C++ AString类代码示例

void ARTSPConnection::onSendRequest(const sp<AMessage> &msg) {
    sp<AMessage> reply;
    CHECK(msg->findMessage("reply", &reply));

    if (mState != CONNECTED) {
        reply->setInt32("result", -ENOTCONN);
        reply->post();
        return;
    }

    AString request;
    CHECK(msg->findString("request", &request));

    // Just in case we need to re-issue the request with proper authentication
    // later, stash it away.
    reply->setString("original-request", request.c_str(), request.size());

    addAuthentication(&request);
    addUserAgent(&request);

    // Find the boundary between headers and the body.
    ssize_t i = request.find("\r\n\r\n");
    CHECK_GE(i, 0);

    int32_t cseq = mNextCSeq++;

    AString cseqHeader = "CSeq: ";
    cseqHeader.append(cseq);
    cseqHeader.append("\r\n");

    request.insert(cseqHeader, i + 2);

    LOGV("request: '%s'", request.c_str());

    size_t numBytesSent = 0;
    while (numBytesSent < request.size()) {
        ssize_t n =
            send(mSocket, request.c_str() + numBytesSent,
                 request.size() - numBytesSent, 0);

        if (n < 0 && errno == EINTR) {
            continue;
        }

        if (n <= 0) {
            performDisconnect();

            if (n == 0) {
                // Server closed the connection.
                LOGE("Server unexpectedly closed the connection.");

                reply->setInt32("result", ERROR_IO);
                reply->post();
            } else {
                LOGE("Error sending rtsp request. (%s)", strerror(errno));
                reply->setInt32("result", -errno);
                reply->post();
            }

            return;
        }

        numBytesSent += (size_t)n;
    }

    mPendingRequests.add(cseq, reply);
}

bool ARTSPConnection::receiveRTSPReponse() {
    AString statusLine;

    if (!receiveLine(&statusLine)) {
        return false;
    }

    if (statusLine == "$") {
        sp<ABuffer> buffer = receiveBinaryData();

        if (buffer == NULL) {
            return false;
        }

        if (mObserveBinaryMessage != NULL) {
            sp<AMessage> notify = mObserveBinaryMessage->dup();
            notify->setObject("buffer", buffer);
            notify->post();
        } else {
            LOGW("received binary data, but no one cares.");
        }

        return true;
    }

    sp<ARTSPResponse> response = new ARTSPResponse;
    response->mStatusLine = statusLine;

    LOGI("status: %s", response->mStatusLine.c_str());

    ssize_t space1 = response->mStatusLine.find(" ");
    if (space1 < 0) {
        return false;
    }
    ssize_t space2 = response->mStatusLine.find(" ", space1 + 1);
    if (space2 < 0) {
        return false;
    }

    bool isRequest = false;

    if (!IsRTSPVersion(AString(response->mStatusLine, 0, space1))) {
        CHECK(IsRTSPVersion(
                    AString(
                        response->mStatusLine,
                        space2 + 1,
                        response->mStatusLine.size() - space2 - 1)));

        isRequest = true;

        response->mStatusCode = 0;
    } else {
        AString statusCodeStr(
                response->mStatusLine, space1 + 1, space2 - space1 - 1);

        if (!ParseSingleUnsignedLong(
                    statusCodeStr.c_str(), &response->mStatusCode)
                || response->mStatusCode < 100 || response->mStatusCode > 999) {
            return false;
        }
    }

    AString line;
    ssize_t lastDictIndex = -1;
    for (;;) {
        if (!receiveLine(&line)) {
            break;
        }

        if (line.empty()) {
            break;
        }

        LOGV("line: '%s'", line.c_str());

        if (line.c_str()[0] == ' ' || line.c_str()[0] == '\t') {
            // Support for folded header values.

            if (lastDictIndex < 0) {
                // First line cannot be a continuation of the previous one.
                return false;
            }

            AString &value = response->mHeaders.editValueAt(lastDictIndex);
            value.append(line);

            continue;
        }

        ssize_t colonPos = line.find(":");
        if (colonPos < 0) {
            // Malformed header line.
            return false;
        }

