corrade-vassal – Rev 1
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using System;
using System.Text;
namespace OpenMetaverse
{
public static partial class Utils
{
/// <summary>
/// Operating system
/// </summary>
public enum Platform
{
/// <summary>Unknown</summary>
Unknown,
/// <summary>Microsoft Windows</summary>
Windows,
/// <summary>Microsoft Windows CE</summary>
WindowsCE,
/// <summary>Linux</summary>
Linux,
/// <summary>Apple OSX</summary>
OSX
}
/// <summary>
/// Runtime platform
/// </summary>
public enum Runtime
{
/// <summary>.NET runtime</summary>
Windows,
/// <summary>Mono runtime: http://www.mono-project.com/</summary>
Mono
}
public const float E = (float)Math.E;
public const float LOG10E = 0.4342945f;
public const float LOG2E = 1.442695f;
public const float PI = (float)Math.PI;
public const float TWO_PI = (float)(Math.PI * 2.0d);
public const float PI_OVER_TWO = (float)(Math.PI / 2.0d);
public const float PI_OVER_FOUR = (float)(Math.PI / 4.0d);
/// <summary>Used for converting degrees to radians</summary>
public const float DEG_TO_RAD = (float)(Math.PI / 180.0d);
/// <summary>Used for converting radians to degrees</summary>
public const float RAD_TO_DEG = (float)(180.0d / Math.PI);
/// <summary>Provide a single instance of the CultureInfo class to
/// help parsing in situations where the grid assumes an en-us
/// culture</summary>
public static readonly System.Globalization.CultureInfo EnUsCulture =
new System.Globalization.CultureInfo("en-us");
/// <summary>UNIX epoch in DateTime format</summary>
public static readonly DateTime Epoch = new DateTime(1970, 1, 1);
public static readonly byte[] EmptyBytes = new byte[0];
/// <summary>Provide a single instance of the MD5 class to avoid making
/// duplicate copies and handle thread safety</summary>
private static readonly System.Security.Cryptography.MD5 MD5Builder =
new System.Security.Cryptography.MD5CryptoServiceProvider();
/// <summary>Provide a single instance of the SHA-1 class to avoid
/// making duplicate copies and handle thread safety</summary>
private static readonly System.Security.Cryptography.SHA1 SHA1Builder =
new System.Security.Cryptography.SHA1CryptoServiceProvider();
private static readonly System.Security.Cryptography.SHA256 SHA256Builder =
new System.Security.Cryptography.SHA256Managed();
/// <summary>Provide a single instance of a random number generator
/// to avoid making duplicate copies and handle thread safety</summary>
private static readonly Random RNG = new Random();
#region Math
/// <summary>
/// Clamp a given value between a range
/// </summary>
/// <param name="value">Value to clamp</param>
/// <param name="min">Minimum allowable value</param>
/// <param name="max">Maximum allowable value</param>
/// <returns>A value inclusively between lower and upper</returns>
public static float Clamp(float value, float min, float max)
{
// First we check to see if we're greater than the max
value = (value > max) ? max : value;
// Then we check to see if we're less than the min.
value = (value < min) ? min : value;
// There's no check to see if min > max.
return value;
}
/// <summary>
/// Clamp a given value between a range
/// </summary>
/// <param name="value">Value to clamp</param>
/// <param name="min">Minimum allowable value</param>
/// <param name="max">Maximum allowable value</param>
/// <returns>A value inclusively between lower and upper</returns>
public static double Clamp(double value, double min, double max)
{
// First we check to see if we're greater than the max
value = (value > max) ? max : value;
// Then we check to see if we're less than the min.
value = (value < min) ? min : value;
// There's no check to see if min > max.
return value;
}
/// <summary>
/// Clamp a given value between a range
/// </summary>
/// <param name="value">Value to clamp</param>
/// <param name="min">Minimum allowable value</param>
/// <param name="max">Maximum allowable value</param>
/// <returns>A value inclusively between lower and upper</returns>
public static int Clamp(int value, int min, int max)
{
// First we check to see if we're greater than the max
value = (value > max) ? max : value;
// Then we check to see if we're less than the min.
