intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

29 files changed, 863 insertions, 0 deletions

diff --git a/library/cpp/codecs/static/README b/library/cpp/codecs/static/README
new file mode 100644
index 0000000000..1b07f02433
--- /dev/null
+++ b/library/cpp/codecs/static/README
@@ -0,0 +1 @@
+Support of static libraries in library/cpp/codecs. See library/cpp/codecs/static/example.
diff --git a/library/cpp/codecs/static/builder.cpp b/library/cpp/codecs/static/builder.cpp
new file mode 100644
index 0000000000..93e34a3edb
--- /dev/null
+++ b/library/cpp/codecs/static/builder.cpp
@@ -0,0 +1,39 @@
+#include "builder.h"
+#include "common.h"
+
+#include <library/cpp/codecs/static/static_codec_info.pb.h>
+
+#include <library/cpp/codecs/codecs.h>
+
+#include <util/generic/yexception.h>
+#include <util/string/subst.h>
+
+namespace NCodecs {
+    TStaticCodecInfo BuildStaticCodec(const TVector<TString>& trainingData, const TCodecBuildInfo& info) {
+        TStaticCodecInfo result;
+        TCodecPtr codec = ICodec::GetInstance(info.CodecName);
+        Y_ENSURE_EX(codec, TCodecException() << "empty codec is not allowed");
+
+        codec->LearnX(trainingData.begin(), trainingData.end(), info.SampleSizeMultiplier);
+        {
+            TStringOutput sout{*result.MutableStoredCodec()};
+            ICodec::Store(&sout, codec);
+        }
+
+        auto& debugInfo = *result.MutableDebugInfo();
+        debugInfo.SetStoredCodecHash(DataSignature(result.GetStoredCodec()));
+        debugInfo.SetCodecName(info.CodecName);
+        debugInfo.SetSampleSizeMultiplier(info.SampleSizeMultiplier);
+        debugInfo.SetTimestamp(info.Timestamp);
+        debugInfo.SetRevisionInfo(info.RevisionInfo);
+        debugInfo.SetTrainingSetComment(info.TrainingSetComment);
+        debugInfo.SetTrainingSetResId(info.TrainingSetResId);
+        return result;
+    }
+
+    TString GetStandardFileName(const TStaticCodecInfo& info) {
+        TString cName = info.GetDebugInfo().GetCodecName();
+        SubstGlobal(cName, ':', '.');
+        return TStringBuilder() << cName << "." << info.GetDebugInfo().GetTimestamp() << ".codec_info";
+    }
+}
diff --git a/library/cpp/codecs/static/builder.h b/library/cpp/codecs/static/builder.h
new file mode 100644
index 0000000000..d7533be4d5
--- /dev/null
+++ b/library/cpp/codecs/static/builder.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "static.h"
+
+#include <library/cpp/svnversion/svnversion.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/string.h>
+#include <util/generic/vector.h>
+#include <util/string/builder.h>
+
+namespace NCodecs {
+    struct TCodecBuildInfo {
+        // optimal values from SEARCH-1655
+        TString CodecName = "solar-8k-a:zstd08d-1";
+        float SampleSizeMultiplier = 1;
+
+        // debug info:
+        time_t Timestamp = TInstant::Now().TimeT();
+        TString RevisionInfo = (TStringBuilder() << "r" << ToString(GetProgramSvnRevision()));
+        TString TrainingSetComment; // a human comment on the training data
+        TString TrainingSetResId;   // sandbox resid of the training set
+    };
+
+    TStaticCodecInfo BuildStaticCodec(const TVector<TString>& trainingData, const TCodecBuildInfo&);
+
+    TString GetStandardFileName(const TStaticCodecInfo&);
+
+}
diff --git a/library/cpp/codecs/static/common.h b/library/cpp/codecs/static/common.h
new file mode 100644
index 0000000000..211de2a27d
--- /dev/null
+++ b/library/cpp/codecs/static/common.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <util/string/hex.h>
+#include <util/digest/city.h>
+#include <util/system/byteorder.h>
+
+namespace NCodecs {
+    template <class T>
+    ui64 DataSignature(const T& t) {
+        static_assert(!std::is_scalar<T>::value, "no scalars");
+        return CityHash64(t.data(), t.size());
+    }
+
+    template <class T>
+    TString HexWriteScalar(T t) {
+        static_assert(std::is_scalar<T>::value, "scalars only");
+        t = LittleToBig(t);
+        TString res = HexEncode(&t, sizeof(t));
+        res.to_lower();
+        return res;
+    }
+
+    template <class T>
+    T HexReadScalar(TStringBuf s) {
+        static_assert(std::is_scalar<T>::value, "scalars only");
+        T t = 0;
+        HexDecode(s.data(), Min(s.size(), sizeof(T)), &t);
+        t = BigToLittle(t);
+        return t;
+    }
+
+}
diff --git a/library/cpp/codecs/static/example/example.cpp b/library/cpp/codecs/static/example/example.cpp
new file mode 100644
index 0000000000..5b750b717e
--- /dev/null
+++ b/library/cpp/codecs/static/example/example.cpp
@@ -0,0 +1,43 @@
+#include "example.h"
+
+#include <library/cpp/codecs/static/static.h>
+
+#include <util/generic/yexception.h>
+
+extern "C" {
+extern const ui8 codec_info_huff_20160707[];
+extern const ui32 codec_info_huff_20160707Size;
+extern const ui8 codec_info_sa_huff_20160707[];
+extern const ui32 codec_info_sa_huff_20160707Size;
+};
+
+namespace NStaticCodecExample {
+    static const NCodecs::TCodecConstPtr CODECS[] = {
+        nullptr,