        AString key(line, 0, colonPos);
        key.trim();
        key.tolower();

        line.erase(0, colonPos + 1);
//.........这里部分代码省略.........

	virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
	{
		LOGD("Error while connecting HTTP: %d (%s)", a_ErrorCode, a_ErrorMsg.c_str());
		m_Event.Set();
	}

void ARTSPConnection::onConnect(const sp<AMessage> &msg) {
    ++mConnectionID;

    if (mState != DISCONNECTED) {
        if (mUIDValid) {
            HTTPBase::UnRegisterSocketUserTag(mSocket);
        }
        close(mSocket);
        mSocket = -1;

        flushPendingRequests();
    }

    mState = CONNECTING;

    AString url;
    CHECK(msg->findString("url", &url));

    sp<AMessage> reply;
    CHECK(msg->findMessage("reply", &reply));

    AString host, path;
    unsigned port;
    if (!ParseURL(url.c_str(), &host, &port, &path, &mUser, &mPass)
            || (mUser.size() > 0 && mPass.size() == 0)) {
        // If we have a user name but no password we have to give up
        // right here, since we currently have no way of asking the user
        // for this information.

        LOGE("Malformed rtsp url %s", url.c_str());

        reply->setInt32("result", ERROR_MALFORMED);
        reply->post();

        mState = DISCONNECTED;
        return;
    }

    if (mUser.size() > 0) {
        LOGV("user = '%s', pass = '%s'", mUser.c_str(), mPass.c_str());
    }

    struct hostent *ent = gethostbyname(host.c_str());
    if (ent == NULL) {
        LOGE("Unknown host %s", host.c_str());

        reply->setInt32("result", -ENOENT);
        reply->post();

        mState = DISCONNECTED;
        return;
    }

    mSocket = socket(AF_INET, SOCK_STREAM, 0);

    if (mUIDValid) {
        HTTPBase::RegisterSocketUserTag(mSocket, mUID,
                                        (uint32_t)*(uint32_t*) "RTSP");
    }

    MakeSocketBlocking(mSocket, false);

    union {
        struct sockaddr_in remote;
        struct sockaddr remote_generic;
    };
    memset(remote.sin_zero, 0, sizeof(remote.sin_zero));
    remote.sin_family = AF_INET;
    remote.sin_addr.s_addr = *(in_addr_t *)ent->h_addr;
    remote.sin_port = htons(port);

    int err = ::connect(
            mSocket, &remote_generic, sizeof(remote));

    reply->setInt32("server-ip", ntohl(remote.sin_addr.s_addr));

    if (err < 0) {
        if (errno == EINPROGRESS) {
            sp<AMessage> msg = new AMessage(kWhatCompleteConnection, id());
            msg->setMessage("reply", reply);
            msg->setInt32("connection-id", mConnectionID);
            msg->post();
            return;
        }

        reply->setInt32("result", -errno);
        mState = DISCONNECTED;

        if (mUIDValid) {
            HTTPBase::UnRegisterSocketUserTag(mSocket);
        }
        close(mSocket);
        mSocket = -1;
    } else {
        reply->setInt32("result", OK);
        mState = CONNECTED;
        mNextCSeq = 1;

        postReceiveReponseEvent();
    }
//.........这里部分代码省略.........

bool ASessionDescription::getDurationUs(int64_t *durationUs) const {
    *durationUs = 0;

    CHECK(mIsValid);

    AString value;
    if (!findAttribute(0, "a=range", &value)) {
        return false;
    }

#ifndef ANDROID_DEFAULT_CODE 
    if (strncmp(value.c_str(), "npt=", 4) && strncmp(value.c_str(), "npt:", 4)) {
#else
    if (strncmp(value.c_str(), "npt=", 4)) {
#endif // #ifndef ANDROID_DEFAULT_CODE
        return false;
    }

    float from, to;
    if (!parseNTPRange(value.c_str() + 4, &from, &to)) {
        return false;
    }

