C++ nsString::Find方法代码示例

// Strip a handler command string of its quotes and parameters.
static void CleanupHandlerPath(nsString& aPath)
{
  // Example command strings passed into this routine:

  // 1) C:\Program Files\Company\some.exe -foo -bar
  // 2) C:\Program Files\Company\some.dll
  // 3) C:\Windows\some.dll,-foo -bar
  // 4) C:\Windows\some.cpl,-foo -bar

  int32_t lastCommaPos = aPath.RFindChar(',');
  if (lastCommaPos != kNotFound)
    aPath.Truncate(lastCommaPos);

  aPath.Append(' ');

  // case insensitive
  uint32_t index = aPath.Find(".exe ", true);
  if (index == kNotFound)
    index = aPath.Find(".dll ", true);
  if (index == kNotFound)
    index = aPath.Find(".cpl ", true);

  if (index != kNotFound)
    aPath.Truncate(index + 4);
  aPath.Trim(" ", true, true);
}

static void
ParseAlignAttribute(nsString& aValue, eAlign& aAlign, PRInt32& aRowIndex)
{
  // by default, the table is centered about the axis
  aRowIndex = 0;
  aAlign = eAlign_axis;
  PRInt32 len = 0;
  if (0 == aValue.Find("top")) {
    len = 3; // 3 is the length of 'top'
    aAlign = eAlign_top;
  }
  else if (0 == aValue.Find("bottom")) {
    len = 6; // 6 is the length of 'bottom'
    aAlign = eAlign_bottom;
  }
  else if (0 == aValue.Find("center")) {
    len = 6; // 6 is the length of 'center'
    aAlign = eAlign_center;
  }
  else if (0 == aValue.Find("baseline")) {
    len = 8; // 8 is the length of 'baseline'
    aAlign = eAlign_baseline;
  }
  else if (0 == aValue.Find("axis")) {
    len = 4; // 4 is the length of 'axis'
    aAlign = eAlign_axis;
  }
  if (len) {
    PRInt32 error;
    aValue.Cut(0, len); // aValue is not a const here
    aRowIndex = aValue.ToInteger(&error);
    if (error)
      aRowIndex = 0;
  }
}

// The driver ID is a string like PCI\VEN_15AD&DEV_0405&SUBSYS_040515AD, possibly
// followed by &REV_XXXX.  We uppercase the string, and strip the &REV_ part
// from it, if found.
static void normalizeDriverId(nsString& driverid) {
  ToUpperCase(driverid);
  PRInt32 rev = driverid.Find(NS_LITERAL_CSTRING("&REV_"));
  if (rev != -1) {
    driverid.Cut(rev, driverid.Length());
  }
}

/**
   Ensures basic sanity of attribute value.
   This function also (tries to :-( ) makes sure, that no
   unwanted / dangerous URLs appear in the document
   (like javascript: and data:).

   Pass the value as |aValue| arg. It will be modified in-place.

   If the value is not allowed at all, we return with NS_ERROR_ILLEGAL_VALUE.
   In that case, do not use the |aValue|, but output nothing.
 */
nsresult
mozSanitizingHTMLSerializer::SanitizeAttrValue(nsHTMLTag aTag,
                                               const nsAString& anAttrName,
                                               nsString& aValue /*inout*/)
{
  /* First, cut the attribute to 1000 chars.
     Attributes with values longer than 1000 chars seem bogus,
     considering that we don't support any JS. The longest attributes
     I can think of are URLs, and URLs with 1000 chars are likely to be
     bogus, too. */
  aValue = Substring(aValue, 0, 1000);
  //aValue.Truncate(1000); //-- this cuts half of the document !!?!!

  aValue.Adopt(escape(aValue));

  /* Check some known bad stuff. Add more!
     I don't care too much, if it happens to trigger in some innocent cases
     (like <img alt="Statistical data: Mortage rates and newspapers">) -
     security first. */
  if (aValue.Find("javascript:") != kNotFound ||
      aValue.Find("data:") != kNotFound ||
      aValue.Find("base64") != kNotFound)
    return NS_ERROR_ILLEGAL_VALUE;