+        NCodecs::RestoreCodecFromArchive(codec_info_huff_20160707, codec_info_huff_20160707Size),
+        NCodecs::RestoreCodecFromArchive(codec_info_sa_huff_20160707, codec_info_sa_huff_20160707Size),
+    };
+
+    static_assert(Y_ARRAY_SIZE(CODECS) == DV_COUNT, "bad array size");
+
+    void Encode(TBuffer& out, TStringBuf in, EDictVersion dv) {
+        Y_ENSURE(dv > DV_NULL && dv < DV_COUNT, "invalid dict version: " << (int)dv);
+        out.Clear();
+        if (!in) {
+            return;
+        }
+        CODECS[dv]->Encode(in, out);
+        out.Append((char)dv);
+    }
+
+    void Decode(TBuffer& out, TStringBuf in) {
+        out.Clear();
+        if (!in) {
+            return;
+        }
+        EDictVersion dv = (EDictVersion)in.back();
+        Y_ENSURE(dv > DV_NULL && dv < DV_COUNT, "invalid dict version: " << (int)dv);
+        in.Chop(1);
+        CODECS[dv]->Decode(in, out);
+    }
+}
diff --git a/library/cpp/codecs/static/example/example.h b/library/cpp/codecs/static/example/example.h
new file mode 100644
index 0000000000..f9b3a7324b
--- /dev/null
+++ b/library/cpp/codecs/static/example/example.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <util/generic/strbuf.h>
+#include <util/generic/buffer.h>
+
+namespace NStaticCodecExample {
+    enum EDictVersion : ui8 {
+        DV_NULL = 0,
+        DV_HUFF_20160707,
+        DV_SA_HUFF_20160707,
+        DV_COUNT
+    };
+
+    void Encode(TBuffer&, TStringBuf, EDictVersion dv = DV_SA_HUFF_20160707);
+
+    void Decode(TBuffer&, TStringBuf);
+}
diff --git a/library/cpp/codecs/static/example/huffman.1467494385.codec_info b/library/cpp/codecs/static/example/huffman.1467494385.codec_info
new file mode 100644
index 0000000000..5fc18270a6
--- /dev/null
+++ b/library/cpp/codecs/static/example/huffman.1467494385.codec_info
diff --git a/library/cpp/codecs/static/example/solar-8k-a.huffman.1467494385.codec_info b/library/cpp/codecs/static/example/solar-8k-a.huffman.1467494385.codec_info
new file mode 100644
index 0000000000..d36d8e24ec
--- /dev/null
+++ b/library/cpp/codecs/static/example/solar-8k-a.huffman.1467494385.codec_info
diff --git a/library/cpp/codecs/static/example/ya.make b/library/cpp/codecs/static/example/ya.make
new file mode 100644
index 0000000000..ca6c5fd900
--- /dev/null
+++ b/library/cpp/codecs/static/example/ya.make
@@ -0,0 +1,24 @@
+LIBRARY()
+
+OWNER(velavokr)
+
+SRCS(
+    GLOBAL example.cpp
+)
+
+PEERDIR(
+    library/cpp/codecs
+    library/cpp/codecs/static
+)
+
+ARCHIVE_ASM(
+    "solar-8k-a.huffman.1467494385.codec_info"
+    NAME codec_info_sa_huff_20160707
+)
+
+ARCHIVE_ASM(
+    "huffman.1467494385.codec_info"
+    NAME codec_info_huff_20160707
+)
+
+END()
diff --git a/library/cpp/codecs/static/static.cpp b/library/cpp/codecs/static/static.cpp
new file mode 100644
index 0000000000..44a07dd73a
--- /dev/null
+++ b/library/cpp/codecs/static/static.cpp
@@ -0,0 +1,98 @@
+#include "static.h"
+#include "common.h"
+
+#include <library/cpp/codecs/static/static_codec_info.pb.h>
+#include <library/cpp/archive/yarchive.h>
+
+#include <util/draft/datetime.h>
+
+#include <util/string/builder.h>
+#include <util/stream/buffer.h>
+#include <util/stream/mem.h>
+#include <util/string/hex.h>
+#include <util/ysaveload.h>
+
+namespace NCodecs {
+    static constexpr TStringBuf STATIC_CODEC_INFO_MAGIC = "CodecInf";
+
+    static TStringBuf GetStaticCodecInfoMagic() {
+        return STATIC_CODEC_INFO_MAGIC;
+    }
+
+    void SaveCodecInfoToStream(IOutputStream& out, const TStaticCodecInfo& info) {
+        TBufferOutput bout;
+        info.SerializeToArcadiaStream(&bout);
+        ui64 hash = DataSignature(bout.Buffer());
+        out.Write(GetStaticCodecInfoMagic());
+        ::Save(&out, hash);
+        ::Save(&out, bout.Buffer());
+    }
+
+    TStaticCodecInfo LoadCodecInfoFromStream(IInputStream& in) {
+        {
+            TBuffer magic;
+            magic.Resize(GetStaticCodecInfoMagic().size());
+            Y_ENSURE_EX(in.Read(magic.Data(), GetStaticCodecInfoMagic().size()) == GetStaticCodecInfoMagic().size(),
+                        TCodecException() << "bad codec info");
+            Y_ENSURE_EX(TStringBuf(magic.data(), magic.size()) == GetStaticCodecInfoMagic(),
+                        TCodecException() << "bad codec info");
+        }
+
+        ui64 hash;
+        ::Load(&in, hash);
+        TBuffer info;
+        ::Load(&in, info);
+        Y_ENSURE_EX(hash == DataSignature(info), TCodecException() << "bad codec info");
+
+        TStaticCodecInfo result;
+        Y_ENSURE_EX(result.ParseFromArray(info.data(), info.size()), TCodecException() << "bad codec info");
+
+        return result;
+    }
+
+    TString SaveCodecInfoToString(const TStaticCodecInfo& info) {
+        TStringStream s;
+        SaveCodecInfoToStream(s, info);
+        return s.Str();
+    }
+
+    TStaticCodecInfo LoadCodecInfoFromString(TStringBuf data) {
+        TMemoryInput m{data.data(), data.size()};
+        return LoadCodecInfoFromStream(m);
+    }
+
+    TString FormatCodecInfo(const TStaticCodecInfo& ci) {
+        TStringBuilder s;
