1/*
2 * Copyright (c) 1997, 2012, 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 "jlong.h"
34#include <zlib.h>
35
36
37
38#define NATIVE_METHOD(className, functionName, signature) \
39{ #functionName, signature, (void*)(Java_java_util_zip_ ## className ## _ ## functionName) }
40
41JNIEXPORT jint JNICALL
42Java_java_util_zip_Adler32_update(JNIEnv *env, jclass cls, jint adler, jint b)
43{
44    Bytef buf[1];
45
46    buf[0] = (Bytef)b;
47    return adler32(adler, buf, 1);
48}
49
50JNIEXPORT jint JNICALL
51Java_java_util_zip_Adler32_updateBytes(JNIEnv *env, jclass cls, jint adler,
52                                       jarray b, jint off, jint len)
53{
54    Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
55    if (buf) {
56        adler = adler32(adler, buf + off, len);
57        (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
58    }
59    return adler;
60}
61
62JNIEXPORT jint JNICALL
63Java_java_util_zip_Adler32_updateByteBuffer(JNIEnv *env, jclass cls, jint adler,
64                                            jlong address, jint off, jint len)
65{
66    Bytef *buf = (Bytef *)jlong_to_ptr(address);
67    if (buf) {
68        adler = adler32(adler, buf + off, len);
69    }
70    return adler;
71}
72
73static JNINativeMethod gMethods[] = {
74  NATIVE_METHOD(Adler32, update, "(II)I"),
75  NATIVE_METHOD(Adler32, updateBytes, "(I[BII)I"),
76  NATIVE_METHOD(Adler32, updateByteBuffer, "(IJII)I"),
77};
78
79void register_java_util_zip_Adler32(JNIEnv* env) {
80  jniRegisterNativeMethods(env, "java/util/zip/Adler32", gMethods, NELEM(gMethods));
81}
82