ydb/library/cpp/codecs/ut/float_huffman_ut.cpp

#include <library/cpp/codecs/float_huffman.h>

#include <library/cpp/testing/unittest/registar.h>

#include <util/stream/format.h>
#include <util/stream/output.h>
#include <library/cpp/string_utils/base64/base64.h>

namespace fh = NCodecs::NFloatHuff;

Y_UNIT_TEST_SUITE(FloatHuffmanTest) {
    static const float Factors[] = {
        0.340582, 0.000974026, 0.487168, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0.411765, 0.921569,
        0.00390625, 0.109371, 0, 1, 0, 0, 0, 0, 0.523322, 0, 1, 0, 0, 0, 0, 0.285714, 1,
        0.008253, 1, 0, 0, 0.00993935, 0.450213, 0.000974026, 1, 1, 1, 1, 0, 0, 0.20564,
        0.97561, 0.913896, 1, 1, 0, 1, 0, 0, 0.5, 0, 0, 0, 0.1, 1, 0, 0, 0, 0, 0, 0.450923,
        0, 0.5, 0, 0, 0.20564, 0, 0.5, 0, 0, 0.20564, 0, 0, 0.0313726, 0, 1, 1, 1, 0.363636,
        0.5, 0.686073, 0.45121, 0.00574382, 0.366166, 0.413295, 1, 1, 1, 0, 0, 0, 0, 0.160784,
        0, 0.937255, 0.537255, 0.133333, 0, 0, 0, 0, 0.00392157, 0, 0.333333, 0.027451, 0.0156863,
        1, 0.105882, 1, 0.00220908, 0.000112501, 0.0111262, 0.102384, 0.00140808, 0.123581,
        0.29308, 6.57282e-06, 0.00489498, 2.10209e-05, 0.00140559, 5.907e-06, 0, 0.559322,
        0.559322, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0.794765, 0,
        0.352648, 0.225904, 1, 0.047619, 0.0107276, 0.399461, 0.0304838, 0.292932, 0.00969929,
        0, 0, 0.886904, 0.714693, 0, 0.00223213, 0.000544069, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0.00507403, 0, 0, 0, 0, 0, 0.875, 0, 0, 1, 1, 1, 0, 0.20564, 0, 0.00176048, 0,
        0.000440121, 0, 0, 0, 0.000974026, 0.487168, 0, 0, 0.533333, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 1, 0, 0, 1, 0, 0, 0.723187, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 1, 0, 0.206882, 0.00483367, 0.792983, 0.00126106, 1, 0.0313726, 0.470588,
        0.254902, 0.188235, 0.188235, 0.388235, 0.164706, 0, 0.870588, 0.843137, 0.635294,
        0.384314, 0.384314, 0.643137, 0, 0, 0, 0, 0, 0, 0, 0, 0.541176, 0, 0.541176, 0, 0,
        0.0532634, 1, 0, 0, 0, 0.015044, 1, 0, 1, 1, 1, 0.47451, 0.329412, 0.964706, 0, 0,
        0, 0, 0, 0.5, 0, 0, 0, 0, 0, 0, 0.0941176, 0.970588, 0.970588, 0, 0.970588, 0.97561,
        0, 0.0431373, 0.47451, 0.329412, 0.964706, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0.231373, 0.00392157, 0, 0, 0, 0.054902, 0, 0,
        1, 0, 0, 0.0235294, 0, 1, 0, 0, 0, 0, 0.34902, 0.0352941, 0.925379, 0.623681, 0,
        0.954543, 0, 0, 0.00102756, 0.709804, 0.498039, 0.0901961, 0.631373, 0.847059, 0.270588,
