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public class BufferBlock {
        private long startAddress;
        private byte[] bytes;
        private int size;
        private BufferBlock prev;
        private BufferBlock next;
        private boolean dirtyBit;
        
        public BufferBlock(int sz) {
                setStartAddress(-1);
                bytes = new byte[sz];
                this.size = sz;
                prev = null;
                next = null;
                setDirtyBit(false);
        }
        
        // Copies size bytes starting from address to out
        public void getBytes(byte[] out, int address, int size) {
                for (int i = 0; i < size; i++) {
                        out[i] = bytes[address + i];
                }
        }
        
        // Puts size bytes starting from address from in
        public void setBytes(byte[] in, int address, int size) {
                for (int i = 0; i < size; i++) {
                        bytes[address + i] = in[i]; 
                }
        }
        
        public BufferBlock getPrev() {
                return prev;
        }
        public void setPrev(BufferBlock prev) {
                this.prev = prev;
        }
        public BufferBlock getNext() {
                return next;
        }
        public void setNext(BufferBlock next) {
                this.next = next;
        }
        public int getSize() {
                return size;
        }
        public boolean isDirtyBit() {
                return dirtyBit;
        }
        public void setDirtyBit(boolean dirtyBit) {
                this.dirtyBit = dirtyBit;
        }
        public long getStartAddress() {
                return startAddress;
        }
        public void setStartAddress(long startAddress) {
                this.startAddress = startAddress;
        }
}