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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// The string we use as data.
const data = "0123456789";
// Number of streams in the multiplex stream.
const count = 10;
function test_multiplex_streams() {
var MultiplexStream = CC(
"@mozilla.org/io/multiplex-input-stream;1",
"nsIMultiplexInputStream"
);
Assert.equal(1, 1);
var multiplex = new MultiplexStream();
for (var i = 0; i < count; ++i) {
let s = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
Ci.nsIStringInputStream
);
s.setData(data, data.length);
multiplex.appendStream(s);
}
var seekable = multiplex.QueryInterface(Ci.nsISeekableStream);
var sis = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(
Ci.nsIScriptableInputStream
);
sis.init(seekable);
// Read some data.
var readData = sis.read(20);
Assert.equal(readData, data + data);
// -- Tests for NS_SEEK_SET
// Seek to a non-zero, non-stream-boundary offset.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 2);
Assert.equal(seekable.tell(), 2);
Assert.equal(seekable.available(), 98);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 9);
Assert.equal(seekable.tell(), 9);
Assert.equal(seekable.available(), 91);
// Seek across stream boundary.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 35);
Assert.equal(seekable.tell(), 35);
Assert.equal(seekable.available(), 65);
readData = sis.read(5);
Assert.equal(readData, data.slice(5));
Assert.equal(seekable.available(), 60);
// Seek at stream boundaries.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 40);
Assert.equal(seekable.tell(), 40);
Assert.equal(seekable.available(), 60);
readData = sis.read(10);
Assert.equal(readData, data);
Assert.equal(seekable.tell(), 50);
Assert.equal(seekable.available(), 50);
// Rewind and read across streams.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 39);
Assert.equal(seekable.tell(), 39);
Assert.equal(seekable.available(), 61);
readData = sis.read(11);
Assert.equal(readData, data.slice(9) + data);
Assert.equal(seekable.tell(), 50);
Assert.equal(seekable.available(), 50);
// Rewind to the beginning.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
Assert.equal(seekable.tell(), 0);
Assert.equal(seekable.available(), 100);
// Seek to some random location
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 50);
// -- Tests for NS_SEEK_CUR
// Positive seek.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, 15);
Assert.equal(seekable.tell(), 65);
Assert.equal(seekable.available(), 35);
readData = sis.read(10);
Assert.equal(readData, data.slice(5) + data.slice(0, 5));
Assert.equal(seekable.tell(), 75);
Assert.equal(seekable.available(), 25);
// Negative seek.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -15);
Assert.equal(seekable.tell(), 60);
Assert.equal(seekable.available(), 40);
readData = sis.read(10);
Assert.equal(readData, data);
Assert.equal(seekable.tell(), 70);
Assert.equal(seekable.available(), 30);
// -- Tests for NS_SEEK_END
// Normal read.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, -5);
Assert.equal(seekable.tell(), data.length * count - 5);
readData = sis.read(5);
Assert.equal(readData, data.slice(5));
Assert.equal(seekable.tell(), data.length * count);
// Read across streams.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, -15);
Assert.equal(seekable.tell(), data.length * count - 15);
readData = sis.read(15);
Assert.equal(readData, data.slice(5) + data);
Assert.equal(seekable.tell(), data.length * count);
// -- Try to do various edge cases
// Forward seek from the end, should throw.
var caught = false;
try {
seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, 15);
} catch (e) {
caught = true;
}
Assert.equal(caught, true);
Assert.equal(seekable.tell(), data.length * count);
// Backward seek from the beginning, should be clamped.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
Assert.equal(seekable.tell(), 0);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -15);
Assert.equal(seekable.tell(), 0);
// Seek too far: should be clamped.
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
Assert.equal(seekable.tell(), 0);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, 3 * data.length * count);
Assert.equal(seekable.tell(), 100);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, data.length * count);
Assert.equal(seekable.tell(), 100);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -2 * data.length * count);
Assert.equal(seekable.tell(), 0);
}
function test_multiplex_bug797871() {
var data2 = "1234567890123456789012345678901234567890";
var MultiplexStream = CC(
"@mozilla.org/io/multiplex-input-stream;1",
"nsIMultiplexInputStream"
);
Assert.equal(1, 1);
var multiplex = new MultiplexStream();
let s = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
Ci.nsIStringInputStream
);
s.setData(data2, data2.length);
multiplex.appendStream(s);
var seekable = multiplex.QueryInterface(Ci.nsISeekableStream);
var sis = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(
Ci.nsIScriptableInputStream
);
sis.init(seekable);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 8);
Assert.equal(seekable.tell(), 8);
sis.read(2);
Assert.equal(seekable.tell(), 10);
seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 20);
Assert.equal(seekable.tell(), 20);
}
function run_test() {
test_multiplex_streams();
test_multiplex_bug797871();
}
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