+        s << "codec name:      " << ci.GetDebugInfo().GetCodecName() << Endl;
+        s << "codec hash:      " << HexWriteScalar(ci.GetDebugInfo().GetStoredCodecHash()) << Endl;
+        s << "dict size:       " << ci.GetStoredCodec().Size() << Endl;
+        s << "sample mult:     " << ci.GetDebugInfo().GetSampleSizeMultiplier() << Endl;
+        s << "orig.compress:   " << ci.GetDebugInfo().GetCompression() * 100 << " %" << Endl;
+        s << "timestamp:       " << ci.GetDebugInfo().GetTimestamp() << " ("
+          << NDatetime::TSimpleTM::NewLocal(ci.GetDebugInfo().GetTimestamp()).ToString()
+          << ")" << Endl;
+        s << "revision:        " << ci.GetDebugInfo().GetRevisionInfo() << Endl;
+        s << "training set comment: " << ci.GetDebugInfo().GetTrainingSetComment() << Endl;
+        s << "training set resId:   " << ci.GetDebugInfo().GetTrainingSetResId() << Endl;
+        return s;
+    }
+
+    TString LoadStringFromArchive(const ui8* begin, size_t size) {
+        TArchiveReader ar(TBlob::NoCopy(begin, size));
+        Y_VERIFY(ar.Count() == 1, "invalid number of entries");
+        auto blob = ar.ObjectBlobByKey(ar.KeyByIndex(0));
+        return TString{blob.AsCharPtr(), blob.Size()};
+    }
+
+    TCodecConstPtr RestoreCodecFromCodecInfo(const TStaticCodecInfo& info) {
+        return NCodecs::ICodec::RestoreFromString(info.GetStoredCodec());
+    }
+
+    TCodecConstPtr RestoreCodecFromArchive(const ui8* begin, size_t size) {
+        const auto& data = LoadStringFromArchive(begin, size);
+        const auto& info = LoadCodecInfoFromString(data);
+        const auto& codec = RestoreCodecFromCodecInfo(info);
+        Y_ENSURE_EX(codec, TCodecException() << "null codec");
+        return codec;
+    }
+}
diff --git a/library/cpp/codecs/static/static.h b/library/cpp/codecs/static/static.h
new file mode 100644
index 0000000000..c1eaed2a74
--- /dev/null
+++ b/library/cpp/codecs/static/static.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <library/cpp/codecs/codecs.h>
+
+#include <util/generic/strbuf.h>
+#include <util/generic/string.h>
+#include <util/stream/output.h>
+
+namespace NCodecs {
+    class TStaticCodecInfo;
+
+    // load
+
+    TCodecConstPtr RestoreCodecFromCodecInfo(const TStaticCodecInfo&);
+
+    TStaticCodecInfo LoadCodecInfoFromString(TStringBuf data);
+
+    TString LoadStringFromArchive(const ui8* begin, size_t size);
+
+    TCodecConstPtr RestoreCodecFromArchive(const ui8* begin, size_t size);
+
+    // save
+
+    TString SaveCodecInfoToString(const TStaticCodecInfo&);
+
+    void SaveCodecInfoToStream(IOutputStream& out, const TStaticCodecInfo&);
+
+    // misc
+
+    TStaticCodecInfo LoadCodecInfoFromStream(IInputStream& in);
+
+    TString FormatCodecInfo(const TStaticCodecInfo&);
+
+}
diff --git a/library/cpp/codecs/static/static_codec_info.proto b/library/cpp/codecs/static/static_codec_info.proto
new file mode 100644
index 0000000000..362abb4dad
--- /dev/null
+++ b/library/cpp/codecs/static/static_codec_info.proto
@@ -0,0 +1,17 @@
+package NCodecs;
+
+message TStaticCodecInfo {
+    message TDebugInfo {
+        optional string CodecName = 1;           // the exact codec variant name
+        optional uint64 Timestamp = 2;           // when the codec was built
+        optional string RevisionInfo = 3;        // the arcadia revision info
+        optional float SampleSizeMultiplier = 4; // how the default sample size was modified to improve compression
+        optional float Compression = 5;          // the compression on the training set ((raw_size - coded_size) / raw_size)
+        optional string TrainingSetComment = 6;  // a human readable description of the training set
+        optional string TrainingSetResId = 7;    // the training set sandbox resource id
+        optional uint64 StoredCodecHash = 8;     // cityhash64(data)
+    }
+    
+    optional bytes StoredCodec = 1;           // the data of the codec
+    optional TDebugInfo DebugInfo = 2;        // misc debug info which could be useful in finding whereabouts later
+}
diff --git a/library/cpp/codecs/static/tools/common/ct_common.cpp b/library/cpp/codecs/static/tools/common/ct_common.cpp
new file mode 100644
index 0000000000..fe77691280
--- /dev/null
+++ b/library/cpp/codecs/static/tools/common/ct_common.cpp
@@ -0,0 +1,74 @@
+#include "ct_common.h"
+
+#include <library/cpp/codecs/codecs.h>
+#include <library/cpp/codecs/static/static_codec_info.pb.h>
+#include <library/cpp/string_utils/base64/base64.h>
+
+#include <util/stream/output.h>
+#include <util/string/builder.h>
+#include <util/system/hp_timer.h>
+
+namespace NCodecs {
+    TString TComprStats::Format(const TStaticCodecInfo& info, bool checkMode) const {
+        TStringBuilder s;
+        s << "raw size/item:      " << RawSizePerRecord() << Endl;
+        s << "enc.size/item:      " << EncSizePerRecord() << Endl;
+        if (checkMode) {
+            s << "orig.enc.size/item: " << OldEncSizePerRecord(info.GetDebugInfo().GetCompression()) << Endl;
+        }
+        s << "enc time us/item:   " << EncTimePerRecordUS() << Endl;
