Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Guid.cs / 1 / Guid.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System {
using System;
using System.Globalization;
using System.Text;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
// Represents a Globally Unique Identifier.
[StructLayout(LayoutKind.Sequential)]
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public struct Guid : IFormattable, IComparable
#if GENERICS_WORK
, IComparable, IEquatable
#endif
{
public static readonly Guid Empty = new Guid();
////////////////////////////////////////////////////////////////////////////////
// Member variables
////////////////////////////////////////////////////////////////////////////////
private int _a;
private short _b;
private short _c;
private byte _d;
private byte _e;
private byte _f;
private byte _g;
private byte _h;
private byte _i;
private byte _j;
private byte _k;
////////////////////////////////////////////////////////////////////////////////
// Constructors
////////////////////////////////////////////////////////////////////////////////
// Creates a new guid from an array of bytes.
//
public Guid(byte[] b)
{
if (b==null)
throw new ArgumentNullException("b");
if (b.Length != 16)
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_GuidArrayCtor"), "16"));
_a = ((int)b[3] << 24) | ((int)b[2] << 16) | ((int)b[1] << 8) | b[0];
_b = (short)(((int)b[5] << 8) | b[4]);
_c = (short)(((int)b[7] << 8) | b[6]);
_d = b[8];
_e = b[9];
_f = b[10];
_g = b[11];
_h = b[12];
_i = b[13];
_j = b[14];
_k = b[15];
}
[CLSCompliant(false)]
public Guid (uint a, ushort b, ushort c, byte d, byte e, byte f, byte g, byte h, byte i, byte j, byte k)
{
_a = (int)a;
_b = (short)b;
_c = (short)c;
_d = d;
_e = e;
_f = f;
_g = g;
_h = h;
_i = i;
_j = j;
_k = k;
}
// Creates a new guid with all contents having value of 0
private Guid(bool blank)
{
// Must initialize value class members even if the native
// function reinitializes them. Compiler appeasement.
_a = 0;
_b = 0;
_c = 0;
_d = 0;
_e = 0;
_f = 0;
_g = 0;
_h = 0;
_i = 0;
_j = 0;
_k = 0;
if (!blank)
CompleteGuid();
}
// Creates a new guid based on the value in the string. The value is made up
// of hex digits speared by the dash ("-"). The string may begin and end with
// brackets ("{", "}").
//
// The string must be of the form dddddddd-dddd-dddd-dddd-dddddddddddd. where
// d is a hex digit. (That is 8 hex digits, followed by 4, then 4, then 4,
// then 12) such as: "CA761232-ED42-11CE-BACD-00AA0057B223"
//
public Guid(String g)
{
if (g==null) {
throw new ArgumentNullException("g");
}
int startPos=0;
int temp;
long templ;
int currentPos = 0 ;
try
{
// Check if it's of the form dddddddd-dddd-dddd-dddd-dddddddddddd
if(g.IndexOf('-', 0) >= 0)
{
String guidString = g.Trim(); //Remove Whitespace
// check to see that it's the proper length
if (guidString[0]=='{') {
if (guidString.Length!=38 || guidString[37]!='}') {
throw new FormatException(Environment.GetResourceString("Format_GuidInvLen"));
}
startPos=1;
}
else if (guidString[0]=='(')
{
if (guidString.Length!=38 || guidString[37]!=')')
{
throw new FormatException(Environment.GetResourceString("Format_GuidInvLen"));
}
startPos=1;
}
else if(guidString.Length != 36) {
throw new FormatException(Environment.GetResourceString("Format_GuidInvLen"));
}
if (guidString[8+startPos] != '-' ||
guidString[13+startPos] != '-' ||
guidString[18+startPos] != '-' ||
guidString[23+startPos] != '-') {
throw new FormatException(Environment.GetResourceString("Format_GuidDashes"));
}
currentPos = startPos;
_a = TryParse(guidString, ref currentPos,8);
++currentPos; //Increment past the '-';
_b = (short)TryParse(guidString, ref currentPos,4);
++currentPos; //Increment past the '-';
_c = (short)TryParse(guidString, ref currentPos,4);
++currentPos; //Increment past the '-';
temp=TryParse(guidString, ref currentPos,4);
