1 files changed, 55 insertions, 0 deletions
diff --git a/logd/SerializedData.h b/logd/SerializedData.h
new file mode 100644
index 0000000000..d3d1e18cf9
--- /dev/null
+++ b/logd/SerializedData.h
@@ -0,0 +1,55 @@
+/*
+ * 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 <sys/types.h>
+
+#include <algorithm>
+#include <memory>
+
+// This class is used instead of std::string or std::vector because their clear(), erase(), etc
+// functions don't actually deallocate.  shrink_to_fit() does deallocate but is not guaranteed to
+// work and swapping with an empty string/vector is clunky.
+class SerializedData {
+  public:
+    SerializedData() {}
+    SerializedData(size_t size) : data_(new uint8_t[size]), size_(size) {}
+
+    void Resize(size_t new_size) {
+        if (size_ == 0) {
+            data_.reset(new uint8_t[new_size]);
+            size_ = new_size;
+        } else if (new_size == 0) {
+            data_.reset();
+            size_ = 0;
+        } else if (new_size != size_) {
+            std::unique_ptr<uint8_t[]> new_data(new uint8_t[new_size]);
+            size_t copy_size = std::min(size_, new_size);
+            memcpy(new_data.get(), data_.get(), copy_size);
+            data_.swap(new_data);
+            size_ = new_size;
+        }
+    }
+
+    uint8_t* data() { return data_.get(); }
+    const uint8_t* data() const { return data_.get(); }
+    size_t size() const { return size_; }
+
+  private:
+    std::unique_ptr<uint8_t[]> data_;
+    size_t size_ = 0;
+};
+\ No newline at end of file