1 files changed, 113 insertions, 0 deletions
diff --git a/botan/src/filters/filter.h b/botan/src/filters/filter.h
new file mode 100644
index 0000000..b13a366
--- /dev/null
+++ b/botan/src/filters/filter.h
@@ -0,0 +1,113 @@
+/*
+* Filter
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_FILTER_H__
+#define BOTAN_FILTER_H__
+
+#include <botan/secmem.h>
+#include <vector>
+
+namespace Botan {
+
+/**
+* This class represents general abstract filter objects.
+*/
+class BOTAN_DLL Filter
+   {
+   public:
+
+      /**
+      * Write a portion of a message to this filter.
+      * @param input the input as a byte array
+      * @param length the length of the byte array input
+      */
+      virtual void write(const byte input[], u32bit length) = 0;
+
+      /**
+      * Start a new message. Must be closed by end_msg() before another
+      * message can be startet.
+      */
+      virtual void start_msg() {}
+
+      /**
+      * Tell the Filter that the current message shall be ended.
+      */
+      virtual void end_msg() {}
+
+      /**
+      * Check whether this filter is an attachable filter.
+      * @return true if this filter is attachable, false otherwise
+      */
+      virtual bool attachable() { return true; }
+
+      /**
+      * Start a new message in *this and all following filters. Only for
+      * internal use, not intended for use in client applications.
+      */
+      void new_msg();
+
+      /**
+      * End a new message in *this and all following filters. Only for
+      * internal use, not intended for use in client applications.
+      */
+      void finish_msg();
+
+      virtual ~Filter() {}
+   protected:
+      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;
+
+      // true if filter belongs to a pipe --> prohibit filter sharing!
+      bool owned;
+   };
+
+/**
+* This is the abstract Fanout_Filter base class.
+**/
+class BOTAN_DLL 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); }
+   };
+
+/**
+* The type of checking to be performed by decoders:
+* NONE - no checks, IGNORE_WS - perform checks, but ignore
+* whitespaces, FULL_CHECK - perform checks, also complain
+* about white spaces.
+*/
+enum Decoder_Checking { NONE, IGNORE_WS, FULL_CHECK };
+
+}
+
+#endif