1 /*

        2  * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.

        3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

        4  *

        5  * This code is free software; you can redistribute it and/or modify it

        6  * under the terms of the GNU General Public License version 2 only, as

        7  * published by the Free Software Foundation.  Oracle designates this

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

        9  * by Oracle in the LICENSE file that accompanied this code.

       10  *

       11  * This code is distributed in the hope that it will be useful, but WITHOUT

       12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

       13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

       14  * version 2 for more details (a copy is included in the LICENSE file that

       15  * accompanied this code).

       16  *

       17  * You should have received a copy of the GNU General Public License version

       18  * 2 along with this work; if not, write to the Free Software Foundation,

       19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

       20  *

       21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

       22  * or visit www.oracle.com if you need additional information or have any

       23  * questions.

       24  */

       25 

       26 #include "jni.h"

       27 #include "jni_util.h"

       28 #include "jlong.h"

       29 #include "io_util.h"

       30 

       31 #include "jvm.h"

       32 

       33 #include "java_io_FileInputStream.h"

       34 

       35 #include <fcntl.h>

       36 #include <limits.h>

       37 

       38 #include "io_util_md.h"

       39 

       40 /*******************************************************************/

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

       42 /*******************************************************************/

       43 

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

       45 

       46 /**************************************************************

       47  * static methods to store field ID's in initializers

       48  */

       49 

       50 JNIEXPORT void JNICALL

       51 Java_java_io_FileInputStream_initIDs(JNIEnv *env, jclass fdClass) {

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

       53 }

       54 

       55 /**************************************************************

       56  * Input stream

       57  */

       58 

       59 JNIEXPORT void JNICALL

       60 Java_java_io_FileInputStream_open(JNIEnv *env, jobject this, jstring path) {

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

       62 }

       63 

       64 JNIEXPORT jint JNICALL

       65 Java_java_io_FileInputStream_read(JNIEnv *env, jobject this) {

       66     return readSingle(env, this, fis_fd);

       67 }

       68 

       69 JNIEXPORT jint JNICALL

       70 Java_java_io_FileInputStream_readBytes(JNIEnv *env, jobject this,

       71         jbyteArray bytes, jint off, jint len) {

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

       73 }

       74 

       75 JNIEXPORT jlong JNICALL

       76 Java_java_io_FileInputStream_skip(JNIEnv *env, jobject this, jlong toSkip) {

       77     jlong cur = jlong_zero;

       78     jlong end = jlong_zero;

       79     FD fd = GET_FD(this, fis_fd);

       80     if (fd == -1) {

       81         JNU_ThrowIOException (env, "Stream Closed");

       82         return 0;

       83     }

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

       85         JNU_ThrowIOExceptionWithLastError(env, "Seek error");

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

       87         JNU_ThrowIOExceptionWithLastError(env, "Seek error");

       88     }

       89     return (end - cur);

       90 }

       91 

       92 JNIEXPORT jint JNICALL

       93 Java_java_io_FileInputStream_available(JNIEnv *env, jobject this) {

       94     jlong ret;

       95     FD fd = GET_FD(this, fis_fd);

       96     if (fd == -1) {

       97         JNU_ThrowIOException (env, "Stream Closed");

       98         return 0;

       99     }

      100     if (IO_Available(fd, &ret)) {

      101         if (ret > INT_MAX) {

      102             ret = (jlong) INT_MAX;

      103         }

      104         return jlong_to_jint(ret);

      105     }

      106     JNU_ThrowIOExceptionWithLastError(env, NULL);

      107     return 0;

      108 }