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#pragma once
#include "stream.h"
#include <util/generic/deque.h>
#include <util/generic/hash.h>
class TCompressionCodecFactory {
public:
using TDecoderConstructor = std::function<THolder<IInputStream>(IInputStream*)>;
using TEncoderConstructor = std::function<THolder<IOutputStream>(IOutputStream*)>;
TCompressionCodecFactory();
static inline TCompressionCodecFactory& Instance() noexcept {
return *SingletonWithPriority<TCompressionCodecFactory, 0>();
}
inline const TDecoderConstructor* FindDecoder(TStringBuf name) const {
if (auto codec = Codecs_.FindPtr(name)) {
return &codec->Decoder;
}
return nullptr;
}
inline const TEncoderConstructor* FindEncoder(TStringBuf name) const {
if (auto codec = Codecs_.FindPtr(name)) {
return &codec->Encoder;
}
return nullptr;
}
inline TArrayRef<const TStringBuf> GetBestCodecs() const {
return BestCodecs_;
}
private:
void Add(TStringBuf name, TDecoderConstructor d, TEncoderConstructor e);
struct TCodec {
TDecoderConstructor Decoder;
TEncoderConstructor Encoder;
};
TDeque<TString> Strings_;
THashMap<TStringBuf, TCodec> Codecs_;
TVector<TStringBuf> BestCodecs_;
};
namespace NHttp {
template <typename F>
TString ChooseBestCompressionScheme(F accepted, TArrayRef<const TStringBuf> available) {
if (available.empty()) {
return "identity";
}
if (accepted("*")) {
return TString(available[0]);
}
for (const auto& coding : available) {
TString s(coding);
if (accepted(s)) {
return s;
}
}
return "identity";
}
}
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