C++ nsAString::Append方法代码示例

void
nsHTMLContentSerializer::SerializeAttributes(nsIContent* aContent,
        nsIAtom* aTagName,
        nsAString& aStr)
{
    nsresult rv;
    PRUint32 index, count;
    nsAutoString nameStr, valueStr;

    count = aContent->GetAttrCount();

    NS_NAMED_LITERAL_STRING(_mozStr, "_moz");

    // Loop backward over the attributes, since the order they are stored in is
    // the opposite of the order they were parsed in (see bug 213347 for reason).
    // index is unsigned, hence index >= 0 is always true.
    for (index = count; index > 0; ) {
        --index;
        const nsAttrName* name = aContent->GetAttrNameAt(index);
        PRInt32 namespaceID = name->NamespaceID();
        nsIAtom* attrName = name->LocalName();

        // Filter out any attribute starting with [-|_]moz
        const char* sharedName;
        attrName->GetUTF8String(&sharedName);
        if ((('_' == *sharedName) || ('-' == *sharedName)) &&
                !nsCRT::strncmp(sharedName+1, kMozStr, PRUint32(sizeof(kMozStr)-1))) {
            continue;
        }
        aContent->GetAttr(namespaceID, attrName, valueStr);

        //
        // Filter out special case of <br type="_moz"> or <br _moz*>,
        // used by the editor.  Bug 16988.  Yuck.
        //
        if (aTagName == nsGkAtoms::br && attrName == nsGkAtoms::type &&
                StringBeginsWith(valueStr, _mozStr)) {
            continue;
        }

        if (mIsCopying && mIsFirstChildOfOL && (aTagName == nsGkAtoms::li) &&
                (attrName == nsGkAtoms::value)) {
            // This is handled separately in SerializeLIValueAttribute()
            continue;
        }
        PRBool isJS = IsJavaScript(attrName, valueStr);

        if (((attrName == nsGkAtoms::href) ||
                (attrName == nsGkAtoms::src))) {
            // Make all links absolute when converting only the selection:
            if (mFlags & nsIDocumentEncoder::OutputAbsoluteLinks) {
                // Would be nice to handle OBJECT and APPLET tags,
                // but that gets more complicated since we have to
                // search the tag list for CODEBASE as well.
                // For now, just leave them relative.
                nsCOMPtr<nsIURI> uri = aContent->GetBaseURI();
                if (uri) {
                    nsAutoString absURI;
                    rv = NS_MakeAbsoluteURI(absURI, valueStr, uri);
                    if (NS_SUCCEEDED(rv)) {
                        valueStr = absURI;
                    }
                }
            }
            // Need to escape URI.
            nsAutoString tempURI(valueStr);
            if (!isJS && NS_FAILED(EscapeURI(tempURI, valueStr)))
                valueStr = tempURI;
        }

        if (mIsWholeDocument && aTagName == nsGkAtoms::meta &&
                attrName == nsGkAtoms::content) {
            // If we're serializing a <meta http-equiv="content-type">,
            // use the proper value, rather than what's in the document.
            nsAutoString header;
            aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::httpEquiv, header);
            if (header.LowerCaseEqualsLiteral("content-type")) {
                valueStr = NS_LITERAL_STRING("text/html; charset=") +
                           NS_ConvertASCIItoUTF16(mCharset);
            }
        }

        attrName->ToString(nameStr);

        /*If we already crossed the MaxColumn limit or
        * if this attr name-value pair(including a space,=,opening and closing quotes) is greater than MaxColumn limit
        * then start the attribute from a new line.
        */

        if (mDoFormat
                && (mColPos >= mMaxColumn
                    || ((PRInt32)(mColPos + nameStr.Length() +
                                  valueStr.Length() + 4) > mMaxColumn))) {
            aStr.Append(mLineBreak);
            mColPos = 0;
        }

        // Expand shorthand attribute.
        if (IsShorthandAttr(attrName, aTagName) && valueStr.IsEmpty()) {
            valueStr = nameStr;
//.........这里部分代码省略.........

nsresult
nsXULContentUtils::GetTextForNode(nsIRDFNode* aNode, nsAString& aResult)
{
    if (! aNode) {
        aResult.Truncate();
        return NS_OK;
    }

    nsresult rv;