+        s << "dec time us/item:   " << DecTimePerRecordUS() << Endl;
+        s << "dict size:          " << info.GetStoredCodec().Size() << Endl;
+        s << "compression:        " << AsPercent(Compression()) << " %" << Endl;
+        if (checkMode) {
+            s << "orig.compression:   " << AsPercent(info.GetDebugInfo().GetCompression()) << " %" << Endl;
+        }
+        return s;
+    }
+
+    TComprStats TestCodec(const ICodec& c, const TVector<TString>& input) {
+        TComprStats stats;
+
+        TBuffer encodeBuffer;
+        TBuffer decodeBuffer;
+        for (const auto& data : input) {
+            encodeBuffer.Clear();
+            decodeBuffer.Clear();
+
+            stats.Records += 1;
+            stats.RawSize += data.size();
+
+            THPTimer timer;
+            c.Encode(data, encodeBuffer);
+            stats.EncSize += encodeBuffer.size();
+            stats.EncSeconds += timer.PassedReset();
+
+            c.Decode(TStringBuf{encodeBuffer.data(), encodeBuffer.size()}, decodeBuffer);
+            stats.DecSeconds += timer.PassedReset();
+            Y_ENSURE(data == TStringBuf(decodeBuffer.data(), decodeBuffer.size()), "invalid encoding at record " << stats.Records);
+        }
+
+        return stats;
+    }
+
+    void ParseBlob(TVector<TString>& result, EDataStreamFormat fmt, const TBlob& blob) {
+        TStringBuf bin(blob.AsCharPtr(), blob.Size());
+        TStringBuf line;
+        TString buffer;
+        while (bin.ReadLine(line)) {
+            if (DSF_BASE64_LF == fmt) {
+                Base64Decode(line, buffer);
+                line = buffer;
+            }
+            if (!line) {
+                continue;
+            }
+            result.emplace_back(line.data(), line.size());
+        }
+    }
+
+    TBlob GetInputBlob(const TString& dataFile) {
+        return dataFile && dataFile != "-" ? TBlob::FromFile(dataFile) : TBlob::FromStream(Cin);
+    }
+
+}
diff --git a/library/cpp/codecs/static/tools/common/ct_common.h b/library/cpp/codecs/static/tools/common/ct_common.h
new file mode 100644
index 0000000000..9d3dcbda93
--- /dev/null
+++ b/library/cpp/codecs/static/tools/common/ct_common.h
@@ -0,0 +1,75 @@
+#pragma once
+
+#include <util/generic/string.h>
+#include <util/generic/vector.h>
+#include <util/memory/blob.h>
+#include <cmath>
+
+namespace NCodecs {
+    class TStaticCodecInfo;
+    class ICodec;
+
+    struct TComprStats {
+        double EncSeconds = 0;
+        double DecSeconds = 0;
+        size_t Records = 0;
+        size_t RawSize = 0;
+        size_t EncSize = 0;
+
+        static double Round(double n, size_t decPlaces = 2) {
+            double p = pow(10, decPlaces);
+            return round(n * p) / p;
+        }
+
+        static double AsPercent(double n) {
+            return Round(n * 100);
+        }
+
+        static double AsMicroSecond(double s) {
+            return s * 1000000;
+        }
+
+        double PerRecord(double n) const {
+            return Round((double)(Records ? n / Records : 0));
+        }
+
+        double Compression() const {
+            return ((double)RawSize - (double)EncSize) / RawSize;
+        }
+
+        double EncTimePerRecordUS() const {
+            return PerRecord(AsMicroSecond(EncSeconds));
+        }
+
+        double DecTimePerRecordUS() const {
+            return PerRecord(AsMicroSecond(DecSeconds));
+        }
+
+        double RawSizePerRecord() const {
+            return PerRecord(RawSize);
+        }
+
+        double EncSizePerRecord() const {
+            return PerRecord(EncSize);
+        }
+
+        double OldEncSizePerRecord(double compr) const {
+            return PerRecord((1 - compr) * RawSize);
+        }
+
+        TString Format(const TStaticCodecInfo&, bool checkMode) const;
+    };
+
+    TComprStats TestCodec(const ICodec&, const TVector<TString>& data);
+
+    enum EDataStreamFormat {
+        DSF_NONE,
+        DSF_PLAIN_LF /* "plain" */,
+        DSF_BASE64_LF /* "base64" */,
+    };
+
+    void ParseBlob(TVector<TString>&, EDataStreamFormat, const TBlob&);
+
+    TBlob GetInputBlob(const TString& dataFile);
+
+}
diff --git a/library/cpp/codecs/static/tools/common/ya.make b/library/cpp/codecs/static/tools/common/ya.make
new file mode 100644
index 0000000000..d624222dad
--- /dev/null
+++ b/library/cpp/codecs/static/tools/common/ya.make
@@ -0,0 +1,19 @@
+LIBRARY()
+
+OWNER(velavokr)
+
+SRCS(
+    ct_common.cpp
+)
+
+PEERDIR(
+    library/cpp/codecs
+    library/cpp/codecs/static
+    library/cpp/getopt/small
+    library/cpp/string_utils/base64
+    util/draft
+)
+
+GENERATE_ENUM_SERIALIZATION(ct_common.h)
+
+END()
diff --git a/library/cpp/codecs/static/tools/static_codec_checker/README b/library/cpp/codecs/static/tools/static_codec_checker/README
new file mode 100644
index 0000000000..723a68300b
--- /dev/null
+++ b/library/cpp/codecs/static/tools/static_codec_checker/README
@@ -0,0 +1,4 @@
+This is a viewer for generated codec and utility for verification of the compression quality on a new data.
