/*

 * Copyright 1997-2002 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include "jvm.h"

#include "jni_util.h"

#include "net_util.h"

#include "java_net_SocketInputStream.h"

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

 * SocketInputStream

 */

static jfieldID IO_fd_fdID;

/*

 * Class:     java_net_SocketInputStream

 * Method:    init

 * Signature: ()V

 */

JNIEXPORT void JNICALL

Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) {

    IO_fd_fdID = NET_GetFileDescriptorID(env);

}

/*

 * Class:     java_net_SocketInputStream

 * Method:    socketRead0

 * Signature: (Ljava/io/FileDescriptor;[BIII)I

 */

JNIEXPORT jint JNICALL

Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,

                                            jobject fdObj, jbyteArray data,

                                            jint off, jint len, jint timeout)

{

    char BUF[MAX_BUFFER_LEN];

    char *bufP;

    jint fd, nread;

    jint n;

    if (IS_NULL(fdObj)) {

        /* should't this be a NullPointerException? -br */

        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

                        "Socket closed");

        return -1;

    } else {

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

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

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

         */

        if (fd == -1) {

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

            return -1;

        }

    }

    /*

     * If the read is greater than our stack allocated buffer then

     * we allocate from the heap (up to a limit)

     */

    if (len > MAX_BUFFER_LEN) {

        if (len > MAX_HEAP_BUFFER_LEN) {

            len = MAX_HEAP_BUFFER_LEN;

        }

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

        if (bufP == NULL) {

            bufP = BUF;

            len = MAX_BUFFER_LEN;

        }

    } else {

        bufP = BUF;

    }

    if (timeout) {

        nread = NET_Timeout(fd, timeout);

        if (nread <= 0) {

            if (nread == 0) {

                JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",

                            "Read timed out");

            } else if (nread == JVM_IO_ERR) {

                if (errno == EBADF) {

                     JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");

                 } else {

                     NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException",

                                                  "select/poll failed");

                 }

            } else if (nread == JVM_IO_INTR) {

                JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",

                            "Operation interrupted");

            }

            if (bufP != BUF) {

                free(bufP);

            }

            return -1;

        }

    }

    nread = NET_Read(fd, bufP, len);

    if (nread <= 0) {

        if (nread < 0) {

            switch (errno) {

                case ECONNRESET:

                case EPIPE:

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

                        "Connection reset");

                    break;

                case EBADF:

                    JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",

                        "Socket closed");

                    break;

                case EINTR:

                     JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",

                           "Operation interrupted");

                     break;

                default:

                    NET_ThrowByNameWithLastError(env,

                        JNU_JAVANETPKG "SocketException", "Read failed");

            }

        }

    } else {

        (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);

    }

    if (bufP != BUF) {

        free(bufP);

    }

    return nread;

}