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Copy pathScanResultStore.cs
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272 lines (233 loc) · 6.81 KB
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using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.Text;
using ReClassNET.Extensions;
namespace ReClassNET.MemoryScanner
{
/// <summary>
/// The store of all found scan results. If the result count exceed the <see cref="MaximumMemoryResultsCount"/> limit,
/// the results are stored in temporary files.
/// </summary>
internal class ScanResultStore : IDisposable
{
private enum StorageMode
{
Memory,
File
}
private const int MaximumMemoryResultsCount = 10000000;
private readonly List<ScanResultBlock> store = new List<ScanResultBlock>();
private readonly string storePath;
private FileStream fileStream;
private StorageMode mode = StorageMode.Memory;
private readonly ScanValueType valueType;
/// <summary>
/// Gets the number of total results.
/// </summary>
public int TotalResultCount { get; private set; }
public ScanResultStore(ScanValueType valueType, string storePath)
{
this.valueType = valueType;
this.storePath = Path.Combine(storePath, $"ReClass.NET_MemoryScanner_{Guid.NewGuid()}.tmp");
}
public void Dispose()
{
Finish();
store.Clear();
try
{
if (File.Exists(storePath))
{
File.Delete(storePath);
}
}
catch
{
// ignored
}
}
public void Finish()
{
if (mode == StorageMode.File)
{
fileStream?.Dispose();
fileStream = null;
}
}
/// <summary>
/// Gets the result blocks from the store. This may read results from files..
/// </summary>
public IEnumerable<ScanResultBlock> GetResultBlocks()
{
Contract.Ensures(Contract.Result<IEnumerable<ScanResultBlock>>() != null);
return mode == StorageMode.Memory ? store : ReadBlocksFromFile();
}
/// <summary>
/// Adds a result block to the store. If the result count exceed the <see cref="MaximumMemoryResultsCount"/> limit,
/// the results are stored in temporary files.
/// </summary>
/// <param name="block">The result block to add.</param>
public void AddBlock(ScanResultBlock block)
{
Contract.Requires(block != null);
lock (store)
{
TotalResultCount += block.Results.Count;
if (mode == StorageMode.Memory)
{
if (TotalResultCount > MaximumMemoryResultsCount)
{
mode = StorageMode.File;
fileStream = File.OpenWrite(storePath);
foreach (var b in store)
{
AppendBlockToFile(b);
}
store.Clear();
store.TrimExcess();
AppendBlockToFile(block);
}
else
{
store.Add(block);
}
}
else
{
AppendBlockToFile(block);
}
}
}
/// <summary>
/// Writes a result block to the file.
/// </summary>
/// <param name="block">The result block to add.</param>
private void AppendBlockToFile(ScanResultBlock block)
{
Contract.Requires(block != null);
using var bw = new BinaryWriter(fileStream, Encoding.Unicode, true);
bw.Write(block.Start);
bw.Write(block.End);
bw.Write(block.Results.Count);
foreach (var result in block.Results)
{
WriteSearchResult(bw, result);
}
}
/// <summary>
/// Reads all memory blocks from the file.
/// </summary>
private IEnumerable<ScanResultBlock> ReadBlocksFromFile()
{
Contract.Ensures(Contract.Result<IEnumerable<ScanResultBlock>>() != null);
using var stream = File.OpenRead(storePath);
using var br = new BinaryReader(stream, Encoding.Unicode);
var length = stream.Length;
while (stream.Position < length)
{
var start = br.ReadIntPtr();
var end = br.ReadIntPtr();
var resultCount = br.ReadInt32();
var results = new List<ScanResult>(resultCount);
for (var i = 0; i < resultCount; ++i)
{
results.Add(ReadScanResult(br));
}
yield return new ScanResultBlock(start, end, results);
}
}
/// <summary>
/// Reads a single scan result from the file.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">Thrown if the <see cref="ScanValueType"/> is not valid.</exception>
/// <param name="br">The <see cref="BinaryReader"/> to read from.</param>
/// <returns>The scan result.</returns>
private ScanResult ReadScanResult(BinaryReader br)
{
Contract.Ensures(Contract.Result<ScanResult>() != null);
var address = br.ReadIntPtr();
ScanResult result;
switch (valueType)
{
case ScanValueType.Byte:
result = new ByteScanResult(br.ReadByte());
break;
case ScanValueType.Short:
result = new ShortScanResult(br.ReadInt16());
break;
case ScanValueType.Integer:
result = new IntegerScanResult(br.ReadInt32());
break;
case ScanValueType.Long:
result = new LongScanResult(br.ReadInt64());
break;
case ScanValueType.Float:
result = new FloatScanResult(br.ReadSingle());
break;
case ScanValueType.Double:
result = new DoubleScanResult(br.ReadDouble());
break;
case ScanValueType.ArrayOfBytes:
result = new ArrayOfBytesScanResult(br.ReadBytes(br.ReadInt32()));
break;
case ScanValueType.String:
case ScanValueType.Regex:
var encoding = br.ReadInt32() switch
{
0 => Encoding.UTF8,
1 => Encoding.Unicode,
_ => Encoding.UTF32
};
var value = br.ReadString();
result = valueType == ScanValueType.String ? new StringScanResult(value, encoding) : new RegexStringScanResult(value, encoding);
break;
default:
throw new ArgumentOutOfRangeException();
}
result.Address = address;
return result;
}
/// <summary>
/// Writes a single scan result to the file.
/// </summary>
/// <param name="bw">The <see cref="BinaryWriter"/> to write to.</param>
/// <param name="result">The result to write.</param>
private static void WriteSearchResult(BinaryWriter bw, ScanResult result)
{
Contract.Requires(bw != null);
Contract.Requires(result != null);
bw.Write(result.Address);
switch (result)
{
case ByteScanResult byteSearchResult:
bw.Write(byteSearchResult.Value);
break;
case ShortScanResult shortSearchResult:
bw.Write(shortSearchResult.Value);
break;
case IntegerScanResult integerSearchResult:
bw.Write(integerSearchResult.Value);
break;
case LongScanResult longSearchResult:
bw.Write(longSearchResult.Value);
break;
case FloatScanResult floatSearchResult:
bw.Write(floatSearchResult.Value);
break;
case DoubleScanResult doubleSearchResult:
bw.Write(doubleSearchResult.Value);
break;
case ArrayOfBytesScanResult arrayOfBytesSearchResult:
bw.Write(arrayOfBytesSearchResult.Value.Length);
bw.Write(arrayOfBytesSearchResult.Value);
break;
case StringScanResult stringSearchResult:
bw.Write(stringSearchResult.Encoding.IsSameCodePage(Encoding.UTF8) ? 0 : stringSearchResult.Encoding.IsSameCodePage(Encoding.Unicode) ? 1 : 2);
bw.Write(stringSearchResult.Value);
break;
}
}
}
}