More shit

common/hex_util.h

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+// SPDX-FileCopyrightText: 2013 Dolphin Emulator Project
+// SPDX-FileCopyrightText: 2014 Citra Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <string>
+#include <vector>
+#include <fmt/format.h>
+#include "assert.h"
+#include "common_types.h"
+
+namespace Common {
+
+[[nodiscard]] constexpr u8 ToHexNibble(char c) {
+    if (c >= 65 && c <= 70) {
+        return static_cast<u8>(c - 55);
+    }
+
+    if (c >= 97 && c <= 102) {
+        return static_cast<u8>(c - 87);
+    }
+
+    return static_cast<u8>(c - 48);
+}
+
+[[nodiscard]] std::vector<u8> HexStringToVector(std::string_view str, bool little_endian);
+
+template <std::size_t Size, bool le = false>
+[[nodiscard]] constexpr std::array<u8, Size> HexStringToArray(std::string_view str) {
+    ASSERT_MSG(Size * 2 <= str.size(), "Invalid string size");
+
+    std::array<u8, Size> out{};
+    if constexpr (le) {
+        for (std::size_t i = 2 * Size - 2; i <= 2 * Size; i -= 2) {
+            out[i / 2] = static_cast<u8>((ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]));
+        }
+    } else {
+        for (std::size_t i = 0; i < 2 * Size; i += 2) {
+            out[i / 2] = static_cast<u8>((ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]));
+        }
+    }
+    return out;
+}
+
+template <typename ContiguousContainer>
+[[nodiscard]] std::string HexToString(const ContiguousContainer& data, bool upper = true) {
+    static_assert(std::is_same_v<typename ContiguousContainer::value_type, u8>,
+                  "Underlying type within the contiguous container must be u8.");
+
+    constexpr std::size_t pad_width = 2;
+
+    std::string out;
+    out.reserve(std::size(data) * pad_width);
+
+    const auto format_str = fmt::runtime(upper ? "{:02X}" : "{:02x}");
+    for (const u8 c : data) {
+        out += fmt::format(format_str, c);
+    }
+
+    return out;
+}
+
+[[nodiscard]] constexpr std::array<u8, 16> AsArray(const char (&data)[33]) {
+    return HexStringToArray<16>(data);
+}
+
+[[nodiscard]] constexpr std::array<u8, 32> AsArray(const char (&data)[65]) {
+    return HexStringToArray<32>(data);
+}
+
+} // namespace Common