C++ nsAString::BeginReading方法代码示例

void
URLMainThread::SetProtocol(const nsAString& aProtocol, ErrorResult& aRv)
{
  nsAString::const_iterator start, end;
  aProtocol.BeginReading(start);
  aProtocol.EndReading(end);
  nsAString::const_iterator iter(start);

  FindCharInReadable(':', iter, end);

  // Changing the protocol of a URL, changes the "nature" of the URI
  // implementation. In order to do this properly, we have to serialize the
  // existing URL and reparse it in a new object.
  nsCOMPtr<nsIURI> clone;
  nsresult rv = NS_MutateURI(GetURI())
                  .SetScheme(NS_ConvertUTF16toUTF8(Substring(start, iter)))
                  .Finalize(clone);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  nsAutoCString href;
  rv = clone->GetSpec(href);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  nsCOMPtr<nsIURI> uri;
  rv = NS_NewURI(getter_AddRefs(uri), href);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  SetURI(uri.forget());
}

static void utf16ToUcs4(const nsAString& in, uint32_t *out, uint32_t outBufLen, uint32_t *outLen)
{
  uint32_t i = 0;
  nsAString::const_iterator start, end;
  in.BeginReading(start); 
  in.EndReading(end); 

  while (start != end) {
    PRUnichar curChar;

    curChar= *start++;

    if (start != end &&
        NS_IS_HIGH_SURROGATE(curChar) && 
        NS_IS_LOW_SURROGATE(*start)) {
      out[i] = SURROGATE_TO_UCS4(curChar, *start);
      ++start;
    }
    else
      out[i] = curChar;

    i++;
    if (i >= outBufLen) {
      NS_ERROR("input too big, the result truncated");
      out[outBufLen-1] = (uint32_t)'\0';
      *outLen = outBufLen-1;
      return;
    }
  }
  out[i] = (uint32_t)'\0';
  *outLen = i;
}

void
nsCSSScanner::Init(const nsAString& aBuffer,
                   nsIURI* aURI, uint32_t aLineNumber,
                   nsCSSStyleSheet* aSheet, mozilla::css::Loader* aLoader)
{
  NS_PRECONDITION(!mReadPointer, "Should not have an existing input buffer!");

  mReadPointer = aBuffer.BeginReading();
  mCount = aBuffer.Length();

#ifdef CSS_REPORT_PARSE_ERRORS
  // If aURI is different from mCachedURI, invalidate the filename cache.
  if (aURI != mCachedURI) {
    mCachedURI = aURI;
    mCachedFileName.Truncate();
  }
#endif // CSS_REPORT_PARSE_ERRORS

  mLineNumber = aLineNumber;

  // Reset variables that we use to keep track of our progress through the input
  mOffset = 0;
  mPushbackCount = 0;
  mRecording = false;

#ifdef CSS_REPORT_PARSE_ERRORS
  mColNumber = 0;
  mSheet = aSheet;
  mLoader = aLoader;
#endif
}

nsresult
NS_CopyUnicodeToNative(const nsAString  &input, nsACString &output)
{
    PRUint32 inputLen = input.Length();

    nsAString::const_iterator iter;
    input.BeginReading(iter);

    const PRUnichar *buf = iter.get();

    // determine length of result
    PRUint32 resultLen = 0;

    int n = ::WideCharToMultiByte(CP_ACP, 0, buf, inputLen, NULL, 0, NULL, NULL);
    if (n > 0)
        resultLen += n;

    // allocate sufficient space
    if (!EnsureStringLength(output, resultLen))
        return NS_ERROR_OUT_OF_MEMORY;
    if (resultLen > 0) {
        nsACString::iterator out_iter;
        output.BeginWriting(out_iter);

        // default "defaultChar" is '?', which is an illegal character on windows
        // file system.  That will cause file uncreatable. Change it to '_'
        const char defaultChar = '_';

        char *result = out_iter.get();

        ::WideCharToMultiByte(CP_ACP, 0, buf, inputLen, result, resultLen,
                              &defaultChar, NULL);
    }
    return NS_OK;
}

void
nsCSPParser::resetCurChar(const nsAString& aToken)
{
  mCurChar = aToken.BeginReading();
  mEndChar = aToken.EndReading();
  resetCurValue();
}

static nsresult encodeToRACE(const char* prefix, const nsAString& in, nsACString& out)
{
  // need maximum 20 bits to encode 16 bit Unicode character
  // (include null terminator)
  const uint32_t kEncodedBufSize = kMaxDNSNodeLen * 20 / 8 + 1 + 1;  

