }
    if (aSeg.mLen == -1) {
      return true;
    }

    // Points out of string
    if (NS_WARN_IF(aSeg.mPos + aSeg.mLen > mSpec.Length())) {
      return false;
    }

    // Overflow
    if (NS_WARN_IF(aSeg.mPos + aSeg.mLen < aSeg.mPos)) {
      return false;
    }

    return true;
  };

  bool allSegmentsValid = checkSegment(mScheme) && checkSegment(mAuthority) &&
                          checkSegment(mUsername) && checkSegment(mPassword) &&
                          checkSegment(mHost) && checkSegment(mPath) &&
                          checkSegment(mFilepath) && checkSegment(mDirectory) &&
                          checkSegment(mBasename) && checkSegment(mExtension) &&
                          checkSegment(mQuery) && checkSegment(mRef);
  if (!allSegmentsValid) {
    return false;
  }

  if (mScheme.mPos != 0) {
    return false;
  }

  return true;
}

void nsStandardURL::SanityCheck() {
  if (!IsValid()) {
    nsPrintfCString msg(
        "mLen:%zX, mScheme (%X,%X), mAuthority (%X,%X), mUsername (%X,%X), "
        "mPassword (%X,%X), mHost (%X,%X), mPath (%X,%X), mFilepath (%X,%X), "
        "mDirectory (%X,%X), mBasename (%X,%X), mExtension (%X,%X), mQuery "
        "(%X,%X), mRef (%X,%X)",
        mSpec.Length(), (uint32_t)mScheme.mPos, (int32_t)mScheme.mLen,
        (uint32_t)mAuthority.mPos, (int32_t)mAuthority.mLen,
        (uint32_t)mUsername.mPos, (int32_t)mUsername.mLen,
        (uint32_t)mPassword.mPos, (int32_t)mPassword.mLen, (uint32_t)mHost.mPos,
        (int32_t)mHost.mLen, (uint32_t)mPath.mPos, (int32_t)mPath.mLen,
        (uint32_t)mFilepath.mPos, (int32_t)mFilepath.mLen,
        (uint32_t)mDirectory.mPos, (int32_t)mDirectory.mLen,
        (uint32_t)mBasename.mPos, (int32_t)mBasename.mLen,
        (uint32_t)mExtension.mPos, (int32_t)mExtension.mLen,
        (uint32_t)mQuery.mPos, (int32_t)mQuery.mLen, (uint32_t)mRef.mPos,
        (int32_t)mRef.mLen);
    CrashReporter::RecordAnnotationNSCString(
        CrashReporter::Annotation::URLSegments, msg);

    MOZ_CRASH("nsStandardURL::SanityCheck failed");
  }
}

nsStandardURL::~nsStandardURL() {
  LOG(("Destroying nsStandardURL @%p\n", this));

#ifdef DEBUG_DUMP_URLS_AT_SHUTDOWN
  {
    StaticMutexAutoLock lock(gAllURLsMutex);
    if (isInList()) {
      remove();
    }
  }
#endif
}

#ifdef DEBUG_DUMP_URLS_AT_SHUTDOWN
struct DumpLeakedURLs {
  DumpLeakedURLs() = default;
  ~DumpLeakedURLs();
};

DumpLeakedURLs::~DumpLeakedURLs() {
  MOZ_ASSERT(NS_IsMainThread());
  StaticMutexAutoLock lock(gAllURLsMutex);
  if (!gAllURLs.isEmpty()) {
    printf("Leaked URLs:\n");
    for (auto* url : gAllURLs) {
      url->PrintSpec();
    }
    gAllURLs.clear();
  }
}
#endif

void nsStandardURL::InitGlobalObjects() {
  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());

  if (gInitialized) {
    return;
  }

  gInitialized = true;

  nsCOMPtr<nsIIDNService> serv(do_GetService(NS_IDNSERVICE_CONTRACTID));
  if (serv) {
    gIDN = serv;
  }
  MOZ_DIAGNOSTIC_ASSERT(gIDN);

  // Make sure nsURLHelper::InitGlobals() gets called on the main thread
  nsCOMPtr<nsIURLParser> parser = net_GetStdURLParser();
  MOZ_DIAGNOSTIC_ASSERT(parser);
  Unused << parser;
}

void nsStandardURL::ShutdownGlobalObjects() {
  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
  gIDN = nullptr;

#ifdef DEBUG_DUMP_URLS_AT_SHUTDOWN
  if (gInitialized) {
    // This instanciates a dummy class, and will trigger the class
    // destructor when libxul is unloaded. This is equivalent to atexit(),
    // but gracefully handles dlclose().
    StaticMutexAutoLock lock(gAllURLsMutex);
    static DumpLeakedURLs d;
  }
#endif
}

//----------------------------------------------------------------------------
// nsStandardURL <private>
//----------------------------------------------------------------------------

void nsStandardURL::Clear() {
  mSpec.Truncate();

  mPort = -1;

  mScheme.Reset();
  mAuthority.Reset();
  mUsername.Reset();
  mPassword.Reset();
  mHost.Reset();

  mPath.Reset();
  mFilepath.Reset();
  mDirectory.Reset();
  mBasename.Reset();

  mExtension.Reset();
  mQuery.Reset();
  mRef.Reset();

  InvalidateCache();
}

void nsStandardURL::InvalidateCache(bool invalidateCachedFile) {
  if (invalidateCachedFile) {
    mFile = nullptr;
  }
}

nsIIDNService* nsStandardURL::GetIDNService() { return gIDN.get(); }

nsresult nsStandardURL::NormalizeIDN(const nsACString& aHost,
                                     nsACString& aResult) {
  mDisplayHost.Truncate();
  mCheckedIfHostA = true;
  nsCString displayHost;  // Intentionally not nsAutoCString to avoid copy when
                          // assigning to field
  nsresult rv = NS_DomainToDisplayAndASCII(aHost, displayHost, aResult);
  if (NS_FAILED(rv)) {
    return rv;
  }
  if (aResult.IsEmpty()) {
    aResult.Assign(displayHost);
  } else {
    mDisplayHost = displayHost;
  }
  return NS_OK;
}

void nsStandardURL::CoalescePath(netCoalesceFlags coalesceFlag, char* path) {
  auto resultCoalesceDirs = net_CoalesceDirs(coalesceFlag, path);
  int32_t newLen = strlen(path);
  if (newLen < mPath.mLen && resultCoalesceDirs) {
    // Obtain indices for the last slash and the end of the basename
    uint32_t lastSlash = resultCoalesceDirs->first();
    uint32_t endOfBasename = resultCoalesceDirs->second();

    int32_t diff = newLen - mPath.mLen;
    mPath.mLen = newLen;

    // The directory length includes all characters up to and
    // including the last slash
    mDirectory.mLen = static_cast<int32_t>(lastSlash) + 1;

    // basename length includes everything after the last slash
    // until hash, query, or the null char. However, if there was an extension
    // we must make sure to update the length.
    mBasename.mLen = static_cast<int32_t>(endOfBasename - mDirectory.mLen);
    if (mExtension.mLen >= 0) {
      mBasename.mLen -= 1;  // Length of the . character
      mBasename.mLen -= mExtension.mLen;
    }
    mBasename.mPos = mDirectory.mPos + mDirectory.mLen;

    // Adjust the positions of extension, query, and ref as needed
    // This is possible because net_CoalesceDirs does not modify their lengths
    ShiftFromExtension(diff);

    mFilepath.mLen += diff;
  }
}

uint32_t nsStandardURL::AppendSegmentToBuf(char* buf, uint32_t i,
                                           const char* str,
                                           const URLSegment& segInput,
                                           URLSegment& segOutput,
                                           const nsCString* escapedStr,
                                           bool useEscaped, int32_t* diff) {
  MOZ_ASSERT(segInput.mLen == segOutput.mLen);

  if (diff) {
    *diff = 0;
  }

  if (segInput.mLen > 0) {
    if (useEscaped) {
      MOZ_ASSERT(diff);
      segOutput.mLen = escapedStr->Length();
      *diff = segOutput.mLen - segInput.mLen;
      memcpy(buf + i, escapedStr->get(), segOutput.mLen);
    } else {
      memcpy(buf + i, str + segInput.mPos, segInput.mLen);
    }
    segOutput.mPos = i;
    i += segOutput.mLen;
  } else {
    segOutput.mPos = i;
  }
  return i;
}

uint32_t nsStandardURL::AppendToBuf(char* buf, uint32_t i, const char* str,
                                    uint32_t len) {
  memcpy(buf + i, str, len);
  return i + len;
}

// basic algorithm:
//  1- escape url segments (for improved GetSpec efficiency)
//  2- allocate spec buffer
//  3- write url segments
//  4- update url segment positions and lengths
nsresult nsStandardURL::BuildNormalizedSpec(const char* spec,
                                            const Encoding* encoding) {
  // Assumptions: all member URLSegments must be relative the |spec| argument
  // passed to this function.

