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//
// Copyright (C) 2010 Wayne Meissner
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
package jnr.x86asm;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
*
*/
final class CodeBuffer {
private ByteBuffer buf;
public CodeBuffer() {
buf = ByteBuffer.allocate(128).order(ByteOrder.LITTLE_ENDIAN);
}
public final void ensureSpace() {
if (buf.remaining() < 16) {
grow();
}
}
public void grow() {
int newSize = buf.capacity() * 2;
ByteBuffer newBuffer = ByteBuffer.allocate(newSize).order(ByteOrder.LITTLE_ENDIAN);
// Copy the data over
buf.flip();
newBuffer.put(buf);
buf = newBuffer;
}
final void copyTo(ByteBuffer dst) {
ByteBuffer dup = buf.duplicate();
dup.flip();
dst.put(dup);
}
public final int offset() {
return buf.position();
}
public int capacity() {
return buf.capacity();
}
public final void emitByte(byte x) {
buf.put(x);
}
public final void emitWord(short x) {
buf.putShort(x);
}
public final void emitDWord(int x) {
buf.putInt(x);
}
public final void emitQWord(long x) {
buf.putLong(x);
}
public final void emitData(ByteBuffer data, int len) {
ByteBuffer dup = data.duplicate();
if (dup.remaining() > len) {
dup.limit(dup.position() + len);
}
buf.put(dup);
}
public final byte getByteAt(int pos) {
return buf.get(pos);
}
public final short getWordAt(int pos) {
return buf.getShort(pos);
}
public final int getDWordAt(int pos) {
return buf.getInt(pos);
}
public final long getQWordAt(int pos) {
return buf.getLong(pos);
}
public final void setByteAt(int pos, byte x) {
buf.put(pos, x);
}
public final void setWordAt(int pos, short x) {
buf.putShort(pos, x);
}
public final void setDWordAt(int pos, int x) {
buf.putInt(pos, x);
}
public final void setQWordAt(int pos, long x) {
buf.putLong(pos, x);
}
}