feature(simd): add simd-adler32 behind simd feature flag (#104)

thanks

Cargo.toml

@@ -38,6 +38,8 @@ build_stub_miniz = []
 no_c_export = []
 libc_stub = []
 
+simd = ['miniz_oxide/simd']
+
 [profile.dev]
 panic = "abort"
 

miniz_oxide/Cargo.toml

@@ -22,6 +22,7 @@ autocfg = "1.0"
 
 [dependencies]
 adler = { version = "1.0", default-features = false }
+simd-adler32 = { version = "0.3", default-features = false, optional = true }
 
 # Internal feature, only used when building as part of libstd, not part of the
 # stable interface of this crate.
@@ -30,8 +31,12 @@ alloc = { version = '1.0.0', optional = true, package = 'rustc-std-workspace-all
 compiler_builtins = { version = '0.1.2', optional = true }
 
 [features]
+default = []
+
 # Internal feature, only used when building as part of libstd, not part of the
 # stable interface of this crate.
-rustc-dep-of-std = ['core', 'alloc', 'compiler_builtins', 'adler/rustc-dep-of-std']
+rustc-dep-of-std = ['core', 'alloc', 'compiler_builtins', 'adler/rustc-dep-of-std', 'simd-adler32/std']
 # This feature has no effect (See Frommi/miniz_oxide#95)
 no_extern_crate_alloc = []
+
+simd = ['simd-adler32']

miniz_oxide/src/shared.rs

@@ -1,5 +1,3 @@
-use adler::Adler32;
-
 #[doc(hidden)]
 pub const MZ_ADLER32_INIT: u32 = 1;
 
@@ -11,8 +9,17 @@ pub const HUFFMAN_LENGTH_ORDER: [u8; 19] = [
 ];
 
 #[doc(hidden)]
+#[cfg(not(feature = "simd"))]
 pub fn update_adler32(adler: u32, data: &[u8]) -> u32 {
-    let mut hash = Adler32::from_checksum(adler);
+    let mut hash = adler::Adler32::from_checksum(adler);
     hash.write_slice(data);
     hash.checksum()
 }
+
+#[doc(hidden)]
+#[cfg(feature = "simd")]
+pub fn update_adler32(adler: u32, data: &[u8]) -> u32 {
+    let mut hash = simd_adler32::Adler32::from_checksum(adler);
+    hash.write(data);
+    hash.finish()
+}