NXPatcher - Create your own pre-patcher & list of Maple FTPs

I need to learn C# for work, and what better way to do that than to fix NXPatcher?

Currently I'm working on NXPatcher Advanced. Here are the following features I'm adding:

- Complete rewrite in a different language.
- Patching DLL created in C# to allow others to do whatever they want to with patch files.
- NXPatcher logic and patch logic are now separate.
- No more running out of realloc space. The C# garbage collector will use swap space instead of running out of RAM.

I do not plan on rewriting NXPatcher Lite because it already does everything I need it to do.

Here's an example of the code I'm working with to apply a patch file to a directory.

Code:

namespace NXPatcherCS
{
    class Program
    {
        static void Main(string[] args)
        {
            var accessor = new PatchAccessor(@"H:\Maplestory\GMS\00155to00159.patch");
            accessor.ValidateCRC();

            // DumpDeflateStream returns an emitter, which is a dumb, low level accessor for the unpacked patch file. It only fetches the bytes and doesn't do any interpretation.
            var dumpPatchEmitter = accessor.DumpDeflateStream();

            // Setup where the dump file is, where all of the original files are, and where all of the new files will go.
            var dirName = Path.GetDirectoryName(dumpPath);
            var outDir = Path.Combine(dirName, "patcher");

            // Let's patch, baby!
            var dpa = new DumpPatchApplier(dumpPatchEmitter, dirName, outDir);
            dpa.ApplyPatch();
        }
    }
}

I tested this code on a 600 MB patch file. While there was a performance penalty for using C# instead of C/C++, at least it will patch now. For some reason, my algorithm soaks up RAM worse than Chrome when patching sound.wz. I will need to profile my code to figure out what's taking up gobs of RAM.

Already written features:
- Access patches, check CRCs/headers, and dump the patch file
- Read the dumped patch files
- Apply the dumped patch files
- Accessor for patch EXE files
- Writer for patch EXE files

Still need to write:
- NXPatcher Advanced logic
- WZ version checking