  // set up a work buffer for RACE encoder
  PRUnichar temp[kMaxDNSNodeLen + 2];
  temp[0] = 0xFFFF;   // set a place holder (to be filled by get_compress_mode)
  temp[in.Length() + 1] = (PRUnichar)'\0';

  nsAString::const_iterator start, end;
  in.BeginReading(start); 
  in.EndReading(end);
  
  for (uint32_t i = 1; start != end; i++)
    temp[i] = *start++;

  // encode nodes if non ASCII

  char encodedBuf[kEncodedBufSize];
  idn_result_t result = race_compress_encode((const unsigned short *) temp, 
                                             get_compress_mode((unsigned short *) temp + 1), 
                                             encodedBuf, kEncodedBufSize);
  if (idn_success != result)
    return NS_ERROR_FAILURE;

  out.Assign(prefix);
  out.Append(encodedBuf);

  return NS_OK;
}

void
BluetoothScoManager::NotifyAudioManager(const nsAString& aAddress) {
  MOZ_ASSERT(NS_IsMainThread());

  nsCOMPtr<nsIObserverService> obs =
    do_GetService("@mozilla.org/observer-service;1");
  NS_ENSURE_TRUE_VOID(obs);

  if (aAddress.IsEmpty()) {
    if (NS_FAILED(obs->NotifyObservers(nullptr, BLUETOOTH_SCO_STATUS_CHANGED, nullptr))) {
      NS_WARNING("Failed to notify bluetooth-sco-status-changed observsers!");
      return;
    }
  } else {
    if (NS_FAILED(obs->NotifyObservers(nullptr, BLUETOOTH_SCO_STATUS_CHANGED, aAddress.BeginReading()))) {
      NS_WARNING("Failed to notify bluetooth-sco-status-changed observsers!");
      return;
    }
  }

  nsCOMPtr<nsIAudioManager> am =
    do_GetService("@mozilla.org/telephony/audiomanager;1");
  NS_ENSURE_TRUE_VOID(am);
  am->SetForceForUse(am->USE_COMMUNICATION, am->FORCE_BT_SCO);
}

void
GDIFontEntry::InitLogFont(const nsAString& aName,
                          gfxWindowsFontType aFontType)
{
#define CLIP_TURNOFF_FONTASSOCIATION 0x40

    mLogFont.lfHeight = -1;

    // Fill in logFont structure
    mLogFont.lfWidth          = 0;
    mLogFont.lfEscapement     = 0;
    mLogFont.lfOrientation    = 0;
    mLogFont.lfUnderline      = FALSE;
    mLogFont.lfStrikeOut      = FALSE;
    mLogFont.lfCharSet        = DEFAULT_CHARSET;
    mLogFont.lfOutPrecision   = FontTypeToOutPrecision(aFontType);
    mLogFont.lfClipPrecision  = CLIP_TURNOFF_FONTASSOCIATION;
    mLogFont.lfQuality        = DEFAULT_QUALITY;
    mLogFont.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;
    // always force lfItalic if we want it.  Font selection code will
    // do its best to give us an italic font entry, but if no face exists
    // it may give us a regular one based on weight.  Windows should
    // do fake italic for us in that case.
    mLogFont.lfItalic         = mItalic;
    mLogFont.lfWeight         = mWeight;

    int len = std::min<int>(aName.Length(), LF_FACESIZE - 1);
    memcpy(&mLogFont.lfFaceName, aName.BeginReading(), len * sizeof(char16_t));
    mLogFont.lfFaceName[len] = '\0';
}

void nsStyleLinkElement::ParseLinkTypes(const nsAString& aTypes,
                                        nsTArray<nsString>& aResult)
{
  nsAString::const_iterator start, done;
  aTypes.BeginReading(start);
  aTypes.EndReading(done);
  if (start == done)
    return;

  nsAString::const_iterator current(start);
  PRBool inString = !nsCRT::IsAsciiSpace(*current);
  nsAutoString subString;

  while (current != done) {
    if (nsCRT::IsAsciiSpace(*current)) {
      if (inString) {
        ToLowerCase(Substring(start, current), subString);
        aResult.AppendElement(subString);
        inString = PR_FALSE;
      }
    }
    else {
      if (!inString) {
        start = current;
        inString = PR_TRUE;
      }
    }
    ++current;
  }
  if (inString) {
    ToLowerCase(Substring(start, current), subString);
    aResult.AppendElement(subString);
  }
}

uint32_t nsStyleLinkElement::ParseLinkTypes(const nsAString& aTypes)
{
  uint32_t linkMask = 0;
  nsAString::const_iterator start, done;
  aTypes.BeginReading(start);
  aTypes.EndReading(done);
  if (start == done)
    return linkMask;

