1 files changed, 300 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_filestreams.js b/netwerk/test/unit/test_filestreams.js
new file mode 100644
index 0000000000..b1edf3d27b
--- /dev/null
+++ b/netwerk/test/unit/test_filestreams.js
@@ -0,0 +1,300 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// We need the profile directory so the test harness will clean up our test
+// files.
+do_get_profile();
+
+const OUTPUT_STREAM_CONTRACT_ID = "@mozilla.org/network/file-output-stream;1";
+const SAFE_OUTPUT_STREAM_CONTRACT_ID =
+  "@mozilla.org/network/safe-file-output-stream;1";
+
+////////////////////////////////////////////////////////////////////////////////
+//// Helper Methods
+
+/**
+ * Generates a leafName for a file that does not exist, but does *not*
+ * create the file. Similar to createUnique except for the fact that createUnique
+ * does create the file.
+ *
+ * @param aFile
+ *        The file to modify in order for it to have a unique leafname.
+ */
+function ensure_unique(aFile) {
+  ensure_unique.fileIndex = ensure_unique.fileIndex || 0;
+
+  var leafName = aFile.leafName;
+  while (aFile.clone().exists()) {
+    aFile.leafName = leafName + "_" + ensure_unique.fileIndex++;
+  }
+}
+
+/**
+ * Tests for files being accessed at the right time. Streams that use
+ * DEFER_OPEN should only open or create the file when an operation is
+ * done, and not during Init().
+ *
+ * Note that for writing, we check for actual writing in test_NetUtil (async)
+ * and in sync_operations in this file (sync), whereas in this function we
+ * just check that the file is *not* created during init.
+ *
+ * @param aContractId
+ *        The contract ID to use for the output stream
+ * @param aDeferOpen
+ *        Whether to check with DEFER_OPEN or not
+ * @param aTrickDeferredOpen
+ *        Whether we try to 'trick' deferred opens by changing the file object before
+ *        the actual open. The stream should have a clone, so changes to the file
+ *        object after Init and before Open should not affect it.
+ */
+function check_access(aContractId, aDeferOpen, aTrickDeferredOpen) {
+  const LEAF_NAME = "filestreams-test-file.tmp";
+  const TRICKY_LEAF_NAME = "BetYouDidNotExpectThat.tmp";
+  let file = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  file.append(LEAF_NAME);
+
+  // Writing
+
+  ensure_unique(file);
+  let ostream = Cc[aContractId].createInstance(Ci.nsIFileOutputStream);
+  ostream.init(
+    file,
+    -1,
+    -1,
+    aDeferOpen ? Ci.nsIFileOutputStream.DEFER_OPEN : 0
+  );
+  Assert.equal(aDeferOpen, !file.clone().exists()); // If defer, should not exist and vice versa
+  if (aDeferOpen) {
+    // File should appear when we do write to it.
+    if (aTrickDeferredOpen) {
+      // See |@param aDeferOpen| in the JavaDoc comment for this function
+      file.leafName = TRICKY_LEAF_NAME;
+    }
+    ostream.write("data", 4);
+    if (aTrickDeferredOpen) {
+      file.leafName = LEAF_NAME;
+    }
+    // We did a write, so the file should now exist
+    Assert.ok(file.clone().exists());
+  }
+  ostream.close();
+
+  // Reading
+
+  ensure_unique(file);
+  let istream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+    Ci.nsIFileInputStream
+  );
+  var initOk, getOk;
+  try {
+    istream.init(
+      file,
+      -1,
+      0,
+      aDeferOpen ? Ci.nsIFileInputStream.DEFER_OPEN : 0
+    );
+    initOk = true;
+  } catch (e) {
+    initOk = false;
+  }
+  try {
+    let fstream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+      Ci.nsIFileInputStream
+    );
+    fstream.init(file, -1, 0, 0);
+    getOk = true;
+  } catch (e) {
+    getOk = false;
+  }
+
+  // If the open is deferred, then Init should succeed even though the file we
+  // intend to read does not exist, and then trying to read from it should
+  // fail. The other case is where the open is not deferred, and there we should
+  // get an error when we Init (and also when we try to read).
+  Assert.ok(
+    (aDeferOpen && initOk && !getOk) || (!aDeferOpen && !initOk && !getOk)
+  );
+  istream.close();
+}
+
+/**
+ * We test async operations in test_NetUtil.js, and here test for simple sync
+ * operations on input streams.
+ *
+ * @param aDeferOpen
+ *        Whether to use DEFER_OPEN in the streams.
