Add memory view class for int and uint8_t.

Bug: 16691311
Change-Id: I32eb692cdb758861e24b772fdcda57642b95ae1b

1 files changed, 82 insertions, 0 deletions

diff --git a/native/jni/src/utils/byte_array_view.h b/native/jni/src/utils/byte_array_view.h
new file mode 100644
index 000000000..d13999c16
--- /dev/null
+++ b/native/jni/src/utils/byte_array_view.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2014 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_BYTE_ARRAY_VIEW_H
+#define LATINIME_BYTE_ARRAY_VIEW_H
+
+#include <cstdint>
+#include <cstdlib>
+
+#include "defines.h"
+
+namespace latinime {
+
+/**
+ * Helper class used to keep track of read accesses for a given memory region.
+ */
+class ReadOnlyByteArrayView {
+ public:
+    ReadOnlyByteArrayView() : mPtr(nullptr), mSize(0) {}
+
+    ReadOnlyByteArrayView(const uint8_t *const ptr, const size_t size)
+            : mPtr(ptr), mSize(size) {}
+
+    AK_FORCE_INLINE size_t size() const {
+        return mSize;
+    }
+
+    AK_FORCE_INLINE const uint8_t *data() const {
+        return mPtr;
+    }
+
+ private:
+    DISALLOW_ASSIGNMENT_OPERATOR(ReadOnlyByteArrayView);
+
+    const uint8_t *const mPtr;
+    const size_t mSize;
+};
+
+/**
+ * Helper class used to keep track of read-write accesses for a given memory region.
+ */
+class ReadWriteByteArrayView {
+ public:
+    ReadWriteByteArrayView() : mPtr(nullptr), mSize(0) {}
+
+    ReadWriteByteArrayView(uint8_t *const ptr, const size_t size)
+            : mPtr(ptr), mSize(size) {}
+
+    AK_FORCE_INLINE size_t size() const {
+        return mSize;
+    }
+
+    AK_FORCE_INLINE uint8_t *data() const {
+        return mPtr;
+    }
+
+    AK_FORCE_INLINE ReadOnlyByteArrayView getReadOnlyView() const {
+        return ReadOnlyByteArrayView(mPtr, mSize);
+    }
+
+ private:
+    DISALLOW_ASSIGNMENT_OPERATOR(ReadWriteByteArrayView);
+
+    uint8_t *const mPtr;
+    const size_t mSize;
+};
+
+} // namespace latinime
+#endif // LATINIME_BYTE_ARRAY_VIEW_H