private static string FindFirstOfSplit(IAssetsFileProvider fp, string assetsFile)
{
int lastDot = assetsFile.LastIndexOf('.');
if (lastDot > 0)
{
string afterDot = assetsFile.Substring(lastDot, assetsFile.Length - lastDot);
string noSplit;
if (afterDot.ToLower().StartsWith(".split"))
{
noSplit = assetsFile.Substring(0, lastDot);
if (fp.FileExists(noSplit))
{
return(noSplit);
}
}
else
{
noSplit = assetsFile;
}
var split0 = noSplit + ".split0";
if (fp.FileExists(split0))
{
return(split0);
}
}
if (fp.FileExists(assetsFile))
{
return(assetsFile);
}
return(null);
}
public static bool Patch(IAssetsFileProvider apk, FilePatch patch)
{
string binaryFile = patch.Filename;
if (!apk.FileExists(binaryFile))
{
Console.WriteLine("Binary file to patch doesn't exist in the APK!");
return(false);
}
byte[] binaryBytes = apk.Read(binaryFile);
if (binaryBytes.Length != patch.ExpectedFileSize)
{
Console.WriteLine("Binary file to patch is the wrong length!");
return(false);
}
List <Patch> toApply = new List <Patch>();
Console.WriteLine("Verifying patches binary...");
using (MemoryStream msBinary = new MemoryStream(binaryBytes))
{
//verify each of the patches can be applied or already are applied
foreach (Patch p in patch.Patches)
{
msBinary.Seek(p.Address, SeekOrigin.Begin);
byte[] readVals = new byte[p.ExpectedData.Count];
msBinary.Read(readVals, 0, p.ExpectedData.Count);
if (!readVals.SequenceEqual(p.ExpectedData))
{
msBinary.Seek(p.Address, SeekOrigin.Begin);
readVals = new byte[p.PatchData.Count];
msBinary.Read(readVals, 0, p.PatchData.Count);
if (readVals.SequenceEqual(p.PatchData))
{
Console.WriteLine($"Patch {p.Name} already appears to be applied.");
continue;
}
else
{
Console.WriteLine($"Patch {p.Name} can't be applied to this binary, the code at the patch location doesn't match what was expected. Aborting any patching...");
//if one patch can't be applied, abort the whole thing
return(false);
}
}
}
foreach (Patch p in toApply)
{
msBinary.Seek(p.Address, SeekOrigin.Begin);
msBinary.Write(p.PatchData.ToArray(), 0, p.PatchData.Count);
}
msBinary.Seek(0, SeekOrigin.Begin);
apk.Write(binaryFile, msBinary.ToArray(), true, true);
}
Console.WriteLine("Done patching binary!");
return(true);
}