Diff: MaximInterfaceCore/ChangeSizeType.hpp

Revision:

7:9cd16581b578

Child:

8:5ea891c7d1a1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MaximInterfaceCore/ChangeSizeType.hpp	Mon Jul 22 11:44:07 2019 -0500
@@ -0,0 +1,76 @@
+/*******************************************************************************
+* Copyright (C) 2017 Maxim Integrated Products, Inc., 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 MAXIM INTEGRATED 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.
+*
+* Except as contained in this notice, the name of Maxim Integrated
+* Products, Inc. shall not be used except as stated in the Maxim Integrated
+* Products, Inc. Branding Policy.
+*
+* The mere transfer of this software does not imply any licenses
+* of trade secrets, proprietary technology, copyrights, patents,
+* trademarks, maskwork rights, or any other form of intellectual
+* property whatsoever. Maxim Integrated Products, Inc. retains all
+* ownership rights.
+*******************************************************************************/
+
+#ifndef MaximInterfaceCore_ChangeSizeType
+#define MaximInterfaceCore_ChangeSizeType
+
+#include <stdint.h>
+#include <algorithm>
+#include <limits>
+#include "span.hpp"
+#include "system_error.hpp"
+
+namespace MaximInterfaceCore {
+
+/// @brief
+/// Adapts functions taking an array pointer and size where the size type is
+/// nonstandard.
+/// @tparam NewSize Nonstandard size type.
+/// @tparam Func Must be callable as func(Data *, NewSize).
+/// @tparam Data Array element type.
+/// @param func Callback for processing chunks of data.
+/// @param data Data to process with callback.
+template <typename NewSize, typename Func, typename Data>
+error_code changeSizeType(Func func, span<Data> data) {
+  typedef typename span<Data>::index_type DataSize;
+
+  error_code result;
+  // Check if NewSize can represent the maximum value of DataSize.
+  if (static_cast<uintmax_t>(std::numeric_limits<DataSize>::max()) >
+      static_cast<uintmax_t>(std::numeric_limits<NewSize>::max())) {
+    DataSize dataIdx = 0;
+    do {
+      const span<Data> chunk = data.subspan(
+          dataIdx, std::min<DataSize>(data.size() - dataIdx,
+                                      std::numeric_limits<NewSize>::max()));
+      result = func(chunk.data(), static_cast<NewSize>(chunk.size()));
+      dataIdx += chunk.size();
+    } while (dataIdx < data.size() && !result);
+  } else {
+    result = func(data.data(), static_cast<NewSize>(data.size()));
+  }
+  return result;
+}
+
+} // namespace MaximInterfaceCore
+
+#endif
\ No newline at end of file