    *durationUs = (int64_t)((to - from) * 1E6);

    return true;
}

// static
void ASessionDescription::ParseFormatDesc(
        const char *desc, int32_t *timescale, int32_t *numChannels) {
    const char *slash1 = strchr(desc, '/');
    CHECK(slash1 != NULL);

    const char *s = slash1 + 1;
    char *end;
    unsigned long x = strtoul(s, &end, 10);
    CHECK_GT(end, s);
    CHECK(*end == '\0' || *end == '/');

    *timescale = x;
    *numChannels = 1;

    if (*end == '/') {
        s = end + 1;
        unsigned long x = strtoul(s, &end, 10);
        CHECK_GT(end, s);
        CHECK_EQ(*end, '\0');

        *numChannels = x;
    }
}

// static
bool ASessionDescription::parseNTPRange(
        const char *s, float *npt1, float *npt2) {
    if (s[0] == '-') {
        return false;  // no start time available.
    }

    if (!strncmp("now", s, 3)) {
        return false;  // no absolute start time available
    }

    char *end;
    *npt1 = strtof(s, &end);

    if (end == s || *end != '-') {
        // Failed to parse float or trailing "dash".
        return false;
    }

    s = end + 1;  // skip the dash.

    if (!strncmp("now", s, 3)) {
        return false;  // no absolute end time available
    }

    *npt2 = strtof(s, &end);
	
#ifndef ANDROID_DEFAULT_CODE
	//We support range string as "Range: npt=1.0000-"
	return true;
#else
	if (end == s || *end != '\0') {
		return false;
	}
	return *npt2 > *npt1;
#endif
}

#ifndef ANDROID_DEFAULT_CODE 
bool ASessionDescription::getBitrate(size_t index, int32_t* bitrate) const {
    char key[] = "b=AS";
    AString value;
    if (!findAttribute(index, key, &value))
        return false;
    int32_t b = atoi(value.c_str());
    b *= 1000;
    if (b < 0)
//.........这里部分代码省略.........

bool ASessionDescription::parse(const void *data, size_t size) {
    mTracks.clear();
    mFormats.clear();

    mTracks.push(Attribs());
    mFormats.push(AString("[root]"));

    AString desc((const char *)data, size);

#ifndef ANDROID_DEFAULT_CODE 
    int rtpmapNum = 0;
    bool unsupported = false;
#endif // #ifndef ANDROID_DEFAULT_CODE
    size_t i = 0;
    for (;;) {
#ifndef ANDROID_DEFAULT_CODE 
        if (i >= desc.size()) {
            break;
        }
#endif // #ifndef ANDROID_DEFAULT_CODE
        ssize_t eolPos = desc.find("\n", i);

        if (eolPos < 0) {
#ifndef ANDROID_DEFAULT_CODE 
            eolPos = desc.size();
#else
            break;
#endif // #ifndef ANDROID_DEFAULT_CODE
        }

        AString line;
        if ((size_t)eolPos > i && desc.c_str()[eolPos - 1] == '\r') {
            // We accept both '\n' and '\r\n' line endings, if it's
            // the latter, strip the '\r' as well.
            line.setTo(desc, i, eolPos - i - 1);
        } else {
            line.setTo(desc, i, eolPos - i);
        }

        if (line.empty()) {
            i = eolPos + 1;
            continue;
        }

        if (line.size() < 2 || line.c_str()[1] != '=') {
            return false;
        }

#ifndef ANDROID_DEFAULT_CODE 
        if (unsupported && line.c_str()[0] != 'm') {
            ALOGI("skip %s in unsupported media description", line.c_str());
            i = eolPos + 1;
            continue;
        } else
#endif // #ifndef ANDROID_DEFAULT_CODE
        ALOGI("%s", line.c_str());

        switch (line.c_str()[0]) {
            case 'v':
            {
                if (strcmp(line.c_str(), "v=0")) {
                    return false;
                }
                break;
            }

            case 'a':
            case 'b':
            {
                AString key, value;

                ssize_t colonPos = line.find(":", 2);
                if (colonPos < 0) {
                    key = line;
                } else {
                    key.setTo(line, 0, colonPos);

                    if (key == "a=fmtp" || key == "a=rtpmap"
                            || key == "a=framesize") {
                        ssize_t spacePos = line.find(" ", colonPos + 1);
                        if (spacePos < 0) {
                            return false;
                        }

