1 files changed, 75 insertions, 0 deletions
diff --git a/src/uuid.cpp b/src/uuid.cpp
new file mode 100644
index 0000000..a53bf27
--- /dev/null
+++ b/src/uuid.cpp
@@ -0,0 +1,75 @@
+#include <erebos/uuid.h>
+
+#include <stdexcept>
+
+#include <openssl/rand.h>
+
+using namespace erebos;
+
+using std::nullopt;
+using std::optional;
+using std::runtime_error;
+using std::string;
+
+static const size_t UUID_STR_LEN = 36;
+
+static const char * FORMAT_STRING = "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-"
+	"%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx";
+
+UUID::UUID(const string & str)
+{
+	if (!fromString(str, *this))
+		throw runtime_error("invalid UUID");
+}
+
+UUID::operator string() const
+{
+	string str(UUID_STR_LEN, '\0');
+	snprintf(str.data(), UUID_STR_LEN + 1, FORMAT_STRING,
+			uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7],
+			uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
+	return str;
+}
+
+optional<UUID> UUID::fromString(const string & str)
+{
+	UUID u;
+	if (fromString(str, u))
+		return u;
+	return nullopt;
+}
+
+bool UUID::fromString(const string & str, UUID & u)
+{
+	if (str.size() != UUID_STR_LEN)
+		return false;
+
+	if (sscanf(str.c_str(), FORMAT_STRING,
+				&u.uuid[0], &u.uuid[1], &u.uuid[2], &u.uuid[3], &u.uuid[4], &u.uuid[5], &u.uuid[6], &u.uuid[7],
+				&u.uuid[8], &u.uuid[9], &u.uuid[10], &u.uuid[11], &u.uuid[12], &u.uuid[13], &u.uuid[14], &u.uuid[15])
+			!= 16)
+		return false;
+
+	return true;
+}
+
+UUID UUID::generate()
+{
+	UUID u;
+	if (RAND_bytes(u.uuid.data(), u.uuid.size()) != 1)
+		throw runtime_error("failed to generate random UUID");
+
+	u.uuid[6] = (u.uuid[6] & 0x0f) | 0x40;
+	u.uuid[8] = (u.uuid[8] & 0x3f) | 0x80;
+	return u;
+}
+
+bool UUID::operator==(const UUID & other) const
+{
+	return std::equal(std::begin(uuid), std::end(uuid), std::begin(other.uuid));
+}
+
+bool UUID::operator!=(const UUID & other) const
+{
+	return !(*this == other);
+}