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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics.CodeAnalysis;
namespace System.Xml
{
public class UniqueId
{
private long _idLow;
private long _idHigh;
private string? _s;
private const int guidLength = 16;
private const int uuidLength = 45;
private static ReadOnlySpan<short> Char2val =>
[
/* 0-15 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 16-31 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 32-47 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 48-63 */
0x000, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080, 0x090, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 64-79 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 80-95 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 96-111 */
0x100, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 112-127 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 0-15 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 16-31 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 32-47 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 48-63 */
0x000, 0x001, 0x002, 0x003, 0x004, 0x005, 0x006, 0x007, 0x008, 0x009, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 64-79 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 80-95 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 96-111 */
0x100, 0x00A, 0x00B, 0x00C, 0x00D, 0x00E, 0x00F, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
/* 112-127 */
0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100, 0x100,
];
public UniqueId() : this(Guid.NewGuid())
{
}
public UniqueId(Guid guid) : this(guid.ToByteArray())
{
}
public UniqueId(byte[] guid) : this(guid, 0)
{
}
public unsafe UniqueId(byte[] guid, int offset)
{
ArgumentNullException.ThrowIfNull(guid);
ArgumentOutOfRangeException.ThrowIfNegative(offset);
if (offset > guid.Length)
throw new ArgumentOutOfRangeException(nameof(offset), SR.Format(SR.OffsetExceedsBufferSize, guid.Length));
if (guidLength > guid.Length - offset)
throw new ArgumentException(SR.Format(SR.XmlArrayTooSmallInput, guidLength), nameof(guid));
fixed (byte* pb = &guid[offset])
{
_idLow = UnsafeGetInt64(pb);
_idHigh = UnsafeGetInt64(&pb[8]);
}
}
public unsafe UniqueId(string value)
{
ArgumentNullException.ThrowIfNull(value);
if (value.Length == 0)
throw new FormatException(SR.XmlInvalidUniqueId);
fixed (char* pch = value)
{
UnsafeParse(pch, value.Length);
}
_s = value;
}
public unsafe UniqueId(char[] chars, int offset, int count)
{
ArgumentNullException.ThrowIfNull(chars);
ArgumentOutOfRangeException.ThrowIfNegative(offset);
if (offset > chars.Length)
throw new ArgumentOutOfRangeException(nameof(offset), SR.Format(SR.OffsetExceedsBufferSize, chars.Length));
ArgumentOutOfRangeException.ThrowIfNegative(count);
if (count > chars.Length - offset)
throw new ArgumentOutOfRangeException(nameof(count), SR.Format(SR.SizeExceedsRemainingBufferSpace, chars.Length - offset));
if (count == 0)
throw new FormatException(SR.XmlInvalidUniqueId);
fixed (char* pch = &chars[offset])
{
UnsafeParse(pch, count);
}
if (!IsGuid)
{
_s = new string(chars, offset, count);
}
}
public int CharArrayLength
{
get
{
if (_s != null)
return _s.Length;
return uuidLength;
}
}
private unsafe int UnsafeDecode(short* char2val, char ch1, char ch2)
{
if ((ch1 | ch2) >= 0x80)
return 0x100;
return char2val[ch1] | char2val[0x80 + ch2];
}
private static unsafe void UnsafeEncode(byte b, char* pch)
{
pch[0] = HexConverter.ToCharLower(b >> 4);
pch[1] = HexConverter.ToCharLower(b);
}
public bool IsGuid => ((_idLow | _idHigh) != 0);
private unsafe void UnsafeParse(char* chars, int charCount)
{
// 1 2 3 4
// 012345678901234567890123456789012345678901234
// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
if (charCount != uuidLength ||
chars[0] != 'u' || chars[1] != 'r' || chars[2] != 'n' || chars[3] != ':' ||
chars[4] != 'u' || chars[5] != 'u' || chars[6] != 'i' || chars[7] != 'd' || chars[8] != ':' ||
chars[17] != '-' || chars[22] != '-' || chars[27] != '-' || chars[32] != '-')
{
return;
}
byte* bytes = stackalloc byte[guidLength];
int i = 0;
int j = 0;
fixed (short* ps = &Char2val[0])
{
short* _char2val = ps;
// 0 1 2 3 4
// 012345678901234567890123456789012345678901234
// urn:uuid:aabbccdd-eeff-gghh-0011-223344556677
//
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
// ddccbbaaffeehhgg0011223344556677