+
+Usage:
+static_codec_checker -t -c 029b29ff64a74927.codec_info -f plain samples.txt
diff --git a/library/cpp/codecs/static/tools/static_codec_checker/static_codec_checker.cpp b/library/cpp/codecs/static/tools/static_codec_checker/static_codec_checker.cpp
new file mode 100644
index 0000000000..9c8d568d82
--- /dev/null
+++ b/library/cpp/codecs/static/tools/static_codec_checker/static_codec_checker.cpp
@@ -0,0 +1,73 @@
+#include <library/cpp/codecs/static/tools/common/ct_common.h>
+#include <library/cpp/codecs/static/static.h>
+#include <library/cpp/codecs/static/static_codec_info.pb.h>
+#include <library/cpp/codecs/codecs.h>
+#include <library/cpp/getopt/small/last_getopt.h>
+
+#include <util/digest/city.h>
+#include <util/generic/yexception.h>
+#include <util/stream/file.h>
+#include <util/stream/buffer.h>
+#include <util/stream/format.h>
+#include <util/string/builder.h>
+
+int main(int argc, char** argv) {
+    NCodecs::TCodecPtr codecPtr;
+    NCodecs::EDataStreamFormat fmt = NCodecs::DSF_NONE;
+    TString codecFile;
+    bool testCompression = false;
+
+    auto opts = NLastGetopt::TOpts::Default();
+    opts.SetTitle("Prints a .codec_info file and optionally checks its performance on new data. See also static_codec_generator.");
+    opts.SetCmdLineDescr("-c 9089f3e9b7a0f0d4.codec_info -t -f base64 qtrees.sample.txt");
+    NCodecs::TStaticCodecInfo codec;
+
+    opts.AddLongOption('c', "codec-info").RequiredArgument("codec_info").Handler1T<TString>([&codecFile, &codec, &codecPtr](TString name) {
+                                                                            codecFile = name;
+                                                                            codec.CopyFrom(NCodecs::LoadCodecInfoFromString(TUnbufferedFileInput(name).ReadAll()));
+                                                                            codecPtr = NCodecs::ICodec::RestoreFromString(codec.GetStoredCodec());
+                                                                        })
+        .Required()
+        .Help(".codec_info file with serialized static data for codec");
+
+    opts.AddLongOption('t', "test").NoArgument().StoreValue(&testCompression, true).Optional().Help("test current performance");
+
+    opts.AddLongOption('f', "format").RequiredArgument(TStringBuilder() << "(" << NCodecs::DSF_PLAIN_LF << "|" << NCodecs::DSF_BASE64_LF << ")").StoreResult(&fmt).Optional().Help("test set input file format");
+
+    opts.SetFreeArgsMin(0);
+    opts.SetFreeArgTitle(0, "testing_set_input_file", "testing set input files");
+
+    NLastGetopt::TOptsParseResult res(&opts, argc, argv);
+
+    Cout << codecFile << Endl;
+    Cout << NCodecs::FormatCodecInfo(codec) << Endl;
+
+    if (testCompression) {
+        if (NCodecs::DSF_NONE == fmt) {
+            Cerr << "Specify format (-f|--format) for testing set input" << Endl;
+            exit(1);
+        }
+
+        Cout << "Reading testing set data ... " << Flush;
+
+        TVector<TString> allData;
+        for (const auto& freeArg : res.GetFreeArgs()) {
+            NCodecs::ParseBlob(allData, fmt, NCodecs::GetInputBlob(freeArg));
+        }
+
+        if (!res.GetFreeArgs()) {
+            NCodecs::ParseBlob(allData, fmt, NCodecs::GetInputBlob("-"));
+        }
+
+        Cout << "Done" << Endl << Endl;
+
+        Cout << "records:  " << allData.size() << Endl;
+        Cout << "raw size: " << NCodecs::GetInputSize(allData.begin(), allData.end()) << " bytes" << Endl << Endl;
+
+        Cout << "Testing compression ... " << Flush;
+        auto stats = NCodecs::TestCodec(*codecPtr, allData);
+        Cout << "Done" << Endl << Endl;
+
+        Cout << stats.Format(codec, true) << Endl;
+    }
+}
diff --git a/library/cpp/codecs/static/tools/static_codec_checker/ya.make b/library/cpp/codecs/static/tools/static_codec_checker/ya.make
new file mode 100644
index 0000000000..90e06ca448
--- /dev/null
+++ b/library/cpp/codecs/static/tools/static_codec_checker/ya.make
@@ -0,0 +1,16 @@
+PROGRAM()
+
+OWNER(velavokr)
+
+SRCS(
+    static_codec_checker.cpp
+)
+
+PEERDIR(
+    library/cpp/codecs
+    library/cpp/codecs/static
+    library/cpp/codecs/static/tools/common
+    library/cpp/getopt/small
+)
+
+END()
diff --git a/library/cpp/codecs/static/tools/static_codec_generator/README b/library/cpp/codecs/static/tools/static_codec_generator/README
new file mode 100644
index 0000000000..e6bb52b959
--- /dev/null
+++ b/library/cpp/codecs/static/tools/static_codec_generator/README
@@ -0,0 +1,4 @@
+This is a utility for reproducible  teaching of a codec. And also for saving it into a file with a unique name for a static compilation as a resource.
