Add UUID, strlcpy, and their tests to util

util/misc/uuid.h

Index: util/misc/uuid.h
diff --git a/util/misc/uuid.h b/util/misc/uuid.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_MISC_UUID_H_
+#define CRASHPAD_UTIL_MISC_UUID_H_
+
+#include <stdint.h>
+
+#include <string>
+
+namespace crashpad {
+
+//! \brief A universally unique identifier (%UUID).
+//!
+//! An alternate term for %UUID is “globally unique identifier” (GUID), used
+//! primarily by Microsoft.
+//!
+//! A %UUID is a unique 128-bit number specified by RFC 4122.
+//!
+//! This is a standard-layout structure, and it is acceptable to use `memcpy()`
+//! to set its value.
+struct UUID {
+  //! \brief Initializes the %UUID to zero.
+  UUID();
+
+  //! \brief Initializes the %UUID from a sequence of bytes.
+  //!
+  //! \param[in] bytes A buffer of exactly 16 bytes that will be assigned to the
+  //!     %UUID.
+  explicit UUID(const uint8_t* bytes);
+
+  //! \brief Formats the %UUID per RFC 4122 §3.
+  //!
+  //! \return A string of the form `"00112233-4455-6677-8899-aabbccddeeff"`.
+  std::string ToString() const;
+
+  uint8_t data[16];
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_MISC_UUID_H_