#3718, #3717: Add check for SSE 4.2 and PCLMUL support to native zlib

native/src/main/c/NativeCompressImpl.c

@@ -3,6 +3,7 @@
 
 #include <zlib.h>
 #include "shared.h"
+#include "cpuid_helper.h"
 #include "net_md_5_bungee_jni_zlib_NativeCompressImpl.h"
 
 typedef unsigned char byte;
@@ -26,6 +27,10 @@ jint throwException(JNIEnv *env, const char* message, int err) {
     return (*env)->Throw(env, throwable);
 }
 
+JNIEXPORT jboolean JNICALL Java_net_md_15_bungee_jni_zlib_NativeCompressImpl_checkSupported(JNIEnv* env, jobject obj) {
+    return (jboolean) checkCompressionNativesSupport();
+}
+
 void JNICALL Java_net_md_15_bungee_jni_zlib_NativeCompressImpl_reset(JNIEnv* env, jobject obj, jlong ctx, jboolean compress) {
     z_stream* stream = (z_stream*) ctx;
     int ret = (compress) ? deflateReset(stream) : inflateReset(stream);

native/src/main/c/cpuid_helper.h

@@ -0,0 +1,22 @@
+// Header to check for SSE 4.2 support in compression natives
+// GCC only!
+
+#ifndef _INCLUDE_CPUID_HELPER_H
+#define _INCLUDE_CPUID_HELPER_H
+
+#include <stdbool.h>
+#include <cpuid.h>
+
+static inline bool checkCompressionNativesSupport() {
+    unsigned int eax;
+    unsigned int ebx;
+    unsigned int ecx; 
+    unsigned int edx;
+    if(__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
+        return (ecx & bit_PCLMUL) != 0 && (ecx & bit_SSE4_2) != 0;
+    }else {
+        return false;
+    }
+}
+
+#endif // _INCLUDE_CPUID_HELPER_H

native/src/main/c/net_md_5_bungee_jni_zlib_NativeCompressImpl.h

@@ -15,6 +15,14 @@ extern "C" {
 JNIEXPORT void JNICALL Java_net_md_15_bungee_jni_zlib_NativeCompressImpl_initFields
   (JNIEnv *, jclass);
 
+/*
+ * Class:     net_md_5_bungee_jni_zlib_NativeCompressImpl
+ * Method:    checkSupported
+ * Signature: ()Z
+ */
+JNIEXPORT jboolean JNICALL Java_net_md_15_bungee_jni_zlib_NativeCompressImpl_checkSupported
+  (JNIEnv *, jobject);
+
 /*
  * Class:     net_md_5_bungee_jni_zlib_NativeCompressImpl
  * Method:    end