  // buffers for holding escaped url segments (these will remain empty unless
  // escaping is required).
  nsAutoCString encUsername, encPassword, encHost, encDirectory, encBasename,
      encExtension, encQuery, encRef;
  bool useEncUsername, useEncPassword, useEncHost = false, useEncDirectory,
                                       useEncBasename, useEncExtension,
                                       useEncQuery, useEncRef;
  nsAutoCString portbuf;

  //
  // escape each URL segment, if necessary, and calculate approximate normalized
  // spec length.
  //
  // [scheme://][username[:password]@]host[:port]/path[?query_string][#ref]

  uint32_t approxLen = 0;

  // the scheme is already ASCII
  if (mScheme.mLen > 0) {
    approxLen +=
        mScheme.mLen + 3;  // includes room for "://", which we insert always
  }

  // encode URL segments; convert UTF-8 to origin charset and possibly escape.
  // results written to encXXX variables only if |spec| is not already in the
  // appropriate encoding.
  {
    nsSegmentEncoder encoder;
    nsSegmentEncoder queryEncoder(encoding);
    // Username@
    approxLen += encoder.EncodeSegmentCount(spec, mUsername, esc_Username,
                                            encUsername, useEncUsername, 0);
    approxLen += 1;  // reserve length for @
    // :password - we insert the ':' even if there's no actual password if
    // "user:@" was in the spec
    if (mPassword.mLen > 0) {
      approxLen += 1 + encoder.EncodeSegmentCount(spec, mPassword, esc_Password,
                                                  encPassword, useEncPassword);
    }
    // mHost is handled differently below due to encoding differences
    MOZ_ASSERT(mPort >= -1, "Invalid negative mPort");
    if (mPort != -1 && mPort != mDefaultPort) {
      // :port
      portbuf.AppendInt(mPort);
      approxLen += portbuf.Length() + 1;
    }

    approxLen +=
        1;  // reserve space for possible leading '/' - may not be needed
    // Should just use mPath?  These are pessimistic, and thus waste space
    approxLen += encoder.EncodeSegmentCount(spec, mDirectory, esc_Directory,
                                            encDirectory, useEncDirectory, 1);
    approxLen += encoder.EncodeSegmentCount(spec, mBasename, esc_FileBaseName,
                                            encBasename, useEncBasename);
    approxLen += encoder.EncodeSegmentCount(spec, mExtension, esc_FileExtension,
                                            encExtension, useEncExtension, 1);

    // These next ones *always* add their leading character even if length is 0
    // Handles items like "http://#"
    // ?query
    if (mQuery.mLen >= 0) {
      approxLen += 1 + queryEncoder.EncodeSegmentCount(spec, mQuery, esc_Query,
                                                       encQuery, useEncQuery);
    }
    // #ref

    if (mRef.mLen >= 0) {
      approxLen += 1 + encoder.EncodeSegmentCount(spec, mRef, esc_Ref, encRef,
                                                  useEncRef);
    }
  }

  // do not escape the hostname, if IPv6 address literal, mHost will
  // already point to a [ ] delimited IPv6 address literal.
  // However, perform Unicode normalization on it, as IDN does.
  // Note that we don't disallow URLs without a host - file:, etc
  if (mHost.mLen > 0) {
    nsDependentCSubstring tempHost(spec + mHost.mPos, mHost.mLen);
    nsresult rv;
    bool allowIp = !SegmentIs(spec, mScheme, "resource") &&
                   !SegmentIs(spec, mScheme, "chrome");
    if (tempHost.First() == '[' && allowIp) {
      mCheckedIfHostA = true;
      rv = (nsresult)rusturl_parse_ipv6addr(&tempHost, &encHost);
      if (NS_FAILED(rv)) {
        return rv;
      }
    } else {
      rv = NormalizeIDN(tempHost, encHost);
      if (NS_FAILED(rv)) {
        return rv;
      }
      if (IPv4Parser::EndsInANumber(encHost) && allowIp) {
        nsAutoCString ipString;
        rv = IPv4Parser::NormalizeIPv4(encHost, ipString);
        if (NS_FAILED(rv)) {
          return rv;
        }
        encHost = ipString;
      }
    }

    // NormalizeIDN always copies, if the call was successful.
    useEncHost = true;
    approxLen += encHost.Length();
  } else {
    // empty host means empty mDisplayHost
    mDisplayHost.Truncate();
    mCheckedIfHostA = true;
  }

  // We must take a copy of every single segment because they are pointing to
  // the |spec| while we are changing their value, in case we must use
  // encoded strings.
  URLSegment username(mUsername);
  URLSegment password(mPassword);
  URLSegment host(mHost);
  URLSegment path(mPath);
  URLSegment directory(mDirectory);
  URLSegment basename(mBasename);
  URLSegment extension(mExtension);
  URLSegment query(mQuery);
  URLSegment ref(mRef);

  // The encoded string could be longer than the original input, so we need
  // to check the final URI isn't longer than the max length.
  if (approxLen + 1 > StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  //
  // generate the normalized URL string
  //
  // approxLen should be correct or 1 high
  if (!mSpec.SetLength(approxLen + 1,
                       fallible)) {  // buf needs a trailing '\0' below
    return NS_ERROR_OUT_OF_MEMORY;
  }
  char* buf = mSpec.BeginWriting();
  uint32_t i = 0;
  int32_t diff = 0;

  if (mScheme.mLen > 0) {
    i = AppendSegmentToBuf(buf, i, spec, mScheme, mScheme);
    net_ToLowerCase(buf + mScheme.mPos, mScheme.mLen);
    i = AppendToBuf(buf, i, "://", 3);
  }

  // record authority starting position
  mAuthority.mPos = i;

  // append authority
  if (mUsername.mLen > 0 || mPassword.mLen > 0) {
    if (mUsername.mLen > 0) {
      i = AppendSegmentToBuf(buf, i, spec, username, mUsername, &encUsername,
                             useEncUsername, &diff);
      ShiftFromPassword(diff);
    } else {
      mUsername.mLen = -1;
    }
    if (password.mLen > 0) {
      buf[i++] = ':';
      i = AppendSegmentToBuf(buf, i, spec, password, mPassword, &encPassword,
                             useEncPassword, &diff);
      ShiftFromHost(diff);
    } else {
      mPassword.mLen = -1;
    }
    buf[i++] = '@';
  } else {
    mUsername.mLen = -1;
    mPassword.mLen = -1;
  }
  if (host.mLen > 0) {
    i = AppendSegmentToBuf(buf, i, spec, host, mHost, &encHost, useEncHost,
                           &diff);
    ShiftFromPath(diff);

    MOZ_ASSERT(mPort >= -1, "Invalid negative mPort");
    if (mPort != -1 && mPort != mDefaultPort) {
      buf[i++] = ':';
      // Already formatted while building approxLen
      i = AppendToBuf(buf, i, portbuf.get(), portbuf.Length());
    }
  }

  // record authority length
  mAuthority.mLen = i - mAuthority.mPos;

  // path must always start with a "/"
  if (mPath.mLen <= 0) {
    LOG(("setting path=/"));
    mDirectory.mPos = mFilepath.mPos = mPath.mPos = i;
    mDirectory.mLen = mFilepath.mLen = mPath.mLen = 1;
    // basename must exist, even if empty (bug 113508)
    mBasename.mPos = i + 1;
    mBasename.mLen = 0;
    buf[i++] = '/';
  } else {
    uint32_t leadingSlash = 0;
    if (spec[path.mPos] != '/') {
      LOG(("adding leading slash to path\n"));
      leadingSlash = 1;
      buf[i++] = '/';
      // basename must exist, even if empty (bugs 113508, 429347)
      if (mBasename.mLen == -1) {
        mBasename.mPos = basename.mPos = i;
        mBasename.mLen = basename.mLen = 0;
      }
    }

