compat.gzip-hpp

// Behavioral test — compat.gzip-hpp compresses and decompresses through zlib.
//
// Round-trip alone would pass on a library that did nothing, so the test also
// asserts the gzip MAGIC on the compressed bytes and that a compressible
// payload actually shrinks. Both are answers only real deflate can give.
//
// It is also the link-time proof for the package's zlib dependency: every
// function called here bottoms out in `deflate`/`inflate`.
#include <gzip/compress.hpp>
#include <gzip/decompress.hpp>
#include <gzip/utils.hpp>

#include <cstdio>
#include <string>

int main() {
    std::string original;
    for (int i = 0; i < 200; ++i) original += "mcpp-index gzip round trip ";

    const std::string compressed = gzip::compress(original.data(), original.size());

    if (!gzip::is_compressed(compressed.data(), compressed.size())) {
// …