+
+Usage:
+static_codec_generator -t -m 'the training data description' -f plain samples.txt
diff --git a/library/cpp/codecs/static/tools/static_codec_generator/static_codec_generator.cpp b/library/cpp/codecs/static/tools/static_codec_generator/static_codec_generator.cpp
new file mode 100644
index 0000000000..45fdb5c5fe
--- /dev/null
+++ b/library/cpp/codecs/static/tools/static_codec_generator/static_codec_generator.cpp
@@ -0,0 +1,82 @@
+#include <library/cpp/codecs/static/tools/common/ct_common.h>
+#include <library/cpp/codecs/static/static_codec_info.pb.h>
+#include <library/cpp/codecs/static/builder.h>
+#include <library/cpp/codecs/codecs.h>
+
+#include <library/cpp/getopt/small/last_getopt.h>
+
+#include <util/generic/yexception.h>
+#include <util/stream/file.h>
+#include <util/string/builder.h>
+
+int main(int argc, char** argv) {
+    NCodecs::TCodecBuildInfo info;
+    NCodecs::EDataStreamFormat fmt = NCodecs::DSF_NONE;
+
+    auto opts = NLastGetopt::TOpts::Default();
+    opts.SetCmdLineDescr("-m 'Training set: 100000 qtrees taken from web mmeta logs' -f base64 qtrees.sample.txt");
+    opts.SetTitle("Teaches the codec and serializes it as a file named CODECNAME.hash(CODECDATA).bin");
+
+    opts.AddLongOption('m', "message").RequiredArgument("training_set_comment").StoreResult(&info.TrainingSetComment).Required().Help("a human description for the training set");
+
+    opts.AddLongOption('r', "resource").RequiredArgument("training_set_res_id").StoreResult(&info.TrainingSetResId).Optional().Help("sandbox resource id for the training set");
+
+    opts.AddLongOption('c', "codec").RequiredArgument("codec_name").StoreResult(&info.CodecName).Optional().DefaultValue(info.CodecName);
+
+    opts.AddLongOption('s', "sample-multiplier").RequiredArgument("multiplier").StoreResult(&info.SampleSizeMultiplier).Optional().DefaultValue(ToString(info.SampleSizeMultiplier)).Help("multiplier for default sample size");
+
+    opts.AddLongOption('f', "format").RequiredArgument(TStringBuilder() << "(" << NCodecs::DSF_PLAIN_LF << "|" << NCodecs::DSF_BASE64_LF << ")").StoreResult(&fmt).Required().Help("training set input file format");
+
+    opts.AddLongOption("list-codecs").NoArgument().Handler0([]() {
+                                                      Cout << JoinStrings(NCodecs::ICodec::GetCodecsList(), "\n") << Endl;
+                                                      exit(0);
+                                                  })
+        .Optional()
+        .Help("list available codecs");
+
+    opts.AddLongOption("fake-revision").RequiredArgument("revision").StoreResult(&info.RevisionInfo).Optional().Hidden(); // replace static_codec_generator revision in debug info
+
+    opts.AddLongOption("fake-timestamp").RequiredArgument("timestamp").StoreResult(&info.Timestamp).Optional().Hidden(); // replace generating timestamp in debug info
+
+    opts.SetFreeArgsMin(0);
+    opts.SetFreeArgTitle(0, "training_set_input_file", "training set input files");
+
+    NLastGetopt::TOptsParseResult res(&opts, argc, argv);
+
+    Cout << "Reading training set data ... " << Flush;
+    TVector<TString> allData;
+    for (const auto& freeArg : res.GetFreeArgs()) {
+        NCodecs::ParseBlob(allData, fmt, NCodecs::GetInputBlob(freeArg));
+    }
+
+    if (!res.GetFreeArgs()) {
+        NCodecs::ParseBlob(allData, fmt, NCodecs::GetInputBlob("-"));
+    }
+    Cout << "Done" << Endl << Endl;
+
+    Cout << "records:  " << allData.size() << Endl;
+    Cout << "raw size: " << NCodecs::GetInputSize(allData.begin(), allData.end()) << " bytes" << Endl << Endl;
+
+    Cout << "Training " << info.CodecName << " , sample size multiplier is " << info.SampleSizeMultiplier << " ... " << Flush;
+    auto codec = NCodecs::BuildStaticCodec(allData, info);
+    Cout << "Done" << Endl;
+
+    TString codecName = NCodecs::GetStandardFileName(codec);
+    NCodecs::TCodecPtr codecPtr = NCodecs::ICodec::RestoreFromString(codec.GetStoredCodec());
+
+    Cout << "Testing compression ... " << Flush;
+    auto stats = NCodecs::TestCodec(*codecPtr, allData);
+    Cout << "Done" << Endl << Endl;
+
+    codec.MutableDebugInfo()->SetCompression(stats.Compression());
+
+    Cout << stats.Format(codec, false) << Endl;
+
+    Cout << "Saving as " << codecName << " ... " << Flush;
+    {
+        TUnbufferedFileOutput fout{codecName};
+        NCodecs::SaveCodecInfoToStream(fout, codec);
+        fout.Finish();
+    }
+    Cout << "Done" << Endl << Endl;
+}
diff --git a/library/cpp/codecs/static/tools/static_codec_generator/ya.make b/library/cpp/codecs/static/tools/static_codec_generator/ya.make
new file mode 100644
index 0000000000..efbc440dd1
--- /dev/null
