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linux-packaging-mono/mcs/class/referencesource/System.Runtime.Serialization/System/Xml/UniqueID.cs
Xamarin Public Jenkins (auto-signing) 536cd135cc Imported Upstream version 5.4.0.167 
Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa
2017-08-21 15:34:15 +00:00

432 lines
20 KiB
C#
Raw Blame History

//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.Xml
{
using System.Runtime;
using System.Runtime.Serialization; // for SR
using System.Security;
public class UniqueId
{
Int64 idLow;
Int64 idHigh;
[Fx.Tag.SecurityNote(Critical = "Some SecurityCritical unsafe code assumes that this field has been validated.")]
[SecurityCritical]
string s;
const int guidLength = 16;
const int uuidLength = 45;
static short[] char2val = new short[256]
{
/* 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,
};
const string val2char = "0123456789abcdef";
public UniqueId() : this(Guid.NewGuid())
{
}
public UniqueId(Guid guid) : this(guid.ToByteArray())
{
}
public UniqueId(byte[] guid) : this(guid, 0)
{
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code.",
Safe = "Unsafe code is effectively encapsulated, all inputs are validated.")]
[SecuritySafeCritical]
unsafe public UniqueId(byte[] guid, int offset)
{
if (guid == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("guid"));
if (offset < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.ValueMustBeNonNegative)));
if (offset > guid.Length)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.OffsetExceedsBufferSize, guid.Length)));
if (guidLength > guid.Length - offset)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlArrayTooSmallInput, guidLength), "guid"));
fixed (byte* pb = &guid[offset])
{
this.idLow = UnsafeGetInt64(pb);
this.idHigh = UnsafeGetInt64(&pb[8]);
}
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code.",
Safe = "Unsafe code is effectively encapsulated, all inputs are validated.")]
[SecuritySafeCritical]
unsafe public UniqueId(string value)
{
if (value == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("value");
if (value.Length == 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.GetString(SR.XmlInvalidUniqueId)));
fixed (char* pch = value)
{
UnsafeParse(pch, value.Length);
}
this.s = value;
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code.",
Safe = "Unsafe code is effectively encapsulated, all inputs are validated.")]
[SecuritySafeCritical]
unsafe public UniqueId(char[] chars, int offset, int count)
{
if (chars == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("chars"));
if (offset < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.ValueMustBeNonNegative)));
if (offset > chars.Length)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.OffsetExceedsBufferSize, chars.Length)));
if (count < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("count", SR.GetString(SR.ValueMustBeNonNegative)));
if (count > chars.Length - offset)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("count", SR.GetString(SR.SizeExceedsRemainingBufferSpace, chars.Length - offset)));
if (count == 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.GetString(SR.XmlInvalidUniqueId)));
fixed (char* pch = &chars[offset])
{
UnsafeParse(pch, count);
}
if (!IsGuid)
{
this.s = new string(chars, offset, count);
}
}
public int CharArrayLength
{
[Fx.Tag.SecurityNote(Critical = "Accesses critical field 's'.",
Safe = "Doesn't leak any control or data.")]
[SecuritySafeCritical]
get
{
if (s != null)
return s.Length;
return uuidLength;
}
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
unsafe int UnsafeDecode(short* char2val, char ch1, char ch2)
{
if ((ch1 | ch2) >= 0x80)
return 0x100;
return char2val[ch1] | char2val[0x80 + ch2];
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
unsafe void UnsafeEncode(char* val2char, byte b, char* pch)
{
pch[0] = val2char[b >> 4];
pch[1] = val2char[b & 0x0F];
}
public bool IsGuid
{
get
{
return ((idLow | idHigh) != 0);
}
}
// It must be the case that comparing UniqueId's as strings yields the same result as comparing UniqueId's as
// their binary equivalent. This means that there must be a 1-1 relationship between a string and its binary
// equivalent. Therefore, for example, we cannot accept both upper and lower case hex chars since there would
// then be more than 1 string that mapped to a binary equivalent.
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
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)
{
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;
this.idLow = UnsafeGetInt64(bytes);
this.idHigh = UnsafeGetInt64(&bytes[8]);
}
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code.",
Safe = "Unsafe code is effectively encapsulated, all inputs are validated.")]
