Add m-esr52 at 52.6.0

1 files changed, 73 insertions, 0 deletions

diff --git a/mfbt/Compression.cpp b/mfbt/Compression.cpp
new file mode 100644
index 0000000000..c114c6c0fc
--- /dev/null
+++ b/mfbt/Compression.cpp
@@ -0,0 +1,73 @@
+/* -*- 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 "mozilla/Compression.h"
+#include "mozilla/CheckedInt.h"
+
+// Without including <string>, MSVC 2015 complains about e.g. the impossibility
+// to convert `const void* const` to `void*` when calling memchr from
+// corecrt_memory.h.
+#include <string>
+
+using namespace mozilla::Compression;
+
+namespace {
+
+#include "lz4.c"
+
+}/* anonymous namespace */
+
+/* Our wrappers */
+
+size_t
+LZ4::compress(const char* aSource, size_t aInputSize, char* aDest)
+{
+  CheckedInt<int> inputSizeChecked = aInputSize;
+  MOZ_ASSERT(inputSizeChecked.isValid());
+  return LZ4_compress(aSource, aDest, inputSizeChecked.value());
+}
+
+size_t
+LZ4::compressLimitedOutput(const char* aSource, size_t aInputSize, char* aDest,
+                           size_t aMaxOutputSize)
+{
+  CheckedInt<int> inputSizeChecked = aInputSize;
+  MOZ_ASSERT(inputSizeChecked.isValid());
+  CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
+  MOZ_ASSERT(maxOutputSizeChecked.isValid());
+  return LZ4_compress_limitedOutput(aSource, aDest, inputSizeChecked.value(),
+                                    maxOutputSizeChecked.value());
+}
+
+bool
+LZ4::decompress(const char* aSource, char* aDest, size_t aOutputSize)
+{
+  CheckedInt<int> outputSizeChecked = aOutputSize;
+  MOZ_ASSERT(outputSizeChecked.isValid());
+  int ret = LZ4_decompress_fast(aSource, aDest, outputSizeChecked.value());
+  return ret >= 0;
+}
+
+bool
+LZ4::decompress(const char* aSource, size_t aInputSize, char* aDest,
+                size_t aMaxOutputSize, size_t* aOutputSize)
+{
+  CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
+  MOZ_ASSERT(maxOutputSizeChecked.isValid());
+  CheckedInt<int> inputSizeChecked = aInputSize;
+  MOZ_ASSERT(inputSizeChecked.isValid());
+
+  int ret = LZ4_decompress_safe(aSource, aDest, inputSizeChecked.value(),
+                                maxOutputSizeChecked.value());
+  if (ret >= 0) {
+    *aOutputSize = ret;
+    return true;
+  }
+
+  *aOutputSize = 0;
+  return false;
+}
+