83 lines
2.2 KiB
Java
83 lines
2.2 KiB
Java
/*
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* Copyright (C) 2010 Ken Ellinwood
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 kellinwood.zipio;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.zip.CRC32;
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import java.util.zip.Deflater;
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import java.util.zip.DeflaterOutputStream;
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public class ZioEntryOutputStream extends OutputStream {
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int size = 0; // tracks uncompressed size of data
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CRC32 crc = new CRC32();
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int crcValue = 0;
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OutputStream wrapped;
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OutputStream downstream;
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public ZioEntryOutputStream( int compression, OutputStream wrapped)
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{
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this.wrapped = wrapped;
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if (compression != 0)
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downstream = new DeflaterOutputStream( wrapped, new Deflater( Deflater.BEST_COMPRESSION, true));
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else downstream = wrapped;
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}
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public void close() throws IOException {
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downstream.flush();
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downstream.close();
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crcValue = (int)crc.getValue();
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}
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public int getCRC() {
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return crcValue;
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}
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public void flush() throws IOException {
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downstream.flush();
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}
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public void write(byte[] b) throws IOException {
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downstream.write(b);
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crc.update(b);
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size += b.length;
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}
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public void write(byte[] b, int off, int len) throws IOException {
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downstream.write( b, off, len);
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crc.update( b, off, len);
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size += len;
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}
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public void write(int b) throws IOException {
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downstream.write( b);
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crc.update( b);
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size += 1;
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}
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public int getSize() {
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return size;
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}
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public OutputStream getWrappedStream()
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{
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return wrapped;
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}
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}
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