  // Check img src scheme
  if (aTag == eHTMLTag_img && 
      anAttrName.LowerCaseEqualsLiteral("src"))
  {
    nsresult rv;
    nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
    NS_ENSURE_SUCCESS(rv, rv);
    nsCAutoString scheme;
    rv = ioService->ExtractScheme(NS_LossyConvertUTF16toASCII(aValue), scheme);
    NS_ENSURE_SUCCESS(rv, rv);

    if (!scheme.Equals("cid", nsCaseInsensitiveCStringComparator()))
      return NS_ERROR_ILLEGAL_VALUE;
  }

#ifdef DEBUG_BenB
  printf("attribute value for %s: -%s-\n",
         NS_LossyConvertUTF16toASCII(anAttrName).get(),
         NS_LossyConvertUTF16toASCII(aValue).get());
#endif

  return NS_OK;
}

void
MediaEngineCameraVideoSource::SetName(nsString aName)
{
  mDeviceName = aName;
  bool hasFacingMode = false;
  VideoFacingModeEnum facingMode = VideoFacingModeEnum::User;

  // Set facing mode based on device name.
#if defined(MOZ_B2G_CAMERA) && defined(MOZ_WIDGET_GONK)
  if (aName.EqualsLiteral("back")) {
    hasFacingMode = true;
    facingMode = VideoFacingModeEnum::Environment;
  } else if (aName.EqualsLiteral("front")) {
    hasFacingMode = true;
    facingMode = VideoFacingModeEnum::User;
  }
#endif // MOZ_B2G_CAMERA
#if defined(ANDROID) && !defined(MOZ_WIDGET_GONK)
  // Names are generated. Example: "Camera 0, Facing back, Orientation 90"
  //
  // See media/webrtc/trunk/webrtc/modules/video_capture/android/java/src/org/
  // webrtc/videoengine/VideoCaptureDeviceInfoAndroid.java

  if (aName.Find(NS_LITERAL_STRING("Facing back")) != kNotFound) {
    hasFacingMode = true;
    facingMode = VideoFacingModeEnum::Environment;
  } else if (aName.Find(NS_LITERAL_STRING("Facing front")) != kNotFound) {
    hasFacingMode = true;
    facingMode = VideoFacingModeEnum::User;
  }
#endif // ANDROID
#ifdef XP_MACOSX
  // Kludge to test user-facing cameras on OSX.
  if (aName.Find(NS_LITERAL_STRING("Face")) != -1) {
    hasFacingMode = true;
    facingMode = VideoFacingModeEnum::User;
  }
#endif
  if (hasFacingMode) {
    mFacingMode.Assign(NS_ConvertUTF8toUTF16(
        VideoFacingModeEnumValues::strings[uint32_t(facingMode)].value));
  } else {
    mFacingMode.Truncate();
  }
}

bool nsOutlookMail::IsAddressBookNameUnique(nsString& name, nsString& list)
{
  nsString    usedName;
  usedName.AppendLiteral("[");
  usedName.Append(name);
  usedName.AppendLiteral("],");

  return list.Find(usedName) == -1;
}

void
EmbedAuthPromptService::DoResponseAsyncPrompt(EmbedAsyncAuthPrompt* prompt,
                                              const bool& confirmed,
                                              const nsString& username,
                                              const nsString& password)
{
    nsresult rv;
    asyncPrompts.erase(prompt->mHashKey.get());
    prompt->mInProgress = false;
    if (prompt->mWin) {
        asyncPromptInProgress.erase(prompt->mWin);
    }
    // Fill authentication information with username and password provided
    // by user.
    uint32_t flags;
    rv = prompt->mAuthInfo->GetFlags(&flags);
    NS_ENSURE_SUCCESS(rv, );
    if (!username.IsEmpty()) {
        if (flags & nsIAuthInformation::NEED_DOMAIN) {
            // Domain is separated from username by a backslash
            int idx = username.Find("\\");
            if (idx == -1) {
                prompt->mAuthInfo->SetUsername(username);
            } else {
                prompt->mAuthInfo->SetDomain(nsDependentSubstring(username, 0, idx));
                prompt->mAuthInfo->SetUsername(nsDependentSubstring(username, idx + 1));
            }
        } else {
            prompt->mAuthInfo->SetUsername(username);
        }
    }

