C++ nsCString::BeginReading方法代码示例

static void
rdf_EscapeAmpersandsAndAngleBrackets(nsCString& s)
{
    uint32_t newLength, origLength;
    newLength = origLength = s.Length();

    // Compute the length of the result string.
    const char* start = s.BeginReading();
    const char* end = s.EndReading();
    const char* c = start;
    while (c != end) {
        switch (*c) {
        case '&' :
            newLength += sizeof(amp) - 2;
            break;
        case '<':
        case '>':
            newLength += sizeof(gt) - 2;
            break;
        default:
            break;
        }
        ++c;
    }
    if (newLength == origLength) {
        // nothing to escape
        return;
    }

    // escape the chars from the end back to the front.
    s.SetLength(newLength);

    // Buffer might have changed, get the pointers again
    start = s.BeginReading(); // begin of string
    c = start + origLength - 1; // last char in original string
    char* w = s.EndWriting() - 1; // last char in grown buffer
    while (c >= start) {
        switch (*c) {
        case '&' :
            w -= 4;
            nsCharTraits<char>::copy(w, amp, sizeof(amp) - 1);
            break;
        case '<':
            w -= 3;
            nsCharTraits<char>::copy(w, lt, sizeof(lt) - 1);
            break;
        case '>':
            w -= 3;
            nsCharTraits<char>::copy(w, gt, sizeof(gt) - 1);
            break;
        default:
            *w = *c;
        }
        --w;
        --c;
    }
}

nsresult nsDOMOfflineResourceList::GetCacheKey(nsIURI* aURI, nsCString& aKey) {
  nsresult rv = aURI->GetAsciiSpec(aKey);
  NS_ENSURE_SUCCESS(rv, rv);

  // url fragments aren't used in cache keys
  nsAutoCString::const_iterator specStart, specEnd;
  aKey.BeginReading(specStart);
  aKey.EndReading(specEnd);
  if (FindCharInReadable('#', specStart, specEnd)) {
    aKey.BeginReading(specEnd);
    aKey = Substring(specEnd, specStart);
  }

  return NS_OK;
}

void nsMsgI18NConvertRawBytesToUTF16(const nsCString& inString, 
                                     const char* charset,
                                     nsAString& outString)
{
  if (MsgIsUTF8(inString))
  {
    CopyUTF8toUTF16(inString, outString);
    return;
  }

  nsresult rv = ConvertToUnicode(charset, inString, outString);
  if (NS_SUCCEEDED(rv))
    return;

  const char* cur = inString.BeginReading();
  const char* end = inString.EndReading();
  outString.Truncate();
  while (cur < end) {
    char c = *cur++;
    if (c & char(0x80))
      outString.Append(UCS2_REPLACEMENT_CHAR);
    else
      outString.Append(c);
  }
}

nsresult UDPSocketParent::ConnectInternal(const nsCString& aHost,
                                          const uint16_t& aPort) {
  nsresult rv;

  UDPSOCKET_LOG(("%s: %s:%u", __FUNCTION__, nsCString(aHost).get(), aPort));

  if (!mSocket) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  PRNetAddr prAddr;
  memset(&prAddr, 0, sizeof(prAddr));
  PR_InitializeNetAddr(PR_IpAddrAny, aPort, &prAddr);
  PRStatus status = PR_StringToNetAddr(aHost.BeginReading(), &prAddr);
  if (status != PR_SUCCESS) {
    return NS_ERROR_FAILURE;
  }

  mozilla::net::NetAddr addr;
  PRNetAddrToNetAddr(&prAddr, &addr);

  rv = mSocket->Connect(&addr);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  return NS_OK;
}

