/*

 * Copyright (c) 1997, 2016, 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 <errno.h>

#include <stdlib.h>

#include <string.h>

#include "net_util.h"

#include "java_net_SocketOutputStream.h"

#define min(a, b)       ((a) < (b) ? (a) : (b))

/*

 * SocketOutputStream

 */

static jfieldID IO_fd_fdID;

/*

 * Class:     java_net_SocketOutputStream

 * Method:    init

 * Signature: ()V

 */

JNIEXPORT void JNICALL

Java_java_net_SocketOutputStream_init(JNIEnv *env, jclass cls) {

    IO_fd_fdID = NET_GetFileDescriptorID(env);

}

/*

 * Class:     java_net_SocketOutputStream

 * Method:    socketWrite0

 * Signature: (Ljava/io/FileDescriptor;[BII)V

 */

JNIEXPORT void JNICALL

Java_java_net_SocketOutputStream_socketWrite0(JNIEnv *env, jobject this,

                                              jobject fdObj,

                                              jbyteArray data,

                                              jint off, jint len) {

    char *bufP;

    char BUF[MAX_BUFFER_LEN];

    int buflen;

    int fd;

    if (IS_NULL(fdObj)) {

        JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");

        return;

    } else {

        fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);

        /* Bug 4086704 - If the Socket associated with this file descriptor

         * was closed (sysCloseFD), the file descriptor is set to -1.

         */

        if (fd == -1) {

            JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");

            return;

        }

    }

    if (len <= MAX_BUFFER_LEN) {

        bufP = BUF;

        buflen = MAX_BUFFER_LEN;

    } else {

        buflen = min(MAX_HEAP_BUFFER_LEN, len);

        bufP = (char *)malloc((size_t)buflen);

        /* if heap exhausted resort to stack buffer */

        if (bufP == NULL) {

            bufP = BUF;

            buflen = MAX_BUFFER_LEN;

        }

    }

    while(len > 0) {

        int loff = 0;

        int chunkLen = min(buflen, len);

        int llen = chunkLen;

        (*env)->GetByteArrayRegion(env, data, off, chunkLen, (jbyte *)bufP);

        if ((*env)->ExceptionCheck(env)) {

            break;

        } else {

            while(llen > 0) {

                int n = NET_Send(fd, bufP + loff, llen, 0);

                if (n > 0) {

                    llen -= n;

                    loff += n;

                    continue;

                }

                if (errno == ECONNRESET) {

                    JNU_ThrowByName(env, "sun/net/ConnectionResetException",

                        "Connection reset");

                } else {

                    JNU_ThrowByNameWithMessageAndLastError

                        (env, "java/net/SocketException", "Write failed");

                }

                if (bufP != BUF) {

                    free(bufP);

                }

                return;

            }

            len -= chunkLen;

            off += chunkLen;

        }

    }

    if (bufP != BUF) {

        free(bufP);

    }

}