122 lines
3.5 KiB
Java
122 lines
3.5 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.OutputStream;
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/**
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* Adapts a plain byte array to {@link LittleEndianOutput}
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*/
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public final class LittleEndianByteArrayOutputStream extends OutputStream implements LittleEndianOutput, DelayableLittleEndianOutput {
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private final byte[] _buf;
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private final int _endIndex;
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private int _writeIndex;
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public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset, int maxWriteLen) { // NOSONAR
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if (startOffset < 0 || startOffset > buf.length) {
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throw new IllegalArgumentException("Specified startOffset (" + startOffset
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+ ") is out of allowable range (0.." + buf.length + ")");
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}
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_buf = buf;
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_writeIndex = startOffset;
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_endIndex = startOffset + maxWriteLen;
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if (_endIndex < startOffset || _endIndex > buf.length) {
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throw new IllegalArgumentException("calculated end index (" + _endIndex
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+ ") is out of allowable range (" + _writeIndex + ".." + buf.length + ")");
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}
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}
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public LittleEndianByteArrayOutputStream(byte[] buf, int startOffset) {
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this(buf, startOffset, buf.length - startOffset);
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}
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private void checkPosition(int i) {
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if (i > _endIndex - _writeIndex) {
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throw new RuntimeException("Buffer overrun");
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}
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}
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@Override
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public void writeByte(int v) {
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checkPosition(1);
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_buf[_writeIndex++] = (byte)v;
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}
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@Override
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public void writeDouble(double v) {
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writeLong(Double.doubleToLongBits(v));
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}
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@Override
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public void writeInt(int v) {
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checkPosition(4);
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int i = _writeIndex;
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_buf[i++] = (byte)((v >>> 0) & 0xFF);
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_buf[i++] = (byte)((v >>> 8) & 0xFF);
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_buf[i++] = (byte)((v >>> 16) & 0xFF);
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_buf[i++] = (byte)((v >>> 24) & 0xFF);
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_writeIndex = i;
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}
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@Override
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public void writeLong(long v) {
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writeInt((int)(v >> 0));
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writeInt((int)(v >> 32));
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}
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@Override
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public void writeShort(int v) {
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checkPosition(2);
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int i = _writeIndex;
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_buf[i++] = (byte)((v >>> 0) & 0xFF);
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_buf[i++] = (byte)((v >>> 8) & 0xFF);
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_writeIndex = i;
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}
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@Override
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public void write(int b) {
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writeByte(b);
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}
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@Override
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public void write(byte[] b) {
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int len = b.length;
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checkPosition(len);
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System.arraycopy(b, 0, _buf, _writeIndex, len);
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_writeIndex += len;
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}
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@Override
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public void write(byte[] b, int offset, int len) {
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checkPosition(len);
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System.arraycopy(b, offset, _buf, _writeIndex, len);
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_writeIndex += len;
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}
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public int getWriteIndex() {
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return _writeIndex;
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}
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@Override
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public LittleEndianOutput createDelayedOutput(int size) {
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checkPosition(size);
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LittleEndianOutput result = new LittleEndianByteArrayOutputStream(_buf, _writeIndex, size);
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_writeIndex += size;
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return result;
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}
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}
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