    // Literals are the most common, so try these first.
    nsCOMPtr<nsIRDFLiteral> literal = do_QueryInterface(aNode);
    if (literal) {
        const char16_t* p;
        rv = literal->GetValueConst(&p);
        if (NS_FAILED(rv)) return rv;

        aResult = p;
        return NS_OK;
    }

    nsCOMPtr<nsIRDFDate> dateLiteral = do_QueryInterface(aNode);
    if (dateLiteral) {
        PRTime value;
        rv = dateLiteral->GetValue(&value);
        if (NS_FAILED(rv)) return rv;

        nsAutoString str;
        rv = gFormat->FormatPRTime(nullptr /* nsILocale* locale */,
                                  kDateFormatShort,
                                  kTimeFormatSeconds,
                                  value,
                                  str);
        aResult.Assign(str);

        if (NS_FAILED(rv)) return rv;

        return NS_OK;
    }

    nsCOMPtr<nsIRDFInt> intLiteral = do_QueryInterface(aNode);
    if (intLiteral) {
        int32_t	value;
        rv = intLiteral->GetValue(&value);
        if (NS_FAILED(rv)) return rv;

        aResult.Truncate();
        nsAutoString intStr;
        intStr.AppendInt(value, 10);
        aResult.Append(intStr);
        return NS_OK;
    }


    nsCOMPtr<nsIRDFResource> resource = do_QueryInterface(aNode);
    if (resource) {
        const char* p;
        rv = resource->GetValueConst(&p);
        if (NS_FAILED(rv)) return rv;
        CopyUTF8toUTF16(p, aResult);
        return NS_OK;
    }

    NS_ERROR("not a resource or a literal");
    return NS_ERROR_UNEXPECTED;
}

void
nsCSPSchemeSrc::toString(nsAString& outStr) const
{
  outStr.Append(mScheme);
  outStr.AppendASCII(":");
}

void
nsCSSValue::AppendToString(nsCSSProperty aProperty, nsAString& aResult) const
{
  // eCSSProperty_UNKNOWN gets used for some recursive calls below.
  NS_ABORT_IF_FALSE((0 <= aProperty &&
                     aProperty <= eCSSProperty_COUNT_no_shorthands) ||
                    aProperty == eCSSProperty_UNKNOWN,
                    "property ID out of range");

  nsCSSUnit unit = GetUnit();
  if (unit == eCSSUnit_Null) {
    return;
  }

  if (eCSSUnit_String <= unit && unit <= eCSSUnit_Attr) {
    if (unit == eCSSUnit_Attr) {
      aResult.AppendLiteral("attr(");
    }
    nsAutoString  buffer;
    GetStringValue(buffer);
    if (unit == eCSSUnit_String) {
      nsStyleUtil::AppendEscapedCSSString(buffer, aResult);
    } else if (unit == eCSSUnit_Families) {
      // XXX We really need to do *some* escaping.
      aResult.Append(buffer);
    } else {
      nsStyleUtil::AppendEscapedCSSIdent(buffer, aResult);
    }
  }
  else if (eCSSUnit_Array <= unit && unit <= eCSSUnit_Cubic_Bezier) {
    switch (unit) {
      case eCSSUnit_Counter:  aResult.AppendLiteral("counter(");  break;
      case eCSSUnit_Counters: aResult.AppendLiteral("counters("); break;
      case eCSSUnit_Cubic_Bezier: aResult.AppendLiteral("cubic-bezier("); break;
      default: break;
    }

