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/*
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* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <windows.h>
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#include "jni_util.h"
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#include "jlong.h"
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#include "jdk_internal_jimage_concurrent_ConcurrentPReader.h"
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static jfieldID handle_fdID;
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JNIEXPORT void JNICALL
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Java_jdk_internal_jimage_concurrent_ConcurrentPReader_initIDs(JNIEnv *env, jclass clazz)
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{
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CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor"));
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CHECK_NULL(handle_fdID = (*env)->GetFieldID(env, clazz, "handle", "J"));
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}
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JNIEXPORT jint JNICALL
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Java_jdk_internal_jimage_concurrent_ConcurrentPReader_pread(JNIEnv *env, jclass clazz,
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jobject fdo, jlong address,
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jint len, jlong offset)
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{
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OVERLAPPED ov;
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DWORD nread;
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BOOL result;
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HANDLE handle = (HANDLE)(*env)->GetLongField(env, fdo, handle_fdID);
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void *buf = (void *)jlong_to_ptr(address);
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ZeroMemory(&ov, sizeof(ov));
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ov.Offset = (DWORD)offset;
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ov.OffsetHigh = (DWORD)(offset >> 32);
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result = ReadFile(handle, (LPVOID)buf, len, &nread, &ov);
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if (result == 0) {
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JNU_ThrowIOExceptionWithLastError(env, "ReadFile failed");
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}
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return nread;
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}
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