++currentPos; //Increment past the '-';
startPos=currentPos;
templ = ParseNumbers.StringToLong(guidString, 16, ParseNumbers.NoSpace, ref currentPos);
if (currentPos - startPos != 12) {
throw new FormatException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Format_GuidInvLen")));
}
_d = (byte)(temp>>8);
_e = (byte)(temp);
temp = (int)(templ >> 32);
_f = (byte)(temp>>8);
_g = (byte)(temp);
temp = (int)(templ);
_h = (byte)(temp>>24);
_i = (byte)(temp>>16);
_j = (byte)(temp>>8);
_k = (byte)(temp);
}
// Else check if it is of the form
// {0xdddddddd,0xdddd,0xdddd,{0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd,0xdd}}
else if(g.IndexOf('{', 0) >= 0)
{
int numStart = 0;
int numLen = 0;
// Convert to lower case
//g = g.ToLower();
// Eat all of the whitespace
g = EatAllWhitespace(g);
// Check for leading '{'
if(g[0] != '{')
throw new FormatException(Environment.GetResourceString("Format_GuidBrace"));
// Check for '0x'
if(!IsHexPrefix(g, 1))
throw new FormatException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Format_GuidHexPrefix"), "{0xdddddddd, etc}"));
// Find the end of this hex number (since it is not fixed length)
numStart = 3;
numLen = g.IndexOf(',', numStart) - numStart;
if(numLen <= 0)
throw new FormatException(Environment.GetResourceString("Format_GuidComma"));
// Read in the number
_a = (int) ParseNumbers.StringToInt(g.Substring(numStart, numLen), // first DWORD
16, // hex
ParseNumbers.IsTight); // tight parsing
// Check for '0x'
if(!IsHexPrefix(g, numStart+numLen+1))
throw new FormatException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Format_GuidHexPrefix"), "{0xdddddddd, 0xdddd, etc}"));
// +3 to get by ',0x'
numStart = numStart + numLen + 3;
numLen = g.IndexOf(',', numStart) - numStart;
if(numLen <= 0)
throw new FormatException(Environment.GetResourceString("Format_GuidComma"));
// Read in the number
_b = (short) ParseNumbers.StringToInt(
g.Substring(numStart, numLen), // first DWORD
16, // hex
ParseNumbers.IsTight); // tight parsing
// Check for '0x'
if(!IsHexPrefix(g, numStart+numLen+1))
throw new FormatException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Format_GuidHexPrefix"), "{0xdddddddd, 0xdddd, 0xdddd, etc}"));
// +3 to get by ',0x'
numStart = numStart + numLen + 3;
numLen = g.IndexOf(',', numStart) - numStart;
if(numLen <= 0)
throw new FormatException(Environment.GetResourceString("Format_GuidComma"));
// Read in the number
_c = (short) ParseNumbers.StringToInt(
g.Substring(numStart, numLen), // first DWORD
16, // hex
ParseNumbers.IsTight); // tight parsing
// Check for '{'
if(g.Length <= numStart+numLen+1 || g[numStart+numLen+1] != '{')
throw new FormatException(Environment.GetResourceString("Format_GuidBrace"));
// Prepare for loop
numLen++;
byte[] bytes = new byte[8];
for(int i = 0; i < 8; i++)
{
// Check for '0x'
if(!IsHexPrefix(g, numStart+numLen+1))
throw new FormatException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Format_GuidHexPrefix"), "{... { ... 0xdd, ...}}"));
// +3 to get by ',0x' or '{0x' for first case
numStart = numStart + numLen + 3;
// Calculate number length
if(i < 7) // first 7 cases
{
numLen = g.IndexOf(',', numStart) - numStart;
if(numLen <= 0) {
throw new FormatException(Environment.GetResourceString("Format_GuidComma"));
}
}
else // last case ends with '}', not ','
{
numLen = g.IndexOf('}', numStart) - numStart;
if(numLen <= 0) {
throw new FormatException(Environment.GetResourceString("Format_GuidBraceAfterLastNumber"));
}
}
// Read in the number
uint number = (uint)Convert.ToInt32(g.Substring(numStart, numLen),16);
// check for overflow
if(number > 255) {
throw new FormatException(Environment.GetResourceString("Overflow_Byte"));
}
bytes[i] = (byte)number;
}
_d = bytes[0];
_e = bytes[1];
_f = bytes[2];
_g = bytes[3];
_h = bytes[4];
_i = bytes[5];
_j = bytes[6];
_k = bytes[7];