[SecuritySafeCritical]
unsafe public int ToCharArray(char[] chars, int offset)
{
int count = CharArrayLength;
if (chars == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("chars"));
if (offset < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.ValueMustBeNonNegative)));
if (offset > chars.Length)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.OffsetExceedsBufferSize, chars.Length)));
if (count > chars.Length - offset)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("chars", SR.GetString(SR.XmlArrayTooSmallOutput, count)));
if (s != null)
{
s.CopyTo(0, chars, offset, count);
}
else
{
byte* bytes = stackalloc byte[guidLength];
UnsafeSetInt64(this.idLow, bytes);
UnsafeSetInt64(this.idHigh, &bytes[8]);
fixed (char* _pch = &chars[offset])
{
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] = '-';
fixed (char* ps = val2char)
{
char* _val2char = ps;
UnsafeEncode(_val2char, bytes[0], &pch[15]);
UnsafeEncode(_val2char, bytes[1], &pch[13]);
UnsafeEncode(_val2char, bytes[2], &pch[11]);
UnsafeEncode(_val2char, bytes[3], &pch[9]);
UnsafeEncode(_val2char, bytes[4], &pch[20]);
UnsafeEncode(_val2char, bytes[5], &pch[18]);
UnsafeEncode(_val2char, bytes[6], &pch[25]);
UnsafeEncode(_val2char, bytes[7], &pch[23]);
UnsafeEncode(_val2char, bytes[8], &pch[28]);
UnsafeEncode(_val2char, bytes[9], &pch[30]);
UnsafeEncode(_val2char, bytes[10], &pch[33]);
UnsafeEncode(_val2char, bytes[11], &pch[35]);
UnsafeEncode(_val2char, bytes[12], &pch[37]);
UnsafeEncode(_val2char, bytes[13], &pch[39]);
UnsafeEncode(_val2char, bytes[14], &pch[41]);
UnsafeEncode(_val2char, bytes[15], &pch[43]);
}
}
}
return count;
}
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;
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code.",
Safe = "Unsafe code is effectively encapsulated, all inputs are validated.")]
[SecuritySafeCritical]
unsafe public bool TryGetGuid(byte[] buffer, int offset)
{
if (!IsGuid)
return false;
if (buffer == null)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("buffer"));
if (offset < 0)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.ValueMustBeNonNegative)));
if (offset > buffer.Length)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("offset", SR.GetString(SR.OffsetExceedsBufferSize, buffer.Length)));
if (guidLength > buffer.Length - offset)
throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("buffer", SR.GetString(SR.XmlArrayTooSmallOutput, guidLength)));
fixed (byte* pb = &buffer[offset])
{
UnsafeSetInt64(this.idLow, pb);
UnsafeSetInt64(this.idHigh, &pb[8]);
}
return true;
}
[Fx.Tag.SecurityNote(Critical = "Accesses critical field 's'.",
Safe = "Doesn't allow unchecked write access to the field.")]
[SecuritySafeCritical]
unsafe public override string ToString()
{
if (s == null)
{
int length = CharArrayLength;
char[] chars = new char[length];
ToCharArray(chars, 0);
s = new string(chars, 0, length);
}
return s;
}
static public bool operator ==(UniqueId id1, UniqueId id2)
{
if (object.ReferenceEquals(id1, null) && object.ReferenceEquals(id2, null))
return true;
if (object.ReferenceEquals(id1, null) || object.ReferenceEquals(id2, null))
return false;
#pragma warning suppress 56506 // Microsoft, checks for whether id1 and id2 are null done above.
if (id1.IsGuid && id2.IsGuid)
{
return id1.idLow == id2.idLow && id1.idHigh == id2.idHigh;
}
return id1.ToString() == id2.ToString();
}
static public bool operator !=(UniqueId id1, UniqueId id2)
{
return !(id1 == id2);
}
public override bool Equals(object obj)
{
return this == (obj as UniqueId);
}
public override int GetHashCode()
{
if (IsGuid)
{
Int64 hash = (idLow ^ idHigh);
return ((int)(hash >> 32)) ^ ((int)hash);
}
else
{
return ToString().GetHashCode();
}
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
unsafe Int64 UnsafeGetInt64(byte* pb)
{
Int32 idLow = UnsafeGetInt32(pb);
Int32 idHigh = UnsafeGetInt32(&pb[4]);
return (((Int64)idHigh) << 32) | ((UInt32)idLow);
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
unsafe Int32 UnsafeGetInt32(byte* pb)
{
int value = pb[3];
value <<= 8;
value |= pb[2];
value <<= 8;
value |= pb[1];
value <<= 8;
value |= pb[0];
return value;
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
unsafe void UnsafeSetInt64(Int64 value, byte* pb)
{
UnsafeSetInt32((int)value, pb);
UnsafeSetInt32((int)(value >> 32), &pb[4]);
}
[Fx.Tag.SecurityNote(Critical = "Contains unsafe code. Caller needs to validate arguments.")]
[SecurityCritical]
unsafe void UnsafeSetInt32(Int32 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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