C++ trpgReadBuffer::PopLimit方法代码示例

bool trpgLightTable::Read(trpgReadBuffer &buf)
{
    int32        numLights;
    trpgToken    lightTok;
    int32        len;

    try {
        buf.Get(numLights);
        for (int i=0;i<numLights;i++) {
            buf.GetToken(lightTok,len);
            if (lightTok != TRPGLIGHTATTR) throw 1;
            buf.PushLimit(len);
            trpgLightAttr light;// = lightList[i];
            bool status = light.Read(buf);
            buf.PopLimit();
            if (!status) throw 1;
            AddLightAttr(light);
        }
    }
    catch (...) {
        return false;
    }

    return true;
}

bool trpgRangeTable::Read(trpgReadBuffer &buf)
{
	int32 numRange;
	trpgToken tok;
	int32 len;
	valid = false;

	try {
		buf.Get(numRange);
		if (numRange < 0) throw 1;
		for (int i=0;i<numRange;i++) {
			// Read in the individual range
			buf.GetToken(tok,len);
			if (tok != TRPG_RANGE) throw 1;
			buf.PushLimit(len);
			trpgRange range;
			bool status = range.Read(buf);
			buf.PopLimit();
			if (!status) throw 1;
			AddRange(range);
		}

		valid = true;
	}

	catch (...) {
		return false;
	}

	return isValid();
}

bool trpgSupportStyleTable::Read(trpgReadBuffer &buf)
{
    trpgSupportStyle style;
    trpgToken styleTok;
    int32 len;
    bool status;
    int numStyle;
    int i;

    Reset();

    try
    {
        buf.Get(numStyle);
        if (numStyle < 0)
            throw 1;
        //styles.resize(numStyle);
        for (i=0;i<numStyle;i++) {
            buf.GetToken(styleTok,len);
            if (styleTok != TRPG_SUPPORT_STYLE) throw 1;
            buf.PushLimit(len);
            style.Reset();
            status = style.Read(buf);
            buf.PopLimit();
            if (!status) throw 1;
            AddStyle(style);
        }
    }
    catch (...)
    {
        return false;
    }

    return isValid();
}

bool trpgMatTable::Read(trpgReadBuffer &buf)
{
	trpgMaterial mat;
	trpgToken matTok;
	int32 len;
	bool status;
	int i,j;
	int nMat,nTable;

	try {
		buf.Get(nTable);
		buf.Get(nMat);
		if (nTable <= 0 || nMat < 0) throw 1;
		// Read the materials
		for (i=0;i<nTable;i++)
			for (j=0;j<nMat;j++) {
				buf.GetToken(matTok,len);
				if (matTok != TRPGMATERIAL) throw 1;
				buf.PushLimit(len);
				mat.Reset();
				status = mat.Read(buf);
				buf.PopLimit();
				if (!status) throw 1;
				AddMaterial(mat,false);				
			}
			numTable += nTable;
			numMat = materialMap.size();
	}
	catch (...) {
		return false;
	}

	return isValid();
}

bool trpgModelTable::Read(trpgReadBuffer &buf)
{
    int32 numModel;
    trpgToken tok;
    int32 len;
    bool status;

    try {
        buf.Get(numModel);
        for (int i=0;i<numModel;i++) {
            trpgModel model;
            buf.GetToken(tok,len);
            bool readHandle;
            if (tok == TRPGMODELREF)
                readHandle = false;
            else if (tok == TRPGMODELREF2)
                readHandle = true;
            else
                throw 1;
            buf.PushLimit(len);
            status = model.Read(buf,readHandle);
            buf.PopLimit();
            if (!status)  throw 1;
            AddModel(model);
        }
    }
    catch (...) {
        return false;
    }

    return isValid();
}

/* Parse Buffer
   This runs through the given buffer parsing token sets until
   it (1) runs out of buffer or (2) fails.
   Note: Good place to return an exception, but keep it simple for now.
*/
bool trpgr_Parser::Parse(trpgReadBuffer &buf)
{
    bool ret = true;

    try
    {
        while (!buf.isEmpty())
        {
            /* We're expecting the following
            Token    (int32)
            Length  (int32)
            Data    (variable)
            */
            trpgToken tok;
            int32 len;
            if (!buf.Get(tok))  throw 1;
            // Push and Pop are special - no data
            if (tok != TRPG_PUSH && tok != TRPG_POP)
            {
                if (!buf.Get(len)) throw 1;
                if (!TokenIsValid(tok))  throw 1;
                if (len < 0)  throw 1;
                // Limit what we're reading to the length of this
                buf.PushLimit(len);
            }

            // Call our token handler for this one
            try
            {
                const trpgr_Token *tcb = NULL;
                tok_map::const_iterator p = tokenMap.find(tok);
                if (p != tokenMap.end())
                    tcb = &(*p).second;
                if (!tcb)
                    // No such token, call the default
                    tcb = &defCb;

                // Run the callback
                if (tcb->cb)
                {
                    void *ret = tcb->cb->Parse(tok,buf);
                    // Note: Do something with the return value
                    lastObject = ret;
                }
            }
            catch (...)
            {
                // Don't want to screw up the limit stack
            }
            // No limit to worry about with push and pop
            if (tok != TRPG_PUSH && tok != TRPG_POP)
            {
                buf.SkipToLimit();
                buf.PopLimit();
            }
        }
    }
    catch (...)
    {
        // Failed to parse.
        ret = false;
    }

    return ret;
}