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Copy pathBytePattern.cs
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308 lines (263 loc) · 7.59 KB
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using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Text;
using ReClassNET.Extensions;
namespace ReClassNET.MemoryScanner
{
public enum PatternFormat
{
/// <summary>
/// Example: AA BB ?? D? ?E FF
/// </summary>
Combined,
/// <summary>
/// Example: \xAA\xBB\x00\x00\x00\xFF xx???x
/// </summary>
PatternAndMask
}
public class BytePattern
{
private struct PatternByte
{
private struct Nibble
{
public int Value;
public bool IsWildcard;
}
private Nibble nibble1;
private Nibble nibble2;
public bool HasWildcard => nibble1.IsWildcard || nibble2.IsWildcard;
public byte ByteValue => !HasWildcard ? (byte)((nibble1.Value << 4) + nibble2.Value) : throw new InvalidOperationException();
public static PatternByte AsByte(byte b)
{
var pb = new PatternByte
{
nibble1 = { Value = (b >> 4) & 0xF },
nibble2 = { Value = b & 0xF }
};
return pb;
}
public static PatternByte AsWildcard()
{
var pb = new PatternByte
{
nibble1 = { IsWildcard = true },
nibble2 = { IsWildcard = true }
};
return pb;
}
private static bool IsHexValue(char c)
{
return '0' <= c && c <= '9'
|| 'A' <= c && c <= 'F'
|| 'a' <= c && c <= 'f';
}
private static int HexToInt(char c)
{
if ('0' <= c && c <= '9') return c - '0';
if ('A' <= c && c <= 'F') return c - 'A' + 10;
return c - 'a' + 10;
}
public bool TryRead(StringReader sr)
{
Contract.Requires(sr != null);
var temp = sr.ReadSkipWhitespaces();
if (temp == -1 || !IsHexValue((char)temp) && (char)temp != '?')
{
return false;
}
nibble1.Value = HexToInt((char)temp) & 0xF;
nibble1.IsWildcard = (char)temp == '?';
temp = sr.Read();
if (temp == -1 || char.IsWhiteSpace((char)temp) || (char)temp == '?')
{
nibble2.IsWildcard = true;
return true;
}
if (!IsHexValue((char)temp))
{
return false;
}
nibble2.Value = HexToInt((char)temp) & 0xF;
nibble2.IsWildcard = false;
return true;
}
public bool Equals(byte b)
{
var matched = 0;
if (nibble1.IsWildcard || ((b >> 4) & 0xF) == nibble1.Value)
{
++matched;
}
if (nibble2.IsWildcard || (b & 0xF) == nibble2.Value)
{
++matched;
}
return matched == 2;
}
public Tuple<string, string> ToString(PatternFormat format)
{
switch (format)
{
case PatternFormat.PatternAndMask:
return HasWildcard ? Tuple.Create("\\x00", "?") : Tuple.Create($"\\x{ByteValue:X02}", "x");
case PatternFormat.Combined:
var sb = new StringBuilder();
if (nibble1.IsWildcard) sb.Append('?');
else sb.AppendFormat("{0:X}", nibble1.Value);
if (nibble2.IsWildcard) sb.Append('?');
else sb.AppendFormat("{0:X}", nibble2.Value);
return Tuple.Create<string, string>(sb.ToString(), null);
default:
throw new ArgumentOutOfRangeException(nameof(format), format, null);
}
}
public override string ToString() => ToString(PatternFormat.Combined).Item1;
}
private readonly List<PatternByte> pattern = new List<PatternByte>();
/// <summary>
/// Gets the length of the pattern in byte.
/// </summary>
public int Length => pattern.Count;
/// <summary>
/// Gets if the pattern contains wildcards.
/// </summary>
public bool HasWildcards => pattern.Any(pb => pb.HasWildcard);
/// <summary>
/// Parses the provided string for a byte pattern. Wildcards are supported by nibble.
