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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 <string>
class Source {
public:
virtual std::streamsize read(char* buf, std::streamsize buf_size) = 0;
};
template<class T>
class StreamSource : public Source {
private:
T& s;
public:
StreamSource(T& s_) : s(s_) {}
std::streamsize read(char* buf, std::streamsize buf_size) {
return boost::iostreams::read(s, buf, buf_size);
}
};
class DecoderBase {
public:
typedef boost::shared_ptr<DecoderBase> p;
virtual ~DecoderBase() {}
virtual size_t decode(Source& input, uint8_t *output, size_t output_size) = 0;
};
//! Input filter to hold a decoder in a filter chain.
class DecoderFilter : public boost::iostreams::multichar_input_filter {
private:
DecoderBase::p decoder;
public:
typedef boost::shared_ptr<DecoderFilter> p;
DecoderFilter(DecoderBase::p decoder_);
template<typename Source>
std::streamsize read(Source& src, char *s, std::streamsize n) {
StreamSource<Source> src_f(src);
return decoder->decode(src_f, (uint8_t*)s, n);
}
};
namespace decoder {
void init();
DecoderFilter::p get_decoder(const std::string& name);
};
#endif
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