init

device/cppcodec/data/raw_result_buffer.hpp

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+/**
+ *  Copyright (C) 2015 Topology LP
+ *  All rights reserved.
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to
+ *  deal in the Software without restriction, including without limitation the
+ *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ *  sell copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#ifndef CPPCODEC_DETAIL_RAW_RESULT_BUFFER
+#define CPPCODEC_DETAIL_RAW_RESULT_BUFFER
+
+#include <stdint.h> // for size_t
+#include <stdlib.h> // for abort()
+
+#include "access.hpp"
+
+namespace cppcodec {
+namespace data {
+
+class raw_result_buffer
+{
+public:
+    raw_result_buffer(char* data, size_t capacity)
+        : m_ptr(data + capacity)
+        , m_begin(data)
+    {
+    }
+
+    CPPCODEC_ALWAYS_INLINE void push_back(char c) { *m_ptr = c; ++m_ptr; }
+    CPPCODEC_ALWAYS_INLINE size_t size() const { return m_ptr - m_begin; }
+    CPPCODEC_ALWAYS_INLINE void resize(size_t size) { m_ptr = m_begin + size; }
+
+private:
+    char* m_ptr;
+    char* m_begin;
+};
+
+
+template <> inline void init<raw_result_buffer>(
+        raw_result_buffer& result, empty_result_state&, size_t capacity)
+{
+    // This version of init() doesn't do a reserve(), and instead checks whether the
+    // initial size (capacity) is enough before resetting m_ptr to m_begin.
+    // The codec is expected not to exceed this capacity.
+    if (capacity > result.size()) {
+        abort();
+    }
+    result.resize(0);
+}
+template <> inline void finish<raw_result_buffer>(raw_result_buffer&, empty_result_state&) { }
+
+} // namespace data
+} // namespace cppcodec
+
+#endif