Function copyFile

index/write.go:232–238

(dst, src *bufWriter)

}

func copyFile(dst, src *bufWriter) {
	dst.flush()
	_, err := io.Copy(dst.file, src.finish())
	if err != nil {
		log.Fatalf("copying %s to %s: %v", src.name, dst.name, err)
	}
}

// addName adds the file with the given name to the index.
// It returns the assigned file ID number.