+++ b/library/cpp/codecs/static/tools/static_codec_generator/ya.make
@@ -0,0 +1,17 @@
+PROGRAM()
+
+OWNER(velavokr)
+
+SRCS(
+    static_codec_generator.cpp
+)
+
+PEERDIR(
+    library/cpp/codecs
+    library/cpp/codecs/static
+    library/cpp/codecs/static/tools/common
+    library/cpp/digest/md5
+    library/cpp/getopt/small
+)
+
+END()
diff --git a/library/cpp/codecs/static/tools/tests/canondata/result.json b/library/cpp/codecs/static/tools/tests/canondata/result.json
new file mode 100644
index 0000000000..7a637c6763
--- /dev/null
+++ b/library/cpp/codecs/static/tools/tests/canondata/result.json
@@ -0,0 +1,6 @@
+{
+    "static_codec_tools.test_static_codec_tools": {
+        "checksum": "960e3c8c57fb846ab53ccbd07e287233",
+        "uri": "sbr://144512644/static_codec_tools.test_static_codec_tools/solar-8k-a.huffman.1467494385.codec_info"
+    }
+}
\ No newline at end of file
diff --git a/library/cpp/codecs/static/tools/tests/static_codec_tools.py b/library/cpp/codecs/static/tools/tests/static_codec_tools.py
new file mode 100644
index 0000000000..db4140e370
--- /dev/null
+++ b/library/cpp/codecs/static/tools/tests/static_codec_tools.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+
+import yatest.common as tt
+import os.path as op
+
+def test_static_codec_tools():
+    tt.execute([tt.binary_path("library/cpp/codecs/static/tools/static_codec_generator/static_codec_generator")]
+        + ["-m", "test codec", "-r", "sbr://143310406", "-f", "plain", "-c", "solar-8k-a:huffman", "-s", "1",
+            "--fake-revision", "r2385905", "--fake-timestamp", "1467494385", "sample.txt"],
+        timeout=60)
+    assert(op.exists("solar-8k-a.huffman.1467494385.codec_info"))
+    tt.canonical_execute(tt.binary_path("library/cpp/codecs/static/tools/static_codec_checker/static_codec_checker"),
+        args=["-c", "solar-8k-a.huffman.1467494385.codec_info"],
+        timeout=60)
+    tt.execute([tt.binary_path("library/cpp/codecs/static/tools/static_codec_checker/static_codec_checker")]
+        + ["-c", "solar-8k-a.huffman.1467494385.codec_info", "-f", "plain", "-t", "sample.txt"],
+        timeout=60)
+    return tt.canonical_file("solar-8k-a.huffman.1467494385.codec_info")
diff --git a/library/cpp/codecs/static/tools/tests/ya.make b/library/cpp/codecs/static/tools/tests/ya.make
new file mode 100644
index 0000000000..c5324eaf53
--- /dev/null
+++ b/library/cpp/codecs/static/tools/tests/ya.make
@@ -0,0 +1,20 @@
+PY2TEST()
+
+OWNER(velavokr)
+
+TEST_SRCS(static_codec_tools.py)
+
+DATA(sbr://143310406)
+
+TIMEOUT(4200)
+
+TAG(ya:not_autocheck)
+
+DEPENDS(
+    library/cpp/codecs/static/tools/static_codec_checker
+    library/cpp/codecs/static/tools/static_codec_generator
+)
+
+
+
+END()
diff --git a/library/cpp/codecs/static/tools/ya.make b/library/cpp/codecs/static/tools/ya.make
new file mode 100644
index 0000000000..dd3e8437aa
--- /dev/null
+++ b/library/cpp/codecs/static/tools/ya.make
@@ -0,0 +1,5 @@
+RECURSE(
+    common
+    static_codec_generator
+    static_codec_checker
+)
diff --git a/library/cpp/codecs/static/ut/builder_ut.cpp b/library/cpp/codecs/static/ut/builder_ut.cpp
new file mode 100644
index 0000000000..b47c279ed1
--- /dev/null
+++ b/library/cpp/codecs/static/ut/builder_ut.cpp
@@ -0,0 +1,57 @@
+#include <library/cpp/testing/unittest/registar.h>
+#include <library/cpp/codecs/static/builder.h>
+#include <library/cpp/codecs/static/static_codec_info.pb.h>
+#include <util/string/vector.h>
+
+class TStaticCodecInfoBuilderTest: public NUnitTest::TTestBase {
+    UNIT_TEST_SUITE(TStaticCodecInfoBuilderTest)
+    UNIT_TEST(TestBuild)
+    UNIT_TEST_SUITE_END();
+
+private:
+    TVector<TString> PrepareData() {
+        TVector<TString> data;
+        for (ui32 i = 'a'; i <= 'z'; ++i) {
+            data.push_back(TString(1, (char)i));
+        }
+        return data;
+    }
+
+    void TestBuild() {
+        TVector<TString> data;
+        NCodecs::TCodecBuildInfo info;
+        info.CodecName = "huffman";
+        info.SampleSizeMultiplier = 2;
+        info.Timestamp = 1467494385;
+        info.RevisionInfo = "r2385905";
+        info.TrainingSetComment = "some dummy data";
+        info.TrainingSetResId = "sbr://1234";
+        auto res = NCodecs::BuildStaticCodec(PrepareData(), info);
+        UNIT_ASSERT_VALUES_EQUAL(res.ShortUtf8DebugString(),
+                                 "StoredCodec: \"\\007\\000huffman@S\\000a"
+                                 "\\006b\\005c\\005d\\005e\\005f\\005g\\005h\\005i\\005j\\005k\\005l\\005m\\005n\\005o"
+                                 "\\005p\\005q\\005r\\005s\\005t\\005u\\004v\\004w\\004x\\004y\\004z\\004\xC7?\xC8>"
+                                 "\xC9=\xCA<\xCB;\xCC:\3159\3168\3177\3206\3215\3224\3233\3242\3251\3260\xD7/\xD8."