#ifndef ANDROID_DEFAULT_CODE 
                        if (key == "a=rtpmap") {
                            if (rtpmapNum > 0) {
                                mTracks.pop();
                                mFormats.pop();
                                unsupported = true;
                                ALOGW("ASessionDescription: multiple rtpmap"
                                        " for one media is not supported yet");
                                break;
                            } else {
                                rtpmapNum++;
                            }
                        }
#endif // #ifndef ANDROID_DEFAULT_CODE
                        key.setTo(line, 0, spacePos);

//.........这里部分代码省略.........

bool ASessionDescription::getDimensions(
        size_t index, unsigned long PT,
        int32_t *width, int32_t *height) const {
    *width = 0;
    *height = 0;

    char key[20];
    sprintf(key, "a=framesize:%lu", PT);
    AString value;
    if (!findAttribute(index, key, &value)) {
#ifndef ANDROID_DEFAULT_CODE 
        // try to get dimensions from cliprect if no framesize
        strcpy(key, "a=cliprect");
        if (!findAttribute(index, key, &value)) {
            ALOGW("no framesize and cliprect, try Width/Height");
            strcpy(key, "a=Width");
            if (!findAttribute(index, key, &value)) {
                return false;
            }
            int w = parseString(value.c_str());

            strcpy(key, "a=Height");
            if (!findAttribute(index, key, &value)) {
                return false;
            }
            int h = parseString(value.c_str());

            if (w > 0 && h > 0) {
                *width = w;
                *height = h;
                return true;
            }
            return false;
        }

        const char *s = value.c_str();
        int a = -1, b = -1, c = -1, d = -1;
        sscanf(s, "%d,%d,%d,%d", &a, &b, &c, &d);
        if (a == -1 || b == -1 || c == -1 || d == -1)
            return false;
        *height = c - a;
        *width = d - b;
        return true;
#else
        return false;
#endif // #ifndef ANDROID_DEFAULT_CODE
    }

    const char *s = value.c_str();
    char *end;
    *width = strtoul(s, &end, 10);
    CHECK_GT(end, s);
    CHECK_EQ(*end, '-');

    s = end + 1;
    *height = strtoul(s, &end, 10);
    CHECK_GT(end, s);
    CHECK_EQ(*end, '\0');

    return true;
}

// StoreVariableToVariable
//------------------------------------------------------------------------------
bool BFFParser::StoreVariableToVariable( const AString & dstName, BFFIterator & varNameSrcStart, const BFFIterator & operatorIter, BFFStackFrame * dstFrame )
{
	AStackString< MAX_VARIABLE_NAME_LENGTH > srcName;

	bool srcParentScope = false;
	if ( ParseVariableName( varNameSrcStart, srcName, srcParentScope ) == false )
	{
		return false;
	}

	// find src var
	const BFFVariable * varSrc = nullptr;
	BFFStackFrame * const srcFrame = ( srcParentScope )
		? BFFStackFrame::GetParentDeclaration( srcName, nullptr, varSrc )
		: nullptr;

	if ( !srcParentScope )
	{
		varSrc = BFFStackFrame::GetVar( srcName, nullptr );
	}

	if ( ( srcParentScope && nullptr == srcFrame ) || ( nullptr == varSrc ) )
    {
    	Error::Error_1009_UnknownVariable( varNameSrcStart, nullptr );
    	return false;
    }

	// find dst var
	const BFFVariable * varDst = BFFStackFrame::GetVar( dstName, dstFrame );

	const bool concat = ( *operatorIter == BFF_VARIABLE_CONCATENATION );

	// concatenation?
	if ( concat )
	{
		// can only concatenate to existing vars
		if ( varDst == nullptr )
		{
			Error::Error_1026_VariableNotFoundForConcatenation( operatorIter, dstName );
			return false;
		}
	}

	// if dst exists, types must match
	BFFVariable::VarType srcType = varSrc->GetType(); 
	BFFVariable::VarType dstType = BFFVariable::VAR_ANY; 
	if ( varDst )
	{
		dstType = varDst->GetType();
	}
	else 
	{
		ASSERT( concat == false );
		dstType = srcType;
	}

	// handle supported types

	if ( srcType != dstType )
	{
		// Mismatched - is there a supported conversion?