    // record corrected (file)path starting position
    mPath.mPos = mFilepath.mPos = i - leadingSlash;

    i = AppendSegmentToBuf(buf, i, spec, directory, mDirectory, &encDirectory,
                           useEncDirectory, &diff);
    ShiftFromBasename(diff);

    // the directory must end with a '/'
    if (buf[i - 1] != '/') {
      buf[i++] = '/';
      mDirectory.mLen++;
    }

    i = AppendSegmentToBuf(buf, i, spec, basename, mBasename, &encBasename,
                           useEncBasename, &diff);
    ShiftFromExtension(diff);

    // make corrections to directory segment if leadingSlash
    if (leadingSlash) {
      mDirectory.mPos = mPath.mPos;
      if (mDirectory.mLen >= 0) {
        mDirectory.mLen += leadingSlash;
      } else {
        mDirectory.mLen = 1;
      }
    }

    if (mExtension.mLen >= 0) {
      buf[i++] = '.';
      i = AppendSegmentToBuf(buf, i, spec, extension, mExtension, &encExtension,
                             useEncExtension, &diff);
      ShiftFromQuery(diff);
    }
    // calculate corrected filepath length
    mFilepath.mLen = i - mFilepath.mPos;

    if (mQuery.mLen >= 0) {
      buf[i++] = '?';
      i = AppendSegmentToBuf(buf, i, spec, query, mQuery, &encQuery,
                             useEncQuery, &diff);
      ShiftFromRef(diff);
    }
    if (mRef.mLen >= 0) {
      buf[i++] = '#';
      i = AppendSegmentToBuf(buf, i, spec, ref, mRef, &encRef, useEncRef,
                             &diff);
    }
    // calculate corrected path length
    mPath.mLen = i - mPath.mPos;
  }

  buf[i] = '\0';

  // https://url.spec.whatwg.org/#path-state (1.4.1.2)
  // https://url.spec.whatwg.org/#windows-drive-letter
  if (SegmentIs(buf, mScheme, "file")) {
    char* path = &buf[mPath.mPos];
    // To account for cases like file:///w|/m and file:///c|
    if (mPath.mLen >= 3 && path[0] == '/' && IsAsciiAlpha(path[1]) &&
        path[2] == '|' && (mPath.mLen == 3 || path[3] == '/')) {
      buf[mPath.mPos + 2] = ':';
    }
  }

  if (mDirectory.mLen > 0) {
    netCoalesceFlags coalesceFlag = NET_COALESCE_NORMAL;
    if (SegmentIs(buf, mScheme, "ftp")) {
      coalesceFlag =
          (netCoalesceFlags)(coalesceFlag | NET_COALESCE_ALLOW_RELATIVE_ROOT |
                             NET_COALESCE_DOUBLE_SLASH_IS_ROOT);
    }
    CoalescePath(coalesceFlag, buf + mDirectory.mPos);
  }
  mSpec.Truncate(strlen(buf));
  NS_ASSERTION(mSpec.Length() <= approxLen,
               "We've overflowed the mSpec buffer!");
  MOZ_ASSERT(mSpec.Length() <= StaticPrefs::network_standard_url_max_length(),
             "The spec should never be this long, we missed a check.");

  MOZ_ASSERT(mUsername.mLen != 0 && mPassword.mLen != 0);
  return NS_OK;
}

bool nsStandardURL::SegmentIs(const URLSegment& seg, const char* val,
                              bool ignoreCase) {
  // one or both may be null
  if (!val || mSpec.IsEmpty()) {
    return (!val && (mSpec.IsEmpty() || seg.mLen < 0));
  }
  if (seg.mLen < 0) {
    return false;
  }
  // if the first |seg.mLen| chars of |val| match, then |val| must
  // also be null terminated at |seg.mLen|.
  if (ignoreCase) {
    return !nsCRT::strncasecmp(mSpec.get() + seg.mPos, val, seg.mLen) &&
           (val[seg.mLen] == '\0');
  }

  return !strncmp(mSpec.get() + seg.mPos, val, seg.mLen) &&
         (val[seg.mLen] == '\0');
}

bool nsStandardURL::SegmentIs(const char* spec, const URLSegment& seg,
                              const char* val, bool ignoreCase) {
  // one or both may be null
  if (!val || !spec) {
    return (!val && (!spec || seg.mLen < 0));
  }
  if (seg.mLen < 0) {
    return false;
  }
  // if the first |seg.mLen| chars of |val| match, then |val| must
  // also be null terminated at |seg.mLen|.
  if (ignoreCase) {
    return !nsCRT::strncasecmp(spec + seg.mPos, val, seg.mLen) &&
           (val[seg.mLen] == '\0');
  }

  return !strncmp(spec + seg.mPos, val, seg.mLen) && (val[seg.mLen] == '\0');
}

bool nsStandardURL::SegmentIs(const URLSegment& seg1, const char* val,
                              const URLSegment& seg2, bool ignoreCase) {
  if (seg1.mLen != seg2.mLen) {
    return false;
  }
  if (seg1.mLen == -1 || (!val && mSpec.IsEmpty())) {
    return true;  // both are empty
  }
  if (!val) {
    return false;
  }
  if (ignoreCase) {
    return !nsCRT::strncasecmp(mSpec.get() + seg1.mPos, val + seg2.mPos,
                               seg1.mLen);
  }

  return !strncmp(mSpec.get() + seg1.mPos, val + seg2.mPos, seg1.mLen);
}

int32_t nsStandardURL::ReplaceSegment(uint32_t pos, uint32_t len,
                                      const char* val, uint32_t valLen) {
  if (val && valLen) {
    if (len == 0) {
      mSpec.Insert(val, pos, valLen);
    } else {
      mSpec.Replace(pos, len, nsDependentCString(val, valLen));
    }
    return valLen - len;
  }

  // else remove the specified segment
  mSpec.Cut(pos, len);
  return -int32_t(len);
}

int32_t nsStandardURL::ReplaceSegment(uint32_t pos, uint32_t len,
                                      const nsACString& val) {
  if (len == 0) {
    mSpec.Insert(val, pos);
  } else {
    mSpec.Replace(pos, len, val);
  }
  return val.Length() - len;
}

nsresult nsStandardURL::ParseURL(const char* spec, int32_t specLen) {
  nsresult rv;

  if (specLen > (int32_t)StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  //
  // parse given URL string
  //
  uint32_t schemePos = mScheme.mPos;
  int32_t schemeLen = mScheme.mLen;
  uint32_t authorityPos = mAuthority.mPos;
  int32_t authorityLen = mAuthority.mLen;
  uint32_t pathPos = mPath.mPos;
  int32_t pathLen = mPath.mLen;
  rv = mParser->ParseURL(spec, specLen, &schemePos, &schemeLen, &authorityPos,
                         &authorityLen, &pathPos, &pathLen);
  if (NS_FAILED(rv)) {
    return rv;
  }
  mScheme.mPos = schemePos;
  mScheme.mLen = schemeLen;
  mAuthority.mPos = authorityPos;
  mAuthority.mLen = authorityLen;
  mPath.mPos = pathPos;
  mPath.mLen = pathLen;

#ifdef DEBUG
  if (mScheme.mLen <= 0) {
    printf("spec=%s\n", spec);
    NS_WARNING("malformed url: no scheme");
  }
#endif

  if (mAuthority.mLen > 0) {
    uint32_t usernamePos = mUsername.mPos;
    int32_t usernameLen = mUsername.mLen;
    uint32_t passwordPos = mPassword.mPos;
    int32_t passwordLen = mPassword.mLen;
    uint32_t hostPos = mHost.mPos;
    int32_t hostLen = mHost.mLen;
    rv = mParser->ParseAuthority(spec + mAuthority.mPos, mAuthority.mLen,
                                 &usernamePos, &usernameLen, &passwordPos,
                                 &passwordLen, &hostPos, &hostLen, &mPort);
    if (NS_FAILED(rv)) {
      return rv;
    }

    mUsername.mPos = usernamePos;
    mUsername.mLen = usernameLen;
    mPassword.mPos = passwordPos;
    mPassword.mLen = passwordLen;
    mHost.mPos = hostPos;
    mHost.mLen = hostLen;

