Simple ZLIB utility functions.

zlib-utils.cpp

#include <vector>

// https://github.com/richgel999/miniz (MIT)
#include <miniz.h>

static std::vector<uint8_t> zlib_compress(const void *data, size_t size) {
  uLongf compressed_size = compressBound(size);
  std::vector<uint8_t> compressed(compressed_size);

  int res = compress(compressed.data(), &compressed_size, (const unsigned char *)data, size);
  if (res != Z_OK) {
    return {};
  }

  compressed.resize(compressed_size);
  return compressed;
}

static std::vector<uint8_t> zlib_decompress(const void *data, size_t size) {
  std::vector<uint8_t> decompressed(size * 2);
  uLongf decompressed_size = decompressed.size();

  int res;
  while ((res = uncompress(decompressed.data(),
            &decompressed_size,
            (const unsigned char *)data,
            size)) == Z_BUF_ERROR) {
    decompressed_size *= 2;
    decompressed.resize(decompressed_size);
  }

  if (res != Z_OK) {
    return {};
  }

  decompressed.resize(decompressed_size);
  return decompressed;
}