		// String to ArrayOfStrings
		if ( ( dstType == BFFVariable::VAR_ARRAY_OF_STRINGS ) && 
			 ( srcType == BFFVariable::VAR_STRING ) )
		{
			uint32_t num = (uint32_t)( 1 + ( concat ? varDst->GetArrayOfStrings().GetSize() : 0 ) );
			Array< AString > values( num, false );
			if ( concat )
			{
				values.Append( varDst->GetArrayOfStrings() );
			}
			values.Append( varSrc->GetString() );

			BFFStackFrame::SetVarArrayOfStrings( dstName, values, dstFrame );
			FLOG_INFO( "Registered <ArrayOfStrings> variable '%s' with %u elements", dstName.Get(), num );
			return true;
		}

		// Struct to ArrayOfStructs
		if ( ( dstType == BFFVariable::VAR_ARRAY_OF_STRUCTS ) && 
			 ( srcType == BFFVariable::VAR_STRUCT ) )
		{
			uint32_t num = (uint32_t)( 1 + ( concat ? varDst->GetArrayOfStructs().GetSize() : 0 ) );
			Array< const BFFVariable * > values( num, false );
			if ( concat )
			{
				values.Append( varDst->GetArrayOfStructs() );
			}
			values.Append( varSrc );

			BFFStackFrame::SetVarArrayOfStructs( dstName, values, dstFrame );
			FLOG_INFO( "Registered <ArrayOfStructs> variable '%s' with %u elements", dstName.Get(), num );
			return true;
		}

	}
	else
//.........这里部分代码省略.........

// StoreVariableArray
//------------------------------------------------------------------------------
bool BFFParser::StoreVariableArray( const AString & name,
									const BFFIterator & valueStart, const BFFIterator & valueEnd,
									const BFFIterator & operatorIter,
									BFFStackFrame * frame )
{
	Array< AString > values( 32, true );
	Array< const BFFVariable * > structValues( 32, true );

	// are we concatenating?
	if ( *operatorIter == BFF_VARIABLE_CONCATENATION )
	{
		// find existing
		const BFFVariable * var = BFFStackFrame::GetVar( name, frame );
		if ( var == nullptr )
		{
			Error::Error_1026_VariableNotFoundForConcatenation( operatorIter, name );
			return false;
		}

		// make sure existing is an array
		if ( var->IsArrayOfStrings() )
		{
			// get values to start with
			values = var->GetArrayOfStrings();
		}
		else if ( var->IsArrayOfStructs() )
		{
			// get values to start with
			structValues = var->GetArrayOfStructs();
		}
		else
		{
			// TODO:B Improve this error to handle ArrayOfStructs case
			Error::Error_1027_CannotConcatenate( operatorIter, name, var->GetType(), BFFVariable::VAR_ARRAY_OF_STRINGS );
			return false;
		}
	}

	// Parse array of variables
	BFFIterator iter( valueStart );
	for (;;)
	{
		iter.SkipWhiteSpaceAndComments();

		// end?
		if ( iter.GetCurrent() == valueEnd.GetCurrent() )
		{
			break;
		}

		const char c = *iter;
		if ( ( c == '"' ) || ( c == '\'' ) )
		{
			// a quoted string

			// detect mistmatches
			if ( structValues.IsEmpty() == false )
			{
				// Mixed types in vector
				Error::Error_1034_OperationNotSupported( iter, 
														 BFFVariable::VAR_ARRAY_OF_STRUCTS,
														 BFFVariable::VAR_STRING,
														 operatorIter );
				return false;
			}

			// a string
			BFFIterator elementValueStart( iter );
			iter.SkipString( c );
			ASSERT( iter.GetCurrent() <= valueEnd.GetCurrent() ); // should not be in this function if string is not terminated
			elementValueStart++; // move to start of actual content
			AStackString< 2048 > elementValue;

