/*

 * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

 * 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 <winsock2.h>

#include <io.h>

#include "jni.h"

#include "jni_util.h"

#include "jvm.h"

#include "jlong.h"

#include "nio.h"

#include "nio_util.h"

#include "net_util.h"

#include "sun_nio_ch_IOUtil.h"

/* field id for jlong 'handle' in java.io.FileDescriptor used for file fds */

static jfieldID handle_fdID;

/* field id for jint 'fd' in java.io.FileDescriptor used for socket fds */

static jfieldID fd_fdID;

JNIEXPORT jboolean JNICALL

Java_sun_security_provider_NativeSeedGenerator_nativeGenerateSeed

(JNIEnv *env, jclass clazz, jbyteArray randArray);

/**************************************************************

 * static method to store field IDs in initializers

 */

JNIEXPORT void JNICALL

Java_sun_nio_ch_IOUtil_initIDs(JNIEnv *env, jclass clazz)

{

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

    CHECK_NULL(fd_fdID = (*env)->GetFieldID(env, clazz, "fd", "I"));

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

}

/**************************************************************

 * IOUtil.c

 */

JNIEXPORT jboolean JNICALL

Java_sun_nio_ch_IOUtil_randomBytes(JNIEnv *env, jclass clazz,

                                  jbyteArray randArray)

{

    return

        Java_sun_security_provider_NativeSeedGenerator_nativeGenerateSeed(env,

                                                                    clazz,

                                                                    randArray);

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_IOUtil_iovMax(JNIEnv *env, jclass this)

{

    return 16;

}

jint

convertReturnVal(JNIEnv *env, jint n, jboolean reading)

{

    if (n > 0) /* Number of bytes written */

        return n;

    if (n == 0) {

        if (reading) {

            return IOS_EOF; /* EOF is -1 in javaland */

        } else {

            return 0;

        }

    }

    JNU_ThrowIOExceptionWithLastError(env, "Read/write failed");

    return IOS_THROWN;

}

jlong

convertLongReturnVal(JNIEnv *env, jlong n, jboolean reading)

{

    if (n > 0) /* Number of bytes written */

        return n;

    if (n == 0) {

        if (reading) {

            return IOS_EOF; /* EOF is -1 in javaland */

        } else {

            return 0;

        }

    }

    JNU_ThrowIOExceptionWithLastError(env, "Read/write failed");

    return IOS_THROWN;

}

JNIEXPORT jint JNICALL

Java_sun_nio_ch_IOUtil_fdVal(JNIEnv *env, jclass clazz, jobject fdo)

{

    return fdval(env, fdo);

}

JNIEXPORT void JNICALL

Java_sun_nio_ch_IOUtil_setfdVal(JNIEnv *env, jclass clazz, jobject fdo, jint val)

{

    setfdval(env, fdo, val);

}

#define SET_BLOCKING 0

#define SET_NONBLOCKING 1

JNIEXPORT void JNICALL

Java_sun_nio_ch_IOUtil_configureBlocking(JNIEnv *env, jclass clazz,

                                        jobject fdo, jboolean blocking)

{

    u_long argp;

    int result = 0;

    jint fd = fdval(env, fdo);

    if (blocking == JNI_FALSE) {

        argp = SET_NONBLOCKING;

    } else {

        argp = SET_BLOCKING;

        /* Blocking fd cannot be registered with EventSelect */

        WSAEventSelect(fd, NULL, 0);

    }

    result = ioctlsocket(fd, FIONBIO, &argp);

    if (result == SOCKET_ERROR) {

        int error = WSAGetLastError();

        handleSocketError(env, (jint)error);

    }

}

/* Note: Drain uses the int fd value. It is currently not called

   on windows.

*/

JNIEXPORT jboolean JNICALL

Java_sun_nio_ch_IOUtil_drain(JNIEnv *env, jclass cl, jint fd)

{

    DWORD read = 0;

    int totalRead = 0;

    BOOL result = 0;

    HANDLE h = (HANDLE)_get_osfhandle(fd);

    char buf[128];

    if (h == INVALID_HANDLE_VALUE) {

        JNU_ThrowIOExceptionWithLastError(env, "Read failed");

        return JNI_FALSE;

    }

    for (;;) {

        result = ReadFile(h,          /* File handle to read */

                          (LPVOID)&buf,    /* address to put data */

                          128,        /* number of bytes to read */

                          &read,      /* number of bytes read */

                          NULL);      /* no overlapped struct */

        if (result == 0) {

            int error = GetLastError();

            if (error == ERROR_NO_DATA) {

                return (totalRead > 0) ? JNI_TRUE : JNI_FALSE;

            }

            JNU_ThrowIOExceptionWithLastError(env, "Drain");

            return JNI_FALSE;

        }

        if (read > 0) {

            totalRead += read;

        } else {

            break;

        }

    }

    return (totalRead > 0) ? JNI_TRUE : JNI_FALSE;

}

/* Note: This function returns the int fd value from file descriptor.

   It is mostly used for sockets which should use the int fd value.

*/

{

    return (*env)->GetIntField(env, fdo, fd_fdID);

}

{

    (*env)->SetIntField(env, fdo, fd_fdID, val);

}

jlong

handleval(JNIEnv *env, jobject fdo)

{

    return (*env)->GetLongField(env, fdo, handle_fdID);

}