customizemii/Helpers/InstallerHelper.cs
imruon@gmail.com b7770f8861 Splash Image changed, installer now working fine
git-svn-id: svn://localhost/Users/andi/Downloads/code/trunk@23 eddbe33b-e435-4246-ac25-f5eb65f9a13c
2010-01-10 18:38:07 +00:00

85 lines
3.4 KiB
C#

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.IO.Compression;
using System.Security.Cryptography;
namespace Helpers
{
public class InstallerHelper
{
public static MemoryStream CreateInstaller(string wadFile, byte iosToUse)
{
const int injectionPosition = 0x5A78C;
//1. Open the stub installer from resources
MemoryStream compressedStubInstallerStream = LoadCompressedStubInstaller("CustomizeMiiInstaller.dol.z");
compressedStubInstallerStream.Seek(0, SeekOrigin.Begin);
//2. Decompress compressed installer
MemoryStream uncompressedStubInstallerStream = new MemoryStream();
using (GZipStream gzipStream = new GZipStream(compressedStubInstallerStream, CompressionMode.Decompress))
{
byte[] decompressedBuff = new byte[1024];
while (true)
{
int length = gzipStream.Read(decompressedBuff, 0, 1024);
if (length == 0) break;
uncompressedStubInstallerStream.Write(decompressedBuff, 0, length);
}
}
//3. Take SHA of the wad and store it in the stub installer along with the size of the wad
byte[] wadFileBytes = File.ReadAllBytes(wadFile);
uint wadLength = (uint) wadFileBytes.Length;
byte[] shaHash;
using (SHA1 shaGen = SHA1.Create())
{
shaHash = shaGen.ComputeHash(wadFileBytes);
}
//4. Inject the data into the installer
//Write out the wad size
uncompressedStubInstallerStream.Seek(injectionPosition, SeekOrigin.Begin);
uncompressedStubInstallerStream.WriteByte((byte)((wadLength >> 24) & 0xff));
uncompressedStubInstallerStream.WriteByte((byte)((wadLength >> 16) & 0xff));
uncompressedStubInstallerStream.WriteByte((byte)((wadLength >> 8) & 0xff));
uncompressedStubInstallerStream.WriteByte((byte)(wadLength & 0xff));
//Write out the SHA1 value (Against corruption of the file on the network, this value will be checked by the installer)
uncompressedStubInstallerStream.Write(shaHash, 0, 20);
//Write out the ios to be used...
uncompressedStubInstallerStream.WriteByte(iosToUse);
//pad it with three zeroes (to align it into 32-bit)
uncompressedStubInstallerStream.WriteByte(0); uncompressedStubInstallerStream.WriteByte(0); uncompressedStubInstallerStream.WriteByte(0);
//Write out to be installed wad file's contents...
uncompressedStubInstallerStream.Write(wadFileBytes, 0, (int)wadLength);
return uncompressedStubInstallerStream;
}
private static MemoryStream LoadCompressedStubInstaller(string installerResourceName)
{
using (BinaryReader resLoader = new BinaryReader(System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("Helpers.Resources." + installerResourceName)))
{
MemoryStream ms = new MemoryStream();
byte[] temp = resLoader.ReadBytes((int)resLoader.BaseStream.Length);
ms.Write(temp, 0, temp.Length);
return ms;
}
}
}
}