    nsCSSValue::Array *array = GetArrayValue();
    PRBool mark = PR_FALSE;
    for (size_t i = 0, i_end = array->Count(); i < i_end; ++i) {
      if (aProperty == eCSSProperty_border_image && i >= 5) {
        if (array->Item(i).GetUnit() == eCSSUnit_Null) {
          continue;
        }
        if (i == 5) {
          aResult.AppendLiteral(" /");
        }
      }
      if (mark && array->Item(i).GetUnit() != eCSSUnit_Null) {
        if (unit == eCSSUnit_Array &&
            eCSSProperty_transition_timing_function != aProperty)
          aResult.AppendLiteral(" ");
        else
          aResult.AppendLiteral(", ");
      }
      nsCSSProperty prop =
        ((eCSSUnit_Counter <= unit && unit <= eCSSUnit_Counters) &&
         i == array->Count() - 1)
        ? eCSSProperty_list_style_type : aProperty;
      if (array->Item(i).GetUnit() != eCSSUnit_Null) {
        array->Item(i).AppendToString(prop, aResult);
        mark = PR_TRUE;
      }
    }
    if (eCSSUnit_Array == unit &&
        aProperty == eCSSProperty_transition_timing_function) {
      aResult.AppendLiteral(")");
    }
  }
  /* Although Function is backed by an Array, we'll handle it separately
   * because it's a bit quirky.
   */
  else if (eCSSUnit_Function == unit) {
    const nsCSSValue::Array* array = GetArrayValue();
    NS_ABORT_IF_FALSE(array->Count() >= 1,
                      "Functions must have at least one element for the name.");

    /* Append the function name. */
    const nsCSSValue& functionName = array->Item(0);
    if (functionName.GetUnit() == eCSSUnit_Enumerated) {
      // We assume that the first argument is always of nsCSSKeyword type.
      const nsCSSKeyword functionId =
        static_cast<nsCSSKeyword>(functionName.GetIntValue());
      nsStyleUtil::AppendEscapedCSSIdent(
        NS_ConvertASCIItoUTF16(nsCSSKeywords::GetStringValue(functionId)),
        aResult);
    } else {
      functionName.AppendToString(aProperty, aResult);
    }
    aResult.AppendLiteral("(");

    /* Now, step through the function contents, writing each of them as we go. */
    for (size_t index = 1; index < array->Count(); ++index) {
      array->Item(index).AppendToString(aProperty, aResult);

      /* If we're not at the final element, append a comma. */
      if (index + 1 != array->Count())
        aResult.AppendLiteral(", ");
    }

//.........这里部分代码省略.........

void
nsWin32Locale::GetXPLocale(LCID winLCID, nsAString& locale)
{
  initFunctionPointers ();

  if (lcidToLocaleName)
  {
    WCHAR ret_locale[LOCALE_NAME_MAX_LENGTH];
    int rv = lcidToLocaleName(winLCID, ret_locale, LOCALE_NAME_MAX_LENGTH, 0);
    // rv 0 means that the function failed to match up the LCID, so we fallback
    // to the old function
    if (rv != 0)
    {
      locale.Assign(ret_locale);
      return;
    }
  }

  DWORD    lang_id, sublang_id;
  size_t   i, j;

  lang_id = PRIMARYLANGID(LANGIDFROMLCID(winLCID));
  sublang_id = SUBLANGID(LANGIDFROMLCID(winLCID));

  /* Special-case Norwegian Bokmal and Norwegian Nynorsk, which have the same
     LANG_ID on Windows, but have separate ISO-639-2 codes */
  if (lang_id == LANG_NORWEGIAN) {
    if (sublang_id == SUBLANG_NORWEGIAN_BOKMAL) {
      locale.AssignASCII("nb-NO");
    } else if (sublang_id == SUBLANG_NORWEGIAN_NYNORSK) {
      locale.AssignASCII("nn-NO");
    } else {
      locale.AssignASCII("no-NO");
    }
    return;
  }

  for(i=0;i<LENGTH_MAPPING_LIST;i++) {
    if (lang_id==iso_list[i].win_code) {
      /* Special-case Croatian and Serbian, which have the same LANG_ID on
         Windows, but have been split into separate ISO-639-2 codes */
      if (lang_id == LANG_CROATIAN) {
        if (sublang_id == SUBLANG_DEFAULT) {
          locale.AssignLiteral(CROATIAN_ISO_CODE);
        } else {
          locale.AssignLiteral(SERBIAN_ISO_CODE);
        }
      } else {
        locale.AssignASCII(iso_list[i].iso_code);
      }
      for(j=0;iso_list[i].sublang_list[j].win_code;j++) {
        if (sublang_id == iso_list[i].sublang_list[j].win_code) {
          locale.Append(PRUnichar('-'));
          locale.AppendASCII(iso_list[i].sublang_list[j].iso_code);
          break;
        }
      }
      return;
    }
  }

