/*

 * Copyright (c) 1997, 2015, 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 "jni.h"

#include "jni_util.h"

#include "jlong.h"

#include "jvm.h"

#include "io_util.h"

#include "io_util_md.h"

#include "java_io_RandomAccessFile.h"

#include <fcntl.h>

/*

 * static method to store field ID's in initializers

 */

jfieldID raf_fd; /* id for jobject 'fd' in java.io.RandomAccessFile */

JNIEXPORT void JNICALL

Java_java_io_RandomAccessFile_initIDs(JNIEnv *env, jclass fdClass) {

    raf_fd = (*env)->GetFieldID(env, fdClass, "fd", "Ljava/io/FileDescriptor;");

}

JNIEXPORT void JNICALL

Java_java_io_RandomAccessFile_open0(JNIEnv *env,

                                    jobject this, jstring path, jint mode)

{

    int flags = 0;

    if (mode & java_io_RandomAccessFile_O_RDONLY)

        flags = O_RDONLY;

    else if (mode & java_io_RandomAccessFile_O_RDWR) {

        flags = O_RDWR | O_CREAT;

        if (mode & java_io_RandomAccessFile_O_SYNC)

            flags |= O_SYNC;

        else if (mode & java_io_RandomAccessFile_O_DSYNC)

            flags |= O_DSYNC;

    }

#ifdef WIN32

    if (mode & java_io_RandomAccessFile_O_TEMPORARY)

        flags |= O_TEMPORARY;

#endif

    fileOpen(env, this, path, raf_fd, flags);

}

JNIEXPORT jint JNICALL

Java_java_io_RandomAccessFile_read0(JNIEnv *env, jobject this) {

    return readSingle(env, this, raf_fd);

}

JNIEXPORT jint JNICALL

Java_java_io_RandomAccessFile_readBytes(JNIEnv *env,

    jobject this, jbyteArray bytes, jint off, jint len) {

    return readBytes(env, this, bytes, off, len, raf_fd);

}

JNIEXPORT void JNICALL

Java_java_io_RandomAccessFile_write0(JNIEnv *env, jobject this, jint byte) {

    writeSingle(env, this, byte, JNI_FALSE, raf_fd);

}

JNIEXPORT void JNICALL

Java_java_io_RandomAccessFile_writeBytes(JNIEnv *env,

    jobject this, jbyteArray bytes, jint off, jint len) {

    writeBytes(env, this, bytes, off, len, JNI_FALSE, raf_fd);

}

JNIEXPORT jlong JNICALL

Java_java_io_RandomAccessFile_getFilePointer(JNIEnv *env, jobject this) {

    FD fd;

    jlong ret;

    fd = GET_FD(this, raf_fd);

    if (fd == -1) {

        JNU_ThrowIOException(env, "Stream Closed");

        return -1;

    }

    if ((ret = IO_Lseek(fd, 0L, SEEK_CUR)) == -1) {

        JNU_ThrowIOExceptionWithLastError(env, "Seek failed");

    }

    return ret;

}

JNIEXPORT jlong JNICALL

Java_java_io_RandomAccessFile_length(JNIEnv *env, jobject this) {

    FD fd;

    jlong length = jlong_zero;

    fd = GET_FD(this, raf_fd);

    if (fd == -1) {

        JNU_ThrowIOException(env, "Stream Closed");

        return -1;

    }

    if ((length = IO_GetLength(fd)) == -1) {

        JNU_ThrowIOExceptionWithLastError(env, "GetLength failed");

    }

    return length;

}

JNIEXPORT void JNICALL

Java_java_io_RandomAccessFile_seek0(JNIEnv *env,

                    jobject this, jlong pos) {

    FD fd;

    fd = GET_FD(this, raf_fd);

    if (fd == -1) {

        JNU_ThrowIOException(env, "Stream Closed");

        return;

    }

    if (pos < jlong_zero) {

        JNU_ThrowIOException(env, "Negative seek offset");

    } else if (IO_Lseek(fd, pos, SEEK_SET) == -1) {

        JNU_ThrowIOExceptionWithLastError(env, "Seek failed");

    }

}

JNIEXPORT void JNICALL

Java_java_io_RandomAccessFile_setLength(JNIEnv *env, jobject this,

                                        jlong newLength)

{

    FD fd;

    jlong cur;

    fd = GET_FD(this, raf_fd);

    if (fd == -1) {

        JNU_ThrowIOException(env, "Stream Closed");

        return;

    }

    if ((cur = IO_Lseek(fd, 0L, SEEK_CUR)) == -1) goto fail;

    if (IO_SetLength(fd, newLength) == -1) goto fail;

    if (cur > newLength) {

        if (IO_Lseek(fd, 0L, SEEK_END) == -1) goto fail;

    } else {

        if (IO_Lseek(fd, cur, SEEK_SET) == -1) goto fail;

    }

    return;

 fail:

    JNU_ThrowIOExceptionWithLastError(env, "setLength failed");

}