  nsAString::const_iterator current(start);
  bool inString = !nsContentUtils::IsHTMLWhitespace(*current);
  nsAutoString subString;

  while (current != done) {
    if (nsContentUtils::IsHTMLWhitespace(*current)) {
      if (inString) {
        nsContentUtils::ASCIIToLower(Substring(start, current), subString);
        linkMask |= ToLinkMask(subString);
        inString = false;
      }
    }
    else {
      if (!inString) {
        start = current;
        inString = true;
      }
    }
    ++current;
  }
  if (inString) {
    nsContentUtils::ASCIIToLower(Substring(start, current), subString);
    linkMask |= ToLinkMask(subString);
  }
  return linkMask;
}

/* static */
mozilla::widget::Modifiers
nsDOMUIEvent::ComputeModifierState(const nsAString& aModifiersList)
{
  if (aModifiersList.IsEmpty()) {
    return 0;
  }

  // Be careful about the performance.  If aModifiersList is too long,
  // parsing it needs too long time.
  // XXX Should we abort if aModifiersList is too long?

  Modifiers modifiers = 0;

  nsAString::const_iterator listStart, listEnd;
  aModifiersList.BeginReading(listStart);
  aModifiersList.EndReading(listEnd);

  for (uint32_t i = 0; i < mozilla::ArrayLength(kPairs); i++) {
    nsAString::const_iterator start(listStart), end(listEnd);
    if (!FindInReadable(NS_ConvertASCIItoUTF16(kPairs[i].name), start, end)) {
      continue;
    }

    if ((start != listStart && !NS_IsAsciiWhitespace(*(--start))) ||
        (end != listEnd && !NS_IsAsciiWhitespace(*(end)))) {
      continue;
    }
    modifiers |= kPairs[i].modifier;
  }

  return modifiers;
}

bool
FakeInputStream::CheckTest(nsAString& aResult)
{
  return !NS_tstrcmp(aResult.BeginReading(),
                     NS_ConvertASCIItoUTF16(mTest->mResult).BeginReading())
                     ? true : false;
}

nsresult
NS_CopyUnicodeToNative(const nsAString& aInput, nsACString& aOutput)
{
  aOutput.Truncate();

  nsAString::const_iterator iter, end;
  aInput.BeginReading(iter);
  aInput.EndReading(end);

  // cannot easily avoid intermediate buffer copy.
  char temp[4096];

  nsNativeCharsetConverter conv;

  const char16_t* buf = iter.get();
  uint32_t bufLeft = Distance(iter, end);
  while (bufLeft) {
    char* p = temp;
    uint32_t tempLeft = sizeof(temp);

    nsresult rv = conv.UnicodeToNative(&buf, &bufLeft, &p, &tempLeft);
    if (NS_FAILED(rv)) {
      return rv;
    }

    if (tempLeft < sizeof(temp)) {
      aOutput.Append(temp, sizeof(temp) - tempLeft);
    }
  }
  return NS_OK;
}

double Double::toDouble(const nsAString& aSrc)
{
    txStringToDouble sink;
    nsAString::const_iterator fromBegin, fromEnd;
    copy_string(aSrc.BeginReading(fromBegin), aSrc.EndReading(fromEnd), sink);
    return sink.getDouble();
}

void
nsCSSScanner::Init(const nsAString& aBuffer,
                   nsIURI* aURI, uint32_t aLineNumber,
                   nsCSSStyleSheet* aSheet, mozilla::css::Loader* aLoader)
{
  NS_PRECONDITION(!mReadPointer, "Should not have an existing input buffer!");

  mReadPointer = aBuffer.BeginReading();
  mCount = aBuffer.Length();

#ifdef CSS_REPORT_PARSE_ERRORS
  // If aURI is the same as mURI, no need to reget mFileName -- it
  // shouldn't have changed.
  if (aURI != mURI) {
    mURI = aURI;
    if (aURI) {
      aURI->GetSpec(mFileName);
    } else {
      mFileName.Adopt(NS_strdup("from DOM"));
    }
  }
#endif // CSS_REPORT_PARSE_ERRORS
  mLineNumber = aLineNumber;

  // Reset variables that we use to keep track of our progress through the input
  mOffset = 0;
  mPushbackCount = 0;
  mRecording = false;

#ifdef CSS_REPORT_PARSE_ERRORS
  mColNumber = 0;
  mSheet = aSheet;
  mLoader = aLoader;
#endif
}