/// <summary>
/// Patches the file segments in a stream.
/// </summary>
/// <param name="changes">The changes to make to the segments and their data.</param>
/// <param name="stream">The stream to write changes to.</param>
public static void PatchSegments(IEnumerable <SegmentChange> changes, IStream stream)
{
// Sort changes by their offsets
var changesByOffset = new SortedList <uint, SegmentChange>();
foreach (SegmentChange change in changes)
{
changesByOffset[change.OldOffset] = change;
}
// Now adjust each segment
foreach (SegmentChange change in changesByOffset.Values)
{
// Resize it if necessary
if (change.NewSize != change.OldSize)
{
if (change.ResizeAtEnd)
{
stream.SeekTo(change.NewOffset + change.OldSize);
}
else
{
stream.SeekTo(change.NewOffset);
}
StreamUtil.Insert(stream, change.NewSize - change.OldSize, 0);
}
// Patch its data
DataPatcher.PatchData(change.DataChanges, change.NewOffset, stream);
}
}
/// <summary>
/// Applies a patch to a cache file.
/// </summary>
/// <param name="patch">The patch to apply.</param>
/// <param name="cacheFile">The cache file to apply the patch to. After the patch is applied, it may have to be reloaded.</param>
/// <param name="stream">The stream to write changes to.</param>
public static void ApplyPatch(Patch patch, ICacheFile cacheFile, IStream stream)
{
if (patch.MapInternalName != cacheFile.InternalName)
{
throw new ArgumentException("The patch is for a different cache file. Expected \"" + patch.MapInternalName +
"\" but got \"" + cacheFile.InternalName + "\".");
}
SegmentPatcher.PatchSegments(patch.SegmentChanges, stream);
#region Deprecated
DataPatcher.PatchData(patch.MetaChanges, (uint)-cacheFile.MetaArea.PointerMask, stream);
if (patch.LanguageChanges.Count > 0)
{
LocalePatcher.WriteLanguageChanges(patch.LanguageChanges, cacheFile, stream);
cacheFile.SaveChanges(stream);
}
#endregion
}