    // Don't allow mPort to be set to this URI's default port
    if (mPort == mDefaultPort) {
      mPort = -1;
    }

    mUsername.mPos += mAuthority.mPos;
    mPassword.mPos += mAuthority.mPos;
    mHost.mPos += mAuthority.mPos;
  }

  if (mPath.mLen > 0) {
    rv = ParsePath(spec, mPath.mPos, mPath.mLen);
  }

  return rv;
}

nsresult nsStandardURL::ParsePath(const char* spec, uint32_t pathPos,
                                  int32_t pathLen) {
  LOG(("ParsePath: %s pathpos %d len %d\n", spec, pathPos, pathLen));

  if (pathLen > (int32_t)StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  uint32_t filePathPos = mFilepath.mPos;
  int32_t filePathLen = mFilepath.mLen;
  uint32_t queryPos = mQuery.mPos;
  int32_t queryLen = mQuery.mLen;
  uint32_t refPos = mRef.mPos;
  int32_t refLen = mRef.mLen;
  nsresult rv =
      mParser->ParsePath(spec + pathPos, pathLen, &filePathPos, &filePathLen,
                         &queryPos, &queryLen, &refPos, &refLen);
  if (NS_FAILED(rv)) {
    return rv;
  }

  mFilepath.mPos = filePathPos;
  mFilepath.mLen = filePathLen;
  mQuery.mPos = queryPos;
  mQuery.mLen = queryLen;
  mRef.mPos = refPos;
  mRef.mLen = refLen;

  mFilepath.mPos += pathPos;
  mQuery.mPos += pathPos;
  mRef.mPos += pathPos;

  if (mFilepath.mLen > 0) {
    uint32_t directoryPos = mDirectory.mPos;
    int32_t directoryLen = mDirectory.mLen;
    uint32_t basenamePos = mBasename.mPos;
    int32_t basenameLen = mBasename.mLen;
    uint32_t extensionPos = mExtension.mPos;
    int32_t extensionLen = mExtension.mLen;
    rv = mParser->ParseFilePath(spec + mFilepath.mPos, mFilepath.mLen,
                                &directoryPos, &directoryLen, &basenamePos,
                                &basenameLen, &extensionPos, &extensionLen);
    if (NS_FAILED(rv)) {
      return rv;
    }

    mDirectory.mPos = directoryPos;
    mDirectory.mLen = directoryLen;
    mBasename.mPos = basenamePos;
    mBasename.mLen = basenameLen;
    mExtension.mPos = extensionPos;
    mExtension.mLen = extensionLen;

    mDirectory.mPos += mFilepath.mPos;
    mBasename.mPos += mFilepath.mPos;
    mExtension.mPos += mFilepath.mPos;
  }
  return NS_OK;
}

char* nsStandardURL::AppendToSubstring(uint32_t pos, int32_t len,
                                       const char* tail) {
  // Verify pos and length are within boundaries
  if (pos > mSpec.Length()) {
    return nullptr;
  }
  if (len < 0) {
    return nullptr;
  }
  if ((uint32_t)len > (mSpec.Length() - pos)) {
    return nullptr;
  }
  if (!tail) {
    return nullptr;
  }

  uint32_t tailLen = strlen(tail);

  // Check for int overflow for proposed length of combined string
  if (UINT32_MAX - ((uint32_t)len + 1) < tailLen) {
    return nullptr;
  }

  char* result = (char*)moz_xmalloc(len + tailLen + 1);
  memcpy(result, mSpec.get() + pos, len);
  memcpy(result + len, tail, tailLen);
  result[len + tailLen] = '\0';
  return result;
}

nsresult nsStandardURL::ReadSegment(nsIBinaryInputStream* stream,
                                    URLSegment& seg) {
  nsresult rv;

  uint32_t pos = seg.mPos;
  rv = stream->Read32(&pos);
  if (NS_FAILED(rv)) {
    return rv;
  }

  seg.mPos = pos;

  uint32_t len = seg.mLen;
  rv = stream->Read32(&len);
  if (NS_FAILED(rv)) {
    return rv;
  }

  CheckedInt<int32_t> checkedLen(len);
  if (!checkedLen.isValid()) {
    seg.mLen = -1;
  } else {
    seg.mLen = len;
  }

  return NS_OK;
}

nsresult nsStandardURL::WriteSegment(nsIBinaryOutputStream* stream,
                                     const URLSegment& seg) {
  nsresult rv;

  rv = stream->Write32(seg.mPos);
  if (NS_FAILED(rv)) {
    return rv;
  }

  rv = stream->Write32(uint32_t(seg.mLen));
  if (NS_FAILED(rv)) {
    return rv;
  }

  return NS_OK;
}

#define SHIFT_FROM(name, what)                         \
  void nsStandardURL::name(int32_t diff) {             \
    if (!diff) return;                                 \
    if ((what).mLen >= 0) {                            \
      CheckedInt<int32_t> pos = (uint32_t)(what).mPos; \
      pos += diff;                                     \
      MOZ_ASSERT(pos.isValid());                       \
      (what).mPos = pos.value();                       \
    } else {                                           \
      MOZ_RELEASE_ASSERT((what).mLen == -1);           \
    }

#define SHIFT_FROM_NEXT(name, what, next) \
  SHIFT_FROM(name, what)                  \
  next(diff);                             \
  }

#define SHIFT_FROM_LAST(name, what) \
  SHIFT_FROM(name, what)            \
  }

SHIFT_FROM_NEXT(ShiftFromAuthority, mAuthority, ShiftFromUsername)
SHIFT_FROM_NEXT(ShiftFromUsername, mUsername, ShiftFromPassword)
SHIFT_FROM_NEXT(ShiftFromPassword, mPassword, ShiftFromHost)
SHIFT_FROM_NEXT(ShiftFromHost, mHost, ShiftFromPath)
SHIFT_FROM_NEXT(ShiftFromPath, mPath, ShiftFromFilepath)
SHIFT_FROM_NEXT(ShiftFromFilepath, mFilepath, ShiftFromDirectory)
SHIFT_FROM_NEXT(ShiftFromDirectory, mDirectory, ShiftFromBasename)
SHIFT_FROM_NEXT(ShiftFromBasename, mBasename, ShiftFromExtension)
SHIFT_FROM_NEXT(ShiftFromExtension, mExtension, ShiftFromQuery)
SHIFT_FROM_NEXT(ShiftFromQuery, mQuery, ShiftFromRef)
SHIFT_FROM_LAST(ShiftFromRef, mRef)

//----------------------------------------------------------------------------
// nsStandardURL::nsIClassInfo
//----------------------------------------------------------------------------

NS_IMPL_CLASSINFO(nsStandardURL, nullptr, nsIClassInfo::THREADSAFE,
                  NS_STANDARDURL_CID)
// Empty CI getter. We only need nsIClassInfo for Serialization
NS_IMPL_CI_INTERFACE_GETTER0(nsStandardURL)

//----------------------------------------------------------------------------
// nsStandardURL::nsISupports
//----------------------------------------------------------------------------

NS_IMPL_ADDREF(nsStandardURL)
NS_IMPL_RELEASE(nsStandardURL)

NS_INTERFACE_MAP_BEGIN(nsStandardURL)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStandardURL)
  NS_INTERFACE_MAP_ENTRY(nsIURI)
  NS_INTERFACE_MAP_ENTRY(nsIURL)
  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIFileURL, mSupportsFileURL)
  NS_INTERFACE_MAP_ENTRY(nsIStandardURL)
  NS_INTERFACE_MAP_ENTRY(nsISerializable)
  NS_IMPL_QUERY_CLASSINFO(nsStandardURL)
  NS_INTERFACE_MAP_ENTRY(nsISensitiveInfoHiddenURI)
  // see nsStandardURL::Equals
  if (aIID.Equals(kThisImplCID)) {
    foundInterface = static_cast<nsIURI*>(this);
  } else
    NS_INTERFACE_MAP_ENTRY(nsISizeOf)
NS_INTERFACE_MAP_END

