Merge "logd: add a SerializedLogBuffer suitable for compression"

1 files changed, 47 insertions, 0 deletions

diff --git a/logd/CompressionEngine.h b/logd/CompressionEngine.h
new file mode 100644
index 000000000..d760ceaa5
--- /dev/null
+++ b/logd/CompressionEngine.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <span>
+#include <vector>
+
+class CompressionEngine {
+  public:
+    static CompressionEngine& GetInstance();
+
+    virtual ~CompressionEngine(){};
+
+    virtual bool Compress(std::span<uint8_t> in, std::vector<uint8_t>& out) = 0;
+    // Decompress the contents of `in` into `out`.  `out_size` must be set to the decompressed size
+    // of the contents.
+    virtual bool Decompress(const std::vector<uint8_t>& in, std::vector<uint8_t>& out,
+                            size_t out_size) = 0;
+};
+
+class ZlibCompressionEngine : public CompressionEngine {
+  public:
+    bool Compress(std::span<uint8_t> in, std::vector<uint8_t>& out) override;
+    bool Decompress(const std::vector<uint8_t>& in, std::vector<uint8_t>& out,
+                    size_t out_size) override;
+};
+
+class ZstdCompressionEngine : public CompressionEngine {
+  public:
+    bool Compress(std::span<uint8_t> in, std::vector<uint8_t>& out) override;
+    bool Decompress(const std::vector<uint8_t>& in, std::vector<uint8_t>& out,
+                    size_t out_size) override;
+};
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