package org.jpc.emulator.memory;
import org.jpc.emulator.execution.codeblock.*;
public abstract class AbstractMemory implements Memory
{
public void lock(int addr) {}
public void unlock(int addr) {}
public void addSpanningBlock(SpanningCodeBlock b, int lengthRemaining) {}
public abstract long getSize();
public abstract byte getByte(int offset);
public abstract void setByte(int offset, byte data);
public void clear()
{
for (int i=0; i<getSize(); i++)
setByte(i, (byte)0);
}
public void clear(int start, int length)
{
int limit = start + length;
if (limit > getSize()) throw new ArrayIndexOutOfBoundsException("Attempt to clear outside of memory bounds");
for (int i = start; i < limit; i++)
setByte(i, (byte)0);
}
public void copyContentsIntoArray(int address, byte[] buffer, int off, int len)
{
for (int i=off; i<off+len; i++, address++)
buffer[i] = getByte(address);
}
public void copyArrayIntoContents(int address, byte[] buffer, int off, int len)
{
for (int i=off; i<off+len; i++, address++)
setByte(address, buffer[i]);
}
/**
* Get little-endian word at <code>offset</code> by repeated calls to
* <code>getByte</code>.
* @param offset index of first byte of word.
* @return word at <code>offset</code> as a short.
*/
protected final short getWordInBytes(int offset)
{
int result = 0xFF & getByte(offset+1);
result <<= 8;
result |= (0xFF & getByte(offset));
return (short) result;
}
/**
* Get little-endian doubleword at <code>offset</code> by repeated calls to
* <code>getByte</code>.
* @param offset index of first byte of doubleword.
* @return doubleword at <code>offset</code> as an int.
*/
protected final int getDoubleWordInBytes(int offset)
{
int result = 0xFFFF & getWordInBytes(offset+2);
result <<= 16;
result |= (0xFFFF & getWordInBytes(offset));
return result;
}
/**
* Get little-endian quadword at <code>offset</code> by repeated calls to
* <code>getByte</code>.
* @param offset index of first byte of quadword.
* @return quadword at <code>offset</code> as a long.
*/
protected final long getQuadWordInBytes(int offset)
{
long result = 0xFFFFFFFFl & getDoubleWordInBytes(offset+4);
result <<= 32;
result |= (0xFFFFFFFFl & getDoubleWordInBytes(offset));
return result;
}
public short getWord(int offset)
{
return getWordInBytes(offset);
}
public int getDoubleWord(int offset)
{
return getDoubleWordInBytes(offset);
}
public long getQuadWord(int offset)
{
return getQuadWordInBytes(offset);
}
public long getLowerDoubleQuadWord(int offset)
{
return getQuadWordInBytes(offset);
}
public long getUpperDoubleQuadWord(int offset)
{
return getQuadWordInBytes(offset+8);
}
/**
* Set little-endian word at <code>offset</code> by repeated calls to
* <code>setByte</code>.
* @param offset index of first byte of word.
* @param data new value as a short.
*/
protected final void setWordInBytes(int offset, short data)
{
setByte(offset, (byte) data);
offset++;
setByte(offset, (byte) (data >> 8));
}
/**
* Set little-endian doubleword at <code>offset</code> by repeated calls to
* <code>setByte</code>.
* @param offset index of first byte of doubleword.
* @param data new value as an int.
*/
protected final void setDoubleWordInBytes(int offset, int data)
{
setByte(offset, (byte) data);
offset++;
data >>= 8;
setByte(offset, (byte) data);
offset++;
data >>= 8;
setByte(offset, (byte) data);
offset++;
data >>= 8;
setByte(offset, (byte) data);
}
/**
* Set little-endian quadword at <code>offset</code> by repeated calls to
* <code>setByte</code>.
* @param offset index of first byte of quadword.
* @param data new value as a long.
*/
protected final void setQuadWordInBytes(int offset, long data)
{
setDoubleWordInBytes(offset, (int) data);
setDoubleWordInBytes(offset+4, (int) (data >> 32));
}
public void setWord(int offset, short data)
{
setWordInBytes(offset, data);
}
public void setDoubleWord(int offset, int data)
{
setDoubleWordInBytes(offset, data);
}
public void setQuadWord(int offset, long data)
{
setQuadWordInBytes(offset, data);
}
public void setLowerDoubleQuadWord(int offset, long data)
{
setQuadWordInBytes(offset, data);
}
public void setUpperDoubleQuadWord(int offset, long data)
{
setQuadWordInBytes(offset+8, data);
}
// public static final short getWord(int offset, byte[] src)
// {
// return (short) ((0xFF & src[offset]) | (0xFF00 & (src[offset+1] << 8)));
// }
//
// public static final int getDoubleWord(int offset, byte[] src)
// {
// return (0xFFFF & getWord(offset, src)) | (0xFFFF0000 & (getWord(offset+2, src) << 16));
// }
/**
* Set all references in <code>target</code> to <code>value</code>.
* @param target array to be cleared.
* @param value new entry.
*/
public static final void clearArray(Object[] target, Object value)
{
if (target == null)
return;
for (int i=0; i<target.length; i++)
target[i] = value;
}
/**
* Set all bytes in <code>target</code> to <code>value</code>.
* @param target array to be cleared.
* @param value new byte value.
*/
public static final void clearArray(byte[] target, byte value)
{
if (target == null)
return;
for (int i=0; i<target.length; i++)
target[i] = value;
}
}