// Check for last '}'
if(numStart+numLen+1 >= g.Length || g[numStart+numLen+1] != '}') {
throw new FormatException(Environment.GetResourceString("Format_GuidEndBrace"));
}
// Check if we have extra characters at the end
if( numStart+numLen+1 != g.Length -1) {
throw new FormatException(Environment.GetResourceString("Format_ExtraJunkAtEnd"));
}
return;
}
else
// Check if it's of the form dddddddddddddddddddddddddddddddd
{
String guidString = g.Trim(); //Remove Whitespace
if(guidString.Length != 32) {
throw new FormatException(Environment.GetResourceString("Format_GuidInvLen"));
}
for(int i= 0; i< guidString.Length; i++) {
char ch = guidString[i];
if(ch >= '0' && ch <= '9') {
continue;
}
else {
char upperCaseCh = Char.ToUpper(ch, CultureInfo.InvariantCulture);
if(upperCaseCh >= 'A' && upperCaseCh <= 'F') {
continue;
}
}
throw new FormatException(Environment.GetResourceString("Format_GuidInvalidChar"));
}
_a = (int) ParseNumbers.StringToInt(guidString.Substring(startPos, 8), // first DWORD
16, // hex
ParseNumbers.IsTight); // tight parsing
startPos += 8;
_b = (short) ParseNumbers.StringToInt(guidString.Substring(startPos, 4),
16,
ParseNumbers.IsTight);
startPos += 4;
_c = (short) ParseNumbers.StringToInt(guidString.Substring(startPos, 4),
16,
ParseNumbers.IsTight);
startPos += 4;
temp=(short) ParseNumbers.StringToInt(guidString.Substring(startPos, 4),
16,
ParseNumbers.IsTight);
startPos += 4;
currentPos = startPos;
templ = ParseNumbers.StringToLong(guidString, 16, startPos, ref currentPos);
if (currentPos - startPos!=12) {
throw new FormatException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Format_GuidInvLen")));
}
_d = (byte)(temp>>8);
_e = (byte)(temp);
temp = (int)(templ >> 32);
_f = (byte)(temp>>8);
_g = (byte)(temp);
temp = (int)(templ);
_h = (byte)(temp>>24);
_i = (byte)(temp>>16);
_j = (byte)(temp>>8);
_k = (byte)(temp);
}
}
catch(IndexOutOfRangeException)
{
throw new FormatException(Environment.GetResourceString("Format_GuidUnrecognized"));
}
}
// Creates a new GUID initialized to the value represented by the arguments.
//
public Guid(int a, short b, short c, byte[] d)
{
if (d==null)
throw new ArgumentNullException("d");
// Check that array is not too big
if(d.Length != 8)
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_GuidArrayCtor"), "8"));
_a = a;
_b = b;
_c = c;
_d = d[0];
_e = d[1];
_f = d[2];
_g = d[3];
_h = d[4];
_i = d[5];
_j = d[6];
_k = d[7];
}
// Creates a new GUID initialized to the value represented by the
// arguments. The bytes are specified like this to avoid endianness issues.
//
public Guid(int a, short b, short c, byte d, byte e, byte f, byte g, byte h, byte i, byte j, byte k)
{
_a = a;
_b = b;
_c = c;
_d = d;
_e = e;
_f = f;
_g = g;
_h = h;
_i = i;
_j = j;
_k = k;
}
private static int TryParse(String str, ref int parsePos, int requiredLength) {
int currStart = parsePos;
// the exception message from ParseNumbers is better
int retVal = ParseNumbers.StringToInt(str, 16, ParseNumbers.NoSpace, ref parsePos);
//If we didn't parse enough characters, there's clearly an error.
if (parsePos - currStart != requiredLength) {
throw new FormatException(Environment.GetResourceString("Format_GuidInvalidChar"));
}
return retVal;
}
private static String EatAllWhitespace(String str)
{
int newLength = 0;
char[] chArr = new char[str.Length];
char curChar;
// Now get each char from str and if it is not whitespace add it to chArr
for(int i = 0; i < str.Length; i++)
{
curChar = str[i];
if(!Char.IsWhiteSpace(curChar))
{
chArr[newLength++] = curChar;
}
}
// Return a new string based on chArr
return new String(chArr, 0, newLength);
}
private static bool IsHexPrefix(String str, int i)
{
if(str[i] == '0' && (Char.ToLower(str[i+1], CultureInfo.InvariantCulture) == 'x'))
return true;
else
return false;
}
// Returns an unsigned byte array containing the GUID.
