shangxinli commented on code in PR #1014:
URL: https://github.com/apache/iceberg-cpp/pull/1014#discussion_r4297617017
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src/iceberg/util/gzip_internal.cc:
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@@ -86,6 +87,60 @@ class ZlibImpl {
z_stream stream_;
};
+class ZlibDeflateImpl {
+ public:
+ ZlibDeflateImpl() { memset(&stream_, 0, sizeof(stream_)); }
+
+ ~ZlibDeflateImpl() {
+ if (initialized_) {
+ deflateEnd(&stream_);
+ }
+ }
+
+ Status Init() {
+ // Maximum window size, plus the offset that selects a gzip wrapper over
+ // the raw zlib one, so GZipDecompressor's auto-detection accepts it.
+ constexpr int kWindowBits = 15;
+ constexpr int kGzipWrapper = 16;
+ int ret = deflateInit2(&stream_, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+ kWindowBits | kGzipWrapper, 8, Z_DEFAULT_STRATEGY);
+ if (ret != Z_OK) {
+ return CompressError("deflateInit2 failed, result:{}", ret);
+ }
+ initialized_ = true;
+ return {};
+ }
+
+ Result<std::string> Compress(const std::string& data) {
Review Comment:
Bumping this - latent only because `Write()` builds a fresh compressor each
time, but the `Init()`/`Compress()` split invites reuse.
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