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The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.
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package it.unimi.dsi.io;

/*
 * DSI utilities
 *
 * Copyright (C) 2006-2019 Sebastiano Vigna
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 *
 */

import it.unimi.dsi.lang.MutableString;

import java.io.IOException;
import java.io.PrintStream;


/** A debugging wrapper for input bit streams.
 *
 * This class can be used to wrap an input bit stream. The semantics of the
 * resulting read operations is unchanged, but each operation will be logged. The
 * conventions are the same as those of {@link it.unimi.dsi.io.DebugOutputBitStream},
 * with the following additions:
 *
 * 

 * !
 * 
{@link InputBitStream#reset() reset()};
 * 
+>
 * 
{@link InputBitStream#skip(long) skip()}.
 * 
 *
 * @author Sebastiano Vigna
 * @since 1.1
 */

public class DebugInputBitStream extends InputBitStream {

	private final PrintStream pw;
	private final InputBitStream ibs;

	/** Creates a new debug input bit stream wrapping a given input bit stream and logging on a given writer.
	 *
	 * @param ibs the input bit stream to wrap.
	 * @param pw a print stream that will receive the logging data.
	 */
	public DebugInputBitStream(final InputBitStream ibs, final PrintStream pw) {
		this.ibs = ibs;
		this.pw = pw;
		pw.print("[");
	}

	/** Creates a new debug input bit stream wrapping a given input bit stream and logging on standard error.
	 *
	 * @param ibs the input bit stream to wrap.
	 */
	public DebugInputBitStream(final InputBitStream ibs) {
		this(ibs, System.err);
	}


	@Override
	public void align() {
		pw.print(" |");
		ibs.align();
	}

	@Override
	public long available() throws IOException {
		return ibs.available();
	}

	@Override
	public void close() throws IOException {
		pw.print(" |]");
		ibs.close();
	}

	@Override
	public void flush() {
		pw.print(" |");
		ibs.flush();
	}

	@Override
	public void position(long position) throws IOException {
		pw.print(" ->" + position);
		ibs.position(position);
	}

	@Override
	public void read(byte[] bits, int len) throws IOException {
		ibs.read(bits, len);
		MutableString s = new MutableString(" {");
		for(int i = 0; i < bits.length; i++) s.append(DebugOutputBitStream.byte2Binary(bits[i]));
		pw.print(s.length(len).append("}"));
	}

	@Override
	public int readBit() throws IOException {
		final int bit = ibs.readBit();
		pw.print(" {" + bit + "}");
		return bit;
	}

	@Override
	public long readBits() {
		return ibs.readBits();
	}

	@Override
	public void readBits(long readBits) {
		ibs.readBits(readBits);
	}

	@Override
	public int readDelta() throws IOException {
		final int x = ibs.readDelta();
		pw.print(" {d:" + x + "}");
		return x;
	}

	@Override
	public int readGamma() throws IOException {
		final int x = ibs.readGamma();
		pw.print(" {g:" + x + "}");
		return x;
	}

	@Override
	public int readGolomb(int b, int log2b) throws IOException {
		final int x = ibs.readGolomb(b, log2b);
		pw.print(" {G:" + x + ":" + b + "}");
		return x;
	}

	@Override
	public int readGolomb(int b) throws IOException {
		final int x = ibs.readGolomb(b);
		pw.print(" {G:" + x + ":" + b + "}");
		return x;
	}

	@Override
	public int readInt(int len) throws IOException {
		final int x = ibs.readInt(len);
		pw.print(" {" + DebugOutputBitStream.int2Binary(x, len) + "}");
		return x;
	}

	@Override
	public long readLong(int len) throws IOException {
		final long x = ibs.readLong(len);
		pw.print(" {" + DebugOutputBitStream.int2Binary(x, len) + "}");
		return x;
	}

	@Override
	public long readLongDelta() throws IOException {
		final long x = ibs.readLongDelta();
		pw.print(" {d:" + x + "}");
		return x;
	}

	@Override
	public long readLongGamma() throws IOException {
		final long x = ibs.readLongGamma();
		pw.print(" {g:" + x + "}");
		return x;
	}

	@Override
	public long readLongGolomb(long b, int log2b) throws IOException {
		final long x = ibs.readLongGolomb(b, log2b);
		pw.print(" {G:" + x + ":" + b + "}");
		return x;
	}

	@Override
	public long readLongGolomb(long b) throws IOException {
		final long x = ibs.readLongGolomb(b);
		pw.print(" {G:" + x + ":" + b + "}");
		return x;
	}

	@Override
	public long readLongMinimalBinary(long b, int log2b) throws IOException {
		final long x = ibs.readLongMinimalBinary(b, log2b);
		pw.print(" {m:" + x + "<" + b + "}");
		return x;
	}

	@Override
	public long readLongMinimalBinary(long b) throws IOException {
		final long x = ibs.readLongMinimalBinary(b);
		pw.print(" {m:" + x + "<" + b + "}");
		return x;
	}

	@Override
	public long readLongNibble() throws IOException {
		final long x = ibs.readLongNibble();
		pw.print(" {N:" + x + "}");
		return x;
	}

	@Override
	public long readLongSkewedGolomb(long b) throws IOException {
		final long x = ibs.readLongSkewedGolomb(b);
		pw.print(" {SG:" + x + ":" + b + "}");
		return x;
	}

	@Override
	public long readLongUnary() throws IOException {
		final long x = ibs.readLongUnary();
		pw.print(" {U:" + x + "}");
		return x;
	}

	@Override
	public long readLongZeta(int k) throws IOException {
		final long x = ibs.readLongZeta(k);
		pw.print(" {z" + k + ":" + x + "}");
		return x;
	}

	@Override
	public int readMinimalBinary(int b, int log2b) throws IOException {
		final int x = ibs.readMinimalBinary(b, log2b);
		pw.print(" {m:" + x + "<" + b + "}");
		return x;

	}

	@Override
	public int readMinimalBinary(int b) throws IOException {
		final int x = ibs.readMinimalBinary(b);
		pw.print(" {m:" + x + "<" + b + "}");
		return x;
	}

	@Override
	public int readNibble() throws IOException {
		final int x = ibs.readNibble();
		pw.print(" {N:" + x + "}");
		return x;
	}

	@Override
	public int readSkewedGolomb(int b) throws IOException {
		final int x = ibs.readSkewedGolomb(b);
		pw.print(" {SG:" + x + ":" + b + "}");
		return x;
	}

	@Override
	public int readUnary() throws IOException {
		final int x = ibs.readUnary();
		pw.print(" {U:" + x + "}");
		return x;
	}

	@Override
	public int readZeta(int k) throws IOException {
		final int x = ibs.readZeta(k);
		pw.print(" {z" + k + ":" + x + "}");
		return x;
	}

	@Override
	public void reset() throws IOException {
		pw.print(" {!}");
		ibs.reset();
	}

	@Override
	@Deprecated
	public int skip(int n) {
		pw.print(" {+>" + n + "}");
		return ibs.skip(n);
	}

	@Override
	public long skip(long n) throws IOException {
		pw.print(" {+>" + n + "}");
		return ibs.skip(n);
	}

}