/// <summary>
/// Decodes buffer.
/// </summary>
/// <param name="buffer"></param>
/// <param name="seed"></param>
private void Decode(ref byte[] buffer)
{
var mt = new MTRandom((uint)((this.Seed << 7) ^ 0xA9C36DE1));
for (int i = 0; i < buffer.Length; ++i)
{
buffer[i] = (byte)(buffer[i] ^ mt.GetUInt32());
}
}
/// <summary>
/// Decodes buffer.
/// </summary>
/// <param name="buffer"></param>
/// <param name="seed"></param>
private void Decode(ref byte[] buffer)
{
// KR beta (v1) didn't have encoding yet
if (this.Header.FormatVersion == 1)
{
return;
}
var mt = new MTRandom((this.Seed << 7) ^ 0xA9C36DE1);
for (var i = 0; i < buffer.Length; ++i)
{
buffer[i] = (byte)(buffer[i] ^ mt.GetUInt32());
}
}
/// <summary>
/// Writes pack file to given location.
/// </summary>
/// <param name="filePath"></param>
public void Save(string filePath, CompressionStrength compression = CompressionStrength.Default)
{
var blankLength = this.Header.BlankLength;
var fileCount = this.Count;
using (var fs = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None))
using (var bw = new BinaryWriter(fs))
{
var entryStarts = new Dictionary <IPackListEntry, long>();
// Header
bw.Write(this.Header.Signature);
bw.Write(this.Header.FormatVersion);
bw.Write(this.Header.PackVersion);
bw.Write(fileCount);
bw.Write(this.Header.FileTime1.ToFileTimeUtc());
bw.Write(this.Header.FileTime2.ToFileTimeUtc());
bw.Write(Encoding.UTF8.GetBytes(this.Header.BasePath.PadRight(480, '\0')));
bw.Write(fileCount);
var headerLengthsStart = bw.BaseStream.Position;
bw.Write(this.Header.ListLength);
bw.Write(blankLength);
bw.Write(this.Header.DataLength);
bw.Write(this.Header.Zero);
// List
var entryListStart = bw.BaseStream.Position;
foreach (var entry in _entries.Values)
{
bw.Write((byte)entry.NameType);
if (entry.NameType <= PackListNameType.L64)
{
var size = (0x10 * ((byte)entry.NameType + 1));
var bytes = Encoding.UTF8.GetBytes(entry.RelativePath.PadRight(size - 1, '\0'));
bw.Write(bytes);
}
else if (entry.NameType == PackListNameType.L96)
{
var size = 0x60;
var bytes = Encoding.UTF8.GetBytes(entry.RelativePath.PadRight(size - 1, '\0'));
bw.Write(bytes);
}
else if (entry.NameType == PackListNameType.LDyn)
{
var bytes = Encoding.UTF8.GetBytes(entry.RelativePath + '\0');
bw.Write(bytes.Length);
bw.Write(bytes);
}
else
{
throw new Exception("Unknown entry name type '" + entry.NameType + "'.");
}
bw.Write(entry.Seed);
bw.Write(entry.Zero);
entryStarts[entry] = bw.BaseStream.Position;
bw.Write(0); // DataOffset
bw.Write(0); // CompressedSize
bw.Write(0); // DecompressedSize
bw.Write(entry.IsCompressed ? 1 : 0);
bw.Write(entry.FileTime1.ToFileTimeUtc());
bw.Write(entry.FileTime2.ToFileTimeUtc());
bw.Write(entry.FileTime3.ToFileTimeUtc());
bw.Write(entry.FileTime4.ToFileTimeUtc());
bw.Write(entry.FileTime5.ToFileTimeUtc());
}
var entryListEnd = bw.BaseStream.Position;
var entryListLength = (int)(entryListEnd - entryListStart);
bw.Write(new byte[blankLength]);
// Data
var dataOffset = 0;
var dataListStart = bw.BaseStream.Position;
foreach (var entry in _entries.Values)
{
// Get data
var data = entry.GetData();
var uncompressedSize = data.Length;
if (entry.IsCompressed)
{
// Compress data
var dataStart = bw.BaseStream.Position;
byte[] compressed;
using (var ms = new MemoryStream())
{
var zlib = new ZOutputStream(ms, (int)compression);
zlib.Write(data, 0, data.Length);
zlib.finish();
compressed = ms.ToArray();
}
var mt = new MTRandom((entry.Seed << 7) ^ 0xA9C36DE1);
for (var i = 0; i < compressed.Length; ++i)
{
compressed[i] = (byte)(compressed[i] ^ mt.GetUInt32());
}
data = compressed;
}
bw.Write(data);
var dataEnd = bw.BaseStream.Position;
var compressedSize = data.Length;
var listPos = entryStarts[entry];
// Overwrite entry information
bw.BaseStream.Seek(listPos, SeekOrigin.Begin);
bw.Write(dataOffset);
bw.Write(compressedSize);
bw.Write(uncompressedSize);
bw.BaseStream.Seek(dataEnd, SeekOrigin.Begin);
dataOffset += compressedSize;
}
var dataListEnd = bw.BaseStream.Position;
var dataListLength = (int)(dataListEnd - dataListStart);
bw.BaseStream.Seek(headerLengthsStart, SeekOrigin.Begin);
bw.Write(entryListLength + blankLength);
bw.Seek(4, SeekOrigin.Current);
bw.Write(dataListLength);
bw.BaseStream.Seek(dataListEnd, SeekOrigin.Begin);
}
}
