/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include <windows.h>

#include "jni.h"

#include "jni_util.h"

#include "jlong.h"

#include "nio.h"

#include "nio_util.h"

#include "sun_nio_ch_WindowsAsynchronousFileChannelImpl.h"

JNIEXPORT jint JNICALL

Java_sun_nio_ch_WindowsAsynchronousFileChannelImpl_readFile(JNIEnv* env, jclass this,

    jlong handle, jlong address, jint len, jlong offset, jlong ov)

{

    BOOL res;

    OVERLAPPED* lpOverlapped = (OVERLAPPED*)jlong_to_ptr(ov);

    lpOverlapped->Offset = (DWORD)offset;

    lpOverlapped->OffsetHigh = (DWORD)((long)(offset >> 32));

    lpOverlapped->hEvent = NULL;

    res = ReadFile((HANDLE) jlong_to_ptr(handle),

                   (LPVOID) jlong_to_ptr(address),

                   (DWORD)len,

                   NULL,

                   lpOverlapped);

    if (res == 0) {

        int error = GetLastError();

        if (error == ERROR_IO_PENDING)

            return IOS_UNAVAILABLE;

        if (error == ERROR_HANDLE_EOF)

            return IOS_EOF;

        JNU_ThrowIOExceptionWithLastError(env, "ReadFile failed");

        return IOS_THROWN;

    }

    return IOS_UNAVAILABLE;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_WindowsAsynchronousFileChannelImpl_writeFile(JNIEnv* env, jclass this,

    jlong handle, jlong address, jint len, jlong offset, jlong ov)

{

    BOOL res;

    OVERLAPPED* lpOverlapped = (OVERLAPPED*)jlong_to_ptr(ov);

    lpOverlapped->Offset = (DWORD)offset;

    lpOverlapped->OffsetHigh = (DWORD)((long)(offset >> 32));

    lpOverlapped->hEvent = NULL;

    res = WriteFile((HANDLE)jlong_to_ptr(handle),

                   (LPVOID) jlong_to_ptr(address),

                   (DWORD)len,

                   NULL,

                   lpOverlapped);

    if (res == 0) {

        int error = GetLastError();

        if (error == ERROR_IO_PENDING)

            return IOS_UNAVAILABLE;

        JNU_ThrowIOExceptionWithLastError(env, "WriteFile failed");

        return IOS_THROWN;

    }

    return IOS_UNAVAILABLE;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_WindowsAsynchronousFileChannelImpl_lockFile(JNIEnv *env, jobject this, jlong handle,

                                                            jlong pos, jlong size, jboolean shared, jlong ov)

{

    BOOL res;

    HANDLE h = jlong_to_ptr(handle);

    DWORD lowPos = (DWORD)pos;

    long highPos = (long)(pos >> 32);

    DWORD lowNumBytes = (DWORD)size;

    DWORD highNumBytes = (DWORD)(size >> 32);

    DWORD flags = (shared == JNI_TRUE) ? 0 : LOCKFILE_EXCLUSIVE_LOCK;

    OVERLAPPED* lpOverlapped = (OVERLAPPED*)jlong_to_ptr(ov);

    lpOverlapped->Offset = lowPos;

    lpOverlapped->OffsetHigh = highPos;

    lpOverlapped->hEvent = NULL;

    res = LockFileEx(h, flags, 0, lowNumBytes, highNumBytes, lpOverlapped);

    if (res == 0) {

        int error = GetLastError();

        if (error == ERROR_IO_PENDING) {

            return IOS_UNAVAILABLE;

        }

        JNU_ThrowIOExceptionWithLastError(env, "WriteFile failed");

        return IOS_THROWN;

    }

    return 0;

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_WindowsAsynchronousFileChannelImpl_close0(JNIEnv* env, jclass this,

    jlong handle)

{

    HANDLE h = (HANDLE)jlong_to_ptr(handle);

}