  //
  // didn't find any match. fall back to en-US, which is better 
  // than unusable buttons without 'OK', 'Cancel', etc (bug 224546)       
  //
  locale.AssignLiteral("en-US"); 
  return;
}

NS_IMETHODIMP
nsLocation::GetHash(nsAString& aHash)
{
  if (!CallerSubsumes())
    return NS_ERROR_DOM_SECURITY_ERR;

  aHash.SetLength(0);

  nsCOMPtr<nsIURI> uri;
  nsresult rv = GetURI(getter_AddRefs(uri));
  if (NS_FAILED(rv) || !uri) {
    return rv;
  }

  nsAutoCString ref;
  nsAutoString unicodeRef;

  rv = uri->GetRef(ref);

  if (nsContentUtils::EncodeDecodeURLHash()) {
    if (NS_SUCCEEDED(rv)) {
      nsCOMPtr<nsITextToSubURI> textToSubURI(
          do_GetService(NS_ITEXTTOSUBURI_CONTRACTID, &rv));

      if (NS_SUCCEEDED(rv)) {
        nsAutoCString charset;
        uri->GetOriginCharset(charset);

        rv = textToSubURI->UnEscapeURIForUI(charset, ref, unicodeRef);
      }

      if (NS_FAILED(rv)) {
        // Oh, well.  No intl here!
        NS_UnescapeURL(ref);
        CopyASCIItoUTF16(ref, unicodeRef);
        rv = NS_OK;
      }
    }

    if (NS_SUCCEEDED(rv) && !unicodeRef.IsEmpty()) {
      aHash.Assign(char16_t('#'));
      aHash.Append(unicodeRef);
    }
  } else { // URL Hash should simply return the value of the Ref segment
    if (NS_SUCCEEDED(rv) && !ref.IsEmpty()) {
      aHash.Assign(char16_t('#'));
      AppendUTF8toUTF16(ref, aHash);
    }
  }

  if (aHash == mCachedHash) {
    // Work around ShareThis stupidly polling location.hash every
    // 5ms all the time by handing out the same exact string buffer
    // we handed out last time.
    aHash = mCachedHash;
  } else {
    mCachedHash = aHash;
  }

  return rv;
}

void nsCSSSelector::ToStringInternal(nsAString& aString,
                                     nsICSSStyleSheet* aSheet,
                                     PRBool aIsPseudoElem,
                                     PRIntn aNegatedIndex,
                                     const nsString& aIdPrefix) const
{
  nsAutoString temp;
  PRBool aIsNegated = PRBool(0 < aNegatedIndex);
  PRBool isPseudoElement = IsPseudoElement(mTag);

  // selectors are linked from right-to-left, so the next selector in the linked list
  // actually precedes this one in the resulting string
  if (mNext) {
    mNext->ToStringInternal(aString, aSheet, IsPseudoElement(mTag), 0,
                            aIdPrefix);
    if (!aIsNegated && !isPseudoElement) {
      // don't add a leading whitespace if we have a pseudo-element
      // or a negated simple selector
      aString.Append(PRUnichar(' '));
    }
  }
  if (1 < aNegatedIndex) {
    // the first mNegations does not contain a negated type element selector
    // or a negated universal selector
    NS_IF_NEGATED_START(aIsNegated, aString)
  }

  // For non-pseudo-element selectors or for lone pseudo-elements, deal with
  // namespace prefixes.
  if (!isPseudoElement || !mNext) {
    // append the namespace prefix if needed
    if (mNameSpace == kNameSpaceID_None) {
      // The only way to do this in CSS is to have an explicit namespace
      // of "none" specified in the sheet by having a '|' with nothing
      // before it.
      aString.Append(PRUnichar('|'));
    } else {
#ifndef FBML
      if (aSheet) {
        nsXMLNameSpaceMap *sheetNS = aSheet->GetNameSpaceMap();
        // sheetNS is non-null if and only if we had an @namespace rule.  If it's
        // null, that means that the only namespaces we could have are the
        // wildcard namespace (which can be implicit in this case) and the "none"
        // namespace, which we handled above.  So no need to output anything when
        // sheetNS is null.
        if (sheetNS) {
          nsIAtom *prefixAtom = nsnull;
          // prefixAtom is non-null if and only if we have a prefix other than
          // '*'
          if (mNameSpace != kNameSpaceID_Unknown) {
            prefixAtom = sheetNS->FindPrefix(mNameSpace);
          }
          if (prefixAtom) {
            nsAutoString prefix;
            prefixAtom->ToString(prefix);
            aString.Append(prefix);
            aString.Append(PRUnichar('|'));
          } else if (mNameSpace == kNameSpaceID_Unknown) {
            // explicit *| or only non-default namespace rules and we're not
            // using any of those namespaces
            aString.AppendLiteral("*|");
          }
          // else we are in the default namespace and don't need to output
          // anything
        }
      }
#endif
    }
  }

