mirror of https://github.com/badvision/jace.git
73 lines
2.2 KiB
Java
73 lines
2.2 KiB
Java
/*
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* Copyright (C) 2012 Brendan Robert (BLuRry) brendan.robert@gmail.com.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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package jace.hardware.massStorage;
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import java.io.IOException;
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/**
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* Maintain freespace and node allocation
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* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
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*/
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public class FreespaceBitmap extends DiskNode {
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int size = (ProdosVirtualDisk.MAX_BLOCK + 1) / 8 / ProdosVirtualDisk.BLOCK_SIZE;
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public FreespaceBitmap(ProdosVirtualDisk fs, int start) throws IOException {
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setBaseBlock(start);
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setOwnerFilesystem(fs);
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for (int i=1; i < size; i++) {
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new SubNode(i, this, start+i);
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}
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}
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@Override
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public void doDeallocate() {
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//
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}
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@Override
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public void doAllocate() {
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///
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}
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@Override
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public void doRefresh() {
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//
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}
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@Override
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public void readBlock(int sequence, byte[] buffer) throws IOException {
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int startBlock = sequence * ProdosVirtualDisk.BLOCK_SIZE * 8;
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int endBlock = (sequence+1)* ProdosVirtualDisk.BLOCK_SIZE * 8;
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int bitCounter=0;
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int pos=0;
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int value=0;
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for (int i=startBlock; i < endBlock; i++) {
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if (!getOwnerFilesystem().isAllocated(i)) {
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value++;
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}
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bitCounter++;
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if (bitCounter < 8) {
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value *= 2;
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} else {
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bitCounter = 0;
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buffer[pos++]=(byte) value;
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value = 0;
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}
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}
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}
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} |