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 "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_updateBytes0(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_updateByteBuffer0(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 }