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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*
* Copyright (c) 1997, 2010, 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.
*
* 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.
*/
/* @test
@bug 4027717
@summary Check for correct implementation of RandomAccessFile.skipBytes
*/
import java.io.*;
public class SkipBytes{
/*
* doTest attempts to skip num_to_skip bytes in raf starting from position 0.
* It also does a read after the skip to check if EOF has been reached
* correctly or incorrectly.
*/
private static void doTest(RandomAccessFile raf, int start, int num_to_skip)
throws Exception
{
raf.seek(start);
long cur_ptr = raf.getFilePointer();
int length = (int) raf.length();
System.err.println("\nCurrent pointer = " + cur_ptr + " length = " +
length + " num_to_skip = " + num_to_skip);
//Do the Skip test
int num_skipped = raf.skipBytes(num_to_skip);
System.err.println("After skipBytes -- no. skipped = " + num_skipped);
// if num_to_skip is negative do the negative skip test
if (num_to_skip <= 0) {
if (num_skipped != 0){
System.err.println("Negative Skip Test Failed");
throw new RuntimeException("Negative Skip Test Failed");
}
else {
System.err.println("Negative Skip Test Succeeded");
}
}
cur_ptr = raf.getFilePointer();
System.err.println("Current pointer = " + cur_ptr);
// Check if skip has gone beyond EOF.
if (cur_ptr > length) {
System.err.println("Past EOF Skip Test Failed");
throw new RuntimeException("Past EOF Skip Test Failed");
}
else {
System.err.println("Past EOF Skip Test Succeeded");
}
// do read test
int byte_read = raf.read();
if ( (cur_ptr == length) &&
(byte_read != -1) ) {
System.err.println("byte_read = " + byte_read +
" Read Test Failed ......");
throw new RuntimeException("Read Test Failed");
}
else {
System.err.println("byte_read = " + byte_read +
" Read Test Succeeded");
}
}
public static void main(String[] args) throws Exception {
RandomAccessFile raf = new RandomAccessFile("input.txt" , "rw");
try {
int length = (int)raf.length();
doTest(raf , 0 , 2*length);
doTest(raf , 0 , length);
doTest(raf , 0 , length/2);
doTest(raf , length/2 , -2);
doTest(raf , length , 0);
doTest(raf , 0 , -1);
} finally{
raf.close();
}
}
}
|
