Let me give you some background:
I am writing a driver that sends JPEGs and XML files to the hardware. One of the routines of the driver receives chunks of data (64 k) . The job of this routine is to save this data until it receives a complete JPEG or an XML, and then send it across to the HW.
The problem that I face is sharing the data across the different states. I have a single buffer that is shared across all the states. Moreover other information like size of the JPEGs and XMLs need to be saved across the states.
I am attaching the code for ur refernce:
Code:
class start_state : public State
{
public:
HPBool ProcessData(Machine *pMachine, HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten);
void setNextState(State *pState);
private:
int ExtractLength(HPCByte *pBuff);
state DetermineState(HPCByte *pBuff);
int m_len;
};
class jpg_state : public State
{
public:
HPBool ProcessData(Machine *pMachine, HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten);
void setNextState(State *pState);
};
class xml_state : public State
{
public:
HPBool ProcessData(Machine *pMachine, HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten);
void setNextState(State *pState);
};
class send_state : public State
{
public:
HPBool ProcessData(Machine *pMachine, HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten);
void setNextState(State *pState);
};
class reset_state : public State
{
public:
HPBool ProcessData(Machine *pMachine, HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten);
void setNextState(State *pState);
};
class Machine
{
class State *current;
public:
Machine();
void setCurrentState(class State *s)
{
current = s;
}
HPBool Process(HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten);
};
class State
{
protected:
static int m_file_size;
static int m_rcxed_size;
Machine *pMachine;
static MemoryBuffer fBuffer;
public:
virtual HPBool ProcessData(Machine *pMachine, HPCByte *pBuff, HPDword cbBuff, HPUInt& bytesWritten) = 0;
virtual void setNextState() = 0;
};
