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      1 /*
      2  * Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved.
      3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      4  *
      5  * This code is free software; you can redistribute it and/or modify it
      6  * under the terms of the GNU General Public License version 2 only, as
      7  * published by the Free Software Foundation.  Oracle designates this
      8  * particular file as subject to the "Classpath" exception as provided
      9  * by Oracle in the LICENSE file that accompanied this code.
     10  *
     11  * This code is distributed in the hope that it will be useful, but WITHOUT
     12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     14  * version 2 for more details (a copy is included in the LICENSE file that
     15  * accompanied this code).
     16  *
     17  * You should have received a copy of the GNU General Public License version
     18  * 2 along with this work; if not, write to the Free Software Foundation,
     19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     20  *
     21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * questions.
     24  */
     25 
     26 /*
     27  * Native method support for java.util.zip.Adler32
     28  */
     29 
     30 #include "JNIHelp.h"
     31 #include "jni.h"
     32 #include "jni_util.h"
     33 #include <zlib.h>
     34 
     35 
     36 
     37 #define NATIVE_METHOD(className, functionName, signature) \
     38 { #functionName, signature, (void*)(Java_java_util_zip_ ## className ## _ ## functionName) }
     39 
     40 JNIEXPORT jint JNICALL
     41 Java_java_util_zip_Adler32_update(JNIEnv *env, jclass cls, jint adler, jint b)
     42 {
     43     Bytef buf[1];
     44 
     45     buf[0] = (Bytef)b;
     46     return adler32(adler, buf, 1);
     47 }
     48 
     49 JNIEXPORT jint JNICALL
     50 Java_java_util_zip_Adler32_updateBytes(JNIEnv *env, jclass cls, jint adler,
     51                                        jarray b, jint off, jint len)
     52 {
     53     Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
     54     if (buf) {
     55         adler = adler32(adler, buf + off, len);
     56         (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
     57     }
     58     return adler;
     59 }
     60 
     61 JNIEXPORT jint JNICALL
     62 Java_java_util_zip_Adler32_updateByteBuffer(JNIEnv *env, jclass cls, jint adler,
     63                                             jlong address, jint off, jint len)
     64 {
     65     Bytef *buf = (Bytef *)jlong_to_ptr(address);
     66     if (buf) {
     67         adler = adler32(adler, buf + off, len);
     68     }
     69     return adler;
     70 }
     71 
     72 static JNINativeMethod gMethods[] = {
     73   NATIVE_METHOD(Adler32, update, "(II)I"),
     74   NATIVE_METHOD(Adler32, updateBytes, "(I[BII)I"),
     75   NATIVE_METHOD(Adler32, updateByteBuffer, "(IJII)I"),
     76 };
     77 
     78 void register_java_util_zip_Adler32(JNIEnv* env) {
     79   jniRegisterNativeMethods(env, "java/util/zip/Adler32", gMethods, NELEM(gMethods));
     80 }
     81