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-rw-r--r--src/common/uuid.cpp208
1 files changed, 167 insertions, 41 deletions
diff --git a/src/common/uuid.cpp b/src/common/uuid.cpp
index d7435a6e9..2b6a530e3 100644
--- a/src/common/uuid.cpp
+++ b/src/common/uuid.cpp
@@ -1,23 +1,25 @@
-// Copyright 2018 yuzu Emulator Project
+// Copyright 2022 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
+#include <bit>
+#include <optional>
#include <random>
#include <fmt/format.h>
#include "common/assert.h"
+#include "common/tiny_mt.h"
#include "common/uuid.h"
namespace Common {
namespace {
-bool IsHexDigit(char c) {
- return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
-}
+constexpr size_t RawStringSize = sizeof(UUID) * 2;
+constexpr size_t FormattedStringSize = RawStringSize + 4;
-u8 HexCharToByte(char c) {
+std::optional<u8> HexCharToByte(char c) {
if (c >= '0' && c <= '9') {
return static_cast<u8>(c - '0');
}
@@ -28,60 +30,184 @@ u8 HexCharToByte(char c) {
return static_cast<u8>(c - 'A' + 10);
}
ASSERT_MSG(false, "{} is not a hexadecimal digit!", c);
- return u8{0};
+ return std::nullopt;
}
-} // Anonymous namespace
+std::array<u8, 0x10> ConstructFromRawString(std::string_view raw_string) {
+ std::array<u8, 0x10> uuid;
+
+ for (size_t i = 0; i < RawStringSize; i += 2) {
+ const auto upper = HexCharToByte(raw_string[i]);
+ const auto lower = HexCharToByte(raw_string[i + 1]);
+ if (!upper || !lower) {
+ return {};
+ }
+ uuid[i / 2] = static_cast<u8>((*upper << 4) | *lower);
+ }
+
+ return uuid;
+}
-u128 HexStringToU128(std::string_view hex_string) {
- const size_t length = hex_string.length();
+std::array<u8, 0x10> ConstructFromFormattedString(std::string_view formatted_string) {
+ std::array<u8, 0x10> uuid;
- // Detect "0x" prefix.
- const bool has_0x_prefix = length > 2 && hex_string[0] == '0' && hex_string[1] == 'x';
- const size_t offset = has_0x_prefix ? 2 : 0;
+ size_t i = 0;
- // Check length.
- if (length > 32 + offset) {
- ASSERT_MSG(false, "hex_string has more than 32 hexadecimal characters!");
- return INVALID_UUID;
+ // Process the first 8 characters.
+ const auto* str = formatted_string.data();
+
+ for (; i < 4; ++i) {
+ const auto upper = HexCharToByte(*(str++));
+ const auto lower = HexCharToByte(*(str++));
+ if (!upper || !lower) {
+ return {};
+ }
+ uuid[i] = static_cast<u8>((*upper << 4) | *lower);
+ }
+
+ // Process the next 4 characters.
+ ++str;
+
+ for (; i < 6; ++i) {
+ const auto upper = HexCharToByte(*(str++));
+ const auto lower = HexCharToByte(*(str++));
+ if (!upper || !lower) {
+ return {};
+ }
+ uuid[i] = static_cast<u8>((*upper << 4) | *lower);
}
- u64 lo = 0;
- u64 hi = 0;
- for (size_t i = 0; i < length - offset; ++i) {
- const char c = hex_string[length - 1 - i];
- if (!IsHexDigit(c)) {
- ASSERT_MSG(false, "{} is not a hexadecimal digit!", c);
- return INVALID_UUID;
+ // Process the next 4 characters.
+ ++str;
+
+ for (; i < 8; ++i) {
+ const auto upper = HexCharToByte(*(str++));
+ const auto lower = HexCharToByte(*(str++));
+ if (!upper || !lower) {
+ return {};
}
- if (i < 16) {
- lo |= u64{HexCharToByte(c)} << (i * 4);
+ uuid[i] = static_cast<u8>((*upper << 4) | *lower);
+ }
+
+ // Process the next 4 characters.
+ ++str;
+
+ for (; i < 10; ++i) {
+ const auto upper = HexCharToByte(*(str++));
+ const auto lower = HexCharToByte(*(str++));
+ if (!upper || !lower) {
+ return {};
}
- if (i >= 16) {
- hi |= u64{HexCharToByte(c)} << ((i - 16) * 4);
+ uuid[i] = static_cast<u8>((*upper << 4) | *lower);
+ }
+
+ // Process the last 12 characters.
+ ++str;
+
+ for (; i < 16; ++i) {
+ const auto upper = HexCharToByte(*(str++));
+ const auto lower = HexCharToByte(*(str++));
+ if (!upper || !lower) {
+ return {};
}
+ uuid[i] = static_cast<u8>((*upper << 4) | *lower);
+ }
+
+ 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);
}
- return u128{lo, hi};
+
+ ASSERT_MSG(false, "UUID string has an invalid length of {} characters!", length);
+
+ return {};
+}
+
+} // Anonymous namespace
+
+UUID::UUID(std::string_view uuid_string) : uuid{ConstructUUID(uuid_string)} {}
+
+std::string UUID::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 UUID::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 UUID::Hash() const noexcept {
+ u64 upper_hash;
+ u64 lower_hash;
+
+ std::memcpy(&upper_hash, uuid.data(), sizeof(u64));
+ std::memcpy(&lower_hash, uuid.data() + sizeof(u64), sizeof(u64));
+
+ return upper_hash ^ std::rotl(lower_hash, 1);
}
-UUID UUID::Generate() {
+u128 UUID::AsU128() const {
+ u128 uuid_old;
+ std::memcpy(&uuid_old, uuid.data(), sizeof(UUID));
+ return uuid_old;
+}
+
+UUID UUID::MakeRandom() {
std::random_device device;
- std::mt19937 gen(device());
- std::uniform_int_distribution<u64> distribution(1, std::numeric_limits<u64>::max());
- return UUID{distribution(gen), distribution(gen)};
+
+ return MakeRandomWithSeed(device());
}
-std::string UUID::Format() const {
- return fmt::format("{:016x}{:016x}", uuid[1], uuid[0]);
+UUID UUID::MakeRandomWithSeed(u32 seed) {
+ // Create and initialize our RNG.
+ TinyMT rng;
+ rng.Initialize(seed);
+
+ UUID uuid;
+
+ // Populate the UUID with random bytes.
+ rng.GenerateRandomBytes(uuid.uuid.data(), sizeof(UUID));
+
+ return uuid;
}
-std::string UUID::FormatSwitch() const {
- std::array<u8, 16> s{};
- std::memcpy(s.data(), uuid.data(), sizeof(u128));
- return fmt::format("{:02x}{:02x}{:02x}{:02x}-{:02x}{:02x}-{:02x}{:02x}-{:02x}{:02x}-{:02x}{"
- ":02x}{:02x}{:02x}{:02x}{:02x}",
- s[0], s[1], s[2], s[3], s[4], s[5], s[6], s[7], s[8], s[9], s[10], s[11],
- s[12], s[13], s[14], s[15]);
+UUID UUID::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