1# Maintaining zlib 2 3This copy of zlib comes from the Chromium team's zlib fork which incorporated 4performance improvements not currently available in standard zlib. 5 6## Updating zlib 7 8Update zlib: 9```bash 10git clone https://chromium.googlesource.com/chromium/src/third_party/zlib 11cp deps/zlib/zlib.gyp deps/zlib/win32/zlib.def deps 12rm -rf deps/zlib zlib/.git 13mv zlib deps/ 14mv deps/zlib.gyp deps/zlib/ 15mkdir deps/zlib/win32 16mv deps/zlib.def deps/zlib/win32 17sed -i -- 's_^#include "chromeconf.h"_//#include "chromeconf.h"_' deps/zlib/zconf.h 18``` 19 20Check that Node.js still builds and tests. 21 22It may be necessary to update deps/zlib/zlib.gyp if any significant changes have 23occurred upstream. 24 25## Committing zlib 26 27Add zlib: `git add --all deps/zlib` 28 29Commit the changes with a message like 30```text 31deps: update zlib to upstream d7f3ca9 32 33Updated as described in doc/guides/maintaining-zlib.md. 34``` 35