        0.0156863, 0.133333, 0.980392, 1e-12, 1e-12, 1e-12, 1e-12, 0.497159, 0, 0.407487,
        0, 0, 0, 0.00392157, 0.00202156, 0.046875, 0.187159, 0.046875, 0.15625, 0.434232,
        0.15625, 0, 2.95083e-07, 0.20564, 0.20564, 0.97561, 0.913896, 0, 0, 0, 0, 0, 0, 0.00784314,
        0, 0.695525, 1, 0.07205, 0, 0, 0.176471, 0, 0, 0, 1, 1, 0.98, 0.01, 0.01, 0, 0.00690702,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.29078, 0.29078, 1, 0, 0, 0, 0, 0.192157, 0.188235,
        0.0941176, 0, 0.0313726, 0, 0.141176, 0.207843, 0.0901961, 0.00784314, 0.0784314,
        0, 0, 0, 0, 0, 0.203922, 0.0196078, 0.34902, 0.0235294, 0.0980392, 0.164706, 0.133333,
        0.368627, 0, 0.0941176, 0, 1, 0.313726, 0, 0, 0.433582, 0.384508, 0.0532186, 0.0833333,
        0.01609, 0, 1, 0, 0, 0, 0.0666667, 0, 0, 0, 0, 1, 0, 0.564706, 0.501961, 0, 0, 0,
        0, 0, 0.0516447, 0.000173065, 0, 0, 0, 0, 0, 0, 0, 0.996309, 0, 0, 0.00392157, 1,
        0, 0.01, 0, 0, 0, 0, 0, 0.439505, 0.206882, 0.206882, 0.260891, 0, 0.875, 0, 0, 0,
        0, 0, 0.185657, 1, 1, 0, 0, 0, 0.0332647, 0.206106, 0.0688878, 0.239216, 0, 0, 0,
        0, 0.054902, 0, 0.101961, 0.160784, 0.180392, 0, 0.737828, 0, 0, 0.875, 0.0142566,
        0, 0.662745, 1, 0, 0, 0, 0.225806, 0.99992, 0.631373, 0.00392157, 1, 0, 0.143647,
        0.00270085, 1, 0.231482, 0.246735, 0.0428062, 0, 0, 1, 0, 0.186441, 0.0115358, 0,
        0.221762, 0, 0.2, 0, 0.0156863, 0, 0, 0, 0.976471, 0, 0.231373, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0.00392157, 0.00392157, 0.0666667, 0, 0, 0, 0, 0.0117647, 0.580392, 0.98737,
        1, 1, 1, 0, 0, 0, 0.153, 0.847, 0.931373, 0.94697, 0.94697, 0, 0.946294, 0.408118,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0.99992, 0.97561, 0, 0, 0, 0, 0, 0,
        0.274677, 0.153017, 0, 0.642356, 0, 0, 0.1, 0, 0, 0, 0, 0.327944, 0.327944, 0, 0,
        0.815686, 0, 0, 0, 0, 0.206106, 0.439126, 0, 0, 0, 0, 0, 1, 1, 1, 0.00392157, 0.232788,
        0.232465, 0.999899, 0.00309296, 0.0636097, 0.445954, 0.156863, 0, 0, 0, 0, 0, 0,
        0.3796, 0.0784, 0.0651664, 0, 0, 0.254902, 0.266667, 1, 0, 0, 0, 0, 0, 0.596073,
        0.517876, 0.145833, 0.372549, 0, 0.991667, 0.602125, 0.161979, 0, 0, 0, 0, 0.0255146,
        0.947855, 0, 0, 0, 0, 0, 0, 0, 0, 0.847059, 0.679841, 0, 0.156863, 0, 0, 1, 0, 0,
        0, 0, 0.969697, 0, 0, 0.564706, 0, 0, 0, 0, 0, 1, 0.0367282, 0.0395228, 0, 0, 0,
        0, 0, 0.0470588, 0.141176, 0.054902, 0, 0, 0, 0};
    static const size_t FactorCount = Y_ARRAY_SIZE(Factors);

