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23 
24 /* @test
25    @bug 4028605 4109069 4234207 4401122
26    @summary Make sure ZipInputStream/InflaterInputStream.available() will
27             return 0 after EOF has reached and 1 otherwise.
28    */
29 
30 
31 import java.io.*;
32 import java.util.zip.*;
33 
34 public class Available {
35 
main(String[] args)36     public static void main(String[] args) throws Exception {
37         // 4028605 4109069 4234207
38         test1();
39         // test 4401122
40         test2();
41     }
42 
test1()43     private static void test1() throws Exception {
44         File f = new File(System.getProperty("test.src", "."), "input.jar");
45 
46         // test ZipInputStream
47         try (FileInputStream fis = new FileInputStream(f);
48              ZipInputStream z = new ZipInputStream(fis))
49         {
50             z.getNextEntry();
51             tryAvail(z);
52         }
53 
54         // test InflaterInputStream
55         try (ZipFile zfile = new ZipFile(f)) {
56             tryAvail(zfile.getInputStream(zfile.getEntry("Available.java")));
57         }
58     }
59 
tryAvail(InputStream in)60     static void tryAvail(InputStream in) throws Exception {
61         byte[] buf = new byte[1024];
62         int n;
63 
64         while ((n = in.read(buf)) != -1);
65         if (in.available() != 0) {
66             throw new Exception("available should return 0 after EOF");
67         }
68     }
69 
70     // To reproduce 4401122
test2()71     private static void test2() throws Exception {
72         File f = new File(System.getProperty("test.src", "."), "input.jar");
73         try (ZipFile zf = new ZipFile(f)) {
74             InputStream in = zf.getInputStream(zf.getEntry("Available.java"));
75 
76             int initialAvailable = in.available();
77             in.read();
78             if (in.available() != initialAvailable - 1)
79                 throw new RuntimeException("Available not decremented.");
80             for(int j=0; j<initialAvailable-1; j++)
81                 in.read();
82             if (in.available() != 0)
83                 throw new RuntimeException();
84             in.close();
85             if (in.available() != 0)
86                 throw new RuntimeException();
87         }
88     }
89 
90 }
91