1/*
2 * Copyright (c) 1997, 2015, 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 <fcntl.h>
27#include <limits.h>
28
29#include "jni.h"
30#include "jni_util.h"
31#include "jlong.h"
32#include "io_util.h"
33
34#include "jvm.h"
35
36#include "java_io_FileInputStream.h"
37
38#include "io_util_md.h"
39
40/*******************************************************************/
41/* BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/
42/*******************************************************************/
43
44jfieldID fis_fd; /* id for jobject 'fd' in java.io.FileInputStream */
45
46/**************************************************************
47 * static methods to store field ID's in initializers
48 */
49
50JNIEXPORT void JNICALL
51Java_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
59JNIEXPORT void JNICALL
60Java_java_io_FileInputStream_open0(JNIEnv *env, jobject this, jstring path) {
61 fileOpen(env, this, path, fis_fd, O_RDONLY);
62}
63
64JNIEXPORT jint JNICALL
65Java_java_io_FileInputStream_read0(JNIEnv *env, jobject this) {
66 return readSingle(env, this, fis_fd);
67}
68
69JNIEXPORT jint JNICALL
70Java_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
75JNIEXPORT jlong JNICALL
76Java_java_io_FileInputStream_skip0(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
92JNIEXPORT jint JNICALL
93Java_java_io_FileInputStream_available0(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 } else if (ret < 0) {
104 ret = 0;
105 }
106 return jlong_to_jint(ret);
107 }
108 JNU_ThrowIOExceptionWithLastError(env, NULL);
109 return 0;
110}
111