1 /*
2 * Copyright (c) 1997, 2018, 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 "jni.h"
31 #include "jlong.h"
32 #include <zlib.h>
33
34 JNIEXPORT jint JNICALL
Java_java_util_zip_CRC32_update(jint crc,jint b)35 Java_java_util_zip_CRC32_update(jint crc, jint b)
36 {
37 Bytef buf[1];
38
39 buf[0] = (Bytef)b;
40 return crc32(crc, buf, 1);
41 }
42
43 JNIEXPORT jint JNICALL
Java_java_util_zip_CRC32_updateBytes0(JNIEnv * env,jclass cls,jint crc,jarray b,jint off,jint len)44 Java_java_util_zip_CRC32_updateBytes0(JNIEnv *env, jclass cls, jint crc,
45 jarray b, jint off, jint len)
46 {
47 Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
48 if (buf) {
49 crc = crc32(crc, buf + off, len);
50 (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
51 }
52 return crc;
53 }
54
55 JNIEXPORT jint
ZIP_CRC32(jint crc,const jbyte * buf,jint len)56 ZIP_CRC32(jint crc, const jbyte *buf, jint len)
57 {
58 return crc32(crc, (Bytef*)buf, len);
59 }
60
61 JNIEXPORT jint JNICALL
Java_java_util_zip_CRC32_updateByteBuffer0(JNIEnv * env,jclass cls,jint crc,jlong address,jint off,jint len)62 Java_java_util_zip_CRC32_updateByteBuffer0(JNIEnv *env, jclass cls, jint crc,
63 jlong address, jint off, jint len)
64 {
65 Bytef *buf = (Bytef *)jlong_to_ptr(address);
66 if (buf) {
67 crc = crc32(crc, buf + off, len);
68 }
69 return crc;
70 }
71
72 // Android-changed: register native methods.
73 #include <nativehelper/JNIHelp.h>
74 #define NATIVE_METHOD(className, functionName, signature) \
75 { #functionName, signature, (void*)(className ## _ ## functionName) }
76
77 static JNINativeMethod gMethods[] = {
78 NATIVE_METHOD(Java_java_util_zip_CRC32, update, "(II)I"),
79 NATIVE_METHOD(Java_java_util_zip_CRC32, updateBytes0, "(I[BII)I"),
80 NATIVE_METHOD(Java_java_util_zip_CRC32, updateByteBuffer0, "(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