i = UnsafeDecode(_char2val, chars[15], chars[16]); bytes[0] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[13], chars[14]); bytes[1] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[11], chars[12]); bytes[2] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[9], chars[10]); bytes[3] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[20], chars[21]); bytes[4] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[18], chars[19]); bytes[5] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[25], chars[26]); bytes[6] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[23], chars[24]); bytes[7] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[28], chars[29]); bytes[8] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[30], chars[31]); bytes[9] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[33], chars[34]); bytes[10] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[35], chars[36]); bytes[11] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[37], chars[38]); bytes[12] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[39], chars[40]); bytes[13] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[41], chars[42]); bytes[14] = (byte)i; j |= i;
i = UnsafeDecode(_char2val, chars[43], chars[44]); bytes[15] = (byte)i; j |= i;
if (j >= 0x100)
return;
_idLow = UnsafeGetInt64(bytes);
_idHigh = UnsafeGetInt64(&bytes[8]);
}
}
public int ToCharArray(char[] chars, int offset)
{
ArgumentNullException.ThrowIfNull(chars);
int count = CharArrayLength;
ArgumentOutOfRangeException.ThrowIfNegative(offset);
if (offset > chars.Length)
throw new ArgumentOutOfRangeException(nameof(offset), SR.Format(SR.OffsetExceedsBufferSize, chars.Length));
if (count > chars.Length - offset)
throw new ArgumentOutOfRangeException(nameof(chars), SR.Format(SR.XmlArrayTooSmallOutput, count));
ToSpan(chars.AsSpan(offset, count));
return count;
}
private unsafe void ToSpan(Span<char> chars)
{
if (_s != null)
{
_s.CopyTo(chars);
}
else
{
byte* bytes = stackalloc byte[guidLength];
UnsafeSetInt64(_idLow, bytes);
UnsafeSetInt64(_idHigh, &bytes[8]);
fixed (char* _pch = &chars[0])
{
char* pch = _pch;
pch[0] = 'u';
pch[1] = 'r';
pch[2] = 'n';
pch[3] = ':';
pch[4] = 'u';
pch[5] = 'u';
pch[6] = 'i';
pch[7] = 'd';
pch[8] = ':';
pch[17] = '-';
pch[22] = '-';
pch[27] = '-';
pch[32] = '-';
UnsafeEncode(bytes[0], &pch[15]);
UnsafeEncode(bytes[1], &pch[13]);
UnsafeEncode(bytes[2], &pch[11]);
UnsafeEncode(bytes[3], &pch[9]);
UnsafeEncode(bytes[4], &pch[20]);
UnsafeEncode(bytes[5], &pch[18]);
UnsafeEncode(bytes[6], &pch[25]);
UnsafeEncode(bytes[7], &pch[23]);
UnsafeEncode(bytes[8], &pch[28]);
UnsafeEncode(bytes[9], &pch[30]);
UnsafeEncode(bytes[10], &pch[33]);
UnsafeEncode(bytes[11], &pch[35]);
UnsafeEncode(bytes[12], &pch[37]);
UnsafeEncode(bytes[13], &pch[39]);
UnsafeEncode(bytes[14], &pch[41]);
UnsafeEncode(bytes[15], &pch[43]);
}
}
}
public bool TryGetGuid(out Guid guid)
{
byte[] buffer = new byte[guidLength];
if (!TryGetGuid(buffer, 0))
{
guid = Guid.Empty;
return false;
}
guid = new Guid(buffer);
return true;
}
public unsafe bool TryGetGuid(byte[] buffer, int offset)
{
if (!IsGuid)
return false;
ArgumentNullException.ThrowIfNull(buffer);
ArgumentOutOfRangeException.ThrowIfNegative(offset);
if (offset > buffer.Length)
throw new ArgumentOutOfRangeException(nameof(offset), SR.Format(SR.OffsetExceedsBufferSize, buffer.Length));
if (guidLength > buffer.Length - offset)
throw new ArgumentOutOfRangeException(nameof(buffer), SR.Format(SR.XmlArrayTooSmallOutput, guidLength));
fixed (byte* pb = &buffer[offset])
{
UnsafeSetInt64(_idLow, pb);
UnsafeSetInt64(_idHigh, &pb[8]);
}
return true;
}
public override string ToString() =>
_s ??= string.Create(CharArrayLength, this, (destination, thisRef) => thisRef.ToSpan(destination));
public static bool operator ==(UniqueId? id1, UniqueId? id2)
{
if (object.ReferenceEquals(id1, id2))
return true;
if (id1 is null || id2 is null)
return false;
if (id1.IsGuid && id2.IsGuid)
{
return id1._idLow == id2._idLow && id1._idHigh == id2._idHigh;
}
return id1.ToString() == id2.ToString();
}
public static bool operator !=(UniqueId? id1, UniqueId? id2)
{
return !(id1 == id2);
}
public override bool Equals([NotNullWhen(true)] object? obj)
{
return this == (obj as UniqueId);
}
public override int GetHashCode()
{
if (IsGuid)
{
long hash = (_idLow ^ _idHigh);
return ((int)(hash >> 32)) ^ ((int)hash);
}
else
{
return ToString().GetHashCode();
}
}
private unsafe long UnsafeGetInt64(byte* pb)
{
int idLow = UnsafeGetInt32(pb);
int idHigh = UnsafeGetInt32(&pb[4]);
return (((long)idHigh) << 32) | ((uint)idLow);
}
private unsafe int UnsafeGetInt32(byte* pb)
{
int value = pb[3];
value <<= 8;
value |= pb[2];
value <<= 8;
value |= pb[1];
value <<= 8;
value |= pb[0];
return value;
}
private unsafe void UnsafeSetInt64(long value, byte* pb)
{
UnsafeSetInt32((int)value, pb);
UnsafeSetInt32((int)(value >> 32), &pb[4]);
}
private unsafe void UnsafeSetInt32(int value, byte* pb)
{
pb[0] = (byte)value;
value >>= 8;
pb[1] = (byte)value;
value >>= 8;
pb[2] = (byte)value;
value >>= 8;
pb[3] = (byte)value;
}
}
}
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