readers

type Arch struct {
	Mime    string // archive.ExtTar|ExtTgz|ExtTarGz|ExtZip|ExtTarLz4
	Prefix  string // optional prefix inside archive (e.g., "trunk-", "a/b/c/trunk-")
	MinSize int64  // min file size
	MaxSize int64  // max file size
	Seed    uint64 // optional seed for random works (otherwise, using mono-time)
	Num     int    // files per shard
	//
	// advanced options - each and every one can be omitted
	//
	Names     []string   // explicit in-archive names
	RecExt    string     // default ".txt"; see also extended comment below
	TarFormat tar.Format // to override cmn/archive default
	MaxLayers int        // upper bound for RandDir; default 5
	RandNames bool       // generate numeric-random names
	RandDir   bool       // add random dir layers
	// contains filtered or unexported fields
}

type Arg struct {
	SGL        *memsys.SGL // when Type == "sg"
	Arch       *Arch       // when the content is archive
	Type       string      // "file" | "sg" | "inmem" | "rand"
	Path, Name string      // when Type == "file"; path and name of file to be created if doesn't exist
	CksumType  string
	Size       int64
}

type Reader interface {
	cos.ReadOpenCloser
	io.Seeker
	Reset()
	Cksum() *cos.Cksum
}