    static const ui8 CodedFactors[] = {
        0x24, 0x06, 0x73, 0xB5, 0xC7, 0x55, 0x7F, 0x3A, 0xB4, 0x70, 0xCB, 0xEF, 0xEE, 0xFE, 0xB3, 0x5B,
        0x5A, 0x1A, 0x93, 0x5F, 0x5F, 0x13, 0x00, 0x00, 0x10, 0x00, 0x3D, 0xEF, 0xFF, 0xEE, 0x0F, 0xDC,
        0xF0, 0xAB, 0x3F, 0x37, 0x92, 0x24, 0x5D, 0x5E, 0xDE, 0x1C, 0xF8, 0x12, 0x15, 0x5B, 0x84, 0x51,
        0x82, 0xE6, 0xF6, 0xB8, 0xEA, 0x4F, 0xC7, 0xDD, 0x7D, 0x2E, 0x4D, 0x4A, 0x21, 0xCA, 0xE0, 0xC4,
        0x2E, 0xEA, 0xD3, 0xBD, 0x0F, 0x00, 0x00, 0xE0, 0xDA, 0xCC, 0xCC, 0xEC, 0x9F, 0x61, 0xDF, 0xE6,
        0x01, 0x00, 0x00, 0xCC, 0xA5, 0x49, 0xA9, 0x00, 0x00, 0x00, 0xE6, 0xD2, 0xA4, 0xD4, 0xEA, 0x08,
        0x08, 0xD0, 0xDD, 0xF9, 0xE7, 0xA2, 0x0B, 0x00, 0x00, 0x40, 0xD8, 0x13, 0x7D, 0xFE, 0x13, 0x9C,
        0x9B, 0xA8, 0x36, 0xBC, 0x00, 0x90, 0x43, 0x6F, 0x97, 0x67, 0x9B, 0xD3, 0xEE, 0xFE, 0x84, 0x24,
        0x25, 0x89, 0xC9, 0xBF, 0x3F, 0x58, 0x4C, 0x4C, 0xCA, 0x21, 0x22, 0xBC, 0x39, 0x08, 0x08, 0x08,
        0x40, 0x7E, 0xAA, 0xAA, 0xCA, 0x75, 0x70, 0x70, 0xE9, 0x08, 0x08, 0xE8, 0x9A, 0x8A, 0x8D, 0xED,
        0xA6, 0x8D, 0x31, 0x04, 0x00, 0x96, 0xD0, 0x7D, 0x1D, 0x47, 0xAA, 0x2A, 0xD9, 0x28, 0xAD, 0x6B,
        0xB4, 0x9D, 0x7A, 0xC4, 0xD5, 0xD1, 0x04, 0x8C, 0x7E, 0x56, 0x3A, 0x58, 0x5A, 0x0C, 0x46, 0x6E,
        0x1B, 0x53, 0xC2, 0x0C, 0x14, 0x00, 0xAB, 0x60, 0x05, 0x7B, 0x63, 0x8D, 0x77, 0x70, 0x75, 0xAC,
        0x2F, 0x8D, 0xB1, 0x4D, 0xA0, 0xFB, 0xF2, 0x40, 0xF7, 0xE5, 0x7F, 0xDF, 0xDD, 0xFD, 0xBB, 0x1B,
        0xB8, 0x75, 0x9B, 0x47, 0x8E, 0xB4, 0x0C, 0x9B, 0x3A, 0x73, 0x25, 0x61, 0x18, 0x92, 0xD1, 0xC2,
        0x2F, 0x3C, 0x31, 0x64, 0x96, 0x2A, 0xB9, 0xF9, 0x7C, 0xD9, 0xAF, 0x94, 0xC5, 0xE9, 0x1E, 0x63,
        0x24, 0x0C, 0x03, 0x7F, 0xD8, 0x5B, 0xB3, 0x1D, 0x49, 0x02, 0x00, 0xAB, 0xFD, 0xE9, 0xA0, 0xF3,
