1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 // The string we use as data.
6 const data = "0123456789";
7 // Number of streams in the multiplex stream.
10 function test_multiplex_streams() {
11 var MultiplexStream = CC(
12 "@mozilla.org/io/multiplex-input-stream;1",
13 "nsIMultiplexInputStream"
17 var multiplex = new MultiplexStream();
18 for (var i = 0; i < count; ++i) {
19 let s = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
20 Ci.nsIStringInputStream
22 s.setData(data, data.length);
24 multiplex.appendStream(s);
26 var seekable = multiplex.QueryInterface(Ci.nsISeekableStream);
27 var sis = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(
28 Ci.nsIScriptableInputStream
32 var readData = sis.read(20);
33 Assert.equal(readData, data + data);
34 // -- Tests for NS_SEEK_SET
35 // Seek to a non-zero, non-stream-boundary offset.
36 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 2);
37 Assert.equal(seekable.tell(), 2);
38 Assert.equal(seekable.available(), 98);
39 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 9);
40 Assert.equal(seekable.tell(), 9);
41 Assert.equal(seekable.available(), 91);
42 // Seek across stream boundary.
43 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 35);
44 Assert.equal(seekable.tell(), 35);
45 Assert.equal(seekable.available(), 65);
46 readData = sis.read(5);
47 Assert.equal(readData, data.slice(5));
48 Assert.equal(seekable.available(), 60);
49 // Seek at stream boundaries.
50 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 40);
51 Assert.equal(seekable.tell(), 40);
52 Assert.equal(seekable.available(), 60);
53 readData = sis.read(10);
54 Assert.equal(readData, data);
55 Assert.equal(seekable.tell(), 50);
56 Assert.equal(seekable.available(), 50);
57 // Rewind and read across streams.
58 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 39);
59 Assert.equal(seekable.tell(), 39);
60 Assert.equal(seekable.available(), 61);
61 readData = sis.read(11);
62 Assert.equal(readData, data.slice(9) + data);
63 Assert.equal(seekable.tell(), 50);
64 Assert.equal(seekable.available(), 50);
65 // Rewind to the beginning.
66 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
67 Assert.equal(seekable.tell(), 0);
68 Assert.equal(seekable.available(), 100);
69 // Seek to some random location
70 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 50);
71 // -- Tests for NS_SEEK_CUR
73 seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, 15);
74 Assert.equal(seekable.tell(), 65);
75 Assert.equal(seekable.available(), 35);
76 readData = sis.read(10);
77 Assert.equal(readData, data.slice(5) + data.slice(0, 5));
78 Assert.equal(seekable.tell(), 75);
79 Assert.equal(seekable.available(), 25);
81 seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -15);
82 Assert.equal(seekable.tell(), 60);
83 Assert.equal(seekable.available(), 40);
84 readData = sis.read(10);
85 Assert.equal(readData, data);
86 Assert.equal(seekable.tell(), 70);
87 Assert.equal(seekable.available(), 30);
89 // -- Tests for NS_SEEK_END
91 seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, -5);
92 Assert.equal(seekable.tell(), data.length * count - 5);
93 readData = sis.read(5);
94 Assert.equal(readData, data.slice(5));
95 Assert.equal(seekable.tell(), data.length * count);
96 // Read across streams.
97 seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, -15);
98 Assert.equal(seekable.tell(), data.length * count - 15);
99 readData = sis.read(15);
100 Assert.equal(readData, data.slice(5) + data);
101 Assert.equal(seekable.tell(), data.length * count);
103 // -- Try to do various edge cases
104 // Forward seek from the end, should throw.
107 seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, 15);
111 Assert.equal(caught, true);
112 Assert.equal(seekable.tell(), data.length * count);
113 // Backward seek from the beginning, should be clamped.
114 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
115 Assert.equal(seekable.tell(), 0);
116 seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -15);
117 Assert.equal(seekable.tell(), 0);
118 // Seek too far: should be clamped.
119 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
120 Assert.equal(seekable.tell(), 0);
121 seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, 3 * data.length * count);
122 Assert.equal(seekable.tell(), 100);
123 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, data.length * count);
124 Assert.equal(seekable.tell(), 100);
125 seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -2 * data.length * count);
126 Assert.equal(seekable.tell(), 0);
129 function test_multiplex_bug797871() {
130 var data2 = "1234567890123456789012345678901234567890";
132 var MultiplexStream = CC(
133 "@mozilla.org/io/multiplex-input-stream;1",
134 "nsIMultiplexInputStream"
138 var multiplex = new MultiplexStream();
139 let s = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
140 Ci.nsIStringInputStream
142 s.setData(data2, data2.length);
144 multiplex.appendStream(s);
146 var seekable = multiplex.QueryInterface(Ci.nsISeekableStream);
147 var sis = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(
148 Ci.nsIScriptableInputStream
152 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 8);
153 Assert.equal(seekable.tell(), 8);
155 Assert.equal(seekable.tell(), 10);
157 seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 20);
158 Assert.equal(seekable.tell(), 20);
161 function run_test() {
162 test_multiplex_streams();
163 test_multiplex_bug797871();