1 files changed, 182 insertions, 0 deletions
diff --git a/src/common/new_uuid.cpp b/src/common/new_uuid.cpp
new file mode 100644
index 000000000..0442681c8
--- /dev/null
+++ b/src/common/new_uuid.cpp
@@ -0,0 +1,182 @@
+// Copyright 2022 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <bit>
+#include <random>
+
+#include <fmt/format.h>
+
+#include "common/assert.h"
+#include "common/new_uuid.h"
+#include "common/tiny_mt.h"
+
+namespace Common {
+
+namespace {
+
+constexpr size_t RawStringSize = sizeof(NewUUID) * 2;
+constexpr size_t FormattedStringSize = RawStringSize + 4;
+
+u8 HexCharToByte(char c) {
+    if (c >= '0' && c <= '9') {
+        return static_cast<u8>(c - '0');
+    }
+    if (c >= 'a' && c <= 'f') {
+        return static_cast<u8>(c - 'a' + 10);
+    }
+    if (c >= 'A' && c <= 'F') {
+        return static_cast<u8>(c - 'A' + 10);
+    }
+    ASSERT_MSG(false, "{} is not a hexadecimal digit!", c);
+    return u8{0};
+}
+
+std::array<u8, 0x10> ConstructFromRawString(std::string_view raw_string) {
+    std::array<u8, 0x10> uuid;
+
+    for (size_t i = 0; i < RawStringSize; i += 2) {
+        uuid[i / 2] =
+            static_cast<u8>((HexCharToByte(raw_string[i]) << 4) | HexCharToByte(raw_string[i + 1]));
+    }
+
+    return uuid;
+}
+
+std::array<u8, 0x10> ConstructFromFormattedString(std::string_view formatted_string) {
+    std::array<u8, 0x10> uuid;
+
+    size_t i = 0;
+
+    // Process the first 8 characters.
+    const auto* str = formatted_string.data();
+
+    for (; i < 4; ++i) {
+        uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
+        uuid[i] |= HexCharToByte(*(str++));
+    }
+
+    // Process the next 4 characters.
+    ++str;
+
+    for (; i < 6; ++i) {
+        uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
+        uuid[i] |= HexCharToByte(*(str++));
+    }
+
+    // Process the next 4 characters.
+    ++str;
+
+    for (; i < 8; ++i) {
+        uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
+        uuid[i] |= HexCharToByte(*(str++));
+    }
+
+    // Process the next 4 characters.
+    ++str;
+
+    for (; i < 10; ++i) {
+        uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
+        uuid[i] |= HexCharToByte(*(str++));
+    }
+
+    // Process the last 12 characters.
+    ++str;
+
+    for (; i < 16; ++i) {
+        uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
+        uuid[i] |= HexCharToByte(*(str++));
+    }
+
+    return uuid;
+}
+
+std::array<u8, 0x10> ConstructUUID(std::string_view uuid_string) {
+    const auto length = uuid_string.length();
+
+    if (length == 0) {
+        return {};
+    }
+
+    // Check if the input string contains 32 hexadecimal characters.
+    if (length == RawStringSize) {
+        return ConstructFromRawString(uuid_string);
+    }
+
+    // Check if the input string has the length of a RFC 4122 formatted UUID string.
+    if (length == FormattedStringSize) {
+        return ConstructFromFormattedString(uuid_string);
+    }
+
+    ASSERT_MSG(false, "UUID string has an invalid length of {} characters!", length);
+
+    return {};
+}
+
+} // Anonymous namespace
+
+NewUUID::NewUUID(std::string_view uuid_string) : uuid{ConstructUUID(uuid_string)} {}
+
+std::string NewUUID::RawString() const {
+    return fmt::format("{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}"
+                       "{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
+                       uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7],
+                       uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14],
+                       uuid[15]);
+}
+
+std::string NewUUID::FormattedString() const {
+    return fmt::format("{:02x}{:02x}{:02x}{:02x}"
+                       "-{:02x}{:02x}-{:02x}{:02x}-{:02x}{:02x}-"
+                       "{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
+                       uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7],
+                       uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14],
+                       uuid[15]);
+}
+
+size_t NewUUID::Hash() const noexcept {
+    u64 hash;
+    u64 temp;
+
+    std::memcpy(&hash, uuid.data(), sizeof(u64));
+    std::memcpy(&temp, uuid.data() + 8, sizeof(u64));
+
+    return hash ^ std::rotl(temp, 1);
+}
+
+NewUUID NewUUID::MakeRandom() {
+    std::random_device device;
+
+    return MakeRandomWithSeed(device());
+}
+
+NewUUID NewUUID::MakeRandomWithSeed(u32 seed) {
+    // Create and initialize our RNG.
+    TinyMT rng;
+    rng.Initialize(seed);
+
+    NewUUID uuid;
+
+    // Populate the UUID with random bytes.
+    rng.GenerateRandomBytes(uuid.uuid.data(), sizeof(NewUUID));
+
+    return uuid;
+}
+
+NewUUID NewUUID::MakeRandomRFC4122V4() {
+    auto uuid = MakeRandom();
+
+    // According to Proposed Standard RFC 4122 Section 4.4, we must:
+
+    // 1. Set the two most significant bits (bits 6 and 7) of the
+    //    clock_seq_hi_and_reserved to zero and one, respectively.
+    uuid.uuid[8] = 0x80 | (uuid.uuid[8] & 0x3F);
+
+    // 2. Set the four most significant bits (bits 12 through 15) of the
+    //    time_hi_and_version field to the 4-bit version number from Section 4.1.3.
+    uuid.uuid[6] = 0x40 | (uuid.uuid[6] & 0xF);
+
+    return uuid;
+}
+
+} // namespace Common