    if (!password.IsEmpty()) {
        prompt->mAuthInfo->SetPassword(password);
    }

    for (unsigned int i = 0; i < prompt->consumers.Length(); i++) {
        nsRefPtr<nsAuthCancelableConsumer> consumer = static_cast<nsAuthCancelableConsumer*>(prompt->consumers[i].get());
        if (!consumer->mCallback) {
            // Not having a callback means that consumer didn't provide it
            // or canceled the notification.
            continue;
        }
        if (confirmed) {
            // printf("Ok, calling onAuthAvailable to finish auth.\n");
            consumer->mCallback->OnAuthAvailable(consumer->mContext, prompt->mAuthInfo);
        } else {
            // printf("Cancelled, calling onAuthCancelled to finish auth.\n");
            consumer->mCallback->OnAuthCancelled(consumer->mContext, true);
        }
    }

    // Process the next prompt, if one is pending.
    DoAsyncPrompt();
}

static void
ParseAlignAttribute(nsString& aValue, eAlign& aAlign, int32_t& aRowIndex)
{
  // by default, the table is centered about the axis
  aRowIndex = 0;
  aAlign = eAlign_axis;
  int32_t len = 0;

  // we only have to remove the leading spaces because 
  // ToInteger ignores the whitespaces around the number
  aValue.CompressWhitespace(true, false);

  if (0 == aValue.Find("top")) {
    len = 3; // 3 is the length of 'top'
    aAlign = eAlign_top;
  }
  else if (0 == aValue.Find("bottom")) {
    len = 6; // 6 is the length of 'bottom'
    aAlign = eAlign_bottom;
  }
  else if (0 == aValue.Find("center")) {
    len = 6; // 6 is the length of 'center'
    aAlign = eAlign_center;
  }
  else if (0 == aValue.Find("baseline")) {
    len = 8; // 8 is the length of 'baseline'
    aAlign = eAlign_baseline;
  }
  else if (0 == aValue.Find("axis")) {
    len = 4; // 4 is the length of 'axis'
    aAlign = eAlign_axis;
  }
  if (len) {
    nsresult error;
    aValue.Cut(0, len); // aValue is not a const here
    aRowIndex = aValue.ToInteger(&error);
    if (NS_FAILED(error))
      aRowIndex = 0;
  }
}

// Strip the windows host process bootstrap executable rundll32.exe
// from a handler's command string if it exists.
static void StripRundll32(nsString& aCommandString)
{
  // Example rundll formats:
  // C:\Windows\System32\rundll32.exe "path to dll"
  // rundll32.exe "path to dll"
  // C:\Windows\System32\rundll32.exe "path to dll", var var
  // rundll32.exe "path to dll", var var

  NS_NAMED_LITERAL_STRING(rundllSegment, "rundll32.exe ");
  NS_NAMED_LITERAL_STRING(rundllSegmentShort, "rundll32 ");

  // case insensitive
  int32_t strLen = rundllSegment.Length();
  int32_t index = aCommandString.Find(rundllSegment, true);
  if (index == kNotFound) {
    strLen = rundllSegmentShort.Length();
    index = aCommandString.Find(rundllSegmentShort, true);
  }

  if (index != kNotFound) {
    uint32_t rundllSegmentLength = index + strLen;
    aCommandString.Cut(0, rundllSegmentLength);
  }
}

