Use zlib-ng backend for flate2 by default

Still allow disabling the feature to avoid the cmake dependency.

Cargo.lock

@@ -105,6 +105,15 @@ dependencies = [
  "os_str_bytes",
 ]
 
+[[package]]
+name = "cmake"
+version = "0.1.49"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db34956e100b30725f2eb215f90d4871051239535632f84fea3bc92722c66b7c"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.3.2"
@@ -180,6 +189,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8a2db397cb1c8772f31494cb8917e48cd1e64f0fa7efac59fbd741a0a8ce841"
 dependencies = [
  "crc32fast",
+ "libz-ng-sys",
  "miniz_oxide",
 ]
 
@@ -241,6 +251,16 @@ version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
 
+[[package]]
+name = "libz-ng-sys"
+version = "1.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4399ae96a9966bf581e726de86969f803a81b7ce795fcd5480e640589457e0f2"
+dependencies = [
+ "cmake",
+ "libc",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.1.4"

Cargo.toml

@@ -19,3 +19,7 @@ itertools = "0.10.5"
 num-integer = "0.1.45"
 serde = "1.0.152"
 zstd = "0.12.3"
+
+[features]
+default = ["zlib-ng"]
+zlib-ng = ["flate2/zlib-ng"]

TODO.md

@@ -5,4 +5,3 @@
 - To check:
   - fastnbt borrow
   - fastnbt from_reader
-  - flate2 backends