}

// logicalRemaining implements fileState.logicalRemaining.
func (fw regFileWriter) logicalRemaining() int64 {
	return fw.nb
}

// physicalRemaining implements fileState.physicalRemaining.
func (fw regFileWriter) physicalRemaining() int64 {
	return fw.nb
}

// sparseFileWriter is a fileWriter for writing data to a sparse file entry.
type sparseFileWriter struct {

}

// logicalRemaining implements fileState.logicalRemaining.
func (fr regFileReader) logicalRemaining() int64 {
	return fr.nb
}

// physicalRemaining implements fileState.physicalRemaining.
func (fr regFileReader) physicalRemaining() int64 {
	return fr.nb
}

// sparseFileReader is a fileReader for reading data from a sparse file entry.
type sparseFileReader struct {

				if got := fw.logicalRemaining(); got != tf.wantLCnt {
					t.Errorf("test %d.%d, logicalRemaining() = %d, want %d", i, j, got, tf.wantLCnt)
				}
				if got := fw.physicalRemaining(); got != tf.wantPCnt {
					t.Errorf("test %d.%d, physicalRemaining() = %d, want %d", i, j, got, tf.wantPCnt)
				}
			default:
				t.Fatalf("test %d.%d, unknown test operation: %T", i, j, tf)
			}
		}

				if got := fr.logicalRemaining(); got != tf.wantLCnt {
					t.Errorf("test %d.%d, logicalRemaining() = %d, want %d", i, j, got, tf.wantLCnt)
				}
				if got := fr.physicalRemaining(); got != tf.wantPCnt {
					t.Errorf("test %d.%d, physicalRemaining() = %d, want %d", i, j, got, tf.wantPCnt)
				}
			default:
				t.Fatalf("test %d.%d, unknown test operation: %T", i, j, tf)
			}
		}
	}
}

// fileState tracks the number of logical (includes sparse holes) and physical
// (actual in tar archive) bytes remaining for the current file.
//
// Invariant: logicalRemaining >= physicalRemaining
type fileState interface {
	logicalRemaining() int64
	physicalRemaining() int64
}

// allowedFormats determines which formats can be used.
// The value returned is the logical OR of multiple possible formats.