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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
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