//----------------------------------------------------------------------------
// nsStandardURL::nsIURI
//----------------------------------------------------------------------------

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetSpec(nsACString& result) {
  MOZ_ASSERT(mSpec.Length() <= StaticPrefs::network_standard_url_max_length(),
             "The spec should never be this long, we missed a check.");
  result = mSpec;
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetSensitiveInfoHiddenSpec(nsACString& result) {
  nsresult rv = GetSpec(result);
  if (NS_FAILED(rv)) {
    return rv;
  }
  if (mPassword.mLen > 0) {
    result.ReplaceLiteral(mPassword.mPos, mPassword.mLen, "****");
  }
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetSpecIgnoringRef(nsACString& result) {
  // URI without ref is 0 to one char before ref
  if (mRef.mLen < 0) {
    return GetSpec(result);
  }

  URLSegment noRef(0, mRef.mPos - 1);
  result = Segment(noRef);
  MOZ_ASSERT(mCheckedIfHostA);
  return NS_OK;
}

nsresult nsStandardURL::CheckIfHostIsAscii() {
  nsresult rv;
  if (mCheckedIfHostA) {
    return NS_OK;
  }

  mCheckedIfHostA = true;

  nsAutoCString displayHost;
  // IPC deseriazation can have IPv6 without square brackets here.
  rv = NS_DomainToDisplayAllowAnyGlyphfulASCII(Host(), displayHost);
  if (NS_FAILED(rv)) {
    mDisplayHost.Truncate();
    mCheckedIfHostA = false;
    return rv;
  }

  if (!mozilla::IsAscii(displayHost)) {
    mDisplayHost = displayHost;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsStandardURL::GetDisplaySpec(nsACString& aUnicodeSpec) {
  aUnicodeSpec.Assign(mSpec);
  MOZ_ASSERT(mCheckedIfHostA);
  if (!mDisplayHost.IsEmpty()) {
    aUnicodeSpec.Replace(mHost.mPos, mHost.mLen, mDisplayHost);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsStandardURL::GetDisplayHostPort(nsACString& aUnicodeHostPort) {
  nsAutoCString unicodeHostPort;

  nsresult rv = GetDisplayHost(unicodeHostPort);
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (StringBeginsWith(Hostport(), "["_ns)) {
    aUnicodeHostPort.AssignLiteral("[");
    aUnicodeHostPort.Append(unicodeHostPort);
    aUnicodeHostPort.AppendLiteral("]");
  } else {
    aUnicodeHostPort.Assign(unicodeHostPort);
  }

  uint32_t pos = mHost.mPos + mHost.mLen;
  if (pos < mPath.mPos) {
    aUnicodeHostPort += Substring(mSpec, pos, mPath.mPos - pos);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsStandardURL::GetDisplayHost(nsACString& aUnicodeHost) {
  MOZ_ASSERT(mCheckedIfHostA);
  if (mDisplayHost.IsEmpty()) {
    return GetAsciiHost(aUnicodeHost);
  }

  aUnicodeHost = mDisplayHost;
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetPrePath(nsACString& result) {
  result = Prepath();
  MOZ_ASSERT(mCheckedIfHostA);
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetDisplayPrePath(nsACString& result) {
  result = Prepath();
  MOZ_ASSERT(mCheckedIfHostA);
  if (!mDisplayHost.IsEmpty()) {
    result.Replace(mHost.mPos, mHost.mLen, mDisplayHost);
  }
  return NS_OK;
}

// result is strictly US-ASCII
NS_IMETHODIMP
nsStandardURL::GetScheme(nsACString& result) {
  result = Scheme();
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetUserPass(nsACString& result) {
  result = Userpass();
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetUsername(nsACString& result) {
  result = Username();
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetPassword(nsACString& result) {
  result = Password();
  return NS_OK;
}

NS_IMETHODIMP
nsStandardURL::GetHostPort(nsACString& result) {
  return GetAsciiHostPort(result);
}

NS_IMETHODIMP
nsStandardURL::GetHost(nsACString& result) { return GetAsciiHost(result); }

NS_IMETHODIMP
nsStandardURL::GetPort(int32_t* result) {
  // should never be more than 16 bit
  MOZ_ASSERT(mPort <= std::numeric_limits<uint16_t>::max());
  *result = mPort;
  return NS_OK;
}

// result may contain unescaped UTF-8 characters
NS_IMETHODIMP
nsStandardURL::GetPathQueryRef(nsACString& result) {
  result = Path();
  return NS_OK;
}

// result is ASCII
NS_IMETHODIMP
nsStandardURL::GetAsciiSpec(nsACString& result) {
  result = mSpec;
  return NS_OK;
}

// result is ASCII
NS_IMETHODIMP
nsStandardURL::GetAsciiHostPort(nsACString& result) {
  result = Hostport();
  return NS_OK;
}

// result is ASCII
NS_IMETHODIMP
nsStandardURL::GetAsciiHost(nsACString& result) {
  result = Host();
  return NS_OK;
}

static bool IsSpecialProtocol(const nsACString& input) {
  nsACString::const_iterator start, end;
  input.BeginReading(start);
  nsACString::const_iterator iterator(start);
  input.EndReading(end);

  while (iterator != end && *iterator != ':') {
    iterator++;
  }

  nsAutoCString protocol(nsDependentCSubstring(start.get(), iterator.get()));

  return protocol.LowerCaseEqualsLiteral("http") ||
         protocol.LowerCaseEqualsLiteral("https") ||
         protocol.LowerCaseEqualsLiteral("ftp") ||
         protocol.LowerCaseEqualsLiteral("ws") ||
         protocol.LowerCaseEqualsLiteral("wss") ||
         protocol.LowerCaseEqualsLiteral("file") ||
         protocol.LowerCaseEqualsLiteral("gopher");
}

nsresult nsStandardURL::SetSpecInternal(const nsACString& input) {
  return SetSpecWithEncoding(input, nullptr);
}

nsresult nsStandardURL::SetSpecWithEncoding(const nsACString& input,
                                            const Encoding* encoding) {
  const nsPromiseFlatCString& flat = PromiseFlatCString(input);
  LOG(("nsStandardURL::SetSpec [spec=%s]\n", flat.get()));

  if (input.Length() > StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  // filter out unexpected chars "\r\n\t" if necessary
  nsAutoCString filteredURI;
  net_FilterURIString(flat, filteredURI);

  if (filteredURI.Length() == 0) {
    return NS_ERROR_MALFORMED_URI;
  }

  // Make a backup of the current URL
  nsStandardURL prevURL(false, false);
  prevURL.CopyMembers(this, eHonorRef, ""_ns);
  Clear();

  if (IsSpecialProtocol(filteredURI)) {
    // Bug 652186: Replace all backslashes with slashes when parsing paths
    // Stop when we reach the query or the hash.
    auto* start = filteredURI.BeginWriting();
    auto* end = filteredURI.EndWriting();
    while (start != end) {
      if (*start == '?' || *start == '#') {
        break;
      }
      if (*start == '\\') {
        *start = '/';
      }
      start++;
    }
  }

  const char* spec = filteredURI.get();
  int32_t specLength = filteredURI.Length();

  // parse the given URL...
  nsresult rv = ParseURL(spec, specLength);
  if (mScheme.mLen <= 0) {
    rv = NS_ERROR_MALFORMED_URI;
  }
  if (NS_SUCCEEDED(rv)) {
    // finally, use the URLSegment member variables to build a normalized
    // copy of |spec|
    rv = BuildNormalizedSpec(spec, encoding);
  }

