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common: uuid: Return an invalid UUID if conversion from string fails

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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.
This commit is contained in:
Morph 2022-02-05 13:07:51 -05:00
parent 25db62ce15
commit ec4d7f71fe
1 changed files with 39 additions and 14 deletions
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53
src/common/uuid.cpp
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@ -3,6 +3,7 @@
// Refer to the license.txt file included.
#include <bit>
#include <optional>
#include <random>
#include <fmt/format.h>
@ -18,7 +19,7 @@ namespace {
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');
}
@ -29,15 +30,19 @@ 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;
}
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]));
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;
@ -52,40 +57,60 @@ std::array<u8, 0x10> ConstructFromFormattedString(std::string_view formatted_str
const auto* str = formatted_string.data();
for (; i < 4; ++i) {
uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
uuid[i] |= HexCharToByte(*(str++));
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) {
uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
uuid[i] |= HexCharToByte(*(str++));
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 < 8; ++i) {
uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
uuid[i] |= HexCharToByte(*(str++));
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 < 10; ++i) {
uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
uuid[i] |= HexCharToByte(*(str++));
const auto upper = HexCharToByte(*(str++));
const auto lower = HexCharToByte(*(str++));
if (!upper || !lower) {
return {};
}
uuid[i] = static_cast<u8>((*upper << 4) | *lower);
}
// Process the last 12 characters.
++str;
for (; i < 16; ++i) {
uuid[i] = static_cast<u8>((HexCharToByte(*(str++)) << 4));
uuid[i] |= HexCharToByte(*(str++));
const auto upper = HexCharToByte(*(str++));
const auto lower = HexCharToByte(*(str++));
if (!upper || !lower) {
return {};
}
uuid[i] = static_cast<u8>((*upper << 4) | *lower);
}
return uuid;