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GeezerVison is showing github.com — ReClass.NET/ReClass.NET/MemoryScanner/BytePattern.cs at master · ReClassNET/ReClass.NET Expand file tree/ Copy pathBytePattern.csMore file actions 345 lines (295 loc) · 8.68 KB / Copy pathBytePattern.csFile metadata and controls345 lines (295 loc) · 8.68 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 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 PatternMaskFormat { /// <summary> /// Example: AA BB ?? D? ?E FF /// </summary> Combined, /// <summary> /// Example: \xAA\xBB\x00\x00\x00\xFF xx???x /// </summary> Separated } public class BytePattern { private interface IPatternByte { /// <summary> /// Gets the byte value of the pattern byte if possible. /// </summary> /// <returns></returns> byte ToByte(); /// <summary> /// Compares the pattern byte with the given byte. /// </summary> /// <param name="b"></param> /// <returns></returns> bool Equals(byte b); /// <summary> /// Formats the pattern byte as string. /// </summary> /// <param name="format"></param> /// <returns></returns> Tuple<string, string> ToString(PatternMaskFormat format); } private class PatternByte : IPatternByte { private struct Nibble { public int Value; public bool IsWildcard; } private Nibble nibble1; private Nibble nibble2; public bool HasWildcard => nibble1.IsWildcard || nibble2.IsWildcard; public byte ToByte() => !HasWildcard ? (byte)((nibble1.Value << 4) + nibble2.Value) : throw new InvalidOperationException(); public static PatternByte NewWildcardByte() { 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) { if (nibble1.IsWildcard || ((b >> 4) & 0xF) == nibble1.Value) { if (nibble2.IsWildcard || (b & 0xF) == nibble2.Value) { return true; } } return false; } public Tuple<string, string> ToString(PatternMaskFormat format) { switch (format) { case PatternMaskFormat.Separated: return HasWildcard ? Tuple.Create("\\x00", "?") : Tuple.Create($"\\x{ToByte():X02}", "x"); case PatternMaskFormat.Combined: var sb = new StringBuilder(); if (nibble1.IsWildcard) sb.Append('?'); else sb.AppendFormat("{0:X}", nibble1.Value); if (nibble2.IsWildcard) sb.Append('?'); else sb.AppendFormat("{0:X}", nibble2.Value); return Tuple.Create(sb.ToString(), (string)null); default: throw new ArgumentOutOfRangeException(nameof(format), format, null); } } public override string ToString() => ToString(PatternMaskFormat.Combined).Item1; } private class SimplePatternByte : IPatternByte { private readonly byte value; public SimplePatternByte(byte value) { this.value = value; } public byte ToByte() => value; public bool Equals(byte b) => value == b; public Tuple<string, string> ToString(PatternMaskFormat format) { switch (format) { case PatternMaskFormat.Separated: return Tuple.Create($"\\x{ToByte():X02}", "x"); case PatternMaskFormat.Combined: return Tuple.Create($"{ToByte():X02}", (string)null); default: throw new ArgumentOutOfRangeException(nameof(format), format, null); } } } private readonly List<IPatternByte> pattern = new List<IPatternByte>(); /// <summary> /// Gets the length of the pattern in byte. /// </summary> public int Length => pattern.Count; /// <summary> /// Gets if the pattern contains wildcards. /// </summary> public bool HasWildcards => pattern.Any(pb => pb is PatternByte pb2 && pb2.HasWildcard); private BytePattern() { } /// <summary> /// Parses the provided string for a byte pattern. Wildcards are supported by nibble. /// </summary> /// <example> /// Valid patterns: /// AA BB CC DD /// AABBCCDD /// aabb CCdd /// A? ?B ?? DD /// </example> /// <exception cref="ArgumentException">Thrown if the provided string doesn't contain a valid byte pattern.</exception> /// <param name="value">The byte pattern in hex format.</param> /// <returns>The corresponding <see cref="BytePattern"/>.</returns> public static BytePattern Parse(string value) { Contract.Requires(!string.IsNullOrEmpty(value)); Contract.Ensures(Contract.Result<BytePattern>() != null); var pattern = new BytePattern(); using var sr = new StringReader(value); while (true) { var pb = new PatternByte(); if (pb.TryRead(sr)) { if (!pb.HasWildcard) { pattern.pattern.Add(new SimplePatternByte(pb.ToByte())); } else { pattern.pattern.Add(pb); } } else { break; } } // Check if we are not at the end of the stream if (sr.Peek() != -1) { throw new ArgumentException($"'{value}' is not a valid byte pattern."); } return pattern; } /// <summary> /// Creates a byte pattern from the provided bytes. /// </summary> /// <param name="data">The bytes to match.</param> /// <returns></returns> public static BytePattern From(IEnumerable<byte> data) { var pattern = new BytePattern(); pattern.pattern.AddRange(data.Select(b => new SimplePatternByte(b))); return pattern; } /// <summary> /// Creates a byte pattern with wildcard support from the provided bytes. The boolean tuple item signals a wildcard. /// </summary> /// <param name="data">The byte data or the wildcard flag.</param> /// <returns></returns> public static BytePattern From(IEnumerable<Tuple<byte, bool>> data) { var pattern = new BytePattern(); foreach (var (value, isWildcard) in data) { var pb = isWildcard ? (IPatternByte)PatternByte.NewWildcardByte() : new SimplePatternByte(value); pattern.pattern.Add(pb); } return pattern; } /// <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; } /// <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.ToByte()).ToArray(); } /// <summary> /// Formats the <see cref="BytePattern"/> in the specified <see cref="PatternMaskFormat"/>. /// </summary> /// <param name="format">The format of the pattern.</param> /// <returns>A tuple containing the format. If <paramref name="format"/> is not <see cref="PatternMaskFormat.Separated"/> the second item is null.</returns> public Tuple<string, string> ToString(PatternMaskFormat format) { switch (format) { case PatternMaskFormat.Separated: var sb1 = new StringBuilder(); var sb2 = new StringBuilder(); pattern .Select(p => p.ToString(PatternMaskFormat.Separated)) .ForEach(t => { sb1.Append(t.Item1); sb2.Append(t.Item2); }); return Tuple.Create(sb1.ToString(), sb2.ToString()); case PatternMaskFormat.Combined: return Tuple.Create<string, string>(string.Join(" ", pattern.Select(p => p.ToString(PatternMaskFormat.Combined).Item1)), null); default: throw new ArgumentOutOfRangeException(nameof(format), format, null); } } public override string ToString() => ToString(PatternMaskFormat.Combined).Item1; } } |
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