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type Block struct {
	Offset int64
	Size   uint32
	Hash   []byte
}

type File struct {
	Name     string
	Flags    uint32
	Modified int64
	Version  uint32
	Size     int64
	Blocks   []Block
}

type Suppressor interface {
	// Supress returns true if the update to the named file should be ignored.
	Suppress(name string, fi os.FileInfo) bool
}

type TempNamer interface {
	// Temporary returns a temporary name for the filed referred to by path.
	TempName(path string) string
	// IsTemporary returns true if path refers to the name of temporary file.
	IsTemporary(path string) bool
}

type Walker struct {
	// Dir is the base directory for the walk
	Dir string
	// If FollowSymlinks is true, symbolic links directly under Dir will be followed.
	// Symbolic links at deeper levels are never followed regardless of this flag.
	FollowSymlinks bool
	// BlockSize controls the size of the block used when hashing.
	BlockSize int
	// If IgnoreFile is not empty, it is the name used for the file that holds ignore patterns.
	IgnoreFile string
	// If TempNamer is not nil, it is used to ignore tempory files when walking.
	TempNamer TempNamer
	// If Suppressor is not nil, it is queried for supression of modified files.
	Suppressor Suppressor
	// contains filtered or unexported fields
}