using System;
using System.IO;
using System.Text;
namespace IPA.Utilities
{
///
/// A class providing static utility functions that in any other language would just *exist*.
///
public static class Utils
{
///
/// Converts a hex string to a byte array.
///
/// the hex stream
/// the corresponding byte array
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;
}
///
/// Converts a byte array to a hex string.
///
/// the byte array
/// the hex form of the array
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
///
/// Uses unsafe code to compare 2 byte arrays quickly.
///
/// array 1
/// array 2
/// whether or not they are byte-for-byte equal
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;
}
}
///
/// Gets a path relative to the provided folder.
///
/// the file to relativize
/// the source folder
/// a path to get from to
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));
}
///
/// Copies all files from to .
///
/// the source directory
/// the destination directory
///
public static void CopyAll(DirectoryInfo source, DirectoryInfo target, string appendFileName = "")
{
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())
{
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);
}
// Copy each subdirectory using recursion.
foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
{
DirectoryInfo nextTargetSubDir =
target.CreateSubdirectory(diSourceSubDir.Name);
CopyAll(diSourceSubDir, nextTargetSubDir, appendFileName);
}
}
}
}