/// <summary>
/// Writes the bytes from the given ByteFilter into the given byte array
/// starting at the given index.
/// </summary>
public static void WriteBytes(byte[] writeTo, long startIndex, ByteFilter data)
{
for (long i = 0; i < data.Length; i++)
{
if (data.IsWildcardIndex(i))
{
continue;
}
else
{
writeTo[startIndex + i] = data.Bytes[i];
}
}
}
/// <summary>
/// Returns the start index of the first occurrence of the given ByteFilter.
/// </summary>
public static long GetStartIndex(byte[] fileBytes, ByteFilter findBytes)
{
long matchIndex = 0;
for (long i = 0; i < fileBytes.Length; i++)
{
if (findBytes.IsWildcardIndex(matchIndex) || fileBytes[i] == findBytes.Bytes[matchIndex])
{
matchIndex++;
if (matchIndex == findBytes.Length)
{
return(i - matchIndex + 1);
}
}
else
{
matchIndex = 0;
}
}
return(-1);
}
static void Main(string[] args)
{
var configFilePath = "config.cfg";
if (args.Length > 0)
{
configFilePath = args[0];
}
if (!File.Exists(configFilePath))
{
Console.WriteLine($"Configuration file '{configFilePath}' not found.");
Console.WriteLine($"Working directory path: {Directory.GetCurrentDirectory()}");
}
else
{
var config = File.ReadAllLines(configFilePath);
if (config.Length < 3)
{
Console.WriteLine("Invalid config file.");
Console.WriteLine("Please use the following format:");
Console.WriteLine("BINARY FILE PATH");
Console.WriteLine("ORIGINAL BYTES TO FIND");
Console.WriteLine("MODIFIED BYTES TO REPLACE THE ORIGINAL WITH");
}
else
{
var filePath = config[0];
var originalHex = config[1];
var modifiedHex = config[2];
if (!File.Exists(filePath))
{
Console.WriteLine($"File '{filePath}' does not exist.");
}
else
{
var fileBytes = File.ReadAllBytes(filePath);
var originalBytes = new ByteFilter(originalHex);
var moddedBytes = new ByteFilter(modifiedHex);
// Try to find the original bytes from the file
var startIndex = GetStartIndex(fileBytes, originalBytes);
if (startIndex < 0)
{
Console.WriteLine("Original bytes were not found.");
}
else
{
// Make a backup file
if (SafeWriteBytesToFile(filePath + ".bak", fileBytes))
{
// Replace with the modified bytes & overwrite the original file
WriteBytes(fileBytes, startIndex, moddedBytes);
SafeWriteBytesToFile(filePath, fileBytes);
}
}
}
}
}
Console.ReadKey();
}
