/// <summary>
/// Obtains a stream which can be used to read and write a cache file's meta in realtime.
/// The stream will be set up such that offsets in the stream correspond to meta pointers in the cache file.
/// </summary>
/// <param name="cacheFile">The cache file to get a stream for.</param>
/// <param name="tag">The tag to get a stream for.</param>
/// <returns>The stream if it was opened successfully, or null otherwise.</returns>
public IStream GetMetaStream(ICacheFile cacheFile, ITag tag)
{
Process gameProcess = FindGameProcess();
if (gameProcess == null)
return null;
var gameMemory = new ProcessMemoryStream(gameProcess);
var mapInfo = new H2VistaMapPointerReader(gameMemory);
long metaAddress;
if (cacheFile.Type != CacheFileType.Shared)
{
metaAddress = mapInfo.CurrentMetaAddress;
// The map isn't shared, so make sure the map names match
if (mapInfo.MapName != cacheFile.InternalName)
{
gameMemory.Close();
return null;
}
}
else
{
metaAddress = mapInfo.SharedMetaAddress;
// Make sure the shared and current map pointers are different,
// or that the current map is the shared map
if (mapInfo.MapType != CacheFileType.Shared && mapInfo.CurrentMetaAddress == mapInfo.SharedMetaAddress)
{
gameMemory.Close();
return null;
}
}
var metaStream = new OffsetStream(gameMemory, metaAddress - cacheFile.MetaArea.BasePointer);
return new EndianStream(metaStream, BitConverter.IsLittleEndian ? Endian.LittleEndian : Endian.BigEndian);
}
/// <summary>
/// Obtains a stream which can be used to read and write a cache file's meta in realtime.
/// The stream will be set up such that offsets in the stream correspond to meta pointers in the cache file.
/// </summary>
/// <param name="cacheFile">The cache file to get a stream for.</param>
/// <param name="tag">The tag to get a stream for.</param>
/// <returns>
/// The stream if it was opened successfully, or null otherwise.
/// </returns>
public IStream GetMetaStream(ICacheFile cacheFile, ITag tag)
{
// Open a handle to the game process
var gameProcess = FindGameProcess();
if (gameProcess == null)
return null;
var memoryStream = new ProcessMemoryStream(gameProcess);
var exeBase = (uint)memoryStream.BaseProcess.MainModule.BaseAddress - 0x400000;
var tagAddress = GetTagAddress(new EndianReader(memoryStream, Endian.LittleEndian), tag.Index.Index, exeBase);
if (tagAddress == 0)
{
memoryStream.Close();
return null;
}
var offsetStream = new OffsetStream(memoryStream, tagAddress - tag.HeaderLocation.AsOffset());
return new EndianStream(offsetStream, Endian.LittleEndian);
}