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-rw-r--r--xpcom/tests/unit/test_seek_multiplex.js173
1 files changed, 173 insertions, 0 deletions
diff --git a/xpcom/tests/unit/test_seek_multiplex.js b/xpcom/tests/unit/test_seek_multiplex.js
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+++ b/xpcom/tests/unit/test_seek_multiplex.js
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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/. */
+
+var Ci = Components.interfaces;
+var Cr = Components.results;
+var CC = Components.Constructor;
+var Cc = Components.classes;
+
+// 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");
+ do_check_eq(1, 1);
+
+ var BinaryInputStream = Components.Constructor("@mozilla.org/binaryinputstream;1",
+ "nsIBinaryInputStream");
+ var BinaryOutputStream = Components.Constructor("@mozilla.org/binaryoutputstream;1",
+ "nsIBinaryOutputStream",
+ "setOutputStream");
+ 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);
+ do_check_eq(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);
+ do_check_eq(seekable.tell(), 2);
+ do_check_eq(seekable.available(), 98);
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 9);
+ do_check_eq(seekable.tell(), 9);
+ do_check_eq(seekable.available(), 91);
+ // Seek across stream boundary.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 35);
+ do_check_eq(seekable.tell(), 35);
+ do_check_eq(seekable.available(), 65);
+ readData = sis.read(5);
+ do_check_eq(readData, data.slice(5));
+ do_check_eq(seekable.available(), 60);
+ // Seek at stream boundaries.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 40);
+ do_check_eq(seekable.tell(), 40);
+ do_check_eq(seekable.available(), 60);
+ readData = sis.read(10);
+ do_check_eq(readData, data);
+ do_check_eq(seekable.tell(), 50);
+ do_check_eq(seekable.available(), 50);
+ // Rewind and read across streams.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 39);
+ do_check_eq(seekable.tell(), 39);
+ do_check_eq(seekable.available(), 61);
+ readData = sis.read(11);
+ do_check_eq(readData, data.slice(9) + data);
+ do_check_eq(seekable.tell(), 50);
+ do_check_eq(seekable.available(), 50);
+ // Rewind to the beginning.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
+ do_check_eq(seekable.tell(), 0);
+ do_check_eq(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);
+ do_check_eq(seekable.tell(), 65);
+ do_check_eq(seekable.available(), 35);
+ readData = sis.read(10);
+ do_check_eq(readData, data.slice(5) + data.slice(0, 5));
+ do_check_eq(seekable.tell(), 75);
+ do_check_eq(seekable.available(), 25);
+ // Negative seek.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -15);
+ do_check_eq(seekable.tell(), 60);
+ do_check_eq(seekable.available(), 40);
+ readData = sis.read(10);
+ do_check_eq(readData, data);
+ do_check_eq(seekable.tell(), 70);
+ do_check_eq(seekable.available(), 30);
+
+ // -- Tests for NS_SEEK_END
+ // Normal read.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, -5);
+ do_check_eq(seekable.tell(), data.length * count - 5);
+ readData = sis.read(5);
+ do_check_eq(readData, data.slice(5));
+ do_check_eq(seekable.tell(), data.length * count);
+ // Read across streams.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_END, -15);
+ do_check_eq(seekable.tell(), data.length * count - 15);
+ readData = sis.read(15);
+ do_check_eq(readData, data.slice(5) + data);
+ do_check_eq(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;
+ }
+ do_check_eq(caught, true);
+ do_check_eq(seekable.tell(), data.length * count);
+ // Backward seek from the beginning, should be clamped.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
+ do_check_eq(seekable.tell(), 0);
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -15);
+ do_check_eq(seekable.tell(), 0);
+ // Seek too far: should be clamped.
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
+ do_check_eq(seekable.tell(), 0);
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, 3 * data.length * count);
+ do_check_eq(seekable.tell(), 100);
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, data.length * count);
+ do_check_eq(seekable.tell(), 100);
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_CUR, -2 * data.length * count);
+ do_check_eq(seekable.tell(), 0);
+}
+
+function test_multiplex_bug797871() {
+
+ var data = "1234567890123456789012345678901234567890";
+
+ var MultiplexStream = CC("@mozilla.org/io/multiplex-input-stream;1",
+ "nsIMultiplexInputStream");
+ do_check_eq(1, 1);
+
+ var BinaryInputStream = Components.Constructor("@mozilla.org/binaryinputstream;1",
+ "nsIBinaryInputStream");
+ var BinaryOutputStream = Components.Constructor("@mozilla.org/binaryoutputstream;1",
+ "nsIBinaryOutputStream",
+ "setOutputStream");
+ var multiplex = new MultiplexStream();
+ 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);
+
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 8);
+ do_check_eq(seekable.tell(), 8);
+ readData = sis.read(2);
+ do_check_eq(seekable.tell(), 10);
+
+ seekable.seek(Ci.nsISeekableStream.NS_SEEK_SET, 20);
+ do_check_eq(seekable.tell(), 20);
+}
+
+function run_test() {
+ test_multiplex_streams();
+ test_multiplex_bug797871();
+}
+
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