void nsEudoraCompose::ExtractCharset( nsString& str)
{
  nsString tStr;
  PRInt32 idx = str.Find( "charset=", PR_TRUE);
  if (idx != -1) {
    idx += 8;
    str.Right( tStr, str.Length() - idx);
    idx = tStr.FindChar( ';');
    if (idx != -1)
      tStr.Left( str, idx);
    else
      str = tStr;
    str.Trim( kWhitespace);
    if ((str.CharAt( 0) == '"') && (str.Length() > 2)) {
      str.Mid( tStr, 1, str.Length() - 2);
      str = tStr;
      str.Trim( kWhitespace);
    }
  }
  else
    str.Truncate();
}

nsresult
nsRDFParserUtils::GetQuotedAttributeValue(const nsString& aSource,
                                          const nsString& aAttribute,
                                          nsString& aValue)
{
static const char kQuote = '\"';
static const char kApostrophe = '\'';

    PRInt32 offset;
    PRInt32 endOffset = -1;
    nsresult result = NS_OK;

    offset = aSource.Find(aAttribute, 0);
    if (-1 != offset) {
        offset = aSource.FindChar('=', offset);

        PRUnichar next = aSource.CharAt(++offset);
        if (kQuote == next) {
            endOffset = aSource.FindChar(kQuote, ++offset);
        }
        else if (kApostrophe == next) {
            endOffset = aSource.FindChar(kApostrophe, ++offset);
        }

        if (-1 != endOffset) {
            aSource.Mid(aValue, offset, endOffset-offset);
        }
        else {
            // Mismatched quotes - return an error
            result = NS_ERROR_FAILURE;
        }
    }
    else {
        aValue.Truncate();
    }

    return result;
}

void
mozTXTToHTMLConv::ScanHTML(nsString& aInString, PRUint32 whattodo, nsString &aOutString)
{ 
  // some common variables we were recalculating
  // every time inside the for loop...
  PRInt32 lengthOfInString = aInString.Length();
  const PRUnichar * uniBuffer = aInString.get();

#ifdef DEBUG_BenB_Perf
  PRTime parsing_start = PR_IntervalNow();
#endif

  // Look for simple entities not included in a tags and scan them.
  /* Skip all tags ("<[...]>") and content in an a tag ("<a[...]</a>")
     or in a tag ("<!--[...]-->").
     Unescape the rest (text between tags) and pass it to ScanTXT. */
  for (PRInt32 i = 0; i < lengthOfInString;)
  {
    if (aInString[i] == '<')  // html tag
    {
      PRUint32 start = PRUint32(i);
      if (nsCRT::ToLower((char)aInString[PRUint32(i) + 1]) == 'a')
           // if a tag, skip until </a>
      {
        i = aInString.Find("</a>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 4;
      }
      else if (aInString[PRUint32(i) + 1] == '!' && aInString[PRUint32(i) + 2] == '-' &&
        aInString[PRUint32(i) + 3] == '-')
          //if out-commended code, skip until -->
      {
        i = aInString.Find("-->", false, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 3;

      }
      else  // just skip tag (attributes etc.)
      {
        i = aInString.FindChar('>', i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i++;
      }
      aOutString.Append(&uniBuffer[start], PRUint32(i) - start);
    }
    else
    {
      PRUint32 start = PRUint32(i);
      i = aInString.FindChar('<', i);
      if (i == kNotFound)
        i = lengthOfInString;
  
      nsString tempString;     
      tempString.SetCapacity(PRUint32((PRUint32(i) - start) * growthRate));
      UnescapeStr(uniBuffer, start, PRUint32(i) - start, tempString);
      ScanTXT(tempString.get(), tempString.Length(), whattodo, aOutString);
    }
  }

#ifdef DEBUG_BenB_Perf
  printf("ScanHTML time:    %d ms\n", PR_IntervalToMilliseconds(PR_IntervalNow() - parsing_start));
#endif
}

void
mozTXTToHTMLConv::ScanHTML(nsString& aInString, uint32_t whattodo, nsString &aOutString)
{ 
  // some common variables we were recalculating
  // every time inside the for loop...
  int32_t lengthOfInString = aInString.Length();
  const char16_t * uniBuffer = aInString.get();

