145 lines
3.6 KiB
Java
145 lines
3.6 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.util;
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import java.io.FilterInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* Wraps an {@link InputStream} providing {@link LittleEndianInput}<p/>
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*
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* This class does not buffer any input, so the stream read position maintained
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* by this class is consistent with that of the inner stream.
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*
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* @author Josh Micich
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*/
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public class LittleEndianInputStream extends FilterInputStream implements LittleEndianInput {
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public LittleEndianInputStream(InputStream is) {
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super(is);
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}
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public int available() {
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try {
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return super.available();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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public byte readByte() {
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return (byte)readUByte();
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}
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public int readUByte() {
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int ch;
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try {
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ch = in.read();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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checkEOF(ch);
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return ch;
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}
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public double readDouble() {
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return Double.longBitsToDouble(readLong());
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}
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public int readInt() {
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int ch1;
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int ch2;
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int ch3;
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int ch4;
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try {
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ch1 = in.read();
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ch2 = in.read();
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ch3 = in.read();
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ch4 = in.read();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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checkEOF(ch1 | ch2 | ch3 | ch4);
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return (ch4 << 24) + (ch3 << 16) + (ch2 << 8) + (ch1 << 0);
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}
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public long readLong() {
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int b0;
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int b1;
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int b2;
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int b3;
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int b4;
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int b5;
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int b6;
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int b7;
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try {
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b0 = in.read();
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b1 = in.read();
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b2 = in.read();
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b3 = in.read();
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b4 = in.read();
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b5 = in.read();
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b6 = in.read();
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b7 = in.read();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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checkEOF(b0 | b1 | b2 | b3 | b4 | b5 | b6 | b7);
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return (((long)b7 << 56) +
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((long)b6 << 48) +
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((long)b5 << 40) +
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((long)b4 << 32) +
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((long)b3 << 24) +
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(b2 << 16) +
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(b1 << 8) +
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(b0 << 0));
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}
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public short readShort() {
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return (short)readUShort();
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}
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public int readUShort() {
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int ch1;
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int ch2;
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try {
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ch1 = in.read();
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ch2 = in.read();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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checkEOF(ch1 | ch2);
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return (ch2 << 8) + (ch1 << 0);
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}
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private static void checkEOF(int value) {
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if (value <0) {
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throw new RuntimeException("Unexpected end-of-file");
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}
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}
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public void readFully(byte[] buf) {
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readFully(buf, 0, buf.length);
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}
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public void readFully(byte[] buf, int off, int len) {
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int max = off+len;
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for(int i=off; i<max; i++) {
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int ch;
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try {
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ch = in.read();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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checkEOF(ch);
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buf[i] = (byte) ch;
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}
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}
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}
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