1 files changed, 70 insertions, 0 deletions
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/extendable_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/extendable_buffer.h
new file mode 100644
index 000000000..d902d19c8
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/extendable_buffer.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2013, 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.
+ */
+
+#ifndef LATINIME_EXTENDABLE_BUFFER_H
+#define LATINIME_EXTENDABLE_BUFFER_H
+
+#include <cstddef>
+#include <stdint.h>
+#include <vector>
+
+#include "defines.h"
+
+namespace latinime {
+
+// This is used as a buffer that can be extended for updatable dictionaries.
+class ExtendableBuffer {
+ public:
+    ExtendableBuffer() : mBuffer(INITIAL_BUFFER_SIZE), mUsedSize(0) {}
+
+   AK_FORCE_INLINE uint8_t *getBuffer() {
+        return  &mBuffer[0];
+    }
+
+    // Return if the buffer is successfully extended or not.
+   AK_FORCE_INLINE bool extendBuffer() {
+        if (mBuffer.size() + EXTEND_BUFFER_SIZE_STEP > MAX_BUFFER_SIZE) {
+            return false;
+        }
+        mBuffer.resize(mBuffer.size() + EXTEND_BUFFER_SIZE_STEP);
+        return true;
+    }
+
+    AK_FORCE_INLINE int getAllocatedSize() const {
+        return mBuffer.size();
+    }
+
+    AK_FORCE_INLINE int getUsedSize() const {
+        return mUsedSize;
+    }
+
+    AK_FORCE_INLINE void clear() {
+        mUsedSize = 0;
+        mBuffer.clear();
+    }
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(ExtendableBuffer);
+
+    static const size_t INITIAL_BUFFER_SIZE;
+    static const size_t MAX_BUFFER_SIZE;
+    static const size_t EXTEND_BUFFER_SIZE_STEP;
+
+    std::vector<uint8_t> mBuffer;
+    int mUsedSize;
+};
+}
+#endif /* LATINIME_MMAPED_BUFFER_H */