#ifdef DEBUG_BenB_Perf
  PRTime parsing_start = PR_IntervalNow();
#endif

  // Look for simple entities not included in a tags and scan them.
  // Skip all tags ("<[...]>") and content in an a link tag ("<a [...]</a>"),
  // comment tag ("<!--[...]-->"), style tag, script tag or head tag.
  // Unescape the rest (text between tags) and pass it to ScanTXT.
  for (int32_t i = 0; i < lengthOfInString;)
  {
    if (aInString[i] == '<')  // html tag
    {
      int32_t start = i;
      if (Substring(aInString, i + 1, 2).LowerCaseEqualsASCII("a "))
           // if a tag, skip until </a>.
           // Make sure there's a space after, not to match "abbr".
      {
        i = aInString.Find("</a>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 4;
      }
      else if (Substring(aInString, i + 1, 3).LowerCaseEqualsASCII("!--"))
          // if out-commended code, skip until -->
      {
        i = aInString.Find("-->", false, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 3;
      }
      else if (Substring(aInString, i + 1, 5).LowerCaseEqualsASCII("style") &&
               (aInString.CharAt(i + 6) == ' ' || aInString.CharAt(i + 6) == '>'))
           // if style tag, skip until </style>
      {
        i = aInString.Find("</style>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 8;
      }
      else if (Substring(aInString, i + 1, 6).LowerCaseEqualsASCII("script") &&
               (aInString.CharAt(i + 7) == ' ' || aInString.CharAt(i + 7) == '>'))
           // if script tag, skip until </script>
      {
        i = aInString.Find("</script>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 9;
      }
      else if (Substring(aInString, i + 1, 4).LowerCaseEqualsASCII("head") &&
               (aInString.CharAt(i + 5) == ' ' || aInString.CharAt(i + 5) == '>'))
           // if head tag, skip until </head>
           // Make sure not to match <header>.
      {
        i = aInString.Find("</head>", true, i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i += 7;
      }
      else  // just skip tag (attributes etc.)
      {
        i = aInString.FindChar('>', i);
        if (i == kNotFound)
          i = lengthOfInString;
        else
          i++;
      }
      aOutString.Append(&uniBuffer[start], i - start);
    }
    else
    {
      uint32_t start = uint32_t(i);
      i = aInString.FindChar('<', i);
      if (i == kNotFound)
        i = lengthOfInString;
  
      nsString tempString;     
      tempString.SetCapacity(uint32_t((uint32_t(i) - start) * growthRate));
      UnescapeStr(uniBuffer, start, uint32_t(i) - start, tempString);
      ScanTXT(tempString.get(), tempString.Length(), whattodo, aOutString);
    }
  }

#ifdef DEBUG_BenB_Perf
  printf("ScanHTML time:    %d ms\n", PR_IntervalToMilliseconds(PR_IntervalNow() - parsing_start));
#endif
}

void 
nsPageFrame::ProcessSpecialCodes(const nsString& aStr, nsString& aNewStr)
{

  aNewStr = aStr;

  // Search to see if the &D code is in the string 
  // then subst in the current date/time
  NS_NAMED_LITERAL_STRING(kDate, "&D");
  if (aStr.Find(kDate) != kNotFound) {
    if (mPD->mDateTimeStr != nsnull) {
      aNewStr.ReplaceSubstring(kDate.get(), mPD->mDateTimeStr);
    } else {
      aNewStr.ReplaceSubstring(kDate.get(), EmptyString().get());
    }
  }

  // NOTE: Must search for &PT before searching for &P
  //
  // Search to see if the "page number and page" total code are in the string
  // and replace the page number and page total code with the actual
  // values
  NS_NAMED_LITERAL_STRING(kPageAndTotal, "&PT");
  if (aStr.Find(kPageAndTotal) != kNotFound) {
    PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumAndTotalsFormat, mPageNum, mTotNumPages);
    aNewStr.ReplaceSubstring(kPageAndTotal.get(), uStr);
    nsMemory::Free(uStr);
  }

