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#ifndef DECODER_H
#define DECODER_H
#include <boost/iostreams/concepts.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/function.hpp>
#include <string>
class DecoderBase {
friend class DecoderFilter;
protected:
typedef boost::function<std::size_t (char*, std::size_t)> ReadFunc;
virtual size_t decode(ReadFunc read, uint8_t *output, size_t output_size) = 0;
public:
typedef boost::shared_ptr<DecoderBase> p;
virtual ~DecoderBase() {}
};
//! Input filter to hold a decoder in a filter chain.
class DecoderFilter : public boost::iostreams::multichar_input_filter {
private:
DecoderBase::p decoder;
//! Functor binding a source to a read function.
template<class T>
struct ReadFunc {
T& s;
ReadFunc(T& s_) : s(s_) {}
std::size_t operator()(char* buf, std::size_t buf_size) {
return boost::iostreams::read(s, buf, buf_size);
}
};
public:
typedef boost::shared_ptr<DecoderFilter> p;
DecoderFilter(DecoderBase::p decoder_);
template<typename Source>
std::streamsize read(Source& src, char *s, std::streamsize n) {
return decoder->decode(ReadFunc<Source>(src), (uint8_t*)s, n);
}
};
namespace decoder {
void init();
DecoderFilter::p get_decoder(const std::string& name);
};
#endif
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