/**
 * Check if the host name starts with ftp\d*\. and it's not directly followed
 * by the tld.
 */
bool nsDefaultURIFixup::IsLikelyFTP(const nsCString &aHostSpec)
{
    bool likelyFTP = false;
    if (aHostSpec.EqualsIgnoreCase("ftp", 3)) {
        nsACString::const_iterator iter;
        nsACString::const_iterator end;
        aHostSpec.BeginReading(iter);
        aHostSpec.EndReading(end);
        iter.advance(3); // move past the "ftp" part

        while (iter != end)
        {
            if (*iter == '.') {
                // now make sure the name has at least one more dot in it
                ++iter;
                while (iter != end)
                {
                    if (*iter == '.') {
                        likelyFTP = true;
                        break;
                    }
                    ++iter;
                }
                break;
            }
            else if (!nsCRT::IsAsciiDigit(*iter)) {
                break;
            }
            ++iter;
        }
    }
    return likelyFTP;
}

void nsMsgI18NConvertRawBytesToUTF8(const nsCString& inString, 
                                    const char* charset,
                                    nsACString& outString)
{
  if (MsgIsUTF8(inString))
  {
    outString.Assign(inString);
    return;
  }

  nsAutoString utf16Text;
  nsresult rv = ConvertToUnicode(charset, inString, utf16Text);
  if (NS_SUCCEEDED(rv))
  {
    CopyUTF16toUTF8(utf16Text, outString);
    return;
  }

  // EF BF BD (UTF-8 encoding of U+FFFD)
  NS_NAMED_LITERAL_CSTRING(utf8ReplacementChar, "\357\277\275");
  const char* cur = inString.BeginReading();
  const char* end = inString.EndReading();
  outString.Truncate();
  while (cur < end) {
    char c = *cur++;
    if (c & char(0x80))
      outString.Append(utf8ReplacementChar);
    else
      outString.Append(c);
  }
}

static void
MorkUnescape(const nsCSubstring &aString, nsCString &aResult)
{
    PRUint32 len = aString.Length();

    // We optimize for speed over space here -- size the result buffer to
    // the size of the source, which is an upper bound on the size of the
    // unescaped string.
    // FIXME: Mork assume there will never be errors
    if (!EnsureStringLength(aResult, len)) {
        aResult.Truncate();
        return; // out of memory.
    }

    char *result = aResult.BeginWriting();
    const char *source = aString.BeginReading();
    const char *sourceEnd = source + len;

    const char *startPos = nsnull;
    PRUint32 bytes;
    for (; source < sourceEnd; ++source) {
        char c = *source;
        if (c == '\\') {
            if (startPos) {
                bytes = source - startPos;
                memcpy(result, startPos, bytes);
                result += bytes;
                startPos = nsnull;
            }
            if (source < sourceEnd - 1) {
                *(result++) = *(++source);
            }
        } else if (c == '$') {
            if (startPos) {
                bytes = source - startPos;
                memcpy(result, startPos, bytes);
                result += bytes;
                startPos = nsnull;
            }
            if (source < sourceEnd - 2) {
                // Would be nice to use ToInteger() here, but it currently
                // requires a null-terminated string.
                char c2 = *(++source);
                char c3 = *(++source);
                if (ConvertChar(&c2) && ConvertChar(&c3)) {
                    *(result++) = ((c2 << 4) | c3);
                }
            }
        } else if (!startPos) {
            startPos = source;
        }
    }
    if (startPos) {
        bytes = source - startPos;
        memcpy(result, startPos, bytes);
        result += bytes;
    }
    aResult.SetLength(result - aResult.BeginReading());
}

static void ReplaceChar(nsCString& str, const nsACString& character,
                        const nsACString& replacement)
{
  nsCString::const_iterator start, end;

  str.BeginReading(start);
  str.EndReading(end);

  while (FindInReadable(character, start, end)) {
    PRInt32 pos = end.size_backward();
    str.Replace(pos - 1, 1, replacement);

    str.BeginReading(start);
    start.advance(pos + replacement.Length() - 1);
    str.EndReading(end);
  }
}

nsMediaFragmentURIParser::nsMediaFragmentURIParser(const nsCString& aSpec)
{
  nsReadingIterator<char> start, end;
  aSpec.BeginReading(start);
  aSpec.EndReading(end);
  if (FindCharInReadable('#', start, end)) {
    mHash = Substring(++start, end);
  }
}

bool
GMPChild::RecvSetNodeId(const nsCString& aNodeId)
{
  // Store the per origin salt for the node id. Note: we do this in a
  // separate message than RecvStartPlugin() so that the string is not
  // sitting in a string on the IPC code's call stack.
  mNodeId = std::string(aNodeId.BeginReading(), aNodeId.EndReading());
  return true;
}

bool
UDPSocketParent::Init(const nsCString &aHost, const uint16_t aPort)
{
  nsresult rv;
  NS_ASSERTION(mFilter, "No packet filter");

