Add spellcheck and word suggestion to the prediction service

third_party/prediction/suggest/policyimpl/dictionary/utils/mmapped_buffer.h

+/*
+ * 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_MMAPPED_BUFFER_H
+#define LATINIME_MMAPPED_BUFFER_H
+
+#include <cstdint>
+#include <memory>
+
+#include "third_party/prediction/defines.h"
+#include "third_party/prediction/utils/byte_array_view.h"
+
+namespace latinime {
+
+class MmappedBuffer {
+ public:
+  typedef std::unique_ptr<const MmappedBuffer> MmappedBufferPtr;
+
+  static MmappedBufferPtr openBuffer(const char* const path,
+                                     const int bufferOffset,
+                                     const int bufferSize,
+                                     const bool isUpdatable);
+
+  // Mmap entire file.
+  static MmappedBufferPtr openBuffer(const char* const path,
+                                     const bool isUpdatable);
+
+  static MmappedBufferPtr openBuffer(const char* const dirPath,
+                                     const char* const fileName,
+                                     const bool isUpdatable);
+
+  ~MmappedBuffer();
+
+  ReadWriteByteArrayView getReadWriteByteArrayView() const {
+    return mByteArrayView;
+  }
+
+  ReadOnlyByteArrayView getReadOnlyByteArrayView() const {
+    return mByteArrayView.getReadOnlyView();
+  }
+
+  AK_FORCE_INLINE bool isUpdatable() const { return mIsUpdatable; }
+
+ private:
+  AK_FORCE_INLINE MmappedBuffer(uint8_t* const buffer,
+                                const int bufferSize,
+                                void* const mmappedBuffer,
+                                const int alignedSize,
+                                const int mmapFd,
+                                const bool isUpdatable)
+      : mByteArrayView(buffer, bufferSize),
+        mMmappedBuffer(mmappedBuffer),
+        mAlignedSize(alignedSize),
+        mMmapFd(mmapFd),
+        mIsUpdatable(isUpdatable) {}
+
+  // Empty file. We have to handle an empty file as a valid part of a
+  // dictionary.
+  AK_FORCE_INLINE MmappedBuffer(const bool isUpdatable)
+      : mByteArrayView(),
+        mMmappedBuffer(nullptr),
+        mAlignedSize(0),
+        mMmapFd(0),
+        mIsUpdatable(isUpdatable) {}
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
+
+  const ReadWriteByteArrayView mByteArrayView;
+  void* const mMmappedBuffer;
+  const int mAlignedSize;
+  const int mMmapFd;
+  const bool mIsUpdatable;
+};
+}
+#endif /* LATINIME_MMAPPED_BUFFER_H */