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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/guid.h"
- #include <stddef.h>
- #include <stdint.h>
- #include <ostream>
- #include "base/rand_util.h"
- #include "base/strings/string_util.h"
- #include "base/strings/stringprintf.h"
- namespace base {
- namespace {
- template <typename Char>
- constexpr bool IsLowerHexDigit(Char c) {
- return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f');
- }
- constexpr bool IsHyphenPosition(size_t i) {
- return i == 8 || i == 13 || i == 18 || i == 23;
- }
- // Returns a canonical GUID string given that `input` is validly formatted
- // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, such that x is a hexadecimal digit.
- // If `strict`, x must be a lower-case hexadecimal digit.
- template <typename StringPieceType>
- std::string GetCanonicalGUIDInternal(StringPieceType input, bool strict) {
- using CharType = typename StringPieceType::value_type;
- constexpr size_t kGUIDLength = 36;
- if (input.length() != kGUIDLength)
- return std::string();
- std::string lowercase_;
- lowercase_.resize(kGUIDLength);
- for (size_t i = 0; i < input.length(); ++i) {
- CharType current = input[i];
- if (IsHyphenPosition(i)) {
- if (current != '-')
- return std::string();
- lowercase_[i] = '-';
- } else {
- if (strict ? !IsLowerHexDigit(current) : !IsHexDigit(current))
- return std::string();
- lowercase_[i] = static_cast<char>(ToLowerASCII(current));
- }
- }
- return lowercase_;
- }
- } // namespace
- std::string GenerateGUID() {
- GUID guid = GUID::GenerateRandomV4();
- return guid.AsLowercaseString();
- }
- bool IsValidGUID(StringPiece input) {
- return !GetCanonicalGUIDInternal(input, /*strict=*/false).empty();
- }
- bool IsValidGUID(StringPiece16 input) {
- return !GetCanonicalGUIDInternal(input, /*strict=*/false).empty();
- }
- bool IsValidGUIDOutputString(StringPiece input) {
- return !GetCanonicalGUIDInternal(input, /*strict=*/true).empty();
- }
- std::string RandomDataToGUIDString(const uint64_t bytes[2]) {
- return StringPrintf(
- "%08x-%04x-%04x-%04x-%012llx", static_cast<uint32_t>(bytes[0] >> 32),
- static_cast<uint32_t>((bytes[0] >> 16) & 0x0000ffff),
- static_cast<uint32_t>(bytes[0] & 0x0000ffff),
- static_cast<uint32_t>(bytes[1] >> 48), bytes[1] & 0x0000ffff'ffffffffULL);
- }
- // static
- GUID GUID::GenerateRandomV4() {
- uint64_t sixteen_bytes[2];
- // Use base::RandBytes instead of crypto::RandBytes, because crypto calls the
- // base version directly, and to prevent the dependency from base/ to crypto/.
- RandBytes(&sixteen_bytes, sizeof(sixteen_bytes));
- // Set the GUID to version 4 as described in RFC 4122, section 4.4.
- // The format of GUID version 4 must be xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx,
- // where y is one of [8, 9, a, b].
- // Clear the version bits and set the version to 4:
- sixteen_bytes[0] &= 0xffffffff'ffff0fffULL;
- sixteen_bytes[0] |= 0x00000000'00004000ULL;
- // Set the two most significant bits (bits 6 and 7) of the
- // clock_seq_hi_and_reserved to zero and one, respectively:
- sixteen_bytes[1] &= 0x3fffffff'ffffffffULL;
- sixteen_bytes[1] |= 0x80000000'00000000ULL;
- GUID guid;
- guid.lowercase_ = RandomDataToGUIDString(sixteen_bytes);
- return guid;
- }
- // static
- GUID GUID::ParseCaseInsensitive(StringPiece input) {
- GUID guid;
- guid.lowercase_ = GetCanonicalGUIDInternal(input, /*strict=*/false);
- return guid;
- }
- // static
- GUID GUID::ParseCaseInsensitive(StringPiece16 input) {
- GUID guid;
- guid.lowercase_ = GetCanonicalGUIDInternal(input, /*strict=*/false);
- return guid;
- }
- // static
- GUID GUID::ParseLowercase(StringPiece input) {
- GUID guid;
- guid.lowercase_ = GetCanonicalGUIDInternal(input, /*strict=*/true);
- return guid;
- }
- // static
- GUID GUID::ParseLowercase(StringPiece16 input) {
- GUID guid;
- guid.lowercase_ = GetCanonicalGUIDInternal(input, /*strict=*/true);
- return guid;
- }
- GUID::GUID() = default;
- GUID::GUID(const GUID& other) = default;
- GUID& GUID::operator=(const GUID& other) = default;
- GUID::GUID(GUID&& other) = default;
- GUID& GUID::operator=(GUID&& other) = default;
- const std::string& GUID::AsLowercaseString() const {
- return lowercase_;
- }
- bool GUID::operator==(const GUID& other) const {
- return AsLowercaseString() == other.AsLowercaseString();
- }
- bool GUID::operator!=(const GUID& other) const {
- return !(*this == other);
- }
- bool GUID::operator<(const GUID& other) const {
- return AsLowercaseString() < other.AsLowercaseString();
- }
- bool GUID::operator<=(const GUID& other) const {
- return *this < other || *this == other;
- }
- bool GUID::operator>(const GUID& other) const {
- return !(*this <= other);
- }
- bool GUID::operator>=(const GUID& other) const {
- return !(*this < other);
- }
- std::ostream& operator<<(std::ostream& out, const GUID& guid) {
- return out << guid.AsLowercaseString();
- }
- } // namespace base
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