[w1tcherrr]

• Paths are normalized the way the engine does it: \ and / are separators, empty and . segments are dropped, x/.. is resolved, ASCII letters are lowercased and the type is split at the last dot. FindEntry normalizes the same way. Adding refuses paths that can't hold a file: a trailing separator, .. above the root, an empty name or one ending in a dot, and names over the tree's length limits (NormalizeEntryPath, NormalizeDirectoryPath, public ParseEntryPath, PathComparer).
• New RenameDirectory, RemoveDirectory and RequiresRepack. Like AddFile and RenameFile, they don't check for duplicates.
• Repacking a package without chunk files into a _dir.vpk moves its data into chunk files.
• Zero-length entries are written at the data offset like Valve's packer does.
• New FilePath, HasChunkFiles, chunk file paths, EnumerateEntries, EntryCount, size limit constants and OpenArchiveStream.
• Open and OpenPackage read a package inside another package in place, at any depth.
• Verify checks the signature, the checksums, the chunk hashes, and the CRCs of entries no hash covers.
• Unchanged from before: leftover chunk files are deleted when writing a new package.