  // smells like a universal selector
  if (!mTag && !mIDList && !mClassList) {
    if (1 != aNegatedIndex) {
      aString.Append(PRUnichar('*'));
    }
    if (1 < aNegatedIndex) {
      NS_IF_NEGATED_END(aIsNegated, aString)
    }
  } else {
    // Append the tag name, if there is one
    if (mTag) {

void
txErrorExpr::toString(nsAString& aStr)
{
    aStr.Append(mStr);
}

void URL::GetProtocol(nsAString& aProtocol) const {
  URL_GETTER(aProtocol, GetScheme);
  aProtocol.Append(char16_t(':'));
}

void nsCSSSelector::ToStringInternal(nsAString& aString,
                                     nsICSSStyleSheet* aSheet,
                                     PRBool aIsPseudoElem,
                                     PRBool aIsNegated) const
{
  nsAutoString temp;
  PRBool isPseudoElement = IsPseudoElement(mTag);
  
  // selectors are linked from right-to-left, so the next selector in the linked list
  // actually precedes this one in the resulting string
  if (mNext) {
    mNext->ToStringInternal(aString, aSheet, IsPseudoElement(mTag), 0);
    if (!aIsNegated && !isPseudoElement) {
      // don't add a leading whitespace if we have a pseudo-element
      // or a negated simple selector
      aString.Append(PRUnichar(' '));
    }
  }

  // For non-pseudo-element selectors or for lone pseudo-elements, deal with
  // namespace prefixes.
  PRBool wroteNamespace = PR_FALSE;
  if (!isPseudoElement || !mNext) {
    // append the namespace prefix if needed
    if (mNameSpace == kNameSpaceID_None) {
      // The only way to do this in CSS is to have an explicit namespace
      // of "none" specified in the sheet by having a '|' with nothing
      // before it.
      aString.Append(PRUnichar('|'));
      wroteNamespace = PR_TRUE;
    } else {
      if (aSheet) {
        nsXMLNameSpaceMap *sheetNS = aSheet->GetNameSpaceMap();
    
        // sheetNS is non-null if and only if we had an @namespace rule.  If it's
        // null, that means that the only namespaces we could have are the
        // wildcard namespace (which can be implicit in this case) and the "none"
        // namespace, which we handled above.  So no need to output anything when
        // sheetNS is null.
        if (sheetNS) {
          if (mNameSpace != kNameSpaceID_Unknown) {
            if (sheetNS->FindNameSpaceID(nsnull) != mNameSpace) {
              nsIAtom *prefixAtom = sheetNS->FindPrefix(mNameSpace);
              NS_ASSERTION(prefixAtom, "how'd we get a non-default namespace "
                                       "without a prefix?");
              nsAutoString prefix;
              prefixAtom->ToString(prefix);
              aString.Append(prefix);
              aString.Append(PRUnichar('|'));
              wroteNamespace = PR_TRUE;
            }
            // otherwise it must be the default namespace
          } else {
            // A selector for an element in any namespace.
            if (// Use explicit "*|" only when it's not implied
                sheetNS->FindNameSpaceID(nsnull) != kNameSpaceID_None &&
                // :not() is special in that the default namespace is
                // not implied for non-type selectors
                (!aIsNegated || (!mIDList && !mClassList &&
                                 !mPseudoClassList && !mAttrList))) {
              aString.AppendLiteral("*|");
              wroteNamespace = PR_TRUE;
            }
          }
        }
      }
    }
  }
      
