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+/** 
+ * @file llioutil.h
+ * @author Phoenix
+ * @date 2005-10-05
+ * @brief Helper classes for dealing with IOPipes
+ *
+ * Copyright (c) 2005-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLIOUTIL_H
+#define LL_LLIOUTIL_H
+
+#include "llbuffer.h"
+#include "lliopipe.h"
+#include "llpumpio.h"
+
+/** 
+ * @class LLIOFlush
+ * @brief This class is used as a mini chain head which drains the buffer.
+ * @see LLIOPipe
+ *
+ * An instance of this class acts as a useful chain head when all data
+ * is known, and you simply want to get the chain moving.
+ */
+class LLIOFlush : public LLIOPipe
+{
+public:
+	LLIOFlush() {}
+	virtual ~LLIOFlush() {}
+
+protected:
+	/* @name LLIOPipe virtual implementations
+	 */
+	//@{
+	/** 
+	 * @brief Process the data in buffer
+	 */
+	EStatus process_impl(
+		const LLChannelDescriptors& channels,
+		buffer_ptr_t& buffer,
+		bool& eos,
+		LLSD& context,
+		LLPumpIO* pump);
+	//@}
+protected:
+};
+
+/** 
+ * @class LLIOSleep
+ * @brief This is a simple helper class which will hold a chain and
+ * process it later using pump mechanisms
+ * @see LLIOPipe
+ */
+class LLIOSleep : public LLIOPipe
+{
+public:
+	LLIOSleep(F64 sleep_seconds) : mSeconds(sleep_seconds) {}
+	virtual ~LLIOSleep() {}
+
+protected:
+	/* @name LLIOPipe virtual implementations
+	 */
+	//@{
+	/** 
+	 * @brief Process the data in buffer
+	 */
+	EStatus process_impl(
+		const LLChannelDescriptors& channels,
+		buffer_ptr_t& buffer,
+		bool& eos,
+		LLSD& context,
+		LLPumpIO* pump);
+	//@}
+protected:
+	F64 mSeconds;
+};
+
+/** 
+ * @class LLIOAddChain
+ * @brief Simple pipe that just adds a chain to a pump.
+ * @see LLIOPipe
+ */
+class LLIOAddChain : public LLIOPipe
+{
+public:
+	LLIOAddChain(const LLPumpIO::chain_t& chain, F32 timeout) :
+		mChain(chain),
+		mTimeout(timeout)
+	{}
+	virtual ~LLIOAddChain() {}
+
+protected:
+	/* @name LLIOPipe virtual implementations
+	 */
+	//@{
+	/** 
+	 * @brief Process the data in buffer
+	 */
+	EStatus process_impl(
+		const LLChannelDescriptors& channels,
+		buffer_ptr_t& buffer,
+		bool& eos,
+		LLSD& context,
+		LLPumpIO* pump);
+	//@}
+
+protected:
+	LLPumpIO::chain_t mChain;
+	F32 mTimeout;
+};
+
+/** 
+ * @class LLChangeChannel
+ * @brief This class changes the channel of segments in the buffer
+ * @see LLBufferArray
+ *
+ * This class is useful for iterating over the segments in a buffer
+ * array and changing each channel that matches to a different
+ * channel.
+ * Example:
+ * <code>
+ * set_in_to_out(LLChannelDescriptors channels, LLBufferArray* buf)
+ * {
+ *   std::for_each(
+ *     buf->beginSegment(),
+ *     buf->endSegment(),
+ *     LLChangeChannel(channels.in(), channels.out()));
+ * }
+ * </code>
+ */
+class LLChangeChannel //: public unary_function<T, void>
+{
+public:
+	/** 
+	 * @brief Constructor for iterating over a segment range to change channel.
+	 *
+	 * @param is The channel to match when looking at a segment.
+	 * @param becomes The channel to set the segment when a match is found.
+	 */
+	LLChangeChannel(S32 is, S32 becomes);
+
+	/** 
+	 * @brief Do the work of changing the channel
+	 */
+	void operator()(LLSegment& segment);
+
+protected:
+	S32 mIs;
+	S32 mBecomes;
+};
+
+
+#endif // LL_LLIOUTIL_H