85 lines
3.4 KiB
C#
85 lines
3.4 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using System.IO.Compression;
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using System.Security.Cryptography;
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namespace Helpers
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{
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public class InstallerHelper
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{
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public static MemoryStream CreateInstaller(string wadFile, byte iosToUse)
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{
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const int injectionPosition = 0x85338;
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//1. Open the stub installer from resources
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MemoryStream compressedStubInstallerStream = LoadCompressedStubInstaller("CrapInstaller.dol.z");
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compressedStubInstallerStream.Seek(0, SeekOrigin.Begin);
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//2. Decompress compressed installer
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MemoryStream uncompressedStubInstallerStream = new MemoryStream();
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using (GZipStream gzipStream = new GZipStream(compressedStubInstallerStream, CompressionMode.Decompress))
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{
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byte[] decompressedBuff = new byte[1024];
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while (true)
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{
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int length = gzipStream.Read(decompressedBuff, 0, 1024);
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if (length == 0) break;
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uncompressedStubInstallerStream.Write(decompressedBuff, 0, length);
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}
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}
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//3. Take SHA of the wad and store it in the stub installer along with the size of the wad
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byte[] wadFileBytes = File.ReadAllBytes(wadFile);
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uint wadLength = (uint) wadFileBytes.Length;
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byte[] shaHash;
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using (SHA1 shaGen = SHA1.Create())
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{
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shaHash = shaGen.ComputeHash(wadFileBytes);
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}
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//4. Inject the data into the installer
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//Write out the wad size
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uncompressedStubInstallerStream.Seek(injectionPosition, SeekOrigin.Begin);
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uncompressedStubInstallerStream.WriteByte((byte)((wadLength >> 24) & 0xff));
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uncompressedStubInstallerStream.WriteByte((byte)((wadLength >> 16) & 0xff));
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uncompressedStubInstallerStream.WriteByte((byte)((wadLength >> 8) & 0xff));
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uncompressedStubInstallerStream.WriteByte((byte)(wadLength & 0xff));
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//Write out the SHA1 value (Against corruption of the file on the network, this value will be checked by the installer)
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uncompressedStubInstallerStream.Write(shaHash, 0, 20);
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//Write out the ios to be used...
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uncompressedStubInstallerStream.WriteByte(iosToUse);
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//pad it with three zeroes (to align it into 32-bit)
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uncompressedStubInstallerStream.WriteByte(0); uncompressedStubInstallerStream.WriteByte(0); uncompressedStubInstallerStream.WriteByte(0);
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//Write out to be installed wad file's contents...
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uncompressedStubInstallerStream.Write(wadFileBytes, 0, (int)wadLength);
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return uncompressedStubInstallerStream;
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}
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private static MemoryStream LoadCompressedStubInstaller(string installerResourceName)
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{
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using (BinaryReader resLoader = new BinaryReader(System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("Helpers.Resources." + installerResourceName)))
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{
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MemoryStream ms = new MemoryStream();
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byte[] temp = resLoader.ReadBytes((int)resLoader.BaseStream.Length);
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ms.Write(temp, 0, temp.Length);
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return ms;
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}
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}
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}
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}
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