1 files changed, 89 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_localstreams.js b/netwerk/test/unit/test_localstreams.js
new file mode 100644
index 0000000000..3e9c26b111
--- /dev/null
+++ b/netwerk/test/unit/test_localstreams.js
@@ -0,0 +1,89 @@
+// Tests bug 304414
+
+"use strict";
+
+const PR_RDONLY = 0x1; // see prio.h
+
+// Does some sanity checks on the stream and returns the number of bytes read
+// when the checks passed.
+function test_stream(stream) {
+  // This test only handles blocking streams; that's desired for file streams
+  // anyway.
+  Assert.equal(stream.isNonBlocking(), false);
+
+  // Check that the stream is not buffered
+  Assert.equal(
+    Cc["@mozilla.org/io-util;1"]
+      .getService(Ci.nsIIOUtil)
+      .inputStreamIsBuffered(stream),
+    false
+  );
+
+  // Wrap it in a binary stream (to avoid wrong results that
+  // scriptablestream would produce with binary content)
+  var binstream = Cc["@mozilla.org/binaryinputstream;1"].createInstance(
+    Ci.nsIBinaryInputStream
+  );
+  binstream.setInputStream(stream);
+
+  var numread = 0;
+  for (;;) {
+    Assert.equal(stream.available(), binstream.available());
+    var avail = stream.available();
+    Assert.notEqual(avail, -1);
+
+    // PR_UINT32_MAX and PR_INT32_MAX; the files we're testing with aren't that
+    // large.
+    Assert.notEqual(avail, Math.pow(2, 32) - 1);
+    Assert.notEqual(avail, Math.pow(2, 31) - 1);
+
+    if (!avail) {
+      // For blocking streams, available() only returns 0 on EOF
+      // Make sure that there is really no data left
+      var could_read = false;
+      try {
+        binstream.readByteArray(1);
+        could_read = true;
+      } catch (e) {
+        // We expect the exception, so do nothing here
+      }
+      if (could_read) {
+        do_throw("Data readable when available indicated EOF!");
+      }
+      return numread;
+    }
+
+    dump("Trying to read " + avail + " bytes\n");
+    // Note: Verification that this does return as much bytes as we asked for is
+    // done in the binarystream implementation
+    binstream.readByteArray(avail);
+
+    numread += avail;
+  }
+}
+
+function stream_for_file(file) {
+  var str = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+    Ci.nsIFileInputStream
+  );
+  str.init(file, PR_RDONLY, 0, 0);
+  return str;
+}
+
+function stream_from_channel(file) {
+  var uri = Services.io.newFileURI(file);
+  return NetUtil.newChannel({
+    uri,
+    loadUsingSystemPrincipal: true,
+  }).open();
+}
+
+function run_test() {
+  // Get a file and a directory in order to do some testing
+  var file = do_get_file("../unit/data/test_readline6.txt");
+  var len = file.fileSize;
+  Assert.equal(test_stream(stream_for_file(file)), len);
+  Assert.equal(test_stream(stream_from_channel(file)), len);
+  var dir = file.parent;
+  test_stream(stream_from_channel(dir)); // Can't do size checking
+}