1 /*
   2  * Copyright (c) 2005, 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 #include "jni.h"
  27 #include "jni_util.h"
  28 #include "jvm.h"
  29 #include "nio.h"
  30 #include "nio_util.h"
  31 #include "sun_nio_ch_FileKey.h"
  32 
  33 static jfieldID key_volumeSN;    /* id for FileKey.dwVolumeSerialNumber */
  34 static jfieldID key_indexHigh;   /* id for FileKey.nFileIndexHigh */
  35 static jfieldID key_indexLow;    /* id for FileKey.nFileIndexLow */
  36 
  37 
  38 JNIEXPORT void JNICALL
  39 Java_sun_nio_ch_FileKey_initIDs(JNIEnv *env, jclass clazz)
  40 {
  41     key_volumeSN = (*env)->GetFieldID(env, clazz, "dwVolumeSerialNumber", "J");
  42     key_indexHigh = (*env)->GetFieldID(env, clazz, "nFileIndexHigh", "J");
  43     key_indexLow = (*env)->GetFieldID(env, clazz, "nFileIndexLow", "J");
  44 }
  45 
  46 
  47 JNIEXPORT void JNICALL
  48 Java_sun_nio_ch_FileKey_init(JNIEnv *env, jobject this, jobject fdo)
  49 {
  50     HANDLE fileHandle = (HANDLE)(handleval(env, fdo));
  51     BOOL result;
  52     BY_HANDLE_FILE_INFORMATION fileInfo;
  53 
  54     result = GetFileInformationByHandle(fileHandle, &fileInfo);
  55     if (result) {
  56         (*env)->SetLongField(env, this, key_volumeSN, fileInfo.dwVolumeSerialNumber);
  57         (*env)->SetLongField(env, this, key_indexHigh, fileInfo.nFileIndexHigh);
  58         (*env)->SetLongField(env, this, key_indexLow, fileInfo.nFileIndexLow);
  59     } else {
  60         JNU_ThrowIOExceptionWithLastError(env, "GetFileInformationByHandle failed");
  61     }
  62 }