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* Copyright (c) 2018, Howard Butler (howard@hobu.co)
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#include <pdal/pdal_test_main.hpp>

#include <random>

#include <pdal/compression/ZstdCompression.hpp>

using namespace pdal;

TEST(Compression, zstd)
{
    std::default_random_engine generator;
    std::uniform_int_distribution<int> dist((std::numeric_limits<int>::min)());

    // Choosing a size that isn't a multiple of the internal buffer.
    // Trying to make something that compresses reasonably well.
    std::vector<int> orig(1000357);
    int val = dist(generator);
    for (size_t i = 0; i < orig.size(); ++i)
    {
        orig[i] = val++;
        if (i % 100 == 0)
            val = dist(generator);
    }

    std::vector<char> compressed;
    auto cb = [&compressed](char *buf, size_t bufsize)
    {
        static size_t total = 0;
        compressed.insert(compressed.end(), buf, buf + bufsize);
        total += bufsize;
    };

    size_t s = orig.size() * sizeof(int);
    char *sp = reinterpret_cast<char *>(orig.data());
    ZstdCompressor compressor(cb);
    compressor.compress(sp, s);
    compressor.done();

    auto verifier = [&sp](char *buf, size_t bufsize)
    {
        EXPECT_EQ(memcmp(buf, sp, bufsize), 0);
        sp += bufsize;
    };

    ZstdDecompressor decompressor(verifier);
    decompressor.decompress(compressed.data(), compressed.size());
    decompressor.done();
}

