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#ifndef ENCODER_H
#define ENCODER_H
#include <boost/iostreams/concepts.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/shared_ptr.hpp>
#include <iostream>
#include <string>
class EncoderBase {
public:
typedef boost::shared_ptr<EncoderBase> p;
virtual ~EncoderBase() {}
virtual size_t encode(const uint8_t *input, size_t input_size, uint8_t *output, size_t output_size) = 0;
virtual size_t flush(uint8_t *output, size_t output_size) = 0;
};
//! Input filter to hold an encoder in a filter chain.
class EncoderFilter : public boost::iostreams::multichar_input_filter {
private:
EncoderBase::p encoder;
public:
typedef boost::shared_ptr<EncoderFilter> p;
EncoderFilter(EncoderBase::p encoder_);
template<typename Source>
std::streamsize read(Source& src, char *s, std::streamsize n) {
char src_data[0x2000];
std::streamsize src_read = boost::iostreams::read(src, src_data, 0x2000);
if(src_read < 0)
src_read = 0;
std::streamsize size = encoder->encode((const uint8_t*)src_data, src_read, (uint8_t*)s, n);
// no more data, flush encoder
if(src_read == 0 && size == 0) {
size = encoder->flush((uint8_t*)s, n);
}
return size;
};
};
namespace encoder {
void init();
EncoderFilter::p get_encoder(const std::string& name);
};
#endif
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