1 /*

     2  * Copyright (c) 2014, 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 <windows.h>

    27 

    28 #include "jni_util.h"

    29 #include "jlong.h"

    30 #include "jdk_internal_jimage_concurrent_ConcurrentPReader.h"

    31 

    32 static jfieldID handle_fdID;

    33 

    34 JNIEXPORT void JNICALL

    35 Java_jdk_internal_jimage_concurrent_ConcurrentPReader_initIDs(JNIEnv *env, jclass clazz)

    36 {

    37     CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor"));

    38     CHECK_NULL(handle_fdID = (*env)->GetFieldID(env, clazz, "handle", "J"));

    39 }

    40 

    41 JNIEXPORT jint JNICALL

    42 Java_jdk_internal_jimage_concurrent_ConcurrentPReader_pread(JNIEnv *env, jclass clazz,

    43                                                             jobject fdo, jlong address,

    44                                                             jint len, jlong offset)

    45 {

    46     OVERLAPPED ov;

    47     DWORD nread;

    48     BOOL result;

    49 

    50     jlong handle = (*env)->GetLongField(env, fdo, handle_fdID);

    51     void *buf = (void *)jlong_to_ptr(address);

    52 

    53     ZeroMemory(&ov, sizeof(ov));

    54     ov.Offset = (DWORD)offset;

    55     ov.OffsetHigh = (DWORD)(offset >> 32);

    56 

    57     result = ReadFile(handle, (LPVOID)buf, len, &nread, &ov);

    58     if (result == 0) {

    59         JNU_ThrowIOExceptionWithLastError(env, "ReadFile failed");

    60     }

    61 

    62     return nread;

    63 }

    64