  // Search to see if the page number code is in the string
  // and replace the page number code with the actual value
  NS_NAMED_LITERAL_STRING(kPage, "&P");
  if (aStr.Find(kPage) != kNotFound) {
    PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat, mPageNum);
    aNewStr.ReplaceSubstring(kPage.get(), uStr);
    nsMemory::Free(uStr);
  }

  NS_NAMED_LITERAL_STRING(kTitle, "&T");
  if (aStr.Find(kTitle) != kNotFound) {
    if (mPD->mDocTitle != nsnull) {
      aNewStr.ReplaceSubstring(kTitle.get(), mPD->mDocTitle);
    } else {
      aNewStr.ReplaceSubstring(kTitle.get(), EmptyString().get());
    }
  }

  NS_NAMED_LITERAL_STRING(kDocURL, "&U");
  if (aStr.Find(kDocURL) != kNotFound) {
    if (mPD->mDocURL != nsnull) {
      aNewStr.ReplaceSubstring(kDocURL.get(), mPD->mDocURL);
    } else {
      aNewStr.ReplaceSubstring(kDocURL.get(), EmptyString().get());
    }
  }

  NS_NAMED_LITERAL_STRING(kPageTotal, "&L");
  if (aStr.Find(kPageTotal) != kNotFound) {
    PRUnichar * uStr = nsTextFormatter::smprintf(mPD->mPageNumFormat, mTotNumPages);
    aNewStr.ReplaceSubstring(kPageTotal.get(), uStr);
    nsMemory::Free(uStr);
  }
}

bool nsTextAddress::GetField(const nsAString &aLine, int32_t index,
                             nsString &field, char16_t delim) {
  bool result = false;
  int32_t pos = 0;
  int32_t maxLen = aLine.Length();
  char16_t tab = char16_t('\t');
  char16_t doubleQuote = char16_t('"');

  field.Truncate();

  if (delim == tab) tab = 0;

  while (index && (pos < maxLen)) {
    while (((aLine[pos] == char16_t(' ')) || (aLine[pos] == tab)) &&
           (pos < maxLen)) {
      pos++;
    }
    if (pos >= maxLen) break;
    if (aLine[pos] == doubleQuote) {
      do {
        pos++;
        if (((pos + 1) < maxLen) && (aLine[pos] == doubleQuote) &&
            (aLine[pos + 1] == doubleQuote)) {
          pos += 2;
        }
      } while ((pos < maxLen) && (aLine[pos] != doubleQuote));
      if (pos < maxLen) pos++;
    }
    if (pos >= maxLen) break;

    while ((pos < maxLen) && (aLine[pos] != delim)) pos++;

    if (pos >= maxLen) break;

    index--;
    pos++;
  }

  if (pos >= maxLen) return result;

  result = true;

  while ((pos < maxLen) && ((aLine[pos] == ' ') || (aLine[pos] == tab))) pos++;

  int32_t fLen = 0;
  int32_t startPos = pos;
  bool quoted = false;
  if (aLine[pos] == '"') {
    startPos++;
    fLen = -1;
    do {
      pos++;
      fLen++;
      if (((pos + 1) < maxLen) && (aLine[pos] == doubleQuote) &&
          (aLine[pos + 1] == doubleQuote)) {
        quoted = true;
        pos += 2;
        fLen += 2;
      }
    } while ((pos < maxLen) && (aLine[pos] != doubleQuote));
  } else {
    while ((pos < maxLen) && (aLine[pos] != delim)) {
      pos++;
      fLen++;
    }
  }

  if (!fLen) {
    return result;
  }

  field.Append(nsDependentSubstring(aLine, startPos, fLen));
  field.Trim(kWhitespace);

  if (quoted) {
    int32_t offset = field.Find("\"\"");
    while (offset != -1) {
      field.Cut(offset, 1);
      offset = MsgFind(field, "\"\"", false, offset + 1);
    }
  }

  return result;
}