  // Make sure that a URLTYPE_AUTHORITY has a non-empty hostname.
  if (mURLType == URLTYPE_AUTHORITY && mHost.mLen <= 0) {
    rv = NS_ERROR_MALFORMED_URI;
  }

  if (NS_FAILED(rv)) {
    Clear();
    // If parsing the spec has failed, restore the old URL
    // so we don't end up with an empty URL.
    CopyMembers(&prevURL, eHonorRef, ""_ns);
    return rv;
  }

  if (LOG_ENABLED()) {
    LOG((" spec = %s\n", mSpec.get()));
    LOG((" port = %d\n", mPort));
    LOG((" scheme = (%u,%d)\n", (uint32_t)mScheme.mPos,
         (int32_t)mScheme.mLen));
    LOG((" authority = (%u,%d)\n", (uint32_t)mAuthority.mPos,
         (int32_t)mAuthority.mLen));
    LOG((" username = (%u,%d)\n", (uint32_t)mUsername.mPos,
         (int32_t)mUsername.mLen));
    LOG((" password = (%u,%d)\n", (uint32_t)mPassword.mPos,
         (int32_t)mPassword.mLen));
    LOG((" hostname = (%u,%d)\n", (uint32_t)mHost.mPos, (int32_t)mHost.mLen));
    LOG((" path = (%u,%d)\n", (uint32_t)mPath.mPos, (int32_t)mPath.mLen));
    LOG((" filepath = (%u,%d)\n", (uint32_t)mFilepath.mPos,
         (int32_t)mFilepath.mLen));
    LOG((" directory = (%u,%d)\n", (uint32_t)mDirectory.mPos,
         (int32_t)mDirectory.mLen));
    LOG((" basename = (%u,%d)\n", (uint32_t)mBasename.mPos,
         (int32_t)mBasename.mLen));
    LOG((" extension = (%u,%d)\n", (uint32_t)mExtension.mPos,
         (int32_t)mExtension.mLen));
    LOG((" query = (%u,%d)\n", (uint32_t)mQuery.mPos,
         (int32_t)mQuery.mLen));
    LOG((" ref = (%u,%d)\n", (uint32_t)mRef.mPos, (int32_t)mRef.mLen));
  }

  SanityCheck();
  return rv;
}

nsresult nsStandardURL::SetScheme(const nsACString& input) {
  // Strip tabs, newlines, carriage returns from input
  nsAutoCString scheme(input);
  scheme.StripTaggedASCII(ASCIIMask::MaskCRLFTab());

  LOG(("nsStandardURL::SetScheme [scheme=%s]\n", scheme.get()));

  if (scheme.IsEmpty()) {
    NS_WARNING("cannot remove the scheme from an url");
    return NS_ERROR_UNEXPECTED;
  }
  if (mScheme.mLen < 0) {
    NS_WARNING("uninitialized");
    return NS_ERROR_NOT_INITIALIZED;
  }

  if (!net_IsValidScheme(scheme)) {
    NS_WARNING("the given url scheme contains invalid characters");
    return NS_ERROR_UNEXPECTED;
  }

  if (mSpec.Length() + input.Length() - Scheme().Length() >
      StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  InvalidateCache();

  int32_t shift = ReplaceSegment(mScheme.mPos, mScheme.mLen, scheme);

  if (shift) {
    mScheme.mLen = scheme.Length();
    ShiftFromAuthority(shift);
  }

  // ensure new scheme is lowercase
  //
  // XXX the string code unfortunately doesn't provide a ToLowerCase
  //     that operates on a substring.
  net_ToLowerCase((char*)mSpec.get(), mScheme.mLen);

  // If the scheme changes the default port also changes.
  if (Scheme() == "http"_ns || Scheme() == "ws"_ns) {
    mDefaultPort = 80;
  } else if (Scheme() == "https"_ns || Scheme() == "wss"_ns) {
    mDefaultPort = 443;
  }
  if (mPort == mDefaultPort) {
    MOZ_ALWAYS_SUCCEEDS(SetPort(-1));
  }

  return NS_OK;
}

nsresult nsStandardURL::SetUserPass(const nsACString& input) {
  const nsPromiseFlatCString& userpass = PromiseFlatCString(input);

  LOG(("nsStandardURL::SetUserPass [userpass=%s]\n", userpass.get()));

  if (mURLType == URLTYPE_NO_AUTHORITY) {
    if (userpass.IsEmpty()) {
      return NS_OK;
    }
    NS_WARNING("cannot set user:pass on no-auth url");
    return NS_ERROR_UNEXPECTED;
  }
  if (mAuthority.mLen < 0) {
    NS_WARNING("uninitialized");
    return NS_ERROR_NOT_INITIALIZED;
  }
  if (mAuthority.mLen == 0) {
    // If the URL doesn't have a hostname then setting the userpass to
    // empty string is a no-op. But setting it to anything else should
    // return an error.
    if (input.Length() == 0) {
      return NS_OK;
    } else {
      return NS_ERROR_UNEXPECTED;
    }
  }

  if (mSpec.Length() + input.Length() - Userpass(true).Length() >
      StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });
  InvalidateCache();

  NS_ASSERTION(mHost.mLen >= 0, "uninitialized");

  nsresult rv;
  uint32_t usernamePos, passwordPos;
  int32_t usernameLen, passwordLen;

  rv = mParser->ParseUserInfo(userpass.get(), userpass.Length(), &usernamePos,
                              &usernameLen, &passwordPos, &passwordLen);
  if (NS_FAILED(rv)) {
    return rv;
  }

  // build new user:pass in |buf|
  nsAutoCString buf;
  if (usernameLen > 0 || passwordLen > 0) {
    nsSegmentEncoder encoder;
    bool ignoredOut;
    usernameLen = encoder.EncodeSegmentCount(
        userpass.get(), URLSegment(usernamePos, usernameLen),
        esc_Username | esc_AlwaysCopy, buf, ignoredOut);
    if (passwordLen > 0) {
      buf.Append(':');
      passwordLen = encoder.EncodeSegmentCount(
          userpass.get(), URLSegment(passwordPos, passwordLen),
          esc_Password | esc_AlwaysCopy, buf, ignoredOut);
    } else {
      passwordLen = -1;
    }
    if (mUsername.mLen < 0 && mPassword.mLen < 0) {
      buf.Append('@');
    }
  }

  int32_t shift = 0;

  if (mUsername.mLen < 0 && mPassword.mLen < 0) {
    // no existing user:pass
    if (!buf.IsEmpty()) {
      mSpec.Insert(buf, mHost.mPos);
      mUsername.mPos = mHost.mPos;
      shift = buf.Length();
    }
  } else {
    // replace existing user:pass
    uint32_t userpassLen = 0;
    if (mUsername.mLen > 0) {
      userpassLen += mUsername.mLen;
    }
    if (mPassword.mLen > 0) {
      userpassLen += (mPassword.mLen + 1);
    }
    if (buf.IsEmpty()) {
      // remove `@` character too
      userpassLen++;
    }
    mSpec.Replace(mAuthority.mPos, userpassLen, buf);
    shift = buf.Length() - userpassLen;
  }
  if (shift) {
    ShiftFromHost(shift);
    MOZ_DIAGNOSTIC_ASSERT(mAuthority.mLen >= -shift);
    mAuthority.mLen += shift;
  }
  // update positions and lengths
  mUsername.mLen = usernameLen > 0 ? usernameLen : -1;
  mUsername.mPos = mAuthority.mPos;
  mPassword.mLen = passwordLen > 0 ? passwordLen : -1;
  if (passwordLen > 0) {
    if (mUsername.mLen > 0) {
      mPassword.mPos = mUsername.mPos + mUsername.mLen + 1;
    } else {
      mPassword.mPos = mAuthority.mPos + 1;
    }
  }

  MOZ_ASSERT(mUsername.mLen != 0 && mPassword.mLen != 0);
  return NS_OK;
}

nsresult nsStandardURL::SetUsername(const nsACString& input) {
  const nsPromiseFlatCString& username = PromiseFlatCString(input);

  LOG(("nsStandardURL::SetUsername [username=%s]\n", username.get()));

  if (mURLType == URLTYPE_NO_AUTHORITY) {
    if (username.IsEmpty()) {
      return NS_OK;
    }
    NS_WARNING("cannot set username on no-auth url");
    return NS_ERROR_UNEXPECTED;
  }
  if (mAuthority.mLen == 0) {
    // If the URL doesn't have a hostname then setting the username to
    // empty string is a no-op. But setting it to anything else should
    // return an error.
    if (input.Length() == 0) {
      return NS_OK;
    } else {
      return NS_ERROR_UNEXPECTED;
    }
  }

  if (mSpec.Length() + input.Length() - Username().Length() >
      StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  InvalidateCache();

