HADOOP-15859. ZStandardDecompressor.c mistakes a class for an instance. Contributed by Jason Lowe

(cherry picked from commit 9abda83947a5babfe5a650b3409ad952f6782105)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zstd/ZStandardCompressor.java

@@ -298,7 +298,7 @@ public class ZStandardCompressor implements Compressor {
   private native static void init(int level, long stream);
   private native int deflateBytesDirect(ByteBuffer src, int srcOffset,
       int srcLen, ByteBuffer dst, int dstLen);
-  private static native int getStreamSize();
+  private native static int getStreamSize();
   private native static void end(long strm);
   private native static void initIDs();
   public native static String getLibraryName();

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/zstd/ZStandardCompressor.c

@@ -139,7 +139,7 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompress
 }
 
 // Create the compression stream
-JNIEXPORT jlong JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_create (JNIEnv *env, jobject this) {
+JNIEXPORT jlong JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_create (JNIEnv *env, jclass clazz) {
     ZSTD_CStream* const stream =  dlsym_ZSTD_createCStream();
     if (stream == NULL) {
         THROW(env, "java/lang/InternalError", "Error creating the stream");
@@ -149,7 +149,7 @@ JNIEXPORT jlong JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompres
 }
 
 // Initialize the compression stream
-JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_init (JNIEnv *env, jobject this, jint level, jlong stream) {
+JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_init (JNIEnv *env, jclass clazz, jint level, jlong stream) {
     size_t result = dlsym_ZSTD_initCStream((ZSTD_CStream *) stream, level);
     if (dlsym_ZSTD_isError(result)) {
         THROW(env, "java/lang/InternalError", dlsym_ZSTD_getErrorName(result));
@@ -158,7 +158,7 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompress
 }
 
 // free the compression stream
-JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_end (JNIEnv *env, jobject this, jlong stream) {
+JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_end (JNIEnv *env, jclass clazz, jlong stream) {
     size_t result = dlsym_ZSTD_freeCStream((ZSTD_CStream *) stream);
     if (dlsym_ZSTD_isError(result)) {
         THROW(env, "java/lang/InternalError", dlsym_ZSTD_getErrorName(result));
@@ -227,7 +227,7 @@ JNIEXPORT jint Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_defla
 }
 
 JNIEXPORT jstring JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_getLibraryName
-(JNIEnv *env, jclass class) {
+(JNIEnv *env, jclass clazz) {
 #ifdef UNIX
     if (dlsym_ZSTD_isError) {
         Dl_info dl_info;
@@ -250,7 +250,7 @@ JNIEXPORT jstring JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompr
 
 // returns the max size of the recommended input and output buffers
 JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardCompressor_getStreamSize
-(JNIEnv *env, jobject this) {
+(JNIEnv *env, jclass clazz) {
     int x = (int) dlsym_ZSTD_CStreamInSize();
     int y = (int) dlsym_ZSTD_CStreamOutSize();
     return (x >= y) ? x : y;

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/zstd/ZStandardDecompressor.c

@@ -130,7 +130,7 @@ JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompre
     ZStandardDecompressor_remaining = (*env)->GetFieldID(env, clazz, "remaining", "I");
 }
 
-JNIEXPORT jlong JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_create(JNIEnv *env, jobject this) {
+JNIEXPORT jlong JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_create(JNIEnv *env, jclass clazz) {
     ZSTD_DStream * stream = dlsym_ZSTD_createDStream();
     if (stream == NULL) {
         THROW(env, "java/lang/InternalError", "Error creating stream");
@@ -139,17 +139,16 @@ JNIEXPORT jlong JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompr
     return (jlong) stream;
 }
 
-JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_init(JNIEnv *env, jobject this, jlong stream) {
+JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_init(JNIEnv *env, jclass clazz, jlong stream) {
     size_t result = dlsym_ZSTD_initDStream((ZSTD_DStream *) stream);
     if (dlsym_ZSTD_isError(result)) {
         THROW(env, "java/lang/InternalError", dlsym_ZSTD_getErrorName(result));
         return;
     }
-    (*env)->SetIntField(env, this, ZStandardDecompressor_remaining, 0);
 }
 
 
-JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_free(JNIEnv *env, jclass obj, jlong stream) {
+JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_free(JNIEnv *env, jclass clazz, jlong stream) {
     size_t result = dlsym_ZSTD_freeDStream((ZSTD_DStream *) stream);
     if (dlsym_ZSTD_isError(result)) {
         THROW(env, "java/lang/InternalError", dlsym_ZSTD_getErrorName(result));
@@ -209,10 +208,10 @@ JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompre
 
 // returns the max size of the recommended input and output buffers
 JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_zstd_ZStandardDecompressor_getStreamSize
-(JNIEnv *env, jclass obj) {
+(JNIEnv *env, jclass clazz) {
     int x = (int) dlsym_ZSTD_DStreamInSize();
     int y = (int) dlsym_ZSTD_DStreamOutSize();
     return (x >= y) ? x : y;
 }
 
-#endif //define HADOOP_ZSTD_LIBRARY
+#endif //define HADOOP_ZSTD_LIBRARY