public byte[] ToByteArray()
{
byte[] g = new byte[16];
g[0] = (byte)(_a);
g[1] = (byte)(_a >> 8);
g[2] = (byte)(_a >> 16);
g[3] = (byte)(_a >> 24);
g[4] = (byte)(_b);
g[5] = (byte)(_b >> 8);
g[6] = (byte)(_c);
g[7] = (byte)(_c >> 8);
g[8] = _d;
g[9] = _e;
g[10] = _f;
g[11] = _g;
g[12] = _h;
g[13] = _i;
g[14] = _j;
g[15] = _k;
return g;
}
// Returns the guid in "registry" format.
public override String ToString()
{
return ToString("D",null);
}
public override int GetHashCode()
{
return _a ^ (((int)_b << 16) | (int)(ushort)_c) ^ (((int)_f << 24) | _k);
}
// Returns true if and only if the guid represented
// by o is the same as this instance.
public override bool Equals(Object o)
{
Guid g;
// Check that o is a Guid first
if(o == null || !(o is Guid))
return false;
else g = (Guid) o;
// Now compare each of the elements
if(g._a != _a)
return false;
if(g._b != _b)
return false;
if(g._c != _c)
return false;
if (g._d != _d)
return false;
if (g._e != _e)
return false;
if (g._f != _f)
return false;
if (g._g != _g)
return false;
if (g._h != _h)
return false;
if (g._i != _i)
return false;
if (g._j != _j)
return false;
if (g._k != _k)
return false;
return true;
}
public bool Equals(Guid g)
{
// Now compare each of the elements
if(g._a != _a)
return false;
if(g._b != _b)
return false;
if(g._c != _c)
return false;
if (g._d != _d)
return false;
if (g._e != _e)
return false;
if (g._f != _f)
return false;
if (g._g != _g)
return false;
if (g._h != _h)
return false;
if (g._i != _i)
return false;
if (g._j != _j)
return false;
if (g._k != _k)
return false;
return true;
}
private int GetResult(uint me, uint them) {
if (me 9) ? a - 10 + 0x61 : a + 0x30);
}
private static int HexsToChars(char[] guidChars, int offset, int a, int b)
{
guidChars[offset++] = HexToChar(a>>4);
guidChars[offset++] = HexToChar(a);
guidChars[offset++] = HexToChar(b>>4);
guidChars[offset++] = HexToChar(b);
return offset;
}
// IFormattable interface
// We currently ignore provider
public String ToString(String format, IFormatProvider provider)
{
if (format == null || format.Length == 0)
format = "D";
char[] guidChars;
int offset = 0;
int strLength = 38;
bool dash = true;
if( format.Length != 1) {
// all acceptable format string are of length 1
throw new FormatException(Environment.GetResourceString("Format_InvalidGuidFormatSpecification"));
}
char formatCh = format[0];
if (formatCh == 'D' || formatCh == 'd') {
guidChars = new char[36];
strLength = 36;
}
else if (formatCh == 'N' || formatCh == 'n') {
guidChars = new char[32];
strLength = 32;
dash = false;
}
else if (formatCh == 'B' || formatCh == 'b') {
guidChars = new char[38];
guidChars[offset++] = '{';
guidChars[37] = '}';
}
else if (formatCh == 'P' || formatCh == 'p') {
guidChars = new char[38];
guidChars[offset++] = '(';
guidChars[37] = ')';
}
else {
throw new FormatException(Environment.GetResourceString("Format_InvalidGuidFormatSpecification"));
}
offset = HexsToChars(guidChars, offset, _a >> 24, _a >> 16);
offset = HexsToChars(guidChars, offset, _a >> 8, _a);
if (dash) guidChars[offset++] = '-';
offset = HexsToChars(guidChars, offset, _b >> 8, _b);
if (dash) guidChars[offset++] = '-';
offset = HexsToChars(guidChars, offset, _c >> 8, _c);
if (dash) guidChars[offset++] = '-';
offset = HexsToChars(guidChars, offset, _d, _e);
if (dash) guidChars[offset++] = '-';
offset = HexsToChars(guidChars, offset, _f, _g);
offset = HexsToChars(guidChars, offset, _h, _i);
offset = HexsToChars(guidChars, offset, _j, _k);
return new String(guidChars, 0, strLength);
}
}
}
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