proc pckStart(self: PCKPacker; pckName: string; alignment: int64): Error {.
gcsafe,
    locks: 0, raises: [], tags: []
.}

proc addFile(self: PCKPacker; pckPath: string; sourcePath: string): Error {.
gcsafe,
    locks: 0, raises: [], tags: []
.}

proc flush(self: PCKPacker; verbose: bool): Error {.
gcsafe, locks: 0, raises: [], tags: []
.}