        0xBF, 0xC9, 0x40, 0x64, 0x0A, 0xC0, 0xC7, 0x00, 0x00, 0x60, 0x77, 0xCF, 0xA5, 0x49, 0xA9, 0x16,
        0xFD, 0xD7, 0x5C, 0xA7, 0x55, 0x00, 0x36, 0xCF, 0xB9, 0x3D, 0xAE, 0xFA, 0xD3, 0xA1, 0x85, 0x5B,
        0xFE, 0x60, 0x10, 0x11, 0xFF, 0xF7, 0x7D, 0x38, 0x59, 0x24, 0xFF, 0xFF, 0xDF, 0x13, 0x1C, 0x7B,
        0xCA, 0x1C, 0x1E, 0xF3, 0x04, 0xC0, 0x78, 0x07, 0x58, 0x7B, 0xA2, 0x54, 0xAA, 0xE3, 0xEA, 0x08,
        0x08, 0xC0, 0x74, 0x78, 0x78, 0x88, 0x50, 0x50, 0xD8, 0x0A, 0x0C, 0xC4, 0x56, 0x60, 0x20, 0xF6,
        0x1A, 0x1B, 0x33, 0x16, 0x15, 0xA5, 0xB8, 0xED, 0xED, 0x22, 0xF5, 0xF5, 0x09, 0xA1, 0xA2, 0x42,
        0x67, 0x62, 0x62, 0x3A, 0x13, 0x13, 0x0B, 0xA0, 0xA4, 0xF4, 0x0F, 0x06, 0x15, 0x35, 0x18, 0x54,
        0xD4, 0x35, 0x57, 0x45, 0xCB, 0x2F, 0x39, 0xF6, 0xEC, 0xBC, 0xBB, 0x53, 0x5F, 0x5E, 0x9E, 0xB1,
        0xA8, 0xA8, 0x28, 0xDF, 0xDE, 0x3E, 0x00, 0x00, 0x80, 0x5F, 0x75, 0x81, 0x81, 0x51, 0x1D, 0x1E,
        0xA2, 0x3A, 0x3C, 0x8C, 0xEA, 0xF0, 0x10, 0x51, 0x06, 0x67, 0xED, 0x85, 0x85, 0xA1, 0xBE, 0xBC,
        0x3C, 0x63, 0x51, 0x51, 0x51, 0xBE, 0xBD, 0xFD, 0xFF, 0xFD, 0xFE, 0xCE, 0x85, 0x76, 0x36, 0x73,
        0x10, 0x10, 0x10, 0x80, 0xEB, 0x3A, 0x38, 0xD8, 0xBE, 0xD4, 0x05, 0x06, 0xEE, 0x4F, 0x60, 0x59,
        0x59, 0x65, 0x84, 0x84, 0xC0, 0x46, 0xCB, 0x19, 0x7F, 0x4C, 0xFD, 0xC8, 0x9D, 0x8B, 0xB6, 0x31,
        0xAF, 0x86, 0x3A, 0xF0, 0x6D, 0x6D, 0x11, 0xDF, 0xDF, 0x5F, 0x79, 0x71, 0x71, 0x85, 0xD4, 0xD0,
        0x10, 0xB9, 0xB1, 0x11, 0x1A, 0x54, 0x54, 0xE9, 0x08, 0x08, 0x48, 0x39, 0x44, 0x04, 0x84, 0xAF,
        0xAF, 0x96, 0x99, 0x97, 0x71, 0xC5, 0x32, 0xF3, 0x32, 0xAE, 0x58, 0x66, 0x5E, 0xC6, 0x15, 0xCB,
        0xCC, 0xCB, 0xB8, 0x42, 0xD0, 0x45, 0xFF, 0x1C, 0x11, 0x85, 0xBE, 0x39, 0x08, 0x08, 0x08, 0x80,
        0x69, 0xC2, 0x47, 0x00, 0x80, 0x02, 0x00, 0x00, 0x91, 0xD3, 0xF4, 0x47, 0x01, 0x00, 0x80, 0x08,
