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 "jni.h"
  31 #include "jni_util.h"
  32 #include <zlib.h>
  33 
  34 #include "java_util_zip_CRC32.h"
  35 
  36 JNIEXPORT jint JNICALL
  37 Java_java_util_zip_CRC32_update(JNIEnv *env, jclass cls, jint crc, jint b)
  38 {
  39     Bytef buf[1];
  40 
  41     buf[0] = (Bytef)b;
  42     return crc32(crc, buf, 1);
  43 }
  44 
  45 JNIEXPORT jint JNICALL
  46 Java_java_util_zip_CRC32_updateBytes(JNIEnv *env, jclass cls, jint crc,
  47                                      jarray b, jint off, jint len)
  48 {
  49     Bytef *buf = (*env)->GetPrimitiveArrayCritical(env, b, 0);
  50     if (buf) {
  51         crc = crc32(crc, buf + off, len);
  52         (*env)->ReleasePrimitiveArrayCritical(env, b, buf, 0);
  53     }
  54     return crc;
  55 }
  56 
  57 JNIEXPORT jint JNICALL
  58 ZIP_CRC32(jint crc, const jbyte *buf, jint len)
  59 {
  60     return crc32(crc, (Bytef*)buf, len);
  61 }
  62 
  63 JNIEXPORT jint JNICALL
  64 Java_java_util_zip_CRC32_updateByteBuffer(JNIEnv *env, jclass cls, jint crc,
  65                                           jlong address, jint off, jint len)
  66 {
  67     Bytef *buf = (Bytef *)jlong_to_ptr(address);
  68     if (buf) {
  69         crc = crc32(crc, buf + off, len);
  70     }
  71     return crc;
  72 }