1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/* Copyright (C) 1998, 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.io;
/**
* @author Warren Levy <warrenl@cygnus.com>
* @date October 28, 1998.
*/
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
* "The Java Language Specification", ISBN 0-201-63451-1
* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
* Status: Believed complete and correct.
*/
public class FileInputStream extends InputStream
{
/* Contains the file descriptor for referencing the actual file. */
private FileDescriptor fd;
public FileInputStream(String name) throws FileNotFoundException
{
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkRead(name);
fd = new FileDescriptor(name, FileDescriptor.READ);
}
public FileInputStream(File file) throws FileNotFoundException
{
this(file.getPath());
}
public FileInputStream(FileDescriptor fdObj)
{
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkRead(fdObj);
fd = fdObj;
}
public int available() throws IOException
{
return fd.available();
}
public void close() throws IOException
{
if (fd == null)
return;
fd.close();
fd = null;
}
protected void finalize() throws IOException
{
if (fd != null)
fd.finalize();
}
public final FileDescriptor getFD() throws IOException
{
if (!fd.valid())
throw new IOException();
return fd;
}
public int read() throws IOException
{
return fd.read();
}
public int read(byte[] b) throws IOException
{
return fd.read(b, 0, b.length);
}
public int read(byte[] b, int off, int len) throws IOException
{
if (off < 0 || len < 0 || off + len > b.length)
throw new ArrayIndexOutOfBoundsException();
return fd.read(b, off, len);
}
public long skip(long n) throws IOException
{
return fd.seek(n, FileDescriptor.CUR);
}
}
|
