summaryrefslogtreecommitdiffstats
path: root/src/common/uuid.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/common/uuid.cpp54
1 files changed, 54 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());