        0x00, 0x00, 0x42, 0xD4, 0x29, 0x6F, 0x02, 0x00, 0x80, 0xB4, 0xE6, 0x6B, 0x9E, 0x34, 0x5C, 0x9A,
        0x94, 0xE2, 0xD2, 0xA4, 0x14, 0xA2, 0x0C, 0x4E, 0xEC, 0xA2, 0x3E, 0x7F, 0x39, 0x08, 0x08, 0x10,
        0x6E, 0x6F, 0x10, 0xD7, 0x79, 0xC7, 0xC9, 0x09, 0x4D, 0x4B, 0x73, 0x77, 0x84, 0x14, 0xAE, 0x52,
        0xE1, 0x7A, 0x44, 0x2A, 0x5C, 0x8F, 0x34, 0x93, 0xA8, 0xC4, 0x01, 0xF8, 0x3F, 0x3D, 0xC2, 0x29,
        0xE9, 0x11, 0x4E, 0xE9, 0x4F, 0x67, 0x62, 0x22, 0xB6, 0x02, 0x03, 0xA9, 0x2E, 0x30, 0x70, 0x75,
        0x04, 0x04, 0xC8, 0x38, 0x48, 0x08, 0x32, 0x53, 0x53, 0x29, 0x2F, 0x2E, 0xAE, 0x1C, 0x04, 0x04,
        0x50, 0x52, 0x50, 0xD0, 0x4F, 0x77, 0x68, 0x28, 0x99, 0x08, 0x0A, 0x4A, 0x60, 0x59, 0x59, 0xA9,
        0x0B, 0x0C, 0xAC, 0xC7, 0xC8, 0xC8, 0x8C, 0x45, 0x45, 0xA1, 0x1C, 0x22, 0x02, 0x5D, 0x79, 0x79,
        0xAB, 0x2E, 0x30, 0x70, 0xA7, 0x2C, 0x28, 0xE8, 0xB4, 0xF3, 0xEF, 0x26, 0x8F, 0x37, 0xB1, 0xFE,
        0xEE, 0x67, 0xA9, 0xA9, 0xAA, 0xAA, 0x6C, 0x79, 0x1E, 0xEC, 0xD7, 0x46, 0x44, 0xC4, 0xF7, 0xF8,
        0x24, 0x24, 0x00, 0x42, 0x40, 0xF8, 0x5A, 0x96, 0x38, 0x65, 0x91, 0xF1, 0x6A, 0x72, 0xFE, 0x68,
        0xC3, 0xE1, 0x37, 0x07, 0x01, 0x01, 0x01, 0xF0, 0x52, 0xE1, 0x7A, 0xE4, 0xB3, 0xD9, 0x20, 0x9C,
        0xE0, 0xD8, 0x53, 0x04, 0xC7, 0x9E, 0x82, 0x02, 0x27, 0x2B, 0x06, 0x00, 0x00, 0x9F, 0xDE, 0x1C,
        0x3E, 0xEE, 0xD7, 0x48, 0x20, 0x04, 0xD2, 0x35, 0x4C, 0x29, 0x43, 0x45, 0x23, 0x15, 0xEA, 0xE9,
        0x5E, 0xD7, 0xC1, 0xC1, 0xAA, 0x3B, 0x34, 0x34, 0x21, 0x49, 0x49, 0xE8, 0x8A, 0x8B, 0x13, 0x66,
        0x12, 0xE7, 0x31, 0x00, 0x00, 0x90, 0x84, 0x94, 0x69, 0x05, 0xD4, 0xD4, 0xF4, 0x13, 0x36, 0xE7,
        0x0C, 0x09, 0xEB, 0xBF, 0x90, 0x1A, 0x1A, 0xE6, 0x20, 0x20, 0x20, 0x00, 0x9E, 0x33, 0x18, 0x13,
        0xA6, 0x2F, 0x40, 0x0C, 0x00, 0x4E, 0xCF, 0x84, 0x36, 0x6A, 0xA0, 0xF2, 0xA9, 0x63, 0xD5, 0xCB,
