1 files changed, 165 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestSnappyStreams.cpp b/xpcom/tests/gtest/TestSnappyStreams.cpp
new file mode 100644
index 0000000000..e4559bc987
--- /dev/null
+++ b/xpcom/tests/gtest/TestSnappyStreams.cpp
@@ -0,0 +1,165 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include <algorithm>
+#include "gtest/gtest.h"
+#include "Helpers.h"
+#include "mozilla/SnappyCompressOutputStream.h"
+#include "mozilla/SnappyUncompressInputStream.h"
+#include "nsIPipe.h"
+#include "nsStreamUtils.h"
+#include "nsString.h"
+#include "nsStringStream.h"
+#include "nsTArray.h"
+
+namespace {
+
+using mozilla::SnappyCompressOutputStream;
+using mozilla::SnappyUncompressInputStream;
+
+static already_AddRefed<nsIOutputStream> CompressPipe(
+    nsIInputStream** aReaderOut) {
+  nsCOMPtr<nsIOutputStream> pipeWriter;
+
+  nsresult rv = NS_NewPipe(aReaderOut, getter_AddRefs(pipeWriter));
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIOutputStream> compress =
+      new SnappyCompressOutputStream(pipeWriter);
+  return compress.forget();
+}
+
+// Verify the given number of bytes compresses to a smaller number of bytes.
+static void TestCompress(uint32_t aNumBytes) {
+  // Don't permit this test on small data sizes as snappy can slightly
+  // bloat very small content.
+  ASSERT_GT(aNumBytes, 1024u);
+
+  nsCOMPtr<nsIInputStream> pipeReader;
+  nsCOMPtr<nsIOutputStream> compress = CompressPipe(getter_AddRefs(pipeReader));
+  ASSERT_TRUE(compress);
+
+  nsTArray<char> inputData;
+  testing::CreateData(aNumBytes, inputData);
+
+  testing::WriteAllAndClose(compress, inputData);
+
+  nsAutoCString outputData;
+  nsresult rv = NS_ConsumeStream(pipeReader, UINT32_MAX, outputData);
+  ASSERT_TRUE(NS_SUCCEEDED(rv));
+
+  ASSERT_LT(outputData.Length(), inputData.Length());
+}
+
+// Verify that the given number of bytes can be compressed and uncompressed
+// successfully.
+static void TestCompressUncompress(uint32_t aNumBytes) {
+  nsCOMPtr<nsIInputStream> pipeReader;
+  nsCOMPtr<nsIOutputStream> compress = CompressPipe(getter_AddRefs(pipeReader));
+  ASSERT_TRUE(compress);
+
+  nsCOMPtr<nsIInputStream> uncompress =
+      new SnappyUncompressInputStream(pipeReader);
+
+  nsTArray<char> inputData;
+  testing::CreateData(aNumBytes, inputData);
+
+  testing::WriteAllAndClose(compress, inputData);
+
+  nsAutoCString outputData;
+  nsresult rv = NS_ConsumeStream(uncompress, UINT32_MAX, outputData);
+  ASSERT_TRUE(NS_SUCCEEDED(rv));
+
+  ASSERT_EQ(inputData.Length(), outputData.Length());
+  for (uint32_t i = 0; i < inputData.Length(); ++i) {
+    EXPECT_EQ(inputData[i], outputData.get()[i]) << "Byte " << i;
+  }
+}
+
+static void TestUncompressCorrupt(const char* aCorruptData,
+                                  uint32_t aCorruptLength) {
+  nsCOMPtr<nsIInputStream> source;
+  nsresult rv = NS_NewByteInputStream(
+      getter_AddRefs(source), mozilla::Span(aCorruptData, aCorruptLength),
+      NS_ASSIGNMENT_DEPEND);
+  ASSERT_TRUE(NS_SUCCEEDED(rv));
+
+  nsCOMPtr<nsIInputStream> uncompress = new SnappyUncompressInputStream(source);
+
+  nsAutoCString outputData;
+  rv = NS_ConsumeStream(uncompress, UINT32_MAX, outputData);
+  ASSERT_EQ(NS_ERROR_CORRUPTED_CONTENT, rv);
+}
+
+}  // namespace
+
+TEST(SnappyStream, Compress_32k)
+{ TestCompress(32 * 1024); }
+
+TEST(SnappyStream, Compress_64k)
+{ TestCompress(64 * 1024); }
+
+TEST(SnappyStream, Compress_128k)
+{ TestCompress(128 * 1024); }
+
+TEST(SnappyStream, CompressUncompress_0)
+{ TestCompressUncompress(0); }
+
+TEST(SnappyStream, CompressUncompress_1)
+{ TestCompressUncompress(1); }
+
+TEST(SnappyStream, CompressUncompress_32)
+{ TestCompressUncompress(32); }
+
+TEST(SnappyStream, CompressUncompress_1k)
+{ TestCompressUncompress(1024); }
+
+TEST(SnappyStream, CompressUncompress_32k)
+{ TestCompressUncompress(32 * 1024); }
+
+TEST(SnappyStream, CompressUncompress_64k)
+{ TestCompressUncompress(64 * 1024); }
+
+TEST(SnappyStream, CompressUncompress_128k)
+{ TestCompressUncompress(128 * 1024); }
+
+// Test buffers that are not exactly power-of-2 in length to try to
+// exercise more edge cases.  The number 13 is arbitrary.
+
+TEST(SnappyStream, CompressUncompress_256k_less_13)
+{ TestCompressUncompress((256 * 1024) - 13); }
+
+TEST(SnappyStream, CompressUncompress_256k)
+{ TestCompressUncompress(256 * 1024); }
+
+TEST(SnappyStream, CompressUncompress_256k_plus_13)
+{ TestCompressUncompress((256 * 1024) + 13); }
+
+TEST(SnappyStream, UncompressCorruptStreamIdentifier)
+{
+  static const char data[] = "This is not a valid compressed stream";
+  TestUncompressCorrupt(data, strlen(data));
+}
+
+TEST(SnappyStream, UncompressCorruptCompressedDataLength)
+{
+  static const char data[] =
+      "\xff\x06\x00\x00sNaPpY"  // stream identifier
+      "\x00\x99\x00\x00This is not a valid compressed stream";
+  static const uint32_t dataLength = (sizeof(data) / sizeof(const char)) - 1;
+  TestUncompressCorrupt(data, dataLength);
+}
+
+TEST(SnappyStream, UncompressCorruptCompressedDataContent)
+{
+  static const char data[] =
+      "\xff\x06\x00\x00sNaPpY"  // stream identifier
+      "\x00\x25\x00\x00This is not a valid compressed stream";
+  static const uint32_t dataLength = (sizeof(data) / sizeof(const char)) - 1;
+  TestUncompressCorrupt(data, dataLength);
+}