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common: uuid: Return an invalid UUID if conversion from string fails
The string constructor of UUID states: Should the input string not meet the above requirements, an assert will be triggered and an invalid UUID is set instead.
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25db62ce15
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1 changed files with 39 additions and 14 deletions
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@ -3,6 +3,7 @@
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// Refer to the license.txt file included.
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#include <bit>
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#include <optional>
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#include <random>
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#include <fmt/format.h>
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@ -18,7 +19,7 @@ namespace {
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constexpr size_t RawStringSize = sizeof(UUID) * 2;
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constexpr size_t FormattedStringSize = RawStringSize + 4;
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u8 HexCharToByte(char c) {
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std::optional<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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@ -29,15 +30,19 @@ u8 HexCharToByte(char c) {
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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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return std::nullopt;
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}
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std::array<u8, 0x10> ConstructFromRawString(std::string_view raw_string) {
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std::array<u8, 0x10> uuid;
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for (size_t i = 0; i < RawStringSize; i += 2) {
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uuid[i / 2] =
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static_cast<u8>((HexCharToByte(raw_string[i]) << 4) | HexCharToByte(raw_string[i + 1]));
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const auto upper = HexCharToByte(raw_string[i]);
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const auto lower = HexCharToByte(raw_string[i + 1]);
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if (!upper || !lower) {
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return {};
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}
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uuid[i / 2] = static_cast<u8>((*upper << 4) | *lower);
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}
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return uuid;
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@ -52,40 +57,60 @@ std::array<u8, 0x10> ConstructFromFormattedString(std::string_view formatted_str
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const auto* str = formatted_string.data();
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for (; i < 4; ++i) {
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uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
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uuid[i] |= HexCharToByte(*(str++));
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const auto upper = HexCharToByte(*(str++));
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const auto lower = HexCharToByte(*(str++));
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if (!upper || !lower) {
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return {};
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}
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uuid[i] = static_cast<u8>((*upper << 4) | *lower);
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}
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// Process the next 4 characters.
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++str;
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for (; i < 6; ++i) {
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uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
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uuid[i] |= HexCharToByte(*(str++));
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const auto upper = HexCharToByte(*(str++));
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const auto lower = HexCharToByte(*(str++));
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if (!upper || !lower) {
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return {};
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}
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uuid[i] = static_cast<u8>((*upper << 4) | *lower);
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}
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// Process the next 4 characters.
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++str;
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for (; i < 8; ++i) {
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uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
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uuid[i] |= HexCharToByte(*(str++));
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const auto upper = HexCharToByte(*(str++));
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const auto lower = HexCharToByte(*(str++));
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if (!upper || !lower) {
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return {};
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}
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uuid[i] = static_cast<u8>((*upper << 4) | *lower);
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}
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// Process the next 4 characters.
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++str;
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for (; i < 10; ++i) {
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uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
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uuid[i] |= HexCharToByte(*(str++));
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const auto upper = HexCharToByte(*(str++));
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const auto lower = HexCharToByte(*(str++));
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if (!upper || !lower) {
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return {};
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}
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uuid[i] = static_cast<u8>((*upper << 4) | *lower);
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}
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// Process the last 12 characters.
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++str;
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for (; i < 16; ++i) {
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uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
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uuid[i] |= HexCharToByte(*(str++));
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const auto upper = HexCharToByte(*(str++));
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const auto lower = HexCharToByte(*(str++));
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if (!upper || !lower) {
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return {};
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}
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uuid[i] = static_cast<u8>((*upper << 4) | *lower);
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}
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return uuid;
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