Adler32.c revision 12677:a4299d47bd00 
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 "jni.h"
31#include "jni_util.h"
32#include "jlong.h"
33#include <zlib.h>
34
35#include "java_util_zip_Adler32.h"
36
37JNIEXPORT jint JNICALL
38Java_java_util_zip_Adler32_update(JNIEnv *env, jclass cls, jint adler, jint b)
39{
40    Bytef buf[1];
41
42    buf[0] = (Bytef)b;
43    return adler32(adler, buf, 1);
44}
45
46JNIEXPORT jint JNICALL
47Java_java_util_zip_Adler32_updateBytes(JNIEnv *env, jclass cls, jint adler,
48                                       jarray b, jint off, jint len)
49{
50    Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
51    if (buf) {
52        adler = adler32(adler, buf + off, len);
53        (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
54    }
55    return adler;
56}
57
58
59JNIEXPORT jint JNICALL
60Java_java_util_zip_Adler32_updateByteBuffer(JNIEnv *env, jclass cls, jint adler,
61                                       jlong address, jint off, jint len)
62{
63    Bytef *buf = (Bytef *)jlong_to_ptr(address);
64    if (buf) {
65        adler = adler32(adler, buf + off, len);
66    }
67    return adler;
68}
69