| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| |
| package org.apache.sysds.runtime.io.hdf5; |
| |
| import org.apache.commons.lang3.ArrayUtils; |
| import java.math.BigInteger; |
| import java.nio.ByteBuffer; |
| import java.util.BitSet; |
| |
| import static java.nio.ByteOrder.LITTLE_ENDIAN; |
| |
| public final class Utils { |
| |
| private Utils() { |
| throw new AssertionError("No instances of Utils"); |
| } |
| |
| private static final BigInteger TWO = BigInteger.valueOf(2); |
| |
| public static String readUntilNull(ByteBuffer buffer) { |
| StringBuilder sb = new StringBuilder(buffer.remaining()); |
| while(buffer.hasRemaining()) { |
| byte b = buffer.get(); |
| if(b == H5Constants.NULL) { |
| return sb.toString(); |
| } |
| sb.append((char) b); |
| } |
| throw new IllegalArgumentException("End of buffer reached before NULL"); |
| } |
| |
| public static void seekBufferToNextMultipleOfEight(ByteBuffer bb) { |
| int pos = bb.position(); |
| if(pos % 8 == 0) { |
| return; // Already on a 8 byte multiple |
| } |
| bb.position(pos + (8 - (pos % 8))); |
| } |
| |
| public static int readBytesAsUnsignedInt(ByteBuffer buffer, int length) { |
| switch(length) { |
| case 1: |
| return Byte.toUnsignedInt(buffer.get()); |
| case 2: |
| return Short.toUnsignedInt(buffer.getShort()); |
| case 3: |
| return readArbitraryLengthBytesAsUnsignedInt(buffer, length); |
| case 4: |
| int value = buffer.getInt(); |
| if(value < 0) { |
| throw new ArithmeticException("Could not convert to unsigned"); |
| } |
| return value; |
| case 5: |
| case 6: |
| case 7: |
| return readArbitraryLengthBytesAsUnsignedInt(buffer, length); |
| case 8: |
| // Throws if the long can't be converted safely |
| return Math.toIntExact(buffer.getLong()); |
| default: |
| throw new IllegalArgumentException("Couldn't read " + length + " bytes as int"); |
| } |
| } |
| |
| private static int readArbitraryLengthBytesAsUnsignedInt(ByteBuffer buffer, int length) { |
| byte[] bytes = new byte[length]; |
| buffer.get(bytes); |
| if(buffer.order() == LITTLE_ENDIAN) { |
| ArrayUtils.reverse(bytes); |
| } |
| return new BigInteger(1, bytes).intValueExact(); |
| } |
| |
| public static long readBytesAsUnsignedLong(ByteBuffer buffer, int length) { |
| switch(length) { |
| case 1: |
| return Byte.toUnsignedLong(buffer.get()); |
| case 2: |
| return Short.toUnsignedLong(buffer.getShort()); |
| case 3: |
| return readArbitraryLengthBytesAsUnsignedLong(buffer, length); |
| case 4: |
| return Integer.toUnsignedLong(buffer.getInt()); |
| case 5: |
| case 6: |
| case 7: |
| return readArbitraryLengthBytesAsUnsignedLong(buffer, length); |
| case 8: |
| long value = buffer.getLong(); |
| if(value < 0 && value != H5Constants.UNDEFINED_ADDRESS) { |
| throw new ArithmeticException("Could not convert to unsigned"); |
| } |
| return value; |
| default: |
| throw new IllegalArgumentException("Couldn't read " + length + " bytes as int"); |
| } |
| } |
| |
| private static long readArbitraryLengthBytesAsUnsignedLong(ByteBuffer buffer, int length) { |
| byte[] bytes = new byte[length]; |
| buffer.get(bytes); |
| if(buffer.order() == LITTLE_ENDIAN) { |
| ArrayUtils.reverse(bytes); |
| } |
| return new BigInteger(1, bytes).longValueExact(); |
| } |
| |
| public static ByteBuffer createSubBuffer(ByteBuffer source, int length) { |
| ByteBuffer headerData = source.slice(); |
| headerData.limit(length); |
| headerData.order(source.order()); |
| |
| source.position(source.position() + length); |
| return headerData; |
| } |
| |
| public static int bitsToInt(BitSet bits, int start, int length) { |
| if(length <= 0) { |
| throw new IllegalArgumentException("length must be >0"); |
| } |
| BigInteger result = BigInteger.ZERO; |
| for(int i = 0; i < length; i++) { |
| if(bits.get(start + i)) { |
| result = result.add(TWO.pow(i)); |
| } |
| } |
| return result.intValue(); |
| } |
| |
| } |