common: Move hex string processing to separate file

src/common/hex_util.h

@@ -0,0 +1,35 @@
+// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <fmt/format.h>
+#include "common/common_types.h"
+
+u8 ToHexNibble(char c1);
+
+template <size_t Size, bool le = false>
+std::array<u8, Size> HexStringToArray(std::string_view str) {
+    std::array<u8, Size> out{};
+    if constexpr (le) {
+        for (size_t i = 2 * Size - 2; i <= 2 * Size; i -= 2)
+            out[i / 2] = (ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]);
+    } else {
+        for (size_t i = 0; i < 2 * Size; i += 2)
+            out[i / 2] = (ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]);
+    }
+    return out;
+}
+
+template <size_t Size>
+std::string HexArrayToString(std::array<u8, Size> array, bool upper = true) {
+    std::string out;
+    for (u8 c : array)
+        out += fmt::format(upper ? "{:02X}" : "{:02x}", c);
+    return out;
+}
+
+std::array<u8, 0x10> operator"" _array16(const char* str, size_t len);
+std::array<u8, 0x20> operator"" _array32(const char* str, size_t len);