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#lockdown Nick.Penwarden (Will update with full description tomorrow) [CL 2984534 by Matthew Griffin in Main branch]
69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/** @file
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@brief Header
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@date 2015
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@author
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Sensics, Inc.
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<http://sensics.com/osvr>
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*/
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// Copyright 2015 Sensics, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef INCLUDED_AlignmentPadding_h_GUID_B916398A_5714_44B8_455A_B38EA1092172
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#define INCLUDED_AlignmentPadding_h_GUID_B916398A_5714_44B8_455A_B38EA1092172
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// Internal Includes
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// - none
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// Library/third-party includes
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// - none
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// Standard includes
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#include <stddef.h>
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namespace osvr {
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namespace common {
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/// @brief Given an alignment in bytes, and a current size of a buffer,
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/// return the number of bytes of padding required to align the next field
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/// to be added to the buffer at the desired alignment within that buffer.
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///
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/// That is, return some padding such that (currentSize + padding) %
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/// alignment == 0 for alignment > 1.
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///
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/// @param alignment Alignment in bytes: both 0 and 1 are accepted to mean
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/// "no alignment"
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/// @param currentSize Current number of bytes in a buffer
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inline size_t computeAlignmentPadding(size_t alignment,
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size_t currentSize) {
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size_t ret = 0;
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if (2 > alignment) {
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/// No alignment requested
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return ret;
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}
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auto leftover = currentSize % alignment;
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if (leftover == 0) {
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/// Buffer is already aligned
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return ret;
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}
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/// Buffer needs some padding
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ret = alignment - leftover;
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return ret;
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}
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} // namespace common
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} // namespace osvr
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#endif // INCLUDED_AlignmentPadding_h_GUID_B916398A_5714_44B8_455A_B38EA1092172
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