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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /mfbt/Compression.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'mfbt/Compression.cpp')
-rw-r--r--mfbt/Compression.cpp73
1 files changed, 73 insertions, 0 deletions
diff --git a/mfbt/Compression.cpp b/mfbt/Compression.cpp
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+/* -*- 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;
+}
+