value = (value < min) ? min : value;
// There's no check to see if min > max.
return value;
}
/// <summary>
/// Round a floating-point value to the nearest integer
/// </summary>
/// <param name="val">Floating point number to round</param>
/// <returns>Integer</returns>
public static int Round(float val)
{
return (int)Math.Floor(val + 0.5f);
}
/// <summary>
/// Test if a single precision float is a finite number
/// </summary>
public static bool IsFinite(float value)
{
return !(Single.IsNaN(value) || Single.IsInfinity(value));
}
/// <summary>
/// Test if a double precision float is a finite number
/// </summary>
public static bool IsFinite(double value)
{
return !(Double.IsNaN(value) || Double.IsInfinity(value));
}
/// <summary>
/// Get the distance between two floating-point values
/// </summary>
/// <param name="value1">First value</param>
/// <param name="value2">Second value</param>
/// <returns>The distance between the two values</returns>
public static float Distance(float value1, float value2)
{
return Math.Abs(value1 - value2);
}
public static float Hermite(float value1, float tangent1, float value2, float tangent2, float amount)
{
// All transformed to double not to lose precission
// Otherwise, for high numbers of param:amount the result is NaN instead of Infinity
double v1 = value1, v2 = value2, t1 = tangent1, t2 = tangent2, s = amount, result;
double sCubed = s * s * s;
double sSquared = s * s;
if (amount == 0f)
result = value1;
else if (amount == 1f)
result = value2;
else
result = (2d * v1 - 2d * v2 + t2 + t1) * sCubed +
(3d * v2 - 3d * v1 - 2d * t1 - t2) * sSquared +
t1 * s + v1;
return (float)result;
}
public static double Hermite(double value1, double tangent1, double value2, double tangent2, double amount)
{
// All transformed to double not to lose precission
// Otherwise, for high numbers of param:amount the result is NaN instead of Infinity
double v1 = value1, v2 = value2, t1 = tangent1, t2 = tangent2, s = amount, result;
double sCubed = s * s * s;
double sSquared = s * s;
if (amount == 0d)
result = value1;
else if (amount == 1f)
result = value2;
else
result = (2d * v1 - 2d * v2 + t2 + t1) * sCubed +
(3d * v2 - 3d * v1 - 2d * t1 - t2) * sSquared +
t1 * s + v1;
return result;
}
public static float Lerp(float value1, float value2, float amount)
{
return value1 + (value2 - value1) * amount;
}
public static double Lerp(double value1, double value2, double amount)
{
return value1 + (value2 - value1) * amount;
}
public static float SmoothStep(float value1, float value2, float amount)
{
// It is expected that 0 < amount < 1
// If amount < 0, return value1
// If amount > 1, return value2
float result = Utils.Clamp(amount, 0f, 1f);
return Utils.Hermite(value1, 0f, value2, 0f, result);
}
public static double SmoothStep(double value1, double value2, double amount)
{
// It is expected that 0 < amount < 1
// If amount < 0, return value1
// If amount > 1, return value2
double result = Utils.Clamp(amount, 0f, 1f);
return Utils.Hermite(value1, 0f, value2, 0f, result);
}
public static float ToDegrees(float radians)
{
// This method uses double precission internally,
// though it returns single float
// Factor = 180 / pi
return (float)(radians * 57.295779513082320876798154814105);
}
public static float ToRadians(float degrees)
{
// This method uses double precission internally,
// though it returns single float
// Factor = pi / 180
return (float)(degrees * 0.017453292519943295769236907684886);
}
/// <summary>
/// Compute the MD5 hash for a byte array
/// </summary>
/// <param name="data">Byte array to compute the hash for</param>
/// <returns>MD5 hash of the input data</returns>
public static byte[] MD5(byte[] data)
