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using System;
using System.IO;
using System.Text;
using System.Linq;
using System.Collections.Generic;
#if NET3
using File = Net3_Proxy.File;
#endif
namespace IPA.Utilities
{
/// <summary>
/// A class providing static utility functions that in any other language would just *exist*.
/// </summary>
public static class Utils
{
/// <summary>
/// Converts a hex string to a byte array.
/// </summary>
/// <param name="hex">the hex stream</param>
/// <returns>the corresponding byte array</returns>
public static byte[] StringToByteArray(string hex)
{
int numberChars = hex.Length;
byte[] bytes = new byte[numberChars / 2];
for (int i = 0; i < numberChars; i += 2)
bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
return bytes;
}
/// <summary>
/// Converts a byte array to a hex string.
/// </summary>
/// <param name="ba">the byte array</param>
/// <returns>the hex form of the array</returns>
public static string ByteArrayToString(byte[] ba)
{
StringBuilder hex = new StringBuilder(ba.Length * 2);
foreach (byte b in ba)
hex.AppendFormat("{0:x2}", b);
return hex.ToString();
}
// Copyright (c) 2008-2013 Hafthor Stefansson
// Distributed under the MIT/X11 software license
// Ref: http://www.opensource.org/licenses/mit-license.php.
// From: https://stackoverflow.com/a/8808245/3117125
/// <summary>
/// Uses unsafe code to compare 2 byte arrays quickly.
/// </summary>
/// <param name="a1">array 1</param>
/// <param name="a2">array 2</param>
/// <returns>whether or not they are byte-for-byte equal</returns>
public static unsafe bool UnsafeCompare(byte[] a1, byte[] a2)
{
if (a1 == a2) return true;
if (a1 == null || a2 == null || a1.Length != a2.Length)
return false;
fixed (byte* p1 = a1, p2 = a2)
{
byte* x1 = p1, x2 = p2;
int l = a1.Length;
for (int i = 0; i < l / 8; i++, x1 += 8, x2 += 8)
if (*((long*)x1) != *((long*)x2)) return false;
if ((l & 4) != 0) { if (*((int*)x1) != *((int*)x2)) return false; x1 += 4; x2 += 4; }
if ((l & 2) != 0) { if (*((short*)x1) != *((short*)x2)) return false; x1 += 2; x2 += 2; }
if ((l & 1) != 0) if (*x1 != *x2) return false;
return true;
}
}
/// <summary>
/// Gets a path relative to the provided folder.
/// </summary>
/// <param name="file">the file to relativize</param>
/// <param name="folder">the source folder</param>
/// <returns>a path to get from <paramref name="folder"/> to <paramref name="file"/></returns>
public static string GetRelativePath(string file, string folder)
{
Uri pathUri = new Uri(file);
// Folders must end in a slash
if (!folder.EndsWith(Path.DirectorySeparatorChar.ToString()))
{
folder += Path.DirectorySeparatorChar;
}
Uri folderUri = new Uri(folder);
return Uri.UnescapeDataString(folderUri.MakeRelativeUri(pathUri).ToString().Replace('/', Path.DirectorySeparatorChar));
}
/// <summary>
/// Copies all files from <paramref name="source"/> to <paramref name="target"/>.
/// </summary>
/// <param name="source">the source directory</param>
/// <param name="target">the destination directory</param>
/// <param name="appendFileName">the filename of the file to append together</param>
/// <param name="onCopyException">a delegate called when there is an error copying. Return true to keep going.</param>
public static void CopyAll(DirectoryInfo source, DirectoryInfo target, string appendFileName = "",
Func<Exception, FileInfo, bool> onCopyException = null)
{
if (source.FullName.ToLower() == target.FullName.ToLower())
{
return;
}
// Check if the target directory exists, if not, create it.
if (Directory.Exists(target.FullName) == false)
{
Directory.CreateDirectory(target.FullName);
}
// Copy each file into it's new directory.
foreach (FileInfo fi in source.GetFiles())
{
try
{
if (fi.Name == appendFileName)
File.AppendAllLines(Path.Combine(target.ToString(), fi.Name), File.ReadAllLines(fi.FullName));
else
fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);
}
catch (Exception e)
{
var keepOn = onCopyException?.Invoke(e, fi);
if (!keepOn.Unwrap())
throw;
}
}
// Copy each subdirectory using recursion.
foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
{
DirectoryInfo nextTargetSubDir =
target.CreateSubdirectory(diSourceSubDir.Name);
CopyAll(diSourceSubDir, nextTargetSubDir, appendFileName, onCopyException);
}
}
/// <summary>
/// Whether you can safely use <see cref="DateTime.Now"/> without Mono throwing a fit.
/// </summary>
/// <value><see langword="true"/> if you can use <see cref="DateTime.Now"/> safely, <see langword="false"/> otherwise</value>
public static bool CanUseDateTimeNowSafely { get; private set; } = true;
private static bool DateTimeSafetyUnknown = true;
private static ulong UnsafeAdvanceTicks = 1;
/// <summary>
/// Gets the current <see cref="DateTime"/> if supported, otherwise, if Mono would throw a fit,
/// returns <see cref="DateTime.MinValue"/> plus some value, such that each time it is called
/// the value will be greater than the previous result. Not suitable for timing.
/// </summary>
/// <returns>the current <see cref="DateTime"/> if supported, otherwise some indeterminant increasing value.</returns>
public static DateTime CurrentTime()
{
if (DateTimeSafetyUnknown)
{
DateTime time = DateTime.MinValue;
try
{
time = DateTime.Now;
}
catch (TimeZoneNotFoundException)
{ // Mono did a fucky wucky and we need to avoid this call
CanUseDateTimeNowSafely = false;
}
DateTimeSafetyUnknown = false;
return time;
}
else
{
if (CanUseDateTimeNowSafely) return DateTime.Now;
else return DateTime.MinValue.AddTicks((long)UnsafeAdvanceTicks++); // return MinValue as a fallback
}
}
/// <summary>
/// Compares a pair of <see cref="SemVer.Version"/>s ignoring both the prerelease and build fields.
/// </summary>
/// <param name="l">the left value</param>
/// <param name="r">the right value</param>
/// <returns>-1 if l is less than r, 0 if they are equal in the numeric portion, or 1 if l is greater than r</returns>
public static int VersionCompareNoPrerelease(SemVer.Version l, SemVer.Version r)
{
var cmpVal = l.Major - r.Major;
if (cmpVal != 0) return cmpVal;
cmpVal = l.Minor - r.Minor;
if (cmpVal != 0) return cmpVal;
cmpVal = l.Patch - r.Patch;
return cmpVal;
}
#if NET4
internal static IEnumerable<string> StrJP(this IEnumerable<string> a) => a;
#endif
#if NET3
internal static string[] StrJP(this IEnumerable<string> a) => a.ToArray();
internal static string[] StrJP<T>(this IEnumerable<T> a) => a.Select(o => $"{o}" /* safer than .ToString() */).ToArray();
#endif
}
}