/*

 * 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 <fcntl.h>

#include <limits.h>

#include "jni.h"

#include "jni_util.h"

#include "jlong.h"

#include "io_util.h"

#include "jvm.h"

#include "java_io_FileInputStream.h"

#include "io_util_md.h"

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

/*  BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/

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

jfieldID fis_fd; /* id for jobject 'fd' in java.io.FileInputStream */

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

 * static methods to store field ID's in initializers

 */

JNIEXPORT void JNICALL

Java_java_io_FileInputStream_initIDs(JNIEnv *env, jclass fdClass) {

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

}

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

 * Input stream

 */

JNIEXPORT void JNICALL

Java_java_io_FileInputStream_open0(JNIEnv *env, jobject this, jstring path) {

    fileOpen(env, this, path, fis_fd, O_RDONLY);

}

JNIEXPORT jint JNICALL

Java_java_io_FileInputStream_read0(JNIEnv *env, jobject this) {

    return readSingle(env, this, fis_fd);

}

JNIEXPORT jint JNICALL

Java_java_io_FileInputStream_readBytes(JNIEnv *env, jobject this,

        jbyteArray bytes, jint off, jint len) {

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

}

JNIEXPORT jlong JNICALL

Java_java_io_FileInputStream_skip0(JNIEnv *env, jobject this, jlong toSkip) {

    jlong cur = jlong_zero;

    jlong end = jlong_zero;

    FD fd = GET_FD(this, fis_fd);

    if (fd == -1) {

        JNU_ThrowIOException (env, "Stream Closed");

        return 0;

    }

    if ((cur = IO_Lseek(fd, (jlong)0, (jint)SEEK_CUR)) == -1) {

        JNU_ThrowIOExceptionWithLastError(env, "Seek error");

    } else if ((end = IO_Lseek(fd, toSkip, (jint)SEEK_CUR)) == -1) {

        JNU_ThrowIOExceptionWithLastError(env, "Seek error");

    }

    return (end - cur);

}

JNIEXPORT jint JNICALL

Java_java_io_FileInputStream_available0(JNIEnv *env, jobject this) {

    jlong ret;

    FD fd = GET_FD(this, fis_fd);

    if (fd == -1) {

        JNU_ThrowIOException (env, "Stream Closed");

        return 0;

    }

    if (IO_Available(fd, &ret)) {

        if (ret > INT_MAX) {

            ret = (jlong) INT_MAX;

        } else if (ret < 0) {

            ret = 0;

        }

        return jlong_to_jint(ret);

    }

    JNU_ThrowIOExceptionWithLastError(env, NULL);

    return 0;

}