			// unescape and subsitute embedded variables
			if ( PerformVariableSubstitutions( elementValueStart, iter, elementValue ) == false )
			{
				return false;
			}

			values.Append( elementValue );

			iter++; // pass closing quote
		}
		else if ( c == BFF_DECLARE_VAR_INTERNAL ||
				  c == BFF_DECLARE_VAR_PARENT )
		{
			const BFFIterator elementStartValue = iter;

			// a variable
			AStackString< MAX_VARIABLE_NAME_LENGTH > varName;
			bool parentScope = false; // ignored, the behavior is the same
			if ( ParseVariableName( iter, varName, parentScope ) == false )
			{
				return false;
			}

			// get the variable
			const BFFVariable * var = BFFStackFrame::GetVar( varName, frame );
//.........这里部分代码省略.........

int cProtocol132::ParseItemMetadata(cItem & a_Item, const AString & a_Metadata)
{
	// Uncompress the GZIPped data:
	AString Uncompressed;
	if (UncompressStringGZIP(a_Metadata.data(), a_Metadata.size(), Uncompressed) != Z_OK)
	{
		AString HexDump;
		CreateHexDump(HexDump, a_Metadata.data(), a_Metadata.size(), 16);
		LOG("Cannot unGZIP item metadata:\n%s", HexDump.c_str());
		return PARSE_ERROR;
	}
	
	// Parse into NBT:
	cParsedNBT NBT(Uncompressed.data(), Uncompressed.size());
	if (!NBT.IsValid())
	{
		AString HexDump;
		CreateHexDump(HexDump, Uncompressed.data(), Uncompressed.size(), 16);
		LOG("Cannot parse NBT item metadata:\n%s", HexDump.c_str());
		return PARSE_ERROR;
	}
	
	// Load enchantments from the NBT:
	for (int tag = NBT.GetFirstChild(NBT.GetRoot()); tag >= 0; tag = NBT.GetNextSibling(tag))
	{
		if (
			(NBT.GetType(tag) == TAG_List) &&
			(
				(NBT.GetName(tag) == "ench") ||
				(NBT.GetName(tag) == "StoredEnchantments")
			)
		)
		{
			EnchantmentSerializer::ParseFromNBT(a_Item.m_Enchantments, NBT, tag);
		}
	}
	
	return PARSE_OK;
}

bool ARTSPConnection::receiveRTSPRequest() {
    AString requestLine;
	LOGI(LOG_TAG,"start receiveLine ......\n");
    if (!receiveLine(&requestLine)) {
        return false;
    }
//	LOGI(LOG_TAG,"receiveLine OK\n");
    sp<AMessage>  request = new AMessage(kWhatRequest,mhandlerID);
	request->setInt32("SessionID",mSessionID);
	LOGI(LOG_TAG,"request->setInt32 SessionID %d\n",mSessionID);
    LOGI(LOG_TAG,"request: %s\n", requestLine.c_str());

    ssize_t space1 = requestLine.find(" ");//寻找空格
    if (space1 < 0) {
        return false;
    }
    ssize_t space2 = requestLine.find(" ", space1 + 1);
    if (space2 < 0) {
        return false;
    }

    AString Method(requestLine.c_str(), space1);
	request->setString("Method",Method.c_str());
	AString URI(requestLine,space1+1,space2-space1-1);
	request->setString("URI",URI.c_str());
    AString line;
    for (;;) {
        if (!receiveLine(&line)) {
            break;
        }

        if (line.empty()) {
            break;
        }

        ssize_t colonPos = line.find(":");
        if (colonPos < 0) {
            // Malformed header line.
            return false;
        }

        AString key(line, 0, colonPos);
        key.trim();
       // key.tolower();

        line.erase(0, colonPos + 1);
        line.trim();
		
        LOGI(LOG_TAG,"line: %s:%s\n", key.c_str(),line.c_str());

	    request->setString(key.c_str(),line.c_str());	
    }
	LOGI(LOG_TAG,"Post the request to handler\n");
    request->post();//将请求消息发送给uplayer 处理
	return OK;
}