        0x9E, 0x64, 0xEA, 0x3E, 0xF2, 0x14, 0xA0, 0x27, 0x29, 0x2B, 0xC6, 0xB2, 0x99, 0x99, 0xA9, 0x74,
        0x04, 0x04, 0x3C, 0x0A, 0xD0, 0xCF, 0x5C, 0x68, 0x67, 0xFB, 0xDF, 0x1C, 0x04, 0x04, 0x04, 0xC0,
        0x1C, 0x04, 0x04, 0x04, 0x40, 0x1B, 0x11, 0x11, 0x5F, 0xEA, 0x02, 0x03, 0xE1, 0x92, 0x94, 0x84,
        0x90, 0x88, 0xD9, 0xDD, 0x4F, 0x04, 0x56, 0x0E, 0xD1, 0x9F, 0x1A, 0x31, 0x3B, 0x37, 0x47, 0xA0,
        0x6C, 0x82, 0x40, 0xD9, 0x24, 0x9A, 0x02, 0x12, 0x62, 0xD3, 0x43, 0xFF, 0xBF, 0x8F, 0x84, 0xF5,
        0x1F, 0x51, 0x06, 0xE7, 0x0F, 0xDD, 0x89, 0x32, 0xFB, 0x60, 0x39, 0x0A, 0x71, 0x71, 0xB4, 0x36,
        0x33, 0x33, 0x3F, 0x8F, 0xD0, 0x4F, 0x79, 0x84, 0x7E, 0xBA, 0xC8, 0x0C, 0x0D, 0x4F, 0xBA, 0x86,
        0x29, 0x82, 0x54, 0x83, 0x7F, 0x77, 0x37, 0x07, 0x01, 0x01, 0x01, 0xA0, 0xFE, 0x97, 0x1B, 0x9D,
        0x16, 0xDC, 0x90, 0x58, 0xFE, 0x9B, 0x42, 0xB3, 0x4A, 0x00, 0x68, 0x73, 0x91, 0x20, 0x2B, 0xA8,
        0xC8, 0x29, 0x0B, 0x0A, 0xF2, 0xD3, 0x5D, 0x4B, 0x58, 0x5D, 0x20, 0x41, 0xD5, 0xBE, 0xAE, 0x70,
        0x88, 0x50, 0x50, 0x20, 0x4A, 0x44, 0xF4, 0x8F, 0xF7, 0x60, 0x22, 0x30, 0x9C, 0x24, 0xFE, 0x54,
        0x55, 0xD0, 0xD7, 0xD7, 0x37, 0x1A, 0xEF, 0x6E, 0xBC, 0x9B, 0x44, 0x39, 0xDD, 0x5D, 0xF2, 0xF2,
        0x7F, 0x20, 0x1A, 0x81, 0x9A, 0xCA, 0xBF, 0xC8, 0x8D, 0x8D, 0xC2, 0x83, 0x82, 0xA7, 0x2C, 0x28,
        0xC8, 0xFE, 0x08, 0xC2, 0x07, 0xC7, 0x27, 0x21, 0xE1, 0xBB, 0x3E, 0xC1, 0x59, 0x68, 0xAA, 0x78,
        0xC8, 0x57, 0x5D, 0x60, 0x20, 0xC6, 0x41, 0x42, 0xE8, 0x3A, 0x38, 0xD8, 0x9B, 0xFF, 0xFF, 0xFF,
        0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
    static const size_t CodedSize = Y_ARRAY_SIZE(CodedFactors);
    static const TStringBuf CodedFactorsBuf(reinterpret_cast<const char*>(CodedFactors), CodedSize);

