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authorbunnei <bunneidev@gmail.com>2021-08-05 22:29:11 +0200
committerGitHub <noreply@github.com>2021-08-05 22:29:11 +0200
commite1a92db519db43b365802e0065a9cb8927c241fd (patch)
tree2efb546579680414634b8eeafcec82ac20981f9e /src
parentMerge pull request #6819 from Morph1984/i-am-dumb (diff)
parentcommon: uuid: Add hex string to UUID constructor (diff)
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Diffstat (limited to 'src')
-rw-r--r--src/common/uuid.cpp54
-rw-r--r--src/common/uuid.h19
2 files changed, 73 insertions, 0 deletions
diff --git a/src/common/uuid.cpp b/src/common/uuid.cpp
index 18303a1e3..d7435a6e9 100644
--- a/src/common/uuid.cpp
+++ b/src/common/uuid.cpp
@@ -6,10 +6,64 @@
#include <fmt/format.h>
+#include "common/assert.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');
+}
+
+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};
+}
+
+} // Anonymous namespace
+
+u128 HexStringToU128(std::string_view hex_string) {
+ const size_t length = hex_string.length();
+
+ // 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;
+
+ // Check length.
+ if (length > 32 + offset) {
+ ASSERT_MSG(false, "hex_string has more than 32 hexadecimal characters!");
+ return INVALID_UUID;
+ }
+
+ 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;
+ }
+ if (i < 16) {
+ lo |= u64{HexCharToByte(c)} << (i * 4);
+ }
+ if (i >= 16) {
+ hi |= u64{HexCharToByte(c)} << ((i - 16) * 4);
+ }
+ }
+ return u128{lo, hi};
+}
+
UUID UUID::Generate() {
std::random_device device;
std::mt19937 gen(device());
diff --git a/src/common/uuid.h b/src/common/uuid.h
index 0ffa37e7c..aeb36939a 100644
--- a/src/common/uuid.h
+++ b/src/common/uuid.h
@@ -5,6 +5,7 @@
#pragma once
#include <string>
+#include <string_view>
#include "common/common_types.h"
@@ -12,12 +13,30 @@ namespace Common {
constexpr u128 INVALID_UUID{{0, 0}};
+/**
+ * Converts a hex string to a 128-bit unsigned integer.
+ *
+ * The hex string can be formatted in lowercase or uppercase, with or without the "0x" prefix.
+ *
+ * This function will assert and return INVALID_UUID under the following conditions:
+ * - If the hex string is more than 32 characters long
+ * - If the hex string contains non-hexadecimal characters
+ *
+ * @param hex_string Hexadecimal string
+ *
+ * @returns A 128-bit unsigned integer if successfully converted, INVALID_UUID otherwise.
+ */
+[[nodiscard]] u128 HexStringToU128(std::string_view hex_string);
+
struct UUID {
// UUIDs which are 0 are considered invalid!
u128 uuid;
UUID() = default;
constexpr explicit UUID(const u128& id) : uuid{id} {}
constexpr explicit UUID(const u64 lo, const u64 hi) : uuid{{lo, hi}} {}
+ explicit UUID(std::string_view hex_string) {
+ uuid = HexStringToU128(hex_string);
+ }
[[nodiscard]] constexpr explicit operator bool() const {
return uuid != INVALID_UUID;