+ */
+function sync_operations(aDeferOpen) {
+  const TEST_DATA = "this is a test string";
+  const LEAF_NAME = "filestreams-test-file.tmp";
+
+  let file = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  file.append(LEAF_NAME);
+  file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o666);
+
+  let ostream = Cc[OUTPUT_STREAM_CONTRACT_ID].createInstance(
+    Ci.nsIFileOutputStream
+  );
+  ostream.init(
+    file,
+    -1,
+    -1,
+    aDeferOpen ? Ci.nsIFileOutputStream.DEFER_OPEN : 0
+  );
+
+  ostream.write(TEST_DATA, TEST_DATA.length);
+  ostream.close();
+
+  let fstream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+    Ci.nsIFileInputStream
+  );
+  fstream.init(file, -1, 0, aDeferOpen ? Ci.nsIFileInputStream.DEFER_OPEN : 0);
+
+  let cstream = Cc["@mozilla.org/intl/converter-input-stream;1"].createInstance(
+    Ci.nsIConverterInputStream
+  );
+  cstream.init(fstream, "UTF-8", 0, 0);
+
+  let string = {};
+  cstream.readString(-1, string);
+  cstream.close();
+  fstream.close();
+
+  Assert.equal(string.value, TEST_DATA);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// Tests
+
+function test_access() {
+  check_access(OUTPUT_STREAM_CONTRACT_ID, false, false);
+}
+
+function test_access_trick() {
+  check_access(OUTPUT_STREAM_CONTRACT_ID, false, true);
+}
+
+function test_access_defer() {
+  check_access(OUTPUT_STREAM_CONTRACT_ID, true, false);
+}
+
+function test_access_defer_trick() {
+  check_access(OUTPUT_STREAM_CONTRACT_ID, true, true);
+}
+
+function test_access_safe() {
+  check_access(SAFE_OUTPUT_STREAM_CONTRACT_ID, false, false);
+}
+
+function test_access_safe_trick() {
+  check_access(SAFE_OUTPUT_STREAM_CONTRACT_ID, false, true);
+}
+
+function test_access_safe_defer() {
+  check_access(SAFE_OUTPUT_STREAM_CONTRACT_ID, true, false);
+}
+
+function test_access_safe_defer_trick() {
+  check_access(SAFE_OUTPUT_STREAM_CONTRACT_ID, true, true);
+}
+
+function test_sync_operations() {
+  sync_operations();
+}
+
+function test_sync_operations_deferred() {
+  sync_operations(true);
+}
+
+function do_test_zero_size_buffered(disableBuffering) {
+  const LEAF_NAME = "filestreams-test-file.tmp";
+  const BUFFERSIZE = 4096;
+
+  let file = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  file.append(LEAF_NAME);
+  file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o666);
+
+  let fstream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+    Ci.nsIFileInputStream
+  );
+  fstream.init(
+    file,
+    -1,
+    0,
+    Ci.nsIFileInputStream.CLOSE_ON_EOF | Ci.nsIFileInputStream.REOPEN_ON_REWIND
+  );
+
+  var buffered = Cc[
+    "@mozilla.org/network/buffered-input-stream;1"
+  ].createInstance(Ci.nsIBufferedInputStream);
+  buffered.init(fstream, BUFFERSIZE);
+
+  if (disableBuffering) {
+    buffered.QueryInterface(Ci.nsIStreamBufferAccess).disableBuffering();
+  }
+
+  // Scriptable input streams clamp read sizes to the return value of
+  // available(), so don't quite do what we want here.
+  let cstream = Cc["@mozilla.org/intl/converter-input-stream;1"].createInstance(
+    Ci.nsIConverterInputStream
+  );
+  cstream.init(buffered, "UTF-8", 0, 0);
+
+  Assert.equal(buffered.available(), 0);
+
+  // Now try reading from this stream
+  let string = {};
+  Assert.equal(cstream.readString(BUFFERSIZE, string), 0);
+  Assert.equal(string.value, "");
+
+  // Now check that available() throws
+  var exceptionThrown = false;
+  try {
+    Assert.equal(buffered.available(), 0);
+  } catch (e) {
+    exceptionThrown = true;
+  }
+  Assert.ok(exceptionThrown);
+
+  // OK, now seek back to start
+  buffered.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0);
+
+  // Now check that available() does not throw
+  exceptionThrown = false;
+  try {
+    Assert.equal(buffered.available(), 0);
+  } catch (e) {
+    exceptionThrown = true;
+  }
+  Assert.ok(!exceptionThrown);
+}
+
+function test_zero_size_buffered() {
+  do_test_zero_size_buffered(false);
+  do_test_zero_size_buffered(true);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// Test Runner
+
+var tests = [
+  test_access,
+  test_access_trick,
+  test_access_defer,
+  test_access_defer_trick,
+  test_access_safe,
+  test_access_safe_trick,
+  test_access_safe_defer,
+  test_access_safe_defer_trick,
+  test_sync_operations,
+  test_sync_operations_deferred,
+  test_zero_size_buffered,
+];
+
+function run_test() {
+  tests.forEach(function (test) {
+    test();
+  });
+}