    void FillWithGarbage(float* factors, size_t count) {
        void* data = static_cast<void*>(factors);
        memset(data, 0xAA, sizeof(float) * count);
    }

    // Helper for dumping compressed values
    void PrintCompressed(const TVector<ui8>& codedFactors) {
        for (size_t i = 0; i < codedFactors.size(); ++i) {
            if (i % 0x10 == 0)
                Cerr << Endl;
            Cerr << Hex(codedFactors[i]) << ", ";
        }
        Cerr << Endl;
    }

    // Helper for dumping decompressed values
    void PrintDecompressed(const TVector<float>& factors) {
        TStringStream result;
        TStringStream line;

        for (size_t i = 0; i < factors.size(); ++i) {
            line << factors[i] << ", ";
            if (line.Str().size() > 80) {
                result << line.Str() << Endl;
                line.Clear();
            }
        }
        Cerr << result.Str() << Endl;
    }

    Y_UNIT_TEST(TestCompress) {
        const auto codedFactors = fh::Encode(Factors);
        UNIT_ASSERT_VALUES_EQUAL(codedFactors.size(), CodedSize);
        for (size_t i = 0; i < Min(codedFactors.size(), CodedSize); ++i)
            UNIT_ASSERT_VALUES_EQUAL((ui8)codedFactors[i], CodedFactors[i]);
        //PrintCompressed(codedFactors);
    }

    Y_UNIT_TEST(TestSimpleDecompress) {
        TVector<float> factors = fh::Decode(CodedFactorsBuf);
        UNIT_ASSERT_VALUES_EQUAL(factors.size(), FactorCount);
        for (size_t i = 0; i < Min(factors.size(), FactorCount); ++i)
            UNIT_ASSERT_VALUES_EQUAL(factors[i], Factors[i]);
        //PrintDecompressed(factors);
    }

    Y_UNIT_TEST(TestDecompressInParts) {
        float factors[FactorCount];
        FillWithGarbage(factors, FactorCount);
        fh::TDecoder decoder(CodedFactorsBuf);
        const size_t firstPack = 100;
        // unpack first pack
        UNIT_ASSERT_VALUES_EQUAL(decoder.Decode({factors, firstPack}), firstPack);
        // unpack all the rest
        UNIT_ASSERT_VALUES_EQUAL(decoder.Decode({factors + firstPack, FactorCount - firstPack}), FactorCount - firstPack);

        for (size_t i = 0; i < FactorCount; ++i)
            UNIT_ASSERT_VALUES_EQUAL(factors[i], Factors[i]);
        //PrintDecompressed(factors);
    }

    Y_UNIT_TEST(TestSkip) {
        float factors[FactorCount];
        FillWithGarbage(factors, FactorCount);
        fh::TDecoder decoder(CodedFactorsBuf);
        const size_t firstPack = 100;
        // unpack first pack
        UNIT_ASSERT_VALUES_EQUAL(decoder.Decode({factors, firstPack}), firstPack);
        // skip some factors
        const size_t skipCount = 60;
        UNIT_ASSERT_VALUES_EQUAL(decoder.Skip(skipCount / 2), skipCount / 2);
        // unpack all, except some factors in the end
        const auto toDecode = FactorCount - firstPack - skipCount;
        UNIT_ASSERT_VALUES_EQUAL(decoder.Decode({factors + firstPack, toDecode}), toDecode);
        UNIT_ASSERT_VALUES_EQUAL(decoder.Skip(skipCount / 2), skipCount / 2);
        for (size_t i = 0; i < FactorCount - skipCount; ++i) {
            size_t correctedI = i < firstPack ? i : i + skipCount / 2;
            UNIT_ASSERT_VALUES_EQUAL(factors[i], Factors[correctedI]);
        }
        //PrintDecompressed(factors);
    }

    Y_UNIT_TEST(TestDecompressForgedData) {
        // this coredumps without end-of-coded-stream check, see SEARCH-1156 for details
        TString brokenBase64Encoded =
            "NLjYltUWs5pqnd3d3f05Li4OAwCAEqrP6mv06jDt7PiAUVu7Y+PiMpuZmdzeM"
            "ArqOLxS2q4FKCII52dktcVs7y0zL+OKgeO9SOzEkFj7uPfFqqoCAAAAAADAtZ"
            "mZ2fdmICAgANQXhi1WVRUAAAAAAAAGjvcWq6oKAAAAAAAAA8d7qe4rV3Nxcd3"
            "d4ZfQZrETm3B+OxxB8bbnTPM5+qtbQ92mJ3fHPGj+iH5+8tzcnJuamry1tWUw"
            "MBD693f07+9+DQQEkIGAgIgPetzN5yEbAGxWpbCNxXK/0JGTKRz2KkIoR7aM";
        UNIT_ASSERT_EXCEPTION(
            fh::Decode(Base64Decode(brokenBase64Encoded)),
            yexception);
    }

    Y_UNIT_TEST(TestDecompressEmpty) {
        UNIT_ASSERT_EXCEPTION(fh::Decode({}), yexception);
    }
}