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Merge pull request #6813 from Morph1984/hex-string-to-uuid
common: uuid: Add hex string to UUID constructor
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commit
e1a92db519
@ -6,10 +6,64 @@
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#include <fmt/format.h>
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#include "common/assert.h"
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#include "common/uuid.h"
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namespace Common {
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namespace {
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bool IsHexDigit(char c) {
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return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
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}
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u8 HexCharToByte(char c) {
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if (c >= '0' && c <= '9') {
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return static_cast<u8>(c - '0');
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}
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if (c >= 'a' && c <= 'f') {
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return static_cast<u8>(c - 'a' + 10);
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}
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if (c >= 'A' && c <= 'F') {
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return static_cast<u8>(c - 'A' + 10);
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}
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ASSERT_MSG(false, "{} is not a hexadecimal digit!", c);
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return u8{0};
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}
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} // Anonymous namespace
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u128 HexStringToU128(std::string_view hex_string) {
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const size_t length = hex_string.length();
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// Detect "0x" prefix.
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const bool has_0x_prefix = length > 2 && hex_string[0] == '0' && hex_string[1] == 'x';
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const size_t offset = has_0x_prefix ? 2 : 0;
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// Check length.
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if (length > 32 + offset) {
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ASSERT_MSG(false, "hex_string has more than 32 hexadecimal characters!");
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return INVALID_UUID;
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}
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u64 lo = 0;
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u64 hi = 0;
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for (size_t i = 0; i < length - offset; ++i) {
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const char c = hex_string[length - 1 - i];
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if (!IsHexDigit(c)) {
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ASSERT_MSG(false, "{} is not a hexadecimal digit!", c);
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return INVALID_UUID;
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}
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if (i < 16) {
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lo |= u64{HexCharToByte(c)} << (i * 4);
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}
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if (i >= 16) {
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hi |= u64{HexCharToByte(c)} << ((i - 16) * 4);
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}
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}
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return u128{lo, hi};
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}
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UUID UUID::Generate() {
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std::random_device device;
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std::mt19937 gen(device());
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@ -5,6 +5,7 @@
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#pragma once
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#include <string>
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#include <string_view>
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#include "common/common_types.h"
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@ -12,12 +13,30 @@ namespace Common {
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constexpr u128 INVALID_UUID{{0, 0}};
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/**
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* Converts a hex string to a 128-bit unsigned integer.
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*
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* The hex string can be formatted in lowercase or uppercase, with or without the "0x" prefix.
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*
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* This function will assert and return INVALID_UUID under the following conditions:
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* - If the hex string is more than 32 characters long
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* - If the hex string contains non-hexadecimal characters
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*
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* @param hex_string Hexadecimal string
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*
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* @returns A 128-bit unsigned integer if successfully converted, INVALID_UUID otherwise.
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*/
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[[nodiscard]] u128 HexStringToU128(std::string_view hex_string);
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struct UUID {
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// UUIDs which are 0 are considered invalid!
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u128 uuid;
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UUID() = default;
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constexpr explicit UUID(const u128& id) : uuid{id} {}
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constexpr explicit UUID(const u64 lo, const u64 hi) : uuid{{lo, hi}} {}
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explicit UUID(std::string_view hex_string) {
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uuid = HexStringToU128(hex_string);
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}
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[[nodiscard]] constexpr explicit operator bool() const {
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return uuid != INVALID_UUID;
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