{
lock (MD5Builder)
return MD5Builder.ComputeHash(data);
}
/// <summary>
/// Compute the SHA1 hash for a byte array
/// </summary>
/// <param name="data">Byte array to compute the hash for</param>
/// <returns>SHA1 hash of the input data</returns>
public static byte[] SHA1(byte[] data)
{
lock (SHA1Builder)
return SHA1Builder.ComputeHash(data);
}
/// <summary>
/// Calculate the SHA1 hash of a given string
/// </summary>
/// <param name="value">The string to hash</param>
/// <returns>The SHA1 hash as a string</returns>
public static string SHA1String(string value)
{
StringBuilder digest = new StringBuilder(40);
byte[] hash = SHA1(Encoding.UTF8.GetBytes(value));
// Convert the hash to a hex string
foreach (byte b in hash)
digest.AppendFormat(Utils.EnUsCulture, "{0:x2}", b);
return digest.ToString();
}
/// <summary>
/// Compute the SHA256 hash for a byte array
/// </summary>
/// <param name="data">Byte array to compute the hash for</param>
/// <returns>SHA256 hash of the input data</returns>
public static byte[] SHA256(byte[] data)
{
lock (SHA256Builder)
return SHA256Builder.ComputeHash(data);
}
/// <summary>
/// Calculate the SHA256 hash of a given string
/// </summary>
/// <param name="value">The string to hash</param>
/// <returns>The SHA256 hash as a string</returns>
public static string SHA256String(string value)
{
StringBuilder digest = new StringBuilder(64);
byte[] hash = SHA256(Encoding.UTF8.GetBytes(value));
// Convert the hash to a hex string
foreach (byte b in hash)
digest.AppendFormat(Utils.EnUsCulture, "{0:x2}", b);
return digest.ToString();
}
/// <summary>
/// Calculate the MD5 hash of a given string
/// </summary>
/// <param name="password">The password to hash</param>
/// <returns>An MD5 hash in string format, with $1$ prepended</returns>
public static string MD5(string password)
{
StringBuilder digest = new StringBuilder(32);
byte[] hash = MD5(ASCIIEncoding.Default.GetBytes(password));
// Convert the hash to a hex string
foreach (byte b in hash)
digest.AppendFormat(Utils.EnUsCulture, "{0:x2}", b);
return "$1$" + digest.ToString();
}
/// <summary>
/// Calculate the MD5 hash of a given string
/// </summary>
/// <param name="value">The string to hash</param>
/// <returns>The MD5 hash as a string</returns>
public static string MD5String(string value)
{
StringBuilder digest = new StringBuilder(32);
byte[] hash = MD5(Encoding.UTF8.GetBytes(value));
// Convert the hash to a hex string
foreach (byte b in hash)
digest.AppendFormat(Utils.EnUsCulture, "{0:x2}", b);
return digest.ToString();
}
/// <summary>
/// Generate a random double precision floating point value
/// </summary>
/// <returns>Random value of type double</returns>
public static double RandomDouble()
{
lock (RNG)
return RNG.NextDouble();
}
#endregion Math
#region Platform
/// <summary>
/// Get the current running platform
/// </summary>
/// <returns>Enumeration of the current platform we are running on</returns>
public static Platform GetRunningPlatform()
{
const string OSX_CHECK_FILE = "/Library/Extensions.kextcache";
if (Environment.OSVersion.Platform == PlatformID.WinCE)
{
return Platform.WindowsCE;
}
else
{
int plat = (int)Environment.OSVersion.Platform;
if ((plat != 4) && (plat != 128))
{
return Platform.Windows;
}
else
{
if (System.IO.File.Exists(OSX_CHECK_FILE))
return Platform.OSX;
else
return Platform.Linux;
}
}
}
/// <summary>
/// Get the current running runtime
/// </summary>
/// <returns>Enumeration of the current runtime we are running on</returns>
public static Runtime GetRunningRuntime()
{
Type t = Type.GetType("Mono.Runtime");
if (t != null)
return Runtime.Mono;
else
return Runtime.Windows;
}
#endregion Platform
}
}