  if (!mTag) {
    // Universal selector:  avoid writing the universal selector when we
    // can avoid it, especially since we're required to avoid it for the
    // inside of :not()
    if (wroteNamespace ||
        (!mIDList && !mClassList && !mPseudoClassList && !mAttrList &&
         (aIsNegated || !mNegations))) {
      aString.Append(PRUnichar('*'));
    }
  } else {
    // Append the tag name
    if (isPseudoElement) {
      if (!mNext) {
        // Lone pseudo-element selector -- toss in a wildcard type selector
        // XXXldb Why?
        aString.Append(PRUnichar('*'));
      }
      if (!nsCSSPseudoElements::IsCSS2PseudoElement(mTag)) {
        aString.Append(PRUnichar(':'));
      }
    }
    nsAutoString prefix;
    mTag->ToString(prefix);
    aString.Append(prefix);
  }

  // Append the id, if there is one
  if (mIDList) {
    nsAtomList* list = mIDList;
    while (list != nsnull) {
      list->mAtom->ToString(temp);
//.........这里部分代码省略.........

nsresult nsMsgI18NConvertToUnicode(const char* aCharset,
                                   const nsCString& inString, 
                                   nsAString& outString,
                                   bool aIsCharsetCanonical)
{
  if (inString.IsEmpty()) {
    outString.Truncate();
    return NS_OK;
  }
  else if (!*aCharset || !PL_strcasecmp(aCharset, "us-ascii") ||
           !PL_strcasecmp(aCharset, "ISO-8859-1")) {
    // Despite its name, it also works for Latin-1.
    CopyASCIItoUTF16(inString, outString);
    return NS_OK;
  }
  else if (!PL_strcasecmp(aCharset, "UTF-8")) {
    if (MsgIsUTF8(inString)) {
      nsAutoString tmp;
      CopyUTF8toUTF16(inString, tmp);
      if (!tmp.IsEmpty() && tmp.get()[0] == char16_t(0xFEFF))
        tmp.Cut(0, 1);
      outString.Assign(tmp);
      return NS_OK;
    }
    NS_WARNING("Invalid UTF-8 string");
    return NS_ERROR_UNEXPECTED;
  }

  nsresult rv;
  nsCOMPtr <nsICharsetConverterManager> ccm = do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr <nsIUnicodeDecoder> decoder;

  // get an unicode converter
  if (aIsCharsetCanonical)  // optimize for modified UTF-7 used by IMAP
    rv = ccm->GetUnicodeDecoderRaw(aCharset, getter_AddRefs(decoder));
  else
    rv = ccm->GetUnicodeDecoderInternal(aCharset, getter_AddRefs(decoder));
  NS_ENSURE_SUCCESS(rv, rv);

  const char *originalSrcPtr = inString.get();
  const char *currentSrcPtr = originalSrcPtr;
  int32_t originalLength = inString.Length();
  int32_t srcLength;
  int32_t dstLength;
  char16_t localbuf[512];
  int32_t consumedLen = 0;

  outString.Truncate();

  // convert
  while (consumedLen < originalLength) {
    srcLength = originalLength - consumedLen;  
    dstLength = 512;
    rv = decoder->Convert(currentSrcPtr, &srcLength, localbuf, &dstLength);
    if (NS_FAILED(rv) || dstLength == 0)
      break;
    outString.Append(localbuf, dstLength);

    currentSrcPtr += srcLength;
    consumedLen = currentSrcPtr - originalSrcPtr; // src length used so far
  }
  return rv;
}

void 
nsXMLContentSerializer::AppendToString(const PRUnichar aChar,
                                       nsAString& aOutputStr)
{
  aOutputStr.Append(aChar);
}