  // escape username if necessary
  nsAutoCString buf;
  nsSegmentEncoder encoder;
  const nsACString& escUsername =
      encoder.EncodeSegment(username, esc_Username, buf);

  int32_t shift = 0;

  if (mUsername.mLen < 0 && escUsername.IsEmpty()) {
    return NS_OK;
  }

  if (mUsername.mLen < 0 && mPassword.mLen < 0) {
    MOZ_ASSERT(!escUsername.IsEmpty(), "Should not be empty at this point");
    mUsername.mPos = mAuthority.mPos;
    mSpec.Insert(escUsername + "@"_ns, mUsername.mPos);
    shift = escUsername.Length() + 1;
    mUsername.mLen = escUsername.Length() > 0 ? escUsername.Length() : -1;
  } else {
    uint32_t pos = mUsername.mLen < 0 ? mAuthority.mPos : mUsername.mPos;
    int32_t len = mUsername.mLen < 0 ? 0 : mUsername.mLen;

    if (mPassword.mLen < 0 && escUsername.IsEmpty()) {
      len++;  // remove the @ character too
    }
    shift = ReplaceSegment(pos, len, escUsername);
    mUsername.mLen = escUsername.Length() > 0 ? escUsername.Length() : -1;
    mUsername.mPos = pos;
  }

  if (shift) {
    mAuthority.mLen += shift;
    ShiftFromPassword(shift);
  }

  MOZ_ASSERT(mUsername.mLen != 0 && mPassword.mLen != 0);
  return NS_OK;
}

nsresult nsStandardURL::SetPassword(const nsACString& input) {
  const nsPromiseFlatCString& password = PromiseFlatCString(input);

  auto clearedPassword = MakeScopeExit([&password, this]() {
    // Check that if this method is called with the empty string then the
    // password is definitely cleared when exiting this method.
    if (password.IsEmpty()) {
      MOZ_DIAGNOSTIC_ASSERT(this->Password().IsEmpty());
    }
    Unused << this;  // silence compiler -Wunused-lambda-capture
  });

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  LOG(("nsStandardURL::SetPassword [password=%s]\n", password.get()));

  if (mURLType == URLTYPE_NO_AUTHORITY) {
    if (password.IsEmpty()) {
      return NS_OK;
    }
    NS_WARNING("cannot set password on no-auth url");
    return NS_ERROR_UNEXPECTED;
  }
  if (mAuthority.mLen == 0) {
    // If the URL doesn't have a hostname then setting the password to
    // empty string is a no-op. But setting it to anything else should
    // return an error.
    if (input.Length() == 0) {
      return NS_OK;
    } else {
      return NS_ERROR_UNEXPECTED;
    }
  }

  if (mSpec.Length() + input.Length() - Password().Length() >
      StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  InvalidateCache();

  if (password.IsEmpty()) {
    if (mPassword.mLen > 0) {
      // cut(":password")
      int32_t len = mPassword.mLen;
      if (mUsername.mLen < 0) {
        len++;  // also cut the @ character
      }
      len++;  // for the : character
      mSpec.Cut(mPassword.mPos - 1, len);
      ShiftFromHost(-len);
      mAuthority.mLen -= len;
      mPassword.mLen = -1;
    }
    MOZ_ASSERT(mUsername.mLen != 0 && mPassword.mLen != 0);
    return NS_OK;
  }

  // escape password if necessary
  nsAutoCString buf;
  nsSegmentEncoder encoder;
  const nsACString& escPassword =
      encoder.EncodeSegment(password, esc_Password, buf);

  int32_t shift;

  if (mPassword.mLen < 0) {
    if (mUsername.mLen > 0) {
      mPassword.mPos = mUsername.mPos + mUsername.mLen + 1;
      mSpec.Insert(":"_ns + escPassword, mPassword.mPos - 1);
      shift = escPassword.Length() + 1;
    } else {
      mPassword.mPos = mAuthority.mPos + 1;
      mSpec.Insert(":"_ns + escPassword + "@"_ns, mPassword.mPos - 1);
      shift = escPassword.Length() + 2;
    }
  } else {
    shift = ReplaceSegment(mPassword.mPos, mPassword.mLen, escPassword);
  }

  if (shift) {
    mPassword.mLen = escPassword.Length();
    mAuthority.mLen += shift;
    ShiftFromHost(shift);
  }

  MOZ_ASSERT(mUsername.mLen != 0 && mPassword.mLen != 0);
  return NS_OK;
}

void nsStandardURL::FindHostLimit(nsACString::const_iterator& aStart,
                                  nsACString::const_iterator& aEnd) {
  for (int32_t i = 0; gHostLimitDigits[i]; ++i) {
    nsACString::const_iterator c(aStart);
    if (FindCharInReadable(gHostLimitDigits[i], c, aEnd)) {
      aEnd = c;
    }
  }
}

// If aValue only has a host part and no port number, the port
// will not be reset!!!
nsresult nsStandardURL::SetHostPort(const nsACString& aValue) {
  // We cannot simply call nsIURI::SetHost because that would treat the name as
  // an IPv6 address (like http:://[server:443]/).  We also cannot call
  // nsIURI::SetHostPort because that isn't implemented.  Sadfaces.

  nsACString::const_iterator start, end;
  aValue.BeginReading(start);
  aValue.EndReading(end);
  nsACString::const_iterator iter(start);
  bool isIPv6 = false;

  FindHostLimit(start, end);

  if (*start == '[') {  // IPv6 address
    if (!FindCharInReadable(']', iter, end)) {
      // the ] character is missing
      return NS_ERROR_MALFORMED_URI;
    }
    // iter now at the ']' character
    isIPv6 = true;
  } else {
    nsACString::const_iterator iter2(start);
    if (FindCharInReadable(']', iter2, end)) {
      // if the first char isn't [ then there should be no ] character
      return NS_ERROR_MALFORMED_URI;
    }
  }

  FindCharInReadable(':', iter, end);

  if (!isIPv6 && iter != end) {
    nsACString::const_iterator iter2(iter);
    iter2++;  // Skip over the first ':' character
    if (FindCharInReadable(':', iter2, end)) {
      // If there is more than one ':' character it suggests an IPv6
      // The format should be [2001::1]:80 where the port is optional
      return NS_ERROR_MALFORMED_URI;
    }
  }

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  nsresult rv = SetHost(Substring(start, iter));
  NS_ENSURE_SUCCESS(rv, rv);

  if (iter == end) {
    // does not end in colon
    return NS_OK;
  }

  iter++;  // advance over the colon
  if (iter == end) {
    // port number is missing
    return NS_OK;
  }

  nsCString portStr(Substring(iter, end));
  int32_t port = portStr.ToInteger(&rv);
  if (NS_FAILED(rv)) {
    // Failure parsing the port number
    return NS_OK;
  }

  Unused << SetPort(port);
  return NS_OK;
}

nsresult nsStandardURL::SetHost(const nsACString& input) {
  nsAutoCString hostname(input);
  hostname.StripTaggedASCII(ASCIIMask::MaskCRLFTab());

  LOG(("nsStandardURL::SetHost [host=%s]\n", hostname.get()));

  nsACString::const_iterator start, end;
  hostname.BeginReading(start);
  hostname.EndReading(end);

  FindHostLimit(start, end);

  nsDependentCSubstring flat(start, end);

  if (mURLType == URLTYPE_NO_AUTHORITY) {
    if (flat.IsEmpty()) {
      return NS_OK;
    }
    NS_WARNING("cannot set host on no-auth url");
    return NS_ERROR_UNEXPECTED;
  }

  if (mURLType == URLTYPE_AUTHORITY && flat.IsEmpty()) {
    // Setting an empty hostname is not allowed for URLTYPE_AUTHORITY.
    return NS_ERROR_UNEXPECTED;
  }

  if (mSpec.Length() + flat.Length() - Host().Length() >
      StaticPrefs::network_standard_url_max_length()) {
    return NS_ERROR_MALFORMED_URI;
  }

