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/*************************************************
* Filter Header File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#ifndef BOTAN_FILTER_H__
#define BOTAN_FILTER_H__
#include <botan/base.h>
#include <vector>
namespace Botan {
/*************************************************
* Filter Base Class *
*************************************************/
class Filter
{
public:
virtual void write(const byte[], u32bit) = 0;
virtual void start_msg() {}
virtual void end_msg() {}
virtual bool attachable() { return true; }
void new_msg();
void finish_msg();
virtual ~Filter() {}
protected:
virtual void send(const byte[], u32bit);
void send(byte input) { send(&input, 1); }
void send(const MemoryRegion<byte>& in) { send(in.begin(), in.size()); }
Filter();
private:
Filter(const Filter&) {}
Filter& operator=(const Filter&) { return (*this); }
friend class Pipe;
friend class Fanout_Filter;
u32bit total_ports() const;
u32bit current_port() const { return port_num; }
void set_port(u32bit);
u32bit owns() const { return filter_owns; }
void attach(Filter*);
void set_next(Filter*[], u32bit);
Filter* get_next() const;
SecureVector<byte> write_queue;
std::vector<Filter*> next;
u32bit port_num, filter_owns;
bool owned;
};
/*************************************************
* Fanout Filter Base Class *
*************************************************/
class Fanout_Filter : public Filter
{
protected:
void incr_owns() { ++filter_owns; }
void set_port(u32bit n) { Filter::set_port(n); }
void set_next(Filter* f[], u32bit n) { Filter::set_next(f, n); }
void attach(Filter* f) { Filter::attach(f); }
};
}
#endif
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