  nsCOMPtr<nsIUDPSocket> sock =
      do_CreateInstance("@mozilla.org/network/udp-socket;1", &rv);
  if (NS_FAILED(rv)) {
    FireInternalError(this, __LINE__);
    return true;
  }

  if (aHost.IsEmpty()) {
    rv = sock->Init(aPort, false);
  } else {
    PRNetAddr prAddr;
    PR_InitializeNetAddr(PR_IpAddrAny, aPort, &prAddr);
    PRStatus status = PR_StringToNetAddr(aHost.BeginReading(), &prAddr);
    if (status != PR_SUCCESS) {
      FireInternalError(this, __LINE__);
      return true;
    }

    mozilla::net::NetAddr addr;
    PRNetAddrToNetAddr(&prAddr, &addr);
    rv = sock->InitWithAddress(&addr);
  }

  if (NS_FAILED(rv)) {
    FireInternalError(this, __LINE__);
    return true;
  }

  mSocket = sock;

  net::NetAddr localAddr;
  mSocket->GetAddress(&localAddr);

  uint16_t port;
  nsCString addr;
  rv = ConvertNetAddrToString(localAddr, &addr, &port);

  if (NS_FAILED(rv)) {
    FireInternalError(this, __LINE__);
    return true;
  }

  // register listener
  mSocket->AsyncListen(this);
  mozilla::unused <<
      PUDPSocketParent::SendCallback(NS_LITERAL_CSTRING("onopen"),
                                     UDPAddressInfo(addr, port),
                                     NS_LITERAL_CSTRING("connected"));

  return true;
}

void
WebGLShader::BindAttribLocation(GLuint prog, const nsCString& userName,
                                GLuint index) const
{
    std::string userNameStr(userName.BeginReading());

    const std::string* mappedNameStr = &userNameStr;
    if (mValidator)
        mValidator->FindAttribMappedNameByUserName(userNameStr, &mappedNameStr);

    mContext->gl->fBindAttribLocation(prog, index, mappedNameStr->c_str());
}

nsresult
UDPSocketParent::BindInternal(const nsCString& aHost, const uint16_t& aPort,
                              const bool& aAddressReuse, const bool& aLoopback)
{
  nsresult rv;

  UDPSOCKET_LOG(("%s: %s:%u", __FUNCTION__, nsCString(aHost).get(), aPort));

  nsCOMPtr<nsIUDPSocket> sock =
      do_CreateInstance("@mozilla.org/network/udp-socket;1", &rv);

  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (aHost.IsEmpty()) {
    rv = sock->Init(aPort, false, mPrincipal, aAddressReuse,
                    /* optional_argc = */ 1);
  } else {
    PRNetAddr prAddr;
    PR_InitializeNetAddr(PR_IpAddrAny, aPort, &prAddr);
    PRStatus status = PR_StringToNetAddr(aHost.BeginReading(), &prAddr);
    if (status != PR_SUCCESS) {
      return NS_ERROR_FAILURE;
    }

    mozilla::net::NetAddr addr;
    PRNetAddrToNetAddr(&prAddr, &addr);
    rv = sock->InitWithAddress(&addr, mPrincipal, aAddressReuse,
                               /* optional_argc = */ 1);
  }

  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  rv = sock->SetMulticastLoopback(aLoopback);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  // register listener
  rv = sock->AsyncListen(this);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  mSocket = sock;

  return NS_OK;
}

bool
NeckoParent::RecvRemoveRequestContext(const nsCString& rcid)
{
  nsCOMPtr<nsIRequestContextService> rcsvc =
    do_GetService("@mozilla.org/network/request-context-service;1");
  if (!rcsvc) {
    return true;
  }

  nsID id;
  id.Parse(rcid.BeginReading());
  rcsvc->RemoveRequestContext(id);

  return true;
}

bool
NeckoParent::RecvRemoveSchedulingContext(const nsCString& scid)
{
  nsCOMPtr<nsISchedulingContextService> scsvc =
    do_GetService("@mozilla.org/network/scheduling-context-service;1");
  if (!scsvc) {
    return true;
  }

  nsID id;
  id.Parse(scid.BeginReading());
  scsvc->RemoveSchedulingContext(id);

  return true;
}