MemoryRange.java

/*
  MemoryRange.java

  (c) 2009-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.gui.client.swt.shells.debugger;

import v9t9.common.memory.IMemory;
import v9t9.common.memory.IMemoryDomain;
import v9t9.common.memory.IMemoryEntry;

/**
 * A range of viewable memory
 * @author ejs
 *
 */
public class MemoryRange {
	final IMemoryEntry entry;
	final int addr;
	final int len;
	
	public MemoryRange(IMemoryEntry entry, int addr, int len) {
		this.entry = entry;
		int lo = addr;
		int hi = addr + len;
		if (entry.getAddr() > lo)
			lo = entry.getAddr();
		if (entry.getAddr() + entry.getSize() < hi)
			hi = entry.getAddr() + entry.getSize() - lo; 
		this.addr = lo;
		this.len = hi - lo;
	}
	public MemoryRange(IMemoryEntry element) {
		this.entry = element;
		this.addr = element.getAddr();
		this.len = element.getSize();
	}
	public boolean contains(IMemoryEntry entry, int addr) {
		return this.entry.getDomain() == entry.getDomain() &&
			this.entry.contains(addr) &&
			addr >= this.addr && addr < this.addr + this.len;
	}
	public boolean isWordMemory() {
		return entry.isWordAccess();
	}
	
	public int getAddress() {
		return addr;
	}
	public int readByte(int addr) {
		if (addr >= this.addr && addr < this.addr + this.len)
			return entry.flatReadByte(addr);
		else
			return 0;
	}
	public void writeByte(int addr, byte byt) {
		if (addr >= this.addr && addr < this.addr + this.len)
			entry.writeByte(addr, byt);	
	}
	
	public int getSize() {
		return len;
	}
	/**
	 * @param i  
	 */
	public boolean canModify(int i) {
		return entry.hasWriteAccess();
	}
	public IMemoryEntry getEntry() {
		return entry;
	}
	
	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return entry.getDomain().getIdentifier() + "|" + addr + "|" + len;
	}
	/**
	 * @param range
	 * @return
	 */
	public static MemoryRange fromString(IMemory memory, String range) {
		if (range == null)
			return null;
		String[] parts = range.split("\\|");
		if (parts.length != 3)
			return null;
		IMemoryDomain domain = memory.getDomain(parts[0]);
		if (domain == null)
			return null;
		try {
			int addr = Integer.parseInt(parts[1]);
			int len = Integer.parseInt(parts[2]);
			IMemoryEntry entry = domain.getEntryAt(addr);
			if (entry == null)
				return null;
			return new MemoryRange(entry, addr, len);
		} catch (NumberFormatException e) {
			return null;
		}
	}
	
}