NS_IMETHODIMP
nsDOMFile::GetAsDataURL(nsAString &aResult)
{
    aResult.AssignLiteral("data:");

    nsresult rv;
    if (!mContentType.Length()) {
        nsCOMPtr<nsIMIMEService> mimeService =
            do_GetService(NS_MIMESERVICE_CONTRACTID, &rv);
        NS_ENSURE_SUCCESS(rv, rv);

        nsCAutoString contentType;
        rv = mimeService->GetTypeFromFile(mFile, contentType);
        if (NS_SUCCEEDED(rv)) {
            CopyUTF8toUTF16(contentType, mContentType);
        }
    }

    if (mContentType.Length()) {
        aResult.Append(mContentType);
    } else {
        aResult.AppendLiteral("application/octet-stream");
    }
    aResult.AppendLiteral(";base64,");

    nsCOMPtr<nsIInputStream> stream;
    rv = GetInternalStream(getter_AddRefs(stream));
    NS_ENSURE_SUCCESS(rv, DOMFileResult(rv));

    char readBuf[4096];
    PRUint32 leftOver = 0;
    PRUint32 numRead;
    do {
        rv = stream->Read(readBuf + leftOver, sizeof(readBuf) - leftOver, &numRead);
        NS_ENSURE_SUCCESS(rv, DOMFileResult(rv));

        PRUint32 numEncode = numRead + leftOver;
        leftOver = 0;

        if (numEncode == 0) break;

        // unless this is the end of the file, encode in multiples of 3
        if (numRead > 0) {
            leftOver = numEncode % 3;
            numEncode -= leftOver;
        }

        // out buffer should be at least 4/3rds the read buf, plus a terminator
        char *base64 = PL_Base64Encode(readBuf, numEncode, nsnull);
        if (!base64) {
            return DOMFileResult(NS_ERROR_OUT_OF_MEMORY);
        }
        nsDependentCString str(base64);
        PRUint32 strLen = str.Length();
        PRUint32 oldLength = aResult.Length();
        AppendASCIItoUTF16(str, aResult);
        PR_Free(base64);
        if (aResult.Length() - oldLength != strLen) {
            return DOMFileResult(NS_ERROR_OUT_OF_MEMORY);
        }

        if (leftOver) {
            memmove(readBuf, readBuf + numEncode, leftOver);
        }
    } while (numRead > 0);

    return NS_OK;
}

// performs a locale sensitive date formatting operation on the struct tm parameter
nsresult nsDateTimeFormatWin::FormatTMTime(nsILocale* locale, 
                                           const nsDateFormatSelector  dateFormatSelector, 
                                           const nsTimeFormatSelector timeFormatSelector, 
                                           const struct tm*  tmTime, 
                                           nsAString& stringOut)
{
  SYSTEMTIME system_time;
  DWORD dwFlags_Date = 0, dwFlags_Time = 0;
  int dateLen, timeLen;
  PRUnichar dateBuffer[NSDATETIMEFORMAT_BUFFER_LEN], timeBuffer[NSDATETIMEFORMAT_BUFFER_LEN];

  // set up locale data
  (void) Initialize(locale);

  // Map tm to SYSTEMTIME
  system_time.wYear = 1900 + tmTime->tm_year;
  system_time.wMonth = tmTime->tm_mon + 1;
  system_time.wDayOfWeek = tmTime->tm_wday;
  system_time.wDay = tmTime->tm_mday;
  system_time.wHour = tmTime->tm_hour;
  system_time.wMinute = tmTime->tm_min;
  system_time.wSecond = tmTime->tm_sec;
  system_time.wMilliseconds = 0;

  // Map to WinAPI date format
  switch (dateFormatSelector) {
  case kDateFormatLong:
    dwFlags_Date = DATE_LONGDATE;
    break;
  case kDateFormatShort:
    dwFlags_Date = DATE_SHORTDATE;
    break;
  case kDateFormatWeekday:
    dwFlags_Date = 0;
    break;
  case kDateFormatYearMonth:
    dwFlags_Date = 0;     // TODO:only availabe NT5
    break;
  }

  // Map to WinAPI time format
  switch (timeFormatSelector) {
  case kTimeFormatSeconds:
    dwFlags_Time = 0;
    break;
  case kTimeFormatNoSeconds:
    dwFlags_Time = TIME_NOSECONDS;
    break;
  case kTimeFormatSecondsForce24Hour:
    dwFlags_Time = TIME_FORCE24HOURFORMAT;
    break;
  case kTimeFormatNoSecondsForce24Hour:
    dwFlags_Time = TIME_NOSECONDS + TIME_FORCE24HOURFORMAT;
    break;
  }

