1 files changed, 106 insertions, 0 deletions
diff --git a/toolkit/components/osfile/tests/xpcshell/test_compression.js b/toolkit/components/osfile/tests/xpcshell/test_compression.js
new file mode 100644
index 0000000000..2daa4c7891
--- /dev/null
+++ b/toolkit/components/osfile/tests/xpcshell/test_compression.js
@@ -0,0 +1,106 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const { OS } = ChromeUtils.import("resource://gre/modules/osfile.jsm");
+
+function run_test() {
+  do_test_pending();
+  run_next_test();
+}
+
+add_task(async function test_compress_lz4() {
+  let path = OS.Path.join(OS.Constants.Path.tmpDir, "compression.lz");
+  let length = 1024;
+  let array = new Uint8Array(length);
+  for (let i = 0; i < array.byteLength; ++i) {
+    array[i] = i;
+  }
+  let arrayAsString = Array.prototype.join.call(array);
+
+  info("Writing data with lz4 compression");
+  let bytes = await OS.File.writeAtomic(path, array, { compression: "lz4" });
+  info("Compressed " + length + " bytes into " + bytes);
+
+  info("Reading back with lz4 decompression");
+  let decompressed = await OS.File.read(path, { compression: "lz4" });
+  info("Decompressed into " + decompressed.byteLength + " bytes");
+  Assert.equal(arrayAsString, Array.prototype.join.call(decompressed));
+});
+
+add_task(async function test_uncompressed() {
+  info("Writing data without compression");
+  let path = OS.Path.join(OS.Constants.Path.tmpDir, "no_compression.tmp");
+  let array = new Uint8Array(1024);
+  for (let i = 0; i < array.byteLength; ++i) {
+    array[i] = i;
+  }
+  await OS.File.writeAtomic(path, array); // No compression
+
+  let exn;
+  // Force decompression, reading should fail
+  try {
+    await OS.File.read(path, { compression: "lz4" });
+  } catch (ex) {
+    exn = ex;
+  }
+  Assert.ok(!!exn);
+  // Check the exception message (and that it contains the file name)
+  Assert.ok(
+    exn.message.includes(`Invalid header (no magic number) - Data: ${path}`)
+  );
+});
+
+add_task(async function test_no_header() {
+  let path = OS.Path.join(OS.Constants.Path.tmpDir, "no_header.tmp");
+  let array = new Uint8Array(8).fill(0, 0); // Small array with no header
+
+  info("Writing data with no header");
+
+  await OS.File.writeAtomic(path, array); // No compression
+  let exn;
+  // Force decompression, reading should fail
+  try {
+    await OS.File.read(path, { compression: "lz4" });
+  } catch (ex) {
+    exn = ex;
+  }
+  Assert.ok(!!exn);
+  // Check the exception message (and that it contains the file name)
+  Assert.ok(
+    exn.message.includes(`Buffer is too short (no header) - Data: ${path}`)
+  );
+});
+
+add_task(async function test_invalid_content() {
+  let path = OS.Path.join(OS.Constants.Path.tmpDir, "invalid_content.tmp");
+  let arr1 = new Uint8Array([109, 111, 122, 76, 122, 52, 48, 0]);
+  let arr2 = new Uint8Array(248).fill(1, 0);
+
+  let array = new Uint8Array(arr1.length + arr2.length);
+  array.set(arr1);
+  array.set(arr2, arr1.length);
+
+  info("Writing invalid data (with a valid header and only ones after that)");
+
+  await OS.File.writeAtomic(path, array); // No compression
+  let exn;
+  // Force decompression, reading should fail
+  try {
+    await OS.File.read(path, { compression: "lz4" });
+  } catch (ex) {
+    exn = ex;
+  }
+  Assert.ok(!!exn);
+  // Check the exception message (and that it contains the file name)
+  Assert.ok(
+    exn.message.includes(
+      `Invalid content: Decompression stopped at 0 - Data: ${path}`
+    )
+  );
+});
+
+add_task(function() {
+  do_test_finished();
+});