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.CRC32
28 */
29
30 #include <nativehelper/JNIHelp.h>
31 #include "jni.h"
32 #include "jni_util.h"
33 #include <zlib.h>
34
35
36 #define NATIVE_METHOD(className, functionName, signature) \
37 { #functionName, signature, (void*)(className ## _ ## functionName) }
38
39 JNIEXPORT jint JNICALL
CRC32_update(JNIEnv * env,jclass cls,jint crc,jint b)40 CRC32_update(JNIEnv *env, jclass cls, jint crc, jint b)
41 {
42 Bytef buf[1];
43
44 buf[0] = (Bytef)b;
45 return crc32(crc, buf, 1);
46 }
47
48 JNIEXPORT jint JNICALL
CRC32_updateBytes(JNIEnv * env,jclass cls,jint crc,jarray b,jint off,jint len)49 CRC32_updateBytes(JNIEnv *env, jclass cls, jint crc,
50 jarray b, jint off, jint len)
51 {
52 Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
53 if (buf) {
54 crc = crc32(crc, buf + off, len);
55 (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
56 }
57 return crc;
58 }
59
60 JNIEXPORT jint JNICALL
ZIP_CRC32(jint crc,const jbyte * buf,jint len)61 ZIP_CRC32(jint crc, const jbyte *buf, jint len)
62 {
63 return crc32(crc, (Bytef*)buf, len);
64 }
65
66 JNIEXPORT jint JNICALL
CRC32_updateByteBuffer(JNIEnv * env,jclass cls,jint crc,jlong address,jint off,jint len)67 CRC32_updateByteBuffer(JNIEnv *env, jclass cls, jint crc,
68 jlong address, jint off, jint len)
69 {
70 Bytef *buf = (Bytef *)jlong_to_ptr(address);
71 if (buf) {
72 crc = crc32(crc, buf + off, len);
73 }
74 return crc;
75 }
76
77 static JNINativeMethod gMethods[] = {
78 NATIVE_METHOD(CRC32, update, "(II)I"),
79 NATIVE_METHOD(CRC32, updateBytes, "(I[BII)I"),
80 NATIVE_METHOD(CRC32, updateByteBuffer, "(IJII)I"),
81 };
82
register_java_util_zip_CRC32(JNIEnv * env)83 void register_java_util_zip_CRC32(JNIEnv* env) {
84 jniRegisterNativeMethods(env, "java/util/zip/CRC32", gMethods, NELEM(gMethods));
85 }
86