  // Call GetDateFormatW
  if (dateFormatSelector == kDateFormatNone) {
    dateLen = 0;
  }
  else {
    if (dateFormatSelector == kDateFormatYearMonth) {
      dateLen = nsGetDateFormatW(0, &system_time, "yyyy/MM", 
                                 dateBuffer, NSDATETIMEFORMAT_BUFFER_LEN);
    }
    else if (dateFormatSelector == kDateFormatWeekday) {
      dateLen = nsGetDateFormatW(0, &system_time, "ddd", 
                                 dateBuffer, NSDATETIMEFORMAT_BUFFER_LEN);
    }
    else {
      dateLen = nsGetDateFormatW(dwFlags_Date, &system_time, NULL, 
                                 dateBuffer, NSDATETIMEFORMAT_BUFFER_LEN);
    }
    if (dateLen != 0) {
      dateLen--;  // Since the count includes the terminating null.
    }
  }

  // Call GetTimeFormatW
  if (timeFormatSelector == kTimeFormatNone) {
    timeLen = 0;
  }
  else {
    timeLen = nsGetTimeFormatW(dwFlags_Time, &system_time, NULL, 
                               timeBuffer, NSDATETIMEFORMAT_BUFFER_LEN);
    if (timeLen != 0) {
      timeLen--;  // Since the count includes the terminating null.
    }
  }

  NS_ASSERTION(NSDATETIMEFORMAT_BUFFER_LEN >= (uint32_t) (dateLen + 1), "internal date buffer is not large enough");
  NS_ASSERTION(NSDATETIMEFORMAT_BUFFER_LEN >= (uint32_t) (timeLen + 1), "internal time buffer is not large enough");

  // Copy the result
  stringOut.Truncate();
  if (dateLen != 0 && timeLen != 0) {
    stringOut.Assign(dateBuffer, dateLen);
    stringOut.Append((PRUnichar *)(L" "), 1);
    stringOut.Append(timeBuffer, timeLen);
//.........这里部分代码省略.........

/*
 * Converts the value of the given double to a String, and places
 * The result into the destination String.
 * @return the given dest string
 */
void Double::toString(double aValue, nsAString& aDest)
{

    // check for special cases

    if (isNaN(aValue)) {
        aDest.AppendLiteral("NaN");
        return;
    }
    if (isInfinite(aValue)) {
        if (aValue < 0)
            aDest.Append(PRUnichar('-'));
        aDest.AppendLiteral("Infinity");
        return;
    }

    // Mantissa length is 17, so this is plenty
    const int buflen = 20;
    char buf[buflen];

    PRIntn intDigits, sign;
    char* endp;
    PR_dtoa(aValue, 0, 0, &intDigits, &sign, &endp, buf, buflen - 1);

    // compute length
    PRInt32 length = endp - buf;
    if (length > intDigits) {
        // decimal point needed
        ++length;
        if (intDigits < 1) {
            // leading zeros, -intDigits + 1
            length += 1 - intDigits;
        }
    }
    else {
        // trailing zeros, total length given by intDigits
        length = intDigits;
    }
    if (aValue < 0)
        ++length;
    // grow the string
    PRUint32 oldlength = aDest.Length();
    if (!EnsureStringLength(aDest, oldlength + length))
        return; // out of memory
    nsAString::iterator dest;
    aDest.BeginWriting(dest).advance(PRInt32(oldlength));
    if (aValue < 0) {
        *dest = '-'; ++dest;
    }
    int i;
    // leading zeros
    if (intDigits < 1) {
        *dest = '0'; ++dest;
        *dest = '.'; ++dest;
        for (i = 0; i > intDigits; --i) {
            *dest = '0'; ++dest;
        }
    }
    // mantissa
    int firstlen = PR_MIN(intDigits, endp - buf);
    for (i = 0; i < firstlen; i++) {
        *dest = buf[i]; ++dest;
    }
    if (i < endp - buf) {
        if (i > 0) {
            *dest = '.'; ++dest;
        }
        for (; i < endp - buf; i++) {
            *dest = buf[i]; ++dest;
        }
    }
    // trailing zeros
    for (; i < intDigits; i++) {
        *dest = '0'; ++dest;
    }
}