141 lines
2.6 KiB
Java
141 lines
2.6 KiB
Java
/*
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* Msf.java
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*
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* Copyright (c) 2007 Vreixo Formoso
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* See COPYING file for details.
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*/
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package org.pykix.libburnia.libburn;
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/**
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* Represent a minute-second-frame (MSF) address.
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*
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* @author Vreixo Formoso
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* @since 0.1
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*/
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/*
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* Due its simplicity, the functions here are implemented in pure Java,
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* without really wrapping underlying libburn C functions.
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*/
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public class Msf {
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/*
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* I make this vars public, maybe a get/set would be a better option.
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*/
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/** Minute component. */
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public int m;
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/** Second component. */
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public int s;
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/** Frame component. */
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public int f;
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public Msf(int m, int s, int f) {
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super();
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this.m = m;
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this.s = s;
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this.f = f;
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}
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/**
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* Get the sector count for this MSF.
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*/
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public int getSectors() {
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return msf2Sectors(m, s, f);
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}
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/**
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* Get the lba for this MSF.
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*/
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public int getLba() {
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return msf2Lba(m, s, f);
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}
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/**
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* Convert a minute-second-frame (MSF) value to sector count.
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*
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* @param m
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* Minute component.
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* @param s
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* Second component.
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* @param f
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* Frame component.
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* @return
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* The sector count.
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*/
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public static int msf2Sectors(int m, int s, int f) {
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return (m * 60 + s) * 75 + f;
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}
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/**
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* Convert a sector count to minute-second-frame (MSF).
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*
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* @param sectors
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* The sector count.
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* @return
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* The MSF.
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*/
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public static Msf sectors2Msf(int sectors) {
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int m = sectors / (60 * 75);
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int s = (sectors - m * 60 * 75) / 75;
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int f = sectors - m * 60 * 75 - s * 75;
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return new Msf(m, s, f);
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}
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/**
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* Convert a minute-second-frame (MSF) value to a lba.
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*
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* @param m
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* Minute component.
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* @param s
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* Second component.
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* @param f
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* Frame component.
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* @return
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* The lba.
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*/
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public static int msf2Lba(int m, int s, int f) {
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if (m < 90)
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return (m * 60 + s) * 75 + f - 150;
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else
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return (m * 60 + s) * 75 + f - 450150;
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}
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/**
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* Convert an lba to minute-second-frame (MSF).
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*
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* @param lba
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* The lba.
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* @return
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* The MSF.
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*/
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public static Msf lba2Msf(int lba) {
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int m, s, f;
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if (lba >= -150) {
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m = (lba + 150) / (60 * 75);
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s = (lba + 150 - m * 60 * 75) / 75;
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f = lba + 150 - m * 60 * 75 - s * 75;
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} else {
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m = (lba + 450150) / (60 * 75);
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s = (lba + 450150 - m * 60 * 75) / 75;
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f = lba + 450150 - m * 60 * 75 - s * 75;
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}
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return new Msf(m, s, f);
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}
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}
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