FileInputStream.c

/*
 * Copyright (c) 1997, 2024, 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 ************/
/*******************************************************************/

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

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

JNIEXPORTvoidJNICALL
Java_java_io_FileInputStream_initIDs(JNIEnv*env, jclassfdClass) {
fis_fd= (*env)->GetFieldID(env, fdClass, "fd", "Ljava/io/FileDescriptor;");
}

/**************************************************************
 * Input stream
 */

JNIEXPORTvoidJNICALL
Java_java_io_FileInputStream_open0(JNIEnv*env, jobjectthis, jstringpath) {
fileOpen(env, this, path, fis_fd, O_RDONLY);
}

JNIEXPORTjintJNICALL
Java_java_io_FileInputStream_read0(JNIEnv*env, jobjectthis) {
returnreadSingle(env, this, fis_fd);
}

JNIEXPORTjintJNICALL
Java_java_io_FileInputStream_readBytes(JNIEnv*env, jobjectthis,
jbyteArraybytes, jintoff, jintlen) {
returnreadBytes(env, this, bytes, off, len, fis_fd);
}

JNIEXPORTjlongJNICALL
Java_java_io_FileInputStream_length0(JNIEnv*env, jobjectthis) {

FDfd;
jlonglength=jlong_zero;

fd=getFD(env, this, fis_fd);
if (fd==-1) {
JNU_ThrowIOException(env, "Stream Closed");
return-1;
 }
if ((length=IO_GetLength(fd)) ==-1) {
JNU_ThrowIOExceptionWithLastError(env, "GetLength failed");
 }
returnlength;
}

JNIEXPORTjlongJNICALL
Java_java_io_FileInputStream_position0(JNIEnv*env, jobjectthis) {
FDfd;
jlongret;

fd=getFD(env, this, fis_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");
 }
returnret;
}

JNIEXPORTjlongJNICALL
Java_java_io_FileInputStream_skip0(JNIEnv*env, jobjectthis, jlongtoSkip) {
jlongcur=jlong_zero;
jlongend=jlong_zero;
FDfd=getFD(env, this, fis_fd);
if (fd==-1) {
JNU_ThrowIOException (env, "Stream Closed");
return0;
 }
if ((cur=IO_Lseek(fd, (jlong)0, (jint)SEEK_CUR)) ==-1) {
JNU_ThrowIOExceptionWithLastError(env, "Seek error");
 } elseif ((end=IO_Lseek(fd, toSkip, (jint)SEEK_CUR)) ==-1) {
JNU_ThrowIOExceptionWithLastError(env, "Seek error");
 }
return (end-cur);
}

JNIEXPORTjintJNICALL
Java_java_io_FileInputStream_available0(JNIEnv*env, jobjectthis) {
jlongret;
FDfd=getFD(env, this, fis_fd);
if (fd==-1) {
JNU_ThrowIOException (env, "Stream Closed");
return0;
 }
if (IO_Available(fd, &ret)) {
if (ret>INT_MAX) {
ret= (jlong) INT_MAX;
 } elseif (ret<0) {
ret=0;
 }
returnjlong_to_jint(ret);
 }
JNU_ThrowIOExceptionWithLastError(env, NULL);
return0;
}

JNIEXPORTjbooleanJNICALL
Java_java_io_FileInputStream_isRegularFile0(JNIEnv*env, jobjectthis, jobjectfdo) {
FDfd=getFD(env, this, fis_fd);
returnIO_IsRegularFile(env, fd);
}