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+// file : examples/cxx/tree/streaming/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);
+
+ virtual XMLFilePos
+ curPos () const;
+
+ virtual XMLSize_t
+ readBytes (XMLByte* const buf, const XMLSize_t size);
+
+ virtual const XMLCh*
+ getContentType () const;
+
+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