/// </summary>
/// <example>
/// Valid patterns:
/// AA BB CC DD
/// AABBCCDD
/// aabb CCdd
/// A? ?B ?? DD
/// </example>
/// <exception cref="ArgumentException">Thrown if the provided string doesn't contain a valid byte pattern.</exception>
/// <param name="value">The byte pattern in hex format.</param>
/// <returns>The corresponding <see cref="BytePattern"/>.</returns>
public static BytePattern Parse(string value)
{
Contract.Requires(!string.IsNullOrEmpty(value));
Contract.Ensures(Contract.Result<BytePattern>() != null);
var pattern = new BytePattern();
using (var sr = new StringReader(value))
{
var pb = new PatternByte();
while (pb.TryRead(sr))
{
pattern.pattern.Add(pb);
}
// Check if we are not at the end of the stream
if (sr.Peek() != -1)
{
throw new ArgumentException($"'{value}' is not a valid byte pattern.");
}
}
return pattern;
}
public static BytePattern From(IEnumerable<Tuple<byte, bool>> data)
{
var pattern = new BytePattern();
foreach (var i in data)
{
var pb = i.Item2 ? PatternByte.AsWildcard() : PatternByte.AsByte(i.Item1);
pattern.pattern.Add(pb);
}
return pattern;
}
// TODO: Use System.Span after it is available
/*/// <summary>
/// Tests if the provided byte array matches the byte pattern at the provided index.
/// </summary>
/// <param name="data">The byte array to be compared.</param>
/// <returns>True if the pattern matches, false if they are not.</returns>
public bool Equals(Span<byte> data)
{
Contract.Requires(data != null);
for (var j = 0; j < pattern.Count; ++j)
{
if (!pattern[j].Equals(data[j]))
{
return false;
}
}
return true;
}*/
/// <summary>
/// Tests if the provided byte array matches the byte pattern at the provided index.
/// </summary>
/// <param name="data">The byte array to be compared.</param>
/// <param name="index">The index into the byte array.</param>
/// <returns>True if the pattern matches, false if they are not.</returns>
public bool Equals(byte[] data, int index)
{
Contract.Requires(data != null);
for (var j = 0; j < pattern.Count; ++j)
{
if (!pattern[j].Equals(data[index + j]))
{
return false;
}
}
return true;
}
public unsafe bool Equals(byte* data)
{
Contract.Requires(data != null);
for (var j = 0; j < pattern.Count; ++j)
{
if (!pattern[j].Equals(*(data + j)))
{
return false;
}
}
return true;
}
/// <summary>
/// Converts this <see cref="BytePattern"/> to a byte array.
/// </summary>
/// <exception cref="InvalidOperationException">Thrown if the pattern contains wildcards.</exception>
/// <returns>The bytes of the pattern.
/// </returns>
public byte[] ToByteArray()
{
Contract.Ensures(Contract.Result<byte[]>() != null);
if (HasWildcards)
{
throw new InvalidOperationException();
}
return pattern.Select(pb => pb.ByteValue).ToArray();
}
/// <summary>
/// Formats the <see cref="BytePattern"/> in the specified <see cref="PatternFormat"/>.
/// </summary>
/// <param name="format">The format of the pattern.</param>
/// <returns>A tuple containing the format. If <paramref name="format"/> is not <see cref="PatternFormat.PatternAndMask"/> the second item is null.</returns>
public Tuple<string, string> ToString(PatternFormat format)
{
switch (format)
{
case PatternFormat.PatternAndMask:
var sb1 = new StringBuilder();
var sb2 = new StringBuilder();
pattern
.Select(p => p.ToString(PatternFormat.PatternAndMask))
.ForEach(t =>
{
sb1.Append(t.Item1);
sb2.Append(t.Item2);
});
return Tuple.Create(sb1.ToString(), sb2.ToString());
case PatternFormat.Combined:
return Tuple.Create<string, string>(string.Join(" ", pattern.Select(p => p.ToString(PatternFormat.Combined).Item1)), null);
default:
throw new ArgumentOutOfRangeException(nameof(format), format, null);
}
}
public override string ToString() => ToString(PatternFormat.Combined).Item1;
}
}