grammar-input-stream.hxx
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	// file : examples/cxx/tree/embedded/grammar-input-stream.hxx
	// author : Boris Kolpackov <boris@codesynthesis.com>
	// copyright : not copyrighted - public domain

	#ifndef GRAMMAR_INPUT_STREAM_HXX
	#define GRAMMAR_INPUT_STREAM_HXX

	#include <cstddef>
	#include <xercesc/util/BinInputStream.hpp>

	// Memory buffer input stream with the special-purpose schema
	// grammar decompression.
	//
	class grammar_input_stream: public xercesc::BinInputStream
	{
	public :
	grammar_input_stream (const XMLByte* data, std::size_t size);

	#if _XERCES_VERSION >= 30000

	virtual XMLFilePos
	curPos () const;

	virtual XMLSize_t
	readBytes (XMLByte* const buf, const XMLSize_t size);

	virtual const XMLCh*
	getContentType () const;

	#else

	virtual unsigned int
	curPos () const;

	virtual unsigned int
	readBytes (XMLByte* const buf, const unsigned int size);

	#endif

	private :
	const XMLByte* data_;
	std::size_t size_;
	std::size_t pos_;
	std::size_t vpos_;

	// Compression data.
	//
	size_t cseq_; // Number of bytes left in a compression sequence.
	bool alt_; // Alternating or sequential sequence.
	bool add_zero_; // Add a zero on the next read.
	};

	#endif // GRAMMAR_INPUT_STREAM_HXX