/*
 * Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
/*
 ******************************************************************************
 * Copyright (C) 2003, International Business Machines Corporation and   *
 * others. All Rights Reserved.                                               *
 ******************************************************************************
 *
 * Created on May 2, 2003
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
// CHANGELOG
//      2005-05-19 Edward Wang
//          - copy this file from icu4jsrc_3_2/src/com/ibm/icu/impl/StringPrepDataReader.java
//          - move from package com.ibm.icu.impl to package sun.net.idn
//
package jdk_internal.icu.impl;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author ram
 *
 *         To change the template for this generated type comment go to
 *         Window>Preferences>Java>Code Generation>Code and Comments
 */
public final class StringPrepDataReader implements ICUBinary.Authenticate {

	/**
	 * File format version that this class understands. No guarantees are made if a
	 * older version is used see store.c of gennorm for more information and values
	 */
	/// * dataFormat="SPRP" 0x53, 0x50, 0x52, 0x50 */
	private static final byte DATA_FORMAT_ID[] = { (byte) 0x53, (byte) 0x50, (byte) 0x52, (byte) 0x50 };

	private static final byte DATA_FORMAT_VERSION[] = { (byte) 0x3, (byte) 0x2, (byte) 0x5, (byte) 0x2 };

	/**
	 * ICU data file input stream
	 */
	private DataInputStream dataInputStream;

	private byte[] unicodeVersion;

	/**
	 * <p>
	 * private constructor.
	 * </p>
	 *
	 * @param inputStream ICU uprop.dat file input stream
	 * @exception IOException throw if data file fails authentication
	 * @draft 2.1
	 */
	public StringPrepDataReader(InputStream inputStream) throws IOException {

		unicodeVersion = ICUBinary.readHeader(inputStream, DATA_FORMAT_ID, this);

		dataInputStream = new DataInputStream(inputStream);

	}

	public byte[] getDataFormatVersion() {
		return DATA_FORMAT_VERSION;
	}

	public byte[] getUnicodeVersion() {
		return unicodeVersion;
	}

	// private data members -------------------------------------------------
	@Override
	public boolean isDataVersionAcceptable(byte version[]) {
		return version[0] == DATA_FORMAT_VERSION[0] && version[2] == DATA_FORMAT_VERSION[2]
				&& version[3] == DATA_FORMAT_VERSION[3];
	}

	public void read(byte[] idnaBytes, char[] mappingTable) throws IOException {

		// Read the bytes that make up the idnaTrie
		dataInputStream.read(idnaBytes);

		// Read the extra data
		for (int i = 0; i < mappingTable.length; i++) {
			mappingTable[i] = dataInputStream.readChar();
		}
	}

	public int[] readIndexes(int length) throws IOException {
		int[] indexes = new int[length];
		// Read the indexes
		for (int i = 0; i < length; i++) {
			indexes[i] = dataInputStream.readInt();
		}
		return indexes;
	}

}