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });
  InvalidateCache();

  uint32_t len;
  nsAutoCString hostBuf;
  nsresult rv;
  bool allowIp =
      !SegmentIs(mScheme, "resource") && !SegmentIs(mScheme, "chrome");
  if (!flat.IsEmpty() && flat.First() == '[' && allowIp) {
    mCheckedIfHostA = true;
    rv = rusturl_parse_ipv6addr(&flat, &hostBuf);
    if (NS_FAILED(rv)) {
      return rv;
    }
  } else {
    rv = NormalizeIDN(flat, hostBuf);
    if (NS_FAILED(rv)) {
      return rv;
    }
    if (IPv4Parser::EndsInANumber(hostBuf) && allowIp) {
      nsAutoCString ipString;
      rv = IPv4Parser::NormalizeIPv4(hostBuf, ipString);
      if (NS_FAILED(rv)) {
        return rv;
      }
      hostBuf = ipString;
    }
  }

  // NormalizeIDN always copies if the call was successful
  len = hostBuf.Length();

  if (!len && (mURLType == URLTYPE_AUTHORITY || mPort != -1 ||
               Userpass(true).Length() > 0)) {
    return NS_ERROR_MALFORMED_URI;
  }

  if (mHost.mLen < 0) {
    int port_length = 0;
    if (mPort != -1) {
      nsAutoCString buf;
      buf.Assign(':');
      buf.AppendInt(mPort);
      port_length = buf.Length();
    }
    if (mAuthority.mLen > 0) {
      mHost.mPos = mAuthority.mPos + mAuthority.mLen - port_length;
      mHost.mLen = 0;
    } else if (mScheme.mLen > 0) {
      mHost.mPos = mScheme.mPos + mScheme.mLen + 3;
      mHost.mLen = 0;
    }
  }

  int32_t shift = ReplaceSegment(mHost.mPos, mHost.mLen, hostBuf.get(), len);

  if (shift) {
    mHost.mLen = len;
    mAuthority.mLen += shift;
    ShiftFromPath(shift);
  }

  return NS_OK;
}

nsresult nsStandardURL::SetPort(int32_t port) {
  LOG(("nsStandardURL::SetPort [port=%d]\n", port));

  if ((port == mPort) || (mPort == -1 && port == mDefaultPort)) {
    return NS_OK;
  }

  // ports must be >= 0 and 16 bit
  // -1 == use default
  if (port < -1 || port > std::numeric_limits<uint16_t>::max()) {
    return NS_ERROR_MALFORMED_URI;
  }

  if (mURLType == URLTYPE_NO_AUTHORITY) {
    NS_WARNING("cannot set port on no-auth url");
    return NS_ERROR_UNEXPECTED;
  }
  if (mAuthority.mLen == 0) {
    // If the URL doesn't have a hostname then setting the port to
    // -1 is a no-op. But setting it to anything else should
    // return an error.
    if (port == -1) {
      return NS_OK;
    } else {
      return NS_ERROR_UNEXPECTED;
    }
  }

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  InvalidateCache();
  if (port == mDefaultPort) {
    port = -1;
  }

  ReplacePortInSpec(port);

  mPort = port;
  return NS_OK;
}

/**
* Replaces the existing port in mSpec with aNewPort.
*
* The caller is responsible for:
*  - Calling InvalidateCache (since our mSpec is changing).
*  - Checking whether aNewPort is mDefaultPort (in which case the
*    caller should pass aNewPort=-1).
*/
void nsStandardURL::ReplacePortInSpec(int32_t aNewPort) {
  NS_ASSERTION(aNewPort != mDefaultPort || mDefaultPort == -1,
               "Caller should check its passed-in value and pass -1 instead of "
               "mDefaultPort, to avoid encoding default port into mSpec");

  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  // Create the (possibly empty) string that we're planning to replace:
  nsAutoCString buf;
  if (mPort != -1) {
    buf.Assign(':');
    buf.AppendInt(mPort);
  }
  // Find the position & length of that string:
  const uint32_t replacedLen = buf.Length();
  const uint32_t replacedStart =
      mAuthority.mPos + mAuthority.mLen - replacedLen;

  // Create the (possibly empty) replacement string:
  if (aNewPort == -1) {
    buf.Truncate();
  } else {
    buf.Assign(':');
    buf.AppendInt(aNewPort);
  }
  // Perform the replacement:
  mSpec.Replace(replacedStart, replacedLen, buf);

  // Bookkeeping to reflect the new length:
  int32_t shift = buf.Length() - replacedLen;
  mAuthority.mLen += shift;
  ShiftFromPath(shift);
}

nsresult nsStandardURL::SetPathQueryRef(const nsACString& input) {
  const nsPromiseFlatCString& path = PromiseFlatCString(input);
  LOG(("nsStandardURL::SetPathQueryRef [path=%s]\n", path.get()));
  auto onExitGuard = MakeScopeExit([&] { SanityCheck(); });

  InvalidateCache();

  if (!path.IsEmpty()) {
    nsAutoCString spec;

    spec.Assign(mSpec.get(), mPath.mPos);
    if (path.First() != '/') {
      spec.Append('/');
    }
    spec.Append(path);

    return SetSpecInternal(spec);
  }
  if (mPath.mLen >= 1) {
    mSpec.Cut(mPath.mPos + 1, mPath.mLen - 1);
    // these contain only a '/'
    mPath.mLen = 1;
    mDirectory.mLen = 1;
    mFilepath.mLen = 1;
    // these are no longer defined
    mBasename.mLen = -1;
    mExtension.mLen = -1;
    mQuery.mLen = -1;
    mRef.mLen = -1;
  }
  return NS_OK;
}

// When updating this also update SubstitutingURL::Mutator
// Queries this list of interfaces. If none match, it queries mURI.
NS_IMPL_NSIURIMUTATOR_ISUPPORTS(nsStandardURL::Mutator, nsIURISetters,
                                nsIURIMutator, nsIStandardURLMutator,
                                nsIURLMutator, nsIFileURLMutator,
                                nsISerializable)

NS_IMETHODIMP
nsStandardURL::Mutate(nsIURIMutator** aMutator) {
  RefPtr<nsStandardURL::Mutator> mutator = new nsStandardURL::Mutator();
  nsresult rv = mutator->InitFromURI(this);
  if (NS_FAILED(rv)) {
    return rv;
  }
  mutator.forget(aMutator);
  return NS_OK;
}

NS_IMETHODIMP
nsStandardURL::Equals(nsIURI* unknownOther, bool* result) {
  return EqualsInternal(unknownOther, eHonorRef, result);
}

NS_IMETHODIMP
nsStandardURL::EqualsExceptRef(nsIURI* unknownOther, bool* result) {
  return EqualsInternal(unknownOther, eIgnoreRef, result);
}

nsresult nsStandardURL::EqualsInternal(
    nsIURI* unknownOther, nsStandardURL::RefHandlingEnum refHandlingMode,
    bool* result) {
  NS_ENSURE_ARG_POINTER(unknownOther);
  MOZ_ASSERT(result, "null pointer");

  RefPtr<nsStandardURL> other;
  nsresult rv =
      unknownOther->QueryInterface(kThisImplCID, getter_AddRefs(other));
  if (NS_FAILED(rv)) {
    *result = false;
    return NS_OK;
  }

  // First, check whether one URIs is an nsIFileURL while the other
  // is not.  If that's the case, they're different.
  if (mSupportsFileURL != other->mSupportsFileURL) {
    *result = false;
    return NS_OK;
  }

  // Next check parts of a URI that, if different, automatically make the
  // URIs different
  if (!SegmentIs(mScheme, other->mSpec.get(), other->mScheme) ||
      // Check for host manually, since conversion to file will
      // ignore the host!
      !SegmentIs(mHost, other->mSpec.get(), other->mHost) ||
      !SegmentIs(mQuery, other->mSpec.get(), other->mQuery) ||
      !SegmentIs(mUsername, other->mSpec.get(), other->mUsername) ||
      !SegmentIs(mPassword, other->mSpec.get(), other->mPassword) ||
      Port() != other->Port()) {
    // No need to compare files or other URI parts -- these are different
    // beasties
    *result = false;
    return NS_OK;
  }

  if (refHandlingMode == eHonorRef &&
      !SegmentIs(mRef, other->mSpec.get(), other->mRef)) {
    *result = false;
    return NS_OK;
  }

  // Then check for exact identity of URIs.  If we have it, they're equal
  if (SegmentIs(mDirectory, other->mSpec.get(), other->mDirectory) &&
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--> --------------------

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