mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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112 lines
4.7 KiB
C++
112 lines
4.7 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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namespace ams::util {
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namespace {
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struct UuidImpl {
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util::BitPack32 data[4];
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using TimeLow = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
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using TimeMid = util::BitPack32::Field<0, BITSIZEOF(u16), u16>;
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using TimeHighAndVersion = util::BitPack32::Field<TimeMid::Next, BITSIZEOF(u16), u16>;
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using Version = util::BitPack32::Field<TimeMid::Next + 12, 4, u16>;
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static_assert(TimeHighAndVersion::Next == Version::Next);
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using ClockSeqHiAndReserved = util::BitPack32::Field<0, BITSIZEOF(u8), u8>;
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using Reserved = util::BitPack32::Field<6, 2, u8>;
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using ClockSeqLow = util::BitPack32::Field<ClockSeqHiAndReserved::Next, BITSIZEOF(u8), u8>;
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using NodeLow = util::BitPack32::Field<ClockSeqLow::Next, BITSIZEOF(u16), u16>;
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static_assert(ClockSeqHiAndReserved::Next == Reserved::Next);
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using NodeHigh = util::BitPack32::Field<0, BITSIZEOF(u32), u32>;
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inline Uuid Convert() const {
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/* Convert the fields from native endian to big endian. */
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util::BitPack32 converted[4] = {util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}};
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converted[0].Set<TimeLow>(util::ConvertToBigEndian(this->data[0].Get<TimeLow>()));
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converted[1].Set<TimeMid>(util::ConvertToBigEndian(this->data[1].Get<TimeMid>()));
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converted[1].Set<TimeHighAndVersion>(util::ConvertToBigEndian(this->data[1].Get<TimeHighAndVersion>()));
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converted[2].Set<ClockSeqHiAndReserved>(util::ConvertToBigEndian(this->data[2].Get<ClockSeqHiAndReserved>()));
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converted[2].Set<ClockSeqLow>(util::ConvertToBigEndian(this->data[2].Get<ClockSeqLow>()));
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u64 node_lo = static_cast<u64>(this->data[2].Get<NodeLow>());
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u64 node_hi = static_cast<u64>(this->data[3].Get<NodeHigh>());
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u64 node = util::ConvertToBigEndian48(static_cast<u64>((node_hi << BITSIZEOF(u16)) | (node_lo)));
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constexpr u64 NodeLoMask = (UINT64_C(1) << BITSIZEOF(u16)) - 1u;
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constexpr u64 NodeHiMask = (UINT64_C(1) << BITSIZEOF(u32)) - 1u;
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converted[2].Set<NodeLow>(static_cast<u16>(node & NodeLoMask));
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converted[3].Set<NodeHigh>(static_cast<u32>((node >> BITSIZEOF(u16)) & NodeHiMask));
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Uuid uuid;
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std::memcpy(uuid.data, converted, sizeof(uuid.data));
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return uuid;
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}
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};
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static_assert(sizeof(UuidImpl) == sizeof(Uuid));
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ALWAYS_INLINE Uuid GenerateUuidVersion4() {
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constexpr u16 Version = 0x4;
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constexpr u8 Reserved = 0x1;
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/* Generate a random uuid. */
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UuidImpl uuid = {util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}};
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os::GenerateRandomBytes(uuid.data, sizeof(uuid.data));
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/* Set version and reserved. */
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uuid.data[1].Set<UuidImpl::Version>(Version);
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uuid.data[2].Set<UuidImpl::Reserved>(Reserved);
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/* Return the uuid. */
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return uuid.Convert();
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}
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}
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Uuid GenerateUuid() {
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return GenerateUuidVersion4();
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}
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Uuid GenerateUuidVersion5(const void *sha1_hash) {
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constexpr u16 Version = 0x5;
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constexpr u8 Reserved = 0x1;
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/* Generate a uuid from a SHA1 hash. */
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UuidImpl uuid = {util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}, util::BitPack32{0}};
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std::memcpy(uuid.data, sha1_hash, sizeof(uuid.data));
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/* Set version and reserved. */
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uuid.data[1].Set<UuidImpl::Version>(Version);
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uuid.data[2].Set<UuidImpl::Reserved>(Reserved);
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/* Return the uuid. */
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return uuid.Convert();
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}
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}
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