TYPE3

[iec.git] / src / type3_AndroidCloud / anbox-master / src / anbox / common / variable_length_array.h

diff --git a/src/type3_AndroidCloud/anbox-master/src/anbox/common/variable_length_array.h b/src/type3_AndroidCloud/anbox-master/src/anbox/common/variable_length_array.h
new file mode 100644 (file)
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+++ b/src/type3_AndroidCloud/anbox-master/src/anbox/common/variable_length_array.h
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+/*
+ * Copyright © 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authored by: Alexandros Frantzis <alexandros.frantzis@canonical.com>
+ */
+
+#ifndef ANBOX_COMMON_VARIABLE_LENGTH_ARRAY_H_
+#define ANBOX_COMMON_VARIABLE_LENGTH_ARRAY_H_
+
+#include <sys/types.h>
+#include <memory>
+
+namespace anbox {
+template <size_t BuiltInBufferSize>
+class VariableLengthArray {
+ public:
+  explicit VariableLengthArray(size_t size) : size_{size} {
+    /* Don't call resize if the initial values of member variables are valid */
+    if (size > BuiltInBufferSize) resize(size);
+  }
+
+  void resize(size_t size) {
+    if (size > BuiltInBufferSize)
+      effective_buffer = BufferUPtr{new unsigned char[size], heap_deleter};
+    else
+      effective_buffer = BufferUPtr{builtin_buffer, null_deleter};
+
+    size_ = size;
+  }
+
+  unsigned char* data() const { return effective_buffer.get(); }
+  size_t size() const { return size_; }
+
+ private:
+  typedef std::unique_ptr<unsigned char, void (*)(unsigned char*)> BufferUPtr;
+
+  static void null_deleter(unsigned char*) {}
+  static void heap_deleter(unsigned char* b) { delete[] b; }
+
+  unsigned char builtin_buffer[BuiltInBufferSize];
+  BufferUPtr effective_buffer{builtin_buffer, null_deleter};
+  size_t size_;
+};
+}  // namespace anbox
+
+#endif