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/******************************************************************************
*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*
******************************************************************************/
#include "uuid.h"
#include <base/rand_util.h>
#include <base/strings/stringprintf.h>
#include <string.h>
#include <algorithm>
namespace bluetooth {
static_assert(sizeof(Uuid) == 16, "Uuid must be 16 bytes long!");
using UUID128Bit = Uuid::UUID128Bit;
const Uuid Uuid::kEmpty = Uuid::From128BitBE(UUID128Bit{{0x00}});
namespace {
constexpr Uuid kBase = Uuid::From128BitBE(
UUID128Bit{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00,
0x00, 0x80, 0x5f, 0x9b, 0x34, 0xfb}});
} // namespace
size_t Uuid::GetShortestRepresentationSize() const {
if (memcmp(uu.data() + kNumBytes32, kBase.uu.data() + kNumBytes32,
kNumBytes128 - kNumBytes32) != 0) {
return kNumBytes128;
}
if (uu[0] == 0 && uu[1] == 0) return kNumBytes16;
return kNumBytes32;
}
bool Uuid::Is16Bit() const {
return GetShortestRepresentationSize() == kNumBytes16;
}
uint16_t Uuid::As16Bit() const { return (((uint16_t)uu[2]) << 8) + uu[3]; }
uint32_t Uuid::As32Bit() const {
return (((uint32_t)uu[0]) << 24) + (((uint32_t)uu[1]) << 16) +
(((uint32_t)uu[2]) << 8) + uu[3];
}
Uuid Uuid::FromString(const std::string& uuid, bool* is_valid) {
if (is_valid) *is_valid = false;
Uuid ret = kBase;
if (uuid.empty()) return ret;
uint8_t* p = ret.uu.data();
if (uuid.size() == kString128BitLen) {
if (uuid[8] != '-' || uuid[13] != '-' || uuid[18] != '-' ||
uuid[23] != '-') {
return ret;
}
int c;
int rc =
sscanf(uuid.c_str(),
"%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx"
"-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%n",
&p[0], &p[1], &p[2], &p[3], &p[4], &p[5], &p[6], &p[7], &p[8],
&p[9], &p[10], &p[11], &p[12], &p[13], &p[14], &p[15], &c);
if (rc != 16) return ret;
if (c != kString128BitLen) return ret;
if (is_valid) *is_valid = true;
} else if (uuid.size() == 8) {
int c;
int rc = sscanf(uuid.c_str(), "%02hhx%02hhx%02hhx%02hhx%n", &p[0], &p[1],
&p[2], &p[3], &c);
if (rc != 4) return ret;
if (c != 8) return ret;
if (is_valid) *is_valid = true;
} else if (uuid.size() == 4) {
int c;
int rc = sscanf(uuid.c_str(), "%02hhx%02hhx%n", &p[2], &p[3], &c);
if (rc != 2) return ret;
if (c != 4) return ret;
if (is_valid) *is_valid = true;
}
return ret;
}
Uuid Uuid::From16Bit(uint16_t uuid16) {
Uuid u = kBase;
u.uu[2] = (uint8_t)((0xFF00 & uuid16) >> 8);
u.uu[3] = (uint8_t)(0x00FF & uuid16);
return u;
}
Uuid Uuid::From32Bit(uint32_t uuid32) {
Uuid u = kBase;
u.uu[0] = (uint8_t)((0xFF000000 & uuid32) >> 24);
u.uu[1] = (uint8_t)((0x00FF0000 & uuid32) >> 16);
u.uu[2] = (uint8_t)((0x0000FF00 & uuid32) >> 8);
u.uu[3] = (uint8_t)(0x000000FF & uuid32);
return u;
}
Uuid Uuid::From128BitBE(const uint8_t* uuid) {
UUID128Bit tmp;
memcpy(tmp.data(), uuid, kNumBytes128);
return From128BitBE(tmp);
}
Uuid Uuid::From128BitLE(const UUID128Bit& uuid) {
Uuid u;
std::reverse_copy(uuid.data(), uuid.data() + kNumBytes128, u.uu.begin());
return u;
}
Uuid Uuid::From128BitLE(const uint8_t* uuid) {
UUID128Bit tmp;
memcpy(tmp.data(), uuid, kNumBytes128);
return From128BitLE(tmp);
}
const UUID128Bit Uuid::To128BitLE() const {
UUID128Bit le;
std::reverse_copy(uu.data(), uu.data() + kNumBytes128, le.begin());
return le;
}
const UUID128Bit& Uuid::To128BitBE() const { return uu; }
Uuid Uuid::GetRandom() {
Uuid uuid;
base::RandBytes(uuid.uu.data(), uuid.uu.size());
return uuid;
}
bool Uuid::IsEmpty() const { return *this == kEmpty; }
void Uuid::UpdateUuid(const Uuid& uuid) {
uu = uuid.uu;
}
bool Uuid::operator<(const Uuid& rhs) const {
return std::lexicographical_compare(uu.begin(), uu.end(), rhs.uu.begin(),
rhs.uu.end());
}
bool Uuid::operator==(const Uuid& rhs) const { return uu == rhs.uu; }
bool Uuid::operator!=(const Uuid& rhs) const { return uu != rhs.uu; }
std::string Uuid::ToString() const {
return base::StringPrintf(
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7], uu[8], uu[9],
uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
}
} // namespace bluetooth
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