+                                 "\xD9-\xDA,\xDB+\xDC*\xDD)\xDE(\xDF\\'\xE0&\xE1%\xE2$\xE3#\xE4\\\"\xE5!\xE6 \xE7"
+                                 "\\037\xE8\\036\xE9\\035\xEA\\034\xEB\\033\xEC\\032\xED\\031\xEE\\030\xEF\\027\xF0"
+                                 "\\026\xF1\\025\xF2\\024\xF3\\023\xF4\\022\xF5\\021\xF6\\020\xF7\\017\xF8\\016\xF9"
+                                 "\\r\xFA\\014\xFB\\013\xFC\\n\xFD\\t\xFE\\010\xFF\\007\" "
+                                 "DebugInfo { "
+                                 "CodecName: \"huffman\" "
+                                 "Timestamp: 1467494385 "
+                                 "RevisionInfo: \"r2385905\" "
+                                 "SampleSizeMultiplier: 2 "
+                                 "TrainingSetComment: \"some dummy data\" "
+                                 "TrainingSetResId: \"sbr://1234\" "
+                                 "StoredCodecHash: 2509195835471488613 "
+                                 "}");
+
+        UNIT_ASSERT_VALUES_EQUAL(NCodecs::GetStandardFileName(res), "huffman.1467494385.codec_info");
+        UNIT_ASSERT_VALUES_EQUAL(res.GetDebugInfo().GetStoredCodecHash(), 2509195835471488613ULL);
+
+        auto res1 = NCodecs::LoadCodecInfoFromString(NCodecs::SaveCodecInfoToString(res));
+        UNIT_ASSERT_VALUES_EQUAL(res1.ShortUtf8DebugString(), res.ShortUtf8DebugString());
+    }
+};
+
+UNIT_TEST_SUITE_REGISTRATION(TStaticCodecInfoBuilderTest);
diff --git a/library/cpp/codecs/static/ut/static_ut.cpp b/library/cpp/codecs/static/ut/static_ut.cpp
new file mode 100644
index 0000000000..57e1e62887
--- /dev/null
+++ b/library/cpp/codecs/static/ut/static_ut.cpp
@@ -0,0 +1,27 @@
+#include <library/cpp/testing/unittest/registar.h>
+#include <library/cpp/codecs/static/example/example.h>
+
+class TStaticCodecUsageTest: public NUnitTest::TTestBase {
+    UNIT_TEST_SUITE(TStaticCodecUsageTest)
+    UNIT_TEST(TestUsage)
+    UNIT_TEST_SUITE_END();
+
+private:
+    void DoTestUsage(NStaticCodecExample::EDictVersion dv, size_t expectedSize) {
+        const TStringBuf letov = "Всё идёт по плану";
+
+        TBuffer outEnc, outDec;
+        NStaticCodecExample::Encode(outEnc, letov, dv);
+        NStaticCodecExample::Decode(outDec, TStringBuf{outEnc.data(), outEnc.size()});
+
+        UNIT_ASSERT_VALUES_EQUAL(outEnc.Size(), expectedSize);
+        UNIT_ASSERT_EQUAL(TStringBuf(outDec.data(), outDec.size()), letov);
+    }
+
+    void TestUsage() {
+        DoTestUsage(NStaticCodecExample::DV_HUFF_20160707, 18u);
+        DoTestUsage(NStaticCodecExample::DV_SA_HUFF_20160707, 22u);
+    }
+};
+
+UNIT_TEST_SUITE_REGISTRATION(TStaticCodecUsageTest)
diff --git a/library/cpp/codecs/static/ut/ya.make b/library/cpp/codecs/static/ut/ya.make
new file mode 100644
index 0000000000..b9116097d8
--- /dev/null
+++ b/library/cpp/codecs/static/ut/ya.make
@@ -0,0 +1,14 @@
+UNITTEST_FOR(library/cpp/codecs/static)
+
+OWNER(velavokr)
+
+SRCS(
+    builder_ut.cpp
+    static_ut.cpp
+)
+
+PEERDIR(
+    library/cpp/codecs/static/example
+)
+
+END()
diff --git a/library/cpp/codecs/static/ya.make b/library/cpp/codecs/static/ya.make
new file mode 100644
index 0000000000..00e00fd8d4
--- /dev/null
+++ b/library/cpp/codecs/static/ya.make
@@ -0,0 +1,18 @@
+LIBRARY()
+
+OWNER(velavokr)
+
+SRCS(
+    builder.cpp
+    static_codec_info.proto
+    static.cpp
+)
+
+PEERDIR(
+    library/cpp/codecs
+    library/cpp/archive
+    library/cpp/svnversion
+    util/draft
+)
+
+END()