Squashed 'src/ipc/libmultiprocess/' content from commit 35944ffd23fa

git-subtree-dir: src/ipc/libmultiprocess
git-subtree-split: 35944ffd23fa26652b82210351d50e896ce16c8f

include/mp/type-char.h

@@ -0,0 +1,36 @@
+// Copyright (c) 2025 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef MP_PROXY_TYPE_CHAR_H
+#define MP_PROXY_TYPE_CHAR_H
+
+#include <mp/util.h>
+
+namespace mp {
+template <typename Output, size_t size>
+void CustomBuildField(TypeList<const unsigned char*>,
+    Priority<3>,
+    InvokeContext& invoke_context,
+    const unsigned char (&value)[size],
+    Output&& output)
+{
+    auto result = output.init(size);
+    memcpy(result.begin(), value, size);
+}
+
+template <size_t size, typename Input, typename ReadDest>
+decltype(auto) CustomReadField(TypeList<unsigned char[size]>,
+    Priority<1>,
+    InvokeContext& invoke_context,
+    Input&& input,
+    ReadDest&& read_dest)
+{
+    return read_dest.update([&](auto& value) {
+        auto data = input.get();
+        memcpy(value, data.begin(), size);
+    });
+}
+} // namespace mp
+
+#endif // MP_PROXY_TYPE_CHAR_H